METHOD OF DETERMINING QUALITY OF LUBRICATING OIL Russian patent published in 2012 - IPC G01N3/56 G01N33/30 

FIELD: physics.

SUBSTANCE: lubricated friction pair is tested and quality of oil is determined. An oil sample is heated at constant temperature with agitation of the constant mass. At equal intervals, a portion of the oxidised oil sample is collected, light flux absorption coefficient is determined by photometering, the sample is tested for antiwear properties, the wear scar diameter and the coefficient of antiwear properties are determined using a formula. A curve of the coefficient of antiwear properties versus the light flux absorption coefficient is plotted and the quality of the lubricating oil is determined from the slope of the curve relative the abscissa. The higher the slope, the better the antiwear properties of the lubricating oil and its quality.

EFFECT: high information content of the method of determining quality of lubricating oil by taking into account parameters of thermal oxidative stability and antiwear properties and monitoring quality of lubricating oil.

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