Rotary disk valve for power steering systems of motor vehicles

US6267144A · kind A · utility

Assignee

• ZF Lenksysteme GmbH · DE

Inventors

• Jens-Uwe Hafermalz · Lorch, DE
• Peter Ertle · Durlangen, DE
• Karl-Heinz Urban · Spraitbach, DE
• Winfried de Maight · Mutlangen, DE

Key dates

• Filing date: Nov 16, 2000
• Grant date: Jul 31, 2001
• Expiry date: Nov 16, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/86654
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A rotary slide valve (1) for power steering in motor vehicles contains a rotary slide (2), which is non-rotatably connected to a valve inlet member (4). The control bushing (3) is non-rotatably connected to a valve outlet member (5). The two valve elements are disposed so that they can move coaxially inside each other and can be maximally rotated in relation to each other over the rotational path of a lost motion coupling. The outside of the rotary slide (2) and the inside of the control bushing have control longitudinal grooves (6, 7), which cooperate with one another in order to direct a pressure fluid to and from two working areas of a servomotor The rotary slide (2) is connected to the valve outlet member (5) by means of a torsion bar spring (9). Manufacture conditional tolerances that can lead to undesirable effects in the driving behavior are compensated for by means of a play-free suspension connection (10).