| 摘要 |
PURPOSE:To make the said pressing force maintainable in a proper manner at the time, by securing the pressure force of a vane against the inner wall of a cylinder with such centrifugal force as acting on the vane and lubricating oil pressure in time of low-speed operation, while in time of high-speed operation, making full use of the centrifugal force, through the lubricating oil force is reduced to some extent. CONSTITUTION:At an oil feed passage for giving pressing force to a vane 7, there are provided with a ball valve tappet 27 receiving an action of centrifugal force by operation of a compressor, an oil feed port 26 of a lubricating oil passage 22 in front and in the rear of the ball valve tappet 27, a slide chamber oil feed port 29 installed in a valve seat 28 and a spring 25 which presses the ball valve tappet 27 to the oil feed port 26 in time of stoppage. With this formation, the pressing force against the inner wall of a cylinder 1 of the vane 7 is secured through such centrifugal force as acting on the vane 7 and lubricating oil pressure in time of low-speed operation, while in time of high-speed operation, lubricating oil flowing into a vane slot is intercepted, reducing the forward pressing force produced by the pressure of lubricating oil, and on the other hand, the growing centrifugal force of the vane 7 is increased instead, thus the pressing force is always properly kept up. As a result, wear in the inner wall of the cylinder 1 can be reduced and a significant improvement in durability is made possible.
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