US3209861A - Muffler with two longitudinally separated chambers - Google Patents
Muffler with two longitudinally separated chambers Download PDFInfo
- Publication number
- US3209861A US3209861A US319456A US31945663A US3209861A US 3209861 A US3209861 A US 3209861A US 319456 A US319456 A US 319456A US 31945663 A US31945663 A US 31945663A US 3209861 A US3209861 A US 3209861A
- Authority
- US
- United States
- Prior art keywords
- chambers
- outer shell
- inner tube
- length
- muffler
- 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.)
- Expired - Lifetime
Links
- 230000002745 absorbent Effects 0.000 claims description 4
- 239000002250 absorbent Substances 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 239000011521 glass Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000030279 gene silencing Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000001743 silencing effect Effects 0.000 description 1
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
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/003—Silencing apparatus characterised by method of silencing by using dead chambers communicating with gas flow passages
-
- 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
- F01N1/24—Silencing apparatus characterised by method of silencing by using sound-absorbing materials
Definitions
- the invention accomplishes this by means of a simple, two-part construction comprising an outer shell and an inner gas flow tube.
- the shell is pinched down at an intermediate point to contact the tube and divide the space between theshell and the tube in the two longitudinally separated chambers.
- One of these may be filled with glass fibers or suitable sound absorbent material.
- FIGURE 1 is a longitudinal cross section through the muffler of this invention.
- FIG. 2 is a cross section along the line 2-2 of FIG. 1.
- the mufller 1 has an outer shell 3 which is preferably formed from a tubular piece of metal which is swaged down to form an inlet end 5 and an outlet end 7 which are provided respectively with an inlet bushing 9 and an outlet bushing 11 for attachment to an exhaust pipe and a tailpipe in an automotive exhaust system.
- a louvered gas flow tube 13 which is seated at opposite ends in the bushings 9 and 11 of the shell 3 and preferably spotwelded at x to one of them.
- the tube 13 may be provided with a restriction 15 which can be formed by rolling a reduced diameter section in the tube.
- the tube 13 is also provided with banks of louvers 17 which open into the space between the tube 13 and the shell 3.
- the shell 3 is pinched down into contact with the tube 13 by pinching together folds of metal 19 so as to reduce the intermediate portions 21 into wrap around contact with the outside diameter of the tube 13.
- One of the chambers, preferably the downstream chamber 23, is filled with sound absorbent material such as glass pack.
- gas will enter the inet bushing 9 and flow lengthwise through the tube 13 to flow out of the unit through the outlet bushing 11.
- the restriction 15 imposes a controlled amount of back pressure on the gas and therefore facilitates an improves the silencing effect of the muffler 1.
- the gases passing through the tube 13 communicate with the space 23 where many of the intermediate and high frequency sounds are attenuated.
- the glass pack section 25 substantial amount of additional attenuation occurs in the glass pack section 25.
- the intermediate and high frequencies are removed also by the glass pack 25 so that the unit as a whole has a substantially high eificiency in removing intermediate and high frequencies without utilizing a very large amount of glass pack material.
- the presence of the restriction 15 upstream of the glass pack tends to protect the glass pack againt loss by erosion, as
- the low frequencies are not effectively removed by this device so that it constitutes the Hollywood or sport-type mufiler which leaves the low power note in the exhaust system.
- a Hollywood type exhaust muffler for internal combustion engines comprising an outer shell of substantially uniform cross-sectional area throughout the major portion of its length with an intermediate section of reduced cross-section, an inner tube extending through said outer shell and engaged substantially around its periphery by said intermediate section to divide the space between said inner tube and said outer shell into two longitudinally separated chambers, said inner tube providing a straight through flow path throughout the length of said outer shell of substantially constant cross-sectional area through the major portion of its length, said inner tube having a plurality of openings into each of said chambers, one of said chambers being empty, and a sound absorbent substance filling the other of said chambers.
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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)
Description
Oct. 5, 1965 w. c. WHITNEY v 3,209,861
MUFFLER WITH TWO mucmunmnw, sannnsn cmuasns Filed Oct. 28, 1963 INVENTOR.
United States Patent 3,209,861 MUFFLER WITH TWO LONGITUDINALLY SEPARATED CHAMBERS William (1. Whitney, Jackson, Mich, assiguor to Walker Manufacturing Company, a corporation of Delaware Filed Oct. 28, 1963, Ser. No. 319,456 2 Claims. (Cl. 181-59) My invention relates to automotive exhaust mufflers.
It is an object of my invention to provide an improved sport or Hollywood-type exhaust mufller. The invention accomplishes this by means of a simple, two-part construction comprising an outer shell and an inner gas flow tube. The shell is pinched down at an intermediate point to contact the tube and divide the space between theshell and the tube in the two longitudinally separated chambers. One of these may be filled with glass fibers or suitable sound absorbent material.
The invention is illustrated in the accompanying drawings in which:
FIGURE 1 is a longitudinal cross section through the muffler of this invention; and
FIG. 2 is a cross section along the line 2-2 of FIG. 1.
The mufller 1 has an outer shell 3 which is preferably formed from a tubular piece of metal which is swaged down to form an inlet end 5 and an outlet end 7 which are provided respectively with an inlet bushing 9 and an outlet bushing 11 for attachment to an exhaust pipe and a tailpipe in an automotive exhaust system. Inside of the shell 3 is a louvered gas flow tube 13 which is seated at opposite ends in the bushings 9 and 11 of the shell 3 and preferably spotwelded at x to one of them. The tube 13 may be provided with a restriction 15 which can be formed by rolling a reduced diameter section in the tube. The tube 13 is also provided with banks of louvers 17 which open into the space between the tube 13 and the shell 3.
The shell 3 is pinched down into contact with the tube 13 by pinching together folds of metal 19 so as to reduce the intermediate portions 21 into wrap around contact with the outside diameter of the tube 13. This divides the inside of the casing 3 into a chamber 23 upstream of the folds 19 and the chamber 25 downstream of the folds 19. One of the chambers, preferably the downstream chamber 23, is filled with sound absorbent material such as glass pack.
In operation, gas will enter the inet bushing 9 and flow lengthwise through the tube 13 to flow out of the unit through the outlet bushing 11. The restriction 15 imposes a controlled amount of back pressure on the gas and therefore facilitates an improves the silencing effect of the muffler 1. The gases passing through the tube 13 communicate with the space 23 where many of the intermediate and high frequency sounds are attenuated. A
substantial amount of additional attenuation occurs in the glass pack section 25. The intermediate and high frequencies are removed also by the glass pack 25 so that the unit as a whole has a substantially high eificiency in removing intermediate and high frequencies without utilizing a very large amount of glass pack material. The presence of the restriction 15 upstream of the glass pack tends to protect the glass pack againt loss by erosion, as
well as improve the silencing characteristics of the unit. The low frequencies are not effectively removed by this device so that it constitutes the Hollywood or sport-type mufiler which leaves the low power note in the exhaust system.
Modifications may be made without departing from the spirit and scope of the invention.
I claim:
1. A Hollywood type exhaust muffler for internal combustion engines comprising an outer shell of substantially uniform cross-sectional area throughout the major portion of its length with an intermediate section of reduced cross-section, an inner tube extending through said outer shell and engaged substantially around its periphery by said intermediate section to divide the space between said inner tube and said outer shell into two longitudinally separated chambers, said inner tube providing a straight through flow path throughout the length of said outer shell of substantially constant cross-sectional area through the major portion of its length, said inner tube having a plurality of openings into each of said chambers, one of said chambers being empty, and a sound absorbent substance filling the other of said chambers.
2. A Hollywood type exhaust mufiier as set forth in claim 1 wherein the inner tube is formed With an integral flow restriction of reduced cross-sectional area in one of said chambers.
References Cited by the Examiner UNITED STATES PATENTS 2,047,442 7/36 Starkweather et al 181-48 2,047,443 7/ 36 Starkweather, et al 181-35 2,056,608 10/36 Jack 181-42 X 2,194,457 3/40 Cary 181-35 2,251,880 8/41 Cary et al 181-48 2,367,753 1/45 Buck.
FOREIGN PATENTS 881,494 1/43 France.
988,370 4/51 France. 1,158,817 3/58 France. 1,063,136 12/53 France. 1,074,071 3/54 France.
892,780 3/ 62 Great Britain.
LEO SMILOW, Primary Examiner.
Claims (1)
1. A HOLLYWOOD TYPE EXHAUST MUFFLER FOR INTERNAL COMBUSTION ENGINES COMPRISING AN OUTER SHELL OF SUBSTANTIALLY UNIFORM CROSS-SECTIONAL AREA THROUGHOUT THE MAJOR PORTION OF ITS LENGTH WITH AN INTERMEDIATE SECTION OF REDUCED CROSS-SECTION, AN INNER TUBE EXTENDING THROUGH SAID OUTER SHELL AND ENGAGED SUBSTANTIALLY AROUND ITS PERIPHERY BY SAID INTERMEDIATE SECTION TO DIVIDE THE SPACE BETWEEN SAID INNER TUBE AND SAID OUTER SHELL INTO TWO LONGITUDINALLY SEPARATED CHAMBERS, SAID INNER TUBE PROVIDING A STRAIGHT THROUGH FLOW PATH THROUGHOUT THE LENGTH OF SAID OUTER SHELL OF SUBSTANTIALLY CONSTANT CROSS-SECTIONAL AREA THROUGH THE MAJOR PORTION OF ITS LENGTH, SAID INNER TUBE HAVING A PLURALITY OF OPENINGS INTO EACH OF SAID CHAMBERS, ONE OF SAID CHAMBERS BEING EMPTY, AND A SOUND ABSORBENT SUBSTANCE FILLING THE OTHER OF SAID CHAMBERS.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US319456A US3209861A (en) | 1963-10-28 | 1963-10-28 | Muffler with two longitudinally separated chambers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US319456A US3209861A (en) | 1963-10-28 | 1963-10-28 | Muffler with two longitudinally separated chambers |
Publications (1)
Publication Number | Publication Date |
---|---|
US3209861A true US3209861A (en) | 1965-10-05 |
Family
ID=23242307
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US319456A Expired - Lifetime US3209861A (en) | 1963-10-28 | 1963-10-28 | Muffler with two longitudinally separated chambers |
Country Status (1)
Country | Link |
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US (1) | US3209861A (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3263772A (en) * | 1964-06-17 | 1966-08-02 | Arvin Ind Inc | Sound attenuating gas conduit with one-quarter wave-length side branch chambers |
US3313373A (en) * | 1965-01-11 | 1967-04-11 | Midas Internat Corp | Muffler with baffles formed as chordal flanges |
US3323613A (en) * | 1964-10-26 | 1967-06-06 | Walker Mfg Co | Three-part muffler with side branch chambers |
US3415336A (en) * | 1966-11-14 | 1968-12-10 | Arvin Ind Inc | Resonator and method of making it |
US3500954A (en) * | 1969-03-13 | 1970-03-17 | Walker Mfg Co | Exhaust silencing system |
US3752260A (en) * | 1971-07-15 | 1973-08-14 | Tenneco Inc | Air rush silencer |
US3841435A (en) * | 1973-02-05 | 1974-10-15 | Tenneco Inc | Swaged tri-flow muffler |
US4023645A (en) * | 1975-02-27 | 1977-05-17 | Donaldson Company, Inc. | Method and apparatus for reducing aerodynamic whistle |
US4109753A (en) * | 1976-11-19 | 1978-08-29 | Midas-International Corporation | Muffler assembly |
US6082487A (en) * | 1998-02-13 | 2000-07-04 | Donaldson Company, Inc. | Mufflers for use with engine retarders; and methods |
US6354398B1 (en) | 1998-02-13 | 2002-03-12 | Donaldson Company, Inc. | Mufflers for use with engine retarders; and methods |
US20070158136A1 (en) * | 2006-01-06 | 2007-07-12 | Yamaha Hatsudoki Kabushiki Kaisha | Muffler and Vehicle Equipped with Muffler |
DE102017126125A1 (en) | 2017-11-08 | 2019-05-09 | Dietrich Denker | Device for lowering airborne and structure-borne noise |
Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2047442A (en) * | 1935-08-15 | 1936-07-14 | Buffalo Pressed Steel Company | Muffler |
US2047443A (en) * | 1936-03-09 | 1936-07-14 | Buffalo Pressed Steel Company | Muffler |
US2056608A (en) * | 1933-12-22 | 1936-10-06 | C F Burges Lab Inc | Silencer |
US2194457A (en) * | 1938-07-27 | 1940-03-26 | Hayes Ind Inc | Muffler construction |
US2251880A (en) * | 1936-04-24 | 1941-08-05 | Hayes Ind Inc | Muffler and silencer construction |
FR881494A (en) * | 1939-12-22 | 1943-04-27 | Fahrradwerke Bismarck Ag | Quiet |
US2367753A (en) * | 1940-04-29 | 1945-01-23 | Hayes Ind Inc | Method of making mufflers and the like |
FR988370A (en) * | 1949-04-08 | 1951-08-27 | Exhaust | |
FR1063136A (en) * | 1952-06-04 | 1954-04-29 | Device for expanding the exhaust gases and damping the sound waves of these gases, in particular for motor vehicles and similar applications | |
FR1074071A (en) * | 1953-02-02 | 1954-10-01 | Improvements to silencers for engine exhaust | |
FR1158817A (en) * | 1955-09-06 | 1958-06-19 | Eberspaecher J | Protective device for maintaining the acoustic resistance of absorbent substances and the acoustic tuning of vessels subjected to oscillatory stresses, filled with absorbent substances for pulsating flow |
GB892780A (en) * | 1959-12-11 | 1962-03-28 | Morris Motors Ltd | Improvements in or relating to exhaust-silencers |
-
1963
- 1963-10-28 US US319456A patent/US3209861A/en not_active Expired - Lifetime
Patent Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2056608A (en) * | 1933-12-22 | 1936-10-06 | C F Burges Lab Inc | Silencer |
US2047442A (en) * | 1935-08-15 | 1936-07-14 | Buffalo Pressed Steel Company | Muffler |
US2047443A (en) * | 1936-03-09 | 1936-07-14 | Buffalo Pressed Steel Company | Muffler |
US2251880A (en) * | 1936-04-24 | 1941-08-05 | Hayes Ind Inc | Muffler and silencer construction |
US2194457A (en) * | 1938-07-27 | 1940-03-26 | Hayes Ind Inc | Muffler construction |
FR881494A (en) * | 1939-12-22 | 1943-04-27 | Fahrradwerke Bismarck Ag | Quiet |
US2367753A (en) * | 1940-04-29 | 1945-01-23 | Hayes Ind Inc | Method of making mufflers and the like |
FR988370A (en) * | 1949-04-08 | 1951-08-27 | Exhaust | |
FR1063136A (en) * | 1952-06-04 | 1954-04-29 | Device for expanding the exhaust gases and damping the sound waves of these gases, in particular for motor vehicles and similar applications | |
FR1074071A (en) * | 1953-02-02 | 1954-10-01 | Improvements to silencers for engine exhaust | |
FR1158817A (en) * | 1955-09-06 | 1958-06-19 | Eberspaecher J | Protective device for maintaining the acoustic resistance of absorbent substances and the acoustic tuning of vessels subjected to oscillatory stresses, filled with absorbent substances for pulsating flow |
GB892780A (en) * | 1959-12-11 | 1962-03-28 | Morris Motors Ltd | Improvements in or relating to exhaust-silencers |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3263772A (en) * | 1964-06-17 | 1966-08-02 | Arvin Ind Inc | Sound attenuating gas conduit with one-quarter wave-length side branch chambers |
US3323613A (en) * | 1964-10-26 | 1967-06-06 | Walker Mfg Co | Three-part muffler with side branch chambers |
US3313373A (en) * | 1965-01-11 | 1967-04-11 | Midas Internat Corp | Muffler with baffles formed as chordal flanges |
US3415336A (en) * | 1966-11-14 | 1968-12-10 | Arvin Ind Inc | Resonator and method of making it |
US3500954A (en) * | 1969-03-13 | 1970-03-17 | Walker Mfg Co | Exhaust silencing system |
US3752260A (en) * | 1971-07-15 | 1973-08-14 | Tenneco Inc | Air rush silencer |
US3841435A (en) * | 1973-02-05 | 1974-10-15 | Tenneco Inc | Swaged tri-flow muffler |
US4023645A (en) * | 1975-02-27 | 1977-05-17 | Donaldson Company, Inc. | Method and apparatus for reducing aerodynamic whistle |
US4109753A (en) * | 1976-11-19 | 1978-08-29 | Midas-International Corporation | Muffler assembly |
US6082487A (en) * | 1998-02-13 | 2000-07-04 | Donaldson Company, Inc. | Mufflers for use with engine retarders; and methods |
US6354398B1 (en) | 1998-02-13 | 2002-03-12 | Donaldson Company, Inc. | Mufflers for use with engine retarders; and methods |
US20070158136A1 (en) * | 2006-01-06 | 2007-07-12 | Yamaha Hatsudoki Kabushiki Kaisha | Muffler and Vehicle Equipped with Muffler |
US7866442B2 (en) * | 2006-01-06 | 2011-01-11 | Yamaha Hatsudoki Kabushiki Kaisha | Muffler and vehicle equipped with muffler |
DE102017126125A1 (en) | 2017-11-08 | 2019-05-09 | Dietrich Denker | Device for lowering airborne and structure-borne noise |
WO2019092038A1 (en) | 2017-11-08 | 2019-05-16 | Umfotec Gmbh | Device for reducing airborne and structure-borne sound |
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