A muffler for receiving exhaust gas from a combustion engine is disclosed. The muffler includes a casing and a pipe. The casing includes a shell coupled to first and second end caps that cooperate to define an internal volume. The pipe is disposed within the internal volume and extends substantially a length of the shell. Each of the first and second end caps includes a circumferentially extending flange engaging an outer surface of the pipe to provide support for the pipe. Each circumferentially extending flange extends at an acute angle relative to a shell axis of the shell. Each circumferentially extending flange is coaxial along a pipe axis of the pipe.

A device for reducing airborne and structure-borne sound has a flow channel with a flow channel wall (22, 22, 22) and at least one resonator chamber (40, 40, 40) adjacent the flow channel wall (22, 22, 22). The flow channel wall is formed by a sound absorber (30, 30, 30) at least in a part bordering the resonator chamber (40, 40, 40). The sound absorber (30, 30, 30) is covered towards the resonator chamber (40, 40, 40) by an acoustically reflecting inner wall (42, 42, 42) of the resonator chamber with at least one wall aperture (44, 44, 44). Openings (32, 32, 32) completely covers the wall aperture (44, 44, 44) of the inner wall (42, 42, 42) of the resonator chamber such that sound waves flowing through the flow channel must pass the sound absorber (30, 30, 30) to enter the resonator chamber (40, 40, 40).

A customized muffler is an apparatus that provides a sportscar-like sound for any exhaust system. The apparatus includes an outer cylindrical shell, a first outer cone, a second outer cone, and at least one sound modifier. The outer cylindrical shell, the first outer cone, and the second outer cone are fixed together and replace an existing muffler. The at least one sound modifier includes an annular disk and a plurality of slots which creates the sportscar-like sound. The first outer cone and the second outer cone also contribute to the sportscar-like sound as a result of the tapering construction of the first outer cone and the second outer cone. The apparatus further customizes the sound of an engine as the apparatus further includes a combination of a first central tube, a second central tube, an air deflector, a third cone, and a fourth cone positioned within the outer cylindrical shell.

A muffler structure contains: a body, a first cover unit, and a second cover unit. The body includes an accommodation tube, fiber cotton, and a first mesh portion. The accommodation tube has an accommodating space and an internal fence. The first cover unit includes a manifold connection portion, a first polygonal cap, a hollowly tubular mesh having multiple orifices, a second mesh portion, and a stainless steel mesh. The second cover unit is fixed on a rear end of the accommodation tube of the body opposite to the first cover unit, and the second cover unit includes a second polygonal cap and a silencer. The second polygonal cap is covered on the accommodation tube of the body, and the second polygonal cap has a receiving portion defined in a free end thereof and configured to accommodate the silencer.

Apparatuses and methods for tuning a muffler. An apparatus comprises a housing for a muffler, a first inlet pipe, and a second inlet pipe. The housing includes a coupling chamber. The first inlet pipe has a first set of physical features and carries exhaust to the coupling chamber. The second inlet pipe has a second set of physical features and carries the exhaust to the coupling chamber. The first set of physical features varies from the second set of physical features with respect to at least one physical feature such that a first sound waveform passing through the first inlet pipe and a second sound waveform passing through the second inlet pipe are uniquely tuned to thereby tune an overall sound waveform emitted by the muffler.

A vehicle exhaust system includes a tubular component having an inner surface and an outer surface. The vehicle exhaust system also includes at least one opening defined by the tubular component. The at least one opening extends through each of the inner surface and the outer surface. The vehicle exhaust system further includes a patch adapted to cover the at least one opening. The patch includes a first portion extending parallel to the central axis. The first portion defines a plurality of pores. The first portion covers the at least one opening. The patch also includes a second portion extending away from the first portion. The first portion has a first thickness and the second portion has a second thickness.

A generator includes an elongated tubular frame, an internal combustion engine attached to the elongated tubular frame, the engine including an engine block including a cylinder and a crankshaft configured to rotate about a crankshaft axis. The generator further includes a fuel tank attached to the elongated tubular frame. The elongated tubular frame is configured to simultaneously support the internal combustion engine and the fuel tank.

An exhaust gas purification device includes a pre-oxidation catalyst disposed in an exhaust gas passage and a muffler that is provided in such a manner as to surround the pre-oxidation catalyst, and discharges exhaust gas while reducing noise. The muffler has an inlet which is connected to an upstream side exhaust pipe and an outlet which is connected to a downstream side exhaust pipe. The exhaust gas purification device includes a downstream side purification device that is disposed in the exhaust gas passage, and accommodates a second oxidation catalyst and a particulate matter removing filter. The exhaust gas is discharged to the atmosphere after the exhaust gas flows through the downstream side purification device.

An exhaust component assembly includes a component housing defined by an outer dimension and having at least one sensor opening. A sensor boss surrounds the at least one sensor opening and at least one exhaust component is positioned radially outwardly of the component housing and includes an opening that surrounds the at least one sensor opening. A first flange extends about an outer periphery of the sensor boss and a second flange is associated with the opening of the at least one exhaust component to accommodate variations in the outer dimension such that the first and the second flanges can be attached to each other.

An exhaust muffler includes first and second pipes which extend through a casing, and which are disposed so that a downstream end of the first pipe faces an upstream end of the second pipe, wherein the downstream end of the first pipe and the upstream end of the second pipe are disposed so as to be spaced from each other in an axial direction, one end part of a support member having a circular cross section that has a smaller diameter than those of the first and the second pipes is fixed to one of a first lid member covering an opening at the downstream end of the first pipe and a second lid member covering an opening at the upstream end of the second pipe, and the other end part of the support member is slidably fitted to the other of the first and the second lid members.