| 摘要 |
PROBLEM TO BE SOLVED: To provide a pressure to a vane groove and to prevent an unbalanced load from applying on a rotor.SOLUTION: Pressure supply grooves 46, 62 comprise: intermediate pressure supply grooves 47, 63 provided at symmetrical positions of both end surfaces 39, 53 of a pair of side blocks 25, opening to a back pressure space at a compression front half position of a compression chamber and supplying an intermediate pressure lower than a discharge pressure and higher than a suction pressure; and high pressure supply grooves 49, 65 provided at symmetrical positions of both end surfaces 39, 53 of the pair of side blocks 25, opening to the back pressure space at a compression latter half position of the compression chamber and supplying the discharge pressure. To the high pressure supply groove 65 on one side, oil stored in an oil reservoir 21 is supplied via a communication passage 61 and an oil supply passage 67a, and to the high pressure supply groove 49 on the other side, the oil is supplied from the high pressure supply groove 65 on the one side via the back pressure space of a rotor. |
