VARIABLE-CAPACITY AXIAL PISTON PUMP Russian patent published in 2002 - IPC

FIELD: mechanical engineering; hydraulic systems. SUBSTANCE: proposed pump has housing, drive shaft, cylinder block with pistons, safety and relief valves, control member with position pickup on its axle, pump control system including control pressure source, two control cylinders with pistons and zero-setting springs, each cylinder being provided with two working spaces, five-line three-position distributor of mechanical input provided with feedback from control member, and articulated coupling of mechanical input and zero setter. First and second control lines of mechanical input distributor are connected with first working spaces of control cylinders, third and fifth control lines are connected with drain. First working spaces of control cylinders communicate through distributor with drain, and pump control unit communicates with two inputs and output. First input is connected with control signal and second input of control unit is connected to output of control member position pickup. The following devices are introduced into pump control systems: five-line four-position electrohydraulic distributor with spool position pickup. Control unit with third additional input, non-linear converter. Output of spool position pickup is connected through non-linear converter to third additional input of control unit. Output of control unit is connected with input of electrohydraulic distributor. First and second control lines of electrohydraulic distributor are connected with second working spaces of control cylinders. Third control line is connected with control pressure source. Fourth control line is connected with drain. Fifth control line is connected with fourth control line of mechanical input distributor and it communicates through electrohydraulic distributor with control pressure source. Second inputs of control cylinders communicate with drain. EFFECT: reduced overall dimensions of pump, simplified design. 2 cl, 3 dwg