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| Number | Title | Issue Date |
| 7380635 | Interference-based exhaust noise attenuation An interference-based exhaust noise attenuation device and method for exhaust flow from an internal combustion engine that generates compressive waves in the exhaust flow. The device includes at least a direct path for the exhaust flow; a looped path for the exhaust... | 06/03/2008 |
| 7367424 | Eccentric exhaust muffler for use with auxiliary power units A muffler system is provided for use with an auxiliary power unit. In one embodiment, and by way of example only, the system includes an outer can, an annular baffle, and a tube. The outer can has a sidewall including a forward end, an aft end, and a cavity extendin... | 05/06/2008 |
| 7364013 | Shell main body for muffler The shell main body for a muffler includes an inner shell in a cylindrical shape with a cross-section of an imperfect circle defined by small arc portions alternating with large arc portions; and an outer shell wrapping the inner shell and formed in a cylindrical sh... | 04/29/2008 |
| 7337877 | Variable geometry resonator for acoustic control The present invention provides a resonator for attenuating acoustic vibration from an air intake passage. The resonator includes a neck, a resonator chamber, a piston-type member, and an actuator. The neck is attached between the air passage and the resonator chambe... | 03/04/2008 |
| 7337876 | Suction apparatus with noise reduction means A suction apparatus is provided with noise reduction means in one or more airflow passages for reducing noise emission from an airflow generator or the like, wherein at least one airflow passage is provided with at least one indentation with a predetermined depth ex... | 03/04/2008 |
| 7334663 | Variable resonator A communicating pipe is disposed on an outer periphery of an air intake pipe, and a conduit is formed so as to be parallel to an air intake passage. A plurality of first communicating apertures are disposed through the air intake pipe so as to be arranged in a singl... | 02/26/2008 |
| 7299894 | Acoustic fluid machine An acoustic fluid machine includes an acoustic resonator, a valve device, a piston, and an actuator. The acoustic resonator has a larger-diameter base and a smaller-diameter upper end. The valve device is provided on the upper end of the acoustic resonator and has a... | 11/27/2007 |
| 7293628 | Shell main body for muffler A cylindrical shell main body constituting a muffler main body is formed of two layers of an inner shell and an outer shell and has a cylindrical shape with a cross section that is not a perfect circle but is defined by alternated small arc portions and large arc po... | 11/13/2007 |
| 7293627 | Active exhaust muffler An active exhaust muffler for an exhaust system of an internal combustion engine, having a housing through which a pipe system passes, the pipe system designed to be permeable for airborne sound in a first space, having an antisound generator which is arranged in a ... | 11/13/2007 |
| 7281605 | Mufflers with enhanced acoustic performance at low and moderate frequencies The invention relates to an exhaust silencer or muffler for an internal combustion engine, in particular a silencer with the damping characteristics of a resonator with the absorptive characteristics of a dissipative silencer. The silencer of the present invention p... | 10/16/2007 |
| 7278514 | Acoustic noise filter An acoustic filter is provided with a single flow chamber for exposure of a flexible rubber layer to liquid undergoing flow through the flow chamber with noise producing acoustic energy therein. The flexible rubber layer is supported on a cylindrical drum with slant... | 10/09/2007 |
| 7255197 | Muffler A muffler which reduces noises of a wide frequency band with a simple structure. Sound waves of an intake duct enter into and are received in a resonance box via a branch pipe. At the branch pipe, a movable body slidingly abuts a peripheral portion of an opening of ... | 08/14/2007 |
| 7252178 | Acoustic fluid machine An acoustic fluid machine such as an air compressor comprises an acoustic resonator, a valve device and a piston. Air is sucked into the resonator through the valve device at one end of the resonator. The piston at the other end of the resonator is reciprocated by a... | 08/07/2007 |
| 7246680 | Sound dampening assembly for automotive exhaust system A sound dampening assembly adapted to engage an exhaust pipe in an automotive engine exhaust system adjacent an outlet of an internal combustion engine. The assembly includes a bottle portion having a single opening and an interior defining a predetermined amount of... | 07/24/2007 |
| 7240769 | Exhaust volume An exhaust volume (20) of the type including a muffler (24) having a casing provided with an inlet (29) and an outlet (30) for passing gases and adapted to enable the muffler to be mounted in an exhaust system (14). The volume furt... | 07/10/2007 |
| 7194862 | Resonator adopting counter-bored holes and method of suppressing combustion instabilities A resonator for damping pressure waves or instabilities in a system supported by acoustic energy wherein the resonator adopts the use of counter-bored openings on the downstream side of the resonator within the flow path of the system. The resonator includes a first... | 03/27/2007 |
| 7117974 | Electronically controlled dual chamber variable resonator An in-line resonator for an air induction system of an internal combustion engine is provided. The system includes a resonator housing, an upstream duct, a downstream duct, a conduit, a partition, and a sleeve. The conduit extends through the resonator housing conne... | 10/10/2006 |
| 7017707 | Herschel-Quincke tube for vehicle applications An HQ tube arrangement suitable for packaging within a vehicle may be designed by creating a mathematical model representing a tube arrangement having a first passageway and a second passageway fluidly connected to the first passageway at first and second junctions.... | 03/28/2006 |
| 6905002 | Acoustic wave attenuator for a rail An actuator rail assembly for conveying an actuating fluid under pressure to at least one fuel injector, include an elongate fluid passageway being defined in a rail. A fluid inlet port is in fluid communication with the fluid passageway, the inlet port being fluidl... | 06/14/2005 |
| 6832664 | Clampless hose retainer mechanism A rubber hose of an air supply assembly is secured to a resonator by an inserted internal tube. A tapered insertion end of the internal tube is inserted into the rubber hose and slides along an angled surface of the rubber hose. The tapered insertion end presses the... | 12/21/2004 |
| 6789644 | Engine muffler In the engine muffler including a first expansion chamber 12 of the exhaust gas having an exhaust gas inlet aperture 11 connecting to an exhaust gas outlet of the engine, a second expansion chamber 14 having an exhaust gas outlet aperture 13 | 09/14/2004 |
| 6467570 | Spark arrester with spark filter An exhaust processor includes a housing formed to include an interior region and a partition or first spark arrester that partitions the interior region into chambers and includes a wool filter formed to include an opening. The wool filter is positioned t... | 10/22/2002 |
| 6296074 | Noise reducing exhaust system and method A time warp method of reducing noise in an exhaust stream includes the step of directing the exhaust stream into an inlet aperture of a sound cancellation chamber. The method also includes reflecting sound in the sound cancellation chamber toward the inle... | 10/02/2001 |
| 5996733 | Dual frequency side branch resonator A side branch resonator for attenuating sound waves of first and second frequencies, the side branch resonator comprising a discharge branch; a resonator branch; an inlet branch flow connected to the discharge branch having an axis, the resonator branch h... | 12/07/1999 |
| 5936210 | High performance muffler The improved high performance muffler is used to attenuate the sound waves in exhaust gases from internal combustion engines and the like and has a casing, which includes a closed volume defined by side walls, a top wall, a bottom wall and inlet and outle... | 08/10/1999 |
| 5925857 | Inverted cone tuned exhaust system An expansion chamber for the exhaust system of two cycle engines. The expansion chamber includes a diverging section and a converging section. The diverging section has a continually increasing cross-sectional area. A terminal section is integrally attach... | 07/20/1999 |
| 5894115 | Exhaust system apparatus and noise suppression method An exhaust system includes an exhaust pipe attached to the engine. Attached to the exhaust pipe is a muffler which has an exhaust gas inlet, a plurality of expansion chambers through which exhaust gas flows, and at least one wall between adjacent expansio... | 04/13/1999 |
| 5783780 | Sound absorption structure A sound absorption structure which is mainly applied to an intake system of an automotive engine for suppressing noise level. The sound absorption structure comprises a base duct portion, and an extended duct portion in which a sound absorption material i... | 07/21/1998 |
| 5773770 | Cross flow path exhaust muffler An exhaust muffler includes a housing having a rectangularly shaped hollow interior without fiberglass or other packing. An inlet tube and a first outlet tube extend through one side wall of the housing, and a second outlet tube extends through an opposit... | 06/30/1998 |
| 5739484 | Exhaust muffler An exhaust muffler includes a housing having a rectangularly shaped interior without fiberglass or other packing, an inlet tube on a first end portion of the housing for conveying exhaust gases to the interior, an outlet tube on an opposite second end por... | 04/14/1998 |
| 5602368 | Muffler for an internal combustion engine In the exhaust fluid path, there are provided a porous pipe that is in communication with a muffling chamber via a plurality of small through-holes formed across a wall thickness of the pipe, and an inner pipe of a given length is inserted in the porous p... | 02/11/1997 |
| 5541374 | Resonator type silencer A resonator type silencer used in the air intake duct of an intake system of an internal combustion engine comprises a first case member which includes a generally cup-shaped section. A pipe section is integral with the cup-shaped section and extends thro... | 07/30/1996 |
| 5502283 | Muffler A muffler including an offshoot path, one end of which is connected to a middle of a ventilation path so as to diverge from the ventilation path, and another end of which is closed. One portion of the offshoot path and another portion thereof are communic... | 03/26/1996 |
| 5496975 | Plug muffler for aircraft and method of construction thereof An improved aircraft muffler and the method of making it is disclosed. It is a plug muffler design having an outer housing and an internal exhaust conduit. The exhaust conduit has a center partition that blocks the flow of exhaust gas through the conduit.... | 03/05/1996 |
| 5349141 | Resonator type silencer having plural resonance chambers A resonator type silencer installed in an intake system of an automotive internal combustion engine. The resonator type silencer comprises a generally cup-shaped base member integrally connected with an air duct through which intake air to be inducted int... | 09/20/1994 |
| 5329074 | Marine engine exhaust muffler An exhaust muffler for mounting on the transom of a powerboat in association with the exhaust pipes which extend through the transom. The muffler comprises a housing extending laterally across the stern of the boat and rearwardly from the transom to defin... | 07/12/1994 |
| 5227593 | Muffler assembly for engine Muffler assembly for an engine comprises an outer cylinder constituting a muffler body, an inner cylinder coaxially disposed in the outer cylinder, a connection cylinder disposed inside the inner cylinder having one end on an upstream side and another end... | 07/13/1993 |
| 5183976 | Adjustable sound attenuating device An adjustable sound attenuating device comprised of an elongated outer main shell of a predetermined diameter, with an inlet coupling and an outlet coupling. The device has located within the shell singular or multiple independent baffle components compri... | 02/02/1993 |
| 5183977 | Muffler assembly of internal combustion engine A muffler assembly of an internal combustion engine comprises an inner casing in which is defined a first expansion chamber into which is inserted one end of the exhaust pipe having another end connected to an exhaust gas port of the engine, an outer casi... | 02/02/1993 |
| 5025889 | Engine noise reducer A noise reducer for an engine induction system comprises an outer duct having an inlet and outlet, and an inner duct having an inlet and outlet. The inner duct has a contained portion including the inner duct outlet and a portion of the inner duct adjacen... | 06/25/1991 |