METHOD OF DETERMINING THERMAL RESISTANCE OF LUBRICATING OIL Russian patent published in 2016 - IPC G01N33/30 

FIELD: machine building.

SUBSTANCE: invention relates to testing lubricating oil. Method comprises sampling oil, dividing said sample into equal parts, each of which is heated at atmospheric pressure with condensation of vapour and removing condensate, wherein for every next part of oil sample test temperature is increased by a constant value, after which light flux absorption coefficient is determined, kinematic viscosity of temperature-controlled oil sample is also determined at temperature 40 and 100 °C, viscosity index, plotting graphic dependence of viscosity index from testing temperature and light flux absorption coefficient, based on value of change in viscosity index of light flux absorption coefficient, determining effect of concentration of thermal decomposition products on viscosity index, and temperature stability is determined by value of change in viscosity index test depending on temperature and concentration of thermal decomposition products, wherein less change in viscosity index, higher temperature resistance of tested oil.

EFFECT: higher efficiency of determination.

1 cl, 2 dwg, 1 ex, 1 tbl