Actuator Device For Actuating a Locking Mechanism

An actuating device (1) for operating a parking-lock mechanism of a drive train of a vehicle having an automatic transmission, the parking-lock mechanism comprising:

• at least one piston unit (4), which is arranged in a housing (3) and is axially displaceable in an opening direction to disengage the parking-lock mechanism and in a closing direction to engage the parking-lock mechanism;
• a spring mechanism (2) biases the piston unit (4) which biases the parking-lock mechanism to a closed state against a pressurized fluid, which biases the piston unit (4) in and open direction;
• a detent element (5), when an axial position of the piston unit (4) is equivalent to an open state of the parking-lock mechanism, is automatically activated to retain the piston unit (4) in the axial position equivalent to the open state of the parking-lock mechanism;
• an electromagnetic operating device (6) for operating a release element (7), which deactivates the detent element (5);
• the piston unit (4) is functionally connected to an emergency unlocking mechanism (14), which biases the piston unit (4) into the axial position equivalent to the open state of the parking-lock mechanism,
• the detent element (5), the piston unit (4), and the release element (7) interact such that the parking-lock mechanism remains open and the electromagnetic operating device (6) is without electric current,
• a fluid pressure is applied to the piston unit (4) to provide a force component to bias the piston unit (4) which biases the parking-lock mechanism in the opening direction, the force component being smaller than a release force of the parking-lock mechanism;
• and
• an emergency unlocking mechanism (15) is provided to deactivate the detent element (5).