A shift drive including an actuating mechanism, a rack, and a gear housing. The actuating mechanism is driven by a driving mechanism. The rack is linked with the actuating mechanism. The rack includes a connection portion connected to the actuating mechanism through a connecting member 301 The gear housing is provided with an induction gear that meshes with the rack. The gear housing includes a track slot includes a take-up release section and a straight rail section, and an end portion of the rack is capable of a recoverable deformation that can slide in or out of the take-up release section and the length of projection of the take-up release section on an extension line in the direction of the length of the straight rail section is less than the length of the track thereof.

A transmission including a one-axis shift mechanism is provided. The transmission including a one-axis shift mechanism includes a transmission including a shift mechanism in which a shift fork is slidably coupled to a shift rail, and the shift fork includes a sleeve that allows the shift fork to be meshed with a gear portion coupled to an input shaft, the transmission including a motor, a first shift gear which is connected to the motor and moves according to rotation of the motor, a second shift gear arranged at one end of the shift rail and secured to the first shift gear, and a sliding pin arranged at the other end of the shift rail and configured to slide the shift fork by contacting a sliding protrusion arranged around an insertion hole of the shift fork, into which the shift rail is inserted.

A transmission including a one-axis shift mechanism is provided. The transmission including a one-axis shift mechanism includes a transmission including a shift mechanism in which a shift fork is slidably coupled to a shift rail, and the shift fork includes a sleeve that allows the shift fork to be meshed with a gear portion coupled to an input shaft, the transmission including a motor, a first shift gear which is connected to the motor and moves according to rotation of the motor, a second shift gear arranged at one end of the shift rail and secured to the first shift gear, and a sliding pin arranged at the other end of the shift rail and configured to slide the shift fork by contacting a sliding protrusion arranged around an insertion hole of the shift fork, into which the shift rail is inserted.

An L-shaped bracket (151) is fixed to a top end portion of a rack shaft (141) of a selecting actuator (133) of a transmission actuator unit (131) through a rotatable joint (152). An actuator housing (161) of a shifting actuator (134) is supported on a mounting surface (151a) of the L-shaped bracket (151) so as to be attachable to and detachable from the mounting surface (151a) through a lock mechanism (154) (a lock pin (155) and a lock hole (162a)). The shifting actuator (134) can be mounted with the shifting actuator (134) being reversed 180 degrees.

An L-shaped bracket (151) is fixed to a top end portion of a rack shaft (141) of a selecting actuator (133) of a transmission actuator unit (131) through a rotatable joint (152). An actuator housing (161) of a shifting actuator (134) is supported on a mounting surface (151a) of the L-shaped bracket (151) so as to be attachable to and detachable from the mounting surface (151a) through a lock mechanism (154) (a lock pin (155) and a lock hole (162a)). The shifting actuator (134) can be mounted with the shifting actuator (134) being reversed 180 degrees.

A shift drive including an actuating mechanism, a rack, and a gear housing. The actuating mechanism is driven by a driving mechanism. The rack is linked with the actuating mechanism. The rack includes a connection portion connected to the actuating mechanism through a connecting member 301 The gear housing is provided with an induction gear that meshes with the rack. The gear housing includes a track slot includes a take-up release section and a straight rail section, and an end portion of the rack is capable of a recoverable deformation that can slide in or out of the take-up release section and the length of projection of the take-up release section on an extension line in the direction of the length of the straight rail section is less than the length of the track thereof.

A drive switching apparatus includes an output member connected to a drive switching member and displacing the drive switching member to three shift positions by being rotated, a deceleration mechanism decelerating rotation of an input portion connected to an electric motor and outputting the rotation to an output portion, a rotation absorption mechanism including an elastic member interposed between an input element connected to the output portion and an output element connected to the output member, the rotation absorption mechanism absorbing rotation of the input element in a case where rotation of the output element is restricted during the rotation of the input element, and a switch operation portion provided at the output element, the switch operation portion turning a switch on and off according to a rotational position of the output member in order to detect the shift positions of the drive switching member.

A drive switching apparatus includes an output member connected to a drive switching member and displacing the drive switching member to three shift positions by being rotated, a deceleration mechanism decelerating rotation of an input portion connected to an electric motor and outputting the rotation to an output portion, a rotation absorption mechanism including an elastic member interposed between an input element connected to the output portion and an output element connected to the output member, the rotation absorption mechanism absorbing rotation of the input element in a case where rotation of the output element is restricted during the rotation of the input element, aid a switch operation portion provided at the output element, the switch operation portion turning a switch on and off according to a rotational position of the output member in order to detect the shift positions of the drive switching member.