Exhaust gas pipe with catalyst carrier body exposed to a helical flow

摘要

An exhaust gas pipe includes a plurality of segments forming at least one angular bend which preferably includes an angle of approximately 90 DEG . The segments include a first segment having a given diameter. An adaptor communicates with the first segment. A second segment communicates with the adaptor and has a diameter larger than the given diameter. A honeycomb body is disposed directly downstream of the adaptor and has a side with an end surface facing towards an exhaust gas flow. The adaptor may have a shape forcing exhaust gas to approach the end surface in a helical and/or spiral path having a curvature and pitch reducing or preventing contact between exhaust gas having already been deflected and exhaust gas newly flowing into the adaptor. The adaptor may have an inside with approximately the shape of a coiled and/or spiral tubing segment approaching the end surface and being cut open in direction toward the end surface.