US3166151A - Muffler - Google Patents

Description

Jan, 19, 1965 w. H. POWERS 3,166,151

MUFFLER Original Filed Sept. 18. 1957 2 Sheets-Sheet 1 X INVENTOR.

Jan. 19, 1965 w. H. POWERS 3,166,151

MUFFLER Original Filed Sept. 18'. 195'? 2 Sheets-Sheet 2 5 INVENTOR United States Patent O 3,166,151 MUFFLER Walter H. Powers, Racine, Wis., assigner to Walker Man-- ni'acturing Company, a corporation of Delaware Original applicaticn Sept. 18, 1957, Ser. No. 684,792, now Patent No. 3,035,654, dated May 29, 1962. Divided and this appiication July 28, 1961, Ser. No. 127,581 1 Claim. (Cl. 181-54) size of the muliier unit so that it can be more readily placed in modern automobiles where space is at a premium.

The invention is illustrated in preferred forms in the accompanying drawings in .whichz FIGURE 1 is a longitudinal cross section through a muffler embodying the invention;

iFlG. 2 is a section taken along the line 2-2 of FIG. 1;

FIG. 3 `is a side elevation taken from the right of `FIG. l;

lFICi. 4 is `a longitudinal cross section of another muftler embodying the invention;

fFIG. 5 is a cross section taken along the line 5 5 of FIG. 4; and

FIG. 6 is a side elevation taken from the right of FIG. 4.

As seen in FlGS. 1 3, the rnuier 11 comprises an inner shell 101 which is lockseamed at :103 and around which is wrapped a layer of asbestos and then an router cover 107 which is Ilockseamed at 109. The ends `of the shell 101 are closed by an outwardly bulged inlet header 111 and an outwardly dished Ioutlet header 113 which are each interlocked with the ends of the inner casing 101.

The space within the shell 101 is divided into chambers 1-15, i117, and .119 (which preferably occupies more than half the volume of the shell) Iby the two partitions 121 and 123 each of which has circumferential anges extending toward the 'forward or inlet end head that are spot ywelded to the shell 101. An inlet bushing 125 is expanded and spot welded to a neck `127 on the inlet header 11|1 and -it also is seated within a neck 129 of lthe partition y121 and spot welded to it, the inside end of the bushing 125 being iiared outwardly as shown at y131 to catch behind the partition 121. In alignment with the opening provided yby the inlet bushing 125 but spaced from it across the width of the chamber 1,17 is an imperyforate tuning tube 133, the outlet end of this tube emptying into the resonator chamber 1-19 close to the outlet header 113. It will be seen that gas flowing through .the tube -133 must return through it back to the chamber 117. The outlet tube 135 is supported at its inlet end by spot welds which attach it to a forwardly extending flange i137 on the partition 123. The .outlet end of the outlet pipe 135 is spot welded to an enlarged diameter portion 13-9 on the drawn outlet neck 141 formed in the outlet header 113. The outlet tube 135 has three groups of louvers 143 formed in the wall thereof and extending circumferentially around it similar to the louvers 43. These louvers empty into a series of spit chambers 145 which are separated from each other and which surround each of the groups of louvers i143. The spit chambers 145 are provided by a pancake construction which con- ICC sists of a pair of opposite stamped dished sheet metal sections which have mating flanges 149 that are spot welded together and which extend radially with respect to the axis of .the pipe. The ends of the sections are reduced so as to Atit the pipe 135 as seen at 151 andv153 and intermediate portions are also reduced so that they tit the pipe and are spot welded to it as seen at 155. A. hanger strap 157 is spot welded at 159 to the tiange 149 of the pancake construction 1147 and its other end is spot welded at 161 to the outlet end of the tuning tube i133 so as to furnish support for it and eliminate the need for a partition to [furnish such support.

The partition 121 has a pair of necked openings 163 and 1165 which communicate the chamber i117 with the chamber 115. The partition 121'will serve to eliminate head ring at the inlet end of the muffler and the small volume provided there, largely :because .of the `outwardly dished shape of the inlet header 111, will serve to attenuate certain frequencies.

The gas will enter .the muiiier =11 through the inlet bushing 125 from the pipe 9 and flow through it into the chamber :1117. This gas can ow transversely of the length of the muffler across the space 1:17 and enter the inlet end of the outlet pipe and iiow through it directly through the mufer 11 into the tail pipe (not shown). However, heavy notes and heavy slugs of gas will pass through the tuning tube 133 and enterjthe dead end chamber 119 and be attenuated there.y Additional silencing is obtained in the spit chambers and in the chamber 115.

The partitions 121 and 123 have the internal drainage openings 17 formed adjacent to the shell 1011 at the top and the bottom of the muffler, it being noted that this muier is disposed so that the major axis is vertical. The openings 1.71 should be approximately 1A in diameter. The outlet header :113 also may have a 0.12 diameter opening `on its bottom side as shown at '173, it being noted that FIG. 3 shows the -rnutiier turned upside down from the position that it would be used.

FIGS. 4-6 show a modied mutiier construction 299. The muffler I261% has an inner shell 201 which isV lockseamed at 263. It is surrounded by a layer of asbestos 205 which in turn is held in place :by a cover 207 that is lockseamed at 269. The inlet header 211 is bulged outwardly and interlocked in a reverse bend joint at 213 while the `outlet header 215 is also interlocked with the shell 201 in reversely bend bead 217.

The inlet header 211 has an outwardly extending flanged neck 214. Seated in the neck 2.14 is an inlet bushing 2416 which is expanded at opposite sides of the neck 214 and .into tight engagement with :the neck s0 that it can be spot welded to the neck. The end of the bushing 216 extends through a rearwardly .facing neck 219 formed in a transverse partition 221 that has a circumferential ange that is spot welded to the shell 2&11. Within the outlet end of the bushing 216 is mounted a tuning tube `225 and it along with the bushing 216 are spot welded to the neck 219 as seen at 227. The partition 221 forms a chamber 229 Ibetween it and the inlet header 211 which is preferably less than half the volume of the shell 2011. Gas entering the muffler through the inlet bushing 216 can enter the chamber 2129 Without resistance because of a very large and non-restrictive opening 231 which is cut in the side of the bushing 216. The tube 225 is im-perforate and extends along the length of the mutiler and terminates in an open end near the outlet header 215. Thus, gases which enter it will be dumped into a chamber 233 which is formed between the outlet header 215 and a transverse partition 235 which is provided with a circumferential dlange whereby it may be spot welded to the inside of the .shell i201. The space between the partition I235 and the partition 221 constivon the partition 221 and its outlet end is supported and spot Welded to a drawn neck or nipple 245 formed integrally with the outlet header 215. The outlet pipe 241 is provided with three sets of louvers 247 and these are surrounded by a pancake assembly formed of cornplemental halves which have radial tlanges 251 which are spot Welded together along a medial plane and which are necked down appropriately to provide sections 253 at opposite ends which are spot welded to the circumference of the ltube 241 and intermediateV necked down sections 255 which are also spot Welded to the circumference of the tube. The assembly `249 provides the spit chamber 257 which act upon sound Waves reaching it through the louvers 247 -to attentuate high frequencies in a known manner. The intermediate partition 235 is provided with a flanged opening 260 through which the pancake assembly 249 extends and upon which it is supported as can be seen in FIGS. 4 and 5.

Gas entering the muler 200 through the inlet nipple 216 can oW through the very large unrestricted opening 231 transversely across chamber 229 into the outlet pipe V241 and down its length out of the muler into the tail pipe 13. While passing along the pipe 241 high frequency sounds Will be attenuated in thethree spit chambers 257. YHeavy notes and large slugs of gas Will pass from the inlet bushing 216 directly along fthe aligned tuning tube 225 into the chamber 233 and through neck 239 into chamber 237 Where they Will be attenuated. It Will be seen that the panticular construction of the inlet v nipple 216 provides a rigid muler eliminating the need for a partition.

The partitions 221 and 235 have the drainage holes 261 formed on the top and bottom thereof adjacent the shell 201. These should be M1." in diameter to avoid plugging and to avoid affecting the acoustic charaoterisitcs of the muiiler. These holes Will permit the Water to iiow longitudinally from one chamber to another as the muler is rocked in usage thus permitting the condensate to come in contact with hot gases, be vaporized, land carried out through the outlet pipe. At the bottom of the outlet header 215 a 0.12" diameter drainage opening 263 is formed, this size being small enough so that it does not adversely atleet the acoustic characteristics of the muffler.

This application is a division of my copending application, Serial No. 684,792, tiled September 18, 1957, now Patent No. 3,036,654 issued May 29, 1962.

l I claim:

A small muiiler for use as a second silencing component in an internal combustion engine exhaust lline to silence a very low frequency and very high frequencies, said muffler comprising an elongated casing having inlet and outlet headers closing opposite ends, said casing having a transverse partition extending thereacross located close to the inlet header and dening an inlet chamber at the inlet end of the casing,v said transverse partition and said outlet header defining a large resonator chamber inside said casing which extends substantially more than half the length of the casing, a long open-ended outlet conduit extending longitudinally through the resonator chamber and having its outlet end secured in said outlet header and its inlet end secured in said transverse partition, said outlet conduit receiving all of its gas lioiw from said inlet chamber, a portion of said outlet conduit inside said resonator chamber being perforated, animperforate shell around the entire perforated portion of said outlet conduit Vin said resonator chamber to dene with said perforated portion a series of high frequency silencing chambers inside of the resonator chamber, a long open-ended imperforate tuning tube secured at its inlet end in said transverse partition and extending longitudinally through said resonator chamber and terminating near the outlet header, said tuning tube having a length more .than half that of the casing, said tuning tube receiving its rentire gas ilow from said inlet chamber and returning its entire flow to said inlet chamber, said tuning tube and resonator chamber forming a very loW frequency silencing means, and an inlet bushing in said inlet header delivering the entire exhaust gas flow to said inlet chamber.

References Cited in the le of this patent UNITED STATES PATENTS 1,603,910 Egner Oct. 19, 1926 v 1,821,688 Bourne Sept. 1, 1931 2,026,795 Oldberg Ian. 7, 1936 2,027,359 Wood et al Jan. 7, 1936 2,065,232 MacKenzie et al a 1 Dec. 22, 1936 2,160,332 Huber May 30, 1939 2,189,425 Leadbetter vFeb. 6, 1940 2,205,899 Chipley lune 25, 1940 2,297,046 Bourne Sept. 29, 1942 2,671,523 Walker Mar. 9, 1954 2,851,118 Diener et al Sept. 9, 1958 2,930,440 Fetzer et al Mar. 29, 1960 2,949,165 Morrish et al Aug. 16, 1960 2 950777 Deremer Aug. 30, 1960

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