Control valve system for a continuously variable belt driven tra

Details Control valve system for a continuously variable belt driven tra Control valve system for a continuously variable belt driven tra

1986-07-21

1988-03-29

Wright, Dirk

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74866, 474 28, B60K 4112, B60K 4116, B60K 4118

Patent

active

047335823

ABSTRACT:
A control valve system for controlling the operation of a continuously variable belt-driven motor vehicle transmission includes a first hydraulic pump that supplies fluid to the displacement cylinders of the transmission through a main pressure regulating valve and a transmission ratio control valve as a function of the setting of the manual selector valve and as a function of the torque requirement and speed of the vehicle. The torque converter is supplied with hydraulic fluid by way of a relief valve which comes into operating in the event of failure of an electronic control unit and a decrease in the vehicle speed. A first emergency operation on/off valve transmits torque at converter discharge pressure, by way of a second emergency on/off valve, as emergency operation control pressure to a transmission ratio control valve.

REFERENCES:
patent: 2903910 (1959-09-01), Carnegie
patent: 3646836 (1972-03-01), Kubo et al.
patent: 4536171 (1985-08-01), Tanaka et al.
patent: 4545265 (1985-10-01), Abo et al.
patent: 4559850 (1985-12-01), Sakakibara
patent: 4610183 (1986-09-01), Nobumoto et al.
patent: 4631043 (1986-12-01), Tokoro et al.
patent: 4638689 (1987-01-01), Sakai

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