| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2012: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
The temperature and thickness of oil film in point EHL contacts between a rough stationary steel ball surface and a smooth moving sapphire disc surface are measured with infrared and optical interferometry techniques. When the single ridge is aligned perpendicular to entrainment direction, the maximum temperature rise occurs at the ridge in the case of ridge at the exit of contact. There is almost no difference in the maximum oil film temperature rise between the longitudinal and transverse multiple ridges.
The central film thickness of entrapped oil is depending on the loading speed but independent of the final load value. When impact is applied to the surface with long ridges, the horse-shoe shaped constriction is formed at each bump near the contact rim, and the micro-groove is produced in the ridges.
The average film thickness for grease is larger than that for the base oil. It seems that thickener size has effect on the average central film thickness at low speed.
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