| 摘要 |
PROBLEM TO BE SOLVED: To reduce manufacturing cost by reducing the number of parts, to improve dust proofing function by reducing gaps between the parts, and to provide a compact structure without enlarging a crank part, thereby achieving an easy-to-ride power-assisted bicycle so as not to increase the distance between pedals.SOLUTION: A crank structure of a power-assisted bicycle with a torque sensor includes: a connection part 19 for connecting a connection board 31 to a crank body 11; and a phase forming part 20 for causing the connection board 31 to have a phase difference, which are integrated with each other. A disk part 13 of the crank body 11 is formed in a concave plate shape which is dented from a periphery 17 thereof to the center. The connection part 19 and the phase forming part 20 protrude therefrom. |
