Evaluation of Property Difference between Traction Oil and Traction Grease

Abstract

In this paper, the characteristics of traction grease are evaluated. The difference in film formation ability between traction oil and traction grease is focused on, and the state of film formation and the traction coefficient of traction oil and two types of traction grease with different consistencies are measured simultaneously while varying temperature, Hertzian pressure and rolling speed. The traction coefficient of traction grease at a low temperature, a low pressure and a high peripheral speed shows a value larger than that of traction oil. The film thickness of traction grease is measured by the contact ratio method and decreases markedly at a low temperature and a high peripheral speed compared with that of traction oil. An estimation formula for traction grease considering film thickness is developed. These results lead to the conclusion that the property change between traction oil and traction grease is caused by the change of the film formation state.

Investigation of friction characteristics of control cables

“…Commonly used grease lubricants. The effects of different types of lubricants were investigated in previous studies [5]. These studies show that liquid type lubricants have a lower maximum traction coefficient than grease lubricants.…”

Film Thickness and Friction Relationship in Grease Lubricated Rough Contacts

“…Once again, it is frequent to describe the grease behaviour based on the properties of the base oil. Still, a few authors claim that this assumption leads to wrong predictions [10,12,13,[23][24][25], since the properties of the active lubricant at the contact inlet might be considerable different from those of the original base oil that the grease was formulated with (due to thickener, additives, etc.). Therefore, it is very hard to predict the correct lubrication regime, if the active lubricant is unknown.…”