It is well known that the mechanical friction torque caused by various frictional forces acting between the machine elements of a pump occupies a great part of the driving torque of a rotary-vane type vacuum pump.
In this study, we attempted experimentally the quantitative analysis of the mechanical friction torque, and clarified its components. As a result, we found that the friction torque, which was generated between the vane-tips and the sliding surface of the stator, became overwhelmingly large with the increase of rotational speed.
Further, we considered the part consisting of the vane-tip and the surface o f the stator as a lubricated slider bearing, and tried to apply the Reynolds equation to this part Having investigated the experimental results, it was found that the lubrication mode at the vane-tips from fluid lubrication to mixed lubrication as the load due to the centrifugal force in creased. However, the theoretical results, which were obtained according to the Reynolds equation, agreed approximately with the experimental values, so that, it became evident that the Reynolds equation can be applied to calculate the frictional force generated at the vane-tips.

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