Development of a power transmission device for bicycles and verification of its effectiveness using musculoskeletal model

Bicycles have been recognized for their advantages such as low environmental impact, health improvement, and maintenance of transportation function in times disaster, demand bicycles is increasing social conditions change. The pedaling a conventional bicycle nowadays turns crank to rotate the front gear, which transmitted rear gear by chain, axle wheel. Since require human power pedal, structure that allows be pedaled with load has considered so more people can easily use bicycles. This study developed new transmission system enables without using gearbox or external motor. In order verify effectiveness newly device, prototype proposed device was fabricated tested. Participants quantitatively evaluated physical bicycle. experimental results showed reduce load.