| 摘要 |
A portable removable apparatus for powering a bicycle driven by a chain is disclosed. The apparatus includes a portable and removable drive unit for propelling the bicycle. The drive unit includes an electric motor and a shaft rotatable by the motor, with a sprocket coaxially affixed to the shaft and adapted to engage to a portion of the chain. The apparatus also includes a bracket adapted to be fixed to a frame of the bicycle and to be in bearing contact with the shaft for supporting the shaft. The apparatus further includes at least one additional support for supporting the drive unit on the bicycle frame so that lateral torque on the drive unit when engaged with the chain and operating is substantially eliminated. Another embodiment is disclosed in which the drive unit includes a flexible belt looped around a drive pulley connected to the motor and an idler pulley. |
