Patent ID: 8555833

Claim:
A valve clearance compensating device for a valve ( 16 ) of an internal combustion engine, comprising: an external part ( 14 ) having a guide duct ( 12 ), an internal part ( 10 ) which is arranged slidably within the guide duct ( 12 ) of the external part ( 14 ) at least along a longitudinal section of the guide duct ( 12 ) and is movable along the guide duct ( 12 ) in order to provide for the clearance of an associated valve ( 16 ) of the internal combustion engine, the clearance compensating device further including a pressure chamber ( 18 ), and a storage chamber ( 20 ) which are hydraulically interconnected with a one-way valve ( 22 ) disposed therebetween and which are associated with the internal part ( 10 ), a clearance compensating element ( 24 ), by means of which an actuating force can be applied to the internal part ( 10 ) for valve lash adjustment, and a supply device ( 28 ), which is hydraulically connected to a blocking chamber ( 30 ) and by means of which hydraulic fluid can be supplied to the blocking chamber ( 30 ) for exerting a blocking force against the actuating force to the internal part ( 10 ), the supply device ( 28 ) comprising a timing device ( 38 ) for modifying the blocking force in dependence on a cycle of the timing device ( 38 ) so as to prevent lash adjustment when the valve ( 16 ) is opened by the exhaust gas counter pressure in an exhaust pipe.