Dual rotary valve for variable assist power steering gear for au

Details Dual rotary valve for variable assist power steering gear for au Dual rotary valve for variable assist power steering gear for au

1984-10-22

1986-02-18

Pekar, John A.

Motor vehicles

Including one or more ski-like or runner members

With at least one surface-engaging propulsion element

60468, 91375A, 91437, 13759612, 180143, B62D 508

Patent

active

045707359

ABSTRACT:
A power steering gear mechanism for an automotive vehicle having a pressure operated vehicle steering mechanism controlled by a rotary valve with primary and secondary valve portions wherein the primary valve portion develops a fast-rising steering pressure characteristic for incremental changes in steering torque at low driving speeds and a flatter or more gradual steering pressure rise characteristic for incremental changes in steering torque at high driving speeds, the latter resulting from the action of the secondary valve portion which functions in cooperation with the primary valve portion whereby the pressure versus torque relationship is optimized for parking maneuvers, for driving maneuvers and for center-feel.

REFERENCES:
patent: 4063490 (1977-12-01), Duffy
patent: 4186818 (1980-02-01), Jablonsky
patent: 4189024 (1980-02-01), Jablonsky

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