Abstract
The conditions of friction and lubrication of sliding bearings in a marine diesel engine are considered. In conditions of transient conditions, heavy loads or contamination of the lubricant used in bearings of marine diesel engines, the lubricating film becomes quite thin with a thickness in the range of 0.25-2.5 microns, and the local pressure is large enough – about 15-20 MPa. At the same time, for the operation of sliding bearings in hydrodynamic mode, the minimum pressure in the lubrication system is P = 0.05 MPa, otherwise, a zone of boundary friction is formed between the neck of the crankshaft and the liner through the hydrodynamic wedge. A method is proposed to improve the tribotechnical properties of lubricants in sliding friction pairs by using a patented anti-wear additive based on molybdenum diselenide MoSe2 and fatty acids. An assessment of the tribotechnical characteristics of modified lubricants using the anti-wear additive Nanotex-12 was carried out under conditions simulating the operation of a real crankshaft bearing of a marine diesel engine 6ChNSP 18/22 on a friction machine 2070 SMT-1. The variables of the wear conditions of the parts of the simulated sliding bearing were the pressure at the contact of the rubbing surfaces and the concentration of the anti-wear additive (by volume) in the lubricating oil M-16G2CS. As a result of computational and experimental studies, graphical dependences of wear, wear intensity and wear resistance of the simulated friction unit on the volume concentration Ci of the anti-wear additive in the lubricating oil and the contact pressure Pi were obtained. It has been confirmed that the use of additives in M-16G2CS lubricating oil significantly improves its tribotechnical characteristics, since the wear of the friction pair decreases by 5-15%, the wear intensity decreases by 7-17%, and the wear resistance increases by 6-18%, depending on the concentration of the additive in the lubricant. Reducing wear on the sliding bearing in the case of using an anti-wear additive (compared with non-shrink lubricating oil) creates grounds for its successful use in marine oils, but increasing the concentration of the additive in oil over 2.0% by volume is impractical due to the deterioration of tribotechnical characteristics and a decrease in the economic efficiency of such lubricating compositions.
Published Version
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