To prevent the wear or seizure and to precisely perform the positioning by providing a battery, an electric motor for rotating a rotating shaft, a transmission device provided between the rotating shaft or pedal shaft and a transmission member, and a one-way clutch for transmitting the rotating force from the rotating shaft or pedal shaft to only the transmission member.
A one-way clutch built-in type ball bearing 26 is provided between a carrier 14 constituting a step-up gear 8 between a pedal shaft 2 and a sprocket 5 and the pedal shaft 2. The one-way clutch built-in type ball bearing 26 has an inner ring 27 and outer ring 28 cylindrically formed and concentrically arranged. The inner ring 2 7 is spline engaged with the middle part circumferential surface of the pedal shaft 2, and the outer ring 28 is fitted and fixed into a cylindrical part 29 formed in the center of the carrier 14, According to this, a small-sized structure having excellent durability and a satisfactory using feeling can be provided.
| WO/2020/144410 | MECHANICAL REDUCTION GEAR |
| JPH1179062 | BICYCLE WITH ELECTRIC AUXILIARY POWER DEVICE |
| JP3808187 | ELECTRICALLY-DRIVEN AUXILIARY BICYCLE |
OZAWA ATSUSHI
YATABE HIROYUKI
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