WO1999047810A1 - Combinaison de cale et de came - Google Patents
Combinaison de cale et de came Download PDFInfo
- Publication number
- WO1999047810A1 WO1999047810A1 PCT/JP1999/001248 JP9901248W WO9947810A1 WO 1999047810 A1 WO1999047810 A1 WO 1999047810A1 JP 9901248 W JP9901248 W JP 9901248W WO 9947810 A1 WO9947810 A1 WO 9947810A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- shim
- cam
- sliding
- combination
- surface roughness
- Prior art date
Links
Classifications
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- 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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
- F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
-
- 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
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
- F02M59/102—Mechanical drive, e.g. tappets or cams
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
- F04B1/0413—Cams
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
- F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
- F04B9/042—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being cams
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H53/00—Cams ; Non-rotary cams; or cam-followers, e.g. rollers for gearing mechanisms
- F16H53/06—Cam-followers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2230/00—Manufacture
- F05B2230/90—Coating; Surface treatment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2203/00—Non-metallic inorganic materials
- F05C2203/08—Ceramics; Oxides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2203/00—Non-metallic inorganic materials
- F05C2203/08—Ceramics; Oxides
- F05C2203/0804—Non-oxide ceramics
- F05C2203/083—Nitrides
- F05C2203/0843—Nitrides of silicon
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2203/00—Non-metallic inorganic materials
- F05C2203/08—Ceramics; Oxides
- F05C2203/0804—Non-oxide ceramics
- F05C2203/083—Nitrides
- F05C2203/0847—Nitrides of titanium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2203/00—Non-metallic inorganic materials
- F05C2203/08—Ceramics; Oxides
- F05C2203/0804—Non-oxide ceramics
- F05C2203/083—Nitrides
- F05C2203/0852—Nitrides of zirconium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2203/00—Non-metallic inorganic materials
- F05C2203/08—Ceramics; Oxides
- F05C2203/0865—Oxide ceramics
- F05C2203/0869—Aluminium oxide
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/21—Elements
- Y10T74/2101—Cams
- Y10T74/2107—Follower
Definitions
- the present invention is used at lower cost, reduced amount of wear, and improved fatigue characteristics, particularly for use in a mechanical system of a drive system of a fuel pump for an automobile engine. Concerning the combination of shim and cam. This combination is effective for improving the durability of mechanical parts and maintaining stable pump performance. BACKGROUND ART In recent years, in-cylinder direct injection engines that inject gasoline / light oil directly into a combustion chamber have been put into practical use for the purpose of improving fuel efficiency of automobile internal combustion engines due to global environmental problems.
- the shim sliding surface facing the cam of the valve train has a surface roughness Rz of 0.02 to 0.5 ⁇ m.
- An attempt to reduce the friction loss between the two by providing a coating layer of ⁇ TiN was introduced.
- This hard surface film has a thickness of about 0.5 to 10 ⁇ .
- the shim surface coated with TiN and the cam surface By sliding, the cam surface is polished by the shim surface so that it is not necessary to polish the surface with high precision.
- Japanese Patent Application Laid-Open No. 6-25111 discloses a silicon nitride having a surface roughness R z of 0.2 to 0.7 ⁇ for the same purpose and the same purpose as the above-mentioned publication.
- the structure of a shim made of ceramics is disclosed, and Japanese Patent Application Laid-Open No. 6-137404 also discloses a shim made of ceramics having a surface finished and high hardness.
- cam drive mechanisms described in any of the publications are applied to a single mountain (one convex curved surface) type.
- This type of fuel pump cam drive mechanism is conventionally applied to vehicles with large re-engine cylinders and space, such as large diesel commercial vehicles. It cannot be used as it is for cars.
- the fuel pump for a diesel-injected direct injection engine has the entire volume and weight of the engine. There is a need to reduce. Therefore, the reciprocating mechanism parts are reduced in weight and cost by reducing the number of parts and their volume, etc., mainly from cams using steel materials, to rolling friction methods via cam rollers, and from cams and shims. There is an urgent need to change to the Noseri friction method (Fig. 1). In addition, these fuel pumps have ample space for mounting large, heavy pumps with the same number of fuel compression mechanisms as the number of engine cylinders, such as row-type fuel pumps for large diesel vehicles. There is no.
- FIG. 1 for example, it is usually constituted by a single-cylinder fuel compression mechanism having a plurality of cam ridges, and this mechanism pumps fuel to each cylinder of the engine body.
- a cam roller made of a metal material hereinafter simply referred to as a roller
- the tangent line between the sliding surface of the cam and the roller when sliding is very complicated. Therefore, It is necessary to make rolling contact without generating a large relative sliding amount at the sliding portion between the roller and the cam. This complicates the sliding surface shape of the cam. As a result, the processing of the cam takes time and costs.
- the sliding of a cam and a shim having a plurality of cam ridges has an advantage that the complicated shape design of the cam sliding surface for smoothing the tangent line between the cam and the shim as described above is not required. .
- reduction of the frictional work of the cam and shim when the above-mentioned rollers change from re-friction to sliding friction and suppression of the abrasion amount have become major issues.
- a method of providing a crowning shape without performing machining of such a shape is disclosed in, for example, Japanese Patent Application Laid-Open No. 63-289306. According to this, a ceramic member whose surface has been smoothed in advance is fitted to a metal member, and the ceramic member is deformed by a stress generated at the time of the fitting to give a crowning shape.
- a method requires another member for fitting, and does not provide a highly accurate crowning shape.
- the friction work due to sliding as described above generally takes into consideration the minimum gap or minimum oil film thickness between opposing sliding parts and the sliding of sliding parts. It is said that the properties of the moving surface have a significant effect on sliding characteristics and friction loss.
- the friction work in the above-mentioned sliding is expressed by the following equation.
- F A ⁇ a S m + (I-a) S t ⁇
- F the friction work
- A the sliding area
- ⁇ the oil film rupture area ratio
- S m the solid contact between the opposing sliding members.
- the shear strength, St is the shear strength of the oil film
- a S m is the friction work when there is no oil film (friction work under boundary lubrication). Represents frictional work in the presence of an oil film (frictional work under complete fluid lubrication).
- Sm is larger than St, it is necessary to increase the term of friction work under complete fluid lubrication in order to reduce the friction work F, that is, to reduce ⁇ .
- the present invention supplies a shim having high wear resistance and high fatigue characteristics during sliding, particularly for a reciprocating mechanical mechanism part having severe sliding conditions.
- the aim is to supply a shim provided at a lower cost with a mechanism for suppressing the one-side contact and making the contact surface uniform.
- a combination of a shim and a cam provided by the present invention is such that the cam has a plurality of cam ridges, and the hardness of the sliding surface of the shim surface with the cam is lower than that of the cam. High hardness.
- the surface roughness of the surface that slides with the cam and other parts of the mechanism is 0.07 ⁇ to 0.4 ⁇ in ten-point average surface roughness Rz.
- the sliding surface with other components other than the cam includes a flat surface and a surface having a convex spherical (crowning) shape on the surface in contact with the flat surface. Examples are shown in FIGS. 4 and 13.
- the crowning refers to, for example, a convex spherical surface in contact with the plunger of the shim in FIG. 5 showing a cross section of the mechanism.
- the maximum height of the crowning described later is the dimension shown in Fig. 3 or Fig. 4.
- the hardness of the shim surface is higher than that of the sliding surface of the cam to be slid, it is effective for reducing the wear amount of the cam and the shim. It is desirable that the surface hardness of the sliding surface between the shim and the cam be 100 or more in terms of pick hardness. In this way, the wear resistance and fatigue characteristics are remarkably improved even when sliding is performed by a plurality of mountain cams. Furthermore, the deterioration of the surface roughness can be suppressed even when the shim surface smoothed by the finishing process is brought into solid contact with the cam.
- Finishing the surface roughness of the shim to 0.4 ⁇ m or less in terms of the ten-point average surface roughness Rz is effective for increasing the oil film parameter in the above equation (2).
- the hardness of the shim surface is higher than that of the sliding surface of the other cam, so if the surface roughness exceeds 0.4 ⁇ m, it will attack and wear the other cam, resulting in the shape of the cam. This is undesirable because it causes a change in the injection timing of the pump. Further, obtaining a smooth surface of less than 0.07 m is only time-consuming, and the above effects are not improved, which is not economically preferable.
- Another reason for increasing the surface roughness of the shim side is that finishing using mechanical processing such as grinding, rubbing, and polishing does not have a complicated curved surface shape like the cam sliding surface. This is because it can be done easily and easily.
- the shim of the present invention includes a flat surface and a flat spherical surface (crowning), which are in contact with sliding parts other than a cam, such as a lifter, to which the shim is attached and contacted. is there.
- a cam such as a lifter
- the surface of the shim sliding with the cam is roughened as described above. Is a smooth spherical shape of 0.7 to 0.4 ⁇ m at Rz
- the surface on which the shim is to be attached such as a lifter or plunger, has a convex spherical shape (crowning).
- the shim does not slide with a large relative speed to its mounting surface. For this reason, there is no need to finish the highly smoothed surface as shown in Fig. 3, for example, and an economical advantage can be obtained.
- the contact and contact between the sliding surfaces of the shim and the cam are properly adjusted. Pressure can be reduced. For this reason, a ceramic coating film such as CrN or TiN or a coating film such as DLC can be used on the sliding surfaces of the shim and the cam without peeling during use.
- the preferable shape of the shim is that the flatness of the sliding surface with the cam is 0.5 ⁇ ! It has a flat surface of ⁇ 5 ⁇ m or less, and it comes into sliding contact with the cam other than the one on which it is mounted.
- the maximum crowning height of the contact surface with a mounting part such as a lifter is 5 ⁇ !
- the flatness of the sliding surface with the cam is set to 5 ⁇ or less in order to increase the parameter ⁇ in the above equation (2). Further, if the flatness exceeds 5 ⁇ , the contact with the cam tends to be uneven. Finishing to less than 0.5 ⁇ may lead to an increase in cost.
- the crowning height of the abutment surface is defined by that shown in Fig. 4.If this height exceeds 50 ⁇ m, machining to provide a convex spherical shape takes time and is economically difficult. More disadvantageous. If it is less than 5 ⁇ m, the function of adjusting the one-sided contact and contact with the cam becomes insufficient, and the cam tends to be unevenly worn.
- the surface roughness of the ⁇ -shaped spherical surface of the shim that comes into sliding contact with the component to be mounted is 0.6 ⁇ ! Preferably, it is between ⁇ 6.4 ⁇ m.
- the lower limit is preferably 0.6 ⁇ from the economical viewpoint of machining that provides a convex spherical surface, and when it exceeds 6.4 ⁇ m, the aggressiveness to the mating material to which the shim is attached increases. As a result, the wear amount of the partner material tends to increase.
- some shims of the present invention are made of ceramics.
- the shim made of ceramics By making the shim made of ceramics, the above-mentioned wear resistance and fatigue characteristics are excellent. Further, since the coefficient of thermal expansion becomes small, it becomes possible to maintain a stable fuel injection timing / amount of fuel injection even in severe sliding.
- the shim material made of ceramics there is a ceramic nitride-based ceramic, that is, a material whose main component is gay-nitride and / or sialon.
- shims have high strength and hardness, and low thermal expansion coefficients. Is required.
- it is used as a reciprocating mechanical mechanism part, it must be lightweight.
- a gay nitride ceramic it is preferable from the viewpoint of durability if it contains at least 80% by weight of gay nitride and / or sialon and has a three-point bending strength of at least 70 OMPa according to JISR 1601.
- the porosity of the sliding surface is particularly large on the same surface. It is desirable that the maximum pore diameter on the same side be 10% or less.
- the shim must be mounted on the lifter without being fixed or bonded, or the shim should be bonded (eg, brazed) or fitted as a means of bonding to the metal base material.
- FIG. 1 is a schematic diagram showing a reciprocating mode of a rolling system and a sliding system.
- FIG. 2 is a schematic diagram of an example of a conventional mouth ring or shim mechanism.
- FIG. 3 is a schematic view of an example of a conventional shim mechanism with a crowning.
- FIG. 4 is a schematic diagram of crowning of the mounting contact surface of the shim of the present invention.
- FIG. 5 is a schematic view showing an example of a method of mounting a shim according to the present invention.
- FIG. 6 is a schematic view of an example of a method for processing the shim crowning of the present invention.
- FIG. 7 is a schematic diagram of the tester used in the example.
- FIG. 8 is a schematic diagram showing the amount of wear of the shim and the cam of the example.
- FIG. 9 is a schematic diagram illustrating the wear amount of the contact surface on the mounting side of the shim of the example.
- FIG. 10 is a front view of a cam mechanism having a plurality of cams.
- FIG. 11 is a front view of the cam mechanism of the single mountain.
- FIG. 12 is an explanatory diagram of a cam and a plunger used in the example. BEST MODE FOR CARRYING OUT THE INVENTION
- the present invention will be specifically described based on examples.
- a four-jawed cam 2 having a shape as shown in FIG. 10 for reciprocating a plunger 1 as shown in FIG. 7 is used, and a cam mechanism comprising this and a shim, and a drive motor 4 for rotating the cam shaft 3 and
- a fuel pump simulation test machine equipped with an oil pump 5 for supplying lubricating oil to the cam mechanism and a torque meter 6 for measuring the driving torque of the cam shaft 3 was manufactured.
- the cam used was one obtained by chill hardening the surface of ordinary iron and finishing its sliding surface to 3.2 ⁇ with a ten-point average surface roughness Rz by a predetermined machining process.
- the conventional shim material is SCM420 carburized and hardened steel, and the surface of the sliding surface is similarly finished to 3.2 ⁇ with a 10-point average surface roughness R
- a manganese phosphate salt film was applied by a heat treatment.
- the outer diameter of the shim is 20 mm and the thickness is 2 mm.
- the surface was finished to the ten-point average surface roughness shown in Table 1 by variously combining the grinding with a diamond grindstone and the lapping and polishing with diamond free abrasive grains.
- the surface of the above-described conventional steel shim material was finished with a WA grindstone to finish the ten-point average surface roughness to various surface roughness shown in Table 1. Then, a 1 ⁇ m-thick diamond and DLC coating film and a 3 ⁇ m-thick TiN and CrN coating film were provided on the surface by a known physical vapor deposition method. Note that the surface hardness of each shim is also shown in the table.
- a mark for measuring the rotation period was previously put on the cam, and the time when the cam passed through the mark was measured by the optical measuring device 7.
- a mark is also placed on the top of the plunger, and the time when this mark comes closest is measured by an optical measuring instrument, and the change in the difference between the former time and the latter time is determined by the difference in injection timing.
- the deviation when each shim was used was evaluated as a relative value, with the deviation between 1 hour and 500 hours after the start of operation using a conventional steel shim being 100%. The smaller the relative value is, the smaller the change over time in the injection timing is, and the more stable the function as the fuel injection pump is.
- Example 1 Using the same testing machine as in Example 1, the cam was used as a single mountain as shown in Fig. 11 and the four mountain cams as in Example 1 (lubricating oil temperature 150 ° C). The operation was performed at 300,000 rpm for each of the cams for 500 hours and the single mountain cam for 2,000 hours, and the number of reciprocations of the plunger was set to the same value for each cam. The same evaluation as in Example 1 was performed. The shim used in the evaluation was prepared by finishing conventional steel with a surface roughness of 3.2 z as the standard for relative comparison (single peak and four peaks). The surface roughness was changed, and the three types of Si 3 N 4 , Cr N coating layer, and DLC coating layer shown in Example 1 were used. It has to have.
- Example 1 a fuel pump simulation test machine as shown in FIG. 7 was produced. Here, the same cam as in Example 1 was prepared. The outer diameter of the shim is 20 mm and the thickness is 2 mm.
- the conventional shim material is SCM 420 carburized and hardened steel, which was finished in the same manner as in Example 1 and provided with a manganese phosphate salt coating.
- the same commercially available Si 3 N 4 sintered body as in Example 1, A 1, 0, and the surface of the sintered body were finished in the same manner as in Example 1 and the ten-point average shown in Table 4 was obtained. Surface roughness was set.
- the surface of the above-mentioned conventional steel shim material was finished with a WA grindstone to finish the ten-point average surface roughness to various surface roughness shown in Table 1, and then physical vapor deposition Using a method, a 3 ⁇ thick TiN, CrN coating film was provided on the sliding surface with the cam by the method.
- a 3 ⁇ thick TiN, CrN coating film was provided on the sliding surface with the cam by the method.
- the crowning shape the sliding surface with each cam and the surface of the shim in contact with the plunger to which the shim is attached (described as the contact surface in Table 4) are shown.
- the crowning shape was given by the processing method shown in 6, and the surface roughness was shown in Table 4.
- the wear resistance of the shim and the cam is improved, and the durability as a part is clarified, and the processing cost can be greatly reduced. It became clear that it was possible to provide simple parts.
- Example 6 Using the same tester as in Example 1, the Si 3 N 4 of Example 3 was subjected to finishing with the respective crowning height and surface roughness shown in Table 6 in the same manner as in Example 3, and The results of the same evaluation as in Example 3 are shown in the table. In this case, the amount of wear generated on the contact surface with the shim due to sliding between the shim and the substrate to be mounted is determined by measuring the length W before and after the test shown in FIG. The measurement results after the time are also shown in the table. [Table 6]
- Table 7 shows the relative values of the machining cost of the sliding surface and contact surface with the cam of all the shims shown in Table 6 as Sample 1.
- the wear resistance of the shim and the cam is improved, and the durability as a part is clarified, and the processing cost can be greatly reduced. It became clear that it was possible to provide simple parts.
- Example 8 Using the same tester as in Example 1, the same evaluation as in Example 3 was performed on the sample 8 of Example 4 with various finishes shown in Table 8 for the flatness of the sliding surface with the cam, as shown in Table 8. The results are shown in the table.
- Table 9 shows the relative cost of all the shims shown in Table 8 assuming that the machining cost of the sliding surface and contact surface with the cam was 1 for sample 1.
- the cam mechanism having a plurality of cam ridges can reduce the friction work compared with the case where only the shim of the present invention is used for the cam mechanism having a single ridge. It has been found that a remarkable reduction in the aging of the injection timing is achieved.
- the coating film such as ceramics can be used without film peeling, but in combination with the multiple mountain cam of the present invention, film peeling occurs and sufficient durability can be obtained. The invention of the present invention was clarified.
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99938041A EP0984161A4 (en) | 1998-03-19 | 1999-03-15 | COMBINATION OF SPACER AND NECK |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10/70466 | 1998-03-19 | ||
JP7046698 | 1998-03-19 | ||
JP9919498 | 1998-04-10 | ||
JP10/99194 | 1998-04-10 |
Publications (1)
Publication Number | Publication Date |
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WO1999047810A1 true WO1999047810A1 (fr) | 1999-09-23 |
Family
ID=26411623
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/001248 WO1999047810A1 (fr) | 1998-03-19 | 1999-03-15 | Combinaison de cale et de came |
Country Status (3)
Country | Link |
---|---|
US (1) | US6237441B1 (ja) |
EP (1) | EP0984161A4 (ja) |
WO (1) | WO1999047810A1 (ja) |
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CN102418573A (zh) * | 2010-09-28 | 2012-04-18 | 日立汽车系统株式会社 | 内燃机的气门挺柱 |
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JP3555844B2 (ja) * | 1999-04-09 | 2004-08-18 | 三宅 正二郎 | 摺動部材およびその製造方法 |
JP3924999B2 (ja) * | 1999-08-12 | 2007-06-06 | 株式会社日立製作所 | 燃料ポンプ及びそれを用いた筒内噴射エンジン |
KR20010061997A (ko) * | 1999-12-01 | 2001-07-07 | 오카야마 노리오 | 다이어몬드-코팅 활주부 |
US6739238B2 (en) | 2000-11-20 | 2004-05-25 | Nissan Motor Co., Ltd. | Sliding structure for a reciprocating internal combustion engine and a reciprocating internal combustion engine using the sliding structure |
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Also Published As
Publication number | Publication date |
---|---|
EP0984161A1 (en) | 2000-03-08 |
US6237441B1 (en) | 2001-05-29 |
EP0984161A4 (en) | 2006-01-25 |
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