The National Transport University Bulletin

Abstract

The article is devoted to the proposed modern scientific and applied approach to the comprehensive assessment of lubricants and the introduction of a new concept of comprehensive tests to improve the efficiency of lubrication and wear resistance of friction pairs, which maximally approximate the conditions of qualification (experimental) studies to the real friction conditions of vehicle components in operation. This is achieved by choosing an effective concept for conducting comprehensive experimental (qualification) tests, using the necessary modern and automated equipment, applying modern methods of mathematical processing of research results and implementing the results of experimental studies during bench and operational (field) tests on original equipment and machines at enterprises producing lubricants and operators of friction units. The means of implementing complex tests that consider: non-stationary friction conditions, the shape of the actual contact and friction kinematics, rheological properties of lubricating (modified) layers, local temperature in the friction contact zone, physical and chemical composition of components in the lubricant in terms of contact-mechanical, rheological and physical and chemical aspects are determined. Thus, the general concept of comprehensive testing of lubricants to improve the lubrication efficiency and wear resistance of conformal and non-conformal units (friction bearing units and internal combustion engine units) operating under extreme operating conditions is presented, covering the full life cycle of the lubricant medium from the manufacture of mixtures, to the development and implementation of modified oils and to the final service life of used oil at operating enterprises. Relevant results of bench or operational tests, if they did not show the expected positive results, make it possible to adjust the input physical and chemical parameters of lubricants in accordance with the proposed concept scheme and achieve positive results of operational tests

Keywords:

extreme friction conditions; lubricant; bearing friction unit; internal combustion engine (ice) units; non-conformal friction units; conformal friction units; microelastohydrodynamic (micro-egd) lubrication; lubricating (modified) layer; chemical active substances (cas); stress-strain state of contact friction surfaces; rheological properties of lubricants; qualitative and quantitative physical and chemical composition of lubricants; frictional contact