Patent ID: 7568460
Filing Date: 2009-08-04
Classification: F01L,Y10T

Abstract:
1. A variable valve drive of an internal combustion engine for actuating a gas-exchange valve, whose movement follows a lift of a cam, comprising a hydraulic force applying device having a lift that is superimposed on the lift of the cam and which is independent of the lift of the cam, the hydraulic force-applying device including a piston which is connected to a hydraulic medium line with adjustable hydraulic medium pressure and a pressure chamber at least indirectly pressurizing the piston and also a hydraulic valve lash compensating device with a work chamber radially limited by a housing, wherein the housing is used simultaneously for radial limiting of the pressure chamber, and the pressure chamber is limited axially by the piston and a first end side of a compensating piston of the valve lash compensating device that faces the piston and is guided so that it can move longitudinally in the housing, a second end side of the compensating piston facing away from the piston axially limits the work chamber of the valve lash compensating device separated from the pressure chamber.