System for controlling the transmission ratio of an infinitely v

Details System for controlling the transmission ratio of an infinitely v System for controlling the transmission ratio of an infinitely v

1984-11-28

1987-04-21

Leppink, James A.

Endless belt power transmission systems or components

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

Fluid pressure actuator for adjustment of member

74867, F16H 1104

Patent

active

046593217

ABSTRACT:
A system for an infinitely variable transmission having a primary pulley having a hydraulically shiftable disc and a hydraulic cylinder for shifting the disc, a secondary pulley having a hydraulically shiftable disc and a hydraulic cylinder for operating the disc, a belt engaged with both pulleys. A hydraulic circuit has a transmission ratio control valve comprising a spool for selectively shifting the disc of the primary pulley in the downshift direction and upshift direction, and a pressure regulator valve for regulating the oil pressure is operatively connected to the hydraulically shiftable disc to detect transmission ratio during operation. A shifting device is provided for shifting the spool of the transmission ratio control valve in the upshift and downshift direction in dependency on throttle position. A throttle switch is provided to be closed when a throttle valve of the vehicle is widely opened for producing a signal, and a solenoid operated valve responds to the signal and a downshift valve operated in dependence on the operation of the solenoid operated valve so as to forceably shift the spool of the transmission ratio control valve in the downshift direction from a position of said spool determined by the shifting means so as to downshift the transmission.

REFERENCES:
patent: 4419910 (1983-12-01), Miki et al.

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