Design of an 8-speed Internal Gear Hub with a Rotary Control Mechanism for Bicycles
نویسندگان
چکیده
Original scientific paper This paper proposes a novel design of an 8-speed internal gear hub which consists of a distributed-flow-type planetary gear mechanism and a rotary gearshifting control mechanism. The distributed-flow-type planetary gear mechanism comprises two transmission units and one differential unit to provide eight forward gears. A clutching sequence table and a set of feasible solutions for the number of gear-teeth of the planetary gear mechanism are synthesized. The power transmission path at each gear stage is checked to verify the validity of the planetary gear mechanism. The main components of a rotary gear-shifting control mechanism to cooperate with the gear mechanism and mechanically control the engagement or disengagement of each locking clutch are illustrated. Based on the clutching sequence table, the design of a rotary gear-shifting control mechanism is presented, and the unique features of the proposed design are addressed. Finally, a compact 8-speed internal gear hub for bicycles is presented.
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