Abstract
Development of technical maintenance of transport means consists in providing their technical state at a significant level of functional operability for which the use of quality lubricants is a key requirement. Therefore, determination of technical state of truck transmission oils by the method of thermal-oxidative stability during their operation is an urgent problem.This problem was solved and technical state of the transmission oil was studied on the basis of operational tasks and the results of their chemotologic studies. These results can be used in development of a system of vehicle maintenance and when substantiating feasibility of using concrete oil grades during operation. A procedure for studying, determining state and compliance of the working oils by their thermal-oxidative stability with operating conditions during vehicle operation has been developed. State of transmission oils was studied during vehicle operation in gearboxes of KamAZ 6520 and MAN TGA 6×4 trucks. The study of working transmission oils was conducted at following parameters: light transmission, evaporability, viscosity. The results of studies of light transmission through an oil sample and evaporability after application of the temperature regimes used in testing working oils were used in graphical and analytical representation of the coefficient of thermal-oxidative stability. Variation of the coefficient of thermal-oxidative stability of oils of respective grades depending on their relative viscosity was determined. Analysis of the obtained functions will enable development of recommendations on conformity of working oils to the conditions of their operation.It was found that the Tedex Gear GL-4 80W90 transmission oil, used in MAN TGA 6×4 trucks, corresponds by its thermal-oxidative stability characteristics to the operating conditions. At the same time, the study of use of YUKO TО-4 80W-85 transmission oil in KamAZ 6520 trucks has shown that the oil did not demonstrate its functional capacity at runs of 8‒30 and 45 thousand kilometers. This was confirmed by analysis of the mathematical model of variation of thermal-oxidative stability of oils depending on relative viscosity, namely, by overshoot of some numerical values of the function beyond the level of 0.85 un. for the vehicle runs under study.It was established that the study data can be applied to substantiation of further operation and selection of transmission oils for the studied vehicle models in transportation activities of the enterprise
Highlights
Reliability of transport vehicles is determined by the processes occurring in tribological systems of “materials of mating parts – oil” type
Experimental studies have established variation of thermal-oxidative stability depending of the vehicle run using results of studies of the coefficients of light transmission, evaporability, and relative viscosity
The corresponding regression equations of variation of the coefficient of thermal-oxidative stability depending on the vehicle run and the ratio of relative viscosity of YUKO TО-4 80W-85 and Tedex Gear GL-4 80W90 transmission oils during operation of KamAZ 6520 and MAN TGA 6×4 trucks were obtained
Summary
I. Rohovskii PhD, Senior Researcher Research Institute of Engineering and Technology National University of Life and Environmental Sciences of Ukraine Heroiv Oborony str., 15, Kyiv, Ukraine, 03041. Doctor of Technical Sciences, Associate Professor Department of Logistics and Traffic Safety. Volodymyr Dahl East Ukrainian National University Tsentralnyi ave., 59-а, Severodonetsk, Ukraine, 93400 *Department of Maintenance and Repair of Machines**. **Central Ukrainian National Technical University Universytetskyi ave., 8, Kropyvnytskyi, Ukraine, 25006
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