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

1987-08-26

1988-12-13

Wright, Dirk

Machine element or mechanism

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

Preselected indexed position

192 33, 74867, B60K 4112, B60K 4110

Patent

active

047902167

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: 4051932 (1977-10-01), Arai et al.
patent: 4152894 (1979-05-01), Rumyantsev et al.
patent: 4236617 (1980-12-01), Whateley
patent: 4534243 (1985-08-01), Yokoyama et al.
patent: 4547178 (1985-10-01), Hayakaw et al.
patent: 4669336 (1987-06-01), Okada et al.
patent: 4682578 (1987-07-01), Takada et al.

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