Exhaust gas treatment system for an internal combustion engine

摘要

An exhaust gas treatment device comprises exhaust gas catalysts each supported by a cylindrical catalyst support body (42), a number of groups of tube flanges (17), each provided for coupling to one or more exhaust gas ejection openings (9), and a number of catalyst holding tubes (27) having a first tube region (31) for receiving a catalyst support body. Each catalyst holding tube is coupled to the tube flange of each group of tube flanges via a tube branch. Preferred Features: The catalyst holding tube further comprises a second tube region (39) connected to the first tube region for removing exhaust gas treated in the catalyst support body. The first tube region has a larger inner diameter (D1) than the second tube region. The cross-section of the catalyst support body is the same as or larger than the cross-section (D2) of the second tube region. The first and second tube regions are formed as a one-piece unit.