| 摘要 |
Electric traction device for bicycle or any cycle, comprised of two electric motors (1) with permanent magnets mounted in opposition and driving a same central roller (2). Said two motors (1) enclosed into a thin wrapping metal sheet (3) forming the support to be fixed to the front fork of any bicycle enable, by mounting in series or in parallel their windings, the selection of two speeds from the constant voltage supplied by the battery, and the power recovery directly by reverse switching from second gear to first gear. The technical field of the invention is the electric motorization of a cycle, thereby providing a substantial aid to pedalling. It also relates to the suspension, since the said driving roller, associated to another driven roller by contact with the tyre, or driven by a flat belt forming a caterpillar, enables to suspend the front part or the rear part of the cycle in efficient and low cost conditions.
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