US20040104071A1 - Apparatus for damping resonance in a conduit - Google Patents
Apparatus for damping resonance in a conduit Download PDFInfo
- Publication number
- US20040104071A1 US20040104071A1 US10/604,848 US60484803A US2004104071A1 US 20040104071 A1 US20040104071 A1 US 20040104071A1 US 60484803 A US60484803 A US 60484803A US 2004104071 A1 US2004104071 A1 US 2004104071A1
- Authority
- US
- United States
- Prior art keywords
- conduit
- recited
- exhaust
- sound
- perforation
- 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
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Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/08—Other arrangements or adaptations of exhaust conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2470/00—Structure or shape of gas passages, pipes or tubes
- F01N2470/02—Tubes being perforated
- F01N2470/04—Tubes being perforated characterised by shape, disposition or dimensions of apertures
Definitions
- the present invention relates to an apparatus for damping resonance in a conduit for transporting exhaust gases from an internal combustion engine.
- a silencer system consists of one or more chamber(s) with intermediate conduits.
- the sound pressure inside the conduit will vary with the position along the conduit.
- Pipe resonance can sometimes occur in an exhaust system and stems from ignition pulses from the engine being reflected between the mouth of the exhaust pipe and a preceding part of the exhaust system, frequently that part being the chamber in the silencer closest to the end pipe. In most cases, this only happens at a specific engine speed, where the wavelength of the ignition frequency coincides with the length between the two adjacent reflecting pipe ends.
- One object of the invention is therefore to produce an apparatus which solves the above-described problem(s), and without appreciably raising manufacturing costs.
- an apparatus configured according to the teachings of the presently disclosed invention includes a conduit that is provided with at least one perforation located at a distance from the outer end of the conduit.
- FIG. 1 shows a diagrammatic plan view of a portion of a conduit designed according to a first variant of the invention
- FIG. 2 is a longitudinal section through a portion of a conduit designed according to a second variant of the invention.
- FIG. 3 is a longitudinal section through a portion of a conduit designed according to a third variant of the invention.
- FIGS. 4 - 5 show modifications of the variant of the invention shown in FIG. 2;
- FIGS. 6 - 7 show a part of the plate wall of the conduit in a section and a plan view, respectively, illustrating examples of different perforations.
- the invention relates to an apparatus that can be applied to exhaust systems and silencer systems in various types of internal combustion engine arrangements, for example engines which function according to the Otto, Diesel or Wankel principles.
- the engine can be located in a vehicle, for example a passenger car, a truck, a work vehicle, a marine vessel or other type of craft.
- the invention can also be applied to fixed engine installations, such as engine-driven power plants and the like.
- the apparatus can then be located in different positions along the pipe portions which form part of the exhaust and silencer systems of the engine.
- Such a pipe portion can form, for example, the end pipe which transports exhaust gases from a silencer out into the surrounding environment.
- FIG. 1 shows a pipe portion 10 , curved essentially at a right angle, with an outlet end 11 and an inlet end 12 , the wall 13 of which has a perforation 14 on the inside of the curve.
- the perforation connects the inner volume of the pipe to the surrounding environment.
- FIG. 2 shows on a larger scale an alternative embodiment of the invention in which a number of perforations 14 are made in the pipe wall 13 of a pipe section 10 having a portion 10 a with a slightly reduced flow area.
- the flow rate will increase within this portion with a commensurate reduction in static pressure in the pipe as a consequence.
- surrounding air can be sucked into the pipe through the perforations without exhaust gases escaping.
- FIG. 3 illustrates a further variant of the invention, where an indentation 15 has been made in the pipe wall 13 in such a manner that a reduction in the flow area has been brought about in this part.
- the pipe wall Downstream of the indentation 15 , the pipe wall forms a step 16 essentially at right angles out to the normal cross section.
- a perforation 14 is located on the downstream side of this step.
- An exhaust gas flow through the pipe section in FIG. 3 will increase its flow rate at the indentation 15 .
- the reduced pressure will draw air in from the surrounding environment of the pipe via the perforation 14 .
- Another way of avoiding leakage of exhaust gases via a perforation can be to introduce a partly sound-permeable material which will serve as flow resistance.
- This material can be applied on the outside of the pipe, inside the pipe or in the perforations themselves.
- the material can consist of steel, another metal, glass fiber, textile material, ceramic and so forth.
- the material can, for example, have a structure in the form of a mesk, net, unstructured or structured fabric, and also porous medium.
- FIG. 4 shows a modification of the invention where a conduit designed according to FIG. 2 has been provided with an outer sleeve 17 which covers the perforations and is provided with a large number of small perforations 18 .
- the purpose of the outer sleeve 17 is essentially to “conceal” the perforations 14 .
- the outer sleeve 17 also provides a certain damping of sound leakage via the perforations 14 . This leakage can be damped further by virtue of a space 19 between the conduit 10 and the outer sleeve being filled with a suitable damping material, for example mineral wool.
- FIG. 5 shows another modification of the invention where a conduit designed according to FIG. 2 has been provided with an internal cuff made of sound-permeable non-woven fabric.
- the perforations 14 can be made in a number of different ways.
- the invention comprises a hole which is usually made in a geometrical shape, for example round, square, V-shaped, slot-shaped or any other shape.
- the apparatus according to the invention can comprise a combination of a number of pipe portions 10 arranged in series or in parallel.
Abstract
Method and apparatus for damping resonance in a conduit (10) utilized for transporting exhaust gases from an internal combustion engine. The resonance is damped by virtue of the conduit (10) being provided with at least one perforation (14) located at a distance from the outlet end (11) of the conduit.
Description
- This present application is a continuation patent application of International Application No. PCT/SE02/00260 filed 21 Feb. 2002 which was published in English pursuant to Article 21(2) of the Patent Cooperation Treaty, and which claims priority to Swedish Application No. 0100585-9 filed 21 Feb. 2001. Both applications are expressly incorporated herein by reference in their entireties.
- 1. Field of the Invention
- The present invention relates to an apparatus for damping resonance in a conduit for transporting exhaust gases from an internal combustion engine.
- 2. Background
- In most cases, a silencer system consists of one or more chamber(s) with intermediate conduits. The sound pressure inside the conduit will vary with the position along the conduit. Pipe resonance can sometimes occur in an exhaust system and stems from ignition pulses from the engine being reflected between the mouth of the exhaust pipe and a preceding part of the exhaust system, frequently that part being the chamber in the silencer closest to the end pipe. In most cases, this only happens at a specific engine speed, where the wavelength of the ignition frequency coincides with the length between the two adjacent reflecting pipe ends.
- In cases when resonance has occurred in the pipe, the differences in sound pressure will be particularly great between different positions. A high sound pressure then builds up in the end pipe, and sound escapes into the surrounding environment via the mouth to a greater extent than would otherwise have been the case. Known solutions to this problem usually involve the insertion of additional silencer units, which results in higher costs and can also lead to an increase in the pressure drop.
- One object of the invention is therefore to produce an apparatus which solves the above-described problem(s), and without appreciably raising manufacturing costs.
- To this end, an apparatus configured according to the teachings of the presently disclosed invention includes a conduit that is provided with at least one perforation located at a distance from the outer end of the conduit. By virtue of this design of the apparatus, an effective reduction in the resonance level is brought about in a simple manner without impacting costs of manufacture in any significant way.
- The invention will be described in greater detail below with reference to illustrative embodiments shown in the accompanying drawings, in which:
- FIG. 1 shows a diagrammatic plan view of a portion of a conduit designed according to a first variant of the invention;
- FIG. 2 is a longitudinal section through a portion of a conduit designed according to a second variant of the invention;
- FIG. 3 is a longitudinal section through a portion of a conduit designed according to a third variant of the invention;
- FIGS.4-5 show modifications of the variant of the invention shown in FIG. 2; and
- FIGS.6-7 show a part of the plate wall of the conduit in a section and a plan view, respectively, illustrating examples of different perforations.
- The invention relates to an apparatus that can be applied to exhaust systems and silencer systems in various types of internal combustion engine arrangements, for example engines which function according to the Otto, Diesel or Wankel principles. The engine can be located in a vehicle, for example a passenger car, a truck, a work vehicle, a marine vessel or other type of craft. The invention can also be applied to fixed engine installations, such as engine-driven power plants and the like. The apparatus can then be located in different positions along the pipe portions which form part of the exhaust and silencer systems of the engine. Such a pipe portion can form, for example, the end pipe which transports exhaust gases from a silencer out into the surrounding environment.
- FIG. 1 shows a
pipe portion 10, curved essentially at a right angle, with anoutlet end 11 and aninlet end 12, thewall 13 of which has aperforation 14 on the inside of the curve. The perforation connects the inner volume of the pipe to the surrounding environment. When the pipe portion is mounted in an exhaust system, for example as an end pipe, and a pulsating exhaust gas flow passes through the pipe portion, resonance may occur. Some of the sound pressure in this resonance can escape to the surrounding environment via theperforation 14. This means that the size of the resonance is reduced. In this way, the escaping sound, both from the mouth of the outlet and 11 and through theperforation 14, will occur at a significantly lower sound pressure level than would have exited theend 11. Overall, a smaller magnitude sound will be emitted to the surrounding environment from the exhaust system. - Exhaust emissions through the
perforation 14 can be avoided, because the hole is located in a part of the flow passage where the static pressure is comparatively lower than in other parts of the passage. - FIG. 2 shows on a larger scale an alternative embodiment of the invention in which a number of
perforations 14 are made in thepipe wall 13 of apipe section 10 having aportion 10 a with a slightly reduced flow area. In this connection, the flow rate will increase within this portion with a commensurate reduction in static pressure in the pipe as a consequence. As a result, surrounding air can be sucked into the pipe through the perforations without exhaust gases escaping. - FIG. 3 illustrates a further variant of the invention, where an
indentation 15 has been made in thepipe wall 13 in such a manner that a reduction in the flow area has been brought about in this part. Downstream of theindentation 15, the pipe wall forms astep 16 essentially at right angles out to the normal cross section. Aperforation 14 is located on the downstream side of this step. An exhaust gas flow through the pipe section in FIG. 3 will increase its flow rate at theindentation 15. The reduced pressure will draw air in from the surrounding environment of the pipe via theperforation 14. - Another way of avoiding leakage of exhaust gases via a perforation can be to introduce a partly sound-permeable material which will serve as flow resistance. This material can be applied on the outside of the pipe, inside the pipe or in the perforations themselves. The material can consist of steel, another metal, glass fiber, textile material, ceramic and so forth. The material can, for example, have a structure in the form of a mesk, net, unstructured or structured fabric, and also porous medium.
- FIG. 4 shows a modification of the invention where a conduit designed according to FIG. 2 has been provided with an
outer sleeve 17 which covers the perforations and is provided with a large number ofsmall perforations 18. The purpose of theouter sleeve 17 is essentially to “conceal” theperforations 14. Theouter sleeve 17 also provides a certain damping of sound leakage via theperforations 14. This leakage can be damped further by virtue of aspace 19 between theconduit 10 and the outer sleeve being filled with a suitable damping material, for example mineral wool. - FIG. 5 shows another modification of the invention where a conduit designed according to FIG. 2 has been provided with an internal cuff made of sound-permeable non-woven fabric.
- As is evident from FIGS. 6 and 7, the
perforations 14 can be made in a number of different ways. The invention comprises a hole which is usually made in a geometrical shape, for example round, square, V-shaped, slot-shaped or any other shape. - The invention is not to be regarded as being limited to the illustrative embodiments described above, but a number of other variants and modifications are possible within the scope of the following patent claims. For example, the apparatus according to the invention can comprise a combination of a number of
pipe portions 10 arranged in series or in parallel.
Claims (11)
1. An apparatus for damping resonance in a conduit (10) for transporting exhaust gases from an internal combustion engine, which conduit (10) is provided with at least one perforation (14) located at a distance from the outlet end (11) of the conduit and at a point in the conduit (10) with a comparatively lower static pressure than downstream therefrom, the perforation (14) forming an acoustic connection between the interior of the conduit (10) and the surrounding atmosphere.
2. The apparatus as recited in claim 1 , wherein the lower static pressure in the vicinity of the perforation (14) is brought about by means of a reduction in the cross section of the conduit.
3. The apparatus as recited in claim 2 , wherein the reduction in the cross section of the conduit (14) is designed as a venturi.
4. The apparatus as recited in claim 2 , wherein the pipe portion (10 a) designed as a venturi is covered on the outside with a sound-absorbing material.
5. The apparatus as recited in claim 4 , wherein the sound-absorbing material is covered by a perforated plate (17).
6. The apparatus as recited in claim 1 , wherein the lower static pressure in the vicinity of the perforation (14) is brought about by means of a change in direction of the gas flow in the conduit.
7. The apparatus as recited in claim 6 , wherein the change in direction of the gas flow is brought about by means of a curve of the conduit.
8. The apparatus as recited in claim 1 , wherein the perforations (14) are covered by means of a sound-permeable fabric (20) on the inside or outside of the conduit (10).
9. A method for affecting acoustic attenuation of resonant exhaust noise produced by a combustion engine, said method comprising:
providing a combustion engine with an exhaust conduit having a length that causes a high magnitude resonant acoustic sound to be experienced in the exhaust conduit as the combustion engine passes through an exhaust resonance producing speed range; and
attenuating the magnitude of the high magnitude resonant acoustic sound at an outlet of the exhaust conduit by causing at least a portion of the high magnitude resonant acoustic sound to diffuse outside the exhaust conduit upstream of the outlet.
10. The method as recited in claim 9 , further comprising:
providing at least one aperture along the length of the exhaust conduit and arranging the aperture so that at least a portion of the high magnitude resonant acoustic sound diffuses therethrough.
11. The method as recited in claim 10 , further comprising:
locating the at least one aperture at a position along the length of the exhaust conduit where a negative pressure is normally developed inside the conduit in comparison to ambient pressure outside the conduit.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0100585A SE522546C2 (en) | 2001-02-21 | 2001-02-21 | Device for attenuating resonance in a pipeline |
SE0100585-9 | 2001-02-21 | ||
PCT/SE2002/000260 WO2002066798A1 (en) | 2001-02-21 | 2002-02-14 | Apparatus for damping resonance in a conduit |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2002/000260 Continuation WO2002066798A1 (en) | 2001-02-21 | 2002-02-14 | Apparatus for damping resonance in a conduit |
Publications (1)
Publication Number | Publication Date |
---|---|
US20040104071A1 true US20040104071A1 (en) | 2004-06-03 |
Family
ID=20283074
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/604,848 Abandoned US20040104071A1 (en) | 2001-02-21 | 2003-08-21 | Apparatus for damping resonance in a conduit |
Country Status (6)
Country | Link |
---|---|
US (1) | US20040104071A1 (en) |
EP (1) | EP1373689A1 (en) |
JP (1) | JP4159032B2 (en) |
BR (1) | BR0207389A (en) |
SE (1) | SE522546C2 (en) |
WO (1) | WO2002066798A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080135330A1 (en) * | 2005-02-16 | 2008-06-12 | Woco Industrietechnik Gmbh | Sonic Coupling Between An Intake Tract Or Engine Compartment And The Interior Of A Motor Vehicle |
US20090057056A1 (en) * | 2007-08-31 | 2009-03-05 | Fred Baumgartner | Vehicular exhaust resonator with cooling feature |
US9523304B2 (en) | 2013-03-11 | 2016-12-20 | Futaba Industrial Co., Ltd. | Exhaust pipe |
CN113202596A (en) * | 2020-02-03 | 2021-08-03 | 佛吉亚排放控制技术美国有限公司 | Exhaust system component |
US11225897B2 (en) * | 2019-07-23 | 2022-01-18 | Tenneco Automotive Operating Company Inc. | Vehicle exhaust system |
WO2022240596A1 (en) * | 2021-05-12 | 2022-11-17 | Tenneco Automotive Operating Company Inc. | Surface component for vehicle exhaust system |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1524415A1 (en) * | 2003-10-15 | 2005-04-20 | Zeuna-Stärker Gmbh & Co Kg | Exhaust silencer |
JP2008151413A (en) * | 2006-12-18 | 2008-07-03 | Kumagai Gumi Co Ltd | Duct component |
ITTO20070529A1 (en) * | 2007-07-17 | 2009-01-18 | Metallurg Cornaglia Sp A Off | SILENCER DEVICE FOR A CONDUCT TO BE TRAVELED BY A FLUID AND ITS METHOD OF REALIZATION. |
DE102015218394A1 (en) | 2015-09-24 | 2017-03-30 | Volkswagen Aktiengesellschaft | Device for preventing whistling in gas-flow systems with perforated sections |
Citations (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1611475A (en) * | 1922-03-23 | 1926-12-21 | Maxim Silencer Co | Silencer |
US2013956A (en) * | 1931-11-16 | 1935-09-10 | Laurence R Heath | Muffler |
US2241150A (en) * | 1940-01-27 | 1941-05-06 | Reese F Morgan | Exhaust muffler |
US2248456A (en) * | 1938-08-19 | 1941-07-08 | Harris Eliot Huntington | Muffling and cooling device for internal combustion engines |
US3471265A (en) * | 1965-01-27 | 1969-10-07 | Grace W R & Co | Catalytic muffler device |
US3592292A (en) * | 1970-06-24 | 1971-07-13 | James H Lavallee | Tailpipe extension silencer with venturi air extrainment |
US3611724A (en) * | 1970-01-07 | 1971-10-12 | Gen Electric | Choked inlet noise suppression device for a turbofan engine |
US3865212A (en) * | 1973-12-14 | 1975-02-11 | Hugh C Mcdonald | Surveillance aircraft muffler |
US3899923A (en) * | 1971-05-13 | 1975-08-19 | Teller Environmental Systems | Test process and apparatus for treatment of jet engine exhaust |
US4024698A (en) * | 1976-07-16 | 1977-05-24 | Allied Chemical Corporation | Aspirator muffler |
US4298153A (en) * | 1980-05-07 | 1981-11-03 | Allied Corporation | Interfloor tube aspirator inlet muffler |
US4371053A (en) * | 1980-03-17 | 1983-02-01 | Hills Industrie Limited | Perforate tube muffler |
US4690245A (en) * | 1983-03-17 | 1987-09-01 | Stemco, Inc. | Flattened venturi, method and apparatus for making |
US4832150A (en) * | 1986-07-28 | 1989-05-23 | Gunter Just | Sound-permeable cover for a loudspeaker |
US4926638A (en) * | 1987-12-03 | 1990-05-22 | Yoshiaki Kakuta | Negative pressure air stream accelerator of suction type air cooling mechanism for internal combustion engine |
US5197509A (en) * | 1990-06-06 | 1993-03-30 | Cheng Dah Y | Laminar flow elbow system and method |
US5550334A (en) * | 1991-10-30 | 1996-08-27 | Noise Cancellation Technologies, Inc. | Actively sound reduced muffler having a venturi effect configuration |
US5857327A (en) * | 1996-06-21 | 1999-01-12 | Kioritz Corporation | Muffler for an internal combustion engine |
US5881554A (en) * | 1998-03-23 | 1999-03-16 | Ford Global Technologies, Inc. | Integrated manifold, muffler, and catalyst device |
US20020117581A1 (en) * | 2000-09-26 | 2002-08-29 | Sanders Bobby W. | Low sonic boom inlet for supersonic aircraft |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR988370A (en) * | 1949-04-08 | 1951-08-27 | Exhaust | |
DE19629368A1 (en) * | 1996-07-20 | 1998-01-22 | Gillet Heinrich Gmbh | Resonance damper for motor vehicle exhaust pipe |
-
2001
- 2001-02-21 SE SE0100585A patent/SE522546C2/en not_active IP Right Cessation
-
2002
- 2002-02-14 EP EP02711615A patent/EP1373689A1/en not_active Withdrawn
- 2002-02-14 BR BR0207389-7A patent/BR0207389A/en not_active Application Discontinuation
- 2002-02-14 WO PCT/SE2002/000260 patent/WO2002066798A1/en not_active Application Discontinuation
- 2002-02-14 JP JP2002566090A patent/JP4159032B2/en not_active Expired - Fee Related
-
2003
- 2003-08-21 US US10/604,848 patent/US20040104071A1/en not_active Abandoned
Patent Citations (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1611475A (en) * | 1922-03-23 | 1926-12-21 | Maxim Silencer Co | Silencer |
US2013956A (en) * | 1931-11-16 | 1935-09-10 | Laurence R Heath | Muffler |
US2248456A (en) * | 1938-08-19 | 1941-07-08 | Harris Eliot Huntington | Muffling and cooling device for internal combustion engines |
US2241150A (en) * | 1940-01-27 | 1941-05-06 | Reese F Morgan | Exhaust muffler |
US3471265A (en) * | 1965-01-27 | 1969-10-07 | Grace W R & Co | Catalytic muffler device |
US3611724A (en) * | 1970-01-07 | 1971-10-12 | Gen Electric | Choked inlet noise suppression device for a turbofan engine |
US3592292A (en) * | 1970-06-24 | 1971-07-13 | James H Lavallee | Tailpipe extension silencer with venturi air extrainment |
US3899923A (en) * | 1971-05-13 | 1975-08-19 | Teller Environmental Systems | Test process and apparatus for treatment of jet engine exhaust |
US3865212A (en) * | 1973-12-14 | 1975-02-11 | Hugh C Mcdonald | Surveillance aircraft muffler |
US4024698A (en) * | 1976-07-16 | 1977-05-24 | Allied Chemical Corporation | Aspirator muffler |
US4371053A (en) * | 1980-03-17 | 1983-02-01 | Hills Industrie Limited | Perforate tube muffler |
US4298153A (en) * | 1980-05-07 | 1981-11-03 | Allied Corporation | Interfloor tube aspirator inlet muffler |
US4690245A (en) * | 1983-03-17 | 1987-09-01 | Stemco, Inc. | Flattened venturi, method and apparatus for making |
US4832150A (en) * | 1986-07-28 | 1989-05-23 | Gunter Just | Sound-permeable cover for a loudspeaker |
US4926638A (en) * | 1987-12-03 | 1990-05-22 | Yoshiaki Kakuta | Negative pressure air stream accelerator of suction type air cooling mechanism for internal combustion engine |
US5197509A (en) * | 1990-06-06 | 1993-03-30 | Cheng Dah Y | Laminar flow elbow system and method |
US5550334A (en) * | 1991-10-30 | 1996-08-27 | Noise Cancellation Technologies, Inc. | Actively sound reduced muffler having a venturi effect configuration |
US5857327A (en) * | 1996-06-21 | 1999-01-12 | Kioritz Corporation | Muffler for an internal combustion engine |
US5881554A (en) * | 1998-03-23 | 1999-03-16 | Ford Global Technologies, Inc. | Integrated manifold, muffler, and catalyst device |
US20020117581A1 (en) * | 2000-09-26 | 2002-08-29 | Sanders Bobby W. | Low sonic boom inlet for supersonic aircraft |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080135330A1 (en) * | 2005-02-16 | 2008-06-12 | Woco Industrietechnik Gmbh | Sonic Coupling Between An Intake Tract Or Engine Compartment And The Interior Of A Motor Vehicle |
US7487857B2 (en) * | 2005-02-16 | 2009-02-10 | Woco Industrietchnik Gmbh | Sonic coupling between an intake tract or engine compartment and the interior of a motor vehicle |
US20090057056A1 (en) * | 2007-08-31 | 2009-03-05 | Fred Baumgartner | Vehicular exhaust resonator with cooling feature |
US7845465B2 (en) * | 2007-08-31 | 2010-12-07 | Tenneco Automotive Operating Company Inc. | Vehicular exhaust resonator with cooling feature |
US9523304B2 (en) | 2013-03-11 | 2016-12-20 | Futaba Industrial Co., Ltd. | Exhaust pipe |
US11225897B2 (en) * | 2019-07-23 | 2022-01-18 | Tenneco Automotive Operating Company Inc. | Vehicle exhaust system |
US11614009B2 (en) | 2019-07-23 | 2023-03-28 | Tenneco Automotive Operating Company Inc. | Vehicle exhaust system |
CN113202596A (en) * | 2020-02-03 | 2021-08-03 | 佛吉亚排放控制技术美国有限公司 | Exhaust system component |
US11603781B2 (en) * | 2020-02-03 | 2023-03-14 | Faurecia Emissions Control Technologies, Usa, Llc | Exhaust system component |
WO2022240596A1 (en) * | 2021-05-12 | 2022-11-17 | Tenneco Automotive Operating Company Inc. | Surface component for vehicle exhaust system |
US11808186B2 (en) | 2021-05-12 | 2023-11-07 | Tenneco Automotive Operating Company Inc. | Surface component for vehicle exhaust system |
Also Published As
Publication number | Publication date |
---|---|
JP4159032B2 (en) | 2008-10-01 |
WO2002066798A1 (en) | 2002-08-29 |
EP1373689A1 (en) | 2004-01-02 |
SE0100585D0 (en) | 2001-02-21 |
BR0207389A (en) | 2004-02-10 |
SE522546C2 (en) | 2004-02-17 |
JP2004519575A (en) | 2004-07-02 |
SE0100585L (en) | 2002-08-22 |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: VOLVO LASTVAGNAR AB, SWEDEN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WAHLSTROM, GERT-OVE;HENRIKSSON, BJORN;REEL/FRAME:013891/0548 Effective date: 20030804 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |