A gearbox (2, figure 1) for a bicycle comprises an input gear (8, figure 2); an output gear (4, figure 2) not coaxial with the input gear; a plurality of drive transfer units 26 connecting the input gear 8 and output gear 4, each comprising a first gear 44 engaged with the input gear 8, a second gear 46 engaged with the output gear 4 and a shaft 58 therebetween, each drive transfer arrangement 26 configurable between a locked configuration where rotation of the first 44 gear causes rotation of the second 46 gear such that drive between the input gear 8 and output gear 4 is enabled and an unlocked configuration whereby the first 44 and second 46 gears rotate independently of one another; one of the plurality of drive transfer arrangements 26 being selectable at a time. Each drive transfer unit has a different ratio and is placed at a different point on the circumferences of the input and output gears 8, 4.
Gearbox
2024-03-06
Patent
Electronic Resource
English