US20090039011A1 - Fuel-filtering device - Google Patents
Fuel-filtering device Download PDFInfo
- Publication number
- US20090039011A1 US20090039011A1 US12/232,918 US23291808A US2009039011A1 US 20090039011 A1 US20090039011 A1 US 20090039011A1 US 23291808 A US23291808 A US 23291808A US 2009039011 A1 US2009039011 A1 US 2009039011A1
- Authority
- US
- United States
- Prior art keywords
- filter
- fuel
- filter layer
- filtering device
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000001914 filtration Methods 0.000 title claims abstract description 87
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 52
- 239000000835 fiber Substances 0.000 claims abstract description 45
- -1 polyethylene Polymers 0.000 claims abstract description 30
- 239000004743 Polypropylene Substances 0.000 claims abstract description 21
- 229920001155 polypropylene Polymers 0.000 claims abstract description 21
- 238000004891 communication Methods 0.000 claims abstract description 14
- 238000003466 welding Methods 0.000 claims abstract description 14
- 239000004698 Polyethylene Substances 0.000 claims abstract description 9
- 229920000573 polyethylene Polymers 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 97
- 239000000446 fuel Substances 0.000 claims description 69
- 239000002828 fuel tank Substances 0.000 claims description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 239000004744 fabric Substances 0.000 claims description 14
- 238000000465 moulding Methods 0.000 claims description 12
- 239000004033 plastic Substances 0.000 claims description 12
- 229920003023 plastic Polymers 0.000 claims description 12
- 238000000926 separation method Methods 0.000 claims description 9
- 239000004750 melt-blown nonwoven Substances 0.000 claims description 8
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 229920002994 synthetic fiber Polymers 0.000 description 18
- 239000012209 synthetic fiber Substances 0.000 description 18
- 238000002485 combustion reaction Methods 0.000 description 11
- 238000003780 insertion Methods 0.000 description 7
- 230000037431 insertion Effects 0.000 description 7
- 229920001778 nylon Polymers 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 229920003002 synthetic resin Polymers 0.000 description 6
- 239000000057 synthetic resin Substances 0.000 description 6
- 230000010354 integration Effects 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 239000000155 melt Substances 0.000 description 3
- 240000007643 Phytolacca americana Species 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 230000002522 swelling effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
- B01D35/027—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks rigidly mounted in or on tanks or reservoirs
- B01D35/0273—Filtering elements with a horizontal or inclined rotation or symmetry axis submerged in tanks or reservoirs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
- F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
- F02M37/50—Filters arranged in or on fuel tanks
Definitions
- the present invention relates to a fuel-filtering device attached to a fuel suction port located in a fuel tank.
- a fuel pump transfers fuel in a fuel tank to an internal combustion engine via a suction pipe provided inside the fuel tank.
- a filter is attached to a fuel suction port of the suction pipe.
- the filter is formed in a bag shape, and has an outer layer made of an extruded mesh and an inner layer made of a non-woven fabric. Also, a spacing member is provided inside the filter for maintaining an inflated bag shape of the filter.
- water can be separated by the outer layer to a certain degree, and the inner layer can remove the foreign materials, such as dust, fiber pieces, peeled plating pieces, and solder grounds.
- a lower section of the filter contacts an inner surface at a lower section of a fuel tank. Therefore, when the fuel tank expands due to a change in an internal pressure, the spacing member is pressed and moved. When the spacing member is moved, the spacing member slides and contacts the inner layer.
- the inner layer tends to be worn out with time. Also, small pieces may be fallen off from the filter due to the sliding contact, and these pieces may be sent to the internal combustion engine from the fuel suction port.
- an object of the invention is to provide a fuel-filtering device with improved water separation efficiency.
- Another object of the invention is to provide a fuel-filtering device with a spacing member for maintaining an inflated bag shape, and small pieces fallen off from the filter due to the sliding contact between the spacing member and the fuel tank are eliminated.
- the first aspect of the invention provides a fuel-filtering device including a filter body formed in a bag shape.
- the fuel-filtering device is attached to a fuel suction port inside a fuel tank such that an inner space of the filter body communicates with the fuel suction port.
- the filter body is formed of two or more laminated filter layers.
- the first filter layer constituting an outer surface of the filter body is formed of a woven mesh, and has a function of water separation.
- the second filter layer is formed of a non-woven fabric, and disposed adjacent to the woven mesh at an inner side of the woven mesh.
- the first filter layer is formed of the woven mesh having a fine mesh for improved water separation, water is separated more effectively in the inner space of the filter body as compared with an extruded mesh made of a synthetic resin.
- the second filter layer which is formed of the non-woven fabric and disposed just inside the first filter layer. Accordingly, since the number of foreign materials sent in the fuel pump is decreased, the fuel pump has a prolonged life.
- a fuel-filtering device is formed of a filter body in a bag shape and a spacing member arranged in the filter body to maintain an inflated bag form.
- the fuel-filtering device is attached to the fuel suction port such that an inner space of the filter body communicates with the fuel suction port.
- the filter body includes an upper surface section and a lower surface section, and at least the lower surface section of the filter body includes an inner layer formed of a mesh and an outer layer formed of a non-woven fabric.
- the spacing member even if the spacing member is pressed and moved when the inner wall surface of the lower section of the fuel tank moves (that is, expansion and shrinking of the fuel tank) due to a change in an internal pressure of the fuel tank, the spacing member does not make direct sliding contact with the outer layer.
- the outer layer is not worn out with time, and fibers are not fallen off from the non-woven fabric. Accordingly, the fibers from the non-woven fabric are not sent to the internal combustion engine from the fuel suction port.
- a fuel-filtering device is formed of a filter body in a bag form, and a spacing member arranged in the filter body to maintain an inflated bag form.
- the filter body includes an upper surface section and a lower surface section, and at least lower surface section of the filter body includes an inner layer formed of a mesh or mesh member, an outer layer formed of a mesh or mesh member, and an intermediate layer formed of a non-woven fabric.
- the spacing member even if the spacing member is pressed and moved when the inner wall surface of the lower section of the fuel tank moves (that is, expansion and shrinking of the fuel tank) due to a change in an internal pressure of the fuel tank, the spacing member does not make direct sliding contact with the outer layer.
- the outer layer is not worn out with time, and fibers are not fallen off from the non-woven fabric. Accordingly, the fibers from the non-woven fabric are not sent to the internal combustion engine side from the fuel suction port.
- the shape of the non-woven fabric constituting the intermediate layer can be maintained by the outer layer and the inner layer, so that the filter body is maintained in an adequately inflated bag form.
- the fuel-filtering device may further include a cylindrical socket body having two end portions. One end portion of the cylindrical socket body is connected to the fuel suction port, and the other end portion of the cylindrical socket body is connected to a communication hole formed in the filter body.
- the filtering device by connecting one end portion of the cylindrical socket body to the fuel suction port, the filtering device can be adequately attached to the fuel suction port.
- the fuel filtering-device according to the second aspect of the invention may further include a plastic contact section, which is integrally formed at an outer surface of the lower section of the filter body and contacts the inner wall surface of the lower section of the fuel tank.
- the outer layer constituting the filter body is prevented from directly contacting the inner wall surface of the lower section of the fuel tank. Therefore, the outer layer will not be worn out with time since the inner wall surface of the lower section of the fuel tank does not slide against the outer layer when the inner wall surface of the lower section of the fuel tank moves (that is, when the fuel tank T is expanded or shrunk) due to the change in the internal pressure of the fuel tank.
- the bag-shaped filter body of the fuel-filtering device of the second aspect of the invention may be formed of two filter base materials including the mesh constituting the inner layer and the non-woven fabric constituting the outer layer, respectively.
- the bag-shaped filter body is formed by connecting rim portions of the filter base materials.
- the filter body may be formed by folding the filter base material in half, in which the rim portions of the folded filter material face each other at portions other than the folded side, and are connected to each other to thereby make the filter body in the bag form.
- the fuel-filtering device of the sixth aspect of the invention further includes a plastic cylindrical socket body, which has one end portion connected to the fuel suction port and the other end portion connected to the communication hole formed in the filter body.
- the cylindrical socket body is formed by insert molding by inserting the filter base material before connecting the rim portions as described above.
- the filter base material and the cylindrical socket body are securely connected, in other words, the filter body formed of the filter base material and the cylindrical socket body are securely connected.
- the filtering device of the sixth aspect of the invention may further include a plastic contact section formed at the outer surface of the lower section of the filter body.
- the plastic contact section contacts the inner wall surface of the lower section of the fuel tank.
- the contact section is formed by insert molding by inserting the filter base material before connecting the rim portions.
- the filter base material and the plastic contact section are securely connected, in other words, the filter body formed of the filter base material and the contact section are securely connected.
- the filter body in the filtering device according to the second aspect of the invention, may be formed by connecting the rim portions of the folded filter base material or two base materials as in the sixth aspect of the invention, wherein the mesh constituting the inner layer and the non-woven fabric constituting the outer layer include the same type of synthetic fibers.
- the outer layer and the inner layer can be securely integrated at the rim portions connected by welding.
- the bag-shaped filter body of the filtering device of the third aspect of the invention may be formed of two filter base materials including the mesh constituting the inner layer, the mesh constituting the outer layer, and the non-woven fabric constituting the intermediate layer.
- the bag-shaped filter body is formed by connecting rim portions of the filter base materials.
- the filter body may be formed by folding the filter base material in half, in which the rim portions of the folded filter material face each other at portions other than the folded side, and are connected to each other to thereby form the filter body in the bag form.
- the fuel-filtering device further includes a plastic cylindrical socket body, which has one end portion connected to the fuel suction port and the other end portion connected to the communication hole formed in the filter body.
- the cylindrical socket body is formed by insert molding by inserting the filter base material before connecting the rim portions as described above.
- the filter base material and the cylindrical socket body are securely connected, in other words, the integration of the filter body formed of the filter base material and the cylindrical socket body are securely connected.
- the filter body of the filtering device of the third aspect of the invention may be formed by connecting the rim portions of the folded filter base material or two filter base materials as in the ninth aspect of the invention, and the filtering device further may include a plastic contact section integrally formed at the outer surface of the lower section of the filter body.
- the plastic contact section is formed by insert molding by inserting the filter base material before connecting the rim portions.
- the filter base material and the contact section are securely connected, in other words, the integration of the filter body formed of the filter base material and the contact section are securely connected.
- the filter body of the filtering device of the third aspect of the invention may be formed by connecting the rim portions of the folded filter base material or two filter base materials as in the ninth aspect of the invention, and the mesh constituting the inner layer, the mesh constituting the outer layer and the non-woven fabric constituting the intermediate layer include the same type of synthetic fibers.
- the outer layer, the inner layer, and the intermediate layer can be securely integrated at the rim portions connected by welding.
- FIG. 1 is a plan view of a filtering device according to the first embodiment of the invention
- FIG. 2 is a sectional view of the filtering device taken along line 2 - 2 in FIG. 1 in a state that the filtering device is in use;
- FIG. 3 is a side view of the filtering device
- FIG. 4A is an enlarged sectional view of a filter body
- FIG. 4B is an enlarged sectional view of another filter body
- FIG. 4C is an enlarged sectional view of a further filter body
- FIG. 5 is a top plan view of a cylindrical socket body
- FIG. 6 is a side view of the cylindrical socket body
- FIG. 7 is a sectional view taken along line 7 - 7 in FIG. 5 ;
- FIG. 8 is a top plan view of a spacing member
- FIG. 9 is a sectional view of the spacing member
- FIG. 10 is a bottom plan view of the spacing member
- FIG. 11 is a developed view showing a filter base material
- FIG. 12 is a plan view of a filtering device according to the second embodiment of the invention.
- FIG. 13 is a sectional view of the filtering device taken along line 13 - 13 in FIG. 12 in a state that the filtering device is in use;
- FIG. 14 is a side view of the filtering device of the second embodiment of the invention.
- FIG. 15 is an enlarged sectional view of a filter body in the filtering device of the second embodiment.
- FIG. 1 to FIG. 11 show a filtering device F according to the first embodiment of the invention
- FIG. 12 to FIG. 15 show a filtering device F′ according to the second embodiment of the invention.
- FIG. 1 shows the filtering device F according to the first embodiment of the invention seen from above, and FIG. 2 shows a state that the filtering device F is in use, in which the filtering device F is shown in a sectional view.
- FIG. 3 shows the filtering device F seen from a right side in FIG. 2 .
- FIG. 4A shows an enlarged sectional view of a filter body 1 of the filtering device F
- FIG. 4B shows an enlarged sectional structure of another example of the filter body of the filtering device F.
- FIG. 5 to FIG. 7 show a cylindrical socket body 4 forming the filtering device F
- FIG. 8 to FIG. 10 show a spacing member 6 .
- FIG. 1 shows the filtering device F according to the first embodiment of the invention seen from above
- FIG. 2 shows a state that the filtering device F is in use, in which the filtering device F is shown in a sectional view.
- FIG. 3 shows the filtering device F seen from a right side in FIG. 2 .
- FIG. 11 shows a filter base material 2 , which is shown in a developed view to explain an insert-molding method where the developed base material 2 is placed in a metallic mold to mold the cylindrical socket body 4 and a contact section 5 .
- the cylindrical socket member 4 and the contact section 5 are placed in a mold at positions shown by phantom lines tracing contours of the respective members.
- a projected line in FIG. 11 indicates a folding line of the filter base material 2 for forming the filter body 1 in a bag shape from the filter base material 2 after the insert molding described above.
- FIG. 12 shows the filtering device F′ according to the second embodiment of the invention seen from above
- FIG. 13 is a sectional view of the filtering device F′ in a state that the filtering device F′ is in use.
- FIG. 14 shows the filtering device F′ seen from a right side in FIG. 13 .
- FIG. 15 shows an enlarged sectional structure of a filter body 1 of the filtering device F′.
- the filtering device F according to the first embodiment of the invention is attached to a fuel suction port Ha disposed inside a fuel tank T, to thereby remove water and foreign materials in fuel transferred to an internal combustion engine through the fuel suction port Ha.
- the filtering device F is attached to the fuel suction port Ha of a suction pipe H inside the fuel tank T.
- the fuel is transferred to the internal combustion engine side through the fuel suction port Ha by a fuel pump P disposed inside the fuel tank T, or by a fuel pump disposed outside the fuel tank T.
- the filtering device F includes the fuel body 1 formed in a bag shape.
- the filtering device F is attached to the fuel suction port Ha such that an inner space 10 of the bag shape fuel body 1 communicates with the fuel suction port Ha.
- the filtering device F includes the spacing member 6 , which is arranged inside the filter body 1 to keep the filter body 1 in an inflated bag shape.
- the filter body 1 includes an upper surface section 13 and a lower surface section 14 , and at least the lower surface section 14 of the filter body 1 includes an inner layer 3 a formed of a mesh or mesh member, and an outer layer 3 b formed of a non-woven fabric as shown in FIG. 4A .
- the mesh forming the inner layer 3 a can be formed of an extruded mesh or a woven mesh.
- the mesh is formed of a woven mesh
- a synthetic fiber such as a nylon fiber, a polyethylene fiber, or a polypropylene fiber
- the woven mesh can be formed by a weave for forming Japanese Tatami mat, a plain weave, a twill weave, or a satin weave.
- the non-woven fabric forming the outer layer 3 b is structured to efficiently remove the foreign materials in the fuel.
- the non-woven fabric is formed of a synthetic fiber, such as a nylon fiber, a polyethylene fiber, or a polypropylene fiber, and is formed of a mat or a sheet through various methods, such as a span bond and a melt blown.
- both the mesh and the non-woven fabric are formed of the synthetic fiber.
- each of the upper surface section 13 and the lower surface section 14 includes the inner layer 3 a formed of the mesh and the outer layer 3 b formed of the non-woven fabric.
- a sheet of the filter base material 2 including the inner layer 3 a and the outer layer 3 b is folded in half such that the inner layer 3 a is located inside.
- rim portions 20 of the filter base material 2 which face each other at portions other than the folded side of the filter base material 2 , are bonded to each other to thereby form the filter body 1 in the bag shape.
- an ultrasonic welding or a vibration welding is used to bond the rim portions 20 of the filter base material 2 .
- the inner layer 3 a and the outer layer 3 b respectively may include fibers formed of the same synthetic resin, so that both the layers 3 a , 3 b can be bonded together at the welded portions by the aforementioned welding method.
- the inner layer 3 a and the outer layer 3 b may be spot-welded at portions other than the rim portions 20 of the filter base material 2 as described above. Accordingly, an unnecessary space between the layers 3 a and 3 b is eliminated.
- two sheets of the filter base materials 2 which include the inner layer 3 a and the outer layer 3 b , may be bonded at the rim portions 20 to form the bag shape filter body 1 .
- the spacing member 6 does not directly contact the outer layer 3 b formed of the non-woven fabric.
- each of the upper surface section 13 and the lower surface section 14 has the inner layer 3 a formed of the mesh and the outer layer 3 b formed of the non-woven fabric. Therefore, the spacing member 6 does not directly contact the outer layer 3 b at both the lower and upper sides of the filter body 1 .
- the outer layer 3 b formed of the non-woven fabric effectively removes the foreign materials in the fuel. Accordingly, the number of the foreign materials sent into the fuel pump P is reduced, so that the life of the fuel pump P can be prolonged.
- the filter body may be formed of two or more laminated filter layers 3 .
- a filter body 1 ′ is formed of a filter base material 2 ′ formed of the two or more filter layers 3 in a bag shape.
- the filter layer 3 (hereinafter referred to as the first filter layer 30 ) forming an outer surface 11 of the filter body 1 ′ can be formed of a woven mesh or woven mesh material with water separation function, and the filter layer 3 (hereinafter referred to as a second filter layer 31 ) adjacent to the first filter layer 30 at an inner side of the first filter layer 30 can be formed of the non-woven fabric.
- the woven mesh forming the first filter layer 30 has a mesh fine enough for the water separation, and formed by a weave for forming a Tatami mat, a plain weave, a twill weave, a satin weave, and the like.
- the woven mesh is typically formed of a synthetic fiber, such as a nylon fiber, a polyethylene fiber, or a polypropylene fiber, i.e. at least one of a nylon fiber, a polyethylene fiber and a polypropylene fiber, and has a mesh fine enough for the water separation.
- the non-woven fabric forming the second filter layer 31 is structured to efficiently remove the foreign materials in the fuel.
- the non-woven fabric is formed of a synthetic fiber, such as a nylon fiber, a polyethylene fiber, or a polypropylene fiber.
- the fabric is formed of a mat or a sheet through various methods, such as a span bond and a melt blown.
- both the woven mesh and the non-woven fabric are formed of the synthetic fiber.
- a sheet of the filter base material 2 ′ which has the first filter layer 30 and the second filter layer 31 , is folded in half such that the second filter layer 31 is located inside.
- rim portions 20 of the filter base material 2 ′ which face each other at portions other than the folded side of the filter base material 2 ′, are bonded together to thereby form the filter body 1 ′ in the bag shape.
- the rim portions 20 of the filter base material 2 ′ are bonded by an ultrasonic welding or a vibration welding.
- the synthetic fibers forming the first filter layer 30 and the synthetic fibers forming the second filter layer 31 may be formed of the same type of synthetic resin, so that the filter layers 30 , 31 can be bonded together at the welded portions by the aforementioned welding.
- the first filter layer 30 and the second filter layer 31 may be spot-welded at portions other than the rim portions 20 of the filter base material 2 ′ as described above. Accordingly, an unnecessary space between the filter layers 30 , 31 is eliminated.
- two sheets of the filter base materials 2 ′ which include the first filter layer 30 and the second filter layer 31 , may be bonded together to form the filter body 1 in the bag form.
- the third filter layer 32 formed of a non-woven fabric is provided at an inner side of the second filter layer 31 , and the third filter layer 32 is also able to remove the foreign materials in the fuel.
- the first filter layer 30 is formed of the woven mesh with a mesh fine enough for separating water.
- the first filter layer 30 is formed of the extruded mesh made of the synthetic resin, water is much more securely prevented from entering into the inner space 10 of the filter body.
- the second filter layer 31 which is formed of the non-woven fabric adjacent to the first filter layer 30 at the inner side of the first filter layer 30 , can remove the foreign materials in the fuel, which have passed through the first filter 30 . Therefore, the number of the foreign materials into the fuel pump P is reduced, so that the life of the fuel pump P can be prolonged.
- a filter base material 2 ′′ is formed of three or more filter layers in a bag shape.
- the filter base material 2 ′′ has an outside filter layer 30 ′ and an inside filter layer 32 ′ formed of a non-woven fabric. Additionally, the filter base material 2 ′′ has an intermediate filter layer formed of three intermediate filter layers 31 A to 31 C between the outside filter layer 30 ′ and the inside filter layer 32 ′.
- the outside filter layer 30 ′ is formed of a woven mesh cloth with about 70 mesh size small enough for separating water, and formed of a Tatami weave, a plain weave, a twill weave, a satin weave, and the like.
- the woven mesh cloth is typically formed of a synthetic fiber such as a polypropylene fiber with a diameter of about 180 ⁇ m, and has holes with an average diameter of 180 ⁇ m.
- the inside filter layer 32 ′ is formed of a span bond non-woven fabric with an area density of 80 g/m 2 .
- the span bond non-woven fabric is formed of a synthetic fiber such as a polypropylene fiber with a diameter of about 20 ⁇ m and has holes with an average diameter of 50 ⁇ m.
- the inside filter layer 32 ′ provides strength to the filter base material 2 ′ and protects the intermediate filter layer.
- the inside filter layer 32 ′ does not substantially provide a filtering property.
- the intermediate filter layer is formed of the three intermediate filter layers 31 A to 31 C.
- the intermediate filter layer 31 A is arranged adjacent to the outside filter layer 30 ′, and is formed of a melt blown non-woven fabric with an area density of 40 g/m 2 .
- the melt blown non-woven fabric of the intermediate filter layer 31 A is formed of a synthetic fiber such as a polypropylene fiber with a diameter of about 7 ⁇ m and has holes with an average diameter of 27 ⁇ m.
- the intermediate filter layer 31 B is arranged adjacent to the intermediate filter layer 31 A, and is formed of a melt blown non-woven fabric with an area density of 30 g/m 2 .
- the melt blown non-woven fabric of the intermediate filter layer 31 B is formed of a synthetic fiber such as a polypropylene fiber with a diameter of about 5 ⁇ m and has holes with an average diameter of 15.1 ⁇ m.
- the intermediate filter layer 31 C is arranged between the intermediate filter layer 31 B and the inside filter layer 32 ′, and is formed of a melt blown non-woven fabric with an area density of 40 g/m 2 .
- the melt blown non-woven fabric of the intermediate filter layer 31 C is formed of a synthetic fiber such as a polypropylene fiber with a diameter of about 3 ⁇ m and has holes with an average diameter of 7.1 ⁇ m.
- the filter base material 2 ′′ is formed of the outside filter layer 30 ′, the inside filter layer 32 ′, and the three intermediate filter layers 31 A to 31 C between the outside filter layer 30 ′ and the inside filter layer 32 ′. Accordingly, the outside filter layer 30 ′ provides wear resistance against a bottom surface of the fuel tank, and the inside filter layer 32 ′ protects the intermediate filter layer and provides sufficient weld strength. Further, the intermediate filter layers are formed such that the fiber diameters and the average diameters of the holes decrease toward the inside filter layer 32 ′, respectively. Accordingly, it is possible to effectively prevent clogging while maintaining sufficient filtering performance.
- the outside filter layer 30 ′, the inside filter layer 32 ′, and the intermediate filter layers are formed of polypropylene fibers. Accordingly, it is possible to obtain sufficient water separation and securely bond all of the filter layers together at a welded portion with welding.
- a polypropylene fiber has excellent swelling property relative to fuel, thereby making it easy to control and maintain mesh size.
- the filtering device F includes a cylindrical socket body 4 having an end portion 40 connected to the fuel suction port Ha and an end portion 41 connected to a communication hole 12 formed in the filter body 1 .
- the cylindrical socket body 4 is formed as a cylindrical body in which both the end portions 40 , 41 are opened.
- the cylindrical socket body 4 is integrally formed with the filter body 1 such that the cylindrical socket body 4 constitutes one end of the filter body 1 having a substantially rectangular shape in a plan view, and the other end portion 41 communicating with the communication hole 12 formed in the upper surface section 13 of the filter body 1 .
- the cylindrical socket body 4 includes an outer flange 42 around a cylindrical axis of the cylindrical socket body 4 at the other end portion 41 side.
- a portion between the outer flange 42 and an opening rim of the other end portion 41 of the cylindrical socket body 4 constitutes an insertion section 43 to be inserted into the communication hole 12 of the filter body 1 .
- the insertion section 43 is inserted inside the filter body 1 . Accordingly, the filtered fuel entering into the inner space 10 of the filter body 1 is guided to the fuel suction port Ha side.
- the filtering device F can be properly attached to the fuel suction port Ha.
- the filter body 1 is provided in an inclined form inside the fuel tank T such that the filter body 1 gradually approaches the fuel suction port Ha from the other end toward the one end thereof provided with the cylindrical socket body 4 , and the lower surface section 14 of the filter body 1 at the other end contacts the inner wall surface Ta of the lower section of the fuel tank T as shown in FIG. 2 .
- the cylindrical socket body 4 is molded by an insert molding, in which the filter base material 2 before connected to the rim portions is inserted. More specifically, when the cylindrical socket body 4 is formed by the insert molding, the insertion section 43 is located in the communication hole 12 in a state that the filter base material 2 provided with the communication hole 12 is disposed in a mold, and the flange surface of the outer flange 42 is located closely in contact with the outer surface of the outer layer 3 b of the filter base material 2 .
- the filter base material 2 and the cylindrical socket body 4 in other words, the integration of the filter body 1 formed of the filter base material 2 and the cylindrical socket body 4 can be securely connected.
- the outer surface 11 of the lower side of the filter body 1 integrally includes the plastic contact section 5 for contacting the inner wall surface Ta of the lower section of the fuel tank T.
- the contact section 5 is integrated with the filter body 1 at the lower surface section 14 of the other end side of the filter body 1 disposed in the inclined form inside the fuel tank T as described above.
- the contact section 5 has a substantially rectangular plate form elongated in a width direction of the filter body 1 . In a state that an upper surface 50 of the contact section 5 is closely in contact with the lower surface section 14 of the filter body 1 , the contact section 5 is integrally formed at the filter body 1 .
- the outer layer 3 b forming the filter body 1 does not directly contact the inner wall surface Ta of the lower section of the fuel tank T.
- the outer layer 3 b will not be worn out with time as the inner wall surface Ta of the lower section of the fuel tank T does not slides against the outer layer 3 b when the inner wall surface Ta of the lower section of the fuel tank T moves (that is, when the fuel tank T expands or shrinks) due to the change in the internal pressure of the fuel tank T.
- the contact section 5 is molded by the insert molding, in which the filter base material 2 before connected is inserted.
- the contact section 5 is formed by the insert molding such that a part of the contact section 5 is closely in contact with the outer surface of the outer layer 3 b of the filter base material 2 while the filter base material 2 provided with the communication hole 12 is disposed in the metallic mold.
- the filter base material 2 and the contact section 5 in other words, the integration of the filter body 1 formed of the filter base material 2 and the contact section 5 are surely connected.
- the spacing member 6 is formed of (1) a principal section 60 with a length extending substantially throughout a longitudinal length of the filter body 1 ; (2) a plurality of branch sections 61 crossing at the principal section 60 and integrally connected to the principal section 60 at the crossing points; (3) spacing bodies 62 , 63 respectively provided at a plurality of branch sections 61 and both ends of the principal section 60 ; and (4) a fitting section 64 to be fitted with the insertion section 43 of the cylindrical socket body 4 .
- the spacing body 62 provided at each branch section 61 includes a downward projecting portion 62 a projecting downwardly below each branch section 61 .
- each downward projecting portion 62 a is formed in a curved shape such that the projecting end of the downward projecting portion 62 a does not poke the inner surface of the filter body 1 .
- the respective branch sections 61 are formed such that positions of the projecting end surfaces of the downward projecting portions 62 a become gradually higher from a side where the contact section 5 is formed toward a side where the cylinder socket body 4 is formed.
- the spacing bodies 63 provided at the principal section 60 project downwardly from terminal ends of the principal section 60 , and are formed in a sleigh shape in which projecting ends 63 a are formed in curved shapes such that upper sides thereof constitute inner sides of the curve. Further, a terminal end of each spacing body 63 faces a central side of the principal section 60 .
- the fitting section 64 has a rib surrounding a hole rim of a hole 65 formed in the principal section 60 , in which the hole rim of the hole 65 is located at an upper surface side of the principal section 60 .
- the fitting section 64 is designed to be fitted to the insertion section 43 of the cylindrical socket body 4 inserted in the inner space 10 through the communication hole 12 .
- the hole 65 communicates with the inside of the cylinder socket body 4 as shown in FIG. 2 .
- the fitting section 43 is fitted to the insertion section 43 such that an upper surface of the spacing member 6 faces the inner layer 3 a of the filter base material 2 .
- the filter base material 2 is folded in half such that the inner layer 3 a is located inside.
- the rim portions 20 of the folded filter base material 2 which face each other at portions other than the folded side of the filter base material 2 , are bonded together, so that the spacing member 6 can be accommodated in the inner space 10 of the filter body 1 .
- the filtering device F′ according to the second embodiment of the invention is attached to a fuel suction port Ha disposed inside a fuel tank T, to thereby remove water and foreign materials in fuel transferred to an internal combustion engine through the fuel suction port Ha, as in the first embodiment.
- the filtering device F′ is attached to the fuel suction port Ha of a suction pipe H inside the fuel tank T.
- the fuel is transferred to the internal combustion engine side through the fuel suction port Ha by a fuel pump P disposed inside the fuel tank T, or by a fuel pump disposed outside the fuel tank T.
- the filtering device F′ includes the filter body 1 formed in a bag shape.
- the filtering device F′ is attached to the fuel suction port Ha such that an inner space 10 of the bag shape filter body 1 communicates with the fuel suction port Ha.
- the filtering device F′ includes the spacing member 6 , which is arranged inside the filter body 1 to keep the filter body 1 in an inflated bag shape.
- the filter body 1 includes the upper surface section 13 and the lower surface section 14 , and at least the lower surface section 14 of the filter body 1 includes an inner layer 3 a formed of mesh or mesh member, an outer layer 3 b formed of mesh or mesh member, and an intermediate layer 3 c formed of non-woven fabric as shown in FIG. 15 .
- the meshes forming the inner layer 3 a and the outer layer 3 b can be formed of an extruded mesh or a woven mesh.
- the mesh is formed of a woven mesh
- a synthetic fiber such as a nylon fiber, a polyethylene fiber, or a polypropylene fiber
- the woven mesh can be formed by a weave by forming Tatami, a plain weave, a twill weave, or a satin weave.
- the non-woven fabric forming the outer layer 3 b is structured to efficiently remove the foreign materials in the fuel.
- the non-woven fabric is formed of a synthetic fiber, such as a nylon fiber, a polyethylene fiber, or a polypropylene fiber, and is formed of a mat or a sheet through various methods, such as a span bond and a melt blown.
- both the mesh and the non-woven fabric are formed of the synthetic fibers.
- both the upper surface section 13 and the lower surface section 14 include the inner layer 3 a formed of the mesh, the outer layer 3 b formed of the mesh, and the intermediate layer 3 c formed of the non-woven fabric.
- a sheet of the filter base material 2 including the inner layer 3 a , the intermediate layer 3 c and the outer layer 3 b is folded in half such that the inner layer 3 a is located inside.
- rim portions 20 of the filter base material 2 which face each other at portions other than the folded side of the filter base material 2 , are bonded together to thereby form the filter body 1 in the bag shape.
- an ultrasonic welding or a vibration welding is used to bond the rim portions 20 of the filter base material 2 .
- the inner layer 3 a , the intermediate layer 3 c and the outer layer 3 b respectively may include fibers formed of the same synthetic resin, so that the layers 3 a , 3 c , 3 b can be bonded together at the welded portions by the aforementioned welding method.
- the inner layer 3 a , the intermediate layer 3 c and the outer layer 3 b may be spot-welded at portions other than the rim portions 20 of the filter base material 2 as described above. Accordingly, an unnecessary space between the layers 3 a , 3 c and 3 b is eliminated.
- two sheets of the filter base materials 2 which include the inner layer 3 a , the intermediate layer 3 c and the outer layer 3 b , may be bonded at the rim portions 20 to form the bag shape filter body 1 .
- both the upper surface section 13 and the lower surface section 14 has the inner layer 3 a formed of the mesh, the intermediate layer 3 b formed of the non-woven fabric and the outer layer 3 b formed of the mesh. Therefore, the spacing member 6 does not directly contact the intermediate layer 3 b at both the lower and upper sides of the filter body 1 .
- the intermediate layer 3 c formed of the non-woven fabric effectively removes the foreign materials in the fuel. Accordingly, the number of the foreign materials sent into the fuel pump P is reduced, so that the life of the fuel pump P can be prolonged.
- the intermediate layer 3 c formed of the non-woven fabric is sandwiched between the outer layer 3 b and the inner layer 3 c . Therefore, the outer layer 3 b and the inner layer 3 a maintain a shape of the non-woven fabric forming the intermediate layer 3 c , so that the filter body 1 maintains the adequately inflated bag shape.
- the filtering device F′ includes a cylindrical socket body 4 having an end portion 40 connected to the fuel suction port Ha and an end portion 41 connected to a communication hole 12 formed in the filter body 1 .
- the socket body 4 has the same structure and is formed with the filter body 1 , as explained in the first embodiment. Therefore, the explanation thereof is omitted.
- the first filter layer is formed of the woven mesh having a fine mesh for improved water separation, water is separated more effectively in the inner space of the filter body as compared with an extruded mesh made of a synthetic resin.
- the inner layer of the bag shape filter body is formed of the mesh, and the layer formed of the non-woven fabric is provided outside the inner layer. Therefore, even if the spacing member arranged inside the filter body to maintain the inflated bag shape is pressed and moved when the inner wall surface of the lower section of the fuel tank moves, since the spacing member does not directly contact the layer formed of the non-woven fabric, the non-woven fabric is not worn out, and the fibers forming the non-woven fabric are not frayed. Accordingly, no fabric piece produced by fraying the fibers forming the non-woven fabric is sent to the internal combustion engine side.
Abstract
A fuel-filtering device includes a filter body having a bag shape and a communication hole, and is formed of a plurality of laminated filter layers bonded at rim portions by welding. The laminated filter layers include an outside filter layer formed of a woven mesh, an inside filter layer formed of a non-woven fabric, and at least one intermediate filter layer disposed between the outside filter layer and the inside filter layer and formed of a non-woven fabric. The inside filter layer has an average aperture diameter larger than that of the intermediate filter layers. The filter body is formed of at least one of a polyethylene fiber and a polypropylene fiber. The inside filter layer protects the intermediate filter layer and enhances a weld strength at the rim portions.
Description
- This is a continuation application of Ser. No. 11/057,236 filed on Feb. 15, 2005, which is a continuation-in-part application of Ser. No. 10/190,601 filed on Jul. 9, 2002, now abandoned.
- The present invention relates to a fuel-filtering device attached to a fuel suction port located in a fuel tank.
- A fuel pump transfers fuel in a fuel tank to an internal combustion engine via a suction pipe provided inside the fuel tank. In order to remove water from the transferred fuel as well as to prevent foreign materials from being sent to the fuel pump, a filter is attached to a fuel suction port of the suction pipe.
- This type of filter has been disclosed in Japanese Patent Publication (KOKAI) No. 2000-246026. The filter is formed in a bag shape, and has an outer layer made of an extruded mesh and an inner layer made of a non-woven fabric. Also, a spacing member is provided inside the filter for maintaining an inflated bag shape of the filter.
- According to the filter described above, water can be separated by the outer layer to a certain degree, and the inner layer can remove the foreign materials, such as dust, fiber pieces, peeled plating pieces, and solder grounds.
- It is known that water can be separated more efficiently as a mesh of the filter becomes finer. However, in the conventional filter, there is a limit to make a mesh finer since the outer layer is made of the extruded mesh.
- Also, a lower section of the filter contacts an inner surface at a lower section of a fuel tank. Therefore, when the fuel tank expands due to a change in an internal pressure, the spacing member is pressed and moved. When the spacing member is moved, the spacing member slides and contacts the inner layer.
- In the conventional filter, the inner layer tends to be worn out with time. Also, small pieces may be fallen off from the filter due to the sliding contact, and these pieces may be sent to the internal combustion engine from the fuel suction port.
- Accordingly, an object of the invention is to provide a fuel-filtering device with improved water separation efficiency.
- Another object of the invention is to provide a fuel-filtering device with a spacing member for maintaining an inflated bag shape, and small pieces fallen off from the filter due to the sliding contact between the spacing member and the fuel tank are eliminated.
- Further objects and advantages of the invention will be apparent from the following description of the invention.
- To achieve the aforementioned objects, the first aspect of the invention provides a fuel-filtering device including a filter body formed in a bag shape. The fuel-filtering device is attached to a fuel suction port inside a fuel tank such that an inner space of the filter body communicates with the fuel suction port. The filter body is formed of two or more laminated filter layers. In the two or more laminated filter layers, the first filter layer constituting an outer surface of the filter body is formed of a woven mesh, and has a function of water separation. The second filter layer is formed of a non-woven fabric, and disposed adjacent to the woven mesh at an inner side of the woven mesh.
- According to the structure of the filtering device of the first aspect of the invention, since the first filter layer is formed of the woven mesh having a fine mesh for improved water separation, water is separated more effectively in the inner space of the filter body as compared with an extruded mesh made of a synthetic resin.
- Also, foreign materials in the fuel, which have passed through the first filter layer, can be effectively removed by the second filter layer, which is formed of the non-woven fabric and disposed just inside the first filter layer. Accordingly, since the number of foreign materials sent in the fuel pump is decreased, the fuel pump has a prolonged life.
- According to the second aspect of the invention, a fuel-filtering device is formed of a filter body in a bag shape and a spacing member arranged in the filter body to maintain an inflated bag form. The fuel-filtering device is attached to the fuel suction port such that an inner space of the filter body communicates with the fuel suction port. The filter body includes an upper surface section and a lower surface section, and at least the lower surface section of the filter body includes an inner layer formed of a mesh and an outer layer formed of a non-woven fabric.
- According to the structure of the filtering device of the second aspect of the invention, even if the spacing member is pressed and moved when the inner wall surface of the lower section of the fuel tank moves (that is, expansion and shrinking of the fuel tank) due to a change in an internal pressure of the fuel tank, the spacing member does not make direct sliding contact with the outer layer. Thus, the outer layer is not worn out with time, and fibers are not fallen off from the non-woven fabric. Accordingly, the fibers from the non-woven fabric are not sent to the internal combustion engine from the fuel suction port.
- According to the third aspect of the invention, a fuel-filtering device is formed of a filter body in a bag form, and a spacing member arranged in the filter body to maintain an inflated bag form. The filter body includes an upper surface section and a lower surface section, and at least lower surface section of the filter body includes an inner layer formed of a mesh or mesh member, an outer layer formed of a mesh or mesh member, and an intermediate layer formed of a non-woven fabric.
- According to the structure of the filtering device of the third aspect of the invention, even if the spacing member is pressed and moved when the inner wall surface of the lower section of the fuel tank moves (that is, expansion and shrinking of the fuel tank) due to a change in an internal pressure of the fuel tank, the spacing member does not make direct sliding contact with the outer layer. Thus, the outer layer is not worn out with time, and fibers are not fallen off from the non-woven fabric. Accordingly, the fibers from the non-woven fabric are not sent to the internal combustion engine side from the fuel suction port.
- Also, since the intermediate layer formed of the non-woven fabric is sandwiched between the outer layer and the inner layer formed of the mesh, the shape of the non-woven fabric constituting the intermediate layer can be maintained by the outer layer and the inner layer, so that the filter body is maintained in an adequately inflated bag form.
- Further, according to the fourth aspect of the invention, the fuel-filtering device according to the second aspect of the invention may further include a cylindrical socket body having two end portions. One end portion of the cylindrical socket body is connected to the fuel suction port, and the other end portion of the cylindrical socket body is connected to a communication hole formed in the filter body.
- According to the structure of the filtering device of the fourth aspect of the invention, by connecting one end portion of the cylindrical socket body to the fuel suction port, the filtering device can be adequately attached to the fuel suction port.
- Further, according to the fifth aspect of the invention, the fuel filtering-device according to the second aspect of the invention may further include a plastic contact section, which is integrally formed at an outer surface of the lower section of the filter body and contacts the inner wall surface of the lower section of the fuel tank.
- According to the structure of the fuel-filtering device of the fifth aspect of the invention, the outer layer constituting the filter body is prevented from directly contacting the inner wall surface of the lower section of the fuel tank. Therefore, the outer layer will not be worn out with time since the inner wall surface of the lower section of the fuel tank does not slide against the outer layer when the inner wall surface of the lower section of the fuel tank moves (that is, when the fuel tank T is expanded or shrunk) due to the change in the internal pressure of the fuel tank.
- According to the sixth aspect of the invention, the bag-shaped filter body of the fuel-filtering device of the second aspect of the invention may be formed of two filter base materials including the mesh constituting the inner layer and the non-woven fabric constituting the outer layer, respectively. The bag-shaped filter body is formed by connecting rim portions of the filter base materials. Alternatively, the filter body may be formed by folding the filter base material in half, in which the rim portions of the folded filter material face each other at portions other than the folded side, and are connected to each other to thereby make the filter body in the bag form. Then, the fuel-filtering device of the sixth aspect of the invention further includes a plastic cylindrical socket body, which has one end portion connected to the fuel suction port and the other end portion connected to the communication hole formed in the filter body. The cylindrical socket body is formed by insert molding by inserting the filter base material before connecting the rim portions as described above.
- According to the structure of the filtering device of the sixth aspect of the invention, the filter base material and the cylindrical socket body are securely connected, in other words, the filter body formed of the filter base material and the cylindrical socket body are securely connected.
- According to the seventh aspect of the invention, the filtering device of the sixth aspect of the invention may further include a plastic contact section formed at the outer surface of the lower section of the filter body. The plastic contact section contacts the inner wall surface of the lower section of the fuel tank. The contact section is formed by insert molding by inserting the filter base material before connecting the rim portions.
- According to the structure of the filtering device of the seventh aspect of the invention, the filter base material and the plastic contact section are securely connected, in other words, the filter body formed of the filter base material and the contact section are securely connected.
- According to the eighth aspect of the invention, in the filtering device according to the second aspect of the invention, the filter body may be formed by connecting the rim portions of the folded filter base material or two base materials as in the sixth aspect of the invention, wherein the mesh constituting the inner layer and the non-woven fabric constituting the outer layer include the same type of synthetic fibers.
- According to the structure of the filtering device of the eighth aspect of the invention, the outer layer and the inner layer can be securely integrated at the rim portions connected by welding.
- According to the ninth aspect of the invention, the bag-shaped filter body of the filtering device of the third aspect of the invention may be formed of two filter base materials including the mesh constituting the inner layer, the mesh constituting the outer layer, and the non-woven fabric constituting the intermediate layer. The bag-shaped filter body is formed by connecting rim portions of the filter base materials. Alternatively, the filter body may be formed by folding the filter base material in half, in which the rim portions of the folded filter material face each other at portions other than the folded side, and are connected to each other to thereby form the filter body in the bag form. The fuel-filtering device further includes a plastic cylindrical socket body, which has one end portion connected to the fuel suction port and the other end portion connected to the communication hole formed in the filter body. The cylindrical socket body is formed by insert molding by inserting the filter base material before connecting the rim portions as described above.
- According to the structure of the filtering device of the ninth aspect of the invention, the filter base material and the cylindrical socket body are securely connected, in other words, the integration of the filter body formed of the filter base material and the cylindrical socket body are securely connected.
- Further, according to the tenth aspect of the invention, the filter body of the filtering device of the third aspect of the invention may be formed by connecting the rim portions of the folded filter base material or two filter base materials as in the ninth aspect of the invention, and the filtering device further may include a plastic contact section integrally formed at the outer surface of the lower section of the filter body. The plastic contact section is formed by insert molding by inserting the filter base material before connecting the rim portions.
- According to the structure of the filtering device of the tenth aspect of the invention, the filter base material and the contact section are securely connected, in other words, the integration of the filter body formed of the filter base material and the contact section are securely connected.
- According to the eleventh aspect of the invention, the filter body of the filtering device of the third aspect of the invention may be formed by connecting the rim portions of the folded filter base material or two filter base materials as in the ninth aspect of the invention, and the mesh constituting the inner layer, the mesh constituting the outer layer and the non-woven fabric constituting the intermediate layer include the same type of synthetic fibers.
- According to the structure of the eleventh aspect of the invention, the outer layer, the inner layer, and the intermediate layer can be securely integrated at the rim portions connected by welding.
-
FIG. 1 is a plan view of a filtering device according to the first embodiment of the invention; -
FIG. 2 is a sectional view of the filtering device taken along line 2-2 inFIG. 1 in a state that the filtering device is in use; -
FIG. 3 is a side view of the filtering device; -
FIG. 4A is an enlarged sectional view of a filter body; -
FIG. 4B is an enlarged sectional view of another filter body; -
FIG. 4C is an enlarged sectional view of a further filter body; -
FIG. 5 is a top plan view of a cylindrical socket body; -
FIG. 6 is a side view of the cylindrical socket body; -
FIG. 7 is a sectional view taken along line 7-7 inFIG. 5 ; -
FIG. 8 is a top plan view of a spacing member; -
FIG. 9 is a sectional view of the spacing member; -
FIG. 10 is a bottom plan view of the spacing member; -
FIG. 11 is a developed view showing a filter base material; -
FIG. 12 is a plan view of a filtering device according to the second embodiment of the invention; -
FIG. 13 is a sectional view of the filtering device taken along line 13-13 inFIG. 12 in a state that the filtering device is in use; -
FIG. 14 is a side view of the filtering device of the second embodiment of the invention; and -
FIG. 15 is an enlarged sectional view of a filter body in the filtering device of the second embodiment. - Hereunder, embodiments of the present invention will be explained with reference to the accompanied drawings.
FIG. 1 toFIG. 11 show a filtering device F according to the first embodiment of the invention, andFIG. 12 toFIG. 15 show a filtering device F′ according to the second embodiment of the invention. - More specifically,
FIG. 1 shows the filtering device F according to the first embodiment of the invention seen from above, andFIG. 2 shows a state that the filtering device F is in use, in which the filtering device F is shown in a sectional view. Also,FIG. 3 shows the filtering device F seen from a right side inFIG. 2 .FIG. 4A shows an enlarged sectional view of afilter body 1 of the filtering device F, andFIG. 4B shows an enlarged sectional structure of another example of the filter body of the filtering device F. Also,FIG. 5 toFIG. 7 show acylindrical socket body 4 forming the filtering device F, andFIG. 8 toFIG. 10 show aspacing member 6. Further,FIG. 11 shows afilter base material 2, which is shown in a developed view to explain an insert-molding method where the developedbase material 2 is placed in a metallic mold to mold thecylindrical socket body 4 and acontact section 5. InFIG. 11 , thecylindrical socket member 4 and thecontact section 5 are placed in a mold at positions shown by phantom lines tracing contours of the respective members. A projected line inFIG. 11 indicates a folding line of thefilter base material 2 for forming thefilter body 1 in a bag shape from thefilter base material 2 after the insert molding described above. -
FIG. 12 shows the filtering device F′ according to the second embodiment of the invention seen from above, andFIG. 13 is a sectional view of the filtering device F′ in a state that the filtering device F′ is in use.FIG. 14 shows the filtering device F′ seen from a right side inFIG. 13 . Further,FIG. 15 shows an enlarged sectional structure of afilter body 1 of the filtering device F′. - First, the first embodiment shown in
FIG. 1 toFIG. 11 will be explained. The filtering device F according to the first embodiment of the invention is attached to a fuel suction port Ha disposed inside a fuel tank T, to thereby remove water and foreign materials in fuel transferred to an internal combustion engine through the fuel suction port Ha. - Typically, the filtering device F is attached to the fuel suction port Ha of a suction pipe H inside the fuel tank T. The fuel is transferred to the internal combustion engine side through the fuel suction port Ha by a fuel pump P disposed inside the fuel tank T, or by a fuel pump disposed outside the fuel tank T.
- The filtering device F includes the
fuel body 1 formed in a bag shape. The filtering device F is attached to the fuel suction port Ha such that aninner space 10 of the bagshape fuel body 1 communicates with the fuel suction port Ha. - Also, the filtering device F includes the spacing
member 6, which is arranged inside thefilter body 1 to keep thefilter body 1 in an inflated bag shape. - Further, the
filter body 1 includes anupper surface section 13 and alower surface section 14, and at least thelower surface section 14 of thefilter body 1 includes aninner layer 3 a formed of a mesh or mesh member, and anouter layer 3 b formed of a non-woven fabric as shown inFIG. 4A . The mesh forming theinner layer 3 a can be formed of an extruded mesh or a woven mesh. - In the case that the mesh is formed of a woven mesh, typically, a synthetic fiber, such as a nylon fiber, a polyethylene fiber, or a polypropylene fiber, is woven into a mesh fine enough for separating water. The woven mesh can be formed by a weave for forming Japanese Tatami mat, a plain weave, a twill weave, or a satin weave.
- Also, the non-woven fabric forming the
outer layer 3 b is structured to efficiently remove the foreign materials in the fuel. Typically, the non-woven fabric is formed of a synthetic fiber, such as a nylon fiber, a polyethylene fiber, or a polypropylene fiber, and is formed of a mat or a sheet through various methods, such as a span bond and a melt blown. - In the example shown in
FIG. 1 toFIG. 11 , both the mesh and the non-woven fabric are formed of the synthetic fiber. Also, each of theupper surface section 13 and thelower surface section 14 includes theinner layer 3 a formed of the mesh and theouter layer 3 b formed of the non-woven fabric. - A sheet of the
filter base material 2 including theinner layer 3 a and theouter layer 3 b is folded in half such that theinner layer 3 a is located inside. At the same time,rim portions 20 of thefilter base material 2, which face each other at portions other than the folded side of thefilter base material 2, are bonded to each other to thereby form thefilter body 1 in the bag shape. Typically, an ultrasonic welding or a vibration welding is used to bond therim portions 20 of thefilter base material 2. - The
inner layer 3 a and theouter layer 3 b respectively may include fibers formed of the same synthetic resin, so that both thelayers - Alternatively, before the
filter base material 2 is formed into a bag shape, theinner layer 3 a and theouter layer 3 b may be spot-welded at portions other than therim portions 20 of thefilter base material 2 as described above. Accordingly, an unnecessary space between thelayers - Other than the example shown in the drawings, two sheets of the
filter base materials 2, which include theinner layer 3 a and theouter layer 3 b, may be bonded at therim portions 20 to form the bagshape filter body 1. - In the filtering device F including the
inner layer 3 a and theouter layer 3 b shown inFIG. 4A , since theinner layer 3 a is formed of the mesh, the spacingmember 6 does not directly contact theouter layer 3 b formed of the non-woven fabric. Especially, in the first embodiment, each of theupper surface section 13 and thelower surface section 14 has theinner layer 3 a formed of the mesh and theouter layer 3 b formed of the non-woven fabric. Therefore, the spacingmember 6 does not directly contact theouter layer 3 b at both the lower and upper sides of thefilter body 1. - As a result, since the spacing
member 6 does not slide against theouter layer 3 b when the inner wall surface Ta of the lower section of the fuel tank T moves (expanding and shrinking of the fuel tank T) due to a change of the internal pressure in the fuel tank T, no fabric piece produced by fraying the fibers of the non-woven fabric is sent to the internal combustion engine side from the fuel suction port Ha, and theouter layer 3 b will not be worn out with time. - Also, the
outer layer 3 b formed of the non-woven fabric effectively removes the foreign materials in the fuel. Accordingly, the number of the foreign materials sent into the fuel pump P is reduced, so that the life of the fuel pump P can be prolonged. - Alternatively, as shown in
FIG. 4B , the filter body may be formed of two or more laminated filter layers 3. Namely, afilter body 1′ is formed of afilter base material 2′ formed of the two or more filter layers 3 in a bag shape. - As shown in
FIG. 4B , among the filter layers 3 in thefilter body 1′, the filter layer 3 (hereinafter referred to as the first filter layer 30) forming anouter surface 11 of thefilter body 1′ can be formed of a woven mesh or woven mesh material with water separation function, and the filter layer 3 (hereinafter referred to as a second filter layer 31) adjacent to thefirst filter layer 30 at an inner side of thefirst filter layer 30 can be formed of the non-woven fabric. - The woven mesh forming the
first filter layer 30 has a mesh fine enough for the water separation, and formed by a weave for forming a Tatami mat, a plain weave, a twill weave, a satin weave, and the like. Also, the woven mesh is typically formed of a synthetic fiber, such as a nylon fiber, a polyethylene fiber, or a polypropylene fiber, i.e. at least one of a nylon fiber, a polyethylene fiber and a polypropylene fiber, and has a mesh fine enough for the water separation. - Also, the non-woven fabric forming the second filter layer 31 is structured to efficiently remove the foreign materials in the fuel. The non-woven fabric is formed of a synthetic fiber, such as a nylon fiber, a polyethylene fiber, or a polypropylene fiber. The fabric is formed of a mat or a sheet through various methods, such as a span bond and a melt blown.
- In the example shown in
FIG. 4B , both the woven mesh and the non-woven fabric are formed of the synthetic fiber. A sheet of thefilter base material 2′, which has thefirst filter layer 30 and the second filter layer 31, is folded in half such that the second filter layer 31 is located inside. At the same time,rim portions 20 of thefilter base material 2′, which face each other at portions other than the folded side of thefilter base material 2′, are bonded together to thereby form thefilter body 1′ in the bag shape. Typically, therim portions 20 of thefilter base material 2′ are bonded by an ultrasonic welding or a vibration welding. - Also, the synthetic fibers forming the
first filter layer 30 and the synthetic fibers forming the second filter layer 31 may be formed of the same type of synthetic resin, so that the filter layers 30, 31 can be bonded together at the welded portions by the aforementioned welding. - Alternatively, before the
filter base material 2′ is formed into a bag shape, thefirst filter layer 30 and the second filter layer 31 may be spot-welded at portions other than therim portions 20 of thefilter base material 2′ as described above. Accordingly, an unnecessary space between the filter layers 30, 31 is eliminated. - Other than the example shown in the drawings, two sheets of the
filter base materials 2′, which include thefirst filter layer 30 and the second filter layer 31, may be bonded together to form thefilter body 1 in the bag form. - Also, as shown in
FIG. 4B , thethird filter layer 32 formed of a non-woven fabric is provided at an inner side of the second filter layer 31, and thethird filter layer 32 is also able to remove the foreign materials in the fuel. - In the filtering device F including the
first filter layer 30 and the second filter layer 31 shown inFIG. 4B , thefirst filter layer 30 is formed of the woven mesh with a mesh fine enough for separating water. Thus, as opposed to the case that thefirst filter layer 30 is formed of the extruded mesh made of the synthetic resin, water is much more securely prevented from entering into theinner space 10 of the filter body. - Also, the second filter layer 31, which is formed of the non-woven fabric adjacent to the
first filter layer 30 at the inner side of thefirst filter layer 30, can remove the foreign materials in the fuel, which have passed through thefirst filter 30. Therefore, the number of the foreign materials into the fuel pump P is reduced, so that the life of the fuel pump P can be prolonged. - Alternatively, as shown in
FIG. 4C , afilter base material 2″ is formed of three or more filter layers in a bag shape. Thefilter base material 2″ has anoutside filter layer 30′ and aninside filter layer 32′ formed of a non-woven fabric. Additionally, thefilter base material 2″ has an intermediate filter layer formed of three intermediate filter layers 31A to 31C between theoutside filter layer 30′ and theinside filter layer 32′. - The
outside filter layer 30′ is formed of a woven mesh cloth with about 70 mesh size small enough for separating water, and formed of a Tatami weave, a plain weave, a twill weave, a satin weave, and the like. The woven mesh cloth is typically formed of a synthetic fiber such as a polypropylene fiber with a diameter of about 180 μm, and has holes with an average diameter of 180 μm. - The
inside filter layer 32′ is formed of a span bond non-woven fabric with an area density of 80 g/m2. The span bond non-woven fabric is formed of a synthetic fiber such as a polypropylene fiber with a diameter of about 20 μm and has holes with an average diameter of 50 μm. Theinside filter layer 32′ provides strength to thefilter base material 2′ and protects the intermediate filter layer. Theinside filter layer 32′ does not substantially provide a filtering property. - The intermediate filter layer is formed of the three intermediate filter layers 31A to 31C. The
intermediate filter layer 31A is arranged adjacent to theoutside filter layer 30′, and is formed of a melt blown non-woven fabric with an area density of 40 g/m2. The melt blown non-woven fabric of theintermediate filter layer 31A is formed of a synthetic fiber such as a polypropylene fiber with a diameter of about 7 μm and has holes with an average diameter of 27 μm. - The
intermediate filter layer 31B is arranged adjacent to theintermediate filter layer 31A, and is formed of a melt blown non-woven fabric with an area density of 30 g/m2. The melt blown non-woven fabric of theintermediate filter layer 31B is formed of a synthetic fiber such as a polypropylene fiber with a diameter of about 5 μm and has holes with an average diameter of 15.1 μm. - The
intermediate filter layer 31C is arranged between theintermediate filter layer 31B and theinside filter layer 32′, and is formed of a melt blown non-woven fabric with an area density of 40 g/m2. The melt blown non-woven fabric of theintermediate filter layer 31C is formed of a synthetic fiber such as a polypropylene fiber with a diameter of about 3 μm and has holes with an average diameter of 7.1 μm. - As described above, the
filter base material 2″ is formed of theoutside filter layer 30′, theinside filter layer 32′, and the three intermediate filter layers 31A to 31C between theoutside filter layer 30′ and theinside filter layer 32′. Accordingly, theoutside filter layer 30′ provides wear resistance against a bottom surface of the fuel tank, and theinside filter layer 32′ protects the intermediate filter layer and provides sufficient weld strength. Further, the intermediate filter layers are formed such that the fiber diameters and the average diameters of the holes decrease toward theinside filter layer 32′, respectively. Accordingly, it is possible to effectively prevent clogging while maintaining sufficient filtering performance. - In the
filter base material 2″ shown inFIG. 4C , theoutside filter layer 30′, theinside filter layer 32′, and the intermediate filter layers are formed of polypropylene fibers. Accordingly, it is possible to obtain sufficient water separation and securely bond all of the filter layers together at a welded portion with welding. A polypropylene fiber has excellent swelling property relative to fuel, thereby making it easy to control and maintain mesh size. - Further, in the first embodiment of the invention, the filtering device F includes a
cylindrical socket body 4 having anend portion 40 connected to the fuel suction port Ha and anend portion 41 connected to acommunication hole 12 formed in thefilter body 1. - More specifically, in the first embodiment of the invention, the
cylindrical socket body 4 is formed as a cylindrical body in which both theend portions cylindrical socket body 4 is integrally formed with thefilter body 1 such that thecylindrical socket body 4 constitutes one end of thefilter body 1 having a substantially rectangular shape in a plan view, and theother end portion 41 communicating with thecommunication hole 12 formed in theupper surface section 13 of thefilter body 1. - In the first embodiment of the invention, the
cylindrical socket body 4 includes anouter flange 42 around a cylindrical axis of thecylindrical socket body 4 at theother end portion 41 side. In thecylindrical socket body 4, a portion between theouter flange 42 and an opening rim of theother end portion 41 of thecylindrical socket body 4 constitutes aninsertion section 43 to be inserted into thecommunication hole 12 of thefilter body 1. At the same time, in a state that a flange surface of theouter flange 42 is integrally connected to theouter surface 11 of thefilter body 1, theinsertion section 43 is inserted inside thefilter body 1. Accordingly, the filtered fuel entering into theinner space 10 of thefilter body 1 is guided to the fuel suction port Ha side. As a result, in the first embodiment of the invention, by connecting theend portion 40 of thecylindrical socket body 4 to the fuel suction port Ha, the filtering device F can be properly attached to the fuel suction port Ha. - In the first embodiment, since the
cylindrical socket body 4 is provided at one end of thefilter body 1 as described above, thefilter body 1 is provided in an inclined form inside the fuel tank T such that thefilter body 1 gradually approaches the fuel suction port Ha from the other end toward the one end thereof provided with thecylindrical socket body 4, and thelower surface section 14 of thefilter body 1 at the other end contacts the inner wall surface Ta of the lower section of the fuel tank T as shown inFIG. 2 . - Also, in the first embodiment, the
cylindrical socket body 4 is molded by an insert molding, in which thefilter base material 2 before connected to the rim portions is inserted. More specifically, when thecylindrical socket body 4 is formed by the insert molding, theinsertion section 43 is located in thecommunication hole 12 in a state that thefilter base material 2 provided with thecommunication hole 12 is disposed in a mold, and the flange surface of theouter flange 42 is located closely in contact with the outer surface of theouter layer 3 b of thefilter base material 2. - Accordingly, in the first embodiment, the
filter base material 2 and thecylindrical socket body 4, in other words, the integration of thefilter body 1 formed of thefilter base material 2 and thecylindrical socket body 4 can be securely connected. Also, theouter surface 11 of the lower side of thefilter body 1 integrally includes theplastic contact section 5 for contacting the inner wall surface Ta of the lower section of the fuel tank T. - More specifically, in the first embodiment, the
contact section 5 is integrated with thefilter body 1 at thelower surface section 14 of the other end side of thefilter body 1 disposed in the inclined form inside the fuel tank T as described above. - The
contact section 5 has a substantially rectangular plate form elongated in a width direction of thefilter body 1. In a state that anupper surface 50 of thecontact section 5 is closely in contact with thelower surface section 14 of thefilter body 1, thecontact section 5 is integrally formed at thefilter body 1. - Accordingly, in the first embodiment of the invention, the
outer layer 3 b forming thefilter body 1 does not directly contact the inner wall surface Ta of the lower section of the fuel tank T. Thus, theouter layer 3 b will not be worn out with time as the inner wall surface Ta of the lower section of the fuel tank T does not slides against theouter layer 3 b when the inner wall surface Ta of the lower section of the fuel tank T moves (that is, when the fuel tank T expands or shrinks) due to the change in the internal pressure of the fuel tank T. - Also, in the first embodiment, the
contact section 5 is molded by the insert molding, in which thefilter base material 2 before connected is inserted. - More specifically, the
contact section 5 is formed by the insert molding such that a part of thecontact section 5 is closely in contact with the outer surface of theouter layer 3 b of thefilter base material 2 while thefilter base material 2 provided with thecommunication hole 12 is disposed in the metallic mold. - Accordingly, in the first embodiment, the
filter base material 2 and thecontact section 5, in other words, the integration of thefilter body 1 formed of thefilter base material 2 and thecontact section 5 are surely connected. - Also, in the first embodiment of the invention, the spacing
member 6 is formed of (1) aprincipal section 60 with a length extending substantially throughout a longitudinal length of thefilter body 1; (2) a plurality ofbranch sections 61 crossing at theprincipal section 60 and integrally connected to theprincipal section 60 at the crossing points; (3) spacingbodies branch sections 61 and both ends of theprincipal section 60; and (4) afitting section 64 to be fitted with theinsertion section 43 of thecylindrical socket body 4. - More specifically, the
spacing body 62 provided at eachbranch section 61 includes a downward projecting portion 62 a projecting downwardly below eachbranch section 61. - A projecting end of each downward projecting portion 62 a is formed in a curved shape such that the projecting end of the downward projecting portion 62 a does not poke the inner surface of the
filter body 1. Also, therespective branch sections 61 are formed such that positions of the projecting end surfaces of the downward projecting portions 62 a become gradually higher from a side where thecontact section 5 is formed toward a side where thecylinder socket body 4 is formed. - Also, the spacing
bodies 63 provided at theprincipal section 60 project downwardly from terminal ends of theprincipal section 60, and are formed in a sleigh shape in which projecting ends 63 a are formed in curved shapes such that upper sides thereof constitute inner sides of the curve. Further, a terminal end of each spacingbody 63 faces a central side of theprincipal section 60. - In the first embodiment of the invention, the
fitting section 64 has a rib surrounding a hole rim of ahole 65 formed in theprincipal section 60, in which the hole rim of thehole 65 is located at an upper surface side of theprincipal section 60. - The
fitting section 64 is designed to be fitted to theinsertion section 43 of thecylindrical socket body 4 inserted in theinner space 10 through thecommunication hole 12. When thefitting section 64 is fitted to theinsertion section 43, thehole 65 communicates with the inside of thecylinder socket body 4 as shown inFIG. 2 . - More specifically, in the first embodiment of the invention, in a state that the
cylindrical socket body 4 and thecontact section 5 are formed in thefilter base material 2, thefitting section 43 is fitted to theinsertion section 43 such that an upper surface of the spacingmember 6 faces theinner layer 3 a of thefilter base material 2. Then, thefilter base material 2 is folded in half such that theinner layer 3 a is located inside. Also, therim portions 20 of the foldedfilter base material 2, which face each other at portions other than the folded side of thefilter base material 2, are bonded together, so that the spacingmember 6 can be accommodated in theinner space 10 of thefilter body 1. - Now, the second embodiment shown in
FIG. 12 toFIG. 15 will be explained. The filtering device F′ according to the second embodiment of the invention is attached to a fuel suction port Ha disposed inside a fuel tank T, to thereby remove water and foreign materials in fuel transferred to an internal combustion engine through the fuel suction port Ha, as in the first embodiment. - Typically, the filtering device F′ is attached to the fuel suction port Ha of a suction pipe H inside the fuel tank T. The fuel is transferred to the internal combustion engine side through the fuel suction port Ha by a fuel pump P disposed inside the fuel tank T, or by a fuel pump disposed outside the fuel tank T.
- The filtering device F′ includes the
filter body 1 formed in a bag shape. The filtering device F′ is attached to the fuel suction port Ha such that aninner space 10 of the bagshape filter body 1 communicates with the fuel suction port Ha. - Also, the filtering device F′ includes the spacing
member 6, which is arranged inside thefilter body 1 to keep thefilter body 1 in an inflated bag shape. - Further, the
filter body 1 includes theupper surface section 13 and thelower surface section 14, and at least thelower surface section 14 of thefilter body 1 includes aninner layer 3 a formed of mesh or mesh member, anouter layer 3 b formed of mesh or mesh member, and anintermediate layer 3 c formed of non-woven fabric as shown inFIG. 15 . - The meshes forming the
inner layer 3 a and theouter layer 3 b can be formed of an extruded mesh or a woven mesh. - In the case that the mesh is formed of a woven mesh, typically, a synthetic fiber, such as a nylon fiber, a polyethylene fiber, or a polypropylene fiber, is woven into a mesh fine enough for separating water. The woven mesh can be formed by a weave by forming Tatami, a plain weave, a twill weave, or a satin weave.
- Also, the non-woven fabric forming the
outer layer 3 b is structured to efficiently remove the foreign materials in the fuel. Typically, the non-woven fabric is formed of a synthetic fiber, such as a nylon fiber, a polyethylene fiber, or a polypropylene fiber, and is formed of a mat or a sheet through various methods, such as a span bond and a melt blown. - In the example shown in
FIG. 12 toFIG. 15 , both the mesh and the non-woven fabric are formed of the synthetic fibers. Also, in this example, both theupper surface section 13 and thelower surface section 14 include theinner layer 3 a formed of the mesh, theouter layer 3 b formed of the mesh, and theintermediate layer 3 c formed of the non-woven fabric. - A sheet of the
filter base material 2 including theinner layer 3 a, theintermediate layer 3 c and theouter layer 3 b is folded in half such that theinner layer 3 a is located inside. At the same time,rim portions 20 of thefilter base material 2, which face each other at portions other than the folded side of thefilter base material 2, are bonded together to thereby form thefilter body 1 in the bag shape. Typically, an ultrasonic welding or a vibration welding is used to bond therim portions 20 of thefilter base material 2. - The
inner layer 3 a, theintermediate layer 3 c and theouter layer 3 b respectively may include fibers formed of the same synthetic resin, so that thelayers - Alternatively, before the
filter base material 2 is formed into a bag shape, theinner layer 3 a, theintermediate layer 3 c and theouter layer 3 b may be spot-welded at portions other than therim portions 20 of thefilter base material 2 as described above. Accordingly, an unnecessary space between thelayers - Other than the example shown in the drawings, two sheets of the
filter base materials 2, which include theinner layer 3 a, theintermediate layer 3 c and theouter layer 3 b, may be bonded at therim portions 20 to form the bagshape filter body 1. - In the filtering device F′ including the
inner layer 3 a, theintermediate layer 3 c and theouter layer 3 b shown inFIG. 15 , since theinner layer 3 a is formed of the mesh, the spacingmember 6 does not directly contact theintermediate layer 3 c formed of the non-woven fabric. Especially, in the second embodiment, both theupper surface section 13 and thelower surface section 14 has theinner layer 3 a formed of the mesh, theintermediate layer 3 b formed of the non-woven fabric and theouter layer 3 b formed of the mesh. Therefore, the spacingmember 6 does not directly contact theintermediate layer 3 b at both the lower and upper sides of thefilter body 1. - As a result, since the spacing
member 6 does not slide against theintermediate layer 3 c when the inner wall surface Ta of the lower section of the fuel tank T moves (expanding and shrinking of the fuel tank T) due to a change of the internal pressure in the fuel tank T, no fabric piece produced by fraying the fibers of the non-woven fabric is sent to the internal combustion engine side from the fuel suction port Ha, and theintermediate layer 3 c will not be worn out with time. - Also, the
intermediate layer 3 c formed of the non-woven fabric effectively removes the foreign materials in the fuel. Accordingly, the number of the foreign materials sent into the fuel pump P is reduced, so that the life of the fuel pump P can be prolonged. - Further, the
intermediate layer 3 c formed of the non-woven fabric is sandwiched between theouter layer 3 b and theinner layer 3 c. Therefore, theouter layer 3 b and theinner layer 3 a maintain a shape of the non-woven fabric forming theintermediate layer 3 c, so that thefilter body 1 maintains the adequately inflated bag shape. - In the second embodiment of the invention, the filtering device F′ includes a
cylindrical socket body 4 having anend portion 40 connected to the fuel suction port Ha and anend portion 41 connected to acommunication hole 12 formed in thefilter body 1. Thesocket body 4 has the same structure and is formed with thefilter body 1, as explained in the first embodiment. Therefore, the explanation thereof is omitted. - According to the structure of the filtering device of the invention, since the first filter layer is formed of the woven mesh having a fine mesh for improved water separation, water is separated more effectively in the inner space of the filter body as compared with an extruded mesh made of a synthetic resin.
- Also, according to the fuel-filtering device of the invention, the inner layer of the bag shape filter body is formed of the mesh, and the layer formed of the non-woven fabric is provided outside the inner layer. Therefore, even if the spacing member arranged inside the filter body to maintain the inflated bag shape is pressed and moved when the inner wall surface of the lower section of the fuel tank moves, since the spacing member does not directly contact the layer formed of the non-woven fabric, the non-woven fabric is not worn out, and the fibers forming the non-woven fabric are not frayed. Accordingly, no fabric piece produced by fraying the fibers forming the non-woven fabric is sent to the internal combustion engine side.
- The Disclosures of Japanese Patent Applications No. 2001-215668 filed on Jul. 16, 2001 and No. 2001-228295 filed on Jul. 27, 2001 are incorporated in the application.
- While the invention has been explained with reference to the specific embodiments of the invention, the explanation is illustrative and the invention is limited only by the appended claims.
Claims (11)
1. A fuel-filtering device to be disposed inside a fuel tank for filtering a fuel, comprising:
a filter body having a bag shape and a communication hole, and being formed of a plurality of laminated filter layers bonded each other at rim portions thereof by welding, said laminated filter layers including an outside filter layer formed of a woven mesh, an inside filter layer formed of a non-woven fabric, and a plurality of intermediate filter layers disposed between the outside filter layer and the inside filter layer and formed of a melt blown non-woven fabric, said inside filter layer having an average aperture diameter larger than that of the intermediate filter layers, said filter body being formed of at least one of a polyethylene fiber and a polypropylene fiber,
wherein the inside filter layer protects the intermediate filter layer and enhances a weld strength at the rim portions.
2. A fuel-filtering device according to claim 1 , wherein said filter body is formed only of the polypropylene fiber having oil-water separation property.
3. A fuel-filtering device according to claim 2 , wherein said plurality of intermediate filter layers is formed of melt blown non-woven fabrics of polypropylene fiber and has mesh sizes decreasing toward the inside filter layer.
4. A fuel-filtering device according to claim 3 , wherein said outside filter layer is formed of the fiber with a diameter about 180 μm, said plurality of intermediate filter layers is formed of the fiber with a diameter between about 3 and 7 μm, and said inside filter layer is formed of the fiber with a diameter about 20 μm.
5. A fuel-filtering device according to claim 1 , further comprising a plastic cylindrical socket body having one end to be connected to a fuel suction port in the fuel tank and the other end connected to the communication hole.
6. A fuel-filtering device according to claim 1 , further comprising a plastic contact section disposed at a bottom of the fuel-filtering device for contacting an inner wall of the fuel tank.
7. A fuel-filtering device according to claim 5 , wherein said filter body is formed of two sheet sections as a filter base material made at least of said two laminated filter layers, said two sheet sections of the filter base material being bonded together at the rim portions thereof to thereby form the bag shape, said two sheet sections of the filter body being formed of two separate sheets or one sheet folded in half, said cylindrical socket body being a part molded by an insert molding in which the filter base material is inserted in a mold before the rim portions are bonded.
8. A fuel-filtering device according to claim 6 , wherein said filter body is formed of two sheet sections as a filter base material made at least of said two laminated filter layers, said two sheet sections of the filter base material being bonded together at rim portions thereof to thereby form the bag shape, said two sheet sections of the filter body being formed of two separate sheets or one sheet folded in half, said plastic contact section being a part molded by an inset molding in which the filter base material is inserted in a mold before the rim portions are bonded.
9. A fuel-filtering device according to claim 1 , further comprising a spacing member arranged inside of the filter body to maintain the bag shape.
10. A fuel-filtering device according to claim 1 , wherein said plurality of intermediate filter layers consists of a first intermediate filter layer arranged adjacent to the outside filter layer, a second intermediate filter layer arranged adjacent to the first intermediate filter layer, and a third intermediate filter layer arranged between the second intermediate filter layer and the inside filter layer.
11. A fuel-filtering device according to claim 10 , wherein said first intermediate filter layer is made of a polypropylene fiber with a diameter of about 7 μm, said second intermediate filter layer is made of a polypropylene fiber with a diameter of about 5 μm, and said third intermediate filter layer is made of a polypropylene fiber with a diameter of about 3 μm.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/232,918 US20090039011A1 (en) | 2001-07-16 | 2008-09-26 | Fuel-filtering device |
Applications Claiming Priority (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001215668A JP4559667B2 (en) | 2001-07-16 | 2001-07-16 | Fuel filter device |
JP2001-215668 | 2001-07-16 | ||
JP2001228295A JP4843160B2 (en) | 2001-07-27 | 2001-07-27 | Fuel filter device |
JP2001-228295 | 2001-07-27 | ||
US10/190,601 US20030010692A1 (en) | 2001-07-16 | 2002-07-09 | Fuel-filtering device |
US11/057,236 US7478729B2 (en) | 2001-07-16 | 2005-02-15 | Fuel-filtering device |
US12/232,918 US20090039011A1 (en) | 2001-07-16 | 2008-09-26 | Fuel-filtering device |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/057,236 Continuation US7478729B2 (en) | 2001-07-16 | 2005-02-15 | Fuel-filtering device |
Publications (1)
Publication Number | Publication Date |
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US20090039011A1 true US20090039011A1 (en) | 2009-02-12 |
Family
ID=32912759
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US11/057,236 Expired - Fee Related US7478729B2 (en) | 2001-07-16 | 2005-02-15 | Fuel-filtering device |
US12/232,918 Abandoned US20090039011A1 (en) | 2001-07-16 | 2008-09-26 | Fuel-filtering device |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/057,236 Expired - Fee Related US7478729B2 (en) | 2001-07-16 | 2005-02-15 | Fuel-filtering device |
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US (2) | US7478729B2 (en) |
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US20090050551A1 (en) * | 2006-03-17 | 2009-02-26 | Nifco Inc. | Filter Device |
US20090321347A1 (en) * | 2007-01-10 | 2009-12-31 | Nifco Inc. | Fuel filter device |
US8173013B2 (en) * | 2008-07-10 | 2012-05-08 | Nifco Inc. | Fuel filter |
US20120248021A1 (en) * | 2011-03-29 | 2012-10-04 | Kuss Filtration Inc. | In-tank fluid filter with plastic retainer |
US8372278B1 (en) * | 2012-03-21 | 2013-02-12 | GM Global Technology Operations LLC | Liquid fuel strainer assembly |
US20130206663A1 (en) * | 2010-06-25 | 2013-08-15 | Honda Motor Co., Ltd. | Fuel filter device |
US20140290627A1 (en) * | 2013-04-02 | 2014-10-02 | Mitsubishi Electric Corporation | Fuel supply device and saddle type vehicle |
US10145341B2 (en) * | 2013-05-23 | 2018-12-04 | Coavis | Strainer and fuel pump module having the same |
US11073118B2 (en) * | 2015-12-17 | 2021-07-27 | Denso Corporation | Fuel pump and fuel pump module |
US11291936B2 (en) * | 2019-09-25 | 2022-04-05 | Coavis | Strainer for fuel pump |
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JP2006326515A (en) * | 2005-05-27 | 2006-12-07 | Aisan Ind Co Ltd | Filter |
JP2008274806A (en) * | 2007-04-26 | 2008-11-13 | Nifco Inc | Fuel filter device |
DE102007023641B4 (en) * | 2007-05-22 | 2015-04-02 | Ibs Filtran Kunststoff-/ Metallerzeugnisse Gmbh | Oil filter device |
US8220747B2 (en) * | 2008-11-25 | 2012-07-17 | Aai Corporation | System and method for a fuel bladder assembly with internal netting |
DE102010025218A1 (en) * | 2010-06-23 | 2011-12-29 | Hydac Filtertechnik Gmbh | Filter material for fluids |
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JP6301236B2 (en) * | 2014-11-07 | 2018-03-28 | 愛三工業株式会社 | Fuel filter device |
JP6695707B2 (en) * | 2016-02-19 | 2020-05-20 | 愛三工業株式会社 | Fuel supply device |
EP3321498B1 (en) * | 2016-11-10 | 2020-03-04 | Andreas Stihl AG & Co. KG | Suction head for connection to a fuel hose |
CN110312906B (en) * | 2016-12-23 | 2021-07-27 | 西港能源有限公司 | Apparatus and method for filtering a cryogenic fluid |
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US9593650B2 (en) * | 2013-04-02 | 2017-03-14 | Yamaha Hatsudoki Kabushiki Kaisha | Fuel supply device and saddle type vehicle |
US10145341B2 (en) * | 2013-05-23 | 2018-12-04 | Coavis | Strainer and fuel pump module having the same |
US10436161B2 (en) | 2013-05-23 | 2019-10-08 | Coavis | Strainer and fuel pump module having the same |
US11073118B2 (en) * | 2015-12-17 | 2021-07-27 | Denso Corporation | Fuel pump and fuel pump module |
US11291936B2 (en) * | 2019-09-25 | 2022-04-05 | Coavis | Strainer for fuel pump |
Also Published As
Publication number | Publication date |
---|---|
US20050150826A1 (en) | 2005-07-14 |
US7478729B2 (en) | 2009-01-20 |
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