Patent ID: 8667859

Claim:
A parking position lock shifting device of a motor vehicle having a hydraulic shifting unit ( 10 ), designed to be operable by a hydraulic fluid at a shifting pressure generated by a drive unit ( 14 ) that is operable separately from an internal combustion engine ( 12 ) of the motor vehicle, the shifting unit ( 10 ) having a hydraulic actuator ( 22 ) with a piston rod ( 46 ) having two locking positions ( 18 , 20 ) and a locking unit ( 16 ), comprising: an electromagnetically operated lift gate ( 50 ) for engaging in either of the two locking positions ( 18 , 20 ) of the piston rod ( 46 ) for locking the hydraulic actuator ( 22 ), one of the locking positions ( 20 ) being associated with a drive position and the other locking position ( 18 ) being associated with a parking position, the piston rod ( 46 ) being biased by a spring ( 52 ) toward the parking position, so as to permit movement of the piston rod into the parking position even when no hydraulic fluid pressure is available, the lift gate locking unit ( 16 ) being designed so that it can be overcome hydraulically in order to permit shifting into the parking position upon failure of the lift gate ( 50 ) when sufficient hydraulic operating is available.