PURPOSE: To enhance suction efficiency by allowing the operating oil from each suction port at the inside to be discharged to a discharge port, provided at the pump body outside each of the suction ports, by enabling supply for two oil pressure systems and by furnishing a guide vane at the convergent point of this operating oil with excessive control oil.
CONSTITUTION: When pump shaft 3 is rotated, rotors 7, 10 of a front pump 1 and rear pump 2 will rotate at the same time, and the operating oil from suction ports 15, 19 at the center plate 8 be inhaled into the pump chambers 14, 18 to be extruded to discharge ports 16, 20 provided at the front body 5 and rear body 9. These discharged oil undergo rate-of-flow control when it passes through flow controls 30, 32, and are supplied to the oil pressure load independently through outlets 46 and 57. In the place where the operating oil from a suction port 24 converges with the excessive oil from said flow control valves 30, 32, a shunt surface 35 of a guide vane 36 faces the inlets 27A, 27B. Thereby inflow of operating oil is made smooth to eliminate cabitations, which should enhance the suction efficiency.
SHINGYOJI SHIGEO
SASAZAKI MITSUO
MIYAKE SHIGEMI
KAYABA INDUSTRY CO LTD
| JPS6226390A | 1987-02-04 |