Continuous infinite-ratio power transmission device

Endless belt power transmission systems or components – Control for variable input to output speed-ratio

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F16H 5900, F16H 1516

Patent

active

052561100

ABSTRACT:
A power transmission device in which a drive wheel (1) and frictional ring (4) transmit rotational power from a driving arc-shaped cone (7) to a driven arc-shaped cone (5). The drive wheel (1) is rotatably attached to a holding frame (9), such that the drive wheel (1) is permitted substantially free rotation about an axle (3). One end of a holding frame (9) is rotatably attached with a control shaft (11) to a mounting structure (14). The other end of the holding frame (9) is rotatably attached with a control shaft (10) to a mounting structure (13). The drive wheel (1) and holding frame (9) can therefore pivot as a unit about an axis situated through control shaft (10) and control shaft (11). Driving arc-shaped cone (7) is fixedly attached to a driving shaft (8). The driving shaft (8) is rotatably attached to a mounting structure (15) and a second mounting structure (16). Driven arc-shaped cone (5) is fixedly attached to a driven shaft (6). The driven shaft (6) is rotatably attached to the mounting structures (15 and 16). In operation, a control lever (12) is actuated to pivot the drive wheel (1) and frictional ring (4) to a selected drive ratio. The active drive ratio is determined by the position of the drive wheel (1) as it contacts the driving arc-shaped cone (7) and driven arc-shaped cone (5). This device therefore provides an infinite selection of drive ratios within the range of drive ratios provided by the particular dimensions of such a device. The transition from one drive ratio to another drive ratio is smooth and continuous.

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Carl Zimmer, "Easy Rider", in Discover Magazine, Aug. 1990, p. 30.

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