Variable speed transmission

Endless belt power transmission systems or components – Pulley with belt-receiving groove formed by drive faces on... – Speed responsive

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474 18, 474 28, F16H 6100

Patent

active

053991230

ABSTRACT:
The variable speed transmission is for transmitting a torque produced by an engine to a belt. The transmission comprises a shaft connected to the engine, a fixed flange and a movable flange slidably connected to the shaft and substantially rotatable thereon. The flanges define therebetween a groove for receiving the belt. A pressure device is rigidly connected to the movable flange. The pressure device has a pair of pressure units diametrically opposed for pressurizing fluids. Each pressure unit comprises a first fluid chamber, a second fluid chamber, a radially movable partition separating the first fluid chamber from the second fluid chamber, resilient means for applying a return force toward the shaft counterbalancing the centrifugal force, and a fixed partition rigidly connected to the shaft. The fixed partition also separates the first fluid chamber from the second fluid chamber. As the centrifugal force urges the movable partitions away from the shaft, the fluids in the first fluid chambers are urged to circulate away from the shaft, and the fluids in the second fluid chambers are urged to circulate, generating a sliding movement of the pressure device and of the movable flange toward the fixed flange. This sliding movement causes a variable transmission of torque from said engine to the belt.

REFERENCES:
patent: 3782213 (1974-01-01), Rattunde
patent: 3894440 (1975-07-01), Marceau
patent: 4023425 (1977-05-01), Parker
patent: 4143558 (1979-03-01), van Deursen et al.
patent: 4350491 (1982-09-01), Steuer
patent: 5052981 (1991-10-01), Robert
patent: 5108347 (1992-04-01), Gourdon
patent: 5145464 (1992-09-01), Mori

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