Patent ID: 7735619

Claim:
A shift-by-wire type parking mechanism for switching an output shaft of an automatic transmission between a lock state where the output shaft is incapable of rotating and an unlock state where the output shaft is capable of rotating, the parking mechanism comprising: a parking gear that is fixed externally to the output shaft of the automatic transmission; a parking lock pawl that has a pawl latched to the parking gear and is displaced so as to latch the pawl to the parking gear to bring the parking gear into a lock state where the output shaft is incapable of rotating or to separate the pawl from the parking gear to bring the parking gear into the unlock state where the output shaft is capable of rotating; a parking rod that is pushed and pulled so as to bring the parking lock pawl close to or away from the parking gear; a detent lever that is tiltably supported so as to push and pull the parking rod and is provided with a first engagement recess portion for unlocking, a second engagement recess portion for locking, and a third engagement recess portion for standby that is shallower than the first and second engagement recess portions; an actuator that tilts the detent lever by a predetermined angle in an appropriate direction; a latch lever that brings about a state where the detent lever is kept in a tilted posture for performing a parking lock operation, by engaging with the second engagement recess portion, a state where the detent lever is kept in a tilted posture for releasing a parking lock, by engaging with the first engagement recess portion, and a state where the detent lever is kept in a standby posture immediately preceding the lock state, by engaging with the third engagement recess portion; an operating member that outputs a parking request signal for setting the lock state in response to a manual operation; and a controller that drives the actuator in response to the parking request signal output from the operating member to perform processing for bringing about the state where the detent lever is kept in the tilted posture for performing the parking lock operation, and drives the actuator to perform standby processing for bringing about the state where the detent lever is kept in the standby posture immediately preceding the lock state to wait for the parking request signal to be sent from the operating member when it is predicted that the parking lock operation is requested.