Rotary valve for power steering with hydraulic reaction

Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type

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Details

91375A, F15B 910

Patent

active

039981312

ABSTRACT:
A hydraulic power assisted steering system includes a source of pressure fluid fed to a power assist motor. Control of the steering assistance pressure is provided by a valve having two valve elements which are relatively rotatable away from a centered position, subject to restraint imposed by an elastic torque rod. The pressure fluid source has its output branched, one branch supplying the steering assistance motor through and subject to the control of the rotatable valve, and the second branch supplying detent means adapted to increasingly resist relative rotation of the two valve elements in response to increases in pressure of the fluid source. The fluid source pressure increases with increasing relative rotation of the valve elements away from their centered position. Increasing fluid source pressure ultimately effects interlocking of the valve elements when the source pressure reaches a predetermined value. At that point, the torque bar, in effect, ceases being sensitive to increasing torque applied by the driver.

REFERENCES:
patent: 3408900 (1968-11-01), Tomita
patent: 3433127 (1969-03-01), Thompson
patent: 3667346 (1972-06-01), Duffy
patent: 3733967 (1973-05-01), Duffy

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