| 摘要 |
PROBLEM TO BE SOLVED: To directly transmit the rotational drive force of an electric motor to a wheel side with a simple constitution without any speed reduction mechanism. SOLUTION: In a power-assisted traveling electric bicycle in which a battery and an electric motor 42 are mounted on the bicycle and the auxiliary power of the electric motor 42 is added to the human power, a strip-like transmission belt 56 is stretched between a motor pulley 46 pivotably supported by an output shaft 44 of the electric motor 42 and a driven pulley 54 integrated with a rim 52 of a rear wheel 32, the magnitude of the auxiliary power of the electric motor 42 is controlled by a control device based on the result of detection by a torque sensor to detect the stepping force, and the auxiliary power is directly transmitted to the rear wheel 32 by the transmission belt 56. The rotation of the electric motor 42 is directly transmitted to the rear wheel 32 by the strip-like transmission belt 56 and the driven pulley 54 integrated with the rim without interposing any speed reduction mechanism midway thereof, and the power-assisted traveling which is small in power loss and excellent in efficiency can be realized with a simple constitution. |
