| 摘要 |
In order to minimize unwanted corotation, a gear support member is in the shape of a flat disk and has an outer diameter greater than the pitch circle of a ring gear. Further, a surface level of lubricating oil stored in a casing is set to be below the ring gear, but above the gear support member. Furthermore, a resilient clip is resiliently fitted on an output shaft and gear support member, and the resilient clip has at least one end supported by the casing. In addition, the casing has, on its bottom, a frictional surface for sliding contact with the lower surface of the gear support member.
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