| 摘要 |
PROBLEM TO BE SOLVED: To prevent cavitation erosion from being generated on the metallic front surface caused by collision of a fluid from a cutout groove or an oil introducing hole with an opening part inner wall surface of a piston chamber. SOLUTION: A cutout groove 30 or an oil introducing hole is diagonally provided on a low-pressure port 20 and/or a high-pressure port 21 in relation to a slide surface of a valve plate 17 positioned in an extension part of the low-pressure port 20 and the high pressure port 21 and to be slid on a cylinder block 13, and therefore, the direction of jets generated in opening of the cutout groove 30 or the oil introducing hole on the high-pressure side is turned toward the inside of a piston chamber 12.
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