Patent ID: 6216718
Filing Date: 2001-04-17
Classification: B62D,Y10T

Abstract:
A method for reducing the spread on the torque of a control valve for motor vehicle hydraulically-assisted steering, the control valve comprising, arranged along its longitudinal axis, a pinion that is designed to mesh with a power-assisted steering rack, a torsion bar connected to the pinion by a rigid connection at one end, a tubular spool mounted around the torsion bar and connected to the other end of said torsion bar by a connecting element, particularly a pin, and a sleeve partially surrounding the spool and connected angularly to the pinion, hydraulic fluid control grooves being formed in the sleeve and in the corresponding region of the spool, which method consists, for each control valve produced, in adapting the stiffness of the torsion bar and/or of the connection between this torsion bar and the spool of the control valve according to the difference between the valve law or power-assistance law measured for this valve and the theoretical law for the type of control valve concerned.