An exhaust gas heating system is provided, comprising a first end face, a second end face, a plurality of honeycomb segments, and a plurality of electrically nonconductive layers. Each honeycomb segment comprises an array of intersecting walls forming channels extending axially between the first end face and the second end face. The intersecting walls comprise an electrically conductive material. The heater further comprises a plurality of electrically nonconductive layers arranged between adjacent segments of the honeycomb segments. The arrays of intersecting walls of the honeycomb segments are electrically isolated from each other by the nonconductive layers. The exhaust gas heating system further comprises a coil wrapped around an external surface of the heater arranged between the first end face and the second end face. The exhaust gas heating system further comprises a DC to AC converter configured to supply the coil with an AC current.

A gas processing device is disclosed that makes it possible to appropriately control the frictional resistance between a holding mat and a casing. A gas processing device (1) includes a processing structure (20), a casing (40) made of a metal and housing the processing structure (20), and a holding mat (10) formed of inorganic fibers and placed between the processing structure (20) and the casing (40), an inner surface (41) of the casing (40) and an outer surface (11) of the holding mat (10) coming in contact with each other through an adhesive layer (12) that includes a compound that includes a structural unit represented by a general formula (I). ##STR00001##
wherein R.sup.1 are independently a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, a phenyl group, or a hydroxyl group, and n is an integer equal to or larger than 1.

A catalytic converter for exhaust gas aftertreatment, with a matrix and a casing, the matrix is formed from a coiled layered stack of metal sheets and is inserted into the casing and bonded thereto only in portions and a method for producing a catalytic converter.

A support assembly supports an exhaust gas treatment element of an exhaust gas treatment unit for an exhaust gas system of an internal combustion engine. A carrying body is secured on a housing of an exhaust gas treatment unit and surrounds an assembly center axis as a ring or annulus. At least one flexible supporting element is carried on the carrying body. The supporting element has an exhaust gas treatment element supporting side for supporting interaction with an exhaust gas treatment element. The carrying body has a radial limb at least partially engaging radially over the supporting element on a carrying body supporting side facing away from the exhaust gas treatment element supporting side. The supporting element is supported by the carrying body supporting side thereof on the radial limb so as to be shiftable radially inward with respect to the carrying body.

A support assembly supports an exhaust gas treatment element of an exhaust gas treatment unit for an exhaust gas system of an internal combustion engine. A carrying body is secured on a housing of an exhaust gas treatment unit and surrounds an assembly center axis as a ring or annulus. At least one flexible supporting element is carried on the carrying body. The supporting element has an exhaust gas treatment element supporting side for supporting interaction with an exhaust gas treatment element. The carrying body has a radial limb at least partially engaging radially over the supporting element on a carrying body supporting side facing away from the exhaust gas treatment element supporting side. The supporting element is supported by the carrying body supporting side thereof on the radial limb so as to be shiftable radially inward with respect to the carrying body.

A connector includes a thermally conductive body defining a passage for a fluid to flow through a duct and configured with an electric heating apparatus situated around the passage. A clip is situated around a portion of the body including one or more snap-in receptacles situated peripherally with respect to the body and configured to fit an electric connection of the electric heating apparatus.

A connector includes a thermally conductive body defining a passage for a fluid to flow through a duct and configured with an electric heating apparatus situated around the passage. A clip is situated around a portion of the body including one or more snap-in receptacles situated peripherally with respect to the body and configured to fit an electric connection of the electric heating apparatus.

A catalytic converter for exhaust gas aftertreatment, with a matrix and a casing, the matrix is formed from a coiled layered stack of metal sheets and is inserted into the casing and bonded thereto only in portions and a method for producing a catalytic converter.

A sound generation assembly unit, for an exhaust system of an internal combustion engine, includes a sound generation module (16) with a sound generation module housing to be arranged at an exhaust gas guide element (12) of the exhaust system (14). At least one loudspeaker unit (20) is arranged in the sound generation module housing (18). A rear volume module (30) includes a rear volume module housing (32) and a rear volume (34) formed in the rear volume module housing (32). The rear volume module housing (32) is connected or can be connected to the sound generation module housing (18) for the acoustic coupling of the rear volume (34) to the at least one loudspeaker unit (20).

An exhaust gas pressure tube assembly and a method for making the tube are disclosed. The assembly includes a keyed washer having a concave conical opening and an exhaust gas pressure tube having an open end for attachment to the boss. The assembly method includes positioning the washer adjacent the boss attachment open end of the pressure tube such that the concave conical opening of the washer faces the open end. A tool is positioned against a washer side and a mandrel having a conical outer surface is then inserted into the open end, causing the open end to be flared against the opening of the washer. The surface of the concave conical opening of the washer may be either smooth or knurled. If the surface is smooth, the mandrel is retained in its flaring position and a brazing or similar procedure to form a strong and gas-tight seal.