Parking lock for the automatic transmission of motor vehicles
AssigneeZF Friedrichshafen AG
InventorJosef Haupt
Life of this patent
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Abstract
Parking lock which on the basis of an actuating signal triggered by the driver via an actuating device is engaged and disengaged by the fact that a piston (6) causes a detent disc (2) to rotate in such a way that, via a connection (19), a lock (17) is actuated which engages or disengages the parking lock. When engaged, the parking lock can be unlocked via a manual actuating device (13) causing an emergency release disc (3) to rotate by the fact that a bolt (4) likewise causes the detent disc (2) to rotate and then engages a detent unit (14) which maintains the parking lock in unlocked state. By repeated application of a hydraulic force to the actuating device (7) the detent unit (14) can be automatically disengaged by the detent disc (2) being caused to rotate.
Claims7
A parking lock for an automatic transmission of a motor vehicle, comprising:
- an actuating signal, triggered by a driver via a hydraulic actuating device (7), for one of blocking and releasing the automatic transmission;
- a parking pawl (16) movable via a rotatable fixture (1);
- the fixture (1) comprising, in combination with the hydraulic actuating device (7),:
- a first disc (2);
- a second disc (3);
- and
- a detent unit (14);
- the hydraulic actuating device comprising:
- a piston (6);
- a cylinder (8);
- and
- one recoil spring (9);
- and
- the parking pawl (16) being one of movable manually from a vehicle space, via an operating connection, and hydraulically movable via the actuating device (7);
- wherein the parking pawl (16) is moved to one of:
- (a) a disengaged state by a rotation in a first direction of the fixture (1) around a central axis (20), by a first pressurized shifting of the hydraulic actuating device (7), and, at the same time, bringing the detent unit (14) to an open state;
- and (b) is moved to an engaged state by a rotation in a second opposite direction of the fixture (1) around the central axis (20), by a second pressureless shifting of the hydraulic actuating device (7).
A parking lock for an automatic transmission of a motor vehicle, comprising:
- an actuating signal, triggered by a driver via a hydraulic actuating device (7), for one of blocking and releasing the automatic transmission;
- a parking pawl (16) movable via a rotatable fixture (1);
- the fixture (1) comprising, in combination with the hydraulic actuating device (7),:
- a first disc (2);
- a second disc (3);
- and
- a detent unit (14);
- the parking pawl (16) being one of movable manually from a vehicle space, via an operating connection, and hydraulically movable via the actuating device (7);
- wherein the parking pawl (16) is moved to one of:
- (a) a disengaged state by a rotation in a first direction of the fixture (1) around a central axis (20), by a first pressurized shifting of the hydraulic actuating device (7), and, at the same time, bringing the detent unit (14) to an open state;
- and (b) is moved to an engaged state by a rotation in a second opposite direction of the fixture (1) around the central axis (20), by a second pressureless shifting of the hydraulic actuating device (7).
Dependencies are inferred from the claim text.