Transmission ratio control system for a continuously variable tr

Details Transmission ratio control system for a continuously variable tr Transmission ratio control system for a continuously variable tr

1988-04-18

1989-07-25

Bui, Thuy M.

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 1102

Patent

active

048509361

ABSTRACT:
A continuously variable transmission has a drive pulley having a hydraulically shiftable disc and a hydraulic cylinder for operating the disc, a driven pulley having a hydraulically shiftable disc and a hydraulic cylinder for operating the disc, and a belt engaged with both pulleys. The system has a hydraulic circuit having a pump for supplying oil to both the hydraulic cylinders and a drain passage for draining oil in the hydraulic cylinder of the drive pulley, and a transmission ratio control valve having a spool for controlling the oil supplied to the cylinder of the drive pulley and the oil drained from the cylinder to change the transmission ratio. A cam is provided for shifting the spool of the transmission ratio control valve in accordance with depression of an accelerator pedal of a vehicle, and a variable orifice is provided in the drain passage for controlling flow rate of drain oil from the cylinder of the drive pulley. The orifice is arranged to reduce the flow rate of drain oil when the magnitude of the depression of the accelerator pedal is large.

REFERENCES:
patent: 4627313 (1986-12-01), Sakai
patent: 4628773 (1986-12-01), Itoh et al.
patent: 4669336 (1987-06-01), Okada et al.

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