Machine element or mechanism – Gearing – Plural power paths to and/or from gearing
Patent
1976-11-01
1978-07-04
Scott, Samuel
Machine element or mechanism
Gearing
Plural power paths to and/or from gearing
F16H 344
Patent
active
040981479
ABSTRACT:
An improved Waddington drive, employed here as a bicycle wheel hub, provides an automatically shifting transmission 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 cylindrical 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.
REFERENCES:
patent: 3803931 (1974-04-01), Bianchini et al.
patent: 3848474 (1974-11-01), Epstein
patent: 3874253 (1975-04-01), Waddington
Avco Corporation
Gelling Ralph D.
McKenzie, Jr. Frank H.
Scott Samuel
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