US2583366A - Muffler with perforated cylinder containing inwardly and rearwardly inclined holes - Google Patents

Muffler with perforated cylinder containing inwardly and rearwardly inclined holes Download PDF

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Publication number
US2583366A
US2583366A US707948A US2583366A US 2583366 A US2583366 A US 2583366A US 707948 A US707948 A US 707948A US 2583366 A US2583366 A US 2583366A
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cylinder
muffler
perforated cylinder
gas
rearwardly inclined
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Expired - Lifetime
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Willard H Engels
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Willard H Engels
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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
    • F01N1/00Silencing apparatus characterised by method of silencing
    • F01N1/24Silencing apparatus characterised by method of silencing by using sound-absorbing materials

Description

W. H. ENGELS MUFFLER WITH PERFORATED CYLINDER CONTAINING Jan. 22, 1952 INWARDLY AND REARWARDLY INCLINED HOLES Filed Feb. 9, 1948 Patented Jan. 22, 1952 MUFFLER WITH PERFORATED CYLINDER .CONTAINING INWARDLY AND REAR- WARDLY INCLINED HOLES Willard H. Engels, Kansas City, Mo.

Application February 9, 1948, Serial No. 7,079

1 Claim.

This invention relates to improvements in mufels for internal combustion engines, and has particular reference to means for muflling expanding and noise producing gases discharged from automobile engines.

The principal object of the present invention is to` provide a device structurally characterized by a novel arrangement of elements functionally related to muilie the noise of exhaust gases discharged from an engine while reducing back pressure upon the gases to a minimum to increase the elciency of the engine.

The explosion of the fuel within an internal combustion engine creates a high pressure therein. Upon the opening of the exhaust ports the gas emerges at high velocity. The result is a succession of pulsations or slugs of gas at high pressure traveling through the exhaust manifold at a high velocity. Upon the release of the gas slug into the atmosphere, another spurt in velocity is acquired due to expansion and a sharp sound results. In order to silence the pulsating exhaust noises the mufiler must suppress the pressure peaks and thus even the ow of the escaping gas pulsations to the point Where the sound generated is substantially uniform at all times.

The present invention presents a structure which smoothes out to a large degree the pulsating eifect of successive exhaust discharges from the engine, without setting up any material back pressure within the engine.

Other objects are simplicity and economy of construction, emciency of operation and adaptability for use with the various types of gas engines.

With these objects in view as well as other objects which will appear during the course of th specication, reference will be made to the drawings wherein:

Fig. 1 is an elevational view partly broken to disclose more fully the features of my invention.

Fig. 2 is a transverse sectional view taken on line II-II of Fig. 1.

Fig. 3 is an enlarged fragmental sectional view portion of the muiiler.

Throughout the several views of the drawings like reference numbers refer to similar parts and the numeral l designates a foraminous cylinder or tube made of a rigid material such as sheet metal provided with a substantially unobstructed central duct l2 through the full length ofthe muliler. The end portions I4 of cylinder l0 are plain and fit respectively into the engine exhaust pipe I6 and outlet exhaust pipe I8, through which the gases are discharged into the atmosphere.

Built about the foraminous portion of cylinder l0 is a housing 20 comprising a tubular wall 22 provided with end plates 24 and 26 whereby a chamber 28 is formed about the said cylinder. As shown wall 22 is concentric with cylinder l0, however, the shape and relationshipv of these parts might be varied if it is found convenient or beneficial. The chamber is provided adjacent the periphery of cylinder l0 with a plurality of convolutions of screen wire 30 which are slightly separated from the cylinder I0 by means hereinafter referred to. Positioned in chamber 28 outside screen wire 30 is packed with a porous, gas pressure absorbing and sound absorbing material, such as mineral fiber, steel, copper or other metallic wool 32 or any other gas pressure absorbing and sound absorbing material that is a non-inammable material, such as expanded vermiculite, porous aggregate, etc. In mounting housing 20 on cylinder I0, it is found convenient to weld the ilange 34 of said plate 24 to the cylinder I0, while the other end plate 26 is provided with an inwardly turned flange 36 and an outwardly turned flange 38, to present a sliding fit for the cylinder i 0. By means of this form of mounting, unequal expansion of parts will be compensated for to prevent separating of the joints.

Referring now specifically to Fig. 3 it will be noted that the foraminations or openings 40 are formed through cylinder i0 at an acute angle to the axis of the cylinder and in the general direction of the flow of gases therethrough, as indicated by the arrow. The flange or lip 42 at the forward edge of hole 40 is inclined inwardly in the general direction of flow of gases in cylinder I0. The ilange 44 at the rear edge of hole 40 is inclined outwardly against the direction of exhaust gas iiow through cylinder i0. As the highly pulsating gas discharges pass through cylinder I0 each pulsation or slug of gas in passing lip 42 will create a suction to pull gases from 28, then as the low pressure phase of the gas flow through cylinder I0 registers with said hole I0 gas will be drawn into chamber 28 thus tending to smooth out the gas flow. After this process has been repeated many times due to the presence of the many holes, as shown, the pulsating gas flow will be gradually smoothed out and the noise will be reduced to a uniform minimum, which will present a substantially constant uniform hum, which is not objectionable to the ear.

It will be noted that openings 40 in general pattern are arranged in spiral rows to spin the gases and thereby to further lend to the smoothing of the pulsating gas stream by suppressing the pressure peaks, and also to the silencing of the noise created by the escaping gas. The lips 44 extending outwardly from the cylinder l0 serve also as bearing points for screen 30 thus holding the screen in slightly spaced relation to the outer periphery of the cylinder I0.

From the foregoing description it is evident that I have produced a simple and comparativea ly inexpensive muler which effectively smoothes out the pulsating gases discharged from an internal combustion engine and mufes the attendant noises, and at the same time reducing the back pressure to a minimum.

What I claim is:

A muler comprising a perforated cylinder having a substantially uniform gas duct extending therethrough, a closed casing formed about saidv perforated cylinder to form a chamber thereabout, a layer of screen positioned in said chamber about said perforated cylinder, a sound absorbing material filling said chamber between said screen and said casing, said perforated cylinder being formed to present inwardly and rearwardly inclined lips at the forward edges of the perforations therein and outwardly and forward- 4 ly inclined lips at the rearward edges of said perforations, said outwardly inclined lips contacting and supporting said screen in spaced relation from said cylinder.

WILLARD H. ENGELS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,811,762 Schnell June 23, 1931 1,927,213 MacKenzie Sept. 19, 1933 2,065,343 MOOre Dec. 22, 1936 2,073,951 Servais Mar. 16, 1937 2,233,804 Bourne Mar. 4, 1941 2,241,150 Miller May 6, 1941 FOREIGN PATENTS Number Country Date 379,563 Great Britain Sept. 1, 1932 561,675 Germany Oct. 17, 1932 782,848 France June 12, 1935 461,065 Great Britain Feb. 9, 1937 469,155 Great Britain July 20, 1937 512,075 Great Britain Aug. 29, 1939

US2583366A 1948-02-09 1948-02-09 Muffler with perforated cylinder containing inwardly and rearwardly inclined holes Expired - Lifetime US2583366A (en)

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Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2674335A (en) * 1950-01-31 1954-04-06 C W Lemmerman Inc Muffler construction
US2720276A (en) * 1951-12-19 1955-10-11 Carl C Droeger Sound deadening means for jet engine test stands
US2732026A (en) * 1956-01-24 Muffler with flashing and spark
DE1031055B (en) * 1955-09-06 1958-05-29 Eberspaecher J Capacities with Schallschluckstoffuellung and Fuehrungskanal for pulsating Gasstroemung, especially Silencer for internal combustion engines
US2909235A (en) * 1955-11-03 1959-10-20 Gen Dynamics Corp Muffler
US2913870A (en) * 1955-01-19 1959-11-24 George E Lashley Exhaust system
US2918984A (en) * 1953-10-08 1959-12-29 Koppers Co Inc Sound control shroud for aircraft engines
US3075609A (en) * 1958-09-10 1963-01-29 Engelhard Ind Inc Noise suppressor
US3168935A (en) * 1962-06-18 1965-02-09 Upright Scaffold Ltd Mufflers or silencers
US3174583A (en) * 1960-11-30 1965-03-23 Giordano Michele Muffler for internal combustion engines
US3181646A (en) * 1963-04-15 1965-05-04 Howard C Edwards Silencer having contiguous concentric layers of sound absorbent material
US3191715A (en) * 1963-05-27 1965-06-29 Walker Mfg Co Muffler
US3204723A (en) * 1962-05-08 1965-09-07 Natalie Payne Exhaust muffler with filling of porous ceramic cinders and method of making same
US3233698A (en) * 1960-11-28 1966-02-08 Walker Mfg Co Muffler with one-piece outer housing
US3710891A (en) * 1971-08-25 1973-01-16 R Flugger Automotive muffler
US3765506A (en) * 1972-11-08 1973-10-16 Tenneco Inc Sound attenuating muffler
US3903928A (en) * 1972-08-15 1975-09-09 Smiths Industries Ltd Vehicle exhaust tubing
US3981378A (en) * 1974-10-16 1976-09-21 Horn Construction Co., Inc. Muffler for pile driving apparatus
US4036324A (en) * 1974-08-16 1977-07-19 Foseco International Limited Noise reduction
US4310068A (en) * 1979-02-28 1982-01-12 Imperial Chemical Industries Limited Acoustically lagged structure
US4356886A (en) * 1979-07-24 1982-11-02 Alcan Aluminiumwerke Gmbh External housing for an exhaust muffler for internal combustion engines
EP0074220A2 (en) * 1981-08-26 1983-03-16 Lancaster Glass Fibre Limited Improvements in or relating to inserts for silencers
US4479509A (en) * 1981-08-03 1984-10-30 E. I. Du Pont De Nemours And Company Fluid control apparatus
US4683978A (en) * 1984-11-22 1987-08-04 Tula Silencers (Propriety) Limited Exhaust silencer
FR2604747A1 (en) * 1986-10-07 1988-04-08 Cor Tubi Spa gas flow silencer
EP0389401A1 (en) * 1989-03-22 1990-09-26 Gracia José Maria Samarra Silencer for automobile exhaust systems
US5136923A (en) * 1982-07-30 1992-08-11 Walsh Donald J Jun Firearm silencer and flash attenuator
US5350888A (en) * 1992-05-01 1994-09-27 Tennessee Gas Pipeline Company Broad band low frequency passive muffler
US5365025A (en) * 1992-01-24 1994-11-15 Tennessee Gas Pipeline Company Low backpressure straight-through reactive and dissipative muffler
US5705777A (en) * 1995-10-20 1998-01-06 Carrier Corporation Refrigeration compressor muffler
US6155379A (en) * 1998-07-08 2000-12-05 Nsu Corporation Silencing member for mufflers and method of manufacturing the silencing member
US20030213643A1 (en) * 2002-04-05 2003-11-20 Martin Hirschorn Attenuating power booster
US20050023076A1 (en) * 2001-11-06 2005-02-03 Huff Norman T. Bumper/muffler assembly
US20050066954A1 (en) * 2003-09-12 2005-03-31 Williams Dan E. Paintball gun barrel with compression chamber
US20070240932A1 (en) * 2006-04-12 2007-10-18 Van De Flier Peter B Long fiber thermoplastic composite muffler system with integrated reflective chamber
US20070240934A1 (en) * 2006-04-12 2007-10-18 Van De Flier Peter Long fiber thermoplastic composite muffler system
US20080308347A1 (en) * 2007-06-15 2008-12-18 Don Emler Vehicular exhaust system
US20100307863A1 (en) * 2007-12-14 2010-12-09 Ocv Intellectual Capital, Llc Composite muffler system thermosetable polymers
US8256569B1 (en) * 2010-10-04 2012-09-04 Huff Dennis L Exhaust sound attenuation device and method of use

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1811762A (en) * 1929-05-08 1931-06-23 Burgess Lab Inc C F Exhaust muffler
GB379563A (en) * 1931-11-16 1932-09-01 Wallace Cranston Fairweather Improvements in silencers for internal combustion engines
DE561675C (en) * 1929-04-27 1932-10-17 Paul Wunderwald Silencer for internal combustion engines
US1927213A (en) * 1930-08-15 1933-09-19 Buffalo Pressed Steel Company Silencer
FR782848A (en) * 1934-03-03 1935-06-12 Bronzavia Sa Silencer for internal combustion engines and other applications
US2065343A (en) * 1930-11-13 1936-12-22 M & M Engineering Corp Exhaust muffler
GB461065A (en) * 1935-07-22 1937-02-09 Maschf Augsburg Nuernberg Ag Improvements in or relating to silencers for silencing gaseous currents
US2073951A (en) * 1935-12-09 1937-03-16 Servais Services Ltd Silencer for gaseous currents
GB469155A (en) * 1935-06-04 1937-07-20 Eberspaecher G M B H J Improvements in sheets, walls and the like having nozzle openings therein
GB512075A (en) * 1938-04-02 1939-08-29 Wilhelm Petersen Wold Silencer for internal-combustion engines
US2233804A (en) * 1938-07-18 1941-03-04 Maxim Silencer Co Fluid silencer
US2241150A (en) * 1940-01-27 1941-05-06 Reese F Morgan Exhaust muffler

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE561675C (en) * 1929-04-27 1932-10-17 Paul Wunderwald Silencer for internal combustion engines
US1811762A (en) * 1929-05-08 1931-06-23 Burgess Lab Inc C F Exhaust muffler
US1927213A (en) * 1930-08-15 1933-09-19 Buffalo Pressed Steel Company Silencer
US2065343A (en) * 1930-11-13 1936-12-22 M & M Engineering Corp Exhaust muffler
GB379563A (en) * 1931-11-16 1932-09-01 Wallace Cranston Fairweather Improvements in silencers for internal combustion engines
FR782848A (en) * 1934-03-03 1935-06-12 Bronzavia Sa Silencer for internal combustion engines and other applications
GB469155A (en) * 1935-06-04 1937-07-20 Eberspaecher G M B H J Improvements in sheets, walls and the like having nozzle openings therein
GB461065A (en) * 1935-07-22 1937-02-09 Maschf Augsburg Nuernberg Ag Improvements in or relating to silencers for silencing gaseous currents
US2073951A (en) * 1935-12-09 1937-03-16 Servais Services Ltd Silencer for gaseous currents
GB512075A (en) * 1938-04-02 1939-08-29 Wilhelm Petersen Wold Silencer for internal-combustion engines
US2233804A (en) * 1938-07-18 1941-03-04 Maxim Silencer Co Fluid silencer
US2241150A (en) * 1940-01-27 1941-05-06 Reese F Morgan Exhaust muffler

Cited By (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732026A (en) * 1956-01-24 Muffler with flashing and spark
US2674335A (en) * 1950-01-31 1954-04-06 C W Lemmerman Inc Muffler construction
US2720276A (en) * 1951-12-19 1955-10-11 Carl C Droeger Sound deadening means for jet engine test stands
US2918984A (en) * 1953-10-08 1959-12-29 Koppers Co Inc Sound control shroud for aircraft engines
US2913870A (en) * 1955-01-19 1959-11-24 George E Lashley Exhaust system
DE1031055B (en) * 1955-09-06 1958-05-29 Eberspaecher J Capacities with Schallschluckstoffuellung and Fuehrungskanal for pulsating Gasstroemung, especially Silencer for internal combustion engines
US2909235A (en) * 1955-11-03 1959-10-20 Gen Dynamics Corp Muffler
US3075609A (en) * 1958-09-10 1963-01-29 Engelhard Ind Inc Noise suppressor
US3233698A (en) * 1960-11-28 1966-02-08 Walker Mfg Co Muffler with one-piece outer housing
US3174583A (en) * 1960-11-30 1965-03-23 Giordano Michele Muffler for internal combustion engines
US3204723A (en) * 1962-05-08 1965-09-07 Natalie Payne Exhaust muffler with filling of porous ceramic cinders and method of making same
US3168935A (en) * 1962-06-18 1965-02-09 Upright Scaffold Ltd Mufflers or silencers
US3181646A (en) * 1963-04-15 1965-05-04 Howard C Edwards Silencer having contiguous concentric layers of sound absorbent material
US3191715A (en) * 1963-05-27 1965-06-29 Walker Mfg Co Muffler
US3710891A (en) * 1971-08-25 1973-01-16 R Flugger Automotive muffler
US3903928A (en) * 1972-08-15 1975-09-09 Smiths Industries Ltd Vehicle exhaust tubing
US3765506A (en) * 1972-11-08 1973-10-16 Tenneco Inc Sound attenuating muffler
US4036324A (en) * 1974-08-16 1977-07-19 Foseco International Limited Noise reduction
US3981378A (en) * 1974-10-16 1976-09-21 Horn Construction Co., Inc. Muffler for pile driving apparatus
US4310068A (en) * 1979-02-28 1982-01-12 Imperial Chemical Industries Limited Acoustically lagged structure
US4356886A (en) * 1979-07-24 1982-11-02 Alcan Aluminiumwerke Gmbh External housing for an exhaust muffler for internal combustion engines
US4479509A (en) * 1981-08-03 1984-10-30 E. I. Du Pont De Nemours And Company Fluid control apparatus
EP0074220A3 (en) * 1981-08-26 1984-05-16 Lancaster Glass Fibre Limited Improvements in or relating to inserts for silencers
EP0074220A2 (en) * 1981-08-26 1983-03-16 Lancaster Glass Fibre Limited Improvements in or relating to inserts for silencers
US5136923A (en) * 1982-07-30 1992-08-11 Walsh Donald J Jun Firearm silencer and flash attenuator
US4683978A (en) * 1984-11-22 1987-08-04 Tula Silencers (Propriety) Limited Exhaust silencer
FR2604747A1 (en) * 1986-10-07 1988-04-08 Cor Tubi Spa gas flow silencer
EP0389401A1 (en) * 1989-03-22 1990-09-26 Gracia José Maria Samarra Silencer for automobile exhaust systems
US5365025A (en) * 1992-01-24 1994-11-15 Tennessee Gas Pipeline Company Low backpressure straight-through reactive and dissipative muffler
US5350888A (en) * 1992-05-01 1994-09-27 Tennessee Gas Pipeline Company Broad band low frequency passive muffler
US5705777A (en) * 1995-10-20 1998-01-06 Carrier Corporation Refrigeration compressor muffler
US5784784A (en) * 1995-10-20 1998-07-28 Carrier Corporation Method of making a refrigeration compressor muffler
US6155379A (en) * 1998-07-08 2000-12-05 Nsu Corporation Silencing member for mufflers and method of manufacturing the silencing member
US7325652B2 (en) * 2001-11-06 2008-02-05 Ocv Intellectual Capital, Llc Bumper/muffler assembly
US20050023076A1 (en) * 2001-11-06 2005-02-03 Huff Norman T. Bumper/muffler assembly
US20030213643A1 (en) * 2002-04-05 2003-11-20 Martin Hirschorn Attenuating power booster
US7364011B2 (en) * 2002-04-05 2008-04-29 Martin Hirschorn Attenuating power booster
US20050066954A1 (en) * 2003-09-12 2005-03-31 Williams Dan E. Paintball gun barrel with compression chamber
US20070240932A1 (en) * 2006-04-12 2007-10-18 Van De Flier Peter B Long fiber thermoplastic composite muffler system with integrated reflective chamber
US20070240934A1 (en) * 2006-04-12 2007-10-18 Van De Flier Peter Long fiber thermoplastic composite muffler system
US7934580B2 (en) 2006-04-12 2011-05-03 Ocv Intellectual Capital, Llc Long fiber thermoplastic composite muffler system
US7942237B2 (en) 2006-04-12 2011-05-17 Ocv Intellectual Capital, Llc Long fiber thermoplastic composite muffler system with integrated reflective chamber
US7552797B2 (en) * 2007-06-15 2009-06-30 Don Emler Vehicular exhaust system
US20080308347A1 (en) * 2007-06-15 2008-12-18 Don Emler Vehicular exhaust system
US20100307863A1 (en) * 2007-12-14 2010-12-09 Ocv Intellectual Capital, Llc Composite muffler system thermosetable polymers
US8256569B1 (en) * 2010-10-04 2012-09-04 Huff Dennis L Exhaust sound attenuation device and method of use

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