DEVICE OF COMPLEX DRIVING OF BICYCLE

摘要

PURPOSE: A complex driving device for a bicycle is provided to enable a user to ride a bicycle at high speed by increment in the rotation of a drive sprocket. CONSTITUTION: A complex driving device for a bicycle comprises a multi-stage drive sprocket(2), a rotation increasing unit(4), and an acceleration sprocket(3). The multi-stage drive sprocket is coupled with a rotary shaft(1x) of a crank(1). The rotation increasing unit comprises an inward gear(4a), combined with a drive sprocket(2a), multiple electrically-powered gears(4b), and an output gear(4c). The acceleration sprocket is combined with an output shaft(4x) integrated with the output gear. The rotation increasing unit comprises a support pipe(5x) inserted and fixed into the bearing part of the bicycle frame. The output gear of the rotation increasing unit is inserted into the support pipe.