| 摘要 |
PROBLEM TO BE SOLVED: To reduce rotational power of the rotor and improve compression efficiency and fuel consumption by installing in an oil passage an oil throttle valve for throttling the opening area of the oil passage according to the revolution of the rotor. SOLUTION: An oil throttle valve 30 is slidably inserted into a through hole 6c formed in a rear side block 6 between an oil passage 21 and a discharge communication passage 23. When a rotor is rotated, low pressure refrigeration gas is compressed. At the same time, lubricating oil A is supplied from an oil reservoir chamber 20 to a vane back pressure chamber through the oil passage 21 due to the pressure difference between an intake chamber or the cylinder chamber, and a discharge chamber 18. Discharge jet of the high pressure refrigeration gas increase in proportion to the rotor revolution and acts on the oil throttle valve 30. Accordingly, the opening area of the oil passage 21 is throttled in accordance with the increase in the rotor revolution and the supply amount of the lubricating oil A to the vane back pressure chamber is controlled.
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