CLOSED-CIRCUIT HYDRAULIC DRIVE MECHANISM

Fluid is delivered by variable-displacement pump 1 from one end of power cylinder 2 to the other end, reciprocating the piston and the machine tool table, rigidly attached to the piston rod. Surplus fluid from the right end of cylinder 2 is exhausted through check valve 5 to tank 3. On the reverse stroke, when fluid is drawn in from the left end of the cylinder and delivered to the right end, the …