MULTIPLE-SPEED CYCLE GEAR HUB AND CYCLE INCORPORATING THE SAME

摘要

A multiple-speed cycle gear hub comprising a gear casing (4) and a drive input member (16) one end of which projects from the casing. That end is adapted to receive a multiple sprocket Derailleur gear block (19) preferably incorporating its own freewheel mechanism. A clutch member (25) is rotatable by and axially slidable on the drive input member (16) between positions where it drives directly a carrier (39) secured to the casing and where it drives the carrier through a planetary gear arrangement (34, 35, 36, 41). The hub itself is preferably devoid of any freewheel ratchet mechanism and the internal gears within the hub are in constant mesh and do not substantially alter their relative radial or axial distances from one another at any time during operation of the hub.