| 摘要 |
<p>PURPOSE:To prevent two system pressure fluides from being mixed with each other, by forming two annular grooves in a part between two peripheral sections in the outer peripheral surface of a pintle, and by communicating the two annular grooves with two suction ports, respectively through holes. CONSTITUTION:When a cylinder block is rotated by means of a shaft 22 and an Oldham's coupling, a plunger 17 is reciprocated to change the volume of a pressure variation chamber 8. Further, the volume of the pressure variation chamber 18 is increased as the pressure variation chamber 18 is communicated with passages 11, 13 so that oil is sucked through suction ports 7, 8 while the volume of the chamber 18 is decreased as the chamber 18 is communicated with passages 12, 14 so that oil is discharged through discharge ports 9, 10. At this time oil which leaks from the passages 11, 12 to the outer peripheral surface of a pintle 6, flows into a first annular groove 24 and therefore returns into the first suction port 7 through a hole 26, and oil which leaks from the passage 13, 14 to the outer peripheral surface of the pintle 6 flows into a second annular passage 25 and returns into the second suction port 8 through a hole 27.</p> |
