Endless belt power transmission systems or components – Pulley with belt-receiving groove formed by drive faces on... – Fluid pressure actuator for adjustment of member
Patent
1987-02-19
1989-08-15
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
74869, F16H 1104
Patent
active
048570346
ABSTRACT:
A hydraulic control system for a continuously variable transmission for an automotive vehicle, the transmission having a first and a second variable-diameter pulley provided on respective first and second shafts, a belt connecting the first and second pulleys, and a first and a second hydraulic cylinder for changing effective diameters of the first and second pulleys. The control system includes a first pressure regulating valve for regulating the pressure of a fluid delivered from a pressure source, and thereby establishing a first line pressure, a shift-control valve for applying the first line pressure to one of the first and second cylinders, while simultaneously permitting a flow of the fluid from the other cylinder, thereby changing the effective diameters of the first and second pulleys, and a second pressure regulating valve for regulating the pressure of a discharge flow of the fluid flowing from the above-indicated other cylinder through the shift-control valve, and thereby establishing a second line pressure lower than the first line pressure.
REFERENCES:
patent: 3600960 (1971-08-01), Karig
patent: 4152947 (1979-05-01), van Deursen et al.
patent: 4403975 (1983-09-01), Rattunde
patent: 4475416 (1984-10-01), Underwood
patent: 4669336 (1987-06-01), Okada et al.
Kouno Katsumi
Okawa Susumu
Soga Yoshinobu
Sugaya Masami
Bui Thuy M.
Toyota Jidosha & Kabushiki Kaisha
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