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Publication numberUS2099858 A
Publication typeGrant
Publication dateNov 23, 1937
Filing dateDec 8, 1934
Priority dateDec 8, 1934
Publication numberUS 2099858 A, US 2099858A, US-A-2099858, US2099858 A, US2099858A
InventorsLucien L Haas, Roy J Mackenzie
Original AssigneeBuffalo Pressed Steel Company
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Muffler construction
US 2099858 A
Abstract  available in
Images(2)
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Claims  available in
Description  (OCR text may contain errors)

Nov. 23, 1937.- R. J. MMKENZIE ET AL 2,099,858

MUFFLER cous'raucnou Filed Dec. 8, 1934 2 Sheets-Sheet 1 Nov. 23, 1937.

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R. J. M KENZIE ET AL. 2,099,858

MUFFLER CONSTRUCTION Filed Dec. 8, 1934 2 Sheets-Sheet 2 INVENTO/PJT 4 kg yz V/d ml r J ATTOR/Vf Y5.

Patented Nov. 23, 1937 PATENT OFFICE MUFFLER CONSTRUCTION Roy J. MacKenzie and Lucien L Haas, Buffalo,

N. Y., assignors to Buflaio Pressed Steel Company, Buffalo, N. Y.

Application December 8, 1934, Serial No. 756,638 14 Claims. (c1.'1a1\-4s) This invention relates to improvements in mufflers or silencers of the kind which may be used for silencing noises resulting from the flow of gases, such, for example, as occur at the exhaust or intake of an internal combustion en-- gine.

It has been found in muiilers of this kind that certain sounds or noises can best be eliminated by connecting two chambers by means of a sound conducting passage or tuning tube of materially smaller cross sectional area than that of the chambers and materially greater length than its.

diameter. In constructionsheretofore used, these tuning tubes were generally made of tubing welded to a name connect ng two adjacent chambers, and this construction consequently involved considerable expense.

The objects of this invention are to provide mufflers with sound conducting passages or tuning tubes of improved and inexpensive construction; also to provide a muiller with passages or tubes made entirely of sheet metal and secured to the muffler by inexpensive means; also to improve the construction of muiilers by providing r; the same with sound conducting passages which are formed by two adjacent portions of the muftier; also to improve the construction of mufflers in other respects hereinafter specified.

The improvements herein described may be applied to mutilers of any suitable or desired construction having more than one sound deadening or silencing chamber, and the portions of the muiiiers shown in the accompanying drawings are for purposes only of illustrating the application of the sound conducting passages or tubes of this invention to mufliers, and it is understood that the invention is not limited to the particular muiiler constructions shown.

In the accompanying drawings:

Fig. 1 is a fragmentary longitudinal central sectional view of a muiller provided with sound conducting passages embodying this invention.

Figs. 2 and 3 are transverse sectional views thereof respectively on lines 2-4 and 8-4,

Fig. 1.

' Fig. e is a fragmentary longitudinal central sectional view of a muffler showing sound conducting passages of another construction.

Fig. 5 is a fragmentary transverse sectional elevation thereof, on line 55, Fig. 4.

Fig. 6 is a fragmentary longitudinal central sectional view of the mufiler provided with sound conducting passages of still another construction. Fig. 7 is a transverse sectional view thereof, on line 1-1, Fig. 6.

Fig. 8 is a fragmentary longitudinal central sectional view of still another-modified construction.

Fig. 9 is a transverse sectional view thereof, on line 9-8, Fig. 8. i

Fig. 10 is a fragmentary longitudinal central sectional view of a mufller showing still another form of sound conducting passage.

Fig. 11 is a transverse sectional view thereof on line "-1 i, Fig. 10.

Referring to Figs. 1 to 3, i5 represents the outer shell and IS the inner shell of a muiller, and ll 9. head at one end of the muffler. An intermediate shell I8 is arranged between the inner and outer shells and has its end provided 15 with inwardly pressed or contracted portions 19 contacting with the inner shell i6; Other portions of the intermediate shell are bowed outwardly as indicated at 20, to form channels between the inner and intermediate shells through 20 which sound waves or gas impulses may pass from a chamber 2| formed between the inner and intermediate shells. 22 represents a baiile, which is spaced between the outer and intermediate shells and separates the space between thesetwo 25 shells into resonance chambers 24 and 25.

In the embodiment of the invention illustrated in Figs. 1 and 2, sound conducting passages or tuning tubes are provided to connect the chainbers 24 and 28, and for this purpose, the inter- 30 mediate shell is provided with one or more inwardly pressed longitudinally extending grooves or channels 26, two of these channels being shown in the construction illustrated. A tubular member or sleeve 21 is arranged around the por- 5 tion of the intermediate shell which is provided with the channels or grooves 26. It will be noted that the grooves or channels are of greater length than the sleeve 21, so that the ends of the channels may terminate in openings in the 40 chambers 24 and 25 beyond the ends of the sleeve. The sleeve contacts through the greater portion of its inner surface with the intermediate shell IO and other portions of this sleeve close the outer or open sides of the channels 26, thus 45 forming sound conducting passages or tuning tubes through which sound waves or impulses may travel from one of the connecting chambers to the other. The length of the passages or tubes can, of'course, be easily varied by changing the length of the channels 26 and sleeve 21.

In the particular construction illustrated in Figs. 4 and 5, it is desired to connect two chambers Ill and 3| by means of one or more tuning tubes or sound conducting passages, the cham- 55 bore 8% and ilibeing formed between the outer and intermediate shells 3'2 and 33. In this case, grooves or channels tit are formed in the intermediate shell 33, and the open sides of these grooves or channels are closed by a tubular member or sleeve which, in the particular construction illustrated, is in the form of an annular flange formed integral with the baffle member 33.

In the construction illustrated in Figs. 6 and 7, two chambers it and ill arranged between two shells t2 and lit are connected by means of sound conducting passages or tuning tubes formed by providing the transverse bailie member M with an elongated inner flange, forming a tubular member or sleeve l5 and which is provided with outwardly projecting beads or channels 35, which extend lengthwise of the sleeve and form with the shell d3 sound conducting passages or tubes connecting the chambers fill and ii.

In Figs. 8 and 9 is shown a construction, quite similar to that illustrated in Figs. 1 to 3 inclusive, except that in Figs. 8 and 9, the sound conducting passages are formed by providing channels 50 in a sleeve iii, instead of in the intermediate shell. The intermediate shell 52 closes the inner open faces of the channels, so that sound conducting-passages are formed connecting the chambers and 5d at opposite sides of the baiiie 55.

It will be noted in all of these constructions that to provide these sound conducting passages or tuning tubes, it is merely necessary to supply the muiiier with one additional tubular member, namely, a sleeve which may be either a portion of the transverse baffle or formed separately therefrom, and this sleeve may cooperate with a shell of the mufiler to form with the shell sound conducting passages between the two chambers. The shell and sleeve may be readily fastened together by welding or in any other convenient manner, and the provision oi separate pieces of tubing and the welding of the same to a baffle are entirely eliminated, together with the expense which this prior construction involved.

. We claim as our invention:

1. A muiiier including inner, outer and inter mediate shells, a head connecting the outer and inner shell, said intermediate shell terminating at a distance from said head, a baffle dividing said intermediate and outer shells into separate sound deadening chambers, said inner shell forming a through passage for gases and sound waves and having perforations in portions thereof surrounded by said intermediate shell, said end of said intermediate shell having portions thereof pressed inwardly into contact with said inner shell and other longitudinal portions spaced from said inner shell to form a restricted passage connecting the space between said inner and intermediate shells with one of said chambers, and a tuning passage of much greater length than width connecting said chambers and terminating at opposite sides of said bafile, a portion of the wall of said passage being formed by one of the shells connected with said baiile.

2. A muflier having a main passage therethrough for gases and sound waves, and shells extending about said main passage, and arranged one within another, a bafile extending across the space between adjacent shells to form aresonance chamber about said main passage and into which sound wavesfrom said main passage may pass, and a sleeve snugly fitting one of said shells and contacting therewith throughout a substantial part of a surface of said sleeve and spaced from said shell at a longitudinal portion thereof to aoeaess form a channel, one end of which terminates in said resonance chamber and the other end of which receives sound waves from said passage, the length and cross sectional area of said channel being predetermined to cooperate with said resonance chamber to reduce certain sounds in said passage by destructive interference, one of said baiiies forming a wall of said resonance chamberand also connecting with said sleeve.-

3. A muffler having a. main passage therethrough for gases and sound waves, shells extending about said main passage, and arranged one withinanother, a. bafile extending across the space between adjacent shells to form a resonance chamber about said main passage and into which sound waves from said main passage may pass,

. and a sleeve interposed between the inner periphcry of one of said bafiies and one of said shells and fitting snugly about and contacting with said shell throughout a substantial part of the inner surface of said sleeve and spaced from said shell at a longitudinal portion thereof to form a channel which terminates at one end in said resonance chamber at one side of said baflle and at its other end at the opposite side of said bafile, the other end of said channel being open to receive sound waves from said passage, the length and cross sectional area of said channel being predetermined with relation to said resonance chamber to form a bottle neck resonance chamber tuned to certain sounds occurring in said passage.

4. A muflier having a main passage therethrough for gases and sound waves, shells extending about said main passage, and arranged one within another, a baffle extending across the space between adjacent shells to form a resonance chamber about said mainpassage and into which sound waves from said main passage may pass, and a sleeve at the inner periphery of one of said bafiles and fitting snugly about one of said shells and cbntacting therewith throughout the greater part of the inner surface of said sleeve, said shell being provided with a longitudinally extending depression, the opposite ends of which extend beyond the ends of said sleeve to form a channel, one end of which terminates in said resonance chamber at one side of said bafiie and the other end of which terminates at the other side of said bafiie in a position to receive sound. waves from said passage, said channel being of a length and cross section to cooperate with said resonance chamber to form a bottle neck resonator tuned with respect to certain sound waves occurring in said passage.

5. A mufiier having a main passage therethrough for gases and sound waves, shells extending about said main passage, and arranged one within another, a ballie extending across the space between adjacent shells to form a resonance chamber about said main passage and into which sound waves from said main passage may pass, and a sleeve arranged at the inner periphery of one of said baiiies and. snugly fitting about one of said shells and contacting therewith throughout asubstantial part of the inner surface of said sleeve, said sleeve being provided with portions formed to extend away from the surface of shell to form a channel, one end of which termi nates at one side of said baflie insaid resonance chamber, and the other end which terminates at the other side of said baffie in a position to receive sound Waves from said passage, the cross sectional area and length of said channel being so proportioned with reference to said resonance chamber as to silence certain sounds in said passage by destructive interference.

6. A muiiler having a main passage therethrough for gases and sound waves, shells extending about said main passage, and arranged one within another, a baille extending across the space between adjacent shells to form a resonance chamber about said main passage and into which sound waves from said main passage may pass, and a sleeve telescopically arranged within one of said battles and fitting snugly about one of said shells and contacting therewith throughout a substantial part of the inner surface of said sleeve and spaced from said shell at a longitudinal portion thereof to form a channel which terminates beyond the ends of said sleeve, one end of said channel terminating in said resonance chamber at one side of said baffle and the other end of which terminates at the other side of said baflle in a position to receive sound waves from said passage, said channel forming a neck for said resonator chamber, and the length and cross sectional area of said channel being so formed with relation to said resonance chamber as to deaden certain sound waves in said passage by destructive interference.

7. A mufiier having a main passage therethrough for gases and sound waves, shells extending about said main passage, and arranged one within another, a baflle extending across the space between adjacent shells to form a resonance chamber about said main passage and into which sound waves from said main passage may pass, one of said bailles being provided with an integrally formed tubular extension fitting snugly about one of said shells and contacting therewith throughout a substantial part of the inner surface of said tubular extension and spaced from said shell at longitudinal portions thereof to form a channel, one end of which terminates in said resonance chamber, and the other end of which receives sound waves from said passage; the

length and cross sectional area of said channel being predetermined to cooperate with said resonance chamber to reduce certain sounds in said passage by destructive interference, said baffle also forming a wall of said resonance chamber.

8. A muilier having nested inner, intermediate and outer shells, said inner shell forming a substantially straight uninterrupted passage from end to end thereof and being apertured in a portion thereof surrounded by said intermediate shell, said intermediate shell terminating at one end at a distance from the adjacent end of the inner shell and having longitudinal portions of its end pressed inwardly into contact with said inner shell and having another portion between said inwardly pressed portions spaced from said inner shell to form a channel terminating at one end in a space between said intermediate shell and an apertured part of said inner shell and at its other end in a space between said inner and outer shells extending beyond the end of said intermediate shell, a sleeve surrounding a portion of said intermediate shell at a distance from the end thereof and contacting throughout a substantial portion thereof with an intermediate shell, another portion of said intermediate shell and said sleeve being spaced apart to form a channel terminating at opposite ends of said sleeve, a transverse annular baflle, the inner periphery of which terminates at said sleeve, said channel connecting at one end with a resonance chamber, one wall of which is formed by said balls, and

at its other end in said chamber between said inner and outer shells.

9. In a muiller of the type which silences sound waves by a destructive interference, the combination of a pair oi shells arranged one within the other, a sleeve arranged in the space between said two shells snugly fitting one of said shells and having the greater part of one surface thereof in contact with said shell, and a baiile extending from said sleeve to the other of said shells,

said sleeve and said first mentioned shell being spaced apart at portions thereof to form between them a'.channel extending from end to end of said sleeve and communicating at one end with said resonance chamber and at the other end with said main passage.

10. In a muifler, the combination of a pair of shells secured one within another, a battle forming a connection between said shells and dividing the space between said shells into separate chambers, means for admitting sound waves to-one of said chambers, a sleeve having portions thereof contacting with one of said shells and having other portions thereof spaced from said shell from end to end of said sleeve and terminating at opposite sides of said baflle to form tuning tubes connecting said chambers.

11. In a muiller, the combination of a plurality of longitudinally extending tubular members secured one within another, a transverse baflle forming a connection between two adjacent tubular members and dividing the space between said members into separate chambers, a short tubular member arranged with a substantial portion thereof in contact with one of said first mentioned tubular members, at least one of said two last mentioned tubular members being provided with a longitudinal channel formed therein and of greater length than said short tubular member to form between said last mentioned tubular members a tuning passage connecting said chambers, said transverse baille being arranged with its inner periphery terminating at said sleeve.

12. In a muiiler, the combination of a pair of shells secured one within another, a baiile forming a connection between said shells and dividing the space between said shells into separate chambers, means for admitting sound waves to one of said chambers, a sleeve having portions thereof contacting with one of said shells, said sleeve having a channel formed therein extending from endto end of said sleeve and forming with said last mentioned shell a sound conducting passage connecting said chambers, and means connecting said sleeve with another shell located adjacent thereto to force sound waves to pass through said channel.

13. In a mumer, the combination of a pair of shells secured one within another, a baiiie forming a connection between said shells and dividing the space between said shells into separate chambers, means for admitting sound waves to ing a connection between said shells and dividing E memos the space between said shells into separate chamnesting chambers at opposite sides of said baffle, hers, means for admitting sound} waves to one of and means connecting said sleeve with another said chem'oees, a. sleeve having portions thereof shell located adjacent thereto to force sound contacting with one of said shells and having a Waves to pass through said channel.

5 longitudinal channel formed therein and extencling throughout the length thereof and forming BUY J. mwmmmwith said shells a sound conducting passage con- LU GEEEI L. HALAS.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3104733 *Nov 7, 1960Sep 24, 1963 Ludlow
US3104734 *Nov 7, 1960Sep 24, 1963 Sound attenuating gas pipe
US3104735 *Nov 14, 1960Sep 24, 1963Arvin Ind IncSound attenuating gas pipe
US3110358 *Jul 10, 1961Nov 12, 1963Arvin Ind IncSound attenuating gas conduit
US3118517 *Jul 17, 1961Jan 21, 1964Arvin Ind IncSound attenuating gas conduit
US3128841 *Aug 17, 1961Apr 14, 1964 Sound attenuating gas conduit and resonators therefor
US3146850 *Sep 18, 1961Sep 1, 1964Arvin Ind IncSound attenuating gas conduit
US3196976 *Jun 27, 1963Jul 27, 1965Walker Mfg CoMuffler having outer shell deformed to define chambers around center tube
US3209858 *Jun 25, 1963Oct 5, 1965Walker Mfg CoMuffler having depressed channel forming tuning passages
US5350888 *Dec 16, 1993Sep 27, 1994Tennessee Gas Pipeline CompanyBroad band low frequency passive muffler
US5365025 *Aug 20, 1993Nov 15, 1994Tennessee Gas Pipeline CompanyLow backpressure straight-through reactive and dissipative muffler
US8756812 *May 21, 2010Jun 24, 2014James E. WhiteAir cooled heat shield
Classifications
U.S. Classification181/250
International ClassificationF01N1/00, F01N1/02, F01N13/18
Cooperative ClassificationF01N2490/20, F01N1/02, F01N1/006, F01N2490/155, F01N2470/02, F01N13/18, F01N2470/24, F01N1/023, F01N2490/15
European ClassificationF01N1/02B, F01N1/00B1, F01N1/02, F01N13/18