Lock mechanism of actuator

A lock mechanism of an actuator, which is provided in the actuator capable of changing a toe angle of a wheel by rotational drive of a motor and configured to lock operation of the actuator when the rotational drive of the motor is stopped, the lock mechanism comprising:

• a casing provided integrally with or separately from a housing of the actuator;
• an input-side shaft connected to a motor shaft of the motor and rotatably held in the casing;
• an output-side shaft to which rotational torque is transmitted from the input-side shaft;
• and
• a locking part that includes:
• at least one friction member;
• a pressing part and a side end part each provided on the input-side shaft;
• an abutting part provided on the friction member;
• and
• an urging member for urging the friction member, wherein
• when the rotational drive of the motor is stopped, an urging force of the urging member causes the friction member to abut on the casing to be brought into a friction lock state;
• when the motor is driven to rotate, the pressing part of the input-side shaft abuts on and presses the abutting part of the friction member to allow the friction member to be away from the casing so as to release the friction lock state;
• and
• after the friction lock state is released, the side end part abuts on the friction member and the rotational torque of the motor is transmitted from the input-side shaft to the output-side shaft to allow the toe angle of the wheel to be changed.