Patent ID: 7146953

Claim:
A mechanical valve play compensation element for a valve drive on a piston combustion engine, having a first pressure part ( 1 ), which is axially displaceable relative to a second pressure part ( 2 ) and is held rotatably about the displacement axis, and having a torsion spring element ( 10 ), operative between the first pressure part ( 1 ) and the second pressure part ( 2 ), that is axially resilient at least to a limited extent, and further having at least one helical surface ( 9 . 1 ) on the first pressure part ( 1 ), with which surface a corresponding helical surface ( 9 . 2 ) on the second pressure part ( 2 ) is associated, the two forming a pair ( 9 ) of helical surfaces, wherein the surfaces of the pair ( 9 ) of helical surfaces are embodied as rough surfaces and are pressed against one another by the torsion spring element ( 10 ), the rough surfaces preventing the pressure parts from rotating against one another in an open stroke, a chamber ( 7 . 1 , 10 . 3 ) is surrounded by the pressure parts ( 1 , 2 ), and at least one ventilation bore is provided for the chamber.