Driven pulley with flyweights effective at low speeds

Details Driven pulley with flyweights effective at low speeds Driven pulley with flyweights effective at low speeds

1993-06-28

1994-10-25

Buiz, Michael Powell

Endless belt power transmission systems or components

Pulley with belt-receiving groove formed by drive faces on...

Speed responsive

474 14, F16H 5900

Patent

active

053584503

ABSTRACT:
In a driven pulley used in a variable speed transmission adapted to receive a trapezoidal belt by which power is transmitted from a driving pulley to the driven pulley having a fixed flange, a movable flange and an internal helicoidal spring, there is provided a set of flyweights forced by torsion springs on an annular-conical surface located at the rear of the movable flange. At the minimum rotation speed, the driven pulley generates a high gripping force but as the rotation speed increases, the centrifugal force acting on the flyweights lowers the force exerted by the trapezoidal belt. At a given high rotation speed, the flyweights leave the annular-conical surface and no longer contribute to counterbalancing the radial force exerted by the trapezoidal belt, the helicoidal spring and the internal resultant forces acting alone. The improved driven pulley generates a high initial gripping force while having a reasonably low gripping force at high speed for good efficiency.

REFERENCES:
patent: 3266330 (1966-06-01), Galleher
patent: 3638744 (1972-02-01), Washizawa
patent: 4464144 (1984-08-01), Kobayashi
patent: 4575363 (1986-03-01), Burgess et al.

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