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Abstract
The multi-speed drive hub stored on the rear wheel of a bicycle is an important speed-changing device to adjust the pedaling force and driving speed. This paper proposes a feasible gear-shifting control mechanism of an 8-speed distributed-flow-type transmission mechanism. A transmission mechanism consisting of two parallel-connected transmission units and one differential unit is introduced first. Then, based on the clutching sequence table, the embodiment design of a gear-shifting control mechanism is presented to selectively control the engagement of pawl-and-ratchet clutches and slot-with-block clutches as well as govern the power-flow path. The power-flow path at each speed-stage of this 8-speed drive hub is analyzed to verify the feasibility of the proposed design.