Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
INFLUENCE OF LUBRICATING OIL VISCOSITY AND CHEMICAL PROPERTIES IN THE VIBRATION LEVEL OF AN INTERNAL COMBUSTION ENGINE
Submission Author:
Claudio Santana , MG , Brazil
Co-Authors:
Claudio Santana, Jose Eduardo Mautone Barros, Helder Alves de Almeida Junior
Presenter: Claudio Santana
doi://10.26678/ABCM.COBEM2021.COB2021-0011
Abstract
In the automobile industry, the production technology of lubricating oils follows the technological evolution of internal combustion engines. The new technologies incorporated in the production of automotive oils ensures greater cleaning of the engine, greater protection against wear, better performance with less fuel consumption, helps to reduce the vehicle emission in addition to ensuring a longer oil change interval. The objective of this study is to investigated the vibrational behavior of a modern internal combustion engine in function of fuel and the type of technologies incorporated into automotive oils. The study consisted of instrumenting the engine at specific points with accelerometers to measure the vibration level intensity of the engine during the experiment and operating the engine on a bench dynamometer in a test cycle with a specific fuel (ethanol or gasoline) and specific oil (mineral, semi-synthetic or synthetic). Each experiment lasted 600 hours of testing and every 50 hours an engine vibration level were measured and 100ml sample of lubricating oil was collected for chemical analysis of the lubricant's properties. The results show that the vibration level of the engine increases with the time of use of the lubricating oil and that this increase is very significant when the oil viscosity reaches the minimum value stipulated by the manufacturer. Semi-synthetic and synthetic lubricating oils have similar engine protection characteristics, but synthetic oil protects the engine for a longer period of time due to less degradation of chemical properties compared to semi-synthetic. Mineral lubricating oil presented protection for a very short test period, due to the rapid degradation of chemical properties and measurements showed an average increase of 20% of vibration engine running with mineral lubricating oil in relation synthetic and semi-synthetic oils. This research is important because it correlates the degradation of the lubricating oil with the engine vibration level and vibration problems in internal combustion engines produce premature wear on the internal components of the engine, which contributes to reduce the lifespan of the engine. This study also shows how is important to observe the correct application of automotive oils.
Keywords
Internal combustion engine, Engine vibration, mineral oil, semi-synthetic oil, synthetic oil
