HYDRAULIC SYSTEM OF RUNNING GEAR OF TRACKED TUNNELLING MACHINES Russian patent published in 1995 - IPC

FIELD: mining. SUBSTANCE: hydraulic system of running gear of tracked tunnelling machines has hydraulic pump, hydraulic motors for driving haulage sprockets, hydraulic cylinders for tensioning caterpillars, pressure and return hydraulic lines, reducing, check and safety valves and hydraulic control valves. Pump is communicated hydraulically through hydraulic control valve with hydraulic motors. Pressure hydraulic line communicates outlet of hydraulic pump with inlet of each hydraulic control valve, and it is communicated with inlet of reducing valve. Outlet of reducing valve is hydraulically communicated with inlet of check valve. Outlet of check valve and inlet of safety valve are hydraulically communicated with working cavities of hydraulic cylinders. Outlet of safety valve is hydraulically communicated with return hydraulic line. EFFECT: higher efficiency. 1 dwg