| 摘要 |
A cylinder 2 , a roller 4 , an upper bearing member 7 and a lower bearing member 8 form a space, the space is partitioned by a vane 5 into working chambers 12 . Working fluid is sucked into the working chamber 12 through a suction hole 7 c, the working fluid is expanded in the working chamber 12 whose volume is varied by rotation, and the working fluid is discharged from a discharge hole 2 b into a discharge space 20 . A differential pressure regulating valve 21 which is opened when pressure in the working chamber 12 is higher than pressure in the discharge space 20 is provided in the discharge hole 2 b. With this, repressing can be carried out even if excessive expansion of working fluid is generated. Therefore, excessive expansion loss can be prevented.
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