A shift device includes: a shift switching member including a plurality of valley portions corresponding to shift positions; a motor that includes a rotor and a stator and that is configured to drive the shift switching member; and a positioning member configured to establish the shift positions in a state in which the positioning member is fitted into any one of the plurality of valley portions of the shift switching member. The shift device is configured to learn the shift positions based on a change amount of a load torque applied to the motor while the positioning member is moved to continuously pass through the plurality of valley portions.

A shift device includes: a shift switching member including a plurality of valley portions corresponding to shift positions; a motor that includes a rotor and a stator and that is configured to drive the shift switching member; and a positioning member configured to establish the shift positions in a state in which the positioning member is fitted into any one of the plurality of valley portions of the shift switching member. The shift device is configured to learn the shift positions based on a change amount of a load torque applied to the motor while the positioning member is moved to continuously pass through the plurality of valley portions.

A transmission for a vehicle includes a transmission shift unit that receives a shift command of the vehicle, a driving unit that generates a driving force for causing the transmission shift unit to be switched between positions, and a controller configured to control the driving unit for causing the transmission shift unit to be switched between the positions depending on whether a preset condition is satisfied. In particular, the driving unit includes a first stator to generate magnetic flux, a first rotor including first inner permanent magnets and second inner permanent magnets and configured to be rotated by the magnetic flux transmitted to the first inner permanent magnets, outer permanent magnets, a second rotor disposed between the second inner permanent magnets and the outer permanent magnets, and a clutch unit disposed between the first rotor and the second rotor.

A transmission for a vehicle includes a transmission shift unit that receives a shift command of the vehicle, a driving unit that generates a driving force for causing the transmission shift unit to be switched between positions, and a controller configured to control the driving unit for causing the transmission shift unit to be switched between the positions depending on whether a preset condition is satisfied. In particular, the driving unit includes a first stator to generate magnetic flux, a first rotor including first inner permanent magnets and second inner permanent magnets and configured to be rotated by the magnetic flux transmitted to the first inner permanent magnets, outer permanent magnets, a second rotor disposed between the second inner permanent magnets and the outer permanent magnets, and a clutch unit disposed between the first rotor and the second rotor.

A rotary actuator for a shift-by-wire system of a vehicle includes a motor with a motor shaft, an output shaft disposed in parallel with the motor shaft, a speed-reducing mechanism configured to reduce a rotational speed of the motor and transmit the rotation of the motor to the output shaft, and a case housing the motor and the speed-reducing mechanism. The speed-reducing mechanism includes a first speed-reducing portion including a ring gear and a sun gear, and a second speed reducing portion including a drive gear and a driven gear. The drive gear and the driven gear are coaxially disposed with the motor shaft and the output shaft, respectively, to serve as parallel shafts type gears. The drive gear is disposed between the motor and the first speed-reducing portion in an axial direction of the motor.

A rotary actuator for a shift-by-wire system of a vehicle includes a motor with a motor shaft, an output shaft disposed in parallel with the motor shaft, a speed-reducing mechanism configured to reduce a rotational speed of the motor and transmit the rotation of the motor to the output shaft, and a case housing the motor and the speed-reducing mechanism. The speed-reducing mechanism includes a first speed-reducing portion including a ring gear and a sun gear, and a second speed reducing portion including a drive gear and a driven gear. The drive gear and the driven gear are coaxially disposed with the motor shaft and the output shaft, respectively, to serve as parallel shafts type gears. The drive gear is disposed between the motor and the first speed-reducing portion in an axial direction of the motor.

A drive device includes: an actuator rotating, around a rotation axis, a shift drum having a lead groove formed on an outer peripheral surface; and an angle correction unit correcting a detection value of a rotation angle sensor that detects a rotation angle of the shift drum. The angle correction unit calculates the rotation angle of the shift drum at a reference position as a learning angle based on a correspondence between a displacement amount of a first engaging portion and a change amount of the rotation angle of the shift drum per a predetermined time of rotation of the shift drum at a predetermined speed. Then, the angle correction unit corrects the detection value of the rotation angle sensor based on an amount of deviation between the learning angle and a design angle.

A drive device includes: an actuator rotating, around a rotation axis, a shift drum having a lead groove formed on an outer peripheral surface; and an angle correction unit correcting a detection value of a rotation angle sensor that detects a rotation angle of the shift drum. The angle correction unit calculates the rotation angle of the shift drum at a reference position as a learning angle based on a correspondence between a displacement amount of a first engaging portion and a change amount of the rotation angle of the shift drum per a predetermined time of rotation of the shift drum at a predetermined speed. Then, the angle correction unit corrects the detection value of the rotation angle sensor based on an amount of deviation between the learning angle and a design angle.

A shift device mounted on a vehicle includes a motor configured to drive, by electric power supplied from a power supply mounted on the vehicle, a shift switching member configured to switch shift positions, a cut-off unit configured to cut off conduction of a power supply line through which the electric power is supplied to the motor, and a drive circuit unit configured to output the electric power to the motor and including a driving switching element configured to execute a switching operation. The shift device is configured to determine an abnormality of the power supply line when a voltage of the power supply line is smaller than a predetermined threshold value, turn off the driving switching element, and cut off the conduction of the power supply line by the cut-off unit.

A shift device mounted on a vehicle includes a motor configured to drive, by electric power supplied from a power supply mounted on the vehicle, a shift switching member configured to switch shift positions, a cut-off unit configured to cut off conduction of a power supply line through which the electric power is supplied to the motor, and a drive circuit unit configured to output the electric power to the motor and including a driving switching element configured to execute a switching operation. The shift device is configured to determine an abnormality of the power supply line when a voltage of the power supply line is smaller than a predetermined threshold value, turn off the driving switching element, and cut off the conduction of the power supply line by the cut-off unit.