Manufacture of exhaust gas treatment device for internal combustion engine for motor vehicle entails reducing cross section of casing in direction from insert region to funnel region

摘要

The method is for the manufacture of an exhaust gas treatment device for an internal combustion engine, wherein the casing (2) undergoes a cross section reduction in such a way that the casing in a region (9) in which is located an exhaust gas treatment insert (3), internally has a first end cross section (13) which is as large as the outside cross section (10) of the insert, and in a region (8) in which is located a funnel (4), internally has an end cross section (14) which is as large as the outside cross section (11) of the funnel. An independent claim is included for an exhaust gas treatment unit for an internal combustion engine.