Valve seat for intake duct, heat engine cylinder head and manufacturing method

摘要

The insert (3) has a transition zone (3b) provided on a border (3a) that is aligned on a hot surface of a cylinder head of a heat engine of a motor vehicle. The zone is shifted towards a cylinder sector (3c). The sector follows a surface (3d) that is inclined towards the top and the center of a pipe and is terminated by a sharp edge (3e). The surface (3d) follows a surface (3f) that is inclined towards the top and exterior of the pipe. The edge (3e) forms an acute angle whose peak is oriented towards the center of the pipe. An independent claim is also included for a method of manufacturing a cylinder head of a heat engine.