点接触EHLにおける気体性キャビテーションの成長に及ぼす雰囲気温度の影響

抄録

This paper describes the effect of surrounding temperature on the behavior of cavitation formed in lubrication film. Point contact sliding tests were conducted in the vacuum chamber in which surrounding temperature and gas were controlled. Temperatures used in this study were in the range between 295 K and 350 K, and gases used were helium, argon, carbon dioxide and air. Two stage cavity growths, i.e. initial stage and second stage as reported in previous report, was found at elevated temperature. Although cavity length was not changed by temperature at initial time after its generation, the cavity length at higher temperature was longer than that at lower temperature in the second stage. Cavity growth in the second stage is affected by gas solubility; cavity length in temperature with higher gas solubility is longer. These results suggest that cavity growth in initial stage is related with rapid evolution of negative pressure at outlet of conjunction and that in second stage is related with gradual release of dissolved gas into cavity.