The internal friction torque measurements in Cylindrical Roller Thrust Bearings (RTB) lubricated with axle gear oils under boundary film conditions were performed using an axial rolling bearing test rig generating tribofilms. The X-ray photoelectron spectroscopy (XPS) was used to characterize the tribofilms formed on the bearing rollers and raceways. After the tests, wear debris were found on the oil samples which lubricated the surface of the roller bearing raceways for that surface topography measurements and oil analysis (ferrography) were mandatory to measure and to visualize the occurring wear. The results obtained indicate that axle gear oil formulations and their additive packages have got a significant influence in controlling roller bearing friction and wear under boundary film lubrication.

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xray photoelectron spectroscopy xps boundary film lubrication axle gear oil formulations wear debris oil analysis roller bearing friction and wear tribofilms surface topography measurements roller thrust bearings rolling bearing test rig internal friction torque measurements

Jorge Seabra, Ramiro Martins, Nuno Rodrigues, Mohamed Haddar,Maroua Hammami, Carlos Fernandes, Mohamed Slim Abbes,.Axle gear oils: Friction, wear and tribofilm generation under boundary lubrication regime. 114 (0),.

Jorge Seabra, et al."Axle gear oils: Friction, wear and tribofilm generation under boundary lubrication regime" 114

Jorge Seabra, Ramiro Martins, Nuno Rodrigues, Mohamed Haddar,Maroua Hammami, Carlos Fernandes, Mohamed Slim Abbes,"Axle gear oils: Friction, wear and tribofilm generation under boundary lubrication regime"