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
1988-09-20
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
74868, F16H 1102
Patent
active
047722495
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 shift-control valve receiving a first line pressure from said pressure source to one of the cylinders, while simultaneously permitting a flow of the fluid from the other cylinder. A second pressure line is connected to the shift-control valve to receive therefrom a pressure of the fluid flowing from above-indicated other cylinder. A pressure regulating valve regulates the pressure in the second pressure line, as a second line pressure lower than said first line pressure. The control system further includes at least one one-way by-pass line or restricted by-pass line which connects the second pressure line to at least one of the two cylinders, respectively. Each by-pass line permits a flow of the fluid from the second pressure line to the corresponding cylinder, or a restricted flow of the fluid between the second pressure line and the hydraulic cylinder.
REFERENCES:
patent: 3600960 (1971-08-01), Karig et al.
patent: 4557706 (1985-12-01), Tanaka et al.
patent: 4627313 (1986-12-01), Sakai
patent: 4628773 (1986-12-01), Itoh et al.
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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