| 摘要 |
A portable removable apparatus for powering a bicycle driven by a bicycle chain is disclosed. The apparatus includes a portable and removable drive unit for propelling the bicycle. The drive unit includes an electric motor and an output shaft rotatable by the electric motor, with a sprocket coaxially affixed to the shaft and adapted to engage to a portion of the bicycle 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 output shaft for supporting the output 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; with the bracket adapted to hold and apply tension to the output shaft and the axle so as to hold the belt taut against the drive pulley and the perimeter of a tire of the bicycle. |
