Zahnradfabrik Friedrichshafen, Ag.

Zf Friedrichshafen Ag

Zf Friedrichshafen

Armin Lang

Helmut Knodler

Rolf Fassbender

Walter Cerny

Karl-Heinz Liebert

Wolfgang Walter

Wilfried Leutner

Stefan Frohlich

Falk Kurz

J&uuml;rgen Sch&uuml;le

Wolfgang Abele

Bernhard Schweizer

In a power steering gear for motor vehicles, a control device (,) is used to control an adjusting element (,) for changing the steering characteristics as a function of the road speed of the motor vehicle. In the process, in addition to the road speed, the chronological change of the road speed, i.e. the acceleration and deceleration, is taken into account when controlling the adjusting element (,). A differentiation element (,) is arranged in the control device (,) parallel with an element (,) for detecting the road speed. Both the clement (,) for detecting the road speed as well as the differentiation element (,) supply their signals to a device (,) for signal processing.

Controller for a motor vehicle servo-assisted steering system

Power steering gear intended in particular for motor vehicles

Servo-assisted steering system

Hydraulic steering arrangement

Rack servo-steering, particularly for motor vehicles

Power assisted steering system, in particular, for motor vehicles

Power-assisted steering for motor vehicles

Proportional valve control unit for auxiliary power steering

In an auxiliary power steering intended especially for motor vehicles, a pinion (2) positioned in a steering housing (1) engages a steering rack (9). A steering valve (14) that is used to control the pressure medium for the auxiliary power steering provides two inlet-seat valves (15, 16) and two outlet-seat valves (17, 18) whose closing bodies (20, 21, 35, 36) can be shifted in the axial direction by a rotary movement of a steering spindle. Closing bodies (20, 21) of inlet-seat valves (15, 16) can be biased in the closing direction by the force of pressure springs (22, 23). In the process, pressure springs (22, 23) bias the closing bodies (20, 21) of inlet-seat valves (15, 16) only if the particular outlet-seat valves (17, 18) are in their neutral position. Each pressure spring (22, 23)--when steering valve (14) is in the neutral position--keeps closing body (20, 21) of the particular inlet-seat valve (15, 16) resting against a valve seat (26, 27) that is fixed on the housing. When steering valve (14) is shifted from its neutral position, then one of the outlet-seat valves (17, 18) in each case will lift the pressure spring (22, 23) of the particular inlet-seat valve (15, 16) over the disc (24, 25) and off the closing body (20, 21) of inlet-seat valve (15, 16).

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Schwabisch Gmund, Germany

Armin Lang