HUMAN POWER DRIVING FORCE DETECTION APPARATUS FOR ELECTRIC BICYCLE

摘要

Provided is a human power driving force detection apparatus for an electric bicycle which is capable of minimizing forward and backward power dispersion caused by a pedaling posture and detecting a force effectively which responds to a forward tensile force of a driving force transmission medium such as a chain. An elastic transformation portion (23a) is elastically transformed by a force applied thereto when a crank shaft (7a) is elastically transformed backwards by a reaction force to a forward tensile force of a chain (15) caused by a drive sprocket (13). A distortion detection sensor (24) is disposed at the elastic transformation portion (23a). The elastic transformation portion (23a) and the distortion detection sensor (24) are disposed toward a shaft center (7a') of the crank shaft (7a) from a backward position backwardly slanted from the shaft center (7a') of the crank shaft (7a) when viewed sideways.