Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1985-11-26
1987-08-11
Braun, Leslie
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74859, 74864, B60K 4116
Patent
active
046853570
ABSTRACT:
A hydraulic control system for a continuously variable transmission having two variable-diameter pulleys, a belt connecting the pulleys to transmit power from one of the pulleys to the other, and corresponding cylinders for changing effective diameters of the pulleys. The control system comprises: a hydraulic source delivering a pressurized fluid; a first pressure regulating device for regulating the pressurized fluid to apply a first line pressure to one of the cylinders for controlling a tension of the belt; a flow control device for controlling flow of the fluid into and from the other cylinder to change the effective diameters of the pulleys to vary a speed ratio of the transmission; a second pressure regulating device provided between the hydraulic source and the first pressure regulating device to regulate the pressurized fluid to apply a second line pressure to the flow control device, the second line pressure being higher than a pressure in the above-indicated hydraulic cylinder or the first line pressure by a predetermined value; and a releasing device for releasing the second pressure regulating device from its regulating operation while the speed ratio of the transmission is changed with the fluid discharged from the above-indicated other cylinder, or while the speed ratio is held constant.
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Imai Ryuji
Sawada Daisaku
Soga Yoshinobu
Sugaya Masami
Braun Leslie
Diehl Dwight G.
Toyota Jidosha & Kabushiki Kaisha
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