FIELD: machine building.
SUBSTANCE: invention relates to hydraulic drive and may be used in material handling and tooling as clamps. Said jack incorporates controlled magneto-fluid devices to increase viscous friction made up of screw-nut pair, 9, 16 and thrust bearing 10 wherein magnetic fluid is used for lubing. Note here that control system 22 incorporates converter amplifier 29 with two solenoid coils 30, 31 connected thereto. Coil 30 is arranged on thrust bearing 10 of screw 7 while coil 31 is arranged on screw 9. Note also that converter amplifier 29 is connected to control system command device. In braking, rod 11 is stopped not only by standard braking device but with the help of aforesaid controlled magneto-fluid devices that creates resistance in zone of electromagnetic solenoid coils 30 and 31.
EFFECT: higher accuracy of locking screw jack output rod.
1 dwg
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