Parking lock for a motor vehicle
A motor vehicle parking lock includes a locking pawl, an actuator shaft, a pawl actuating element and a crank mechanism. The locking pawl is pivotable about a first rotational axis and includes a pawl tooth configured for engagement in a recess of a locking tooth system in a positively locking manner. The actuator shaft is rotatable about a second rotational axis to actuate the locking pawl and reversibly bring the pawl tooth into engagement with the recess. The pawl actuating element is linearly moveable along a translation axis to pivot the locking pawl. The crank mechanism converts rotary motion of the actuator shaft into linear motion of the pawl actuating element. The crank mechanism includes a connecting rod with an articulation point at the pawl actuating element, and a joint that connects the connecting rod and a crank. The joint is arranged between the pawl tooth and the articulation point.
1. A parking lock for a motor vehicle comprising:
a first rotational axis;
a locking pawl pivotable about the first rotational axis and comprising:
a pawl tooth configured for engagement in a recess of a locking tooth system in a positively locking manner;
a second rotational axis;
an actuator shaft rotatable about the second rotational axis to actuate the locking pawl and reversibly bring the pawl tooth into engagement with the recess;
a pawl actuating element, linearly moveable along a translation axis to pivot the locking pawl; and, a crank mechanism arranged to convert rotary motion of the actuator shaft into linear motion of the pawl actuating element and comprising:
a crank;
a connecting rod comprising an articulation point at the pawl actuating element; and,
a joint:
connecting the crank and the connecting rod; and,
arranged between the pawl tooth and the articulation point when viewed in a direction of the translation axis.
2. The parking lock of claim 1 wherein:
the joint comprises a pivoting axis; and,
the pivoting axis and the first rotational axis are at a right angle when the pivoting axis is projected onto the first rotational axis.
3. The parking lock of claim 2 wherein the second rotational axis and the pivoting axis are arranged parallel to one another.
4. The parking lock of claim 2 further comprising:
a first distance between the articulation point and the joint; and,
a second distance between the second rotational axis and the pivoting axis, wherein the first distance is at least twice the second distance.
5. The parking lock of claim 2 wherein a maximum distance between the pivoting axis and the translation axis is less than twice a width of the locking pawl.
6. The parking lock of claim 1 wherein the first rotational axis, the second rotational axis, and the translation axis are each arranged orthogonal with respect to one another.
7. The parking lock of claim 1 further comprising a transmission element, wherein:
the transmission element comprises:
the pawl actuating element;
a cage rigidly connected to the pawl actuating element; and,
a plurality of rollers mounted in the cage.
8. The parking lock of claim 7 wherein the transmission element further comprises:
a rod connecting the cage and the pawl actuating element; and,
a helical compression spring surrounding the rod to preload the rod.
9. The parking lock of claim 8 wherein a length of the locking pawl is greater than a length of the transmission element in a direction of the translation axis.
10. The parking lock of claim 1 further comprising an electric motor to drive the actuator shaft.
11. The parking lock of claim 1 wherein the crank and the connecting rod are only connected by the joint.