| 摘要 |
A method of altering a drive ratio on a driven wheel includes providing a drive wheel, a driven wheel, and a planetary gear assembly having a sun gear, planetary gears, and a ring gear. Alternative inputs are provided to couple the drive wheel to the driven wheel in a first configuration and in a second configuration. At least one of the first configuration and the second configuration couples the drive wheel to the sun gear, planetary gears, and the ring gear as an input, and couples the driven wheel to another of the sun gear, planetary gears, and ring gear as an output.
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