Zf Lenksysteme Gmbh

Peter Ertle

Karl-Heinz Urban

Jens-Uwe Hafermalz

Winfried De Maight

Markus Schuster

Dieter Sauter

Joachim Ilg

A rotary slide valve, in particular for speed-dependent power steering systems in motor vehicles, has a torsion bar, a rotary slide, and a control bushing. The control bushing is pressed onto a pinion and the torsion bar is inserted into a torsion bar bore of the pinion. The control bushing is connected rotation-fast to the pinion by shaping. The torsion bar has teeth that are pressed into the torsion bar bore of the pinion and that connect the torsion bar to the pinion rotation-fast.

Rotary slide valve

A power steering system for motor vehicles, fitted with a rotary disk valve and comprising a reaction piston () defining an active () and a passive reaction chamber (). A servo pressure can be fed to the reaction chamber () in order to modify the actuating force on the steering wheel. A damping piston ()is arranged on the active reaction chamber () in order to receive dynamic oscillations of the reaction pressure.

Power steering system for motor vehicles

In a damping valve for pressure medium-actuated operating circuits, a spring element is installed between housing, cover and counter-contour. In the opening direction, the spring element is pressed against the counter-contour by the pressure medium flowing through, so that a flow passage cross-section allowing almost unimpeded passage of the pressure medium is obtained. In the opposite direction, the throttling direction, the spring element rests on the cover and blocks the flow of the pressure medium until a well-defined pressure builds up, which lifts the inner side of the spring element from the counter-contour and thus opens a reduced flow passage cross-section.

Damping valve for power steering

A rotary disk valve for motor vehicle power steering systems includes rotary disk which is connected non-rotatably to a valve inlet element. A control bushing is connected non-rotatably to a valve outlet element. These two valve elements are disposed so that they are coaxially movable into one another and are rotatable by at most the amount of torsion of a dead travel coupling. The two valve elements have longitudinal control grooves, which interact with one another for controlling a pressure medium to and from two working areas of a servo motor and to a return connection for a pressure medium container. The rotary disk is connected via a torsion bar spring to the valve outlet element. The longitudinal control grooves of the radially internal valve element connected to the return connection are connected to an internal space of the radially internal valve element. The torsion bar spring is supported in this internal space via a roller bearing. The return from the inner space of the radially internal valve element to the return connection occurs through the roller bearing and through the dead travel coupling.

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Durlangen, Germany

Peter Ertle