Range switching apparatus of shift-by-wire system

A range switching apparatus of a shift-by-wire system, comprising:

• a main motor;
• a deceleration mechanism that amplifies torque generated by the main motor;
• an output shaft that outputs the torque amplified by the deceleration mechanism;
• an auxiliary motor that includes an auxiliary motor shaft;
• and
• an emergency drive mechanism disposed on the auxiliary motor shaft, that is connected to or disconnected from the deceleration mechanism by driving of the auxiliary motor, and that transfers the output of the auxiliary motor to the deceleration mechanism and rotates the output shaft by being connected to the deceleration mechanism,
• wherein the emergency drive mechanism includes:
• a feed screw disposed on the auxiliary motor shaft;
• and
• an auxiliary gear body that surrounds the feed screw and moves along the auxiliary motor shaft by the rotation of the auxiliary motor shaft, and
• wherein a gear portion that engages with a gear of the deceleration mechanism is disposed in the auxiliary gear body.