| 摘要 |
PROBLEM TO BE SOLVED: To prevent an outer from being inclined without extending the axial length. SOLUTION: With the internal gear 35 of a reduction gear, an irregularity part 35c is provided on the front end face of a ring-shaped part 35b, and the irregularity part 35c is engaged with an irregularity part 39c provided on a sliding plate. With the sliding plate, a sliding surface 39a is pressed and held against the wall face 10b of a center case 10 by a specified pressure through a washer 40. A one-way clutch for transmitting the rotational output of the reduction gear to an output shaft has an outer 36 to which a pin to which a planetary gear is journaled, is fixed. When the rotation center of the outer 36 coincides with the axis of the output shaft, a small clearance (for example, 1 mm or less) S is secured between the outer peripheral surface of a clutch cover 43 and the inner peripheral surface of the cylindrical part 39b of the sliding plate, the inner peripheral surface of the ring-shaped part 35b of the internal gear 35. |
