Drehschieberventil für Hilfskraftlenkungen von Kraftfahrzeugen

摘要

The invention relates to a rotary shift valve (1) for servo-assisted steering systems of motor vehicles. Said valve (1) comprises a rotary disc (2) which is connected to a valve input member (4) in a rotationally-fixed manner. The control bush (3) is connected to the valve output member (5) in a rotationally-fixed manner. The two valve elements are arranged coaxially such that they can move within one another and can be rotated in relation to one another about the rotational travel of a backlash coupling. The rotary disc (2) is provided with external longitudinal control grooves (6, 7) and the control bush (3) is provided with internal longitudinal control grooves (6, 7). Said grooves engage with each other for controlling a hydraulic fluid towards and away from two working chambers of a servomotor. The rotary disc (2) is connected to the valve output member via a torsion-bar spring (9). Manufacturing-related tolerances which can create undesired effects of the performance are compensated by a connection element (10).