Centering device for a servo valve of a power steering device

Details Centering device for a servo valve of a power steering device Centering device for a servo valve of a power steering device

1990-12-12

1992-05-26

Marmor, Charles A.

Motor vehicles

Including one or more ski-like or runner members

With at least one surface-engaging propulsion element

180132, 91375A, 464 97, B62D 510

Patent

active

051158795

ABSTRACT:
A power steering device comprising an input shaft connected to a steering shaft, an output shaft connected to a rack for driving vehicle wheels, a servo valve including a valve sleeve surrounding the input shaft and engaging the output shaft, and a torsion bar with both ends secured to the input shaft and the output shaft. In the power steering device, the torsion bar is positioned and secured via a balance pin in the input shaft. The balance pin has multiple projecting portions arranged alternately on opposite sides of the balance pin along the length of the balance pin. After inserting the balance pin into the input shaft and the torsion bar, the input shaft and the torsion bar are relatively rotated by the protruding portions of the balance pin. The servo valve is thus correctly centered. The hydraulic pressure produced by the servo valve is balanced.

REFERENCES:
patent: 3742807 (1973-07-01), Manning
patent: 3844663 (1974-10-01), Prette
patent: 4473204 (1984-09-01), Bohm
patent: 4699174 (1987-10-01), Bishop

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