US3557904A - Automobile exhaust muffler - Google Patents
Automobile exhaust muffler Download PDFInfo
- Publication number
- US3557904A US3557904A US886839A US3557904DA US3557904A US 3557904 A US3557904 A US 3557904A US 886839 A US886839 A US 886839A US 3557904D A US3557904D A US 3557904DA US 3557904 A US3557904 A US 3557904A
- Authority
- US
- United States
- Prior art keywords
- passage
- housing
- exhaust
- return
- turnaround
- 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
- 238000005192 partition Methods 0.000 claims abstract description 24
- 230000008878 coupling Effects 0.000 claims abstract description 7
- 238000010168 coupling process Methods 0.000 claims abstract description 7
- 238000005859 coupling reaction Methods 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 42
- 238000013016 damping Methods 0.000 claims description 4
- 238000000638 solvent extraction Methods 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 2
- 239000002184 metal Substances 0.000 description 4
- 230000002238 attenuated effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003466 welding Methods 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
- F01N1/02—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
- F01N1/084—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling the gases flowing through the silencer two or more times longitudinally in opposite directions, e.g. using parallel or concentric tubes
-
- 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
- F01N2490/15—Plurality of resonance or dead chambers
- F01N2490/155—Plurality of resonance or dead chambers being disposed one after the other in flow direction
Definitions
- An exhaust gas muffler comprises a housing containing a pair of laterally spaced exhaust conduits opening into a transverse turnaround passage within the housing for conducting exhaust gas transversely from one conduit to the other.
- a portion of the turnaround passage laterally of the openings of the conduits thereinto comprises a high frequency tuning chamber separated from the remainder of the turnaround passage by a partition perforated to provide an acoustical coupling between the two portions of the turnaround passage to attenuate high frequency sound waves in the exhaust gas.
- an outer sheet metal housing encloses a space of generally oval transverse cross section through which the exhaust gases pass in a convoluted path.
- a forward exhaust pipe section conducts the gases from the engine exhaust manifold and through the front end of the housing into a transverse rear turnaround passage, wherein the gases flow transversely to a return flow exhaust pipe section parallel to and spaced from the forward pipe section.
- the return pipe section conducts the exhaust gases forwardly to a transverse front turnaround passage, wherein the gases again flow transversely to a tailpipe section parallel to and spaced from both of the other pipe sections.
- the tailpipe section then conducts the gases rearwardly through the rear end of the housing and discharges to atmosphere.
- the turnaround passages are formed within the housing by transverse sheet metal baffles, usually in cooperation with one or both endwalls of the housing, which extend from side to side and top to bottom within the housing to reinforce the latter and support the exhaust pipe sections.
- Sound attenuating means comprise openings within the exhaust pipe sections communicating with the major dead spaces within the housing. The openings and dead spaces cooperate to resonate out of phase with sound waves in the exhaust gases flow and thereby to muffle or damp these waves and the noise resulting therefrom.
- Comparatively high frequency sounds are similarly attenuated, but by means of a sleeve arranged coaxially around one of the pipe sections.
- the annular space between the sleeve and and pipe section is closed at its ends to comprise a high frequency resonator or tuning chamber and is acoustically coupled with the interior of the coaxial pipe section by a plurality of small resonator openings or louvers.
- the dimensions of the louvers and tuning chamber are determined in accordance with the frequency of the sound waves to be attenuated. Suolua muffler has been reasonably satisfactory for many years, but :i'tsfull potential for any given size has never been realized.
- a concept of the present invention is to provide a partition within the turnaround passage to separate its aforesaid unused portion from its active portion, which latter portion conducts the exhaust gas. As a consequence turbulence within the formerly unused portion and impedance to the exhaust flow are reduced. In addition, the formerly unused space between the baffle and sidewall of the housing is now available for use as a high frequency tuning chamber. By forming louvers or resonator openings in the partition to acoustically couple active and formerly unused portions of the turnaround passage, high frequency sounds within the exhaust flow are attenuated.
- the resonator thus formed may either supplant the conventional sleeve-type high frequency resonator formerly em ployed, with consequent cost savings and a reduction in the overall dimensions of the muffler, or it may supplement the conventional high frequency resonator for increased muffler efficiency.
- the resonator fonned in accordance with the present invention is advantageously located within the turnaround passage at the region of maximum turbulence and disruption to exhaust gas flow and thus by reason of its location proximate a significant source of high frequency sound is more effective for sound attenuation than is the conventional high frequency resonators located coaxially around an exhaust pipe section remote from the turnaround passage.
- FIG. 1 is a schematic longitudinal sectional view through a muffler embodying the present invention.
- FIG. 2 is a sectional view taken in the direction of the arrows substantially along the line 2-2 of FIG. 1.
- FIG. 3 is a view similar to FIG. 2, showing a modification.
- a muffler comprising a conventional sheet metal housing or canister 10 of generally oval section and closed by front and rear sheet metal endwalls 11 and 12 respectively.
- Three transverse baffle plates 13, 14 and 15 are suitably secured within the housing 10 to provide a front turnaround passage 16 between the endwall 11 and plate 13, a rear turnaround passage 17 between the plates 14 and 15, and a rear resonator chamber 18 between the plate 15 and endwall 12.
- a cylindrical tuning neck or throat 19 extends axially through the plate 15 from the rear turnaround passage 17 into the chamber 18 and is dimensioned with respect to the volume of the chamber 18 in accordance with conventional practice for attenuating comparatively low frequency sound waves carried by the exhaust gases passing through the muffler.
- Exhaust gases are carried through the muffler by three ex haust conduit sections comprising an inlet section 20, a return or reverse flow section 21, and an exhaust section 22.
- the inlet section 20 is enlarged at its front end 23 to sleeve over an exhaust conduit not shown connected with the exhaust header from the automobile engine. From the forward end 23, the conduit section 20 extends axially into the housing 10 at a lateral location through flanged openings 24 lanced in the front endwall l l and baffle plates 13 and 14. Similarly the tuning neck 19 is secured within a flanged opening 27 lanced in the plate 15.
- Return section 21 extends axially near the opposite side of the muffler through flanged openings 28 lanced in the plates 13 and 14, and the exhaust section 22 extends through flanged openings 30 lanced in the plates l3, l4, l5, and endwall 12 at locations between the sections 20 and 21.
- the rear end of the section 22 is enlarged at 34 to provide a sleeve connection with the customary tailpipe section for discharging exhaust to the atmosphere.
- the assembly of the conduit section, muffler housing, and baffle plates is secured together as for example by welding at the flanged openings in mutually supporting relationship.
- the sections 20, 21, and 22 are provided with a plurality of openings or louvers 35 opening radially into a resonator chamber 36 located between the baffles 13 and 14. By suitably determining the size and number of the openings 35 with respect to the volume of the resonator 36, additional muffling of comparatively low frequency sounds is accomplished. It is also customary to provide a sleeve 37 spaced radially from one of the exhaust conduit sections, as for example the section 21, to provide an annular tuning chamber 38 between the sleeve 37 and conduit section 21 cooperable with a plurality of openings or louvers 39 in the section 21 communicating with the space 38 for attenuating comparatively high frequency sounds.
- the structure described thus far may be conventional in construction and in operation. Specifically, the exhaust gases from the automobile engine flow through the inlet section 20 into the turnaround passage 17, thence transversely in the latter passage to the return conduit section 21, thence forwardly into the front turnaround passage 16, transversely in the latter passage to the exhaust section 22, and finally in i a.
- the region 40 of the turnaround passage 17 for example laterally of the conduit sections 20 and 21 is a source of turbulence and impedance for the gas flow from the section 20 to the section 21. Furthermore this lateral volume 40 in the conventional turnaround passage serves no useful purpose in conducting exhaust gases. In accordance with the present invention, this lateral space 40 is separated from the active or useful central space of the tufnaround passage 17 by a partition 41 extending axially between the plates 14 and 15 and closely around the openings of the conduit sections 20 and 21 into the passage 17, FIG. 2.
- the space 40 may thus comprise a tuning chamber for comparatively high frequency sounds and is acoustically coupled with the aforementioned active volume of the passage 17 inwardly of the partition 41 by a plurality of openings or louvers 42 dimensioned in accordance with the volume of the space 40 to attenuate such high frequency sounds.
- a comparatively unused space 43 between the baffle 13 and front end 11 is separated from the active volume of the turnaround passage 16 by a partition 44 extending closely around the openings of the conduit sections 21 and 22 into the turnaround passage 16, substantially in the manner of partition 41.
- a plurality of openings or louvers 45 are providedin the partition 44 to acoustically couple the volume 43 and passage 16 for attenuating comparatively high frequency sounds in the exhaust gases.
- the partition 41 instead of comprising a continuous sheet spaced from the sidewalls of the housing 10, FIG. 2, may comprise two separate parts 41' welded at their ends to the housing sidewall 10, FIG. 3..
- turbulent flow within the turnaround passages 16 and 17 is reduced and sound attenuat ing means for high frequency sounds proximate the regions of maximum turbulence resulting from abrupt changes in the direction of the gas flow between the axial and transverse directions are provided.
- the high frequency sound attenuation provided by the chambers 40 and 43 may be provided to supplement the sleeve 37 and thereby achieve greater muffler efficiency without increasing the muffler volume, or the spaces-40 and 43 may be employed to replace the sleeve 37, with consequent economy in the construetion'of the mufflefi and also to render a larger portion of the return conduit section 21 available for attenuating lower frequency sounds.
- baffle means partitioning said housing to provide a gas flow turnaround passage therein
- exhaust conduit means cooperable with said passage for conducting said gases through said housing comprising a pair of conduit sections opening into said passage at spaced locations, at least one of said conduit sections opening into said passage at a location spaced from the interior of said housing to provide a space proximate said interior comparatively unused for conducting said gases through said housing, and l D. means for attenuating comparatively high frequency sounds in said gases comprising:
- said passage comprising a rear turnaround passage spaced rearwardly from the front end of said housing, said baffle means partitioning said housing to provide a front turnaround passage adjacent said front end; said pair of conduit sections including an inlet sec tion and a return' section, said inlet section extending rearwardly into said housing through said front end and front turnaround passage to said rear turnaround passage, said return section connecting said rear and front'turnaround passages, said exhaust conduit means also including an exhaust section communicating'with said front turnaround passage and ex-' tending rearwardly therefrom through said rear turnaround passage and the rear end of said housing.
- said inlet and return sections opening into said rear turnaroundpassage at locations adjacent and spaced from the opposite lateral interior walls of said housing to efiect'said' comparatively unused space at the opposite sides of said housing.
- said partition cooperating 'withsaid baffle means to define a volume containing the openings of saidinle't and return sections into said rear turnaround passage.
- said inlet and return sections ex'tending withinfsaid, housing adjacent and spaced from opposite interior lateral walls thereof respectively, said exhaust section extending within said housing between said inlet and return sections, said means'for attenuating comparatively high frequency sounds also including 1. a' second partition within said front turnaround passage defining a second tuning chamber separated from the primary flow of 'exhaust gases in said frontturna'round passage between the openings thereinto' of said return and exhaust conduit sections,'and 2. a second plurality of openings in said second partition acoustically'coupling said second tuning chamber and the'region of said-frontturnaround passage employedfor said primary flow of'exhaust gases.
- said passage comprising a front turnaround passage
- said exhaust conduit means including an inlet section extending rearwardly into said'housing through said front turnaround passage
- said pair of conduit sections including a return section means connecting said inlet and return section, the latter opening into said passage to discharge exhaust gases thereinto
- said pair of conduit sections also including'an exhaust section opening into said front turnaround passage to receive said exhaust gases therefrom and extending rearwardly through said housing.
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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)
Abstract
Description
Claims (9)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US88683969A | 1969-12-22 | 1969-12-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3557904A true US3557904A (en) | 1971-01-26 |
Family
ID=25389891
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US886839A Expired - Lifetime US3557904A (en) | 1969-12-22 | 1969-12-22 | Automobile exhaust muffler |
Country Status (1)
Country | Link |
---|---|
US (1) | US3557904A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4342373A (en) * | 1981-03-17 | 1982-08-03 | Tenneco Inc. | Muffler with three part welded joint |
US20050252713A1 (en) * | 2004-05-17 | 2005-11-17 | Calsonic Kansei Corporation | Shell main body for muffler |
US7364013B2 (en) * | 2004-08-25 | 2008-04-29 | Calsonic Kansei Corporation | Shell main body for muffler |
US20110083924A1 (en) * | 2009-10-08 | 2011-04-14 | Park Kichul | Muffler for vehicle |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2109220A (en) * | 1936-04-11 | 1938-02-22 | Noblitt Sparks Ind Inc | Muffler |
US2182945A (en) * | 1937-07-30 | 1939-12-12 | Walker Mfg Co | Exhaust silencer |
-
1969
- 1969-12-22 US US886839A patent/US3557904A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2109220A (en) * | 1936-04-11 | 1938-02-22 | Noblitt Sparks Ind Inc | Muffler |
US2182945A (en) * | 1937-07-30 | 1939-12-12 | Walker Mfg Co | Exhaust silencer |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4342373A (en) * | 1981-03-17 | 1982-08-03 | Tenneco Inc. | Muffler with three part welded joint |
US20050252713A1 (en) * | 2004-05-17 | 2005-11-17 | Calsonic Kansei Corporation | Shell main body for muffler |
US7293628B2 (en) * | 2004-05-17 | 2007-11-13 | Calsonic Kansei Corporation | Shell main body for muffler |
US7364013B2 (en) * | 2004-08-25 | 2008-04-29 | Calsonic Kansei Corporation | Shell main body for muffler |
US20110083924A1 (en) * | 2009-10-08 | 2011-04-14 | Park Kichul | Muffler for vehicle |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: FIDELITY UNION TRUST COMPANY, TRUSTEE,NEW JERSEY Free format text: MORTGAGE;ASSIGNOR:CHRYSLER CORPORATION;REEL/FRAME:003832/0358 Effective date: 19810209 Owner name: FIDELITY UNION TRUST COMPANY, 765 BROAD ST., NEWAR Free format text: MORTGAGE;ASSIGNOR:CHRYSLER CORPORATION;REEL/FRAME:003832/0358 Effective date: 19810209 |
|
AS | Assignment |
Owner name: CHRYSLER CORPORATION, HIGHLAND PARK, MI 12000 LYNN Free format text: ASSIGNORS HEREBY REASSIGN, TRANSFER AND RELINQUISH THEIR ENTIRE INTEREST UNDER SAID INVENTIONS AND RELEASE THEIR SECURITY INTEREST.;ASSIGNORS:FIDELITY UNION BANK;ARNEBECK, WILLIAM, INDIVIDUAL TRUSTEE;REEL/FRAME:004063/0604 Effective date: 19820217 |
|
AS | Assignment |
Owner name: CHRYSLER CORPORATION Free format text: PARTES REASSIGN, TRANSFER AND RELINQUISH THEIR ENTIRE INTEREST UNDER SAID PATENTS ALSO RELEASE THEIR SECURITY INTEREST.;ASSIGNOR:MANUFACTURERS NATIONAL BANK OF DETROIL (CORPORATE TRUSTEE) AND BLACK DONALD E., (INDIVIDUAL TRUSTEE);REEL/FRAME:004355/0154 Effective date: 19840905 |