Monitoring of the temperature parameters of the lubricant performance using thermostating procedure

Abstract

Modern methods for classifying motor oils by viscosity classes and groups of the performance properties are characterized by the lack of information about the temperature range of the oil working capacity and tendency to aging due to the design features of internal combustion engines, operating modes and conditions, the degree of forcing and technical condition. One of the main goals of improving the technical and operational indicators of the designed and operated equipment is the selection of appropriate lubricants, the proper choice of optimal modes of operation and lubrication. We present the results of studying the effect of temperature on the performance of lubricants, review and analyze methods for their control. The temperature parameters of the working capacity of lubricants are determined by the method of thermostating. A photometric device for direct photometry of oxidized oils and electronic weighing machine were used as measuring instruments. The optical density and evaporation coefficient of the lubricant were estimated proceeding from the results of testing a sample of partially synthetic motor oil. The temperature and time dependences of the optical density, oxidation resistance coefficient, volatility, thermal oxidation stability coefficient, and temperature limits for the test specimen were determined, including the temperatures of the onset of oxidation, evaporation and temperature transformations, critical temperatures of the processes considered and potential in-service life. The proposed method provides the ability to compare various lubricants of the same duty by the temperature parameters and determine the temperature range of their efficient use in mechanical systems.