Abstract: A power tool having an internal combustion engine with a muffler and a combined muffler exhaust outlet and exhaust gas deflector connected to the muffler. The combined outlet and deflector is a single one-piece member. The one-piece member is connected to the muffler by interlocking capture of a portion of the member by the muffler and attachment of a single fastener between the member and the muffler.

Abstract: An inlet tube leads exhaust gas from an automobile engine to an expansion chamber inside a muffler housing. Exhaust gas from the expansion chamber is discharged to the atmosphere via a first tail tube. A dead space chamber and volume chamber are disposed on either side of the expansion chamber in the housing, and a first internal tube connects the volume chamber and expansion chamber. A second internal tube having a valve which opens under pressure of the exhaust gas connects the volume chamber and dead space chamber. Exhaust gas from the dead space chamber is discharged to the atmosphere via a second tail tube. As the dead space chamber and volume chamber are not adjacent, pressure waves in the volume chamber do not cause a volume change of the dead space chamber, and emission noise from the second tail tube due to excitation of a resonance system comprising the dead space chamber, is reduced.

Abstract: An exhaust system for a personal watercraft provides an exhaust adapter plate and an exhaust header pipe that allows exhaust to exit from the rear of a horizontally mounted internal combustion engine. The exhaust adapter plate is mounted to the rear of the engine block. The exhaust adapter plate has openings corresponding to the engine exhaust port and engine cooling water jacket. The adapter plate also has an opening for the engine crankshaft. The exhaust header pipe is mounted to the engine with the adapter plate disposed therebetween. An exhaust passage through the exhaust header pipe passes transversely across the engine compartment within the watercraft. As the exhaust header pipe passes transversely across the engine compartment, the exhaust passage angles upwardly from the exhaust adapter plate to a high point, and angles downwardly from the high point to an exhaust outlet leading to a muffler. The exhaust passage through the exhaust header pipe is tuned, yet the configuration of the exhaust header pipe provides a compact design that is easily packaged within the engine compartment for a personal watercraft, and also provides for sufficient space rearward of the exhaust header pipe so that the exhaust system and the remainder of the engine can be easily serviced. Also, since the exhaust header pipe and the exhaust adapter plate are physically separate components, each can be designed to be manufactured using simpler manufacturing techniques.

Abstract: A muffler for an internal combustion engine has an expansion chamber (31, 32) into which exhaust gas from the engine is introduced. The expansion chamber has a double wall (32A), with an inner panel (42) of the double wall (32A) having exhaust gas discharge portions (42A, 42B, 42C, 42D) with respective blowout holes (61, 62, 63, 64) for introducing the exhaust gas from the expansion chamber (32) into an air space (Sb) in the double wall (32A). From the air space (Sb), the exhaust gas is vented to the ambient through a discharge hole (37A) in an outer panel (42) of the double wall (32A ). A spark arrester screen (72) covers the discharge hole (37A).

Abstract: A loose packing material for the muffler of an internal combustion engine is confined by a mesh, for handling the loose packing as a unit during assembly of the muffler. The openwork nature of the mesh is such that the mesh does not affect the sound or tune of the muffler, such that the original sound of the muffler is the same as its long term sound. The mesh can comprise fiberglass or metal mesh, but preferably includes a heat consumable material such as a thermoplastic polymer. The mesh can be formed as a wholly or partly closed bag with a shape complementary to a muffler cavity, which can be irregular. The heat consumable type of bag is formed by heat sealed seams. The mesh holds the loose packing material clear of peripheral seams or internal points at which structural parts of the muffler are intended to abut. The confined packing and its methods are particularly apt for stamped plate mufflers and are likewise applicable to other forms such as rolled casing and extruded casing muffler structures.

Abstract: An exhaust assembly for use with a motor vehicle having a combustion engine, which exhaust assembly comprises combustion engine-connecting means, at least one exhaust and at least one muffler, wherein means are provided for controlling the damping characteristic of the exhaust assembly. The exhaust assembly comprises at least a first combustion gas flow route and a second combustion gas flow route, wherein the means for controlling the damping characteristic are operable during use of the exhaust assembly with a combustion engine coupled thereto and are adapted to guide the combustion gases of the engine at least partly along one of the combustion gas flow routes.

Abstract: A first muffler (4) is connected to a rear end portion of the exhaust pipe (2) extending from a single-cylinder engine toward one side of a rear portion of the vehicle body and is provided on one side of the vehicle body. A second muffler (5) is provided on the other side of the vehicle body opposite to the first muffler (4) through a connecting pipe (6). An outer side surface near the front end portion of the first muffler (4) and the second muffler (5) are covered with first and second covers (7) and (8) both plated. Each of the exhaust pipe (2) and the first and second mufflers (4) and (5) have double-pipe structure with outside plated. Further, a front end portion of the second cover (8) is curved toward the center of the vehicle body, and a phantom line as a continuous frontward extension from the front end portion of the second cover (8) is positioned before the axis of the connecting pipe (6).

Abstract: An exhaust muffler includes upper and lower internal plates and upper and lower external shells. The internal plates are formed to define a chamber therebetween. The external shells are formed to define chambers on opposite respective sides of the interconnected internal plates. An upper tube plate is secured to the upper internal plate. The upper tube plate and the upper internal plate are formed to define an inlet tube therebetween. The inlet tube includes louvers to permit exhaust gas flow into the chamber between the upper internal plate and the upper external shell. Louvers in the upper internal plate permit exhaust gas to flow from the upper chamber into the internal chamber between the internal plates. Louvers in the lower internal plate permit exhaust gas to flow into the lower chamber. An outlet tube communicates with the gravitational low point in the lower external shell and permits flow of exhaust gas from the muffler while siphoning condensate in the lower chamber.

Abstract: A suction muffler for a hermetic compressor, comprising a hollow body (10) affixing a gas duct (20) which is defined by a gas inlet portion (21) having an inner end (21a) internal to said muffler body and an outer end (21b) external to said muffler body and in fluid communication with a suction inlet tube (8) provided in the hermetic shell (1) of the compressor, and a gas outlet portion (22) having an inner end (22a) internal to said muffler body and an outer end (22b) external to said muffler body and connected to a suction orifice, which is provided in the head (5) of a cylinder disposed inside the shell (1) and where is mounted the suction muffler, the extension of the gas duct (20) internal to the hollow body (10) being spaced from the walls thereof.

Abstract: A noise reducing muffler for a compressor includes a base muffler and a suction muffler connected to an upper end of the base muffler. Gaseous coolant flows through the suction muffler and the base muffler and into a cylinder head of a compressor. The suction muffler defines a path of travel wherein all of the gaseous coolant flows vertically downwardly, then horizontally, and then vertically downwardly to the base muffler.

Abstract: A motorcycle exhaust system, which can prevent the generation of noise by vibrations and interference of an exhaust pipe heat insulating cover and a muffler heat insulating cover for protecting exhaust pipes and a muffler. Exhaust pipes and a muffler are protected by an exhaust pipe heat insulating cover and a muffler heat insulating cover, and confronting ends of the covers and are joined via an elastic member.

Abstract: A muffler utilizing a stackable porous disk sandwiched between a threaded mounting plate and an end cap and utilizing tie rods to assemble the stack is provided.

Abstract: PROBLEM TO BE SOLVED: To prevent a valve from fluttering caused by over-stroke of an actuator in full-opening of a valve as well as to obtain smooth accelerating feeling and comfortable accelerating exhaust sound in the accelerating operation while achieving reduction of cost, miniaturization and sharing, in a control-type exhaust system for controlling a function of the exhaust system by opening and closing a valve provided on the way of the exhaust system extending from an engine to the atmosphere. SOLUTION: A control-type exhaust system is provided with a pressure conduit 10 for introducing exhaust pressure from an exhaust muffler 1, a cylinder-type actuator 11 in which the pressure conduit 10 is connected to a cylinder chamber, and a piston and a spring are housed, a butterfly valve 12 whose valve opening is to be changed into no stage according to the magnitude of a piston stroke. Moreover, it is provided with an adapter link 17 whose one end is connected to a valve opening and closing lever 16, whose the other end is connected to a piston rod, and in which a valve full opening stopper recessed part 17a for specifying an actuator stroke in the full-opening position of the butterfly valve 12 is formed.

Abstract: A hermetic reciprocating compressor comprises a hermetic casing and a compressing portion installed inside the casing. The compressing portion includes a cylinder, and a piston reciprocating inside the cylinder. A suction pipe transfers a mixture of compressible and incompressible media (e.g. gaseous refrigerant and lubricating oil) into the casing. A suction muffler has an inlet communicating with the suction pipe and an outlet connected to the compressing portion. A tubular spring has a first end portion of frusto-conical shape fitted into the inlet of the suction muffler so that a space is formed between the first end portion of the spring and the inlet of the suction muffler, and a second end portion connected to the suction pipe. Incompressible medium in the mixture is able to gravitate out of the suction muffler through the space, thereby preventing damage to internal parts of the compressing portion.

Abstract: A hermetically sealed compressor includes a cylinder forming a compression chamber, and a piston reciprocally mounted in the cylinder for compressing gaseous refrigerant. A mixture of gaseous refrigerant and lubricating oil is conducted via a conduit arrangement to a suction muffler located upstream of the compression chamber. The conduit arrangement includes, at an inlet to the suction muffler, radially inner and outer tubes forming a channel therebetween. Gaseous refrigerant flows into the suction muffler through the inner tube. Lubricating oil traveling radially outwardly of the gaseous refrigerant enters the channel and is discharged from a downstream end of channel and thus does not enter the suction muffler.

Abstract: A muffler is connected to a pair of exhaust pipes extending from each cylinder of a multi-cylinder engine. The muffler assures easier assembling work and provides independent exhaust sound for each cylinder. The muffler includes a forward and a rearward expansion chamber within the inside thereof. The expansion chambers are separated in the longitudinal direction by a separation wall extending across the muffler. The exhaust pipe connected to the forward cylinder of a V-type two-cylinder engine is inserted into the forward expansion chamber, while the exhaust pipe connected to the rear cylinder is inserted into the rearward expansion chamber.

Abstract: A liquid cooling system for an internal combustion engine of an outboard motor is disclosed. The cooling system includes a pump for delivering coolant to one or more coolant passages in the engine. At least one thermostat is provided for controlling the flow of coolant through the engine to one or more return lines which extend to a coolant pool extending about a lubricating oil reservoir. A pressure relief valve is provided between the pump and thermostat for relieving coolant from the engine upon excessive coolant pressure. The relieved coolant is preferably either delivered to a drain, a second coolant pool extending about a muffler, or the first coolant pool. Preferably, a diverter is provided for controlling the flow of the relieved coolant. When a temperature of the lubricating oil is high, the relieved coolant is preferably diverted to the first coolant pool for additionally cooling the oil in the reservoir, and when the temperature of the oil is low, the relieved coolant is preferably either diverted to the second coolant pool or the coolant drain for passage out of the motor.

Abstract: An apparatus comprises a reservoir (14) containing hydraulic fluid (68), a gear pump (16) with a suction hole (74), and a hydraulic muffler (18). The gear pump (16) has gears (78) with meshing teeth (80) that convey a flow of hydraulic fluid (68) from the reservoir (14) into the pump (16) through the suction hole (74). The muffler (18) attenuates noise by damping flow rate fluctuations that are caused by the meshing gear teeth (80). The muffler (18) includes a compliant element (92) and a fluid inertia structure (90) interposed between the suction hole (74) and the fluid (68) in the reservoir (14). The inertia structure (90) responds to the flow rate fluctuations by directing corresponding hydraulic pressure fluctuations to deflect the compliant element (92). As a result, noise is attenuated upon deflection of the compliant element (92).

Abstract: A bumper/muffler assembly is provided to simultaneously perform noise attenuation functions and impact protection for an automotive vehicle. The bumper/muffler assembly is formed at least in part from stamped sheets of metal. The sheets include an internal plate formed with inlet and outlet channels therein. Inlet and outlet tube plates are secured to portions of the internal plate adjacent the inlet and outlet channels such that inlet and outlet tubes are defined. A front external shell is disposed in proximity to the rear end of the vehicle and is configured to be spaced from portions of the internal plate to define a front chamber. A rear external shell also is spaced from the internal plate to define a rear chamber. A plastic material may be nested over the rear external shell for aesthetic attractiveness of the assembly.

Abstract: The present invention is a noise reduction apparatus for use in the exhaust system of an internal combustion engine which absorbs acoustical energy from the pressurized exhaust gases while minimizing restrictions on the exhaust gases as they flow therethrough. The relatively unrestricted exhaust gas flow provided by the present invention significantly reduces the build up of back pressure and the associated drop in power and performance of the engine. At the same time, by absorbing acoustical energy from the exhaust gases, the noise level of the exhaust system is reduced. The present noise reduction apparatus includes a housing operatively adapted for being disposed in the exhaust system of an internal combustion engine, and a plurality of sound absorbing layers disposed inside the housing. Each layer is operatively adapted to allow exhaust gases to flow therethrough while absorbing acoustical energy from exhaust gases coming in contact with the layer.

Abstract: PROBLEM TO BE SOLVED: To prevent exhaust gas from leaking out indoors through a trap by providing a trap opening and closing valve which closes the trap when an engine is started and operated at overload in the trap. SOLUTION: A trap 12 is communicated with a drain 11 of an exhaust muffler 6, and a trap opening and closing valve 13 which closes the trap 12 when an engine is started and operated at overload by a valve drive signal K from a control circuit 15 is provided. The condensed water in the exhaust muffler 6 is discharged through the trap 12. A bypass passage 14 which communicates an exhaust gas outlet 10 of the exhaust muffler 6 with an upstream side of the trap 12 of the trap opening and closing valve 13 is provided, and a bypass valve 16 which opens the bypass passage 14 in the interlocking relationship with the closing operation of the trap opening and closing valve 13 is provided here. A valve drive signal K is output based on a detection signal T1 from a temperature detector 17 in the trap 12 and a detection signal T2 from a temperature detector 18 in the exhaust muffler 6.

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: A muffler includes a pair of internal plates that are formed to define an array of channels and at least one chamber. The internal plates are connected in face-to-face relationship such that the channels define tubes that communicate with the chamber. At least one short section of conventional tube may be disposed between the plates to achieve a selected exhaust gas flow pattern. The connected internal plates is slid longitudinally into a tubular outer shell and end caps are secured to opposed ends to substantially enclose the muffler. The internal plates can be remanufactured prior to insertion into the tubular outer shell, and can be slid into tubular external shells of different lengths for significantly altering the acoustical tuning of the muffler.

Abstract: A reinforcement insert for use in a coupling components in marine exhaust systems. The insert is generally made of a much stronger material than fiberglass and is inserted within corresponding openings of exhaust system components which are to be coupled. Thereafter, a sleeve and pipe clamps are secured to the exhaust system components and tightened thereon. The inserts prevent fracturing of the coupling area between the exhaust system components and thereby prevent dangerous leakage conditions which could otherwise result in the sinking of a vessel or other undesirable consequences.

Abstract: A muffler includes a housing and one or more tubes secured in the housing. A valve member is engaged in each of the tubes for adjusting an opening size of the tube and for adjusting the pressure that may be generated in the housing such that the mufflers may be secured to various kinds of engines. The valve member includes a ball rotatably engaged in the tube and having an orifice for adjusting the opening size of the bore when the ball is rotated. A filter material is engaged in the housing and may be squeezed for adjusting the output noise of the muffler.

Abstract: A muffler includes a pair of internal plates that are formed to define an array of channels and at least one chamber. The internal plates are connected in face-to-face relationship such that the channels define tubes that communicate with the chamber. At least one short section of conventional tube may be disposed between the plates to achieve a selected exhaust gas flow pattern. The connected internal plates is slid longitudinally into a tubular outer shell and end caps are secured to opposed ends to substantially enclose the muffler. The internal plates can be remanufactured prior to insertion into the tubular outer shell, and can be slid into tubular external shells of different lengths for significantly altering the acoustical tuning of the muffler.

Abstract: A motor vehicle muffler mounted with a plurality of baffles, the muffler comprising a variable control unit constructed such that at least one baffle in the muffler is moved to vary volumes of chambers according to a depression of an accelerator pedal, to obtain an optimum noise attenuation effect and to increase exhaust efficiency.

Abstract: An internal combustion engine assembly comprises an internal combustion engine and an exhaust assembly connected to an exhaust outlet of the engine. The exhaust assembly comprises: an exhaust pipe having an inlet end connected to the exhaust outlet of the engine and an outlet end; a generally cylindrical muffler having a central longitudinal axis, the muffler having an inlet end and an outlet end; and a muffler support having a pivot; the muffler having an operating position, in which operating position the said axis of the muffler is substantially vertical and the inlet end of the muffler is in gas flow communication with the outlet end of the exhaust pipe, and a storage position, in which the said axis of the muffler is substantially horizontal. The muffler is connected to and arcuately movable about the pivot of the muffler support between the operating position and the storage position.