POWER-ASSISTED BICYCLE

摘要

A power-assisted bicycle includes a front wheel, a rear wheel, a body frame, a bracket that mounts a power unit, and a power unit fixed to the bracket by a bolt. The power unit includes a pedal crank shaft and a motor that produces auxiliary power, and outputs each of human power applied to the pedal crank shaft and a driving force of the motor, or a resultant force of the human power and the driving force of the motor. The bracket includes a front mounting seat and rear mounting seat pointing downward. The power unit includes first and second front mounts and first and second rear mounts which overlap the front mounting seat and rear mounting seat from below. The bolt extends in a direction in which the front mounting seat and rear mounting seat and the mounts overlap each other, and fastens the mounts to the front mounting seat and the rear mounting seat.

主权项

1. A power-assisted bicycle comprising:
a front wheel; a rear wheel; a body frame that steerably and rotatably supports the front wheel and that rotatably supports the rear wheel; a bracket attached to the body frame; a power unit fixed to the bracket by a fixing bolt, the power unit including a crank shaft to be rotated by human power and a motor that produces auxiliary power, the power unit outputting each of the human power applied to the crank shaft and a driving force of the motor, or a combined force of the human power and the driving force of the motor; and a transmission that transmits the combined force of the human power and the driving force of the motor to the rear wheel; wherein the bracket includes a mounting seat pointing downward; the power unit includes a mount that overlaps the mounting seat from below; and the fixing bolt extends in a direction in which the mounting seat and the mount overlap each other, and fastens the mount to the mounting seat.