| 摘要 |
A three-speed bicycle hub has planetary gearing axially centered on the hub shaft. A driving sleeve coupled to the driver and drive sprocket is arranged on the shaft on one side of the sun gear and a driven shaft coupled to the hub shell on the other side. The planet carrier projects axially in both directions beyond the planet gears and the sun gear, and the ring gear similarly projects beyond the planet carrier. A pair of overrunning clutches on each side of the sun gear connects the two sleeves to the ring gear and to the planet carrier. One clutch of each pair can be disengaged by a centrifugal governor whose flyweight is mounted on a respective sleeve in a hub cavity portion remote from the gearing.
|
