| 摘要 |
A pressure medium control means for hydraulic servo-steering devices with a pressure source and preferably a hydraulic pressure accumulator in which means there is provided a control valve having a four-way control and one or preferably two control pistons for selectively connecting the working spaces of a servo motor with a pressure source or return pipe to a reservoir, in which the servo motor is operably related to a power outlet member affecting the steerable wheels, with the power outlet member per se being connected with a power inlet member via a resilient, preferably pre-stressed coupling means, and in which the control piston or pistons is or are provided with reaction areas stressed by the pressures from the working spaces of the servo motor, or are in operative relation with respective reaction members and are actuable via actuating elements by virtue of relative movements between the power inlet member and the power outlet member.
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