Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3176791 A
Publication typeGrant
Publication dateApr 6, 1965
Filing dateNov 12, 1963
Priority dateNov 12, 1963
Publication numberUS 3176791 A, US 3176791A, US-A-3176791, US3176791 A, US3176791A
InventorsWilliam M Betts, Reginald C Requa
Original AssigneeWilliam M Betts, Reginald C Requa
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Mufflers for marine engines
US 3176791 A
Abstract  available in
Images(1)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

April 6, 1965 w. M. BETTS ETAL MUFFLERS FOR MARINE ENGINES Filed Nov. 12, 1963 INVENTORJ' vm A BY T zy W United States Patent This invention relates to exhaust mufflers primarily intended for marine engines, said mufilers being of the socalled wet type, an example of which is shown in US. patent to Betts, No. 3,077,240, date February 12, 196 3.

It is an object of the present invention to provide a muffler of this character which will present a relatively large surface area exposed to outside air and without an increase of the overall size of the muifier shell, thereby adding to the cooling effect.

It is an object of the invention to provide a muffler in which the coolant water of the engine is trapped and with which the hot expanding engine exhaust gases mix and are cooled.

It is an object of the invention to provide a muffler having a body or shell of such shape that it greatly resists internal explosions or back-firing and thereby prevents muffler damage often caused thereby.

It is a further object of the invention to provide a mufiler having its baffies formed integrally with the body or shell of the mufiler so that such baflles will not become loosened or detached and blow out as a result of backfire.

It is still another object of the invention to provide a 1;

in axial disalignment, the shell being provided with a a plurality of spaced-apart, circumferential deep grooves resulting in the production of battles extending partly across the interior of the shell, said baffles being composed of distorted portions of the upper and lower shells and having spaced walls defining air spaces between them, this arrangement serving to provide large surfaces exposed to outside air adding materially to the cooling effect that is obtained.

With these and other objects to be hereinafter set forth in view, we have devised the arrangement of parts to be described and more particularly pointed out in the claims appended hereto.

In the accompanying drawing, wherein an illustrative embodiment of the invention is disclosed,

FIG. 1 is a side elevational View of a muffler, constructed in accordance with the invention, with a portion of the exhaust pipe being shown in section;

FIG. 2 is a sectional view, taken substantially on the line 22 of FIG. 1, looking in the direction of the arrows;

FIG. 3 is a sectional view, taken substantially on the line 3--3 of FIG. 2, looking in the direction of the arrows; and

FIG. 4 is a sectional view, taken substantially on the line 4-4 of FIG. 1, looking in the direction of the arrows.

In the embodiment of the invention as illustrated, the shell or body of the muffler is generally indicated at 1, and the same is composed of two parts indicated respectively at 2 and 3. Both of these shell sections may, if desired, be composed of fiberglass or other suitable plastic material, or of metal, and each of these shell sections is generally semi-circular in cross-sectional shape and provided with small radially-extending flanges 4, through which fastening elements 5 may be extended to unite the two sections together or other fastening means can be used, the two sections when secured together forming the hollow muflier shell or body as shown.

The body of the shell 1 can, if desired, be made in one-piece by the so-called blow-mold process of molding and particularly when the shell is composed of polyethyl ene or of a material having similar characteristics, such operation being rapid, and reducing the cost of manufacturing.

In the shell, made as shown described, there is provided at one end an inlet pipe 6, the body or shell being contracted to form said inlet pipe. At the opposite end of the shell is located the outlet pipe 7, the shell being also contracted at that end to form the latter pipe. It will be noted that the inlet and outlet pipes are axially disaligned and this disalignment of the two pipes is an important feature of the present invention.

The lower shell section shown at 3 is provided at spaced intervals with grooves 8, these grooves in this section forming an opening for the gases and Water to pass through, this opening being slightly larger in area than the opening in pipe 7, to eliminate back pressure.

In the opposite or upper section of the shell, or that shown at 2, a plurality of spaced, deep, circumferentiallyextending indentations or grooves 9 is provided, the formation of such grooves 9 resulting in a deformation of the shell section 2 at spaced points to thereby produce a plurality of double-walled bafiles 10 extending into the interior of the shell and across a substantial portion of the depth of the same and to a depth nearly equal to the depth of the shell section 2. The production of these bafiies ill results in the formation of chambers or pockets 11 between them as clearly seen in FIG. 3.

The bafiies 10, produced by the deformation and deep grooving of both shell sections 2 and 3 provides spacedapart opposing walls 12 and 13, resulting in the production of spaces or air grooves 14 between such walls. The result is that a relatively large surface area is provided and as air can pass through the grooves 8 and 9 to contact the wall surfaces 12 and 13, the cooling effect is materially increased.

In order to provide for suitable reinforcement for the inlet and outlet pipes 6 and 7, these pipes may be interiorly reinforced by means of stainless steel inserted perforated sleeves, one of which is shown in the outlet pipe 7 at 15. These sleeves may be provided in both the inlet and exhaust or outlet pipes, and when they are inserted during the molding of the muffler shell, part of the shell sections will exude through the holes in the sleeves as shown at 16, and after curing, or hardening, will lock the sleeves in place. These sleeves provide added reinforcement to the pipes 6 and 7, so that the clamps which are used to hold the mufller in place will be supported.

From the foregoing, the operation of the improved mufiier will be apparent. The hot exhaust gases and water from the engine enter into the muffier as indicated at 20, and the shape of the mufller shell, coupled with the disalignment of the inlet and outlet pipes thereof, traps the coolant water as shown at 21 in the lower section 3 of the shell below the baffles 10. As diagrammatically illustrated in FIG. 3, the hot expanding gases will mix with the coolant Water and the expansion is halted. The cooling of the gases reverses the expansion action and, thus back pressure, which causes loss of power, is lowered. The large surface area that is exposed because of the double-walled bafile formation, aids materially in effecting cooling. The shape of the muffler shell is such as to provide for greater strength to resist damage from possible back-fire, and the absence of separate bafiles provides for a relatively indestructible construction.

Having thus described a single embodiment of the invention, it is obvious that the same is not to be restricted thereto, but is broad enough to cover all structures coming within the scope of the annexed claims.

What we claim is:

1. A mufiler for marine engines comprising, an elongated hollow shell composed of upper and lower sections forming a hollow body, the uppermost of the sections having a plurality of spaced, relatively deep indentations extending across it and transversely to the longitudinal axis of the shell, said indentations forming double-walled bafiles having their walls spaced apart on the outside of said upper section to form air spaces between such walls, and gas expansion chambers between such walls on the inside said baflles extending on the inside of the shell to the center of the upper shell section on which they are formed, the lower shell section having transverse indentations of considerably less depth than those which are formed in the upper section, creating inline openings between the outer ports, whereby Water is trapped in the lower section located below the terminations of the baffies in the upper section.

2. A muffler for marine engines comprising, an elongated hollow shell composed of shell sections joined together on a longitudinal line, the shell having inlet and outlet ports respectively located at its opposite ends, said ports being in axial disalignment, the internal shell sections being provided between the outer ports with a straight passage of greater diameter than the diameter of the ports,

to compensate for the volume of water trapped, one section of the shell being inwardly distorted at spaced intervals to form double-walled baffles for approximately the depth of the shell section on which they are formed, the other section of the shell being indented but with its indentations of less depth than those in the first-mentioned shell section, whereby the battles in the first section form interruptions in said section and those in the second section do not substantially interfere with the continuity of the straight passage through said section.

References Cited by the Examiner UNITED STATES PATENTS 1,426,352 8/22 Brush 181-47 1,815,005 7/31 Hamilton et al 181-62 X 1,821,013 9/31 Hamilton 181-70 X 2,484,827 10/49 Harley 181-49 X 2,859,830 11/58 Holler.

2,877,860 3/59 Hotter. 2,882,072 4/59 Noland 285-239 X 3,077,240 2/63 Betts -Q. 181-61 X 3,080,939 3/63 Kelly 181-52 X 3,095,944 7/63 Buxton 181-57 FOREIGN PATENTS 1,162,405 4/58 France. 287,597 7/31 Italy.

LEO SMILOW, Primary Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1426352 *Jun 27, 1917Aug 22, 1922Brush Alanson PMuffler
US1815005 *Dec 5, 1928Jul 14, 1931Hamilton Francis FExhaust gas muffler
US1821013 *Feb 7, 1929Sep 1, 1931Hamilton Muffler CompanyExhaust gas silencer
US2484827 *Oct 17, 1946Oct 18, 1949Bertron G HarleyBaffle type muffler with corrugated casing
US2859830 *Jul 22, 1955Nov 11, 1958Henry S HoffarVibratory flexible silencers
US2877860 *Jul 23, 1956Mar 17, 1959Hoffar Henry StonestreetApertured pliable resilient damper wall silencer
US2882072 *Jan 13, 1955Apr 14, 1959Reinhold Engineering & PlasticEnd connector embedded in a rigid non-metallic tube
US3077240 *Jun 5, 1961Feb 12, 1963William M BettsFiber glass wet muffler for marine engines
US3080939 *Oct 19, 1960Mar 12, 1963Aircraft Prec Products IncMarine type muffler
US3095944 *Oct 27, 1960Jul 2, 1963Griffith Rubber MillsMuffler
FR1162405A * Title not available
IT287597B * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3324533 *Jun 2, 1965Jun 13, 1967Sutton Power Equipment LtdMethod of making water jacketed exhaust manifold
US3638756 *Dec 30, 1969Feb 1, 1972United States Steel CorpVehicle muffler and method of assembly
US4019456 *May 5, 1976Apr 26, 1977Whittaker CorporationMarine wet exhaust system and improvements in powered marine vessel
US4700806 *Nov 25, 1986Oct 20, 1987Ap Industries, Inc.Stamp formed muffler
US4736817 *Jun 8, 1987Apr 12, 1988Ap Industries, Inc.Stamp formed muffler
US4759423 *Jun 11, 1987Jul 26, 1988Ap Industries, Inc.Tube and chamber construction for an exhaust muffler
US4760894 *Jun 11, 1987Aug 2, 1988Ap Industries, Inc.Exhaust muffler with angularly aligned inlets and outlets
US4765437 *Oct 7, 1987Aug 23, 1988Ap Industries, Inc.Stamp formed muffler with multiple low frequency resonating chambers
US4821840 *Jan 20, 1988Apr 18, 1989Ap Parts Manufacturing CompanyStamp formed exhaust muffler with conformal outer shell
US4836330 *Aug 3, 1988Jun 6, 1989Ap Industries, Inc.Plural chamber stamp formed muffler with single intermediate tube
US4847965 *Oct 18, 1988Jul 18, 1989Ap Parts Manufacturing CompanyMethod of manufacturing stamp formed mufflers
US4860853 *Dec 20, 1988Aug 29, 1989Ap Parts Manufacturing CompanyStamp formed muffler with nonplanar array of tubes
US4894987 *Aug 19, 1988Jan 23, 1990Ap Parts Manufacturing CompanyStamp formed muffler and catalytic converter assembly
US4901815 *Mar 20, 1989Feb 20, 1990Parts Manufacturing CompanyStamp formed mufflers
US4901816 *Jan 23, 1989Feb 20, 1990Ap Parts Manufacturing CompanyLight weight hybrid exhaust muffler
US4905791 *Jun 27, 1989Mar 6, 1990Ap Parts Manufacturing CompanyLight weight hybrid exhaust muffler and method of manufacture
US4909348 *Nov 7, 1988Mar 20, 1990Ap Parts Manufacturing CompanyStamp formed exhaust muffler with conformal outer shell
US4924968 *Aug 3, 1988May 15, 1990Ap Parts Manufacturing CompanyStamp formed muffler with reinforced outer shell
US4928372 *Apr 7, 1989May 29, 1990Ap Parts Manufacturing CompanyProcess for manufacturing stamp formed mufflers
US4958701 *Mar 26, 1990Sep 25, 1990Ap Parts Manufacturing CompanyStamp formed muffler with pocket-free baffle crease
US5004069 *Jan 26, 1990Apr 2, 1991Ap Parts Manufacturing CompanyStamp formed muffler with transverse baffle tube
US5022877 *Feb 16, 1990Jun 11, 1991Vernay Laboratories, Inc.Marine exhaust system
US5147232 *Aug 30, 1991Sep 15, 1992Marine Muffler CorporationMarine engine exhaust system and method
US5173577 *Sep 4, 1990Dec 22, 1992Ap Parts Manufacturing Co.Stamp formed muffler with low back pressure
US5252788 *Apr 10, 1992Oct 12, 1993Ap Parts Manufacturing Co.Stamp formed muffler with in-line expansion chamber and arcuately formed effective flow tubes
US5259797 *Sep 11, 1992Nov 9, 1993Marine Muffler CorporationMarine engine exhaust system and method
US5428194 *Oct 19, 1993Jun 27, 1995Ap Parts Manufacturing CompanyNarrow width stamp formed muffler
US5448831 *Nov 8, 1993Sep 12, 1995Ap Parts Manufacturing CompanyMethod of manufacturing a stamp formed muffler with hermetically sealed laminated outer shell
US5594217 *Aug 9, 1995Jan 14, 1997Lequire; Wayne A.Exhaust muffler for small marine craft
US5597986 *Feb 27, 1995Jan 28, 1997Ap Parts Manufacturing CompanyStamp formed muffler with nested chambers
US5717173 *Mar 22, 1996Feb 10, 1998Ap Parts Manufacturing CompanyExhaust mufflers with stamp formed internal components and method of manufacture
US5816361 *Sep 17, 1997Oct 6, 1998Ap Parts Manufacturing CompanyExhaust mufflers with stamp formed internal components and method of manufacture
US5907904 *Jul 28, 1997Jun 1, 1999Ap Parts Manufacturing CompanyMethod of manufacturing an exhaust muffler with stamp formed internal components
US6341664Jan 13, 2000Jan 29, 2002Goerlich's Inc.Exhaust muffler with stamp formed internal assembly
US6892855Feb 25, 2003May 17, 2005Tenneco Automotive Operating Company Inc.Embossed shell for spun mufflers
US7681690Jul 8, 2008Mar 23, 2010Longyear Tm, Inc.Noise abatement device for a pneumatic tool
US7730996Apr 12, 2006Jun 8, 2010Ocv Intellectual Capital, LlcLong fiber thermoplastic composite muffler system with integrated crash management
US7735603May 28, 2008Jun 15, 2010Longyear Tm, Inc.Noise reducing device for a pneumatic tool
US7845464Dec 7, 2010Longyear Tm, Inc.Noise abatement device for a pneumatic tool
US7934580May 3, 2011Ocv Intellectual Capital, LlcLong fiber thermoplastic composite muffler system
US7942237Dec 14, 2006May 17, 2011Ocv Intellectual Capital, LlcLong fiber thermoplastic composite muffler system with integrated reflective chamber
US8215449Jul 10, 2012Longyear Tm, Inc.Muffler system for noise abatement and ice control
US20040163885 *Feb 25, 2003Aug 26, 2004Warmenhoven John LewisEmbossed shell for spun mufflers
US20070240932 *Dec 14, 2006Oct 18, 2007Van De Flier Peter BLong fiber thermoplastic composite muffler system with integrated reflective chamber
US20070240934 *Apr 12, 2006Oct 18, 2007Van De Flier PeterLong fiber thermoplastic composite muffler system
US20090014236 *Apr 12, 2006Jan 15, 2009Van De Flier Peter BLong fiber thermoplastic composite muffler system with integrated crash management
US20090090530 *Jul 8, 2008Apr 9, 2009Longyear Tm, Inc.Noise abatement device for a pneumatic tool
US20090294211 *May 28, 2008Dec 3, 2009Longyear Tm, Inc.Noise reducing device for a pneumatic tool
US20100155174 *Mar 10, 2010Jun 24, 2010Longyear Tm, Inc.Noise abatement device for a pneumatic tool
US20100307863 *Dec 12, 2008Dec 9, 2010Ocv Intellectual Capital, LlcComposite muffler system thermosetable polymers
US20110126541 *Dec 2, 2009Jun 2, 2011Longyear Tm, Inc.Muffler system for noise abatement and ice control
USRE33370 *May 10, 1989Oct 9, 1990Ap Parts Manufacturing CompanyStamp formed muffler
WO1989004915A2 *Nov 17, 1988Jun 1, 1989Yamato Kogyo Company, LimitedAutomotive exhaust system with resin muffler associated with exhaust gas cooling system
WO1989004915A3 *Nov 17, 1988Jun 15, 1989Yamato Kogyo KkAutomotive exhaust system with resin muffler associated with exhaust gas cooling system
Classifications
U.S. Classification181/260, 285/239
International ClassificationF01N7/00
Cooperative ClassificationF01N2530/20, F01N13/005, F01N2590/02, F01N2530/18
European ClassificationF01N13/00C2
Legal Events
DateCodeEventDescription
Nov 17, 1980ASAssignment
Owner name: D.T. PARKS CORPORATION, A CORP. OF, FLORIDA
Effective date: 19801030
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WILLIAM M. BETTS;REEL/FRAME:003810/0448