US3897852A - Diaphragm silencer assembly for engine muffler - Google Patents

Diaphragm silencer assembly for engine muffler Download PDF

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US3897852A
US3897852A US391148A US39114873A US3897852A US 3897852 A US3897852 A US 3897852A US 391148 A US391148 A US 391148A US 39114873 A US39114873 A US 39114873A US 3897852 A US3897852 A US 3897852A
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diaphragm
diaphragm element
exhaust gas
central post
ring member
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US391148A
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Edward H Hoffman
Clifford F Kennedy
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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
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
    • F01N1/161—Silencing apparatus characterised by method of silencing by using movable parts for adjusting resonance or dead chambers or passages to resonance or dead chambers
    • F01N1/163—Silencing apparatus characterised by method of silencing by using movable parts for adjusting resonance or dead chambers or passages to resonance or dead chambers by means of valves
    • 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
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • 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
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/12—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using spirally or helically shaped channels
    • 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
    • F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
    • F01N1/22—Silencing apparatus characterised by method of silencing by using movable parts the parts being resilient walls
    • 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/20—Chambers being formed inside the exhaust pipe without enlargement of the cross section of the pipe, e.g. resonance chambers

Definitions

  • a diaphragm assembly for use in providing inertial dampening and valve action in an internal combustion engine muffler includes a flexible diaphragm element which is mounted over a centrally located post in con Centric relationship therewith The central post is supported on an outer ringshaped member by means of a spider structure. The edges of the diaphragm element abut against the ring memher in response to back pressure from the ambient atmosphere to effectively provide a closing action. These edges are forced away from ring member by exhaust gas pressure. thus providing opening action to permit release of the exhaust gases.
  • a muffler which utilizes a diaphragm assembly having one or more diaphragm elements for providing inertial dampening and affording valve action which greatly improves the performance of the muffler.
  • the present invention involves a diaphragm assembly which operates in the same general manner as those described in our aforementioned prior application but which utilizes only a single diaphragm element with a heat shield and a somewhat different structural implementation.
  • the device of the present invention while less effective in its silencing action than diaphragm assemblies having a plurality of diaphragm elements. nevertheless affords the advantage of greater simplicity and economy of construction.
  • FIG. 1 is an clevational, cross-sectional view of a preferred embodiment of the invention as incorporated into a muffler assembly;
  • FIG. 2 is a view taken along the plane indicated by 22 in FIG. 1;
  • P16. 3 is a plan view of the preferred embodiment of the diaphragm assembly of the invention showing the side thereof opposite to that shown in FIG. 2.
  • frame 11 includes a ring portion 12. Extending from ring portion 12, in a direction substantially normal to the surface of the ring, is an annular lip 14. Lip 14 has a pair of indentations 14a formed therein which are used to retain the ring against rotation in muffler assembly 20. Extending inwardly from ring 12 are arms 17 which form a spider assembly which supports a centrally located ring 18. Central post 22 is supported in ring 18 by means of flanged end por tion 25 of the post assembly which is flared and pressed against the face of ring 18 to effectively form a retaining rivet.
  • Central post 22 has, integrally formed therewith. an end disc 28. Fitted over central post 22 is a flexible diaphragm element which may be made of a suitable high temperature silicone rubber.
  • a heat shield 31 for the diaphragm which may be of stainless steel is mounted in front of the diaphragm. This shield serves not only to protect the diaphragm from the heat of the exhaust gasses but also operates as a sound reflector which it has been found reduces the noise level.
  • the central portion 30a of the diaphragm element is widened so that it fits snuggly between disc 28 and ring 18 in resilient retention therebetween.
  • the outer portions 30b of the diaphragm element are free to move axially in response to gas pressure.
  • Diaphragm 30 has an annular lip 30c running around the periphery thereof which seals against ring [2 in response to pressure on the outer surface of the diaphragm.
  • Diaphragm 30, further. has a plurality of apertures 30d formed therethrough which are utilized to provide pressure relief in handling high back pressures.
  • a hexagonal indentation 300 Surrounding each of apertures 30d is a hexagonal indentation 300 formed in the surface of the diaphragm. These indentations serve to break up and diffuse sound waves, thus aiding in the silencing action.
  • the diaphragm assembly is retained at the exhaust end of muffler 20 means of an annular snap ring 40 which is retained in annular indentation 41 formed along the edge portion ofthe main body 20 of the muffler.
  • Exhaust gas is fed from central muffler chamber 45 through flared outlet 46 to the diaphragm assembly.
  • the exhaust pressure forces the outer portions of diaphragm element 30 outwardly with lip portion 30(' moving away from its engagement with ring [2.
  • the outward movement of diaphragm element 30 is limited by disc 28 as indicated by the dotted lines.
  • a back pressure i.e. a positive pressure differential between the ambient atmosphere and muffler chamber 45
  • the outer portions of the diaphragm element are forced inwardly with lip 30c sealing against ring 12, thus alleviating noise effects incidental to such back pressure effects.
  • Apcrtures 30d provide pressure relief in the ease of high back pressures, thus preventing dis tortion of the diaphragm which might result in damage thereto.
  • Ribs 30f may be provided on the diaphragm to stiffen its structure.
  • the device of the invention thus provides a simple and economical diaphragm assembly for providing inertial dampening and valving in response to gas pressure to improve the silencing action of an internal combustion engine muffler.
  • a diaphragm assembly for use in an engine muffler to provide inertial dampening and to afford valve action comprising:
  • a flexible circular diaphragm element having a plurality of apertures formed therethrough to provide pressure relief for high back pressure
  • a ring member having a flat faced portion and an inside diameter slightly less than the diameter of said diaphragm element
  • a spider structure for supporting said central post from said ring member, said diaphragm element being mounted over said central post in concentric relationship therewith, with the peripheral edges of said diaphragm element abutting against the flat faced portion of said ring member,

Abstract

A diaphragm assembly for use in providing inertial dampening and valve action in an internal combustion engine muffler includes a flexible diaphragm element which is mounted over a centrally located post in concentric relationship therewith. The central post is supported on an outer ringshaped member by means of a spider structure. The edges of the diaphragm element abut against the ring member in response to back pressure from the ambient atmosphere to effectively provide a closing action. These edges are forced away from ring member by exhaust gas pressure, thus providing opening action to permit release of the exhaust gases.

Description

United States Patent Hoffman et a1. 1 1 Aug. 5, 1975 15 1 DIAPHRAGM SILENCER ASSEMBLY FOR 3.561.561 2/1971 Trainor 181/37 X ENGINE MUFFLER 3.612.214 111/1971 B11111 et a1. 1111/37 E H H Cm d F 3.754.740 8/1973 P|pcr 1 239/514 76 I t d d l 1 fi' 'g'gz g Cam FOREIGN PATENTS OR APPLICATIONS 578.839 6/1959 Canada 219/534 1 Flledr 1973 1.251.775 9/1960 France 1111/49 853.861) 11/1960 United Kingdom..... 1111/41 A [2]] Appl' 110,577 5119311 Austria. 181/47 A Relaled US. Application Data 754.6911 11/1933 France. 181/36 B 1972, Pat, No. 3.779.340.
[52] US. Cl 181/45; 181/64 R; 239/534 [51] Int. Cl. FOln 1/00 [58] Field of Search 181/36 R, 36 B, 47 A. 37. 181/57, 64. 45; Z39/S33 S34 [56] References Cited UNITED STATES PATENTS 671.523 4/1901 Zohbiller 181/37 1.376.263 4/1921 Emerson... .1 181/57 1.376.263 4/1921 Emerson 181/47 A 1.666.005 4/1928 Culp 181/57 1.818.796 8/1931 Feyens 123/75 1,864,915 6/1932 Kosterman. 181/57 2.933.148 4/1960 Hendry 181/47 A -1106.985 10/1953 Recupito... 181/37 X 3.334.819 5/1967 Olavson 1. 239/534 3.415145 12/1968 Yamamoto et a1. 128/147 Primary Emmi! r-Stephen J. Tomsky Ass/stun! Llmmiuer-Vit W. Miska I57] ABSTRACT A diaphragm assembly for use in providing inertial dampening and valve action in an internal combustion engine muffler includes a flexible diaphragm element which is mounted over a centrally located post in con Centric relationship therewith The central post is supported on an outer ringshaped member by means of a spider structure. The edges of the diaphragm element abut against the ring memher in response to back pressure from the ambient atmosphere to effectively provide a closing action. These edges are forced away from ring member by exhaust gas pressure. thus providing opening action to permit release of the exhaust gases.
3 Claims. 3 Drawing Figures 31 kljhih 30f i 18 3061 a 46 a r/ I. a 1
&\
PATENTEU AUG 51% FIG. I
DIAPHRAGM SILENCER ASSEMBLY FOR ENGINE MUFFLER This'a pplication isa (:ontinuation in Part of our ap plication S er. N0. 296,072; filed C1. 10, 1972, now U;S. Patent No. 3,779,340.
i This lt'lYEtttlOIlJ'ClfltCS to internal combustion engine mufflers and more'particularlyto a "diaphragm assembly for use in such a muffler.
In our application Ser. No. 296,072 tiled Oct. 10. 1972, a muffler is described which utilizes a diaphragm assembly having one or more diaphragm elements for providing inertial dampening and affording valve action which greatly improves the performance of the muffler. The present invention involves a diaphragm assembly which operates in the same general manner as those described in our aforementioned prior application but which utilizes only a single diaphragm element with a heat shield and a somewhat different structural implementation. The device of the present invention, while less effective in its silencing action than diaphragm assemblies having a plurality of diaphragm elements. nevertheless affords the advantage of greater simplicity and economy of construction.
It is therefore the principle object of this invention to provide a diaphragm assembly for use in an internal combustion engine muffler of simpler and more economical construction.
Other objects of my invention will become apparent as the description proceeds in connection with the accompanying drawings, of which:
FIG. 1 is an clevational, cross-sectional view ofa preferred embodiment of the invention as incorporated into a muffler assembly;
FIG. 2 is a view taken along the plane indicated by 22 in FIG. 1; and
P16. 3 is a plan view of the preferred embodiment of the diaphragm assembly of the invention showing the side thereof opposite to that shown in FIG. 2.
Referring now to the figures. frame 11 includes a ring portion 12. Extending from ring portion 12, in a direction substantially normal to the surface of the ring, is an annular lip 14. Lip 14 has a pair of indentations 14a formed therein which are used to retain the ring against rotation in muffler assembly 20. Extending inwardly from ring 12 are arms 17 which form a spider assembly which supports a centrally located ring 18. Central post 22 is supported in ring 18 by means of flanged end por tion 25 of the post assembly which is flared and pressed against the face of ring 18 to effectively form a retaining rivet.
Central post 22 has, integrally formed therewith. an end disc 28. Fitted over central post 22 is a flexible diaphragm element which may be made of a suitable high temperature silicone rubber. A heat shield 31 for the diaphragm which may be of stainless steel is mounted in front of the diaphragm. This shield serves not only to protect the diaphragm from the heat of the exhaust gasses but also operates as a sound reflector which it has been found reduces the noise level. The central portion 30a of the diaphragm element is widened so that it fits snuggly between disc 28 and ring 18 in resilient retention therebetween. The outer portions 30b of the diaphragm element are free to move axially in response to gas pressure. In the absence of any pres sure differential, between the opposite faces thereof, the diaphragm element is resiliently retained in the position shown in FIG. 1, with the edges thereof abutting against ring 12. Diaphragm 30 has an annular lip 30c running around the periphery thereof which seals against ring [2 in response to pressure on the outer surface of the diaphragm.
Diaphragm 30, further. has a plurality of apertures 30d formed therethrough which are utilized to provide pressure relief in handling high back pressures. Surrounding each of apertures 30d is a hexagonal indentation 300 formed in the surface of the diaphragm. These indentations serve to break up and diffuse sound waves, thus aiding in the silencing action.
The diaphragm assembly is retained at the exhaust end of muffler 20 means of an annular snap ring 40 which is retained in annular indentation 41 formed along the edge portion ofthe main body 20 of the muffler.
Exhaust gas is fed from central muffler chamber 45 through flared outlet 46 to the diaphragm assembly. The exhaust pressure forces the outer portions of diaphragm element 30 outwardly with lip portion 30(' moving away from its engagement with ring [2. The outward movement of diaphragm element 30 is limited by disc 28 as indicated by the dotted lines. Where there is a back pressure. i.e. a positive pressure differential between the ambient atmosphere and muffler chamber 45, the outer portions of the diaphragm element are forced inwardly with lip 30c sealing against ring 12, thus alleviating noise effects incidental to such back pressure effects. Apcrtures 30d provide pressure relief in the ease of high back pressures, thus preventing dis tortion of the diaphragm which might result in damage thereto. Ribs 30fmay be provided on the diaphragm to stiffen its structure.
The device of the invention thus provides a simple and economical diaphragm assembly for providing inertial dampening and valving in response to gas pressure to improve the silencing action of an internal combustion engine muffler.
While the invention has been described and illustrated in detail, it is to be clearly understood that this is intended by way ofillustration and example only, and is not to be taken by way of limitation, the spirit and scope of this invention being limited only by the terms of the following claims.
We claim:
1. A diaphragm assembly for use in an engine muffler to provide inertial dampening and to afford valve action comprising:
a flexible circular diaphragm element having a plurality of apertures formed therethrough to provide pressure relief for high back pressure,
a ring member having a flat faced portion and an inside diameter slightly less than the diameter of said diaphragm element,
a central post.
a spider structure for supporting said central post from said ring member, said diaphragm element being mounted over said central post in concentric relationship therewith, with the peripheral edges of said diaphragm element abutting against the flat faced portion of said ring member,
a member attached to one end of said central post for limiting the movement of said diaphragm element in response to the exhaust gas pressure, and
means for feeding the exhaust gas received by the muffler from the engine to said diaphragm element,
surface thereof facing towards the exhaust gas for breaking up sound waves.
3. The device of claim 2 and further including a heat shield member mounted between said diaphragm element and the means for feeding the exhaust gas thereto. said heat shield member shielding said diaphragm element from the heat of the exhaust gasses.
e e i Its

Claims (3)

1. A diaphragm assembly for use in an engine muffler to provide inertial dampening and to afford valve action comprising: a flexible circular diaphragm element having a plurality of apertures formed therethrough to provide pressure relief for high back pressure, a ring member having a flat faced portion and an inside diameter slightly less than the diameter of said diaphragm element, a central post, a spider structure for supporting said central post from said ring member, said diaphragm element being mounted over said central post in concentric relationship therewith, with the peripheral edges of said diaphragm element abutting against the flat faced portion of said ring member, a member attached to one end of said central post for limiting the movement of said diaphragm element in response to the exhaust gas pressure, and means for feeding the exhaust gas received by the muffler from the engine to said diaphragm element, the outer portions of said diaphragm element being free to move away from said ring member in response to exhaust gas pressure, and with the edges thereof in sealing engagement against said ring in response to back pressure from the ambient atmosphere.
2. The device of claim 1 wherein said diaphragm elements have a plurality of indentations formed on the surface thereof facing towards the exhaust gas for breaking up sound waves.
3. The device of claim 2 and further including a heat shield member mounted between said diaphragm element and the means for feeding the exhaust gas thereto, said heat shield member shielding said diaphragm element from the heat of the exhaust gasses.
US391148A 1972-10-10 1973-08-23 Diaphragm silencer assembly for engine muffler Expired - Lifetime US3897852A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0119047A1 (en) * 1983-03-11 1984-09-19 Bendix Limited Air dryer silencer
US5435347A (en) * 1993-07-22 1995-07-25 Donaldson Company, Inc. Exhaust systems for motorized vehicles
US6571910B2 (en) 2000-12-20 2003-06-03 Quiet Storm, Llc Method and apparatus for improved noise attenuation in a dissipative internal combustion engine exhaust muffler
US6644436B2 (en) * 2001-03-21 2003-11-11 Daimlerchrysler Ag Device for noise configuration in a motor vehicle
US20080023264A1 (en) * 2006-07-27 2008-01-31 Pacini Larry W Muffler having adjustable butterfly valve for improved sound attenuation and engine performance
US20080236680A1 (en) * 2007-03-29 2008-10-02 Kwin Abram Passive valve for attenuation of low frequency noise
US9376947B2 (en) 2007-03-29 2016-06-28 Faurecia Emissions Control Technologies Usa, Llc Hybrid valve for attenuation of low frequency noise
US9540995B2 (en) 2012-03-06 2017-01-10 KATCON USA, Inc. Exhaust valve assembly
US20210268893A1 (en) * 2018-06-22 2021-09-02 Renault S.A.S. Electric machine cooled by a dielectric heat transfer fluid

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US671523A (en) * 1900-12-06 1901-04-09 Anton Lohbiller Safety-valve.
US1376263A (en) * 1919-12-11 1921-04-26 Emerson Victor Lee Muffler for exhaust-pipes
US1666005A (en) * 1925-05-23 1928-04-10 Arthur J Culp Exhaust trap
US1818796A (en) * 1927-04-15 1931-08-11 Ind General Res Corp Sa Soc Ge Internal-combustion engine
US1864915A (en) * 1929-06-14 1932-06-28 Henry T Kosterman Muffler
US2933148A (en) * 1957-12-09 1960-04-19 Adolph R Hendry Engine muffler
US3106985A (en) * 1960-12-05 1963-10-15 Kenneth J Recupito Muffler apparatus
US3334819A (en) * 1966-03-31 1967-08-08 Eimco Corp Gas diffusion apparatus
US3415245A (en) * 1965-03-08 1968-12-10 Y2 Associates Noise-suppression diving apparatus
US3561561A (en) * 1969-11-28 1971-02-09 John B Trainor Sound attenuating device
US3612214A (en) * 1970-11-19 1971-10-12 Blatt Leland F Pressure release safety industrial air exhaust silencer
US3754740A (en) * 1971-02-18 1973-08-28 Westinghouse Electric Corp Gas distributor

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US671523A (en) * 1900-12-06 1901-04-09 Anton Lohbiller Safety-valve.
US1376263A (en) * 1919-12-11 1921-04-26 Emerson Victor Lee Muffler for exhaust-pipes
US1666005A (en) * 1925-05-23 1928-04-10 Arthur J Culp Exhaust trap
US1818796A (en) * 1927-04-15 1931-08-11 Ind General Res Corp Sa Soc Ge Internal-combustion engine
US1864915A (en) * 1929-06-14 1932-06-28 Henry T Kosterman Muffler
US2933148A (en) * 1957-12-09 1960-04-19 Adolph R Hendry Engine muffler
US3106985A (en) * 1960-12-05 1963-10-15 Kenneth J Recupito Muffler apparatus
US3415245A (en) * 1965-03-08 1968-12-10 Y2 Associates Noise-suppression diving apparatus
US3334819A (en) * 1966-03-31 1967-08-08 Eimco Corp Gas diffusion apparatus
US3561561A (en) * 1969-11-28 1971-02-09 John B Trainor Sound attenuating device
US3612214A (en) * 1970-11-19 1971-10-12 Blatt Leland F Pressure release safety industrial air exhaust silencer
US3754740A (en) * 1971-02-18 1973-08-28 Westinghouse Electric Corp Gas distributor

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0119047A1 (en) * 1983-03-11 1984-09-19 Bendix Limited Air dryer silencer
US5435347A (en) * 1993-07-22 1995-07-25 Donaldson Company, Inc. Exhaust systems for motorized vehicles
US6571910B2 (en) 2000-12-20 2003-06-03 Quiet Storm, Llc Method and apparatus for improved noise attenuation in a dissipative internal combustion engine exhaust muffler
US6644436B2 (en) * 2001-03-21 2003-11-11 Daimlerchrysler Ag Device for noise configuration in a motor vehicle
US20080023264A1 (en) * 2006-07-27 2008-01-31 Pacini Larry W Muffler having adjustable butterfly valve for improved sound attenuation and engine performance
US20080236680A1 (en) * 2007-03-29 2008-10-02 Kwin Abram Passive valve for attenuation of low frequency noise
US8453672B2 (en) * 2007-03-29 2013-06-04 Emcon Technologies Llc Passive valve for attenuation of low frequency noise
US9376947B2 (en) 2007-03-29 2016-06-28 Faurecia Emissions Control Technologies Usa, Llc Hybrid valve for attenuation of low frequency noise
US9540995B2 (en) 2012-03-06 2017-01-10 KATCON USA, Inc. Exhaust valve assembly
US20210268893A1 (en) * 2018-06-22 2021-09-02 Renault S.A.S. Electric machine cooled by a dielectric heat transfer fluid

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