Abstract: An exhaust gas exhausted from a fuel cell is sent to a silencer through an exhaust pipe. The silencer is provided with a conductive noise absorbing material, and is fixed to a vehicle body through a metallic fixing jig. Thus, the noise absorbing material is earthed to the vehicle body so that it is possible to prevent static electricity from being generated in the use of the fuel cell vehicle such as in a low humidity environment.

Abstract: A high-performance muffler assembly for exhaust system of an internal combustion engine. The muffler assembly comprises an elongated casing having an inlet port and an exit port, a first pipe disposed within the casing and having an inlet end in fluid communication with the inlet port and an outlet end selectively fluidly connected to the exit port of the casing, and a first valve mounted within the casing. The first valve is selectively movable between a closed position and an open position for regulating an exhaust gas flow through the first pipe. The muffler assembly is operable in a number of different modes of operation including a high-performance mode, an exhaust braking mode, a reverse-flow mode, etc., determined by the positions of the first valve of the muffler assembly.

Abstract: A device, method of making, and method of using, illustratively wherein a container includes an inlet and an outlet; a catalytic converter intermediate in a path between the inlet and the outlet; at least one surface arranged to ensure at least a majority of gas received from the inlet traverses a first portion of the path from the inlet to the catalytic converter and communicates heat from the catalytic converter to the container; and an optical indicator arranged to indicate outside the container whether the catalytic converter is operating inside the container to reduce concentration of a smog-generating chemical with respect to the gas.

Abstract: An arrangement of parts having a first part in the form of sheet metal which is in contact with the second part along an edge and is fixedly connected to the second part via at least one weld. To reduce stress peaks at the ends of welds, the first part has a slot in a section adjacent to the respective end of the weld, the slot beginning at the edge and extending to its end with a curved profile a curve bent by at least 180° up to its end.

Abstract: An exhaust system for an engine includes a first muffler having a housing, a first end plate, a second end plate, an inlet pipe extending through at least one of the first end plate and the second end plate, and an outlet pipe extending through at least one of the first end plate and the second end plate. The exhaust system further includes a second muffler having a housing, a first end plate, a second end plate, an inlet pipe extending through at least one of the first end plate and the second end plate, and an outlet pipe extending through at least one of the first end plate and the second end plate. The exhaust system further includes a crossbreed pipe extending through the first end plate of the first muffler and the first end plate of the second muffler.

Abstract: An exhaust system for an electric power generation system is disclosed. The exhaust system may include a muffler configured to suppress noise associated with operation of an engine associated with the electric power generation system. The muffler may be configured to be mounted in a roof of a housing configured to contain at least part of the electric power generation system. The muffler may be configured to form an outside surface of the roof. Removal of the engine from the housing may be facilitated by removal of the muffler from the roof, such that the engine can be lifted out of the housing.

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.

Abstract: An exhaust-gas muffler (1) has a housing (2) through which at least one sleeve (11) projects. At one end, the sleeve (11) has an attachment opening (10) and at the opposite-lying end has an access opening (14). To avoid a contamination of the sleeve (11) during operation, a plug (15, 25, 35, 40, 45, 55) of a pressed metal wire is arranged in the access opening (14).

Abstract: An exhaust system for an engine that reduces muffler weight, assures a silencing effect and prevents a leak of exhaust gas. A muffler has an inner cylinder disposed in an outer cylinder, and is separated into a plurality of expansion chambers. A communicative passage for communicatively connecting the expansion chambers together is formed between the outer and inner cylinders. Edge parts of the communicative passage contact the outer cylinder and are welded thereto.

Abstract: A flow-through muffler includes a plurality of heat conducting walls, baffles, or partitions that together define a plurality of passages arranged to form acoustic waveguides, attenuators, and/or cancellation chambers, the walls, baffles, or partitions increasing a surface area exposed to the exhaust gases to facilitate extraction of heat while attenuating or canceling the resulting sound pressure waves. The muffler may have a cooling arrangement mounted thereon, and thermoelectric generator elements or other heat-powered device, such as a reformer, connected across the heat differential between the cooling arrangement and an exterior surface of the muffler housing that is in thermal contact with the heat conducting walls, bafflers, or partitions. In addition, the muffler may be made tuneable by providing a device for varying a length of one of the passages relative to another passage, and by including a sound cancellation chamber at an intersection of the passages.

Abstract: In an exhaust system of a motor vehicle, a tailpipe cover is disposed on the exhaust pipe and protrudes through a cutout in the vehicle rear part with a defined gap clearance. In a hot condition, where a length of the exhaust system is increased due to thermal expansion, a greater clearance arises between the edge of the cutout and the tailpipe cover than in the cold condition. The tailpipe cover is trumpet cone shaped.

Abstract: An engine room for construction equipment is provided, which can minimize emission of noise generated in an engine room due to driving of an engine and a ventilating fan to an outside of the engine room by absorbing the noise through a noise trap, and can improve the cooling performance of corresponding components by smoothing inhalation/discharge of an external air to/from the airtight engine room.

Abstract: A device for influencing an exhaust gas flow, in particular for controlling the sound emission in an exhaust branch of an engine, includes a closure member that is movably arranged in the exhaust gas flow. For example, the closure member comprises a flap driven by a motor to move the closure member in the exhaust gas flow. It is thus optionally possible to produce or influence pressure pulsations in the exhaust gas which lead to an audible sound emission. The device according to the invention provides for a so-called “sound design” of a combustion engine. The driving device (the drive motor and a force transmission member to the closure member) is equipped with an active cooling system.

Abstract: An exhaust pipe for an internal combustion engine includes an inner tube carrying a flow of exhaust gas and surrounded by an outer tube, with an insulating layer disposed between the inner tube and the outer tube. The inner tube has at least one region formed with a nub-shaped profile in contact with the flow of exhaust gas.

Abstract: A system for reducing an acoustic load of a fluid flow includes a first pipe to carry the fluid flow; a standpipe connected to the first pipe at an opening in the first pipe; and a standpipe flow tripper provided in the standpipe. The flow tripper includes an edge extending through the opening into the flow on a downstream side of the opening. A method of reducing an acoustic load of a standing wave in a standpipe connected to a first pipe configured to carry a flow includes disrupting the flow in the first pipe at a downstream side of an opening in the first pipe to which the standpipe is connected.

Abstract: A turbine engine resonator comprising a panel and a vessel. The panel is along a flow path within the engine and has an aperture. The vessel has a mounting flange secured to the panel. The flange has an aperture mated to the aperture of the panel. The vessel has a body secured to the mounting flange with an interior of the body in communication with the flange aperture. A first portion of the panel extends into the mounting flange aperture and may redirect a leakage flow, if any, to limit an effect of leakage upon resonator performance.

Abstract: A pulsation dampener for receiving a fluid medium containing pressure pulsations. The pulsation dampener can include a body having an inner surface, an inlet, and an outlet, and a fluid path defined at least partially by the inner surface of the body. The fluid path can include a first chamber in fluid communication with the inlet and having a first cross-sectional area, a second chamber positioned adjacent the first chamber and having a second cross-sectional area different from the first cross-sectional area, and a third chamber in fluid communication with the outlet and positioned adjacent the second chamber opposite the first chamber and having a third cross-sectional area different from the second cross-sectional area. The fluid path can be configured such that the second cross-sectional area is greater than the first cross-sectional area and the third cross-sectional area.

Abstract: A muffler includes a shell main that is formed in a cylinder with two openings opposite to each other being apart from each other in an axial direction of the shell main body by rolling a flat plate to have an overlapped portion overlapping an inner end portion and a shell portion, and a pair of end plates that are partially inserted in the openings of the shell main body and fixed to the shell main body. The inner end portion is formed with two cut-off portions at opening-side edges of the inner end portion, respectively, to avoid interference between the inner end portion and the end plates when the end plates are inserted into the openings of the shell main body.

Abstract: 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 member and a second member where the second member includes a plurality of openings therethrough with each hole having a counter-bore on its upstream side. The first member has a size substantially smaller than the diameter of said flow path and a first plurality of openings therethrough. The openings are in fluid communication with the flow path. The second member has a size generally equal to the first member and a second plurality of openings therethrough, which openings are in fluid communication with the flow path.

Abstract: The exhaust muffler includes a flat box-shaped body that underlies substantially the width of the motorcycle engine and frame. The rear end of the muffler body has exhaust vents that vent the exhaust downward or laterally from the motorcycle forward of the rear wheel. An inlet neck extending from the front end of the muffle body allows convenient and direct connection of the exhaust pipes from the motor to the muffler body without numerous or complicated bends in the exhaust pipers. The low profile of the muffle body allows the exhaust muffler to be mounted beneath the motorcycle frame without significantly effecting ground clearance.

Abstract: A silencer with a casing and at least one inlet passage for leading gas into said casing, and at least one outlet opening for leading gas out of said casing, said silencer containing at least one acoustic chamber contained in the casing, at least one porous body inside said chamber, the porous body comprising a through-flow filter occupying at least part of the chamber, where said at least one porous body is designed to retain particles contained in the gas, at least one connecting passage for leading gas from each one of the at least one acoustic chamber to another of the at least one acoustic chamber or to an exterior environment or an exterior chamber, wherein at least part of at least one of said connecting passages extends along an outer surface of the porous body, so as to lead gas along a helical flow path.

Abstract: A compressor muffler includes a housing having an inlet end and an outlet end. A baffle arrangement extends from an interior surface of the housing. The baffle arrangement includes a surface capable of reflecting compressed fluid to attenuate noise. A valve assembly is disposed inside the baffle arrangement. The valve assembly is positionable between a first position and a second position. The valve assembly also includes a valve surface that at least partially prevents flow of fluid through the housing from the outlet end when the valve assembly is in the first position.

Abstract: A passive valve assembly for a vehicle exhaust system includes an exhaust component that defines an exhaust gas flow path and a vane that is positioned within the exhaust gas flow path. The vane is movable between a fully closed position where a maximum portion of the exhaust gas flow path is blocked by the vane and a fully open position where a minimum portion of the exhaust gas flow path is blocked by the vane. The closed position comprises a start position for the passive valve assembly when there is no exhaust gas flow. The vane is obliquely orientated to a plane that is perpendicular to a centerline of the exhaust component when the vane is in the start position.

Abstract: A passive valve assembly for an exhaust component includes a vane that is positioned within an exhaust gas flow path. The vane is pivoted from a closed position to an open position in response to exhaust gas flow overcoming a biasing force. A stop is positioned within the exhaust component and cooperates with the vane to define a closed position for the vane.

Abstract: The present invention is directed to an improved dual phase muffler for the abatement of reduction of sound and emission pollutants such as hydrocarbons, carbon monoxide, and nitrogen oxides. More specifically, the muffler comprises a muffler casing, an inner chamber formed in the muffler, and a catalytically coated supported material contained within the inner chamber. The present invention is also directed to a catalytically coated metallic foam catalyst support, which optionally can be pre-coat with a metallic thermal arc sprayed layer.

Abstract: A vehicle exhaust assembly for improved evacuation of exhaust gases from an internal combustion engine. The system comprises a modular replacement exhaust system having a novel header pipe and muffler. The present invention readily adapts to a range of vehicle applications including automobiles, motorcycles, and all terrain vehicles.

Abstract: An air filtering device for protection suits includes a case in which a fan unit is received and a filtering unit is engaged with a hole in a wall of the case and located outside of the case. A duct of the fan unit extends through a top of the case and is in communication with a muffler connected on the top of the case. A hose is connected with an aperture of the muffler. The fan unit can be driven by AC or DC power and the noise from the fan unit can be reduced by the muffler.

Abstract: An exhaust system for a motorcycle engine includes a muffler assembly. The muffler assembly includes a downstream attenuation portion adapted to be positioned substantially rearward of the motorcycle engine and having a first height, an upstream portion adapted to be positioned substantially forward of the motorcycle engine and having a second height, and an intermediate attenuation portion between the upstream portion and the downstream attenuation portion. The intermediate attenuation portion is adapted to be positioned substantially below the motorcycle engine and has a third height less than half the first height. In some embodiments, a motorcycle is provided, in which the motorcycle engine is positioned substantially within a recess of the muffler assembly to a depth greater than the third height.

Abstract: A high-performance exhaust silencer in which a shell wall includes a shell outer plate, a shell inner plate, and a damping material to be inserted therebetween. A space between the shell outer plate and shell inner plate of the exhaust silencer is narrowed and the shell outer plate and the shell inner plate will not interfere with each other. An outer shape of the exhaust silencer is small but the expansion chambers are large by providing an air space between the shell outer plate and the shell inner plate. For the above-mentioned damping material, a material obtained by stretchably weaving metal wire into mesh is used.

Abstract: A diaphragm muffler for quiet operation of a compressor imparting an above atmospheric pressure stream and a below atmospheric pressure stream. The diaphragm muffler including a diaphragm pressure chamber receiving the above atmospheric pressure stream; a diaphragm vacuum chamber receiving the below atmospheric pressure stream; and a flexible diaphragm dividing the diaphragm pressure chamber receiving the above atmospheric pressure stream from the diaphragm vacuum chamber receiving the below atmospheric pressure stream, whereby the above atmospheric pressure stream and the below atmospheric pressure stream cancel each other out via the flexible diaphragm.

Abstract: Aspects of the invention are directed to a system for improving the damping performance of an acoustic resonator. According to aspects of the invention, a resonator, such as a Helmholtz resonator, can be attached to a surface of a combustor component in a turbine engine. The combustor component includes a region in which a plurality of passages extend through the thickness of the component. The resonator is attached to the component so as to enclose at least some of the passages. The passages are in fluid communication with a cavity defined between the component surface and the resonator. Resonator performance is a function of the length of the passages in the component. According to aspects of the invention, resonator performance can be improved by reducing the length of the passages in the component by reducing the thickness of the component in a region that includes the plurality of passages.

Abstract: This fuel cell system is provided with: a fuel cell which is supplied with cathode gas and anode gas and generates electrical power; a discharged gas processing device which mixes and dilutes cathode off-gas and anode off-gas discharged from the fuel cell; a discharge gas pipe through which exhaust gas discharged from the discharged gas processing device flows; a specific gas concentration sensor disposed in the discharge gas pipe, which measures a concentration of a specific gas in the exhaust gas; and an enlarged cross-section area flow path section provided between the discharged gas processing device and the specific gas concentration sensor, and having a flow path cross-section area that is larger than that of the discharge gas pipe.

Abstract: Acoustic muffler for a hermetic compressor, comprising: a hollow base; a cover to be coupled to the hollow base, said parts of hollow base and cover including respective peripheral flanges to be mutually seated according to a seating plane; and a retention means, attaching the hollow base to the cover at the junction of said peripheral flanges, each peripheral flange presenting a respective seating surface provided with at least one recess and one rib radially adjacent and which are shaped to respectively complement one rib and one recess of the seating surface of the other peripheral flange, each rib and recess being continuous and provided to define a locking between the parts of hollow base and cover against relative spacing apart movements in said seating plane, and to define continuous sealing radial labyrinths between the interior and the exterior of the acoustic muffler, at the junction of said peripheral flanges.

Abstract: An exhaust device includes an exhaust pipe connected at its upstream end to a cylinder head of the engine and an exhaust muffler connected to the downstream end of the exhaust pipe for suppressing the generation of noise from a heat insulating cover that covers a part of the exhaust pipe. A heat insulating cover covers a portion of the exhaust pipe near the engine and a stay is fixed to the heat insulating cover. The stay includes a supporting plate portion curved so as to partially surround the outer circumference of the exhaust pipe. A first vibration isolating member is provided that is sandwiched between the outer circumference of the exhaust pipe and the supporting plate portion, a band member is tightened to mount the supporting plate portion to the exhaust pipe, and a second vibration isolating member is sandwiched between the supporting plate portion and the band member.

Abstract: A vehicle muffler, which is structured in a coiled fashion, has a tube extending through the circumferential wall. This tube is welded to the circumferential wall and fastened by mechanical deformation to a support wall of an inner insert piece.

Abstract: A silencer that reduces a noise from a noise source in a first housing that houses the noise source in a first internal space includes a second housing that houses the noise source in a second internal space, and is provided in the first internal space of the first housing, and a connector that is provided in the second housing and connects the first internal space to the second internal space, a space inside the first internal space but outside the second internal space being used to reduce the noise and wider than the second space.

Abstract: The present invention provides an assembly comprising a compressor housing and EGR mixer, the assembly further comprising a ported shroud in the compressor housing and a noise suppressor in the EGR mixer.

Abstract: An engine-driven work machine is provided in which an engine/work machine unit (5) and an exhaust muffler (23) are housed in a box (30), the box (30) is provided with a cooling air passage (44) that passes the area around the engine/work machine unit (5) and the exhaust muffler (23), and a cooling fan (15) driven by the engine (2) is disposed in the cooling air passage (44), wherein the box (30) is provided with blocking means (51) for blocking the cooling air passage (44) between the engine (2) and the exhaust muffler (23) when running of the engine (2) is stopped. The heat of the high temperature exhaust muffler can thus be prevented from affecting the engine/work machine unit even when running of the engine is stopped, while maintaining the soundproofing of the box housing the unit, etc.

Abstract: The present invention provides an exhaust chamber system, comprising a stationary propeller type blade assembly with a nose cone within or adjacent to an expansion chamber, to create a vortex that swirls exhaust gas towards the outlet. The resultant vacuum within the exhaust chamber aids in scavenging an internal combustion engines exhaust gases, and in reducing system back pressure The exhaust chamber maintains the sound level of the exhaust within acceptable limits, while delivering improved horsepower, torque, and/or fuel efficiency over standard and other performance mufflers.

Abstract: Methods and apparatus are provided for an exhaust duct having an externally replaceable acoustic liner. The exhaust duct includes a forward section that is configured to be axially coupled with a bulkhead collar on the aircraft, a body section that is coupled to the forward section and a stinger cap that includes the replaceable acoustic liner. The replaceable acoustic liner is configured to be slideably received by the body section.

Abstract: A muffler including an outer shell; an end plate that is laser-welded to the outer shell; a sheathing member that is provided on the outer side of the outer shell to sheath the outer shell with the sheathing member; and a shielding portion that prevents liquid from entering into the sheathing member through a clearance formed between the outer shell and the end portion of the sheathing member, at which the sheathing member is connected to the outer shell. Providing such shielding portion makes it possible to prevent liquid such as water from entering into the sheathing member through the clearance, because the shielding portion blocks such liquid. As a result, inconvenience due to entry of the liquid into the space is prevented, and connection between the sheathing member and the outer shell is secured.

Abstract: An exhaust deflector is attachable to a muffler. The exhaust deflector includes a single-piece housing having a flange that defines an inlet aperture, an outlet wall that defines an outlet aperture, and an intermediate wall that interconnects the flange and the outlet wall. A mesh is in contact with the flange and is positioned to cover the inlet aperture. A perforated member is sandwiched between the mesh and the intermediate wall such that the perforated member and the intermediate wall cooperate to define a space. A low-density material is disposed within the space.

Abstract: An improved muffler diffuser insert adapted to be used with, and mounted within, an exhaust muffler for effectively helping to reduce noise and back pressure attendant to engine operation. The diffuser comprises a cap end for abutting against an exhaust end of the muffler when the muffler diffuser is mounted within the muffler, which has at least one exhaust opening defined therein for cooperation with the exhaust end of the muffler so as to permit an exhaust flow from the exhaust end of the muffler to pass through. A body portion is connected to the cap end, and defines therein an elongated opening for permitting the exhaust flow from the muffler to pass through. A distal end of the body portion comprises an outermost end and two sound deflection portions positioned on either side of the outermost end for use in deflecting sound waves contained in the exhaust flow so as to enhance noise diffusion.

Abstract: A dosing device is provided that is suitable for administering a reagent into an exhaust chamber of an internal combustion engine. The device comprises a nozzle body and an insulating jacket wherein the jacket is mounted to the nozzle body at one or more mounting points, and wherein the dosing device is adapted to engage with a port located in the wall of an exhaust chamber. The insulating jacket defines a compartment, which can comprise an insulating material or can be substantially evacuated. The dosing device of the invention is advantageously insulated from the elevated temperatures in the surrounding environment, thereby allowing for the reagent to be maintained at an optimal working temperature range.

Abstract: A hand-held apparatus for spraying texture material including a body, a pressurized air source mounted on the body, a texture material hopper mounted on the body, and a texture delivery nozzle for selectively spraying texture material from the hopper onto a surface to be coated by propelling the texture material using pressurized air from the pressurized air source wherein each of the air source and the hopper can be disconnected from the body without the use of tools. An air directing plunger has a plurality of discontinuities at an outlet thereof, which may be radially outwardly directed recesses or radially inwardly directed teeth for reducing the noise generated by the pressurized air during operation.

Abstract: 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 slanted holes therein through which the exposure to the liquid in the flow chamber is effected. An axially sectioned drum with dimensionally different diameters, radial thicknesses and slanted holes therein is positioned over the rubber layer within an outer casing to establish a plurality of gas-filled cavities of different axial lengths and separated from each other along the axial length of the liquid flow chamber which is connected at its opposite axial ends by pipe sections to a piping system from which the liquid within the flow chamber is derived.

Abstract: A combination exhaust gas post treatment/muffler device in the exhaust gas section of an internal combustion engine is provided. The exhaust gas post treatment within the muffler, which forms sulfuric acid, takes place in at least one exhaust gas post treatment/muffler module, and only that housing thereof through which flows exhaust gas that is to be cleaned is produced from ferritic or austenitic stainless steel, thus making it possible to produce the outer walls of the muffler, as well as any inner element thereof, such as a transverse wall, that is disposed externally of the exhaust gas post treatment/muffler module of unalloyed sheet steel that is coated with aluminum or some other material.

Abstract: The invention relates to an attachment pin (1) for fixing an exhaust-gas muffler (2) in an apparatus part (4) of a portable handheld work apparatus (5) driven by an internal combustion engine. The exhaust-gas muffler (2) includes especially an exhaust-gas catalytic converter (3). An at least partially exposed region (6) is provided with a cooling surface (7) and is on the attachment pin (1) between the exhaust-gas muffler (2) and the apparatus part (4).

Abstract: 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 member and a second member where the second member includes a plurality of openings therethrough with each hole having a counter-bore on its upstream side. The first member has a size substantially smaller than the diameter of said flow path and a first plurality of openings therethrough. The openings are in fluid communication with the flow path. The second member has a size generally equal to the first member and a second plurality of openings therethrough, which openings are in fluid communication with the flow path.

Abstract: The present invention provides a tailcone and power assembly mountable to the body of an aircraft using a height adjustable dolly. The tailcone assembly comprises a longitudinal support member, a gas turbine engine mounted to the support member; a firewall; two curved rotatable casings hingeably connected to the support member; an inlet duct extending form an aperture in one of the rotatable casings to the engine inlet; an integral exhaust casing, and interface means for making necessary engine accessory connections to the aircraft. The tailcone is installed on the aircraft by mounting the tailcone in the adjustable dolly, rolling the dolly up to the aircraft, adjusting the dolly until the auxiliary power assembly is properly aligned for attachment to the aircraft, connecting the engine accessories to the aircraft, and bolting the assembly to the aircraft.