Machine element or mechanism – Gearing – Toothed gear and recirculated unconnected elements
Patent
1976-11-18
1978-07-25
Gerin, Leonard H.
Machine element or mechanism
Gearing
Toothed gear and recirculated unconnected elements
F16H 5552
Patent
active
041022149
ABSTRACT:
A centrifugal clutch and variable-speed pulley has a movable pulley flange mounted for both axial and rotational movement relative to a fixed flange. The fixed flange hub has a cylindrical primary bearing at the opposite side of the pulley groove from the flange and has a hub extension of reduced diameter which provides an elongated outboard bearing surface. The movable flange is on a hub sleeve which has an elongated internal bearing liner engaging the primary bearing and has an outboard bearing riding on the hub extension surface. The hubs have counterbores defining a spring chamber about the hub extension, where a spring acts to urge the flanges apart. Thrust faces on the hubs, radially outward of the spring, come together to limit flange closing movement. Plastic disk-shaped centrifugal weights mounted in angularly spaced channels on the back of the movable flange are normally under preload against a reaction cone on the hub extension, to limit opening movement of the flanges and to provide initial frictional torque drive between the movable flange and the cone. Centrifugal force drives the weights outward along the cone to urge the flanges together. A threaded joint between the hub extension and the fixed flange hub receives spacers to shift the opening limit while maintaining the preload and initial torque drive. A spacer between the hub thrust faces shifts the closing limit position. Equal spacers maintain the same throw while varying the pulley groove width to suit different width belts.
REFERENCES:
patent: 2715842 (1955-08-01), Humuth
patent: 2987934 (1961-06-01), Thomas
patent: 3362242 (1968-01-01), Watkins
patent: 3599504 (1971-08-01), Taylor
patent: 3680403 (1972-08-01), Schpan
patent: 4028953 (1977-06-01), Lavallee
Gerin Leonard H.
Hoffco Inc.
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