| 摘要 |
PROBLEM TO BE SOLVED: To provide an oil pump capable of suppressing a rise of drive torque, by suppressing intermediate land pressure.SOLUTION: An oil pump is equipped with a suction port 9 which opens to a hydraulic chamber, and leads a hydraulic fluid to a pump chamber 8; a first discharge port 10 provided on a rear side in a rotating direction of a rotator 3 than the suction port; a second discharge port 11 provided on a rear side in a rotating direction of the rotator than the first discharge port; an intermediate port 12 which opens to the hydraulic chamber, and is provided between the first discharge port and the second discharge port; a first outside passage 31 which is provided on the outside of the hydraulic chamber, and connects the intermediate port and the first discharge port; a second outside passage 32 which is provided on the outside of the hydraulic chamber, and connects the intermediate port and the second discharge port; and an operation valve 40 which is electrically drive-controlled by a control portion 152, and opens/closes the first outside passage and the second outside passage.SELECTED DRAWING: Figure 9 |
