Ventileinstellsteuersystem for internal combustion engines

A Ventileinstellsteuersystem for an internal combustion engine comprises a housing, which is provided with a main body and an attached cover, a phase adjusting mechanism, which is accommodated in the housing in order to hydraulically change the rotational phase of a crankshaft and a camshaft, a supply / drain rod which extends through a through hole of the cover, and is connected to the phase adjustment mechanism, a sealing ring which is in engagement with the supply / drain rod to hermetically seal a gap between the supply / discharge rod and the phase adjustment mechanism, a tapered surface is provided on the periphery of the through hole so that the diameter of the through hole to the outside of the housing increases, and so that it projects a projection which is provided in the cover in its region radially inside in the axial direction of the system, wherein the through hole at the projection is provided.