HYDRAULIC DRIVE Russian patent published in 1996 - IPC

FIELD: machine tools. SUBSTANCE: piston and rod cavities of a hydraulic cylinder are open through distributor with hydraulic lines to pressure source and dump. Multiplier with two-step piston is installed in the hydraulic line to join piston cavity to the distributor, and is connected with reverse cavity to the hydraulic line to join rod cavity to the distributor. Multiplier is connected by a valve. Through axial passage is originated in the piston. Control member of the valve is made in the form of a rod rigidly fastened to the bottom of low pressure cavity coaxially to reverse valve. The valve is installed in hydraulic line section to connect reverse cavity of the multiplier to the distributor and to rod cavity. EFFECT: high efficiency. 1 dwg