| 摘要 |
A multi-speed drive hub for bicycles, with or without a back-pedal brake, can have a hub shift transmission which has a first, and second, and a differential planetary gear set. A differential ring gear which belongs to the differential planetary gear set, can be connected to a hub sleeve by means of a clutch device which acts in one direction of rotation. Depending on the speed of rotation of the first and second ring gear of the first and second planetary gear set, the differential sun wheel and the second planetary carrier of the differential planetary gear set are rotated at different speeds of rotation, whereby either the differential sun wheel or the second planetary carrier of the differential planetary gear set runs faster, as a result of which the multiplicity of speeds which results from the alternating stopping of the sun wheels of the first and second planetary gear set on the hub axle on the first and second ring gear is transmitted from the first and second planetary gear sets into the differential planetary gear set. The advantage of such hub shift transmissions is that it is possible to realize a multi-speed hub with gear spreads which can be arbitrarily modified by design and construction measures.
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