US2484521A - Baffle type muffler with retroverted flow - Google Patents

Description

P. J. MAY

BAFFLE TYPE MUFFLER WITH RETROVERTED FLOW Oct. 11, 1949.

2 Sheets-Sheet 1 Filed Dec. 8, 1945 Ezra-.1

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P. J. MAY

BAFFLE TYPE MUFFLER WITH RETROVERTED FLOW Oct. 11, 1949.

w 1 M v I J w 2 I w a w m PM .2 1d I M m lmrlm m w wwwww 0 DO 0 O O O HHM Jm M mm m m ww \N m M o WWW w Patented Oct. 11, 1949 STATES PATENT OFFIE BAFFLE TYPE MUFFLER WITH RETROVERTED-1FLOW Patrick J. May, San Francisco, Calif. Application December 8, 1945, Serial No. 633,760

(CL ISL-53) 3 Claims.

-My invention relates to improvements in internal combustion engine mufflers, and more particularly to a two-piece muflier housing comprising upper and lower sections in which are positioned a series of perforated baffle plates and deflector plates, together with a pair of baffles at-the'rear end of the muffler which traps any exhaust noises and simultaneously directs the exhaust gasses towards the: front of the muffler and finally-over a rearwardly extending solid baffle to the exhaust end of the muffler.

'An" object of my invention is to provide an improved form of muffler which will be substantially rectangular in cross section and which will comprise a plurality of perforated baffles and a baffle trap, whereby the exhaust noises incident toan internal combustion engine will be. silenced, and at the same time the construction of the muffler will prevent any trapping or pockets of the exhaust gasses in the muflier, thereby enhancing the eflicient operation of the internal combustion engine to" which it is attached.

A further object of my invention is to provide a highly efficient form of muffler for an internal combustionengine which will reduce back pressure and pocketing of the exhaust gasses to a minimum, while muffiing and silencing the exhaust noises from the internal combustion-engine to which the muffler is attached.

Other objects will appear as proceeds.

In the accompanying part of my application,

Figure I is a top plan view of my improved muffler;

Figure, mufller;

Figure 3 is an end view of my muffler;

"Figure 4' is a longitudinal sectional view through the muffier;

Figure 5 is a transverse sectional view taken on the line 5-5' of Figure 4;

Figure 6' is a transverse sectional view taken on the line 6-6 of Figure 4;

Figure. '7 is a partial sectional view taken on the line 1-4 of. Figure 4 and Figure :8 is a sectional view taken on the line 8---,8 of- Figure 4.

Like characters of reference are used throughout; the. following specification: and the accom-e drawings to designate corresponding mintsm carrying out my inventionl provide a muffler heusing'having anupper section i and alower drawings which form. a

2' is a side elevation of my improved the description section 2 substantially rectangular in shape and held together by means of the beads 3 on the opposite sides of the upper section and the flanges 4 on the opposite sides of the lower section, which are crimped together to form a substantially rigid muffler housing. Theopposite ends of the muffler housing are tapered as at 5 and 6 and terminate in the cylindrical ends I and 8, which will be connected respectively to the exhaust manifold of an internal combustion engine (not shown), and to the exhaust tail pipe (also not shown).

At the inlet end of the muffler housing and secured to the inner surfaces of the upper and lower sections by spot welding 9, I have provided the rearwardly extending converging perforated baffles I0 and H which are slightly bowed transversely and extend the full Width of the muffler housing at that point. These baflles l0 and II are bent adjacent their rear ends to form the flattened parallel extending terminal ends 12 and I3 and are slightly spaced to direct the exhaust gasses rearwardly along the interior of the muffier.

A second pair of perforated baffle plates l4 and 15 extend transversely of the muffler sections I and 2, and are suitably secured thereto and converge or slope toward each other from the front end of the muffler toward the rear thereof, and terminate in the spaced parallel extending terminal ends 16 and I1, which are in alignment with the terminal ends [2 and l3 of the baffle plates I0 and II, but to the rear thereof.

A transversely extending deflector plate I8 is spot welded at H! to the opposite sides of the upper muffler section I, and is formed with the perforations 20 adjacent its forward end and the perforations 2'! adjacent its rear end. The plate 18 slopes downwardly from its front end to its rear end and is bent upwardly as at 22 adjacent its rear end. The purpose of the deflector plate I8nis to prevent trapping or pocketing of the exhaust gasses in the front end of the muffler, particularly between the baffle plate 14 and the deflector plate l8.

A forwardly sloping deflector plate 23 extends transversely of the muffler housing from a .point a short distance below the top of the upper muffler section I where it is spot welded at 24, to the bottom of the lower mufiier section 2, thereby acting to direct all of the exhaust gasses rearwardly and to discharge the said gasses through the restricted opening formed by the upper rear end of the deflector plate 23 and the adjacent top of the top muffler section I.

A short forwardly sloping deflector plate 25 extends transversely across the muffler housing for the exhaust sounds and stops the acoustics between the said plates 2'! and 28. The plate 21 is spot welded at 29 to the top of the mufiler housing and extends downwardly therefrom and is bent at right angles thereto, and extends forwardly to a point intermediate the deflector plates 23 and 25, where it is again bent to extend parallel with and between the said plates 23 and 25.

The plate 21 is also spot welded at 30 and 3| to the sides of the muffler housing, shown in Figure 4 of the drawings.

The baffle .or deflector plate 28 is spot welded at 32 to the top of the muffler housing and extends downwardly therefrom and is bent at right angles to extend forwardly to a point between the deflector plates 23 and 21. Perforations 33 are formed through the upper portion of the plate 28 so that the remaining exhaust noises will be cushioned as they pass through these perforations, and the noises will be stopped or trapped between the plates 28 and 29. The flow of exhaust gasses will then be directed forwardly between the deflector plates 23 and 29, and then rearwardly between the plates 25 and 29, where the gasses will pass out of the muffler to and through the tail pipe (not shown).

From the foregoing description it will be apparent that I have devised a highly eficient form of muffler which will efiiciently silence the noises from an internal combustion motor, and will reduce pocketing or back pressure .of the exhaust gasses to a minimum. By inspection of Figure 4 of the drawings it will be apparent that the exhaust gasses enter the front end 7 of the muffler and pass through the perforations in the bafile plates Ill and through the restricted opening between the transverse parallel tail ends l2 and I3 of the baffles f and l I. It will be understood that some of the gasses pass through the perforations and some of the gasses pass between the tail ends [2 and l 3. The gasses will then be deflected rearwardly where they will pass through the perforated deflector plates or baffles 14 and I5, and also some of the gasses will pass through the restricted opening between the parallel transverse tail ends l6 and ll of the said baffles l4 and IS.

The exhaust gasses will then be directed to and through the deflector plate I8 and along the upper surface of the deflector plate 23 and from this point through the restricted opening at the rear end of said deflector plate 23 and the top of the muffler housing. The deflector plate l8 with its arrangements of perforations 2a and 2| serves to prevent any pocketing or trapping of the exhaust gasses at this forward end of the muffler and the upturned tail end 22 of the deflector plate f8 will direct the exhaust gasses toward the restricted openings formed by the deflector plate 23 at the top of the muffler housing as hereinbefore described.

The flow of exhaust gasses will pass through the perforations 33 in the plate or baffle 28 and into the space between the said plate or baffle 23 and the baffle 27, whereupon the gasses will be as clearly exhaust gasses to said directed forwardly and down between the forward portion of the baffle 21 and the deflector plate 23. From this point the gasses will then be directed rearwardly between the baflles or deflector plates 25 and 2'! to the rear end of the muffler where they will pass from the muffler and to and through the tail pipe (not shown). As hereinbefore described and mentioned the formation ,of the deflector of baffle plates 28 and 29 with the perforation 33 in the plate 28 serves to cushion and stop the exhaust sounds so that practically no noise will be emitted from the rear end of the muffler. It has been found that internal combustion engines equipped with mufflers formed in accordance with my invention, are highly efficient, and due to the fact that there is substantially no back pressure in the muffler, I have been able to run more miles per gallon of gasoline when using this mufller than possible when using mufflers now on the market.

While I have described and illustrated my preferred form of invention, it will be understood that I do not intend to limit myself to this specific construction, as many minor changes in detail of construction may be resorted to without departure from the spirit of the invention.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. An engine muffler comprising a housing having upper and lower sections connected along their opposite sides, a tortuous path of travel for exhaust gases defined in said housing and including nested pairs of rearwardly converging perforated baffle plates positioned adjacent the front ends of said muffler and terminating in restricted longitudinally aligned end inlet passages, a pair of cooperating angular deflector baffle plates positioned adjacent the rear of said muffler, one of said last mentioned plates being perforated, a rearwardly sloping perforated deflector plate positioned adjacent said front baffle plates and having an upwardly angularly extended terminal end disposed adjacent the inlet passageways for directing the I rear baffle plates, an elongated upwardly sloping imperforate deflector plate extending rearwardly from the bottom of the mufller housing to a point adjacent the rear ballie plates, said deflector plate being spaced from the top of the muffler housing thereby forming a restricted opening through which exhaust gasses will be directed toward the rear baffle plate, said angular terminal and elongated plate defining a selected rearwardly extending passageway and an upwardly sloping short deflector plate extending between the sides of the muffler hous-' ing from the bottom of the muffler housing to a point below the rear baffle plate, said short deflector plate being parallel to said elongated deflector plate and lying below the same forming a restricted outlet passage.

2. An engine muffler comprising a housing having upper and lower sections connected along their opposite sides, a tortuous path of travel for exhaust gases defined in said housing and including a plurality of nested rearwardly converging perforated baffle plates positioned adjacent the front end of said housing and terminating in restricted longitudinally aligned inlet passageways, a pair of cooperating angular deflector baffle plates positioned adjacent the rear end of said housing at the top thereof, one of said last named baffle plates being perforated, a rearwardly sloping deflector plate positioned intermediate said front and rear baffle plates and having an,

upwardly extending terminal end spaced from said housing and disposed adjacent the inlet passageways to direct the exhaust gases toward said rear baffle plates, an elongated upwardly sloping deflector plate extending rearwardly from the bottom of the housing to a point adjacent the rear bailie plates and spaced from the top of the housing to define a restricted passageway at the top of the housing to the rear baffle plates and an upwardly sloping short deflector plate positioned parallel to and below the elongated deflector plate.

3. An engine muffler comprising a housing having opposed ends provided with longitudinally aligned openings defining an inlet and an outlet, nested pairs of rearwardly converging perforated baffle plates positioned adjacent the inlet end of the housing and terminating in restricted longitudinally aligned inlet passageways, a pair of cooperating angular inner and outer deflector bafiie plates positioned adjacent the outlet end of the housing, said inner plate being perforated, a rearwardly and downwardly sloping perforated deflector plate positioned in front of said nested inlet baiile plates and having an upwardly extended terminal end disposed adjacent the inlet passageways in the plates, said terminal end being adapted to direct the exhaust gases to said outlet baiiie plates, an elongated upwardly sloping deflector plate positioned below the nested inlet bafiie plates and extending rearwardly from the bottom of the housing to a point spaced from the top adjacent the outlet baiiie 6 plates to define a restricted opening through which the exhaust gases will be directed towards the outlet bafile plates, said terminal end and elongated baffle plate being disposed in substantial parallelism and defining a restricted passageway, an upwardly sloping short deflector plate extending between the sides of the housing from the bottom thereof to a point below the outlet baiile plates, said short deflector plate being parallel to said elongated plate and positioned below the same, and said outer outlet baffle plate being provided with an angular downwardly extending end directed between the short deflector plate and elongated deflector plate.

PATRICK J. MAY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 980,064 Carrick Dec. 27, 1910 1,169,030 Hardy Jan. 18, 1916 1,182,611 Williams and Weaver May 9, 1916 1,452,435 Pullin Apr. 17, 1928 1,474,115 Heather Nov. 13, 1923 1,685,701 Blanchard Sept. 25, 1928 1,688,488 Dormeyer Oct. 23, 1928 2,010,175 Boysen Aug. 6, 1935 2,122,086 Chase June 28, 1938

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