US20050155819A1 - Anti-reversion apparatus - Google Patents

Anti-reversion apparatus Download PDF

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Publication number
US20050155819A1
US20050155819A1 US10/780,648 US78064804A US2005155819A1 US 20050155819 A1 US20050155819 A1 US 20050155819A1 US 78064804 A US78064804 A US 78064804A US 2005155819 A1 US2005155819 A1 US 2005155819A1
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US
United States
Prior art keywords
conduit
reversionary
gas flow
inner pipe
annular wall
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
Application number
US10/780,648
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English (en)
Inventor
Kelly Libby
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of US20050155819A1 publication Critical patent/US20050155819A1/en
Abandoned legal-status Critical Current

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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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B27/00—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues
    • F02B27/005—Oscillating pipes with charging achieved by arrangement, dimensions or shapes of intakes pipes or chambers; Ram air pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B27/00—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues
    • F02B27/04—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues in exhaust systems only, e.g. for sucking-off combustion gases
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10019—Means upstream of the fuel injection system, carburettor or plenum chamber
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
    • F02M35/10118—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements with variable cross-sections of intake ducts along their length; Venturis; Diffusers
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1205—Flow throttling or guiding
    • F02M35/1211—Flow throttling or guiding by using inserts in the air intake flow path, e.g. baffles, throttles or orifices; Flow guides
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1205—Flow throttling or guiding
    • F02M35/1216—Flow throttling or guiding by using a plurality of holes, slits, protrusions, perforations, ribs or the like; Surface structures; Turbulence generators
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to apparatus for affecting reversionary flow characteristics in an internal combustion engine. More particularly, a device is located in the intake or exhaust of an engine for influencing gas and sound waves for improving engine performance.
  • Intake and exhaust gas flow in an internal combustion engine is a complex combination of pulsing high pressure and low pressure gas flows and sound waves related to the cyclical action of pistons and the intake and exhaust valves of the internal combustion engine.
  • the interaction of the various flows can affect engine efficiency.
  • the gases are routed through intake and exhaust systems primarily comprising a tubular conduit arranged to feed gases to the engine (intake) and extract gases from the engine (exhaust). Performance is related in part to the size of the conduit and the characteristics of the flow therethrough.
  • the gas flow includes longitudinally propagated sound waves which can aid or interfere with gas flow. Through interaction of the gas flow and sound waves it is possible to suffer a reverse gas flow with an associated reduction in engine performance.
  • An anti-reversionary device is provided for positioning in the intake or the exhaust conduit of an internal combustion, preferably substantially adjacent the cylinder head of the engine.
  • the anti-reversionary device is adapted to a conduit having gas flow therethrough comprising: an inner pipe is positioned substantially concentrically within the conduit; and an annular wall extending between the pipe and the conduit, the inner pipe having a tubular gas inlet projecting upstream from the annular wall for separating the gas flow into a annular gas flow and a central gas flow, the central gas flow being faster than the annular gas flow at the tubular gas inlet, the annular wall having a plurality of ports formed therein and about the inner pipe, the ports forming passages directed radially inward and downstream for accelerating the annular gas flow for discharge into the central gas flow.
  • the annular wall itself is angled downstream from the inner pipe to the conduit.
  • the inner pipe is suspended in a tubular housing by the annular wall, the tubular housing being adapted to fit into the conduit.
  • FIG. 1 is a partial cross-sectional view of a gas flow conduit with a perspective view of an anti-reversionary device of one embodiment of the invention fit therein;
  • FIG. 2 is a cross-sectional end view of the conduit and anti-reversionary device according to FIG. 1 , viewed from the upstream side of the device;
  • FIG. 3 is a partial section, cross-sectional view of one embodiment of the device of FIG. 1 detailing the inner pipe, one of a plurality of annular wall ports and the gas flow therethrough;
  • FIG. 4 is a cross sectional view of a plurality of devices fit into a conduit
  • FIGS. 5 a - 5 c illustrate computer-generated flow simulations with and without an anti-reversionary device of the present invention, more particularly,
  • FIG. 5 a depicts the prior art conventional case of the flow velocity of gas in a conduit without the device
  • FIG. 5 b illustrated a form of anti-reversionary device which is modeled in FIG. 5 c ;
  • FIG. 5 c depicts the flow velocity of gas with the device of FIG. 5 b.
  • the anti-reversionary device of the current invention is adaptable to either intake or exhaust system of an engine, both of which are subject to the pulsating gas flow and sound waves inherent in a valved, internal combustion engine.
  • the device is been described in the context of application to an exhaust system.
  • the intake, combustion and exhaust cycles of an internal combustion engine produce pulsating gas flows.
  • the products of combustion are typically expelled at about 300-800 feet per minute.
  • Sound waves of the combustion process can travel at a nominal 1500-1800 feet per second.
  • the faster sound waves can form a partial vacuum zone into which the slower gas flow can be drawn, resulting in reversion. As known, reversion is detrimental to engine performance.
  • flow through a conduit is typified by a faster flow in a center flow stream and slower flow along the conduit wall; the boundary layer flow.
  • the velocity adjacent the wall is slower than the velocity at the center, according to the well known velocity provided in a pipe.
  • the characteristics of pipe flow are used to advantage in the present invention.
  • FIGS. 1 and 3 one embodiment of an anti-reversionary device 10 for installation into the bore 11 of a conduit 12 comprising an inner pipe 13 supported substantially concentrically in the bore 11 is shown.
  • the conduit 12 is connected to an internal combustion engine (not shown). Gas flow adjacent the center of the conduit 12 passes though the inner pipe 13 .
  • An annular wall 14 extends between the conduit 12 and the inner pipe 13 .
  • the inner pipe 13 has a tubular inlet 15 which extends upstream of the annular wall 14 for separating the gas flow 13 into a slower annular flow 16 adjacent the conduit 12 and a faster gas flow 17 more central to the conduit.
  • the annular wall 14 may be affixed directly to the conduit 12 .
  • the annular wall 14 may be integral with a cylindrical housing 18 forming a unitary body or device 10 , the housing 18 being sized to fit the bore 11 of the conduit 12 .
  • Such as device is readily formed of sheet materials such as those having a substantially uniform wall thickness.
  • annular wall 14 may be angled, forming a truncated cone. As shown in FIG. 1 , One embodiment finds the annular wall angled downstream and radially outwardly from the inner pipe 13 to the conduit 12 .
  • a plurality of ports 20 are formed in the annular wall 14 for the admitting slower gas flow 16 adjacent the conduit 12 upstream of the device 10 and directed discharge through passages 21 (best seen in FIG. 3 ) through the annular wall 14 to the conduit 12 downstream of the device 10 .
  • the total cross sectional area of the passages 21 is somewhat less than the cross sectional area of the annular wall 14 .
  • One approach is to maximize the cross-sectional area of the passages 21 within the capability of conventional manufacturing techniques for the material of the wall 14 .
  • Slower annular gas flow 16 is accelerated through the passages 21 to rejoin the faster central gas 17 downstream of the device 10 .
  • the passages 21 can be angled somewhat to direct the annular gas flow 16 radially inwardly to the faster central flow 17 .
  • the ports 20 form passages 21 which are angled through the annular wall 14 .
  • the passages 21 are angled at about 20-30 degrees relative to the conduit 12 , and parallel to a conduit axis A. Ports, can be spaced at equi-distance circumferentially along the 360 degrees about the annular wall.
  • Twenty-four circular ports 20 could be spaced at 15 degrees apart with a port diameter commensurate to having some supporting annular wall 14 remaining between adjacent ports 20 .
  • twenty-four ports 20 could be spaced at about 14.3 degree increments and a twenty-fifth port 10 at 17 degrees; there not being a fixed requirement for specific spacing of ports.
  • one or more of the anti-reversionary devices 10 can be installed in a conduit 12 .
  • an anti-reversionary device 10 can be manufactured having a 1.5 OD tubular intake and a 1.37 inch ID.
  • a housing 18 is sized with a 1.88 inch OD to fit the bore 11 .
  • the tubular inlet 15 , inner pipe 13 , annular wall 14 and housing 18 typically have a ⁇ fraction (1/16) ⁇ inch wall thickness.
  • the inner pipe 13 can extend about 0.43 inches upstream of the annular wall 14 .
  • the dimensions in the present example create a clearance about the inner pipe 13 ; here being 0.25 inches measured between the respective ID's of the conduit 12 and the inner pipe. This clearance affects the slower annular boundary layer flow 16 adjacent the conduit 12 for directed discharge into the faster central flow 17 .
  • the annular wall is angled at about 45 degrees. Twenty-five ports 20 , each about 0.125 inches in diameter are formed in the annular wall 14 . Passages 21 are formed from each port 20 and through the annular wall 14 . In this example, the passages 21 are angled through the annular wall 14 at about 26 degrees.
  • FIGS. 5 a - 5 c one can see the effect on the velocity of the exhaust gas flow.
  • FIG. 5 a a computer simulation of the conventional pipe flow in a conduit 12 is illustrated, having the slower boundary layer flow 16 adjacent the conduit 12 and faster-and-faster flow as one approaches the center axis A.
  • the simulation work was performed on software entitled Ideal Flow Machine And Mapper developed by as provided by Virginia Tech, Department of Aerospace and Ocean Engineering, Blacksburg Va., USA and available at http://www.aoe.vt.edu/ ⁇ devenpor/aoe5104/ifm/ifminfo.html.
  • FIG. 5 c An anti-reversion device 10 of the present invention and as shown in FIG. 5 b , was installed into the conduit 12 . Once installed, a second computer simulation was performed, as illustrated in FIG. 5 c . which demonstrates an increase in velocity of the slower annular or boundary layer flow 16 to approach the faster central gas flow 17 . The acceleration of the slower annular flow 16 was achieved with little or no backpressure, typical of a standard venturi principle, and with a suppression of the environment which causes reversion.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
US10/780,648 2004-01-21 2004-02-19 Anti-reversion apparatus Abandoned US20050155819A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA2,455,485 2004-01-21
CA002455485A CA2455485A1 (fr) 2004-01-21 2004-01-21 Dispositif anti-retour

Publications (1)

Publication Number Publication Date
US20050155819A1 true US20050155819A1 (en) 2005-07-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
US10/780,648 Abandoned US20050155819A1 (en) 2004-01-21 2004-02-19 Anti-reversion apparatus

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CA (1) CA2455485A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140041370A1 (en) * 2012-08-08 2014-02-13 GM Global Technology Operations LLC Exhaust Treatment System for Internal Combustion Engine
WO2017148666A1 (fr) 2016-02-29 2017-09-08 Robert Bosch Gmbh Dispositif d'induction de fluide destiné à un moteur de véhicule
US20190085800A1 (en) * 2016-03-30 2019-03-21 Bueng Nam YOO Fluid accelerator for internal combustion enginge

Citations (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1685701A (en) * 1926-03-18 1928-09-25 Blanchard Joseph Exhaust-gas muffler for internal-combustion engines
US1876861A (en) * 1929-12-21 1932-09-13 John J Compo Muffler
US2065232A (en) * 1934-05-03 1936-12-22 Buffalo Pressed Steel Company Muffler
US2075316A (en) * 1933-11-21 1937-03-30 Carl Theodor Setterberg Silencer for internal combustion engines
US2150768A (en) * 1938-11-25 1939-03-14 Maremont Automotive Products I Muffler
US2624418A (en) * 1951-08-01 1953-01-06 Maxim Silencer Co Muffler with plural passages
US2708006A (en) * 1953-11-05 1955-05-10 Backman Hans Fredrik Muffler assembly for internal combustion engines
US2828830A (en) * 1956-10-08 1958-04-01 John C Clark Non-directional muffler
US2944623A (en) * 1955-09-02 1960-07-12 Jr Albert G Bodine Jet engine noise reducer
US3515242A (en) * 1969-09-05 1970-06-02 Alexander Tagg Ind Inc Exhaust silencer for internal combustion engines
US3648802A (en) * 1971-01-11 1972-03-14 Gen Motors Corp Gas flow baffle for wave interference silencing systems
US3888331A (en) * 1974-05-03 1975-06-10 Gen Motors Corp Power tuned wave interference silencer
US3888332A (en) * 1973-04-18 1975-06-10 Norton Villiers Ltd Exhaust silencers
US4050539A (en) * 1975-09-13 1977-09-27 Teruo Kashiwara Exhaust apparatus for internal combustion engine
US4167986A (en) * 1978-03-13 1979-09-18 Adco, Ltd. Fluid stream silencing device
US4206600A (en) * 1978-05-30 1980-06-10 Feuling James J Exhaust system for four-stroke internal combustion engines
US4222456A (en) * 1977-04-25 1980-09-16 Kasper Witold A Sound-suppressing and back pressure-reducing apparatus and method
US4339918A (en) * 1980-09-11 1982-07-20 Hirokuni Michikawa Means for accelerating the discharge of exhaust gas from an internal combustion engine
US4589515A (en) * 1984-02-08 1986-05-20 Nissan Motor Company, Limited Exhaust tail pipe arrangement
US4595073A (en) * 1984-05-14 1986-06-17 Nelson Industries Inc. Plug-type muffler section
US4841728A (en) * 1987-07-10 1989-06-27 Jyh-Jian Jean Straight through type muffler for generating the exhaust flow from an internal combustion engine
US4966253A (en) * 1989-08-23 1990-10-30 Howard Stephens Muffler device for exhaust systems
US5165231A (en) * 1990-07-16 1992-11-24 Rich Donald A Anti-reversion exhaust system
US5183976A (en) * 1991-11-26 1993-02-02 Plemons Jr R J Adjustable sound attenuating device
US5196653A (en) * 1991-05-20 1993-03-23 The United States Of America As Represented By The Secretary Of The Navy Muffler for air powered turbine drive
US5214253A (en) * 1990-10-26 1993-05-25 Houston Jr Richard G Automotive exhaust system
US5661272A (en) * 1995-01-27 1997-08-26 Iannetti; Francesco E. Engine noise reduction apparatus
US5824970A (en) * 1994-07-20 1998-10-20 Gracia; Albert Louis Marine engine silencer having internal apertured baffle and weir plate
US6024189A (en) * 1997-08-20 2000-02-15 Heuser; Stephen G. Noise attenuating apparatus
US6065459A (en) * 1997-05-15 2000-05-23 Lynn Diane Johnston Correct-a-flow radius turnaround anti-reversionary venturi pipes
US20020053483A1 (en) * 1999-03-30 2002-05-09 Gunther Ebinger Double-walled tail pipe for an exhaust pipe of a motor vehicle exhaust system
US6415887B1 (en) * 1999-11-26 2002-07-09 Cr Patents, Inc. Refractive wave muffler
US6467572B1 (en) * 2000-08-15 2002-10-22 Jefferson Liu Muffler
US6510921B2 (en) * 2001-02-19 2003-01-28 Samson Motorcycle Products, Inc. Muffler/exhaust extractor
US6564901B2 (en) * 2000-03-09 2003-05-20 Woodrow E. Woods Muffler for marine engine
US6588545B1 (en) * 1999-02-05 2003-07-08 Ok-no Lee Muffler for internal combustion engine

Patent Citations (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1685701A (en) * 1926-03-18 1928-09-25 Blanchard Joseph Exhaust-gas muffler for internal-combustion engines
US1876861A (en) * 1929-12-21 1932-09-13 John J Compo Muffler
US2075316A (en) * 1933-11-21 1937-03-30 Carl Theodor Setterberg Silencer for internal combustion engines
US2065232A (en) * 1934-05-03 1936-12-22 Buffalo Pressed Steel Company Muffler
US2150768A (en) * 1938-11-25 1939-03-14 Maremont Automotive Products I Muffler
US2624418A (en) * 1951-08-01 1953-01-06 Maxim Silencer Co Muffler with plural passages
US2708006A (en) * 1953-11-05 1955-05-10 Backman Hans Fredrik Muffler assembly for internal combustion engines
US2944623A (en) * 1955-09-02 1960-07-12 Jr Albert G Bodine Jet engine noise reducer
US2828830A (en) * 1956-10-08 1958-04-01 John C Clark Non-directional muffler
US3515242A (en) * 1969-09-05 1970-06-02 Alexander Tagg Ind Inc Exhaust silencer for internal combustion engines
US3648802A (en) * 1971-01-11 1972-03-14 Gen Motors Corp Gas flow baffle for wave interference silencing systems
US3888332A (en) * 1973-04-18 1975-06-10 Norton Villiers Ltd Exhaust silencers
US3888331A (en) * 1974-05-03 1975-06-10 Gen Motors Corp Power tuned wave interference silencer
US4050539A (en) * 1975-09-13 1977-09-27 Teruo Kashiwara Exhaust apparatus for internal combustion engine
US4222456A (en) * 1977-04-25 1980-09-16 Kasper Witold A Sound-suppressing and back pressure-reducing apparatus and method
US4167986A (en) * 1978-03-13 1979-09-18 Adco, Ltd. Fluid stream silencing device
US4206600A (en) * 1978-05-30 1980-06-10 Feuling James J Exhaust system for four-stroke internal combustion engines
US4339918A (en) * 1980-09-11 1982-07-20 Hirokuni Michikawa Means for accelerating the discharge of exhaust gas from an internal combustion engine
US4589515A (en) * 1984-02-08 1986-05-20 Nissan Motor Company, Limited Exhaust tail pipe arrangement
US4595073A (en) * 1984-05-14 1986-06-17 Nelson Industries Inc. Plug-type muffler section
US4841728A (en) * 1987-07-10 1989-06-27 Jyh-Jian Jean Straight through type muffler for generating the exhaust flow from an internal combustion engine
US4966253A (en) * 1989-08-23 1990-10-30 Howard Stephens Muffler device for exhaust systems
US5165231A (en) * 1990-07-16 1992-11-24 Rich Donald A Anti-reversion exhaust system
US5214253A (en) * 1990-10-26 1993-05-25 Houston Jr Richard G Automotive exhaust system
US5196653A (en) * 1991-05-20 1993-03-23 The United States Of America As Represented By The Secretary Of The Navy Muffler for air powered turbine drive
US5183976A (en) * 1991-11-26 1993-02-02 Plemons Jr R J Adjustable sound attenuating device
US5824970A (en) * 1994-07-20 1998-10-20 Gracia; Albert Louis Marine engine silencer having internal apertured baffle and weir plate
US5661272A (en) * 1995-01-27 1997-08-26 Iannetti; Francesco E. Engine noise reduction apparatus
US6065459A (en) * 1997-05-15 2000-05-23 Lynn Diane Johnston Correct-a-flow radius turnaround anti-reversionary venturi pipes
US6024189A (en) * 1997-08-20 2000-02-15 Heuser; Stephen G. Noise attenuating apparatus
US6588545B1 (en) * 1999-02-05 2003-07-08 Ok-no Lee Muffler for internal combustion engine
US20020053483A1 (en) * 1999-03-30 2002-05-09 Gunther Ebinger Double-walled tail pipe for an exhaust pipe of a motor vehicle exhaust system
US6415887B1 (en) * 1999-11-26 2002-07-09 Cr Patents, Inc. Refractive wave muffler
US6564901B2 (en) * 2000-03-09 2003-05-20 Woodrow E. Woods Muffler for marine engine
US6467572B1 (en) * 2000-08-15 2002-10-22 Jefferson Liu Muffler
US6510921B2 (en) * 2001-02-19 2003-01-28 Samson Motorcycle Products, Inc. Muffler/exhaust extractor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140041370A1 (en) * 2012-08-08 2014-02-13 GM Global Technology Operations LLC Exhaust Treatment System for Internal Combustion Engine
WO2017148666A1 (fr) 2016-02-29 2017-09-08 Robert Bosch Gmbh Dispositif d'induction de fluide destiné à un moteur de véhicule
US20190085800A1 (en) * 2016-03-30 2019-03-21 Bueng Nam YOO Fluid accelerator for internal combustion enginge

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