Hydraulic control means, particularly for vehicle steering means

Details Hydraulic control means, particularly for vehicle steering means Hydraulic control means, particularly for vehicle steering means

1976-11-24

1978-01-03

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Manual pump pressurizes fluid to position output motor...

60386, F15B 1518

Patent

active

040659216

ABSTRACT:
The invention relates to a hydraulic control unit for a servomotor of the type used for vehicle steering systems. The unit has a control circuit with a power operated pump and a hand operated metering motor and an operating circuit with a power operated pump. The two circuits intersect upstream from the servomotor. A pressure comparison, throttling and proportioning valve is disposed between the outlets of the two pumps of the control and operating circuits. The proportioning valve is controlled by a differential pressure applied by the pumps and a spring which supplements the operating pump pressure. In the normal operating mode the proportioning valve allows a minor fractional flow of the pressurized fluid generated by the control pump to flow through the valve to the operating circuit. Under varying conditions when either of the pumps become wholly or partially inoperative the proportioning valve provides for an increased flow from the unaffected circuit to the disabled circuit to maintain a degree of operation until such time that the breakdown has been cured.

REFERENCES:
patent: 3218805 (1965-11-01), Pruvot
patent: 3436915 (1969-04-01), Mercier
patent: 3600893 (1971-08-01), Hudgens

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