| 摘要 |
<p>Object: To allow the shift operation to be performed in both directions with a light operating force even when a drive force is applied during riding. Means for Solution: The bicycle internal shifter hub 10 is such that power is transmitted from a driver 21 ÄsicÜ to a ring gear 43 via a second one-way clutch 51 during a shift to the upshift side, and the shift operation is performed without going through the clutch member 45. During a shift to the downshift side, the shift key 49 swingably provided to a hub axle 21 strikes the cam surface 47 of the clutch member 45, the rotational drive force transmitted to the clutch member 45 is converted into an assist force in the axial direction of the clutch member 45, and this rotational drive force is utilized to operate the clutch member 45 even when there is a large amount of separation resistance for the first one-way clutch 50 or the clutch member 45. <IMAGE></p> |
