Exhaust gas housing of a thermal engine

In an exhaust gas housing of a thermal engine, a radially outer housing casing and a radially inner housing casing arranged on the hub side are connected to one another via at least one thermally insulated carrying rib acted upon by a cooling medium. A carrying rib has at least two passage ducts and for the cooling medium, at least one passage duct possessing a cooling medium supply and at least one passage duct possessing a cooling medium outlet, and these passage ducts and being in communicating connection in the radially inner hub-side end region via a deflection duct. The cooling medium is led from an external pressure source through the carrying rib to the region of the deflecting duct arranged on the hub-side casing and from there through the carrying rib back again into a collecting duct which issues preferably into an annular duct for cooling the exhaust gas housing flange.