Multi-fold side branch muffler
First Claim
1. A muffler for attenuating the sounds of combustion gases exhausted from an internal combustion engine comprising:
- a cylindrical inner casing having an inlet in fluid communication with said gases exhausted from said engine and an outlet through which said gases are exhausted to atmosphere, said inner casing axially extending between said inlet and said outlet to define an open ended inner chamber through which said gases pass;
a cylindrical outer casing concentric with said inner casing, spaced radially outward from and completely circumscribing said inner casing and axially extending substantially the distance between said inlet and said outlet, said outer casing having radial end sections at said inlet and said outlet extending to said inner casing to define a closed ended outer chamber whereby said outer chamber is an axially extending annular chamber concentric with said inner chamber;
slotted opening means providing substantially unimpeded fluid communication between said inner and outer chambers at a set axial position; and
,sound attenuation means within said outer chamber for producing reflected waves attenuating at least one sound wave of a set frequency;
said sound attenuation means includes a plurality of intermediate, concentric cylindrical casings within said outer chamber, said intermediate casings axially extending substantially the distance of said outer chamber and overlying one another, each pair of radially adjacent casings forming an annular, axially extending sound attenuation passage, each sound passage having an entrance in fluid communication with a pressure wave at one axial end thereof and a sound reflecting wall at its opposite end to establish a second path therebetween whereby a plurality of sound waves at different set frequencies are attenuated.
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Accused Products
Abstract
A compact muffler has a straight through inner cylindrical casing surrounded by an outer cylindrical casing defining a closed ended sound attenuating chamber therebetween. Within the outer chamber a plurality of axially extending, radially overlying, cylindrical intermediate casings form a plurality of annular sound attenuating passages. The sound passages are configured to have entrances in fluid communication either with an especially configured slot in the inner casing or between certain passages to define a plurality of discrete sound paths, with each sound path having a set length sufficient to generate a reflection wave for attenuating a sound wave having a frequency correlated to the distance of the sound path.
59 Citations
37 Claims
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1. A muffler for attenuating the sounds of combustion gases exhausted from an internal combustion engine comprising:
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a cylindrical inner casing having an inlet in fluid communication with said gases exhausted from said engine and an outlet through which said gases are exhausted to atmosphere, said inner casing axially extending between said inlet and said outlet to define an open ended inner chamber through which said gases pass; a cylindrical outer casing concentric with said inner casing, spaced radially outward from and completely circumscribing said inner casing and axially extending substantially the distance between said inlet and said outlet, said outer casing having radial end sections at said inlet and said outlet extending to said inner casing to define a closed ended outer chamber whereby said outer chamber is an axially extending annular chamber concentric with said inner chamber; slotted opening means providing substantially unimpeded fluid communication between said inner and outer chambers at a set axial position; and
,sound attenuation means within said outer chamber for producing reflected waves attenuating at least one sound wave of a set frequency; said sound attenuation means includes a plurality of intermediate, concentric cylindrical casings within said outer chamber, said intermediate casings axially extending substantially the distance of said outer chamber and overlying one another, each pair of radially adjacent casings forming an annular, axially extending sound attenuation passage, each sound passage having an entrance in fluid communication with a pressure wave at one axial end thereof and a sound reflecting wall at its opposite end to establish a second path therebetween whereby a plurality of sound waves at different set frequencies are attenuated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A muffler for attenuating the sounds of combustion gases exhausted from an internal combustion engine comprising:
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a tubular inner casing having an inlet in fluid communication with said gases exhausted from said engine and an outlet through which said gases are exhausted to atmosphere, said inner casing axially extending between said inlet and said outlet to define an open ended inner chamber through which said gases pass; an outer casing spaced radially outward from and at least partially circumscribing said inner casing and axially extending substantially the distance between said inlet and said outlet, said outer casing having radial end sections at said inlet and said outlet extending to said inner casing to define a closed ended outer chamber; slotted opening means providing substantially unimpeded fluid communication between said inner and outer chambers at a set axial position; sound attenuation means within said outer chamber for producing reflected waves attenuating at least one sound wave of a set frequency; and
,said inner casing is unobstructed and has a diameter approximately that of said inlet and said outlet whereby said muffler induces little back pressure on said engine.
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17. A muffler for attenuating exhaust gas sounds comprising:
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a generally cylindrical, open ended inner casing axially extending from an inlet end to an outlet end, said inner casing defining an inner chamber circumscribed thereby through which exhaust gases flow; a generally cylindrical closed end outer casing, said outer casing generally concentric with said inner casing and axially extending the length of said inner casing to define an outer chamber therebetween, said closed end of said outer casing including an outlet end section extending radially inward from said outer casing to said inner casing generally adjacent said outlet and an inlet end section extending radially inward from aid outer casing to said inner casing generally adjacent said inlet; a plurality of general cylindrical, concentric intermediate casings axially extending within said outer chamber, spacer means between radially adjacent intermediate casings for maintaining said intermediate casings in radially spaced, generally overlying relationship to one another, each adjacent pair of casings forming an annular, axially extending sound attenuation passage therebetween, each sound passage having an entrance at one of its ends and a sound reflecting wall at its opposite end establish a sound path between its ends;
selected sound passages being in fluid communication with said inner chamber at said entrances and selected sound passages being in fluid communication with adjacent sound passages at said entrances thereof to establish a plurality of different length sound paths through said sound passages; andslotted opening means at a set axial position in said inner casing for providing fluid communication between said inner and outer chamber whereby sound wave energy is transmitted through said slotted opening means into selected sound passages having entrances in fluid communication with said inner chamber for attenuation of a multiplicity of sound waves having set frequencies correlated to the length of said sound paths. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. In a muffler for attenuating the sounds of exhaust gases produced by an internal combustion engine, the muffler including a housing with an exhaust inlet and an exhaust outlet and a tubular inner casing axially extending from said inlet to said outlet defining an inner chamber extending therein through which said exhaust gases pass, the improvement comprising:
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an outer casing at least partially circumscribing said inner casing and axially extending substantially the length of said inner casing, said outer casing defining with said inner casing a closed outer chamber therebetween; a plurality of general cylindrical, concentric intermediate casings axially extending within said outer chamber, spacer means between radially adjacent intermediate casings for maintaining said intermediate casings in radially spaced, generally overlying relationship to one another, each adjacent pair of casings forming an annular, axially extending sound attenuation passage therebetween, each sound passage having an entrance at one of its ends and a sound reflecting wall at its opposite end establish a sound path between its ends;
selected sound passages being in fluid communication with said inner chamber at said entrances and selected sound passages being in fluid communication with adjacent sound passages at said entrances thereof to establish a plurality of different length sound paths through said sound passages; and
,slotted opening means at a set axial position in said inner casing for providing fluid communication between said inner and outer chamber whereby sound wave energy is transmitted through said slotted opening means into selected sound passages having entrances in fluid communication with said inner chamber for attenuation of a multiplicity of sound waves having set frequencies correlated to the length of said sound paths. - View Dependent Claims (29, 30, 31, 32, 33)
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34. A muffler for attenuating the sounds of exhaust gases from an internal combustion engine comprising:
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a generally cylindrical, axially extending inner casing through which exhaust gases flow in a substantially unimpeded, straight through manner from an inner casing inlet to an inner casing outlet, said inner casing defining an open ended inner chamber; a generally cylindrical outer casing concentric with and spaced radially outwardly from said inner casing, said outer casing at least partially circumscribing said inner casing and axially extending a substantial distance along the length of said inner casing, said outer casing having at each of its ends a radially inwardly extending end section to define a generally annular closed outer chamber; a slotted opening associated with said inner casing providing fluid communication from said inner chamber to said closed outer chamber, said slotted opening at a fixed axial distance with respect to said inner casing for producing a reflected sound wave corresponding to the axial distance of said closed outer chamber relative to said slotted opening. - View Dependent Claims (35, 36, 37)
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Specification