| 摘要 |
PROBLEM TO BE SOLVED: To reduce the noise of a pump motor by unequalizing an interval between the cylinders adjacent to each other in a circumferential direction, bilateral symmetrically to a center line of a cylinder block which is perpendicular to an axis of one cylinder, in a pump where plural pistons are reciprocated by the rotation of the cylinder block. SOLUTION: Pistons 8 are respectively inserted into plural cylinders of a cylinder block, and the pistons 8 are reciprocated by the rotation of the cylinder block 3. Each cylinder comprises a kidney port 13, and each volume chamber 7 is communicated with an inflow port or an outflow port of a valve plate 11 corresponding to an angle of rotation of the cylinder block 3. On this occasion, the cylinders 6 are mounted clockwise and anticlockwise with anglesθ1 -θ4 in the same order from a center shaft (q) of the cylinder 6 where the center line P of the cylinder block passes, and the cylinders 6 passing on the center line P has an angleθ5 . Each kidney port 13 is positioned corresponding to the angular position of each cylinder 6 on the same circumference on the axis of rotation 5.
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