Range change device

A range change device comprising:

• a main motor and an auxiliary motor;
• a sun gear which is joined to a motor shaft of the main motor;
• an auxiliary gear which is joined to a motor shaft of the auxiliary motor;
• a plurality of planetary gears which are engaged with the sun gear and are arranged on a circumference of the sun gear at equal intervals;
• an annular gear in which internal teeth engaged with the planetary gears and external teeth engaged with the auxiliary gear are formed;
• a carrier which supports the planetary gears in a state where the carrier allows the planetary gears to rotate and revolve and is held in a state where the carrier is rotationally slid on an external circumference of the motor shaft of the main motor;
• a small gear which is mounted on the carrier on a surface opposite to a surface on which the planetary gears are mounted and rotates about an axis of the motor shaft of the main motor;
• and
• a large gear which is engaged with the small gear,
• wherein a shift range of an automatic transmission is changed by rotation of the large gear.