US2975854A

US2975854A - Exhaust mufflers

Info

Publication number: US2975854A
Application number: US675685A
Authority: US
Inventors: Laurence D Bakke; Raymond A Dittmer
Original assignee: Continental Motors Corp
Current assignee: Continental Motors Corp
Priority date: 1957-08-01
Filing date: 1957-08-01
Publication date: 1961-03-21
Anticipated expiration: 1978-03-21

Description

March 2l, 1961 L. D. BAKKE ErAL EXHAUST MUFFLERS Filed Aug. l, 1957 O \O on INVENTORS LAURENCE D. BAKKE RAYMOND A.D|TTMER BY 5&4@ ATTORNE S .NGE

Y 22x55 .EXHAUST MUFFLERS f Detroit, Mieli.,` assignorst Continental Motors Corporation, Muskegon,`Mich., 'a corporation of Virginia This invention relates to exhaust mufllerslfor yinternal combustion engines and more particularly to a Simplified and effective muffler for small engines such as are used in compressors, starters, lawnmowers, and the like.

In the development of such small engines, simplicity and economical manufacture without sacrificing quality are highly important, and itwill be noted that many small engines lack mufllers entirely while many others have mufllers that are either ineffective, expensive, easily damaged, dilllcult and costly to assemble and repair, or conducive to considerable back pressure if not properly constructed. l

An object of the present invention is to improve small internal combustion engines by providing a simplified mufller having a minimum number of parts.

^ Another object of the invention is to improve small engine mufller construction by providing a mufller casing directly attachable to the cylinder head without the use of adapters or extraneous parts.

A Ifurther object of the invention is to further muffler manufacture by constructing a rn'ufller` having readily stamped parts and arranged for simple and rapid' assembly to the engine.

A still further object of the invention is to improve muffler construction by providing simplified parts assembled in such a manner as to give greatest structural strength.

For a more complete understanding of the invention, reference maybe had to the laccompanying drawing illustrating a preferred embodiment of the invention in which like reference characters refer to like parts throughout the several views and in which Fig. 1 is a front elevational view of the mulller assembly constructed in accordance withthe invention.

Fig. v2 is an end elevational view of the mufller and a fragmentaiyportion of the cylinder head, and

Fig. 3 is a cross-sectional view taken substantially on the line -3-3 o-f Fig. ,1.

An internal combustion engine cylinder head is illustrated as having conventional air cooling fins 11 and an exhaust port opening 12. A muffler structure 13 is secured to the cylinder head 10 by bolts 14 or similar attaching means, and comprises a casing assembly preferably constructed of an inner plate member 15 and an outer body member 16, preferably secured together by means of a crimped edge 17 and defining an elongated mufller chamber 13a therebetween, as shown in Fig. 3.

The inner plate member 15 has an extruded pocket portionv 18, in the approximate center of which is provided an inlet opening 19 arranged to register with the cylinder head exhaust port opening l12, as illustrated in Fig. 3. Also in Figs. 2 and 3 will be seen how the provision of the extruded pocket portion 18 permits the remainder of the inner plate 15 to clear the cylinder head fins 11'which are adjacent the exhaust port opening 12, thus eliminating the need for a special adapter between the mufller and the cylinder head.

v The muffler body member 16 is provided with an exi vUnited States Patent() 2 haust outlet opening preferably in the form of louvered slots 25 disposed in the outer face of the body member "16 and laterally offset from the inner plate inlet port 19.

A tubular element 26, preferably cylindrical in shape and provided with perforations 26a is seated in the pocket r18 and encloses a portion of the chamber 13a immedi- .ately' Vadjacent the inlet opening 19. The baille element 26, preferably is substantially concentric with the center of the inletopening 19, and extending to the outer face supportfor thegbody member 16. 'f

of'theibody member 16v it lservesias, a spacer, providing The bolts f14fextend'through the-outer face-of the body member 16 and the pocket 18 into the cylinder head 10 adjacent the exhaust port openinglZ, and are thus preferably enclosed by the baille element 26. The baille element 26 is spaced from'the peripheral side of the body member 16 to permit unrestricted flow of exhaust gases into the chamber 13a. Exhaust ilow thus is from the exhaust port opening 12 into the interior of said baffle element 26, through the perforations 26a into the mufller chamber `13a and out the openings 25.

Although We have described but one preferred embodiment of the invention, it will be apparent to one skilled in the art to which the invention pertains that various changes and modifications may be made therein without departing from the spirit of the invention or the scope of the appended claims.

We claim:

l. An exhaust mufller for an internal combustion engine having a finned cylinder head provided with an exhaust port, said mufller comprising substantially oval shaped inner and outer walls and a peripheral side wall defining a substantially lflattened laterally elongated chamber, one end of said inner wall having an inlet opening communicating with said exhaust port, said outer wall having an outlet opening disposed opposite the other end of said inner wall and thereby being laterally offset from said inlet opening, a tubular baille member longitudinally sandwiched between said inner and outer walls and peripherally enclosing only a portion of said chamber directly adjacent said inlet opening, said baille member comprising a tubular structure having inner and outer ends respectively abutting the inner and outer walls of said muffler whereby said baflle member is retained by and between said walls, and means securing said mufller to said cylinder head, said mulller extending laterally with respect to said exhaust port.

2. The mulller as defined in claim l and in which said inner Wall comprises a substantially flat oval face plate having an axially outwardly extruded pocket in the end having said inlet opening, said pocket directly abutting said cylinder head 'at the exhaust port whereby the remainder of said `face plate overlies and is closely spaced with respect to the cylinder head fins adjacent said exhaust port.

3. The muffler as defi-ned in claim 2 and in which the inner end of said baille member is seated in said pocket and has a peripheral edge contacted by the inner periphery of said pocket, said pocket thereby preventing lateral displacement of said baille member.

4. An exhaust muiller for an internal combustion engine having a finned cylinder` head provided with an exhaust port, .said muffler comprising substantially oval shaped inner and outer walls and a peripheral side wall defining a substantially flattened laterally elongated chamber, one end of said inner wall having an inlet opening communicating with said exhaust port, said outer wall having an outlet opening disposed opposite theother end of lsaid inner wall and thereby being laterally offset from said inlet opening, a tubular baffle member longitudinally sandwiched between said inner and outer walls and Patented Mar. 21, 1961 peripherally enclosing only a portion of said chamber directly adjacent said inlet opening, and means securing said nluler to said cylinder head, said muffler extending laterally withV respect to said exhaust port, said inner wall comprising a substantially kflat oval face plate having an axially outwardly extruded pocket in the end having said inlet opening, said pocket directly abutting said cylinder head at the exhaust. port whereby the remainder of said face plate overlies and is closely spaced with respect'to the cylinder head ns adjacent said exhaust port, the inner end of saidA bafel member being seated in said pocket, said pocket therebyy preyenting lateral displacement of said bale member, andsaid baile comprising a substantially cylindrical perforated element disposed substantially concentric withl thecenter of said inlet opening, said meanssecuringsaid muer to said cylinder head comprising bolts extending through said outer wall and said pocket into'said cylinder head, said bafe element extendingV from said pocket to said' outer wall and serving to support same against deformation on tightening said bolts.

References Cited in the tile of this patent UNITED STATES PATENTS 659,834 Thamsen Oct. 16, 1900 953,778 Cordle Apr. 5, 1910 1,680,671 Eschholz Aug. 14, 1928 1,884,452 Weigman Oct. 25, 1932 1,993,863' Small et al. Mar. 12, 1935 2,050,581 Orem Aug. 11, 1936 2,838,129 Hesse et al. June l0, 1958 FOREIGN PATENTS 212,796 Great Britain Mar. 20, 1924 OTHER REFERENCES German application Ser. No. E7620, printed May 24, 1956 (Ia/46c).