HYDRAULIC DRIVE Russian patent published in 1995 - IPC

FIELD: hydraulics. SUBSTANCE: first dispenser is connected with the pump through throttle and first check valve connected in series. The line connecting the throttle with first check valve is in communication with the outlet of the pilot-operated check valve. The baffle is mounted inside the housing of the pilot-operated check valve to define a closing space. The closing space is interposed between the control space and inlet of the pilot-operated check valve and is in communication with the drain line through the second dispenser when the dispenser is in the neutral position and with the delivery line when the dispenser is in the other position. The outlet of the pilot-operated check valve is coupled with its closing space through the third check valve and throttle connected in series. The throttles of the under-piston spaces of the hydraulic cylinders are interconnected through a pipe line connected with the line connecting the second check valve with the pilot-operated check valve. The inlet of the pilot-operated check valve is in communication with the drain line. The above-piston space of the other hydraulic cylinder is in communication with the drain line when the first dispenser is in the neutral position and with the delivery line when the dispenser is in the other position. The control space of the pilot-operated check valve is in communication with the outlet of the shuttle valve. The inlets of the shuttle valve is connected with the hydraulic lines connecting under- piston spaces of the hydraulic cylinders with the first dispenser. The second and the third check valves are connected to the outlet of the pilot-operated check valve through the inlet and outlet respectively. EFFECT: enhanced reliability 2 cl, 1 dwg