| 摘要 |
A single speed planetary transmission located inside the wheel hub of a pedal-propelled vehicle such as a bicycle. The transmission is chainless and includes a pair of fixed ring gears, planetary gear carriers mounted for rotation with the drive shaft, planetary gears carried by the gear carriers and meshed with the fixed ring gears, and a sun gear meshed with the planetary gears and coupled to the hub by a conventional free-wheel ratchet mechanism. The transmission provides an optimum gear ratio in a compact, chainless, low maintenance assembly.
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