| 摘要 |
An electrical twist vehicle includes a transmission system which enables a rider to selectively switch between electrically operated mode and manually operated mode for two rear wheels of the electrical twist vehicle by shifting a control member into a predefined position. In electrically operated mode, the two rear wheels of the electrical twist vehicle are driven by an electrical driving device whereas in manually operated mode, the two rear wheels of the electrical twist vehicle are set to free rotating. The transmission system includes a driving wheel connected to an electrical driving device, a driven wheel connected to a rear wheels axle, a transmission belt connecting the driving and driven wheel, and a biasing wheel wherein in electrically operated mode. The biasing wheel is adapted to bias against the transmission belt for increasing its tension, so that the driving wheel is capable to drive the two rear wheels, and wherein in manually operated mode, the biasing wheel is adapted to move away from the transmission belt for reducing its tension, so that the two rear wheels are capable to rotate freely.
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