| 摘要 |
PCT No. PCT/EP88/01034 Sec. 371 Date Apr. 18, 1990 Sec. 102(e) Date Apr. 18, 1990 PCT Filed Nov. 12, 1988 PCT Pub. No. WO89/04788 PCT Pub. Date Jun. 2, 1989.A hydrostatic auxiliary power steering mechanism with load-dependent performance for controlling a variable displacement pump includes an orifice for generating a pressure difference. A control valve in a valve borehole contains a movable valve piston. Orifice is formed between the discharge opening cross-section of a pressure line into the valve borehole and a central spool land provided on valve piston and reveals a cross-section that can be altered as a function of the position of the control valve. The cross-section of orifice has its smallest value when the control valve is in the neutral middle position and can be made larger by adjusting the control valve in both directions.
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