| 摘要 |
An internal gear of a planetary gear reduction mechanism and a clutch outer member of a one-way clutch are formed integrally with a cylindrical rotary member extending axially. The rear end of the cylindrical rotary member is formed as the internal gear, while the front end thereof is formed as the clutch outer member. A boss portion or a centering portion is formed integral with the cylindrical rotary member between the internal gear and the clutch outer member. The inner peripheral surface of the boss portion slidably engages the peripheral surface of a planet carrier or a flange formed at the rear end of a drive shaft. In this manner, the axis of the cylindrical rotary member aligns coaxially with the drive shaft.
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