An engine exhaust device includes an exhaust pipe attached to a vehicle engine and a silencer connected to a downstream side of the exhaust pipe; the silencer includes a first partition wall which partitions an internal space of the silencer into at least two spaces in a first direction and a second partition wall which partitions one of the at least two spaces into two spaces in a second direction that crosses the first direction; another one of the at least two spaces is larger in capacity than each of the two spaces defined by the second partition wall; and a downstream end of the exhaust pipe is open in the another one of the at least two spaces.

An exhaust gas sensor mounting structure includes: an exhaust pipe attached to a vehicle engine; a catalyst unit which cleans exhaust gas of the engine; a silencer connected to a downstream portion of the exhaust pipe; and an exhaust gas sensor which detects a prescribed component of the exhaust gas; at least part of the catalyst unit is located in the silencer; at least part of a pipe that is connected to a downstream end portion of the catalyst unit extends alongside an outer surface of the silencer; and the exhaust gas sensor is attached so as to penetrate through an outer wall of the silencer and a wall of the pipe.

Problem: The objective of the present invention is to provide a technique to enable more accurate measurement of oxygen contained in an exhaust gas in an exhaust device provided with an oxygen sensor.

Solution: A catalyst which cleans the exhaust gas is provided in an exhaust pipe in an exhaust device that includes a muffler coupled downstream of the exhaust pipe, and an oxygen sensor is mounted on a pipe portion that is disposed downstream from the catalyst and that is directly coupled to the catalyst. The oxygen sensor is provided substantially perpendicular to the axial direction of the pipe portion through which the exhaust gas flows. The oxygen sensor includes a detecting portion, the detecting portion is disposed in a recessed portion formed in the muffler, and a wire is disposed on an outer side of the recessed portion.

An assembly for an exhaust system comprises a housing having a jacket, an insert arranged in the interior of the housing and having at least one exhaust pipe, wherein the jacket has an opening, in particular a radial opening, through which the exhaust pipe is connectable to the exhaust system, wherein an adapter part is provided that is connected to the exhaust pipe, and wherein the adapter part has a contact section that contacts the inner side of the jacket around the opening.

An optimized structure for an integrated catalytic muffler is provided to purify exhaust gas from an engine and reduce noise when the exhaust gas flows to the rear of a vehicle. The structure includes a case having an inlet and an outlet, and an SCR catalytic unit that is mounted to the case. Particularly, a portion of the SCR catalytic unit is inserted into the case and the remaining portion is exposed out of the case. The SCR catalytic unit is coupled to the case by bolting or clamping. Accordingly, the production cost and weight are reduced, and maintenance and repair are facilitated.

An exhaust system for an internal combustion engine, configured to enhance a silencing effect while being miniaturized. The exhaust system includes a muffler body configured in such a manner that a first expansion chamber and a second expansion chamber separated from each other are partitioned therein. A plurality of exhaust pipes extend from an internal combustion engine and are connected to the first expansion chamber. A communication pipe is configured to be connected to the first expansion chamber and the second expansion chamber, to merge exhaust gas from the plurality of exhaust pipes, and to introduce the merged exhaust gas into the second expansion chamber.

An exhaust muffler device for an combustion engine includes: a first expansion chamber into which exhaust gas from a combustion engine flows; a second expansion chamber disposed downstream of the first expansion chamber; a resonance chamber that is disposed adjacent to the first expansion chamber and communicates with an exhaust passage; a discharge passage through which the exhaust gas that flows into the resonance chamber is discharged to the outside; and an exhaust valve disposed in a second partition wall between the first expansion chamber and the resonance chamber. The exhaust valve opens when pressure in the first expansion chamber attains a value greater than a predetermined value.

An engine-exhaust-system apparatus includes: a main body that reduces noise generated by exhaust gas; and an exhaust outlet tube that includes an insertion section inserted into the main body, exhaust gas in the main body being discharged outside via the exhaust outlet tube, wherein the insertion section has an open end with a brim portion that spreads beyond a tube diameter of the insertion section.

A muffler includes a shell, baffles, and a plurality of pipes. The shell defines first and second end cavities and a central cavity. The end cavities have larger cross-sectional areas that a cross-sectional area of the central cavity. The baffles cooperate to form multiple chambers within the shell. A first inlet directs a first portion of the exhaust into a first chamber. A second inlet directs a second portion of the exhaust into a second chamber. A first pipe extends through first, third and fourth baffles and includes an inlet in the fourth chamber. The first pipe directs exhaust from the fourth chamber to a first outlet at the first end cavity. A second pipe extends through the second, third and fourth baffles and includes an inlet in the third chamber. The second pipe directs exhaust from the third chamber to a second outlet at the second end cavity.

An optimized structure for an integrated catalytic muffler is provided to purify exhaust gas from an engine and reduce noise when the exhaust gas flows to the rear of a vehicle. The structure includes a case having an inlet and an outlet, and an SCR catalytic unit that is mounted to the case. Particularly, a portion of the SCR catalytic unit is inserted into the case and the remaining portion is exposed out of the case. The SCR catalytic unit is coupled to the case by bolting or clamping. Accordingly, the production cost and weight are reduced, and maintenance and repair are facilitated.