Belt-and-pulley type continuously variable transmission and meth

Details Belt-and-pulley type continuously variable transmission and meth Belt-and-pulley type continuously variable transmission and meth

1988-04-29

1990-02-27

Bui, Thuy M.

Endless belt power transmission systems or components

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

Speed responsive

74867, 474 18, 474 28, F16H 1102

Patent

active

049042297

ABSTRACT:
A control method controls a belt-and-pulley type continuously variable transmission having drive and driven pulleys mounted respectively on input and output shafts, a V-belt trained around the drive and driven pulleys, and an oil pressure source and an oil reservoir operatively coupled to first and second hydraulic pressure chambers for axially moving the movable conical members of the drive and driven pulleys to vary effective diameters of the drive and driven pulleys for thereby controlling a speed ratio. The movable conical members of the driver and driven pulleys are movable in synchronism with each other. The hydraulic pressure chamber of one of the driver and driven pulleys, the effective diameter of which is to become larger at that time, is first brought into communication with the oil pressure source. The hydraulic pressure chamber of the other of the drive and driven pulleys, the effective diameter of which is to become smaller at that time, is brought into communication with the oil reservoir, no earlier than the communication of the hydraulic pressure chamber of the one of the pulleys to the oil pressure source, for thereby starting to move the movable conical members.

REFERENCES:
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patent: 4519790 (1985-05-01), Yamamuro et al.
patent: 4522086 (1985-06-01), Haley
patent: 4533340 (1985-08-01), Abo et al.
patent: 4534243 (1985-08-01), Yokoyama et al.
patent: 4547178 (1985-10-01), Hayakawa et al.
patent: 4560369 (1985-12-01), Hattori
patent: 4619157 (1986-10-01), Sakai
patent: 4673379 (1987-06-01), Ohzono et al.
patent: 4716791 (1988-01-01), Ohzono et al.

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