Difference in Preventive Mechanism for Fretting Wear between Oil and Grease Lubrication

摘要

Influence of lubricant viscosity on fretting wear was different between oil and grease lubrication. In the case of oil lubrication, fretting wear was reduced due to high viscosity at A/D ＞ 1.5 because the oil film could be formed. On the other hand, in the case of grease lubrication, it was reduced due to low viscosity at A/D ＞ 1.0 because the thickener film could be formed. Moreover, it was shown that the thickener film acted like a liquid within contact area because fretting wear increased at low viscosity and low velocity regardless of the thickener film formation around contact area.