Steering control apparatus

Details Steering control apparatus Steering control apparatus

1982-05-19

1985-04-02

Garrett, Robert E.

Power plants

Pressure fluid source and motor

Servo-motor having externally operated control valve sets...

60446, 60450, 60452, F16D 3300, F16D 3302

Patent

active

045079200

ABSTRACT:
An improved power steering apparatus includes a variable displacement pump. During a steering operation, a flow control valve effects operation of a motor assembly to vary the displacement of the pump as a function of variations in the demand for power steering fluid. Upon initiation of a steering operation, the displacement of the pump must be quickly increased to enable it to satisfy the impending demand for power steering fluid. Therefore upon initial rotation of a steering wheel, a steering controller restricts a flow of fluid to operate the motor assembly independently of the flow control valve. The displacement of the pump can thus increase before the flow control valve can be actuated during an initial portion of a steering operation.

REFERENCES:
patent: 3742982 (1973-07-01), Miller
patent: 4379389 (1983-04-01), Liesener
U.S. patent application Ser. No. 243,497 entitled "Hydrostatic Load-Sense Steering System", filed Mar. 13, 1981 by Jim L. Rau and Ronald L. LaHue, (copies of drawings attached only).

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