A muffler for receiving exhaust gas from a combustion engine may include a shell, an inlet pipe, at least one outlet pipe, one or more baffles, and an internal communication pipe. The inlet pipe may extend through the shell. The outlet pipe may be in fluid communication with the inlet pipe and may be at least partially disposed within the shell. The baffles are disposed within the shell and cooperate with the shell to define a plurality of chambers. The internal communication pipe may be disposed entirely within the shell and may be in fluid communication with the inlet pipe. The internal communication pipe may include an inlet opening and first and outlet openings. The first outlet opening is open to and in direct fluid communication with one of the chambers. The second outlet opening is open to and in direct fluid communication with another one of the chambers.

A muffler may include a shell, first and second baffles, an inlet pipe, first and second outlet pipes, and a communication pipe. The first and second baffles cooperate with the shell to define first, second and third chambers. The first inlet pipe may extend through the shell and may provide exhaust gas to at least one of the first and second chambers. Exhaust gas in the first chamber exits the muffler through the first outlet pipe. Exhaust gas in the second chamber exits the muffler through the second outlet pipe. The communication pipe may include first, second and third openings. The first opening is in communication with the first chamber. The second opening is in communication with the second chamber. The third opening is in communication with the third chamber. The first and second chambers may be in communication with the third chamber through the communication pipe.

An exhaust pipe includes a first end, a second end, and a wall connecting the first end to the second end. The first end has a first opening, and the second end has a second opening that fluidly communicates with the first opening to define a bore. The wall includes an inner curved second and an outer curved section that includes an indentation. The indentation includes a first inwardly extending part and a second inwardly extending part. The second inwardly extending part includes a through hole having an inner opening and an outer opening. The inner opening is located between the outer opening and the second opening. A diameter of the outer opening is less than a diameter of the inner opening. A thickness of the second inwardly extending part is less than the diameter of the outer opening.

A heating apparatus for an exhaust train comprises a flow-conducting device for guiding an exhaust gas flow along a flow path; a burner that is arranged outside the flow-conducting device and that is configured to generate heating gases during the combustion of a fuel; and a supply device that is configured to supply the heating gases generated by the burner to the exhaust gas flow, which is guided through the flow-conducting device, via a heating gas inlet that is formed in a wall of the flow-conducting device. The supply device has a channel that is fastened to an outer side of the flow-conducting device in a manner covering the heating gas inlet and open towards it, wherein the channel extends along a peripheral direction running around the flow path and in so doing engages around the flow-conducting device while forming an interruption.

An insert assembly unit for a muffler of an exhaust system of an internal combustion engine includes two walls (12, 14) arranged at spaced locations from one another. Each of the two walls has a circumferential edge area (20, 22) configured for fixing at a circumferential wall of a muffler. An exhaust gas flow unit (26) is arranged between the two walls. The exhaust gas flow unit includes a flow duct area (34) with an exhaust gas outer flow opening (38) to be positioned directed towards an opening in a circumferential wall of a muffler, a first mounting duct area (40) with a first mounting opening (44) for fixing the exhaust gas flow unit at a first wall of the walls, and a second mounting duct area (42) with a second mounting opening (46) for fixing the exhaust gas flow unit at a second wall of the walls.

An exhaust device includes a housing, first and second pipes, and a spacer. The first and second pipes are at least partially disposed within the housing. The first and second pipes include respective first and second surfaces. A portion of the second pipe is disposed inside the first pipe. The first and second surfaces cooperate to define an annular volume into which the spacer is disposed to prevent direct communication between the first and second pipes. One of the first and second pipes is fluidly connected to an exhaust gas inlet. The other of the first and second pipes is fluidly connected to an exhaust gas outlet. One of the first and second surfaces defines a radial indentation. The other of the first and second surfaces defines a radial protrusion. The spacer is disposed at least partially within the radial indentation and is in direct communication with the radial protrusion.

A mixer for an exhaust system of an internal combustion engine includes a mixer housing (40) with an inflow opening central axis (LE) and with an outflow opening (38). A first flow duct (48) following the inflow opening (24) in the mixer housing (40) and a second flow duct (50) lead parallel to one another to a third flow duct (54) and open into same. The third flow duct (54) leads to the outflow opening (38). The first flow duct (48) and the second flow duct (50) are provided between an outer wall (16) of the mixer housing (40) and a flow divider wall (36) enclosed by the outer wall (16), and the third flow duct (54) is enclosed by the flow divider wall (36).

A catalytic converter includes a housing and a catalyst carrier disposed in a receiving chamber of the housing. The housing has an inlet opening and at least two outlet openings. The inlet opening is formed in an inlet wall which completely seals the receiving chamber, except for the inlet opening, in a direction running parallel to a main direction of flow and pointing away from the at least two outlet openings and the inlet wall extends in a plane running perpendicular to the main direction of flow. The at least two outlet openings are formed in an outlet wall which completely seals the receiving chamber, except for the at least two outlet openings, in a direction running parallel to the main direction of flow and pointing away from the inlet opening and the outlet wall extends in a plane running perpendicular to the main direction of flow.

A spray/gas mixer includes a main body having a circumferential wall defining an inlet opening at one end and an outlet opening at another end; a divider baffle within the main body; a swirl duct having a first end adjacent to the wall and a second end extending to the divider baffle; an injector orifice at the first end of the swirl duct; a swirl promoting means; and a restrictor. The swirl promoting means is arranged between the divider baffle and the restrictor. Gas passing through the swirl promoting means is swirled around the first longitudinal axis (A) before passing through the restrictor. The restrictor is disposed between the swirl promoting means and the second end, forcing gas reaching it from an upstream side away from a peripheral region of the interior towards a center axis of the main body.

An end can assembly for an engine exhaust aftertreatment canister comprises an end can formed from an end plate and a wall extending from a periphery of the end plate, the end plate and the wall having a first cutaway portion formed therein. A pipe is provided in the first cutaway portion and attached to the end can around the first cutaway portion to form a seal with the end can, the pipe having at least one opening provided therein which opens into an interior of the end can assembly. A bracket, comprising a plate and a shoulder extending at an angle from the plate, is attached to the end plate and to the wall, the shoulder having a second cutaway portion formed therein which is shaped to receive the pipe whereby the shoulder abuts the pipe and provides structural support to the pipe and end can.