HYDRAULIC DRIVE MECHANISM OF A MACHINE TOOL TABLE WITH A VARIABLE-DISPLACEMENT PUMP AND DIFFERENT FORWARD AND RETURN SPEEDS OF TABLE TRAVEL

Fluid is drawn in from tank 1 through suction valve 4 and pipeline a to hydraulic pump 2. In the left-hand position of lever 3, turning about fixed axis A, pump 2 delivers fluid to the left end of cylinder 5, moving piston 6, piston rod 7 and table 8, attached to the piston rod, to the right. From the right end of cylinder 5, fluid is discharged through pipeline b to tank 1. In the right-hand posi…