ELECTRICALLY ASSISTED BICYCLE

摘要

Provided is an electrically assisted bicycle that can detect torque using a magnetostrictive torque sensor, and that can maintain satisfactory torque detection capability while detecting rotation of a crankshaft or the like. Placed on the outer periphery of a crankshaft (7a) are a tubular input transmission body (28) on which a torque sensor (31) for detecting input drive force is formed, an intermediate tube body (23) to which input drive force from the input transmission body (28) is transmitted, and a coupling body (29) to which input drive force from the intermediate tube body (23) is transmitted. Between the intermediate tube body (23) and the coupling body (29), a one-way clutch (30) is placed and there is provided a rotation detector (10) for detecting rotation of a rotating body (11) attached to the intermediate tube body (23), an optical sensor being used as the rotation detector (10).