ВПЛИВ ТЕМПЕРАТУРИ НАВКОЛИШНЬОГО СЕРЕДОВИЩА НА ВЛАСТИВОСТІ МОТОРНИХ ОЛИВ

Abstract

The article presents the results of studies that were conducted on the SMC-2 tribometer according to the ring-sleeve scheme in conditions of non-shocking sliding friction due to the rotational motion of the roller. In order to perform experimental studies of the processes of friction and wear of metal vapors and to study mechanical-physicochemical processes in the interaction of a steel-steel pair, in our experiment we studied motor all-season oils of different chemical composition on the rheological basis: motor oils of semisynthetic origin TEMOL 10 synthetic origin and TEMOL Premium synthetic origin origin of TEMOL Premium 5W-40. The aforementioned oils were tested for 15 min under conditions of temperature rise from minus 180C to plus 750C. The purpose of the work is to minimize the friction processes in the conditions of forced increase of the volume temperature of engine oil in engines of type D-241 and engine of concern Volkswagen VAG ASV 1.9 TDI. The method of investigation is the experimental determination of the rheological features of motor oils and the antifriction properties of friction pairs. According to the results of experimental studies, it is established that the stability of the formation of film thickness with increasing temperature, starting from low temperatures, gives synthetic oils some advantages at low-temperature starting, that is, to the conditions of realization of mixed friction (lubrication starvation). Semi-synthetic oil has some advantages in the formation of the thickness of the lubricating layer under conditions of liquid friction at moderate temperatures, which is explained by the formation of a thickness of greater magnitude, has better viscoelastic properties in these conditions of fluid friction. It is established that oils of semisynthetic and synthetic origin have excellent antifriction properties and this can be explained by their stable to mechanical degradation properties in the conditions of accelerated warming of the internal combustion engine. KEYWORDS: ENGINE OIL, RHEOLOGICAL CHARACTERISTICS, ANTIFRICTION PROPERTIES, FILM THICKNESS.