An exhaust component comprises a main casing and at least one partial casing pressed against the main casing. In a developed state, the partial casing has an elongated shape along a longitudinal line and is defined along a transverse direction, substantially perpendicular to the longitudinal line, by two side edges opposite one another. The partial casing has a given developed longitudinal length. The partial casing has no fastening to the main casing on at least one longitudinal segment, and the longitudinal segment extends from one side edge to the other and extends in total over a cumulative developed longitudinal length of at least 20% of the given developed longitudinal length.

An exhaust muffler structure to which an exhaust pipe for guiding exhaust gas from an engine to an exhaust muffler is connected, the exhaust muffler structure comprising a catalyst device, included inside the exhaust muffler structure, having a catalyst for purifying the exhaust gas of the engine, wherein the catalyst device has one end connected to the exhaust pipe and is supported inside the exhaust muffler via the exhaust pipe, and a body portion of the catalyst device is supported by a first partition wall having an inner partition wall and an outer partition wall that is on the outer side of the inner partition wall, and the outer partition wall is fixed to the inner wall of the exhaust muffler, and the inner partition wall is fixed to the outer wall of the catalyst device.

In order to further improve the sound damping in a refrigerant compressor comprising a common housing, a screw-type compressor in a common housing has a compressor housing that is formed as part of the common housing with a first sound absorber unit which is arranged in the common housing. The first sound absorber unit is arranged adjacent a housing window, and the sound absorber unit comprises at least one chamber which is located between an inlet opening and an outlet opening and which widens out relative to the inlet opening and to the outlet opening in a direction transverse to a direction of flow.

A mixer element of an exhaust treatment apparatus for an internal combustion engine includes a semi-tube having a closed first end and an open second end. The first end includes a fluid inlet configured for connection to an emission fluid injector of the exhaust treatment apparatus. The semi-tube is configured to induce swirl into an exhaust gas flow across the semi-tube. A plurality of bladed discs are spaced axially apart along a tube axis of the semi-tube. The plurality of bladed discs are configured and positioned to induce a helical component to the exhaust gas flow relative to the tube axis. Each bladed disc includes a plurality of blades extending from a disc hub.

A muffler for a vehicle includes a first expansion chamber in which an exhaust gas flowing in from an inlet pipe is expanded, and a bracket that is placed on an inner surface of the first expansion chamber to oppose a blow-off port of the inlet pipe and that has a mountain shape protruding toward a side of the inlet pipe. The bracket includes a top surface which opposes the blow-off port of the inlet pipe, and inclined surfaces which incline from the top surface toward corners of the first expansion chamber.

Methods and systems are provided for a mixer. In one example, a system may include a mixer arranged in a passage and configured to mix two dissimilar types of gases upstream of a device.

A Helmholtz muffler for a vehicle may include a muffler housing having an internal space divided into a plurality of expansion chamber; a resonance chamber formed hermetically in a vehicle body member; and a connection tube configured to be connected to one of the expansion chambers of the muffler housing and to the resonance chamber.

A modular system for muffler production and assembly allows various muffler designs to be produced from a common set of components. In particular, modular stamped muffler housing components, including two endcap designs and an intermediate body component design, can be assembled in various ways to produce muffler shells of varying length and configuration, while also ensuring high performance of the finished product. Additional components, such as crossover tubes, baffles and manifold pipes, may be integrated into a particular muffler design upon final assembly.

A snap-action valve assembly for an exhaust system is provided with a conduit that defines an exhaust passageway. A valve flap is disposed within the exhaust passageway for controlling exhaust flow. A shaft supports the valve flap in the exhaust passageway and allows the valve flap to rotate between closed and open positions. A mass damper, positioned outside the conduit, includes a longitudinal segment that is rotatably coupled to the shaft and that extends between first and second coiled ends. The longitudinal segment includes an inboard side and an outboard side. The first and second coiled ends include a series of overlapping layers arranged in either a folded serpentine shape or a spiral shape.

A muffler having a movable baffle may include a housing where an input pipe into which exhaust gas is flowed from an engine and an output pipe through which the exhaust gas is expelled to atmosphere are disposed, a baffle which is configured to be slidable along the longitudinal direction of the housing and divides the space of the housing, baffle moving means for moving the baffle to an arbitrary position within a predetermined range along the longitudinal direction of the housing, and a controller which data for determining whether to move the baffle or not is input thereto when the engine is driven, determines whether to move the baffle or not by use of the input data and controls the baffle moving means when the baffle is determined to be moved.