Servo valve for power assisted steering gear

Details Servo valve for power assisted steering gear Servo valve for power assisted steering gear

1997-09-23

2000-02-08

Swann, J. J.

Motor vehicles

Steering gear

With fluid power assist

180426, 267273, 74388PS, B62D 506, B62D 522

Patent

active

060218649

ABSTRACT:
A servo valve for a power assisted steering gear for producing an auxiliary steering force corresponding to twist between an input member and an output member which are connected to each other by a torsion bar is disclosed. There is provided a sleeve member surrounding a torsion bar and having first and second ends. The first end is prevented from being rotated with respect to the torsion bar. The second end is provided with an opening extending along the radius of the sleeve member. A plunger-containing hole extending in the radial direction is formed in an intermediate part between opposite ends of the torsion bar, and plungers are contained in the containing hole which are movable forward and backward. The plungers are urged forward by a helical compression spring interposed between the plungers. Each of the urged plungers is engaged with an edge of the opening serving as a holding arrangement, to increase the torsional rigidity of the torsion bar at the time when the valve is neutral.

REFERENCES:
patent: 4651622 (1987-03-01), Yoshida
patent: 4769715 (1988-09-01), Futaba et al.
patent: 4774847 (1988-10-01), Breitweg
patent: 5233906 (1993-08-01), Bishop et al.
patent: 5571238 (1996-11-01), Breitweg et al.
patent: 5687810 (1997-11-01), Choi et al.
patent: 5707049 (1998-01-01), Dodak
patent: 5851006 (1998-12-01), Spillner et al.

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