Experimental Analysis of Chemically Degraded Lubricant’s Impact on Spur Gear Wear

Abstract

The impact of lubricating oil degradation, which can happen during both storage and use, on spur gear wear is thoroughly examined in this paper at all scales, from macro to nano. A thorough structure was created by combining the results of testing performed at the macroscale on a test rig and at the nanoscale using tools such as FESEM analysis. Using a single-stage spur transmission under two different working conditions ('40Nm, 1200rpm, 198 hours' and '50Nm, 500rpm, 90 minutes'), macroscale experiments were carried out using both conventional and artificially degraded lubricant oils. Aqueous hydrochloric acid (36.46% v/v concentration) was added to the lubricating lubricant to induce artificial degradation. Wear development and oil degradation were monitored in real time using tools such as metallic wear detritus sensors and oil sensor suites. Offline methods, such as total acid number (TAN) and pH value readings, were used with periodic lubricant oil samples. It was discovered through both online and offline monitoring methods that the spur gear experienced substantial wear in lubricant-degraded conditions. By demonstrating elevated levels of oxidative degradation products and the formation of new oxidative compounds, such as sulphates and aromatic groups, the attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) analysis of the oil degradation at the nanoscale verified this. In addition, water creation was noted. It is interesting to note that the pH meter has become a viable option for detecting oil degradation and offers a useful way to keep track of lubricant quality. Overall, this study shows that there is a strong connection between macroscale and nanoscale phenomena in the complete method created for assessing the tribological performance of gear lubricants.

Limitary State of Heavy-Duty Engine Oils and Their Evaluation According to the Change of Tribological Properties during Operation

“…This dependence shows the importance of acidity changes for heavily loaded friction pairs. A considerable number of studies shows the direct correlation between oil deterioration and the reducing tribological efficiency of lubricants [26][27][28]. The aging of lubricants causes the change in the lubricants' chemistry and the compounds formed at the friction A considerable number of studies shows the direct correlation between oil deterioration and the reducing tribological efficiency of lubricants [26][27][28].…”

“…A considerable number of studies shows the direct correlation between oil deterioration and the reducing tribological efficiency of lubricants [26][27][28]. The aging of lubricants causes the change in the lubricants' chemistry and the compounds formed at the friction A considerable number of studies shows the direct correlation between oil deterioration and the reducing tribological efficiency of lubricants [26][27][28]. The aging of lubricants causes the change in the lubricants' chemistry and the compounds formed at the friction surface [29].…”

A Comparative Analysis of the Lubricating Performance of an Eco-Friendly Lubricant vs Mineral Oil in a Metallic System

“…To deal with this problem, some companies recondition the lubricants to give them a "new use", but they basically separate the wear debris particles and incorporate some additives without any standard parameter about this process. Likewise, recent investigations are focused on studying the effect of degradation on lubricating performance [5] and finding different ways to reuse degraded lubricants [6]. The interesting results of [5,6] have demonstrated that by the incorporation of nano-additives, the acidification, pH value, and wear responses can be improved.…”

“…Likewise, recent investigations are focused on studying the effect of degradation on lubricating performance [5] and finding different ways to reuse degraded lubricants [6]. The interesting results of [5,6] have demonstrated that by the incorporation of nano-additives, the acidification, pH value, and wear responses can be improved.…”

Study on the Dynamic Characteristics of Gears Considering Surface Topography in a Mixed Lubrication State

“…Chang et al [6] have researched the lubrication of tooth surfaces with groove textures to reduce friction. In recent years, research on gear lubrication has further expanded to encompass thermal elastohydrodynamic lubrication [7,8] and the study of lubricants [9,10]. Sivayogan et al [11] have further studied the transient non-Newtonian elastohydrodynamics of rough meshing tooth surfaces under complex contact kinematics.…”