DEPENDENCE OF FRICTION MOMENT ON LOAD WHEN TESTING ENGINE OIL 5W30 USING THE FOUR-BALLS METHOD

Abstract

In modern cars, there are many moving parts, among which direct surface contact is inevitable. This contact leads to friction, which reduces the lifespan of the parts. To reduce this factor, oil is used, which covers the surface with a protective film and prevents the surfaces from wearing out quickly and intensely in the tribological process. The magnitude of friction depends on the applied load. The study conducts tribological tests to examine how different load sizes affect the friction moment and how the properties of oils influence friction processes under various operating conditions. Experiments conducted during the study showed that an increase in load leads to a rise in the friction moment by up to 105%, but modifying the oil composition does not always yield positive results. When the load is increased, the oil additive that improves lubricating properties does not enhance the oil's performance and does not reduce friction between the parts.