An exhaust gas catalyst system for a vehicle, for treating fine dusts of exhaust gases produced by an internal combustion engine group of the vehicle, having an inlet duct and an outlet duct connectable to the internal combustion engine group and to a diesel particulate filter (DPF) system. A hollow main body extends along a main axis (X-X) between a head wall having an inlet opening and an outlet opening, and a bottom wall and defines a gas treatment chamber having a first chamber fluidically connected to the inlet opening and a second chamber fluidically connected to the outlet opening. The first and second chambers are fluidically connected in a region proximal to the bottom wall so exhaust gases flow in the first and second chambers in opposite directions. Exothermic filtration and oxidation operations are carried out on the fine dusts by a catalyst substrate housed in the second chamber.

A muffler, for an internal combustion engine exhaust system, includes a muffler housing (12) with a housing jacket (14) elongated in a housing longitudinal axis (A) direction and with an outer panel (16) connected to the housing jacket at both axial end areas thereof to define a muffler interior (18). An inner panel (20) is arranged in and divides the muffler interior. A muffling unit (24) includes an exhaust-gas-carrying inner pipe (26), an outer pipe (28) enclosing the inner pipe and muffling material (32) arranged between the inner pipe and the outer pipe. The inner pipe is accommodated in an opening (48) of an inner panel and in an opening (40) of one of the outer panels or of an additional inner panel. The outer pipe is permanently connected to the inner panel or/and to one of the outer panels or to the additional inner panel.

A muffler for an exhaust system of an internal combustion engine includes a muffler housing (14) and at least one exhaust gas pipe group (19). The at least one exhaust gas pipe group (19) includes an outlet pipe (20) open towards an expansion chamber (26) formed in the muffler housing (14). Exhaust gas introduced via the at least one exhaust gas pipe group (19) leaves the muffler housing (16) via the outlet pipe (20). A first inlet pipe (38), of the at least one exhaust gas pipe group (19), has an inlet pipe end area (40), which is inserted into the outlet pipe (20) and extends in the outlet pipe (20). A second inlet pipe (48), of the at least one exhaust gas pipe group (19), is open towards the expansion chamber (26).

An exhaust pipe with a double pipe structure that can reduce generation of a turbulent flow of exhaust gases is provided. In one aspect of the present disclosure, the exhaust pipe includes a double pipe and a retention member. The double pipe includes an inner pipe and an outer pipe. The retention member is disposed in a gap provided between an outer circumferential surface of the inner pipe and an inner circumferential surface of the outer pipe. The retention member is disposed at at least one end of the double pipe. At the end of the double pipe where the retention member is disposed, a radial clearance between the outer circumferential surface of the inner pipe and the inner circumferential surface of the outer pipe at an opening of the inner pipe is smaller than the radial clearance in an arrangement area where the retention member is disposed.

Provided is a tail pipe in which a silencing effect at a discharge port is obtained. One aspect of the present disclosure is a tail pipe including: an inner tube including a discharge port configured such that an exhaust gas is discharged therefrom; an outer tube arranged so as to form a space between the outer tube and the inner tube by surrounding an outer peripheral surface of the inner tube, an upstream end of the outer tube in a flow direction of the exhaust gas being closed; and at least one communication hole allowing communication between an interior of the inner tube and the space.

An internal combustion engine emissions reduction system in which a emissions passing through a second catalyst element having a second catalyst function are mixed with emissions passing through a first catalyst element having a first catalyst function.

A muffler includes a first tube defining a first inlet for receiving exhaust and a first outlet. The muffler includes a housing defining a tuning chamber. The muffler includes a second tube at least partially received within the first tube. Further, the second tube defines a second inlet disposed within the first tube and a second outlet disposed in fluid communication with the tuning chamber. The muffler further includes a muffler outlet for discharging exhaust from the muffler. Moreover, the first tube and the second tube define an annular passage therebetween. The annular passage is disposed in fluid communication with the first outlet of the first tube and the muffler outlet.

A clampless tail pipe assembly may include a base having a longitudinal axis and spring elements spaced about the base. Each spring element may have a body with a first end and a second distal end. The second distal end may comprise a first inner locking tooth. The spring element body may include sequential proximate portions. A first portion may be connected to the base, substantially linear, and substantially parallel to the longitudinal axis. A second portion may be arcuate. A third portion may be substantially linear and substantially parallel to the longitudinal axis. A fourth portion may be angled relative to the longitudinal axis. A fifth portion may be angled relative to the longitudinal axis, and the angle may be different than the angle of the fourth portion relative to the longitudinal axis. A sixth portion may be angled relative to the longitudinal axis.

A tubular member for an exhaust gas treatment device according to at least one embodiment of the present invention includes: a tubular main body made of a metal; and an insulating layer formed at least on an inner peripheral surface of the tubular main body. The insulating layer contains glass containing a crystalline substance, and the glass contains silicon, boron, and magnesium.

A device for exhaust-gas aftertreatment, having a first, tubular flow path, having a diverting region and having a second, annular flow path. The tubular flow path is formed by an inner pipe and the annular flow path is, by an outer pipe running substantially parallel to the inner pipe, formed between the inner pipe and the outer pipe, and the diverting region is designed to divert the exhaust-gas flow from the tubular flow path into the annular flow path. The device has an annular catalytically active substrate body and an annular particle filter, wherein the substrate body and the particle filter are arranged in the annular flow path.