| 摘要 |
PROBLEM TO BE SOLVED: To provide a variable displacement pump capable of approximating a pump ejection pressure to a required oil pressure and reducing power loss.SOLUTION: A solenoid switch valve 8 guides an oil pressure to a second control oil chamber 17 via first and second solenoid control ports 55, 56 having orifice effect when an engine rotating at a high rotation. Alternatively, a pilot valve 7 blocks a communication state of an oil pressure introducing port 45 and a first pilot control port 46, brings the above both ports 45, 46 into communication, brings a second pilot control port 47 and a first drain port 48 into communication, and controls the hydraulic pressure of a first control oil chamber 17 when an ejection pressure is increased in the initial position where a first spool valve 42 is biased by a first valve spring 44 and moves to the maximum right direction. |
