Abstract: PROBLEM TO BE SOLVED: To provide a device for preventing the freezing of the liquid reducing agent to be injected for supply to the upstream of the exhaust gas cleaning catalyst arranged in an exhaust system formed of an exhaust manifold, an exhaust pipe and a muffler of an internal combustion engine such as a diesel engine at cold time in a storage tank and a supplying pipeline. SOLUTION: A heating wire 9-2 is arranged over or a main part of a storage tank 7 and a supplying pipeline for the liquid reducing agent, and an enveloping layer of the heat insulating material is provided thereon, and furthermore, a heating wire heating means 9-1 is provided in the storage tank 7 at need, and these heating wires are electrified and electrifying is cut from outside in response to the atmospheric temperature and/or reducing agent temperature so as to maintain the appropriate temperature range for preventing the freezing of the liquid reducing agent. COPYRIGHT: (C)2000,JPO

Abstract: A muffler for an internal combustion engine has a vertically elongated expansion chamber into which an exhaust gas from the exhaust port of internal combustion engine is introduced. The expansion chamber is separated level-wise into a first expansion chamber and a second expansion chamber by a partition plate. An exhaust emission purifier formed of an oxidation catalyst is attached to the partition plate, thereby allowing the exhaust gas ejected from the exhaust port to be introduced into the second expansion chamber from the first expansion chamber via the exhaust emission purifier. The exhaust emission purifier is spaced apart from the exhaust port by a predetermined distance in a direction orthogonal to an ejecting direction of the exhaust gas.

Abstract: A muffler for quieting exhaust expelled from a pneumatic hand tool having a handle and an exhaust passage. The muffler includes an inner tube having a plurality of holes, a number of dividers fixedly and spacedly positioned about the inner tube, and an end cap attachable to the handle for closing off the exhaust passage. At least one of the end cap and the handle including an exit opening. The inner tube has distal and proximal ends and an exterior surface. A cutoff wall is located below at least one airflow opening. The cutoff wall forces exhaust air to exit the inner tube via the at least one airflow opening thereabove. Each divider extends outward from the inner tube exterior surface a distance less than the width of the main section. The combination of the inner tube and dividers are located within the main section. During hand tool use, exhaust air enters the inner tube proximal end, flows out the inner tube holes, moves around the number of dividers, and flows out the exit opening, the cutoff wall forcing exhaust air to exit the inner tube. The tortuous movement of the exhaust air slows it and assists in dampening any attendant noise. Alternative embodiments include an outer tube.

Abstract: An exhaust system for a vehicle includes a muffler connected to an exhaust pipe, which is in turn connected to an engine. A spark arrester is provided with a tail pipe and connected to the rear end of the muffler, and is capable of discharging an exhaust gas flowing through the muffler through the tail pipe of the spark arrester into the atmosphere. The interior of the muffler can be divided into a plurality of expansion chambers connected by restricting passages by attaching the spark arrester to the muffler to enhance the sound attenuating effect. The interior of the muffler is divided into the plurality of expansion chambers by separators disposed in the muffler and a spark arrester combined with the muffler.

Abstract: A support arrangement for an exhaust system including an upright muffler and an upwardly-extending exhaust stack located behind the cab of a truck. An arm is mounted on a frame member of the truck, and a vibration isolator supported on the arm in turn supports the weight of an exhaust pipe elbow, a muffler, and a stack located above the muffler, all oriented generally upwardly. An upper connecting assembly is attached to the exhaust stack and to a mounting fastened to the back side of the cab to support the muffler and stack with respect to longitudinal and lateral movement relative to the truck while still permitting some vertical movement of the cab relative to the frame. In one embodiment the upper connecting assembly is attached by way of elastomeric members which permit yet resist movement.

Abstract: A gas turbine driven power system includes a shell having an air inlet and an exhaust outlet. Mufflers are provided at the air inlet and the exhaust outlet, respectively. A gas turbine as a power source is provided in the shell and includes an inlet port and an outlet port. A heat exchanger is further provided in the shell in an air-passing space free of barrier formed between the muffler at the air inlet and the inlet port of the gas turbine. It is so arranged that all the air introduced into the shell through the air inlet passes through the heat exchanger for heat exchange with heat generated inside the shell.

Abstract: An integrated manifold, muffler, and catalyst device for an engine uses perforated ducts surrounded by a resonator volume. Exhaust flow is routed from the exhaust ports by the ducts to a close coupled catalyst. The combination of the perforated ducts with the resonator volume and close coupled catalyst reduces exhaust flow restriction while at the same time increasing catalyst performance and reducing noise emissions.

Abstract: A compressed air exhaust arrangement in a pneumatic fastener driving tool. An exhaust port is formed in an upper portion of a main body, and a cover member is fixed onto the upper portion. An annular muffler member is disposed between the cover member and an upper surface of the main body to surround the exhaust port. The cover member has a lower surface formed with a plurality of cranked grooves for providing a plurality of air vent passages relative to an upper surface of the muffler member. The air vent passage allows the compressed air from the exhaust port to pass therethrough toward an atmosphere. Before freeze of the muffler member, most of the compressed air discharged through the exhaust port directly passes through the muffler member. After freeze of the muffler member, the compressed air passes through the air vent passage.

Abstract: A compressor having a device for recovering lubricating oil. The compressor includes a discharge chamber and a muffler, which attenuates the pressure pulsation of refrigerant gas sent out from the discharge chamber. The muffler is defined by a muffler base, which is formed on the cylinder block, and a muffler cover, which is attached to the muffler base. The muffler includes a first muffler chamber and a second muffler chamber, which are connected by an opening. The muffler cover has a gas outlet for sending the refrigerant gas out of the compressor from the second muffler chamber. Lubricating oil separated from the refrigerant gas in the first muffler chamber is sent to the crank chamber through a recovery passage. The location of the gas outlet can be easily changed by replacing the muffler cover. Thus, the compressor can be easily adapted to different engine compartments.

Abstract: A muffler exhaust tip has a first end provided with clamping members and a second end having a decorative exterior finish. The construction of the muffler tip allows the manufacturer to provide multiple decorative exterior finishes on the muffler tip body. Two adjustable clamping members facilitate attachment of the muffler tip to an exhaust pipe of a motor vehicle. The clamping members attach to the tailpipe of a muffler with a high retention force and can accommodate tailpipes of different diameters for a "universal" fit. A sound amplifying member is set inside the muffler tip, comprising a dual plate member which increases the sound decibel output from the tailpipe and also provides an attractive end cover for the muffler tip.

Abstract: A muffler (14) suitable for use with an apparatus (12) for supplying breathable gas to a patient, the muffler (14) being sized and shaped to be able to be located internal the housing (10) of the apparatus (12). The muffler (14) can include means to locate one or more acoustically absorptive inserts (24) within the muffler (14). The apparatus (12) can include a flow generator, a gas outlet (18) and the muffler (14) can be interposed in fluid communication between the flow generator and the outlet (18).

Abstract: To prepare an absorption muffler for motor vehicles with a sound-absorbing material arranged in a hollow space of an exhaust muffler body in the form of glass wool (2), which is introduced into the hollow space in the form of an expanded, endless glass fiber roving, it is proposed that the exhaust muffler body (1) be completely prefabricated and assembled before the glass wool (2) is introduced into the prefabricated, assembled exhaust muffler body (1) from the outside.

Abstract: A loose fiber packing material for a muffler of an internal combustion engine is temporarily confined in a transfer cartridge, having a shape which is substantially complementary or somewhat smaller than the muffler cavity. The transfer cartridge is adapted to receive a pushing device for discharging the loose fiber packing material from the transfer cartridge into the muffler cavity during manufacture of the muffler. The transfer cartridge allows loose fiber packing to be prepacked, shipped and directly transferred to a muffler cavity without the use of molding resins or packaging materials which would otherwise be inserted into the muffler along with the loose fiber packing material and burned away during initial use of the muffler, causing undesirable smoke and odor.

Abstract: 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 outlet end caps. The casing also has a defined exhaust gas-flow passageway, which extends between the end caps, which is bounded by upper and lower walls within the casing and the side walls, and which includes inlet and outlet chambers adjacent to the inlet and outlet end caps, respectively. Two spaced apart, gas-flow channels. A gas-flow director assembly, disposed between the side walls and the upper and lower walls, defines two spaced apart gas-flow channels. The gas-flow channels have a uniform, smooth cross-section, and their lengths are substantially equal. The gas-flow director assembly divides the exhaust gases flowing into the gas inlet chamber into two substantially unrestricted and equi-volume gas streams, and also defines an intermediate chamber, which communicates with the gas-flow channels, intermediate their ends, so as to permit the exhaust gases flowing in the channels to expand and mix for sound attenuation. Perforations in the upper and lower walls permit sound waves in the exhaust gases to be attenuated in sound absorption materials disposed in the closed volume of the casing about the gas-flow passageway.

Abstract: A free-standing, compressed, hardened porous, resilient sheath of sound absorbing fibrous material for use in silencer or muffler pipes as the intermediate sound absorbing element between the inner perforated and outer sleeve elements of a three-element pipe is formed by (a) wrapping an uncompressed pad of fibrous material containing a thermo-setting hardening agent around a shaped mandrel having outside surface shape and dimensions conforming the outside surface shape and dimensions of the inner three-element muffler pipe, (b) subjecting the wrapped mandrel and sheath of uncompressed material to a pressure sufficient to conform the outside surface of the compressed pad to the inside surface shape and dimensions of the outer muffler pipe sleeve element, and to a temperature sufficient to set the thermo-setting hardening agent; and (c) removing the mandrel. Three-element muffler pipes comprising the hardened porous sheath, mufflers containing the three-element pipes, and methods for making the hardened porous sheaths, three-element muffler pipes, and mufflers are also disclosed.

Abstract: Disclosed is a suction muffler for a compressor. The suction muffler has a body and a suction pipe. The body has an expansion chamber for expanding gaseous refrigerant flowing from an evaporator, a suction chamber for drawing the refrigerant expanded in the expansion chamber, and a resonance chamber in which the refrigerant drawn into the suction chamber resonates. The suction pipe is assembled with the body and connects the suction chamber with a cylinder head of the compressor. The suction pipe provides a passage that the refrigerant in the suction chamber flows into the cylinder head. The refrigerant flows into the suction chamber after being expanded in the expansion chamber, so the noise caused by the pulsation of pressure is reduced, and the refrigerant resonating in the resonance chamber can reduce the noise of a specific frequency. Further, since the suction muffler has a simple construction having small number of components, the leakage of noise through the gaps between components can be reduced.

Abstract: A heat deflection system is provided for a lawn tractor which has an engine mounted on a chassis and enclosed within an engine enclosure. The engine enclosure has a top, sides and a front grille. The engine also includes a carburetor, an exhaust header and a muffler. The heat deflection system includes a heat shield having at least a portion thereof disposed between the exhaust header and carburetor, a partition having openings therein, wherein the openings extend above the muffler, such that the heated air from the muffler rises and passes through the openings, and the heat deflector extending above the partition for directing soak heat from the muffler away from the carburetor.

Abstract: A muffler for small general-purpose engine includes a case comprising a pair of case halves coupled together and divided into a first chamber and a second chamber by a partition plate. An inlet of the exhaust gas is provided closer to a first end portion of the case in a first case half. An outlet of the exhaust gas is provided closer to a second end portion of the case in a second case half. A recess projecting from the first chamber toward the second chamber guiding the exhaust gas from the inlet toward the second end portion is provided in the partition plate opposite the inlet. A communication orifice is formed in the partition plate at a location offset from the recess and closer to the first end portion than the inlet.

Abstract: This study experimentally demonstrates the use of an active muffler attached to an automotive exhaust system to reduce exhaust noise.For improving the signal to noise ratio in the process of estimating secondary path transfer functions, an on-line algorithm in which conventional inverse modeling is conbined with an adaptive line enhancer is used as the controk algorithm.The active muffler is designed so that the primary noise and the control sound are propagated as a plane wave in the outlet.Therefore, the error microphone could be placed outside the high temperature centers of the tail pipe, and the noise radiating to the outside could be reduced in the whole area around the outlet.The control experiment for reducing exhaust noise with an active muffler is implemented during run-up on no load.Compared with the conventional off-line method, it can be seen from the experimental results presented the proposed on-line method is capable of acquiring a reduction of more than 5dB of exhaust noise in overall sound power level.

Abstract: An apparatus (30) for use in pumping hydraulic fluid includes a pump unit (32) which is driven by an electric motor (34). The electric motor (34) is mounted on a tubular stem (108) which extends axially outward from a manifold plate (44). A stator (100) of the electric motor (34) is fixedly connected with the tubular stem (108). A rotor (112) of the electric motor (34) encloses the stator (100). A hydraulic muffler (50) attenuates noise produced by the gear pump unit (32). The hydraulic muffler (50) includes a channel (58) which extends into the manifold plate (44) from a major side surface (63) of the manifold plate. To increase the ability of the hydraulic muffler (50) to attenuate noise, one or two compliant elements (152 or 166 and 168) are connected with the channel (58).

Abstract: A two pathway exhaust and water discharge through-hull system is coupled to a muffler for separating exhaust gases and cooling water at operating speeds such that at low engine speeds exhaust gases and water are discharged through a first outlet preferably above the waterline and, when the engine speed is increased above a predetermined level, exhaust gases are discharged through a second outlet which communicates with a streamlined, low back-pressure underwater discharge skeg and water is discharged through the first outlet. In a preferred embodiment of the invention, a discharge skeg is positioned at each comer of the transom for a twin engined vessel. In a preferred embodiment also, each of the underwater discharge skegs is mounted to the bottom of the hull and includes a mounting flange and an upwardly extending collar which extends through the hull and is coupled to an adapter for coupling the discharge skeg to an exhaust outlet of a muffler. As a result, an exhaust system is provided which is efficient, quite and which discharges exhaust gases underwater and away from the vessel when underway at normal operating speeds.

Abstract: A spark arrester includes a buffer plate against which exhaust gases discharged from the outlet end of a tail pipe strike directly. Upon impingement on the buffer plate, the exhaust gases become turbulent or agitated whereupon temperature distribution of the exhaust gases is made uniform. The buffer plate has a plurality of through-holes arranged to allow passage of the exhaust gases after the exhaust gases impinge against the buffer plate. After passing through the through-holes, the exhaust gases flow through a wire screen during which time sparks in the exhaust gases are caught by the wire screen. The exhaust gases are then guided downstream along a guide tube and finally released from an outlet end of the guide tube. A stream of exhaust gases discharged from the guide tube has only a limited length of high-temperature zone.

Abstract: An apparatus mounted on a trailer is used to connect to an underground pipe array such as is installed under a golf course The apparatus includes a vertical shaft blower unit with an impeller rotating in a horizontal plane An engine mounted on the blower unit has a vertical engine shaft connected to the vertical shaft of the blower unit An inlet duct of the blower unit is located below a discharge duct of the blower unit The inlet duct and discharge duct are oriented in the same direction, and when the engine is a gasoline engine having an exhaust muffler, the exhaust muffler is oriented in the same direction as the inlet and discharge ducts Since all the noise discharge points of the apparatus are pointed in the same direction, the trailer can be turned so that the noise generated during operation of the apparatus is directed away from players on the golf course A water separator is preferably connected between the inlet duct and the impeller In addition, a frame is connected to either the blower unit or the trailer for easy stowage of the flexible hose used to connect the blower unit to the underground pipe array

Abstract: PROBLEM TO BE SOLVED: To provide an intake air muffler device for automobile capable of effectively lowering intake air noise though its device is simple in structure with parts reduced in number. SOLUTION: Four intake passages 24, 25, 26 and 27 different in length, are formed up by connecting the upper wall 17 and lower wall 18 of an intake air muffler device formed into a flat shape, with three pieces of partitioning walls 21, 22 and 23. Air passing through plural intake passages 24, 25, 26 and 27 different in length, is different in phase by each passage so as to allow pulsations to be generated in the respective passages. In this case, let these pulsations be interfered with one another, so that noise can thereby be reduced. And furthermore, since these partitioning walls 21, 22 and 23 function as stiffening ribs, so that the stiffness of the intake air muffler device can thereby be enhanced. In addition, each partitioning wall 21, 22 and 23 is so formed as to be laid along the flow direction of intake air, an increment of intake air resistance can thereby be kept to the minimum. COPYRIGHT: (C)2000,JPO

Abstract: A compressor having a housing formed by joining a plurality of housing components. A plurality of muffler elements are formed integrally with the housing components along the periphery of the housing. A muffler chamber is defined in the housing by coupling the housing components to one another. A large volume chamber and a small volume chamber are defined in the muffler chamber and connected to each other. An inlet is provided in at least one of the muffler elements for drawing the gas in the discharge chamber into the large volume chamber. An outlet is provided in the muffler elements for discharging the gas in the small volume chamber into the external circuit. The arrangement and construction of the housing is such that the pressure pulses in the discharge gas are reduced, and thus vibration and noise are reduced.

Abstract: PROBLEM TO BE SOLVED: To obtain a calked joined product with high joining strength and a satisfactory appearance by locally annealing preliminarily only both tip parts of a muffler outer jacket, and lowering the hardness of the only annealed parts before plastically deforming the muffler outer jacket and lid material by electromagnetic forming and joining them. SOLUTION: When performing the electromagnetic forming by fitting the lid materials 3 with both tip parts of the muffler outer jacket 2 in an internal fitting state, the only both tip parts of the muffler outer jacket 2 which is in a drawn state, are locally annealed. It is preferable that the annealing is performed by high frequency induction heating which is effective in local heating. Consequently, the muffler outer jacket 2 becomes a tube with the only both tip parts softened while maintaining necessary hardness in an intermediate part except both tip parts. After that, by fitting the lid material 3 with the tip part of the muffler 2, by applying a force in the tube contraction direction to the peripheral wall of the tip part of the muffler outer jacket 2, and by calking the peripheral wall of the tip part to the outer peripheral part of the lid material 3, the peripheral wall of the tip part is subjected to plastic deformation so that it is dug into annular grooves 5.

Abstract: PROBLEM TO BE SOLVED: To improve the sound reducing effect with a simple structure in a vehicle exhaust system having a spark arrestor integrated to the rear part of a muffler by partitioning the muffler inner part into a plurality of expansion chambers mutually communicating through a throttle passage by the separator and spark arrestor provided within the muffler. SOLUTION: A spark arrestor body 21 is formed by partitioning a muffler M inner part into a plurality of expansion chambers C1 -C3 mutually communicating through throttle passages 33, 34 within separators 9, 10 and a spark arrestor A. In engine operation, exhaust gas is carried into the silencing cylinder 2 of the muffler M through an exhaust pipe Pe, the exhaust gas in the silencing pipe 2 is carried into the expansion chamber C1 , into the expansion chamber C2 through the restriction passage 33, and then into the expansion chamber C3 through the restriction passage 34, during which the exhaust gas is repeatedly expanded and contracted to effectively reduce the sound. The exhaust gas in the expansion chamber C3 is carried from a non-purifying chamber C3 -D to a purifying chamber C3 -C through a filter 30 to capture and purify the unadorned component, and then released through a tail pipe 23.