HYDRAULIC DRIVE Russian patent published in 2003 - IPC

FIELD: mechanical engineering; machine tool building. SUBSTANCE: invention can be used in standard-unit-type machines and transfer lines to control hydraulic cylinders of power tables and free spindle carriers at machining. Hydraulic drive of power table contains actuating hydraulic cylinder connected with pressure and drain main lines through feed valve, check valve and hydraulic cylinder differential coupling mechanism including three-position four-line hydraulic distributor and two-position distributor connected by its input to pressure main line and by its output, through restrictor with check valve, to rod space of hydraulic cylinder and through check valve to output of three-position hydraulic distributor. Two-position hydraulic distributor is connected to drain main line through pressure valve. EFFECT: enlarged operating capabilities of hydraulic drive, increased economy. 1 dwg