| 摘要 |
The present invention is structured by using one or both of an active wheel and a passive wheel to be constituted by a bimodal elliptical wheel, so that in the reciprocal treadle performed by the human's feet, when the feet input forces at different angles to an active wheel shaft combined on the active wheel through cranks and treadle shafts of the treadles, the active wheel forms different transmission speed ratios relative to the passive wheel according to the treadle angle.
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