Importance

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Abstract

A power steering system, in particular for motor vehicles, includes a steering valve (15), for controlling a pressure medium for a servomotor, has two inlet seat valves (23, 24) and two outlet seat valves (25, 26), each with one closing body (31; 36). The closing bodies (36) of the outlet seat valves (25, 26) are actuatable via an actuating device as a function of a rotary motion of a steering-wheel shaft connected to an input member (10) of the steering system. The closing bodies (31) of the inlet seat valves (23, 24) are hydraulically pressure balanced with reference to a pressure of a pressure source, and by the force of locking springs (32) they keep the inlet seat valves (23, 24) closed in the neutral position of the steering valve. Each locking spring (32) is supported at one end on a closing body (31) of one of the inlet seat valves (23, 24) and on the other on the actuating device. The outlet seat valves (25, 26) are opened in the neutral position of the steering valve (15). The effective cross section of the closing bodies (36) of the outlet seat valves (25, 26) is smaller than the effective cross section of the closing bodies (31) of the inlet seat valves (23, 24). The steering valve (15) is disposed between the input member (10) and an output member (8) of the steering system. The actuating device has at least one actuating level (27) for actuating the outlet seat valves (25, 26).

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First Claim