Influence of Lubricants on the Durability of Tribocouples

The aim of the research is to determine the influence of motor oils on operating modes, durability of tribocouples and substantiation of expediency of use of motor oils of corresponding brands. A study of the tribological properties of motor oils from different manufacturers. Characteristic features of friction moment change during lubrication with ZIC and Xado oils have been studied. During friction in the ZIC oil environment, significant oppositely directed changes in the moment of friction (oscillation) were recorded, which indicates an unstable friction mode. At the beginning of the experiment, a gradual increase in the friction moment when lubricating tribocouples with Xado oil was recorded. Studies of the dynamics of temperature in the friction zone depending on the lubricating medium are performed. It was found that the maximum temperature in the friction zone was when using Xado and ZIC engine oil - 90.0 ºC and 84.5 ºC, respectively. The value of wear intensity of steel-steel tripods depending on the engine oil of different manufacturers is determined. An analysis of micrographs of surfaces before and after the experiment was performed. It is established that the amount of damage to the surface friction as a whole without drastic changes. Unidirectional light lines are the places of direct contact between two friction bodies. After the experiment with lubrication with Xado engine oil on the friction surface of the pad recorded minor accumulations in the grooves and on their peripheries. It was found that the moment of friction when using the selected motor oils for the selected modes of friction of the tribocouples differs slightly, 1.13 N ∙ m and 1.15 N ∙ m, respectively, for ZIC X5 and Xado. At the same time, it should be noted that when lubricating with Xado engine oil, a higher constancy of the friction moment was recorded, compared to working in ZIC oil environment. It is established that the dynamics of temperature rise is gradual. The intensity of linear wear when using Xado oil is 17.7% lower compared to lubrication with ZIC oil. Thus, it can be concluded that the use of Xado motor oil can increase the durability of tribocouples.