AUTOMATICALLY SHIFTING, THREE-SPEED BICYCLE HUB

摘要

In a three-speed bicycle hub, overrunning pawl-and-ratchet clutches respectively connect the hub shell to the driver and to the ring gears of two sets of planetary gearing whose planet gears are mounted on a common planet carrier fixed to or integral with the driver. The clutches between the ring gears and the hub shell are controlled by centrifugal governors.