| 摘要 |
<p>The invention provides a motor-assisted bicycle allowing a rider to easily stride across a body frame when getting on and off the bicycle, thereby improving the usability of the bicycle. <??>A motor-assisted bicycle, on which a motor-driven assist unit (1) including a crank shaft (101) and a motor for generating assist-power to be imparted to the crank shaft (101) is mounted, has a downwardly projecting U-shaped body frame (2) connected to a head pipe (21). The motor is positioned rearwardly from the crank shaft (101); and the bottom of the U-shaped body frame (2) is positioned forwardly from the unit (1) and is also positioned under the crank shaft (101). Since the bottom, that is, the lowermost portion of the U-shaped body frame (2) can be lowered, the position of the obstacle to the rider's motion to get on and off the bicycle becomes lower, with a result that it is easy for the rider to stride across the U-shaped body frame, thereby improving the usability of the bicycle when the rider gets on and off the bicycle. <IMAGE></p> |
