| 摘要 |
PCT No. PCT/EP93/02082 Sec. 371 Date Feb. 16, 1995 Sec. 102(e) Date Feb. 16, 1995 PCT Filed Aug. 5, 1993 PCT Pub. No. WO94/04829 PCT Pub. Date Mar. 3, 1994A hydraulic control device having a directional valve by means of which the direction of movement and the speed of a hydraulic consumer, especially a mobile working device can be modified. The hydraulic control device has a hydraulic pre-control device by which a control pressure can be applied, via a first control line, to a first control chamber and, via a second control line, to a second control chamber of the directional valve, and having valve arrangement in a first control line by which a largely free flow of control oil is admitted to a first control chamber and by which, by a throttling of the discharge of control oil, the movement of a control slide of the directional valve can be damped. To obtain an effective damping, but to avoid a delay of the start of the movement or of the end of the movement of the working device of a mobile working machine, the damping of the movement of the control slide can be controlled as a function of the control pressure in a first control chamber and/or of the control pressure in a second control chamber.
|
