Patent ID: 8684122

Claim:
A power-assisted bicycle comprising: a front wheel and a rear wheel, one of the front and rear wheels being a drive wheel and having a hub ( 1 ); a frame connecting the front and rear wheels; a secondary battery and a motor that are mounted on the frame; a crankshaft to which a manual force is to be applied; a sprocket ( 7 ) arranged such that driving force due to manual force applied to the crankshaft and/or an output of the motor can be transmitted to the drive wheel through the sprocket ( 7 ); and a transmission ( 5 ) and a one-way clutch ( 2 ) for reverse input mounted in the hub ( 1 ); wherein the transmission ( 5 ) is operably coupled to the sprocket ( 7 ) and the drive wheel so as to be capable of transmitting the driving force from the sprocket ( 7 ) to the drive wheel; wherein the one-way clutch ( 2 ) for reverse input is configured to idle while the drive wheel is being driven by manual force applied to the crankshaft and/or the output of the motor and to transmit reverse input from the drive wheel to the sprocket ( 7 ) while the drive wheel is not being driven via the motor and is not being driven via the crankshaft but the drive wheel is being rotated by forward travel of the bicycle so that reverse input from the drive wheel can be transmitted to an output shaft of the motor; and wherein a regenerative mechanism is arranged to convert the reverse input applied to the output shaft of the motor to electric power and store the electric power in the secondary battery.