Patent ID: 8745976

Claim:
A device for cooling an exhaust gas stream, having an exhaust gas pipe receiving the exhaust gas stream, an outer diametrical surface of the exhaust gas pipe being surrounded at least in places radially outward by a heat shield arranged spaced therefrom, which together with the outside of the exhaust gas pipe forms a convection region for an ambient air supplied, at atmospheric pressure, from the surrounding environment, characterized in that a mouth region of the exhaust gas pipe, extended relative to the heat shield, projects in such a way into an open end of an adjoining outlet port that a reduced pressure relative to the surrounding environment is produced in a suction region between the mouth region of the exhaust gas pipe and the outlet port as the ambient air heated in the convection region due to the exhaust gas stream rises, the outlet port being positioned downstream of the heat shield and overlapping the exhaust gas pipe, the exhaust gas pipe having an internal diameter remaining the same over the mouth region, and the outlet port is arranged axially spaced from the heat shield in such a way that opposing end regions of the outlet port and of the heat shield form an annular suction opening connected with the suction region.