Fog Lubrication of High Speed Ball Bearings (1st Report)

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  • 高速度玉軸受の噴霧潤滑(第1報)
  • コウソクド タマジクウケ ノ フンム ジュンカツ 1

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In pursuit of information concerning the performances of the preloaded ball bearing operating under fog lubrication at high speed, the coefficient of friction and the temperature rises of ball bearing and fog have been measured for angular contact type ball bearing of 40 mm bore with bakelite cage under the supply of spindle oil. The conclusions obtained from the experimental results are as follows. The fog lubrication widely reduces the hydrodynamic friction losses of the ball bearing as it may be lubricated with oil of minimum requirement securely and continuously. Though the higher rotational speed requires the more quantity of oil, about 3 cc/h of oil supply is sufficine at a dn-value of 800 000 in this case. The cooling effect of air is somewhat remarkable, but the effect of air for the temperature rise of bearing is less than the influence of oil under definite ratio of oil to air. Though the temperature rise and friction moment increase proportionally to the amount of preload under fog lubrication, when oil is supplied sufficiently, the increase of preload does not so much influence upon the temperature and friction. In the comparison with ordinary lubrications, the bearing temperature rise and coefficient of friction under fog lubrication are much smaller than that under oil lubrication, and the differences between fog and oil lubrications become larger according to the increase of rotating speed.

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