Study of lubricating properties of oils on a friction machine
The work is devoted to establishing the dependence of the quality of lubrication of a rubbing surface on time using the example of a friction pair bearing - crankshaft journal The following tasks were set during the study: 1. to draw graphs of torque versus time, guided by the data obtained; 2. to determine, after analyzing the results, which of the oils presented lasts longer on the friction surface, and therefore removes heat from the surface with the highest quality, protecting it from dry friction, overheating and premature wear; 3. to suggest ways to improve the quality of oils by studying the dependence of lubricating capacity on the composition of the oil. To perform the tasks, such methods as determining the lubricating properties of motor oils by droplet formation and studying the lubricating properties of motor oils on a friction machine were used. Both in studies of oils in terms of drop formation, and when testing oils on a friction machine, the highest performance was demonstrated by the following motor oils: Motor Oil OOO Prodtekh (10w-30); Motul 8100 Eco-Lite (5w-30); Castrol Magnatec (5w-30). Oils Mobil Super 3000 (5w-30), Shell Helix Hx7 (5w-30) at the first stage of research showed a small contact angle, but when studying the lubricating properties on a friction machine, these samples showed a rapid increase in the resistance to rotation. Oils "Gazpromneft Super (10w-40)" and "Lukoil Standard (10w-40)" showed the worst results both in the study of drop formation and in the study of lubricating properties on a friction machine.