Provided is an electric assist bicycle such that sufficient auxiliary drive force can be applied while enabling good shifting, no problem of interference between a mount or a battery and a front derailleur is caused, and further a decrease in torque transmission efficiency is not caused. On the outer periphery of a crank shaft, there is disposed a tubular human power transmission member to which human powered drive force is transmitted. On the outer periphery of the crank shaft, there is disposed a combined force transmission member to which combined force combining the human powered drive force and auxiliary drive force from a motor is transmitted. A speed-reduction mechanism includes a plurality of pairs of speed-reduction gears and a selection clutch engageable with the speed-reduction gears. The speed-reduction mechanism combines the human powered drive force and the auxiliary drive force, and performs shifting on the combined force combining the human powered drive force and the auxiliary drive force.
Electric assist bicycle
2016-02-24
Patent
Electronic Resource
English
IPC: | B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer |
European Patent Office | 2018
|European Patent Office | 2018
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