潤滑油の高圧物性と衝撃弾性流体潤滑に関する研究

抄録

Using an engine oil adding soft matter and a rice bran oil refined from rice bran, high pressure density and high pressure viscosity tests have been carried out, and high pressure physical properties of the test oils have been obtained. As a result, it was found that the engine oil M16A adding soft matter with molecular aggregation property shows the almost same pressure viscosity coefficient as PAO40 with high viscosity. The same tendency between the rice bran oil and a comparative mineral oil with close viscosity grade to the rice bran oil was confirmed. In addition, entrapped EHL oil film formation and its variations over time under impact loading condition have been examined. In both of M16A and PAO40, decreasing process of the entrapped EHL oil films caused by liquid behavior of the oil film was observed, and the oil film of M16A disappeared quickly compared with PAO40 having large lubrication parameter αη₀. In the case of the rice bran oil, the entrapped oil film with thickness of about 70 nm remained till 90 second from the impact loading, and so the influence of unsaturated fatty acid constituting the rice bran oil was suggested.