Observation of Trapped Thin Oil Film Behavior between Ball and Disc with Using Ultrasonic Technique
Observation of the behavior of trapped oil film in Hertz contact region such as a ball and disc becomes an important theme even though the diameter of the trapped area is narrow with less than 0.5mm and the thickness is extremely thin with several hundred nanometers, because the contact between metals is avoided by this thin film and the safe driving can be secured. In this study, the measurement of oil film thickness and the observation of trapped oil film were carried out with using ultrasonic technique. The amplitude of the reflection wave from the boundary depends on the conditions of formation of trapped oil film as the ultrasonic wave emitted to the interface formed by a ball and a disc does multiple reflections in oil film. As a result of the measurement of oil film thickness with using an ultrasonic technique, it became clear that ultrasonic technique can measure the film thickness of about 50nm in the case of standstill surface with extremely small surface roughness. Furthermore, the potential that grasp the difference of the trapped conditions and the time change of formation conditions (oil film thickness) about some kinds of oil was able to clarify for bearing steel used in a normal ball bearing.
Ultrasonic technique Ball bearing Bearing steel Trapped oil film Nanometers scale
Kochi University of Technology, Tosayamada-Chou, K Seiichi TERADA, So TODA
Automax Co. Ltd., 4-28-13 Azusawa, Itabashi-ku, Tokyo, 174-0051, Japan
国际会议
第十七届世界无损检测会议(17th World Conference on Nondestructive Testing)
上海
英文
1070-1075
2008-10-25（万方平台首次上网日期，不代表论文的发表时间）