Patent ID: 8839937

Claim:
A parking lock device for locking or unlocking a parking gear by a lock pawl, the device comprising: a rotation body that positively or negatively rotates according to positive or negative rotation of a motor; a driven lever that engages with the rotation body and pivots according to positive or negative rotation of the rotation body; a position determining plate including an outer peripheral surface, wherein the position determining plate pivots in a positive direction or a negative direction according to pivotal motion of the driven lever in a positive direction or a negative direction to selectively guide the lock pawl to a locked position at which the lock pawl engages with the parking gear and an unlocked position at which the lock pawl is disengaged from the parking gear; a first receiving portion and a second receiving portion formed in the outer peripheral surface of the position determining plate; a fitting member that is slidably pressed against the outer peripheral surface of the position determining plate to be received by the first receiving portion or the second receiving portion, thereby holding the lock pawl in the locked position or the unlocked position; an engaging member provided on the driven lever, wherein, when the rotation body rotates in the positive direction, the engaging member engages with the rotation body to positively rotate the driven lever, and when the rotation body rotates in the negative direction, the engaging member engages with the rotation body to negatively rotate the driven lever; an interrupting portion that interrupts a power supply to the motor when the fitting member reaches a first position or a second position of the position determining plate; an elastic member, wherein, when the power supply to the motor is interrupted, the elastic member presses the fitting member to pivot the position determining plate, thereby fitting the fitting member into the first receiving portion or the second receiving portion of the position determining plate; and a rotational energy absorption member for absorbing rotational energy of the rotation body when the power supply to the motor is interrupted.