研究業績

Various studies have been already reported on the effects of oiliness additives (e.g., stearic acid) on tribological performances. However, it has not been clarified the breakdown processes of their boundary films in EHD contacts of practical bearings. In the previous studies, the authors have developed the electrical impedance method which simultaneously measures the thickness and breakdown ratio of oil films in EHD contacts. Besides, it has been confirmed that the method measures the oil film thickness with high accuracy comparable to the optical interferometry, which is applicable to practical bearings. In the present study, the effects of oiliness additives on lubrication condition in rolling bearings have been investigated by the electrical impedance method, especially to clarify the breakdown processes.