Patent ID: 6274099
Filing Date: 2001-08-14
Classification: F01N

Abstract:
A device for catalytic conversion of exhaust gases in an exhaust system, comprising:a housing containing a catalyst carrier body formed of wound layers of sheet metal and having an exhaust gas inlet region, an exhaust gas outlet region, an outer annular region, an inner region and channel walls defining a multiplicity of channels with free flow cross-sections through which an exhaust gas can flow in a given direction;said channel walls in said outer annular region and said housing being deformed together by a plastic deformation while said channel walls are in said housing, thereby, effecting a superior positioning and fixation of said catalyst carrier body within said housing without a need for a collar or end rings, said channels in said outer annular region being completely closed in the vicinity of said exhaust gas inlet region and in the vicinity of said exhaust gas outlet region by one of the plastic deformation and coating material, said completely closed channels forming a thermally insulating region due to an atmosphere in said completely closed channels.