US2586788A - Air-cooled exhaust muffler with frusto-conical body - Google Patents

Air-cooled exhaust muffler with frusto-conical body Download PDF

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Publication number
US2586788A
US2586788A US4221A US422148A US2586788A US 2586788 A US2586788 A US 2586788A US 4221 A US4221 A US 4221A US 422148 A US422148 A US 422148A US 2586788 A US2586788 A US 2586788A
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muffler
air
frusto
conical body
cooled exhaust
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US4221A
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Walton W Cushman
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    • 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
    • F01N13/082—Other arrangements or adaptations of exhaust conduits of tailpipe, e.g. with means for mixing air with exhaust for exhaust cooling, dilution or evacuation

Definitions

  • the present invention relates to mufflers for the exhaust of internal combustion engines and has for its primary object to provide a muffler so designed as to eliminate the possibility of sparks or flames being emitted therefrom.
  • Another object of the invention resides in the provision of a spark and flame arresting muffler which is of relatively simple and inexpensive construction and yet which is highly effective in deadening the sounds emanating from the engine cylinders and in disposing of any sparks and flames prior to their reaching the rear end of the muffler.
  • Figure 2 is a transverse sectional view taken on the line 2-2 of Figure 1, and
  • Figure 3 is a similar view taken on line 3-3 of Figure 1.
  • the invention comprises a hollow elongated body flared outwardly and rearwardly to permit an expansion of the exhaust gases as they leave the exhaust pipe and travel along the length of the muffler, in combination with means for rapidly diluting the exhaust gases with air to not only break down the sound waves but also to cool the gases to a temperature at which combustion will not take place and to a mixture ratio Well outside the range of combustibility, i. e., somewhat above twenty (20) parts of air to one (1) part of gasoline.
  • the numeral I indicates the body of the muffler which is formed of any preferred metal and is of frusto-conical shape; the smaller end being secured to the rear end of an exhaust pipe 2.
  • the mounting for the muffler comprises a ring 3 secured to the smaller end of the muffler by a plurality of webs 4 so that the ring is concentrically arranged with respect to the mufller and is spaced inwardly of its walls.
  • the muffler may be secured directly to the exhaust pipe 2, but
  • a short tubular member '5 be connected to the inner wall of the ring 3, by welding or otherwise, and that the tubular member be clamped to the exhaust pipe by means of a clamping ring 6 and bolt 1.
  • the tubular member 5 is of course provided with one or more slits -8 to permit it to be contracted by the clamping ring 6 so as to firmly grip the exterior of the exhaust pipe.
  • the inner end of the tube that is, the end extending into the interior of the muffler is tapered as indicated by the numeral 8 for the purpose of speeding the flow of exhaust gases so as to increase the suction effect within the muffler as more fully set forth hereinafter.
  • the smaller end of the muffler body I is flared outwardly as indicated by the numeral 9 for the purpose of trapping a larger quantity of atmospheric air and directing it into the muffler, and the body of the muffler itself is provided with a plurality of annular series of struck-up cupshaped tongues l0 associated with apertures H.
  • the tongues H] are directed toward the smaller end of the mufller body and thus supplement the action of the flared portion 9 of the muffler in directing air into the interior of the muiller. It will be understood of course that while these tongues and apertures If] and H are shown as uniformly arranged in annular series they may be arranged in any preferred manner so long as they cover a major portion of the wall of the muiller and extend throughout its length.
  • the current of exhaust gases passing through the tube 5 and narrowed end 8 provide a suction or aspirating effect so as to draw air in through the flared end 9 of the mufiler body to supplement the action of the forward movement of the vehicle and the muffler which is attached thereto.
  • This high volume of air entering the muffler tends to dilute the gases and break up the sound waves and this action is supplemented by the many currents of air entering the muffler throughout its length by reason of the inclined tongues l0 and the apertures H associated therewith.
  • the flared construction of the muffler contributes to this same result by allowing the further expansion of the gases as they travel rearwardly.
  • a muffler comprising an interiorly unobstructed, hollow, open-ended frusto-conical body provided with an outwardly-flared portion on its sma11er end, means for securing the smaller end of the body to the end of the exhaust pipe of an engine in axial alignment therewith and with the wall of the smaller end spaced radically outward of the wall of the exhaust pipe, the wall of said body provided with a plurality of apertures, and means for directing air inwardly through said apertures.
  • a muffler comprising an interiorly unobstructed, hollow, open-ended frusto-conical body having its exterior wall exposed to the atmosphere and provided with an outwardly-flared portion on its smaller end, means for securing the smalled end of the body to the end of the exhaust 20 pipe of an engine in axial alignment therewith and with the wall of the smaller end spaced radically outward of the wall of the exhaust pipe, and a plurality of tongues struck-up from said body and extending toward the smaller end thereof.
  • a muffler comprising an interiorly unobstructed, hollow, open-ended frusto-conical body having its exterior wall exposed to the atmosphere and provided with an outwardly-flared portion on its smaller end, the wall of said body provided with a plurality of apertures, means for directing air through said apertures, and an openended tube of relatively small diameter secured in the smaller end of the frusto-conical body and having its inner end tapered.
  • a muffler comprising an open-ended, hollow, frusto-conical body having its exterior wall exposed to the atmosphere and provided with an outwardly-flared portion at its smaller end, means for securing the smaller end of the body to the exhaust pipe of an engine in axial alignment with the exhaust pipe, the wall of the body being radially spaced from the exhaust pipe, said mufller body being provided with a plurality of apertures, and means for directing air through said apertures comprising cup-shaped tongues struckup from the body and extendin toward the smaller end thereof.

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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

Feb, 26, 1952 w. w. CUSHMIAN 2,586,788
AIR-COOLED EXHAUST MUFFLER WITH FRUSTO-CONICAL BODY Filed Jan. 26, 1948 INVENTOR.
477073/VEY Patented Feb. 26, 1952 UNITED STATES PATENT OFFICE AIR-COOLED EXHAUST MUFFLER WITH FRUSTO-CONICAL BODY (Granted under the act of March 3, 1883, as amended April 30, 1928; 3'70 0. G. 757) 4 Claims.
The invention described herein, if patented, may be manufactured and used by or for the Government for governmental purposes Without the payment to me of any royalty thereon.
The present invention relates to mufflers for the exhaust of internal combustion engines and has for its primary object to provide a muffler so designed as to eliminate the possibility of sparks or flames being emitted therefrom.
Another object of the invention resides in the provision of a spark and flame arresting muffler which is of relatively simple and inexpensive construction and yet which is highly effective in deadening the sounds emanating from the engine cylinders and in disposing of any sparks and flames prior to their reaching the rear end of the muffler.
Other objects and advantages of the invention will be apparent from the following description when taken in connection with the accompanying drawings, in which Figure 1 is a side elevational view of the muffler, with parts broken away,
Figure 2 is a transverse sectional view taken on the line 2-2 of Figure 1, and
Figure 3 is a similar view taken on line 3-3 of Figure 1.
Basically, the invention comprises a hollow elongated body flared outwardly and rearwardly to permit an expansion of the exhaust gases as they leave the exhaust pipe and travel along the length of the muffler, in combination with means for rapidly diluting the exhaust gases with air to not only break down the sound waves but also to cool the gases to a temperature at which combustion will not take place and to a mixture ratio Well outside the range of combustibility, i. e., somewhat above twenty (20) parts of air to one (1) part of gasoline.
In the present illustration of the invention the numeral I indicates the body of the muffler which is formed of any preferred metal and is of frusto-conical shape; the smaller end being secured to the rear end of an exhaust pipe 2.
The mounting for the muffler comprises a ring 3 secured to the smaller end of the muffler by a plurality of webs 4 so that the ring is concentrically arranged with respect to the mufller and is spaced inwardly of its walls. The muffler may be secured directly to the exhaust pipe 2, but
it is preferred that a short tubular member '5 be connected to the inner wall of the ring 3, by welding or otherwise, and that the tubular member be clamped to the exhaust pipe by means of a clamping ring 6 and bolt 1. The tubular member 5 is of course provided with one or more slits -8 to permit it to be contracted by the clamping ring 6 so as to firmly grip the exterior of the exhaust pipe. The inner end of the tube that is, the end extending into the interior of the muffler is tapered as indicated by the numeral 8 for the purpose of speeding the flow of exhaust gases so as to increase the suction effect within the muffler as more fully set forth hereinafter.
The smaller end of the muffler body I is flared outwardly as indicated by the numeral 9 for the purpose of trapping a larger quantity of atmospheric air and directing it into the muffler, and the body of the muffler itself is provided with a plurality of annular series of struck-up cupshaped tongues l0 associated with apertures H. The tongues H] are directed toward the smaller end of the mufller body and thus supplement the action of the flared portion 9 of the muffler in directing air into the interior of the muiller. It will be understood of course that while these tongues and apertures If] and H are shown as uniformly arranged in annular series they may be arranged in any preferred manner so long as they cover a major portion of the wall of the muiller and extend throughout its length.
In the operation of the muffler the current of exhaust gases passing through the tube 5 and narrowed end 8 provide a suction or aspirating effect so as to draw air in through the flared end 9 of the mufiler body to supplement the action of the forward movement of the vehicle and the muffler which is attached thereto. This high volume of air entering the muffler tends to dilute the gases and break up the sound waves and this action is supplemented by the many currents of air entering the muffler throughout its length by reason of the inclined tongues l0 and the apertures H associated therewith. Moreover, the flared construction of the muffler contributes to this same result by allowing the further expansion of the gases as they travel rearwardly. By reason of these several cooperating actions upon the exhaust gases the sound caused by the explosions in the cylinders are materially reduced and the possibility of sparks or flames passing outwardly from the rear end of the muffler is eliminated due to the fact that the large amount of air entering the muffler will dilute and cool the gases beyond the point at which combustion will be supported.
While the muffler has been described in some detail the invention is not so limited in scope, and it is therefore intended that the present disclosure be considered as illustrative of the invention rather than in a limiting sense.
I claim:
1. A muffler comprising an interiorly unobstructed, hollow, open-ended frusto-conical body provided with an outwardly-flared portion on its sma11er end, means for securing the smaller end of the body to the end of the exhaust pipe of an engine in axial alignment therewith and with the wall of the smaller end spaced radically outward of the wall of the exhaust pipe, the wall of said body provided with a plurality of apertures, and means for directing air inwardly through said apertures.
2. A muffler comprising an interiorly unobstructed, hollow, open-ended frusto-conical body having its exterior wall exposed to the atmosphere and provided with an outwardly-flared portion on its smaller end, means for securing the smalled end of the body to the end of the exhaust 20 pipe of an engine in axial alignment therewith and with the wall of the smaller end spaced radically outward of the wall of the exhaust pipe, and a plurality of tongues struck-up from said body and extending toward the smaller end thereof.
3. A muffler comprising an interiorly unobstructed, hollow, open-ended frusto-conical body having its exterior wall exposed to the atmosphere and provided with an outwardly-flared portion on its smaller end, the wall of said body provided with a plurality of apertures, means for directing air through said apertures, and an openended tube of relatively small diameter secured in the smaller end of the frusto-conical body and having its inner end tapered.
4. A muffler comprising an open-ended, hollow, frusto-conical body having its exterior wall exposed to the atmosphere and provided with an outwardly-flared portion at its smaller end, means for securing the smaller end of the body to the exhaust pipe of an engine in axial alignment with the exhaust pipe, the wall of the body being radially spaced from the exhaust pipe, said mufller body being provided with a plurality of apertures, and means for directing air through said apertures comprising cup-shaped tongues struckup from the body and extendin toward the smaller end thereof.
WALTON W. CUSHMAN.
REFERENCES CITED The 'following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 25 1,382,690 Stokes June 28, 1921 1,561,859 Kemble Nov. 17, 1925 2,389,059 Kurth Nov. 13, 1945 FOREIGN PATENTS 30 Number Country Date 608,447 France July 27, 1926 746,759 France June 6, 1933 771,314 France Oct. 5, 1934
US4221A 1948-01-26 1948-01-26 Air-cooled exhaust muffler with frusto-conical body Expired - Lifetime US2586788A (en)

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2685936A (en) * 1950-08-08 1954-08-10 Lockheed Aircraft Corp Sound reduction equipment for use with jet-propulsion units
US2785878A (en) * 1953-09-16 1957-03-19 Earl W Conrad Porous walled conduit for fluid cooling
US2866316A (en) * 1956-04-25 1958-12-30 United Aircraft Corp Thrust reversing and silencing
US2974744A (en) * 1961-03-14 Silencer
US4198817A (en) * 1977-12-13 1980-04-22 Toyota Jidosha Kogyo Kabushiki Kaisha Exhaust gas diffuser
US4905633A (en) * 1987-10-16 1990-03-06 Yoshiaki Kakuta Air cooling mechanism for internal center of internal combustion engine
US4909034A (en) * 1987-12-21 1990-03-20 Yoshiaki Kakuta Low speed back pressure generator for affecting torque of an internal combustion engine
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
US20080072582A1 (en) * 2006-09-21 2008-03-27 Gm Global Technology Operations, Inc. Exhaust gas cooler
US20080092533A1 (en) * 2006-10-20 2008-04-24 Paul Tennison Exhaust System for an Engine
US20080110164A1 (en) * 2006-11-14 2008-05-15 Tenneco Automotive Operating Company Inc. Device for lowering tail pipe exhaust temperature
US20090057056A1 (en) * 2007-08-31 2009-03-05 Fred Baumgartner Vehicular exhaust resonator with cooling feature
US20090282818A1 (en) * 2008-04-18 2009-11-19 Martin Keller Tail pipe exhaust cooling device
US20090293836A1 (en) * 2008-05-30 2009-12-03 Schindler Rodney A Engine exhaust cooler and air pre-cleaner aspirator
US20120017566A1 (en) * 2005-08-16 2012-01-26 Daimler Trucks North America Llc Vehicle exhaust dilution and dispersion device
US20140174094A1 (en) * 2012-12-21 2014-06-26 United Technologies Corporation APU Exhaust Housing Perforated Ring
USD734229S1 (en) 2014-01-21 2015-07-14 Nelson Global Products, Inc. Gaseous diluter
USD836050S1 (en) 2016-08-29 2018-12-18 Nelson Global Products, Inc. Gaseous diluter
USD836512S1 (en) 2016-08-29 2018-12-25 Nelson Global Products, Inc. Gaseous diluter

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1382690A (en) * 1917-10-27 1921-06-28 Stokes Charles Lawrence Apparatus for silencing and exhausting gases and method therffor
US1561859A (en) * 1921-11-12 1925-11-17 Thomas S Kemble Muffler construction
FR608447A (en) * 1925-12-29 1926-07-27 Rochat Et Barthelemy Ets Flame arrestor silencer for explosion engines
FR746759A (en) * 1932-02-23 1933-06-06 Improvements in the processes and means used, in particular, to emit fumes or gases
FR771314A (en) * 1933-06-28 1934-10-05 Static ejection system for the exhaust pipes of internal combustion or external combustion engines
US2389059A (en) * 1942-06-01 1945-11-13 Anemostat Corp America Means for treating inflammable gases

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1382690A (en) * 1917-10-27 1921-06-28 Stokes Charles Lawrence Apparatus for silencing and exhausting gases and method therffor
US1561859A (en) * 1921-11-12 1925-11-17 Thomas S Kemble Muffler construction
FR608447A (en) * 1925-12-29 1926-07-27 Rochat Et Barthelemy Ets Flame arrestor silencer for explosion engines
FR746759A (en) * 1932-02-23 1933-06-06 Improvements in the processes and means used, in particular, to emit fumes or gases
FR771314A (en) * 1933-06-28 1934-10-05 Static ejection system for the exhaust pipes of internal combustion or external combustion engines
US2389059A (en) * 1942-06-01 1945-11-13 Anemostat Corp America Means for treating inflammable gases

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2974744A (en) * 1961-03-14 Silencer
US2685936A (en) * 1950-08-08 1954-08-10 Lockheed Aircraft Corp Sound reduction equipment for use with jet-propulsion units
US2785878A (en) * 1953-09-16 1957-03-19 Earl W Conrad Porous walled conduit for fluid cooling
US2866316A (en) * 1956-04-25 1958-12-30 United Aircraft Corp Thrust reversing and silencing
US4198817A (en) * 1977-12-13 1980-04-22 Toyota Jidosha Kogyo Kabushiki Kaisha Exhaust gas diffuser
US4905633A (en) * 1987-10-16 1990-03-06 Yoshiaki Kakuta Air cooling mechanism for internal center of internal combustion engine
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
US4909034A (en) * 1987-12-21 1990-03-20 Yoshiaki Kakuta Low speed back pressure generator for affecting torque of an internal combustion engine
US20120017566A1 (en) * 2005-08-16 2012-01-26 Daimler Trucks North America Llc Vehicle exhaust dilution and dispersion device
US20080072582A1 (en) * 2006-09-21 2008-03-27 Gm Global Technology Operations, Inc. Exhaust gas cooler
US7461506B2 (en) * 2006-09-21 2008-12-09 Gm Global Technology Operations, Inc. Exhaust gas cooler
US20080092533A1 (en) * 2006-10-20 2008-04-24 Paul Tennison Exhaust System for an Engine
US7762064B2 (en) * 2006-10-20 2010-07-27 Ford Global Technologies, Llc Exhaust system for an engine
US20100269493A1 (en) * 2006-10-20 2010-10-28 Ford Global Technologies, Llc Exhaust system for an engine
US20080110164A1 (en) * 2006-11-14 2008-05-15 Tenneco Automotive Operating Company Inc. Device for lowering tail pipe exhaust temperature
US7913489B2 (en) 2006-11-14 2011-03-29 Tenneco Automotive Operating Company, Inc. Device for lowering tail pipe exhaust temperature
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
CN102007275A (en) * 2008-04-18 2011-04-06 坦尼科汽车营业公司 Tail pipe exhaust cooling device
WO2009136998A3 (en) * 2008-04-18 2010-01-07 Tenneco Automotive Operating Company Inc. Tail pipe exhaust cooling device
JP2011518281A (en) * 2008-04-18 2011-06-23 テネコ オートモティブ オペレーティング カンパニー インコーポレイテッド Tail pipe exhaust cooling system
US20090282818A1 (en) * 2008-04-18 2009-11-19 Martin Keller Tail pipe exhaust cooling device
US8272210B2 (en) 2008-04-18 2012-09-25 Tenneco Automotive Operating Company Inc. Tail pipe exhaust cooling device
US7833301B2 (en) 2008-05-30 2010-11-16 Deere & Company Engine exhaust cooler and air pre-cleaner aspirator
US20090293836A1 (en) * 2008-05-30 2009-12-03 Schindler Rodney A Engine exhaust cooler and air pre-cleaner aspirator
US20140174094A1 (en) * 2012-12-21 2014-06-26 United Technologies Corporation APU Exhaust Housing Perforated Ring
USD734229S1 (en) 2014-01-21 2015-07-14 Nelson Global Products, Inc. Gaseous diluter
USD836050S1 (en) 2016-08-29 2018-12-18 Nelson Global Products, Inc. Gaseous diluter
USD836512S1 (en) 2016-08-29 2018-12-25 Nelson Global Products, Inc. Gaseous diluter

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