Patent ID: 6845857

Claim:
A parallel shaft reduction gear used in combination with a motor, comprising: an output shaft; at least one primary-stage shaft disposed in a gear case, the primary-stage shaft being parallel to the output shaft; a backstop mechanism for preventing reverse rotation of the output shaft; an opposite motor side bearing for rotatably supporting an opposite motor side of the output shaft, the opposite motor side being an opposite side of a side on which the motor is attached to the gear case; and an opposite motor side bearing for rotatably supporting an opposite motor side of the primary-stage shaft; wherein the backstop mechanism is installed in any one of the output shaft and the primary-stage shaft at a position further from the motor than the corresponding opposite motor side bearing of the shaft on which the backstop mechanism is installed and, wherein the corresponding opposite motor side bearing of the shaft equipped with the backstop mechanism is assembled at a first position along a first axis defined as being parallel to a longitudinal axis of the output shaft, wherein an opposite motor side bearing of the other one of the shafts which is parallel to the shaft equipped with the backstop mechanism is located at a second position along the first axis, and wherein the first position is closer to the motor than the second position.