Abstract
Performance of a vane compressor used for automotive air conditioners is affected greatly by frictional losses on sliding parts of the vane. In order to estimate these losses exactly, analysis taking account of lubricating characteristics is needed, because the friction has a close relation with the lubricating condition which changes from boundary lubrication to hydrodynamic lubrication on some conditions. In this paper we elucidated the lubrication on the vane tip of a through-vane compressor by measuring coefficient of friction on that point, and evaluated the lubricating characteristics on sliding parts of the vane by applying the measured result, and then estimated frictional losses. As a result, we identified that lubricating condition is severe at low rotational speed, and that frictional loss at the vane tip under the variable condition of the coefficient of friction is smaller than that under the constant coefficient condition.
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