Control system for an infinitely variable transmission

Details Control system for an infinitely variable transmission Control system for an infinitely variable transmission

1984-08-30

1987-04-14

Levy, Stuart S.

Endless belt power transmission systems or components

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

Speed responsive

74866, 474 28, B60K 4114, F16H 1106, F16H 5556

Patent

active

046575227

ABSTRACT:
A control system for an infinitely variable belt-drive transmission comprises a primary pulley having a hydraulically shiftable disc, a secondary pulley having a hydraulically shiftable disc, a belt engaged with both pulleys, and a hydraulic circuit having a pump for supplying oil. A transmission ratio control valve is provided to be responsive to engine speed for controlling the oil and for shifting the disc of the primary pulley to change the transmission ratio, and a pressure regulator valve is provided to respond to the transmission ratio for increasing the pressure of the oil with an increase of the transmission ratio. A pickup is provided to produce pulses dependent on engine speed, and a electric circuit is responsive to the pulses for producing pulses. An electromagnetic valve is provided to respond to the pulses for draining the oil applied to the transmission ratio control valve thereby controlling the valve so as to provide at least two transmission ratio characteristics.

REFERENCES:
patent: 4369675 (1983-01-01), van Deursen
patent: 4387608 (1983-06-01), Mohl et al.
patent: 4459879 (1984-07-01), Miki et al.
patent: 4462275 (1984-07-01), Mohl et al.
patent: 4487303 (1984-12-01), Boueri et al.
patent: 4506563 (1985-03-01), Hiramatsu

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