Servo-valve arrangement for power steering

Details Servo-valve arrangement for power steering Servo-valve arrangement for power steering

1988-07-01

1990-02-06

Garrett, Robert E.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

91372, 91374, F18P 910, B62D 0000

Patent

active

048980749

ABSTRACT:
In a servo-valve arrangement, a control piston is displaced as a function of steering forces to be applied which control piston in its turn controls throttling places in such a manner that a piston-cylinder aggregate is acted upon with a pressure difference and produces a force assisting the steering movement. A throttling section connected in parallel with the piston cylinder aggregate includes throttling places controlled by external parameters as well as by the system pressure and makes it possible to act upon the end faces of the control piston with a pressure difference in order to permit a force opposing the respective displacement of the control piston to act on the control piston. As a result thereof, an undesired overcontrol of the servo-valve arrangement, respectively, of the steering system controlled thereby is avoided.

REFERENCES:
patent: 2679234 (1954-05-01), Robinson
patent: 4531602 (1985-07-01), Roehringer
patent: 4651622 (1987-03-01), Yoshida
patent: 4665797 (1987-05-01), Bacardit
patent: 4766801 (1988-08-01), Hachisuka

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