Patent ID: 7140483

Claim:
A parking lock of a transmission, said parking lock comprising a parking lock wheel arranged concentrically with a central axis of a shaft while being fixed against axial and rotational movement relative to the shaft but rotatable with the shaft about the central axis of the shaft relative to a housing, a locking ring arranged concentrically with the central axis of the shaft for axial movement relative to the shaft and the housing but fixed against rotation about the central axis relative to the housing, an engaging element and a release element, the locking ring being able to be displaced axially by the engaging element into a positive locked connection with the parking lock wheel, so that the shaft can be locked relative to the housing against rotation about the central axis and the locking ring can be axially released out of the locked connection by the release element wherein the engaging element is at least one spring that biases the locking ring axially against the release element which is a piston that can be actuated by a hydraulic pressure medium, the locking ring can be disengaged axially from the locked connection through the piston actuated by the pressure medium so that the locking ring can be displaced against the biasing force of the spring, the parking lock wheel comprises a first locking gearing and the locking ring comprises a second locking gearing that is oriented toward the first locking gearing and corresponds to the first locking gearing, and the locked connection can be established by an engagement of the second locking gearing into the first locking gearing, the first locking gearing is configured continuously about the central axis on an outer periphery of the parking lock wheel, and the second locking gearing extends about the central axis on an inner periphery of the locking ring.