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

1989-09-15

1990-08-14

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

049483706

ABSTRACT:
A continuously variable transmission has a drive pulley, a driven pulley, a belt engaged with both pulleys, a transmission ratio control valve having a spool for controlling oil supplied and drained to and from a cylinder of the drive pulley. A check valve is provided in a drain passage for the drain oil. The check valve has a drain port and a spool provided for closing the drain port. A shift lock device is provided to shift the spool so as to close the drain port when wheels of a vehicle are locked, thereby preventing the belt and pulleys from shifting to a larger transmission ratio position.

REFERENCES:
patent: 4510822 (1985-04-01), Yamamuro et al.
patent: 4534243 (1985-08-01), Yokoyama et al.
patent: 4627313 (1986-12-01), Sakai
patent: 4669336 (1987-06-01), Okada et al.

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