Stepless drive having a cam actuated by an integral flyweight

Details Stepless drive having a cam actuated by an integral flyweight Stepless drive having a cam actuated by an integral flyweight

B - Operations, Transporting

62

M

74/31

B62M 9/06 (2006.01)

Patent

CA 1070519

WADDINGTON DRIVE HAVING A CAM ACTUATED BY AN INTEGRAL FLYWEIGHT Abstract of the Disclosure An improved Waddington drive, employed here as a bicycle wheel hub, provides an automatically shifting transmissio driven by an operator's foot pedal crank. A number of planet gears journaled for rotation in the hub engage and revolve around a fixed sungear on a mounting shaft thereby carrying and rotating the hub with them, The planet gears are connected through one-way clutches to cranks whose arms follow a cylindrica cam, the eccentricity of which is variable as a function of speed and torque. The cam is pivotally mounted from the rotating input shaft and its eccentricity is controlled by the reaction force between the cam and its followers, the centrifugal force on the cam, and a restoring force developed by a cantilever spring urging the cam to return to an initial eccentricity selectable to match the operator's capabilities. The centrifugal control force is developed by a flyweight integral with the cam and by a counterweight serving to dynamically balance the input shaft.

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