The National Transport University Bulletin

Abstract

The article is devoted to the determination of volumetric wear and friction coefficient depending on the vehicle mileage. For a comprehensive increase in the tribological properties of lubricants, friction modifiers are used to improve the antiwear and antifriction properties of lubricants. It is proposed to consider the methodology of special tribotechnical studies on the CSM Instruments SA (Switzerland). According to the proposed method, the best antiwear and antifriction properties of special ashless ZnFree tribopackages for lubricating diesel engines of the EURO 6 class. The results of the study are important, since organic compounds based on sulfides and phosphides exhibit the best antiwear properties both at t = 20°C and at local heating of the oil to 70°C, despite the fact that these additives contain a minimum amount of phosphorus and sulfur, which do not contain metal-containing compounds and, therefore, can be recommended for lubricating units of the cylinder-piston group (CPG) of internal combustion engines (ICE) that meet EURO6 requirements. These engines are equipped with an EGR system, selective SCR catalysts and particulate filters, so the results of improved anti-wear properties are important for the creation of LowSaps type engine oils. It has been determined that the main factor in stabilizing the friction coefficient for all samples during local heating of the oil to 70°C (operating temperature of heavily loaded transmissions) throughout the entire run time is the creation of an optimal elastohydrodynamic film under such conditions, which positively affects the antifriction properties. The established preferred sweat-seeking and anti-friction properties of a sample containing sulfide-phosphide compounds and not containing organometallic compounds (zinc) make it possible to develop special LowSAPS engine oils for EURO 6 engines with the best tribotechnical characteristics, which are equipped with such systems, using the proposed method. Thus, to prevent polishing of the honing mesh of the inner wall of the sleeve of the working cylinder of the internal combustion engine and contamination of the neutralization systems with ash deposits.

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