Joint flanges for assembling exhaust gas circulation duct and exhaust manifold of diesel engine, has joint surface comprising unhook that is placed at another unhook of duct when surfaces of duct and flanges are in contact with each other

摘要

The flanges (27) has a joint surface (31) comprising an unhook (32) that is placed at another unhook (15) of an end of an one of the exhaust gas circulation ducts (1) of an internal combustion engine when a joint surface of the end of the duct of the internal combustion engine and the joint surface of the flanges are in contact with each other. A tubular part (28) is prolonged toward a junction zone (26) by a collar (29) that comprises an external annular surface with an inclined flat part (30).