Sheathed exhaust pipe of an exhaust system of an internal combustion engine, in particular a motor vehicle, in which an air duct of an air cooling device for cooling the exhaust pipe is formed between the casing and the exhaust pipe

摘要

The invention relates to a jacketed exhaust pipe of an exhaust system of an internal combustion engine - in particular a motor vehicle - in which an air duct of an air cooling device for cooling the exhaust pipe is formed between the jacket and the exhaust pipe, in which at least in a partial area in the longitudinal direction of the exhaust pipe, both the exhaust pipe and the air duct the inside and the casing on its inside, which radially outwardly delimits the air duct, each having a surface which has a radiation coefficient epsilon for the radiation between the two surfaces, for which: epsilon = 0.8.