Patent ID: 6595318
Filing Date: 2003-07-22
Classification: F01N

Abstract:
A double-wall tail pipe for an exhaust pipe of a motor vehicle exhaust system comprising: an inner shell for mounting onto said exhaust pipe at one end thereof, an outer shell ex-tending around, and being supported on, said inner shell in spaced relationship therefrom so as to form between said inner and outer shells an annular air space for air to flow therethrough for cooling said outer shell, a support structure provided with air passages and being disposed in said air space for supporting said inner and outer shells in spaced relationship from each other, said support structure being disposed in an area of said inner shell adjacent the end portion of said inner shell, which is seated on said exhaust pipe when said tail pipe is mounted on said exhaust pipe, said air passages in said support structure forming air inlet openings for directing air into the annular air space and said outer shell being bent inwardly at its end to form a curved end structure and said inner shell ending in axially spaced relationship from said curved end structure of said outer shell so as to form a flow gap between the end of said inner shell and said curved end structure through which a cool air flow leaves said annular air space while enveloping the exhaust gas being discharged through said inner shell thereby maintaining said curved end structure cool and free from deposits.