Retroverted Patents (Class 181/265)
  • Patent number: 10753699
    Abstract: An improved firearm suppressor is provided. The firearm suppressor generally includes a primary flow path and a secondary flow path. The primary flow path is centrally disposed within the suppressor and includes multiple internal chambers that are separated by conical baffles. The secondary flow path is helically disposed within the firearm suppressor. A diverter directs a portion of the propellant gas rearward, over a firearm barrel, before entering spiral lanes in the forward direction. The primary flow path slows the movement of propellant gas escaping through a projectile exit port, while the secondary flow path slows the movement of propellant gas escaping through a plurality of propellant gas exit ports.
    Type: Grant
    Filed: October 7, 2019
    Date of Patent: August 25, 2020
    Assignee: UT-Battelle, LLC
    Inventors: James W. Klett, William C. Moss, Andrew T. Anderson
  • Patent number: 10711670
    Abstract: A muffler devised particularly for a small, reciprocating-piston two-stroke internal combustion engine of the type used on unmanned aerial vehicles. The muffler comprises a body incorporating an inlet, an outlet, and a plurality of chambers for exhaust gas flow from the inlet to the outlet. The body is configured to present a compact profile for installation on the engine. The chambers are so configured that adjacent chambers communicate to facilitate exhaust gas flow from the inlet to the outlet via flow passages. The various chambers comprise an inner chamber, an outer chamber, and one or more intervening chambers disposed between the inner and outer chambers. The various chambers are disposed one about another in annular formation. This arrangement creates a long flow path from the inlet to the outlet incorporating various directional changes.
    Type: Grant
    Filed: June 17, 2016
    Date of Patent: July 14, 2020
    Assignee: ORBITAL AUSTRALIA PTY LTD
    Inventors: Stephen John Karay, Mario Charles Muscat, Pouria Mehrani
  • Patent number: 10539075
    Abstract: A heat storage mechanism, of a heat exchanger, which does not shorten the service life of the heat exchanger even when a facility using the heat exchanger is intermittently operated and which suppresses a decrease in efficiency at the time of restart of the facility, is provided. The heat storage mechanism for storing heat of a heat exchanger during stop of operation of a facility provided with the heat exchanger includes an outflow prevention unit configured to prevent outflow of an exhaust gas to the outside, which is a heating medium of the heat exchanger, during stop of operation of the facility is provided in an exhaust passage through which the exhaust gas is discharged to the outside.
    Type: Grant
    Filed: October 29, 2015
    Date of Patent: January 21, 2020
    Assignee: KAWASAKI JUKOGYO KABUSHIKI KAISHA
    Inventor: Kazuhiko Tanimura
  • Patent number: 10533819
    Abstract: A conduit (5) with a bullet passage (13, 17) extends forward from a gun muzzle (7). Inner and outer concentric chambers (25, 29) surround the conduit and a forward portion of the barrel (3). A gas path (P2, P3, P4) is provided through sides of the conduit into the inner chamber, thence to the outer chamber, and then exits to the atmosphere at the front of the outer chamber. Each chamber has longitudinal lines of sight between front and back sound reflectors (R1-R2, R3-R4), and no longitudinal line of sight from the back reflector (R2, R4) to the atmosphere. The gas path through the suppressor is at least 6 times less flow-restrictive than the gas path through the bullet exit (17) or back into the barrel bore (4), minimizing backpressure. The gas path (P3) between the inner and outer chambers is through apertures (33) limited to a lengthwise middle portion of an inner shell (21) that divides the chambers (25, 29).
    Type: Grant
    Filed: June 29, 2018
    Date of Patent: January 14, 2020
    Inventor: Gerald R. Thomas
  • Patent number: 10415600
    Abstract: A turbocharger and a method are disclosed. The turbocharger includes a casing having an inlet end and an outlet end. A flow passage within the casing may have a substantially continuous inner surface and may be configured to pass inlet air from the inlet end to the outlet end. A compressor wheel may be located in the casing and may have at least one main blade and may be configured to rotate within the casing to compress the inlet air. A flow disrupting feature on the casing may be configured to disrupt the continuity of the inner surface and may be located at a leading edge of the at least one main blade. The flow disrupting feature may be closed to upstream communication with the flow passage except via the flow passage.
    Type: Grant
    Filed: August 12, 2016
    Date of Patent: September 17, 2019
    Assignee: Ford Global Technologies, LLC
    Inventors: Ahsanul Karim, Brian W. Lizotte, Keith D. Miazgowicz, Abdelkrim Zouani
  • Patent number: 10369533
    Abstract: Dosing and mixing exhaust gas includes directing exhaust gas towards a periphery of a mixing tube that is configured to direct the exhaust gas to flow around and through the mixing tube to effectively mix and dose exhaust gas within a relatively small area. Some mixing tubes include a slotted region and a non-slotted region. Some mixing tubes include a louvered region and a non-louvered region. Some mixing tubes are offset within a mixing region of a housing.
    Type: Grant
    Filed: September 12, 2014
    Date of Patent: August 6, 2019
    Assignee: Donaldson Company, Inc.
    Inventors: Matthew S. Whitten, Bruce Bernard Hoppenstedt
  • Patent number: 10335890
    Abstract: In a seam welding method, a pressing force applied to workpiece by roller electrodes is reduced and an energization to the roller electrodes is stopped when the roller electrodes pass at least a portion where metal sheets are temporarily fastened together through spot welding, and the pressing force to the workpiece by the roller electrodes and the energization to the roller electrodes are restored after the roller electrodes have passed the spot welded portion.
    Type: Grant
    Filed: June 25, 2014
    Date of Patent: July 2, 2019
    Assignee: HONDA MOTOR CO., LTD.
    Inventors: Yasuhiro Kawai, Noriko Kurimoto, Mitsugu Kaneko, Haruhiko Kobayashi, Kazuhiko Yamaashi
  • Patent number: 10113826
    Abstract: An apparatus and system are provided for a firearm suppressor. The system, in one embodiment, includes an elongated core comprising at least one series of ports extending radially from a bore to an exterior surface of the core, where the at least one series of ports is disposed linearly along a longitudinal axis of the core, and where the elongated core comprises at least one trough formed in the exterior surface of the core. The system also includes a baffle sleeve disposed around the core, the baffle sleeve having at least one uninterrupted fluid pathway extending along the exterior surface of the baffle sleeve and formed by interdigitated baffle ridges, and an outer tube disposed around the baffle sleeve.
    Type: Grant
    Filed: January 20, 2017
    Date of Patent: October 30, 2018
    Assignee: NG2 Defense, LLC
    Inventor: Ernest R. Bray
  • Patent number: 9938870
    Abstract: An exhaust gas muffler of an internal combustion engine, including a muffler housing having an exhaust gas inlet and an exhaust gas outlet and including a first Helmholtz resonator made of a first housing portion that delimits a first Helmholtz volume and includes a first coupling pipe. At least one second Helmholtz resonator is provided made of a second housing portion that delimits a second Helmholtz volume and includes a second coupling pipe via which the second Helmholtz volume can be coupled to an exhaust gas flow A of the exhaust gas inlet. The second coupling pipe is arranged at least partly within the first coupling pipe, and both coupling pipes delimit an annular gap R via which the first Helmholtz volume can be coupled to the exhaust gas flow A.
    Type: Grant
    Filed: March 2, 2015
    Date of Patent: April 10, 2018
    Assignee: TENNECO GMBH
    Inventors: Frank Reichelt, Gabriel Ostromecki
  • Patent number: 9803667
    Abstract: A vortex flow apparatus including a cylindrical housing that contains a fluid that flows in a swirling circular path. The apparatus may be utilized as a muffler for a combustion engine, a particle separator, or an energy conversion device that physically or chemically acts upon the fluid flow and particles contained within the apparatus. The housing defines an inlet opening that opens into the first end of the housing proximate a first end wall. An outlet tube defines an outlet opening through a first end wall. A projection is attached to a second end wall of the housing and extends into the housing. The outlet tube and projection are aligned with and centered relative to a central axis.
    Type: Grant
    Filed: May 15, 2015
    Date of Patent: October 31, 2017
    Assignee: VTX TECHNOLOGY LLC
    Inventors: John L. Brock, Lynn L. Faulkner, David H. Hill
  • Patent number: 9784167
    Abstract: The exhaust pipe comprises an inlet pipe, an outlet pipe and a bend portion arranged between the inlet pipe and the outlet pipe. The bend portion comprises an inlet bend and an outlet bend, wherein a central bend portion defines an intermediate section of inlet bend and outlet bend and wherein the inlet bend and the outlet bend each cover 50 percent of the total bend angle covered by the bend portion. The central bend portion comprises a diameter, which is smaller than a diameter of the inlet bend and of the outlet bend in a bending plane. In addition a bend radius R of the bend portion varies along the bend portion such that a bend radius of the inlet bend is larger than a bend radius of the outlet bend.
    Type: Grant
    Filed: September 4, 2014
    Date of Patent: October 10, 2017
    Assignee: Bosal Emission Control Systems NV
    Inventors: Filip Dörge, Eric Hansenne, Karel Vergote, Meiko Wezenaar
  • Patent number: 9631527
    Abstract: A first connection pipe, which penetrates a partition wall, and extends to a second expansion chamber side from inside a first expansion chamber, and a second connection pipe, which extends to an exhaust outlet side from the partition wall inside the second expansion chamber are provided; first outer periphery connection holes, which allow exhaust gas from an exhaust pipe to flow out to the second expansion chamber, are formed in the outer peripheral surface of the first connection pipe; second outer periphery connection holes which allow the exhaust gas having flowed out to the second expansion chamber through the first outer periphery connection holes to flow into the second connection pipe, are formed in the outer peripheral surface of the second connection pipe; the first connection pipe and the second connection pipe are arranged such that they are partially parallel to each other; and the first outer periphery connection holes are arranged closer to the exhaust outlet side than the second outer peripher
    Type: Grant
    Filed: April 13, 2016
    Date of Patent: April 25, 2017
    Assignee: HONDA MOTOR CO., LTD.
    Inventor: Yoshitaka Hayama
  • Patent number: 9523304
    Abstract: An exhaust pipe that forms an exhaust flow channel includes a first flow channel member that forms part of the exhaust flow channel, and a second flow channel member connected in series with the first flow channel member, and forms part of the exhaust flow channel. A downstream-side end of the first flow channel member is inserted into an upstream-side end of the second flow channel member. A communication channel that communicates between an inside and an outside of the exhaust pipe is formed between an outer surface of an insertion part of the first flow channel member and an inner surface of an insertion-receiving part of the second flow channel member. The insertion-receiving part is arranged to face higher than a horizontal direction.
    Type: Grant
    Filed: February 5, 2014
    Date of Patent: December 20, 2016
    Assignee: FUTABA INDUSTRIAL CO., LTD.
    Inventors: Tomohiro Furuya, Toshio Yokota, Katsuhiko Kainuma
  • Patent number: 9482484
    Abstract: A firearm suppressor can comprise a central longitudinal chamber adapted to facilitate passage of a projectile fired from a firearm through the central longitudinal chamber. The firearm suppressor can also comprise an outer chamber disposed radially outward of the central longitudinal chamber, the outer chamber being in fluid communication with the central longitudinal chamber via an opening. The firearm suppressor can further comprise a baffle disposed in the outer chamber and defining a forward portion of the outer chamber and a rearward portion of the outer chamber. The forward portion of the outer chamber can contain the opening such that discharge gases associated with the projectile enter the forward portion of the chamber and are directed backward past the baffle to the rearward portion of the outer chamber where the discharge gases are at least temporarily trapped behind the projectile to reduce or prevent alteration of a trajectory or a speed of the projectile by the discharge gases.
    Type: Grant
    Filed: December 10, 2014
    Date of Patent: November 1, 2016
    Inventor: Anthony Barney
  • Patent number: 9423198
    Abstract: A firearm flash hider can include a base module and at least one vented flash control module. The base module can have a longitudinal boreline which is fluidly coupleable to a muzzle end of a firearm to allow a projectile to pass therethrough. The base module can also have an inlet port which is operable to receive at least a portion of a flash generated by firing the projectile. The vented flash control module can be arranged along the longitudinal boreline distal to the muzzle end. The vented flash control module can also have a flash chamber bounded by at least one wall that at least partially defines a geometry of the flash chamber and extends both radially and longitudinally from the boreline and translates circumferentially as it extends longitudinally. The flash chamber terminates at a circumferential angle of rotation from the inlet port where the circumferential angle of rotation being less than 180 degrees.
    Type: Grant
    Filed: October 17, 2014
    Date of Patent: August 23, 2016
    Assignee: OSS Suppressors LLC
    Inventor: Russell Oliver
  • Patent number: 9404499
    Abstract: A dual chamber discharge muffler for a compressor. The dual chambers of the discharge muffler are separated by a check valve that closes upon shutdown of the compressor, which in turn limits the amount of exhaust gases in the discharge muffler that are able to return to the compressor. The dual chambers are formed by dividing a muffler housing with a dividing plate. The dividing plate may also be adapted to receive a fastener that through mounts the muffler to the compressor.
    Type: Grant
    Filed: November 29, 2007
    Date of Patent: August 2, 2016
    Assignee: Emerson Climate Technologies, Inc.
    Inventors: Stephen M. Seibel, Christopher Stover, Roy J. Doepker
  • Patent number: 9341102
    Abstract: Embodiments in accordance with the present disclosure may provide a muffler comprising an enclosure. The enclosure, in one example, may include a relatively thin volume fittable under a preselected feature of a vehicle, and at least one relatively thick volume fittable alongside the preselected feature. The enclosure may also include an exhaust gas entry port and a tailpipe exit port. In one example, partitions may be within the thin volume forming an expansion chamber at the entry port and a tailpipe extension at the exit port.
    Type: Grant
    Filed: June 27, 2014
    Date of Patent: May 17, 2016
    Assignee: Ford Global Technologies, LLC
    Inventors: Brian Ross, Joel John Beltramo, Erich James Nowka, Kerry Timothy Havener
  • Patent number: 9228475
    Abstract: An exhaust silencing device connected to an exhaust system of an engine is provided in which two outlet pipes that have at an upstream end thereof an opening portion opening within the silencer main body and that discharge exhaust gas within the silencer main body to an outside thereof are disposed within the silencer main body along a bottom thereof so that the distances thereof from the lowest part of the bottom are substantially equal, and the opening portion of one outlet pipe is directed further toward the bottom of the silencer main body than is the opening portion of the other outlet pipe. Such exhaust silencing device efficiently discharges to the outside the condensed water building up within the silencer main body so as not to impair an effect in reducing exhaust resistance by providing two outlet pipes that guide the exhaust gas to the outside.
    Type: Grant
    Filed: August 27, 2012
    Date of Patent: January 5, 2016
    Assignees: Honda Motor Co., Ltd., Yutaka Giken Co., Ltd.
    Inventors: Teruaki Mukai, Jun Muto, Yasushi Kaneko
  • Patent number: 9212579
    Abstract: A muffler for a vehicle, may include a housing which defines a space therein, first and second baffles which partition the space inside the housing into first, second and third chambers, an inlet pipe which extends through the first baffle and the second baffle to be connected to the third chamber through the first chamber and the second chamber, an intermediate pipe which connects between the first and third chambers through the first baffle and the second baffle and has a plurality of holes in a portion thereof which may be placed in the second chamber, and an outlet pipe which sequentially extends through the first baffle and the second baffle from an first open end inside the first chamber, sequentially extends through the second baffle and the first baffle, sequentially extends through the first baffle and the second baffle, and then extends to the outside of the housing.
    Type: Grant
    Filed: August 18, 2014
    Date of Patent: December 15, 2015
    Assignee: Hyundai Motor Company
    Inventors: Hak Son Han, Seung Tae Kong
  • Patent number: 8978819
    Abstract: A spark arrestor mounted on a muffler connected to an exhaust pipe of an engine includes a cylindrical portion including an opening that extends therethrough from the outside to the inside thereof, two cap members that respectively close first and second ends of the cylindrical portion, a mesh portion that covers the opening, and a tail pipe extending from the inside to the outside of the cylindrical portion through the cap member, wherein the exhaust flows outside the cylindrical portion in a first direction, and a channel where the exhaust flows in a second direction opposite to the first direction is provided inside the cylindrical portion.
    Type: Grant
    Filed: January 8, 2014
    Date of Patent: March 17, 2015
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Hiroyuki Fujimoto, Kazuhiro Nishihara, Keishi Jouzaki
  • Patent number: 8844673
    Abstract: A muffler for an internal combustion engine includes an outer shell, an inlet pipe, an outlet pipe, and at least one constricted part. The at least one constricted part is provided in at least one of the inlet pipe and the outlet pipe on an open side thereof opening toward an inside of the outer shell. The at least one constricted part has a cross-sectional area smaller than a cross-sectional area of the at least one of the inlet pipe and the outlet pipe, which is provided with the at least one constricted part.
    Type: Grant
    Filed: February 1, 2011
    Date of Patent: September 30, 2014
    Assignee: Futaba Industrial Co., Ltd.
    Inventor: Katsuhiko Kainuma
  • Patent number: 8579077
    Abstract: A horizontally installed muffler may include a housing, first and second tail pipes installed to front and rear ends of the housing through the housing, an introduction chamber formed inside the housing and to which an outlet of the exhaust pipe is connected, a first intermediate pipe fluid-connected to the introduction chamber and having a first discharge hole, a discharge chamber fluid-connected to the introduction chamber through the first discharge hole of the first intermediate pipe, wherein each end of the first and second tail pipes and the first discharge hole are disposed inside the discharge chamber, first and second resonance chambers formed inside the housing, a second intermediate pipe fluid-connected to the first and second resonance chambers through the discharge chamber and the introduction chamber and having an introduction hole disposed inside the introduction chamber and a second discharge hole disposed inside the discharge chamber.
    Type: Grant
    Filed: June 4, 2012
    Date of Patent: November 12, 2013
    Assignee: Hyundai Motor Company
    Inventors: Hyeongyun Ahn, Hakson Han
  • Patent number: 8348013
    Abstract: An exhaust device of an internal combustion engine for reducing exhaust sound and for suppressing the occurrence of a torque valley. A sound-deadening and pressure-dissipating device connected to the downstream end of an exhaust pipe includes a spherical member having an opening portion opening toward a downstream edge of the exhaust pipe. Exhaust gas from the exhaust pipe is reflected by an inner spherical surface of the spherical member to reduce exhaust pressure in the spherical member and then is discharged from the opening portion.
    Type: Grant
    Filed: February 3, 2011
    Date of Patent: January 8, 2013
    Assignee: Honda Motor Co., Ltd.
    Inventors: Hisashi Uneta, Taichi Honda, Tomoya Matsuo, Yoshihisa Hirano
  • Patent number: 8302732
    Abstract: A silencer, particularly rear silencer, for an exhaust system of a combustion engine, particularly of a motor vehicle, has a housing in which an outlet chamber is located. An outlet pipe arrangement leads out of the housing which on the inlet side is fluidically connected to the outlet chamber. A particularly compact design can be realized if the outlet pipe arrangement is configured as pipe-in-pipe arrangement including at least one deflection pipe closed on one side and arranged in the housing and an outlet pipe led out of the housing.
    Type: Grant
    Filed: February 16, 2011
    Date of Patent: November 6, 2012
    Assignee: J. Eberspaecher GmbH & Co. KG
    Inventors: Peter Gorke, Michael Pommerer
  • Patent number: 8205710
    Abstract: A belt-type continuously variable transmission that prevents escape of noise generated by a resin block belt to the outside. The resin block belt is wound around a primary sheave and a secondary sheave. A transmission case defines a belt chamber accommodating the primary sheave, secondary sheave, and resin block belt. The transmission case includes an exhaust passage, intake passages, and a sound absorbing member. The sound absorbing member is attached to an inner wall of the exhaust passage in a position to collide with sound waves traveling through the exhaust passage. The sound absorbing member has a sound absorbing surface crossing an extending direction of the exhaust passage.
    Type: Grant
    Filed: January 22, 2008
    Date of Patent: June 26, 2012
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventor: Yousuke Ishida
  • Patent number: 8047328
    Abstract: A muffler adapted for connection with an exhaust pipe of an internal combustion engine which has an outer housing constructed of a plastic material. The housing has an inlet and at least one inwardly protruding rib extends around the interior of the housing inlet. The rib is constructed of a plastic material and forms an opening complementary in shape, but smaller in cross-sectional area, than the outer periphery of the exhaust pipe. The exhaust pipe is inserted into the inlet and the exhaust pipe and housing are vibrated relative to each other for a time period sufficient to at least partially melt the rib and cause the rib to seal around the exhaust pipe upon cooling.
    Type: Grant
    Filed: October 13, 2010
    Date of Patent: November 1, 2011
    Inventors: Mark Milewicz, Colin Murdock Drewek
  • Patent number: 8011471
    Abstract: The exhaust chamber for a motor vehicle exhaust line includes: a main envelope defining a main enclosure and having an exhaust gas inlet and an exhaust gas outlet; and at least one saucer-shaped shell having an opening defined by a peripheral edge of the shell, the or each shell being tightly connected to an outside surface of the main envelope along the peripheral edge, the shell, with the main envelope, defining a secondary enclosure. The main envelope has, beneath the shell, a plurality of perforations for placing the main enclosure in communication with the secondary enclosure. The main envelope has, in a first area located beneath the shell, at least one slot for increasing the elasticity of the first area, and/or the main envelope has, in a second area that is not covered by the shell, at least one rib for increasing the stiffness of the second area.
    Type: Grant
    Filed: May 26, 2008
    Date of Patent: September 6, 2011
    Assignee: Faurecia Systemes d'Echappement
    Inventor: Jian Zheng
  • Patent number: 7918310
    Abstract: A noise attenuation device for testing a jet engine.
    Type: Grant
    Filed: September 2, 2009
    Date of Patent: April 5, 2011
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Norman L. Helgeson, Steven Fann
  • Publication number: 20100270103
    Abstract: A muffler for reducing the sounds of combustion gases exhausted from an internal combustion engine including an elongated fluid passage extending between an inlet and an outlet such that the outlet is in fluid communication with the inlet. Further, the inlet being connectable with the gases exhausted from the engine and the outlet being connectable with the atmosphere. The muffler further including an outer tank surrounding the passage and a tubular connector having a first end in fluid connection with the passage and a second end in fluid connection with the tank such that the connector produces a fluid connection between the passage and the tank. The connectors having a perforated resistance plate to restrict the fluid flow between said passage and said sound chamber thereby reducing the severity of the sound or fluid pulses entering and exiting said sound chamber, perforations in said perforated plate forming an open portion of said plate and said open portion being less than 60 percent.
    Type: Application
    Filed: March 1, 2010
    Publication date: October 28, 2010
    Inventors: Ronald G. Huff, Keith Skowronski, Mark Bockwich
  • Patent number: 7753168
    Abstract: A muffler has a casing with a plurality of sound-muffling chambers, exhaust pipes that pass through at least two sound-muffling chambers and to pass through exhaust from an engine, a plurality of apertures provided in each exhaust pipe, and a plurality of valves provided in each of the apertures. In this muffler, the plurality of apertures are provided at the locations at which an exhaust flow from one aperture and an exhaust flow from another aperture do not interfere with each other. When there are two apertures, the apertures are provided at positions in the exhaust pipes at which the apertures do not face each other. For this reason, by avoiding interference between exhaust flows from the two apertures, it is possible to suppress an abnormal sound caused by the interference.
    Type: Grant
    Filed: May 16, 2007
    Date of Patent: July 13, 2010
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Takeshi Hara, Hideyuki Komitsu, Masayuki Sudo
  • Patent number: 7712578
    Abstract: A muffler includes a case divided into three chambers by two baffles. The first chamber is closest to, and the third chamber is farthest from, the exhaust pipe. An inlet pipe has a first end connected to the exhaust pipe, and a second end in fluid communication with the third chamber. An outlet pipe expels exhaust and water from the first chamber to the exterior. A connecting pipe provides fluid communication between the first and third chambers. The second end of the inlet pipe is above the bottom interior surface of the outlet pipe. The inlet pipe may have holes in the second chamber, above the bottom interior surface of the outlet pipe. The connecting pipe may have holes in the second chamber. The baffles may have holes for the water to flow from the second and third chambers to the first chamber. Also, an exhaust apparatus utilizing the muffler.
    Type: Grant
    Filed: July 9, 2008
    Date of Patent: May 11, 2010
    Assignee: Hyundai Motor Company
    Inventor: Hakson Han
  • Patent number: 7637349
    Abstract: An exhaust system for a motorcycle provides enhanced steering stability and improved function for purifying exhaust gas. Front exhaust pipes connected with front cylinders of a V-type engine are joined to a front part of an exhaust chamber. Rear exhaust pipes connected with rear cylinders of the engine are joined to an upper part of the exhaust chamber. Exhaust gases discharged from both the front and rear exhaust pipes are unified within the exhaust chamber, and a catalyst is disposed in the vicinity of the unifying section. The length of the rear exhaust pipes is shorter than the length of the front exhaust pipes. High-temperature exhaust gas is introduced to the catalyst contained within the exhaust chamber via the rear exhaust pipes.
    Type: Grant
    Filed: October 3, 2006
    Date of Patent: December 29, 2009
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventor: Keiichi Harada
  • Publication number: 20090014237
    Abstract: A muffler for reducing the sounds of combustion gases exhausted from an internal combustion engine. The muffler including an elongated fluid passage extending between an inlet and an outlet such that the outlet is in fluid communication with the inlet. The inlet of the muffler being connectable with the gases exhausted from the engine and the outlet being connectable with the atmosphere. The passage having a first side region and a second side region circumferentially spaced from the first region with a fluid passage in at least one of the first and second side regions. The muffler further including a side attenuation sound chamber adjacent the at least one of the side regions wherein the chamber is circumferentially spaced from the other of the at least one side region.
    Type: Application
    Filed: July 9, 2008
    Publication date: January 15, 2009
    Inventors: Keith Skowronski, Mark Bockwich, Ronald G. Huff
  • Publication number: 20090014238
    Abstract: A muffler for reducing the sounds of combustion gases exhausted from an internal combustion engine including an elongated fluid passage extending between an inlet and an outlet such that the outlet is in fluid communication with the inlet. Further, the inlet being connectable with the gases exhausted from the engine and the outlet being connectable with the atmosphere. The muffler further including an outer tank surrounding the passage and a tubular connector having a first end in fluid connection with the passage and a second end in fluid connection with the tank such that the connector produces a fluid connection between the passage and the tank.
    Type: Application
    Filed: July 9, 2008
    Publication date: January 15, 2009
    Inventors: Ronald G. Huff, Keith Skowronski, Mark Bockwich
  • Patent number: 7407036
    Abstract: To provide a muffler for a compact combustion engine, which is simple in structure and effective to sufficiently reduce the temperature of exhaust gases while avoiding contact with an external air, an exhaust guide passage 7 for communicating the exhaust gases (G) to a discharge port (63) is provided within an interior hollow of a muffler housing 6 defining an exhaust chamber (61) therein, and a side wall of this exhaust guide passage (7) is constituted by a portion (6W) of the muffler housing (6) and a duct wall (71) jointed to the muffler housing (6).
    Type: Grant
    Filed: April 26, 2005
    Date of Patent: August 5, 2008
    Assignee: Kawasaki Jukogyo Kabushiki Kaisha
    Inventors: Masanori Kobayashi, Tsuneyoshi Yuasa
  • Patent number: 7389853
    Abstract: A muffler suited for use in discharging exhaust gas from an engine. The muffler generally includes a housing that defines a muffler interior, an inlet aperture, and an outlet aperture. A baffle that defines a baffle interior is positioned to divide the muffler interior into an inlet space and an intermediate space. A first aperture is defined within the baffle to provide fluid communication between the inlet space and the intermediate space and a second aperture is formed within the baffle to provide for fluid communication between the intermediate space and the baffle interior. A flow guide is integrally formed with the baffle and is positioned to direct exhaust gas from the baffle interior through the outlet aperture.
    Type: Grant
    Filed: May 24, 2004
    Date of Patent: June 24, 2008
    Assignee: Briggs & Stratton Corporation
    Inventors: Stephen J. Ryczek, James D. Makiya, William M. Kindness, Kyle Clasen
  • Patent number: 7380637
    Abstract: The invention is directed to an exhaust-gas muffler (1) of a handheld work apparatus driven by an internal combustion engine. The exhaust-gas muffler (1) includes a muffler housing (2) which includes an engine-end wall (3) having an inlet window (4) as well as an outlet (5). Attachment means (6) for fixing the exhaust-gas muffler (1) on the internal combustion engine are provided on the engine-end wall (3) in the region of the inlet window (4). The engine-end wall (3) is provided with a reinforcing sheet metal piece (7) on the inner side of the exhaust-gas muffler (1) in the region of the attachment device (6). A discharge channel (8), which leads to the outlet (5), is formed at least between a part region of the reinforcing sheet metal piece (7) and the adjoining region of the muffler housing (2).
    Type: Grant
    Filed: December 17, 2004
    Date of Patent: June 3, 2008
    Assignee: Andreas Stihl AG & Co. KG
    Inventors: Guilherme Pizzato Sieben, Ralf Blechschmidt, Helmut Schlessmann
  • Patent number: 7174991
    Abstract: The subject invention refers to a muffler comprising a muffler housing (1, 2) and generally a catalytic converter element (13) mounted in the housing, which muffler has at least one inner outlet (4) through which exhaust gases cleaned by the catalytic element (13) are intended to pass. Furthermore, according to the invention an outlet duct (30, 31) is arranged in connection to the outside of the housing, comprising a first section (30) for leading exhaust gases in a first direction (A) in parallel with the outside of the housing, and a second section (31) for leading exhaust gases in a second, opposite direction (B), whereby said first and second sections (30, 31) have an essentially equally large cross-sectional area. By way of this outlet duct an improved cooling of the exhaust gases before they are brought in contact with fresh air rich in oxygen can be achieved. A back-pulsation of fresh air into the muffler can also be prevented.
    Type: Grant
    Filed: November 3, 2000
    Date of Patent: February 13, 2007
    Assignee: Aktiebolaget Electrolux
    Inventors: Peter Gunnarsson, Esbjörn Ollas, Mattias Ossiansson
  • Patent number: 6973959
    Abstract: A heat exchanger for cooling motor vehicle exhaust gases, which heat exchanger is to be fitted into an exhaust line of the vehicle and having at least three tubes in contact by way of their outer walls with cooling air, in which the exhaust gases are brought to circulate.
    Type: Grant
    Filed: November 21, 2000
    Date of Patent: December 13, 2005
    Assignee: Peugeot Citroen Automobiles SA
    Inventors: Patrick Claverie, Arnaud Vitel
  • Patent number: 6802388
    Abstract: The invention relates to a silencer (1) for noise-laden gas pipes, especially for a suction pipe and/or an exhaust pipe of an internal combustion engine, comprising an outer pipe (2) with an inlet side (3) and an outlet side (4), a plurality of diaphragm rings (9, 9′, 9″, ′″, 9″″) each with an outer surface connected (5) to the inner surface of the outer pipe (2), at least one insert (6) with an outer surface connected (7) to the inner surface of the outer pipe (2) and/or the diaphragm rings (9, 9′, 9″, 9′″, 9″″) and with a plurality of openings (8) which are closed on one side. Said insert (6) forms sub-pipes for the gas flow in the silencer, and the openings (8), which are closed on one side, open into the sub-pipes, the depth thereof being /4 in relation to the wavelength of a frequency to be silenced.
    Type: Grant
    Filed: February 13, 2003
    Date of Patent: October 12, 2004
    Assignee: WOCO Franz-Josef Wolf & Co. GmbH
    Inventors: Franz Josef Wolf, Udo Gärtner, Josef Hohmann, Anton Wolf
  • Patent number: 6745863
    Abstract: The present invention relates to an improvement in an exhaust system structure for a motorcycle. A motorcycle has an engine disposed between front and rear wheels, an exhaust pipe extending from the engine, and a silencer connected to the exhaust pipe for discharging exhaust gases. The silencer, which is a heavy object, is of the type having a gas outlet disposed near a gas inlet. The silencer is disposed below the engine with the gas inlet facing toward the rear wheel, and the exhaust pipe extends to a position near the rear wheel and is connected to the gas inlet of the silencer. By elongating the length of the exhaust pipe and placing the silencer under the engine, the exhaust system performs sufficiently with high output engines, while at the same time lowers the center of gravity of a motorcycle body and balances the weight of the motorcycle body in its longitudinal direction.
    Type: Grant
    Filed: March 28, 2002
    Date of Patent: June 8, 2004
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Hiroaki Tsukui, Takao Mikami, Eiichi Kanda, Shin Watanabe, Shin Sato
  • Patent number: 6672425
    Abstract: The current invention is device for lowering the air velocity and inherent noise of high-speed air released from a closed system, comprising a straight pipe module with an outer tube and a concentric inner tube creating an annular space therebetween. The inner tube has interior fins at the inlet, which initiate rotation in an airflow directed therethrough, and interior fins at the outlet, which arrest the airflow rotation. Perforations along the length of the inner tube, from inlet fins to outlet fins, permit the release of a turbulent outer zone of the airflow, permitting the high velocity core of the airflow to expand and slow, reducing the noise of the airflow.
    Type: Grant
    Filed: July 24, 2002
    Date of Patent: January 6, 2004
    Assignee: Onyx Industrial Services, Inc.
    Inventor: Clint B. Simmons
  • Patent number: 6629580
    Abstract: The invention relates to a device in a silencer unit of an automotive vehicle, for suppressing unwanted noise originating from an exhaust gas flow from the vehicle engine, said silencer unit being terminated by an end pipe, through which said exhaust gas flow is conveyed to the surroundings. The invention is characterized by the end pipe comprising at least one perforated section having a predetermined extension (L2) in the longitudinal direction of the end pipe, and being positioned downstream of a point (L3) along the end pipe where there is substantially no turbulence in the exhaust flow. Through the invention, an improved silencer unit is provided, with which predetermined requirements for comfort directed low-frequency suppression of the exhaust flow noise, as well as statutory requirements for high-frequency absorption of the noise, are fulfilled.
    Type: Grant
    Filed: June 30, 2001
    Date of Patent: October 7, 2003
    Assignee: Volvo Personvagnar AB
    Inventors: Ulf Nilsson, Pekka Saviharju, Per-Ola Petersson
  • Patent number: 6571911
    Abstract: A muffler including a long outlet pipe 20 having an exhaust gas inlet pipe portion 21, a return pipe portion 22, an exhaust gas outlet pipe portion 23, and two turnaround pipes 24, 25 for connecting the three pipe portions 21, 22, 23 together in series. These pipe portions 21, 22, 23 are arranged in parallel with one another along a longitudinal direction of a shell 2, and in such a manner that longitudinal axes 21L, 22L, 23L of the pipe portions are positioned at respective vertices of a triangle.
    Type: Grant
    Filed: September 21, 2001
    Date of Patent: June 3, 2003
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Satoshi Watanabe, Shigeru Furudate, Tsuyoshi Ishii
  • Patent number: 6510921
    Abstract: A muffler has an elongated generally cylindrical casing having inlet and outlet ends, an elongated generally frustroconical baffle in the casing adjacent the inlet end with the smaller diameter portion being spaced from the inlet end. The peripheral wall of the baffle has closely spaced perforations over the major portion of its axial length and is spaced from the shell to provide a chamber thereabout. A generally cylindrical baffle has one end extending over the smaller diameter portion of the frustroconical baffle and has its peripheral wall spaced from the casing to provide a chamber thereabout. The peripheral wall of the cylindrical baffle has closely spaced perforations over most of its length. Exhaust gases enter the frustroconical baffle and exit through the perforations therein, move axially in the casing thereabout, and then pass through the apertures into the cylindrical baffle.
    Type: Grant
    Filed: February 19, 2001
    Date of Patent: January 28, 2003
    Assignee: Samson Motorcycle Products, Inc.
    Inventor: Kenneth E. Price
  • Patent number: 6470998
    Abstract: A modular muffler that is quickly and easily adapted for use with a wide variety engines is disclosed. The muffler has a dimensionally standardized body member with end portions that may receive any of a number of adaptor end plates provided with various inlet and outlet configurations. The adaptor end plates are inwardly and outwardly adjustable relative to the body member end portions in order to vary the body member internal volume.
    Type: Grant
    Filed: October 26, 2000
    Date of Patent: October 29, 2002
    Inventor: James E. White
  • Patent number: 6443255
    Abstract: A muffler for use with high performance powerboats to reduce exhaust noise to below 90 decibels without significantly reducing horsepower is described. The muffler includes a cylindrical outer housing with an interior cavity that is divided into first and second chambers by parallel intake and discharge cylinders. The intake cylinder has intake and discharge ends, and inwardly directed louvers toward the intake cylinder discharge end. The abutting discharge cylinder has inner and discharge ends, with inwardly directed louvers toward the discharge cylinder inner end. A first plate extends across the interior cavity of the housing, blocking the inner end of the discharge cylinder, with the intake end of the intake cylinder extending through a hole in the first plate. A second plate extends across the interior cavity of the housing, and includes a hole in communication with the discharge end of the discharge cylinder.
    Type: Grant
    Filed: December 8, 2000
    Date of Patent: September 3, 2002
    Assignee: Fountain Powerboats, Inc.
    Inventor: Richard William Shavender, Jr.
  • Patent number: 6435302
    Abstract: A motor vehicle muffler having a muffler loop installed in a casing in the exhaust pipe of a motor vehicle, the muffler loop formed of three muffler tubes and two connecting tubes, the muffler tubes being arranged at different elevations in the casing and crossed by one another at the same point, the connecting tubes being arranged in parallel outside the casing to connect the muffler tubes in series.
    Type: Grant
    Filed: December 21, 2000
    Date of Patent: August 20, 2002
    Inventor: Shun-Lai Chen
  • Patent number: 6427802
    Abstract: A muffler in which in order to reduce a harsh high-frequency component exhaust noise as exhaust noise of a vehicle, and relieve a feeling of discomfort due to the exhaust noise, on at least one of an inner plate and an outer plate, a plurality of dot-shaped convex portions 15 and dot-shaped concave portions 16 are provided, and the convex portions 15 and concave portions 16 are alternately arranged to be surrounded with each other. Furthermore, the convex portion 15 is connected to the concave portion 16 by a curved surface.
    Type: Grant
    Filed: November 24, 2000
    Date of Patent: August 6, 2002
    Assignee: Sango Co., Ltd.
    Inventors: Masayuki Yokoi, Masahiro Maeno, Masayoshi Tange
  • Patent number: 6394225
    Abstract: To provide a muffler structure capable of lowering muffler cost. A muffler structure is provided in which a sound absorbing material is laid on the inside surface of an outer tube. The sound absorbing material is retained by an inner tube made of a metal that is punched with a plurality of holes. The inner tube is divided into a plurality of expansion chambers. Exhaust gas from an engine is led into the fiat expansion chamber by an inlet pipe. The exhaust gas is discharged out after being supplied to the second and third expansion chambers in succession through the connecting pipes. In the muffler structure, the inner tube is made of an approximately flat metal that is punched with a plurality of holes by bending the metal into circular form until its opposite edges are butted to each other, and is fitted in the outer tube, with the butt portions not jointed, so that the butt portions will come behind the connecting pipe when viewed from the inlet pipe side.
    Type: Grant
    Filed: October 19, 2000
    Date of Patent: May 28, 2002
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventor: Kazuhiro Yasuda