Patent ID: 8056533
Filing Date: 2011-11-15
Classification: F01L

Abstract:
1. A gas exchange valve actuating device for transmitting a drive movement of an actuator to at least one gas exchange valve ( 10 a ) of an internal combustion engine including an internal combustion engine braking unit ( 11 a ; 11 b ; 11 c ; 11 d ; 11 e ) having at least one actuator means ( 12 a ; 12 b ; 12 c ; 12 d ; 12 e ), said gas exchange valve actuating device comprising a locking unit ( 13 a ; 13 b , 13 c ; 13 d ; 13 e ) for locking the actuator ( 12 a ; 12 b ; 12 c ; 12 d ; 12 e ) counter to an opposing force ( 14 a ; 14 b ; 14 c ; 14 d ; 14 e ) when the actuator ( 12 a ; 12 b ; 12 c ; 12 d ; 12 e ) has reached a specific position, the actuator ( 12 a ; 12 b ; 12 c ; 12 d ; 12 e ) comprising a hydraulically operable actuator piston, the locking unit ( 13 a ; 13 b , 13 c ; 13 d ; 13 e ) being a hydraulic unit operated by a hydraulic pressure medium supplied to a pressure space ( 28 a , 28 b , 28 c , 28 d , 28 e ) below the actuator ( 12 a , 12 b , 12 c , 12 d , 12 e ) and the locking unit ( 13 a ; 13 b , 13 c ; 13 d ; 13 e ) having at least one bypass ( 15 a ; 15 b ; 15 c ; 15 d ; 15 e ) which is open for discharging the hydraulic pressure medium until the actuator ( 12 a ) reaches a specific position wherein the bypass is closed or ineffective so that the actuator 12 a is locked in the specific position.