Parking lock unit and electric drive assembly having a parking lock

A parking lock unit for an electric drive assembly for driving a motor vehicle, comprising:

• a parking lock housing comprising a base portion with a bearing receptacle and, at a base end, connecting elements for connecting the parking lock housing to a housing of the electric drive assembly;
• a sleeve-shaped shaft journal which is rotatably supported in the first bearing receptacle about a rotational axis, wherein the shaft journal comprises a connecting profile for being connected to a driveshaft of the electric drive assembly in a rotationally fixed manner;
• a ratchet wheel which is connected to the shaft journal in a rotationally fixed way and which is received in a receiving space between the base portion and a cover portion of the parking lock housing;
• a locking element which is movably supported in the parking lock housing and which can be transferred into a locking position in which the locking element blocks a rotational movement of the ratchet wheel, and into a releasing position in which the locking element releases the ratchet wheel so that the ratchet wheel and the driveshaft connected thereto are freely rotatable;
• a controllable actuator connected to the parking lock housing and configured to selectively transfer the locking element into the locking position or into the releasing position;
• wherein a smallest inner diameter of the parking lock housing in the region of the ratchet wheel substantially corresponds to the largest outer diameter of the ratchet wheel.

An electric drive assembly for driving a motor vehicle, comprising:

• a housing assembly;
• an electric machine with a motor shaft provided in the form of a hollow shaft which is rotatably drivable around a rotational axis;
• a reduction gearing which is configured to slow down a torque introduced by the motor shaft, wherein the reduction gearing comprises a transmission shaft which is offset relative to the motor shaft;
• a differential gearing with a differential carrier and two output gears, wherein the differential gearing is configured to transmit a rotational movement introduced from the reduction gearing to the differential carrier to the two output gears;
• a parking lock unit with a ratchet wheel, a locking element and a controllable actuator, wherein the ratchet wheel is arranged coaxially relative to the rotational axis and is connected to the motor shaft in a rotational fixed way, wherein the locking element cooperates with the ratchet wheel and is controllable by the actuator in a closing sense in order to inhibit a rotational movement of the ratchet wheel, and is controllable in an opening sense in order to release the ratchet wheel,
• wherein the differential gearing and the parking lock unit are arranged on opposite sides of the electric machine.