Motor Vehicle Parking Lock Device Having at Least One Locking Element
AssigneeDaimler AG
InventorBernd Pollack
Life of this patent
Estimating the term…
Abstract
A motor vehicle parking lock device has at least one locking element for locking a parking lock piston in a positive-fit manner and a release unit having at least one electromagnetic actuator for releasing the parking lock piston. The release unit has a hydraulic and/or pneumatic actuator acting parallel to the electromagnetic actuator and which releases the parking lock piston at least in the event of a failure of the electromagnetic actuator.
Claims5
1-7. (canceled)
A motor vehicle parking lock device, comprising:
- at least one locking element configured to lock a parking lock piston in a positive-fit manner;
- a release unit having at least one electromagnetic actuator configured to release the parking lock piston, wherein the release unit has a further actuator acting parallel to the electromagnetic actuator and which is configured to release the parking lock piston at least in an event of a failure of the electromagnetic actuator, wherein the further actuator is a hydraulic or pneumatic actuator;
- a single-acting actuating cylinder configured to switch the parking lock piston into a non-parking position;
- a spring configured to switch the parking lock piston into a parking position;
- an operating medium pressure supply;
- and
- a switching valve having a first and second valve position, which when fluidically connects the hydraulic or pneumatic actuator to the operating medium pressure supply configured in the first valve position, and fluidically connects the actuating cylinder to the operating medium pressure supply when configured in the second valve position.
A method for releasing a parking lock piston of a motor vehicle parking lock device, wherein a parking lock piston is releasable by an electromagnetic actuator or by a hydraulic or pneumatic actuator, the method comprising:
- releasing a parking lock piston locked in a non-parking position by the hydraulic or pneumatic actuator;
- and
- releasing a parking lock piston locked in a parking position by the electromagnetic actuator.
Dependencies are inferred from the claim text.