A power transmission device includes a bearing, a differential mechanism, a case that houses the differential mechanism, a pinion gear supported by the case, a wall part that overlaps the case in an axial direction, a plate that is provided between the wall part and the case in the axial direction, and that supports the case with the bearing being interposed, and a parking pawl that is rotatably fixed to the plate in a position that overlaps the plate in the axial direction.

A method is provided for checking engagement and disengagement of a parking brake finger, which selectively blocks or blocks a shaft of the transmission. A motor-driven rotary selection plate is selectively controlled to butt against the transmission casing at the two ends of its travel, and is immobilized therebetween in a first functional engagement position and in a second functional disengagement position that correspond to the Park and non Park positions of the parking brake finger when the drive motor of the plate stops exerting torque thereon. The angular movements of the plate between its abutment positions are measured and incremented using a computer to determine whether the engagement position and disengagement position of the plate that is reached every time the drive motor is stopped corresponds to a command instruction given to the motor.

A rotary actuator is used in a shift-by-wire system for a vehicle. A speed reducer includes a ring gear and a sun gear and reduces a rotational speed of the motor. An output shaft outputs rotation of the motor at a reduced rotational speed by the speed reducer. A regulating pin is disposed in a fixing member and allows the sun gear to revolve around a rotational axis of the motor and to rotate about an eccentric axis. The regulating pin is a separate member from the fixing member. The regulating pin has a strength equal to or greater than a maximum torque reaction force received from the sun gear. A first difference in hardness between an engaging portion and the sun gear is set to be less than a second difference in hardness between the fixing member and the sun gear.

A cable actuated multi-pawl park lock includes an actuator, a first park lock device arranged for engaging a first gear wheel, a first cable connecting the actuator to the first park lock device, a second park lock device arranged for engaging a second gear wheel, and a second cable connecting the actuator to the second park lock device. In some example embodiments, the actuator includes an actuator housing, the first park lock device includes a first park lock housing, the first cable includes a first outer jacket having a first end fixed to the actuator housing and a second end fixed to the first park lock housing, the second park lock device includes a second park lock housing, and the second cable includes a second outer jacket having a first end fixed to the actuator housing and a second end fixed to the second park lock housing.

A structure of a rotation locking device that is easily configured and capable of keeping cost down is achieved.

A rotation locking device 4 switches between a first mode where an engaging claw portion 14 engages with an engaging concave portion 9 by an output member 13 rotating an engaging member 8 due to an input member 12 being rotationally driven by an actuator 7, and rotation of a locking gear 5 supported by and fixed to an output shaft 3 of an automatic transmission 2 is restricted, and a second mode where engagement between the engaging claw portion 14 and the engaging concave portion 9 is released and rotation of the locking gear 5 is allowed.

Provided are a vehicle parking device and a vehicle transmission. The vehicle parking device includes an actuator configured to rotate a worm gear mounted at an end thereof, a loading unit including a rack gear engaged with the worm gear and linearly moving according to a movement of the rack gear, a parking sprag in contact with the loading unit and rotating by a linear movement of the loading unit, and a parking gear provided in a drive shaft that transmits a driving force and selectively engaged according to a rotation of the parking sprag.

A motor control device controls a driving of a motor having a motor winding. The motor control device includes a motor control unit and a parameter setting unit. The motor control unit controls the driving of the motor. The parameter setting unit sets a control parameter related to a driving control of the motor such that at least one of a motor torque and a motor speed is variable according to a system temperature.

A rotary actuator for use in a shift-by-wire system of a vehicle includes a motor, a controller for controlling the motor, and a case housing the motor and the controller. An upper case of the case includes a resin molded body, which integrally has a housing that houses the motor and a connector that is used for external connection, and a plurality of external connection terminals, which are embedded in the resin molded body and are capable of connecting the controller to an outside member. Each of the external connection terminals includes a base protruding into an installation space for a control board in a board extending direction, a bend bent from the base toward the control board, and a tip portion extending from the bend to the control board.

An electronic parking mechanism that includes a parking cam assembly, a pawl assembly and a parking gear. The parking cam assembly includes a parking guide shaft and a parking cam that is sleeved on the parking guide shaft, and one side of the parking cam is provided with an arc protrusion along a circumferential direction so that as the parking cam rotates, the pawl assembly is in a first position where the pawl assembly parks in the parking gear and a second position where the pawl assembly parks out the parking gear, respectively. The pawl assembly includes a pawl and a pawl shaft, an upper part of the pawl contacts the parking cam, the pawl shaft is provided on a side of the pawl that can rotate around the pawl shaft.

An electronic parking mechanism that includes a parking cam assembly, a pawl assembly and a parking gear. The parking cam assembly includes a parking guide shaft and a parking cam that is sleeved on the parking guide shaft, and one side of the parking cam is provided with an arc protrusion along a circumferential direction so that as the parking cam rotates, the pawl assembly is in a first position where the pawl assembly parks in the parking gear and a second position where the pawl assembly parks out the parking gear, respectively. The pawl assembly includes a pawl and a pawl shaft, an upper part of the pawl contacts the parking cam, the pawl shaft is provided on a side of the pawl that can rotate around the pawl shaft.