HYDRAULIC SYSTEM OF MOBILE MACHINE Russian patent published in 1995 - IPC

FIELD: hydraulic systems of excavators and cranes. SUBSTANCE: hydraulic system of a mobile machine has a tank, a pump for operative equipment, and a valve. Pressure pipeline of the pump may communicate to rod and piston sections of the hydraulic cylinder through hydraulic distributor. Valve inlet is connected to piston cavity of the cylinder, control cavity and valve outlet are connected to rod cavity of the cylinder and the tank. Hydraulic system is equipped with make-up pump. Suction pipeline of the make-up pump is connected to the tank, and pressure pipeline is connected to suction pipeline of operative equipment pump. This pipeline may be connected the rod and piston cavities of the cylinder through hydraulic distributor. Make-up pump capacity is chosen on the basis of accounting leakage flow rate of the system and compensation for unbalance in volumes of rod and piston cavities of the cylinder. EFFECT: high reliability. 1 tbl