| 摘要 |
A drive assembly having a drive shaft rotatably carried in a support for rotation about an axis thereof. An output sprocket is carried on a first carrier of the drive assembly to be driven from the drive shaft by means of a gear assembly including a plurality of sun gears and planetary gears. The second of the planetary gears is rotatably mounted to the carrier. The first sun gear is locked against rotation relative to the drive shaft. The locking structure includes a carrier for carrying one set of the planetary gears and having locking structure cooperating with complementary locking structure on the second sun gear.
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