US3752260A - Air rush silencer - Google Patents

Air rush silencer Download PDF

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Publication number
US3752260A
US3752260A US3752260DA US3752260A US 3752260 A US3752260 A US 3752260A US 3752260D A US3752260D A US 3752260DA US 3752260 A US3752260 A US 3752260A
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Prior art keywords
tube
housing
gas
outlet
annular passage
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Expired - Lifetime
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R Heath
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Tenneco Inc
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Tenneco Inc
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust 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
    • F01N13/02Exhaust 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 having two or more separate silencers in series
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00Silencing apparatus characterised by method of silencing
    • F01N1/08Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling

Abstract

A silencer for the end of an internal combustion engine exhaust system comprises a perforated open end gas flow tube inside of an imperforate open end shell, the tube having restrictive means in it to force gas to flow through the perforations.

Description

Unite States Patent 11 1 1111 3,752,260 Heath Aug. 14, 1973 AIR RUSH SILENCER 3,429,397 2/1969 Case 181/36 B [75] Inventor: Robert A. Heath,Jackson, Mich. FOREIGN PATENTS OR APPLICATIONS 1,157,254 12/1957 France 181/57 [73] Assgnee' Tenneco Racmewls' 387,113 2 1933 Great Britain 181/57 [22] Flledi July 15, 1971 751,881 7/1956 Great Britain 181/36 B [21] Appl L959 Primary Examiner-Richard B. Wilkinson Assistant Examiner-John F. Gonzales 52 us. (:1 181/47 R, 181/57, 18/72 A y King Harness er [51] Int. Cl. F01n 1/00 [58] Field Of Search 181/36 R, 36 B, 35 C, [57] ABSTRACT 18 44 A silencer for the end of an internal combustion engine exhaust system comprises a perforated open end gas References Cited flow tube inside of an imperforate open end shell, the UNITED STATES PATENTS tube having restrictive means in it to force gas to flow 3,209,861 10/1965 Whitney 181/63 thmugh the perforatins- 3,404,750 10/1968 Powers et a1. 181/72 4 Claims, 4 Drawing Figures 2,047,443 7/1936 Starkweather et al. 181/35 C fit Paiented Aug. 14, 1973 3,752,260

INVENTOR.

AIR RUSH SILENCER BRIEF SUMMARY OF THE INVENTION It is the purpose of this invention to provide a means to attenuate air rush noise in an internal combustion engine exhaust system.

The invention accomplishes this purpose by means of a combination silencer and tailpipe spout wherein the flowing gas is forced by restriction means into two flow streams that impinge upon a curved wall prior to reaching the silencer outlet.

DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic side elevation of an internal combustion engine exhaust system having a silencer in accordance with the invention;

FIG. 2 is an enlarged longitudinal cross section through a silencer as used in the system of FIG. 1 that embodies the invention;

FIG. 3 is a cross section along the line 3-3 of FIG. 2; and

FIG. 4 is a cross section along the line 4-4 of FIG. 2.

DESCRIPTION OF THE INVENTION The automobile 1 has an internal combustion engine 3 with an exhaust manifold 5 that discharges exhaust gas into an exhaust system 7 that comprises an exhaust pipe 9 to carry gas to a muffler 11 from which, after silencing of engine generated sound, the gas flows through tailpipe 13 to a silencer l5 and then to atmosphere. The silencer 15 embodies the present invention and is intended to attenuate air rush noise, that is the sound generated by the high velocity exhaust gases which would otherwise enter the atmosphere at the end of the tailpipe 13.

The silencer 15 comprises a housing or imperforate outer shell 17, of circular cross section, which is reduced in diameter at its upstream end to form an inlet bushing 19 which receives the end of the tailpipe 13 and may be clamped to it. Supported in and spotwelded to the bushing 19 is a straight through gas flow tube 21 that is preferably the same size as the tailpipe 13, the downstream end of the tube being supported by dimples 22 in the shell 17. The tube 21 is fully open at its inlet and outlet ends 23 and 25 but is reduced in diameter between its ends at cross section 27 to form a restriction means located along the length of tube 21. The restriction may be formed by means of four U- shaped pinch sections 29 as indicated in FIG. 3. The portion of the wall of tube 21 that is upstream of restrictor section 27 is perforated, preferably by means of a louver patch 31 of sufficient area to prevent excessive back pressure; and the portion of the wall of tube 21 that is downstream of restrictor section 27 is perforated, preferably by means of a louver patch 33.

The downstream end of the housing 17 is fully open as seen at 35. However, the end portion extends a substantial distance beyond the end of tube 21 and the housing is curved or bent downward to the axis of tube 21 as seen at 37. This provides an interior wall section 39 that is in alignment with a substantial portion of the cross sectional area of tube 21 and the annular passage 41 between the tube 21 and the inner surface of housing 17. It also defines, in part, a common empty outlet chamber 43 in housing 17 for gas leaving annular passage 41 and the end 25 of tube 21.

In operation, gas reaching the tailpipe 13 has had much of the engine generated sound removed. If permitted to discharge directly into atmosphere at the outlet end of tailpipe 13 (i.e., the normal outlet for the system 7), there is often an audible high frequency sound due to the velocity of the gas entering the atmosphere. The source of this sound is considered to be somewhat beyond the end of the tailpipe. By the addition of the silencer 15 the source is located within the tube 21. The restriction 27 forces some of the gas to flow through the resistive louver patch into the compliant annular passage 41. Pressure differentials also cause some of the gas to flow out of louver patch 33 into passage 41. The gas in passage 41 is colder and slower than the gas leaving outlet 25 of tube 21 so that there is a moving cold stream of gas around a moving hot stream. This relationship plus the effect of chamber 43 and reflection off wall 39 create a turbulence between the outer and inner gas streams to slow down the jet stream in tube 21 and attenuate the air rush noise. This is done without any harmful increase in back pressure.

Modifications may be made in the specific structure shown without departing from the spirit and scope of the invention.

I claim:

1. A muffler for attenuating air rush noise in an exhaust gas system for an internal combustion engine, said system including an outlet, comprising a housing having a reduced size inlet for attachment to said outlet, a straight through gas flow tube supported in the housing to receive all gas from said inlet, said tube and housing defining an annular passage surrounding the tube, said tube and said annular passage having transversely separated outlets inside said housing with the annular passage outlet surrounding the tube outlet and both outlets spaced axially upstream from the downstream end of the housing, said tube having a reduced cross section portion therein located a substantial distance upstream from its outlet providing a restriction to gas flow through the tube, said tube having a perforated wall upstream of the restriction and the restriction forcing some gas to flow through the perforations in said wall into the annular passage whereby the gas flows in two separate parallel streams in said housing, said housing having an open downstream and extending across substantially the full and largest cross section of the housing and a curved wall portion axially aligned with and spaced downstream from the outlet of the tube whereby gas in said separate streams impinges upon said curved wall portion prior to passing out of said open downstream end.

2. A muffler as set forth in claim 1 wherein said restriction is centrally located in said tube, said tube having a perforated wall portion located downstream of the restriction with the perforations opening into the annular passage.

3. In an exhaust gas system for an internal combustion engine, said system including an outlet, a muffler for attenuating air rush noise out of said outlet comprising a housing having a reduced size inlet attached to said outlet, a straight through gas flow tube supported in the housing to receive all gas from said inlet, said tube and housing defining an annular passage surrounding the tube and defining two separate gas flow streams in the housing, said tube and said annular passage having a common outlet chamber for said separate said tube both upstream and downstream of the restriction being perforated and the perforations opening into said annular passage to provide for flow of some of the gas from the tube into the annular passage.

4. A muffler as set forth in claim 3 wherein said perforations are provided by louvers in the tube.

Claims (4)

1. A muffler for attenuating air rush noise in an exhaust gas system for an internal combustion engine, said system including an outlet, comprising a housing having a reduced size inlet for attachment to said outlet, a straight through gas flow tube supported in the housing to receive all gas from said inlet, said tube and housing defining an annular passage surrounding the tube, said tube and said annular passage having transversely separated outlets inside said housing with the annular passage outlet surrounding the tube outlet and both outlets spaced axially upstream from the downstream end of the housing, said tube having a reduced cross section portion therein providing a restriction to gas flow through the tube, said tube having a perforated wall upstream of the restriction and the restriction forcing some gas to flow through the perforations in said wall into the annular passage whereby the gas flows in two separate parallel streams in said housing, said housing having an open downstream end extending across substantially the full and largest cross section of the housing and a curved wall portion axially aligned with and spaced downstream from the outlet of the tube whereby gas in said separate streams impinges upon said curved wall portion prior to passing out of said open downstream end.
2. A muffler as set forth in claim 1 wherein said restriction is centrally located in said tube, said tube having a perforated wall portion located downstream of the restriction with the perforations opening into the annular passage.
3. In an exhaust gas system for an internal combustion engine, said system including an outlet, a muffler for attenuating air rush noise out of said outlet comprising a housing having a reduced size inlet attached to said outlet, a straight through gas flow tube supported in the housing to receive all gas from said inlet, said tube and housing defining an annular passage surrounding the tube and defining two separate gas flow streams in the housing, said tube and said annular passage having a common outlet chamber for said separate gas streams inside said housing, said chamber being substantially the full and largest cross sectional area of the housing and extending to the downstream end of the housing and said downstream end being open to atmosphere across substantially the full and largest cross sectional area of the housing, said tube having a centrally located reduced cross section therein providing a restriction to gas flow through the tube, the wall of said tube both upstream and downstream of the restriction being perforated and the perforations opening into said annular passage to provide for flow of some of the gas from the tube into the annular passage.
4. A muffler as set forth in claim 3 wherein said perforations are provided by louvers in the tube.
US3752260A 1971-07-15 1971-07-15 Air rush silencer Expired - Lifetime US3752260A (en)

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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4111278A (en) * 1977-02-09 1978-09-05 Copeland Corporation Discharge muffler
US4264239A (en) * 1975-10-14 1981-04-28 King-Seeley Thermos Co. Ice transport and dispensing system
US4589515A (en) * 1984-02-08 1986-05-20 Nissan Motor Company, Limited Exhaust tail pipe arrangement
US4596306A (en) * 1983-04-12 1986-06-24 Nissan Motor Co., Ltd. Exhaust silencing system
US4705138A (en) * 1985-12-24 1987-11-10 The Dow Chemical Company Steam trap muffler
US5449866A (en) * 1991-11-26 1995-09-12 Ab Volvo Arrangement for damping sound in a pipe system
US6112850A (en) * 1999-09-07 2000-09-05 Met Pro Corporation Acoustic silencer nozzle
US6213251B1 (en) * 1997-09-24 2001-04-10 Stephen H. Kesselring Self-tuning exhaust muffler
US6336471B1 (en) * 1981-07-16 2002-01-08 James J. Feuling Flow system for enhancing undirectional fluid flow
US6591935B1 (en) * 2000-07-17 2003-07-15 Gary L. Petley ATV stealth exhaust system
US20050279572A1 (en) * 2004-06-17 2005-12-22 Lars Birgersson Arrangement for internal combustion engine
US7007720B1 (en) * 2000-04-04 2006-03-07 Lacks Industries, Inc. Exhaust tip
US20080000718A1 (en) * 2006-05-30 2008-01-03 Honda Motor Co., Ltd. Muffler structure
US20080099276A1 (en) * 2006-11-01 2008-05-01 Freightliner Llc Exhaust diffuser for vehicle
US20090090101A1 (en) * 2006-04-04 2009-04-09 Soo Won Kim Exhaust Gas-Discharging Device of Vehicle
US20100212767A1 (en) * 2009-02-25 2010-08-26 Nissan Technical Center North America, Inc. Exhaust Finisher Retention Operation
US20100236226A1 (en) * 2009-03-19 2010-09-23 Goodman Ball, Inc. Exhaust system and method for an internal combustion engine and a generator set utilizing same
US20110048847A1 (en) * 2009-09-02 2011-03-03 United States Of America As Represented By The Secretary Of The Navy Noise attenuation device for reducing noise attenuation in a jet engine test cell
US7918310B1 (en) * 2009-09-02 2011-04-05 The United States Of America As Represented By The Secretary Of The Navy Noise attenuation device for reducing jet engine noise during testing
US20140110009A1 (en) * 2012-10-23 2014-04-24 Neill A. Quinlan Vehicle exhaust tip assembly
US20160053642A1 (en) * 2013-04-15 2016-02-25 Nichias Corporation Muffler cutter

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB387113A (en) * 1932-01-22 1933-02-02 Norton Motors Ltd Improvements in or relating to silencers for internal combustion engines
US2047443A (en) * 1936-03-09 1936-07-14 Buffalo Pressed Steel Company Muffler
GB751881A (en) * 1953-03-24 1956-07-04 Vladimir Jansa An arrangement of the exhaust system for internal combustion engines, more particularly for motor cycles
FR1157254A (en) * 1956-08-13 1958-05-28 Improvements to the exhaust systems of engines combustioninterne
US3209861A (en) * 1963-10-28 1965-10-05 Walker Mfg Co Muffler with two longitudinally separated chambers
US3404750A (en) * 1966-07-14 1968-10-08 Walker Mfg Co Combination tailpipe spout and silencer
US3429397A (en) * 1967-09-26 1969-02-25 Walker Mfg Co Laminated conduit and acoustic silencer

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB387113A (en) * 1932-01-22 1933-02-02 Norton Motors Ltd Improvements in or relating to silencers for internal combustion engines
US2047443A (en) * 1936-03-09 1936-07-14 Buffalo Pressed Steel Company Muffler
GB751881A (en) * 1953-03-24 1956-07-04 Vladimir Jansa An arrangement of the exhaust system for internal combustion engines, more particularly for motor cycles
FR1157254A (en) * 1956-08-13 1958-05-28 Improvements to the exhaust systems of engines combustioninterne
US3209861A (en) * 1963-10-28 1965-10-05 Walker Mfg Co Muffler with two longitudinally separated chambers
US3404750A (en) * 1966-07-14 1968-10-08 Walker Mfg Co Combination tailpipe spout and silencer
US3429397A (en) * 1967-09-26 1969-02-25 Walker Mfg Co Laminated conduit and acoustic silencer

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4264239A (en) * 1975-10-14 1981-04-28 King-Seeley Thermos Co. Ice transport and dispensing system
US4111278A (en) * 1977-02-09 1978-09-05 Copeland Corporation Discharge muffler
US6336471B1 (en) * 1981-07-16 2002-01-08 James J. Feuling Flow system for enhancing undirectional fluid flow
US4596306A (en) * 1983-04-12 1986-06-24 Nissan Motor Co., Ltd. Exhaust silencing system
US4589515A (en) * 1984-02-08 1986-05-20 Nissan Motor Company, Limited Exhaust tail pipe arrangement
US4705138A (en) * 1985-12-24 1987-11-10 The Dow Chemical Company Steam trap muffler
US5449866A (en) * 1991-11-26 1995-09-12 Ab Volvo Arrangement for damping sound in a pipe system
US6213251B1 (en) * 1997-09-24 2001-04-10 Stephen H. Kesselring Self-tuning exhaust muffler
US6112850A (en) * 1999-09-07 2000-09-05 Met Pro Corporation Acoustic silencer nozzle
US7007720B1 (en) * 2000-04-04 2006-03-07 Lacks Industries, Inc. Exhaust tip
US6591935B1 (en) * 2000-07-17 2003-07-15 Gary L. Petley ATV stealth exhaust system
US20050279572A1 (en) * 2004-06-17 2005-12-22 Lars Birgersson Arrangement for internal combustion engine
US20090090101A1 (en) * 2006-04-04 2009-04-09 Soo Won Kim Exhaust Gas-Discharging Device of Vehicle
US7735602B2 (en) * 2006-05-30 2010-06-15 Honda Motor Co., Ltd. Muffler structure
US20080000718A1 (en) * 2006-05-30 2008-01-03 Honda Motor Co., Ltd. Muffler structure
US7604093B2 (en) * 2006-11-01 2009-10-20 Daimler Trucks North America Llc Exhaust diffuser for vehicle
US20080099276A1 (en) * 2006-11-01 2008-05-01 Freightliner Llc Exhaust diffuser for vehicle
US20100212767A1 (en) * 2009-02-25 2010-08-26 Nissan Technical Center North America, Inc. Exhaust Finisher Retention Operation
US8550122B2 (en) * 2009-02-25 2013-10-08 Nissan North America, Inc. Exhaust finisher retention operation
US20100236226A1 (en) * 2009-03-19 2010-09-23 Goodman Ball, Inc. Exhaust system and method for an internal combustion engine and a generator set utilizing same
US20110048847A1 (en) * 2009-09-02 2011-03-03 United States Of America As Represented By The Secretary Of The Navy Noise attenuation device for reducing noise attenuation in a jet engine test cell
US7918310B1 (en) * 2009-09-02 2011-04-05 The United States Of America As Represented By The Secretary Of The Navy Noise attenuation device for reducing jet engine noise during testing
US20140110009A1 (en) * 2012-10-23 2014-04-24 Neill A. Quinlan Vehicle exhaust tip assembly
US9157556B2 (en) * 2012-10-23 2015-10-13 Fca Us Llc Vehicle exhaust tip assembly
US20160053642A1 (en) * 2013-04-15 2016-02-25 Nichias Corporation Muffler cutter
US9810117B2 (en) * 2013-04-15 2017-11-07 Nichias Corporation Muffler cutter

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