System for actuating the displaceable pulley in a continually va

Details System for actuating the displaceable pulley in a continually va System for actuating the displaceable pulley in a continually va

1987-01-08

1988-05-31

Novosad, Stephen J.

Endless belt power transmission systems or components

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

Fluid pressure actuator for adjustment of member

474 18, F16H 1102

Patent

active

047478080

ABSTRACT:
In a belt driven continually variable transmission, the drive ratio is changed by varying the radial position of the drive belt by moving displaceable sheaves of a pulley assembly. A system for actuating the displaceable sheaves includes a ratio control valve supplied with pressurized fluid and connected to a source of ratio control pressure produced by a solenoid actuated valve. An orifice located between the ratio control valve and the hydraulic cylinder in which the displaceable sheave is located has feedback lines located on opposite sides of the orifice. Pressure in the feedback lines produces a differential force on the ratio control valve tending to increase the flow rate to the cylinder when the pressure drop across the orifice decreases.

REFERENCES:
patent: 4534243 (1985-08-01), Yokoyama et al.
patent: 4601681 (1986-07-01), Costelli et al.
patent: 4628773 (1986-12-01), Itoh et al.

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