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

1989-02-09

1990-05-08

Bui, Thuy M.

Endless belt power transmission systems or components

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

Speed responsive

474 28, F16H 1106

Patent

active

049234331

ABSTRACT:
A control system for a continuously variable transmission for a motor vehicle has a transmission ratio control valve for controlling the transmission ratio. The system has a drive pulley having a shiftable disc and a hydraulic cylinder for operating the disc, a driven pulley having a shiftable disc and a hydraulic cylinder for operating the disc, a belt engaged with both pulleys. When output torque of an automotive engine increases, the transmission ratio control valve is operated to increase pressure of oil supplied to the cylinder of the drive pulley, thereby preventing the transmission from downshifting.

REFERENCES:
patent: 4672864 (1987-06-01), Morimoto
patent: 4734082 (1988-03-01), Tezuka
patent: 4761153 (1988-08-01), Morimoto
patent: 4764156 (1988-08-01), Ohkumo

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