VARIABLE-CAPACITY AXIAL-PISTON PUMP Russian patent published in 1999 - IPC

FIELD: hydraulic systems. SUBSTANCE: pistons 7 of cylinder block 6 in pump play the part of actuating member providing changing of angle of inclined plate 8 at change of delivery pressure. For this purpose hole 19 is made in end face distributor 10 in zone of lower land 13 between SUCTION and DELIVERY ports. Hole 19 provides communication of reduced pressure space 17 of command member - spool 16 with chamber 20 of piston 7 in cylinder block 6 when piston is in zone of land 13. This makes it possible to dispense with special actuating member. EFFECT: simplified design and increased reliability of pump, reduced mass and overall dimensions. 2 dwg