SYNCHRONOUSLY-CONTROLLED HYDRAULIC SYSTEM Russian patent published in 2000 - IPC

FIELD: machine building; road building machines with synchronous control and converted to hydraulic operation. SUBSTANCE: proposed hydraulic system is power variable-capacity hydraulic pump with control spool sensitive to load and sucking working liquid from tank and delivering in into power hydraulic line protected by safety valve. It has hydraulic distributor with main three-position spool with one pressure inlet, two drain lines, two working outlets and two lines, each connecting, in extreme position of spool, working power outlet with line LS (load line) protected by safety valve and connected with control spool of hydraulic pump. Check valve with throttle is built into each control line of main spool. Pressure compensator is main nine-line spool, each of its working loaded outlets in operating position of spool being connected through additional line and check valve with line LS accommodating plunger at each end. Working load pressure is delivered to plunger from side of control pressure delivery in one of extreme positions of main spool. Pressure of LS line is delivered to plunger from opposite side through normally closed two-position spool opened by control pressure. Area of through section from pressure line to working outlet backwards can be proportional to square root of pressure differential under plungers inside main spool. EFFECT: simplified design of hydraulic system. 2 cl, 1 dwg