PURPOSE: To prevent twisting of a cam ring, by a method wherein a groove, which is positioned at the outer end part of a suction port, partitioned from a suction port, and communicated to a discharge port, is provided in the one side of the cam ring.
CONSTITUTION: A circular groove 100, positioned at the outer peripheral part of a suction port and partitioned by the suction port 19, is provided in the one side of a cam ring 13, and the groove 100 is communicated with a discharge port 18. The cam ring 13 is pressed against the discharge port 18 side by means of a pressure in the discharge port 18, but the end part of the suction port 19 side is pressed by a discharge pressure guided through the groove 100. This enables prevention of twisting of the cam ring 13.
FUJIKAWA TADASHI
EGUCHI SHINSUKE
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