Patent ID: 7080614

Claim:
Hydraulically actuated variable valve drive of an internal-combustion engine, comprising a housing ( 3 ) installed in a receptacle ( 1 ) of a cylinder head ( 2 ), the housing includes a bore hole ( 4 ) in which an axially moveable slave piston ( 5 ) is located, the slave piston includes on one end ( 6 ) a pressure chamber ( 7 ) for the hydraulic medium and on an other end ( 8 ) has a hydraulic backlash compensation element ( 9 ) with a non-return valve ( 9 a ), the backlash compensation element ( 9 ) is adapted to act at least indirectly on a gas-exchange valve ( 11 ) on a side ( 10 ) of the compensation element away from the housing, wherein the housing ( 3 ) is sectioned by at least one path ( 12 ) for hydraulic medium, with the path being connected to a channel ( 13 ) of the slave piston ( 5 ) or the backlash compensation element ( 9 ) for further guidance of the hydraulic medium to a reservoir ( 14 ) of the backlash compensation element ( 9 ) directly in front of the non-return valve ( 9 a ), the housing ( 3 ) installed in the cylinder head ( 2 ) is produced as a separate component for forming only one slave unit ( 15 ), the channel ( 13 ) is connected hydraulically to the path ( 12 ) only outside of a stroke phase of the slave piston ( 5 ), and the backlash compensation element ( 9 ) and the slave piston ( 5 ) form materially separate units, which border each at the most on axially adjacent ends thereof, wherein the backlash compensation element ( 9 ) comprises a pressure piston ( 19 ) with the non-return valve ( 9 a ) and with the reservoir ( 14 ) and a housing ( 22 ) with a bore hole ( 21 ), within which the pressure piston ( 19 ) runs.