Variable transmission pulley

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

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Details

474 11, 474 49, F16H 5552

Patent

active

052540430

ABSTRACT:
A transmission system for vehicles. The transmission system has a pulley mounting a shaft extending from a mandrel of a power source, an automatic clutch for driving a wheel and a belt linking the pulley with the clutch. The pulley has a first section securely mounting the shaft, a second section axially moving along the shaft and a disk securely mounting the shaft. The first and second sections each have a belt-engaging side shaped as a truncated cone. The second section further has a slide-engaging side formed with a number of radial slopes. A corresponding number of slides contact the slopes and the disk. When a rotational speed of the shaft increases, centrifugal forces exerted on the slides overcome a tension in the belt, so that the slides radially spread between the slide-engaging sides of the second section and disk for axially moving the second section toward the first section, so that the belt-engaging sides of the first and second sections expand the belt for raising a radius of curvature of the belt riding thereon. When the rotational speed of the shaft decreases, the tension in the belt overcomes the centrifugal forces exerted on the slides, so that the belt contracts for reducing the radius of curvature of the belt.

REFERENCES:
patent: 3863514 (1975-02-01), Jensen
patent: 4705492 (1987-11-01), Hattori et al.

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