FIELD: machine building.
SUBSTANCE: oil fixed-mass sample is heated at selected temperature and barometric pressure for constant time, tested at friction machine and wear spot is measured. In compliance with this invention, sample of thermostatted oil at every selected temperature is tested at friction machine at three loads. Wear spot diametre is measured at every load to plot wear spot diametre vs. thermostatting temperature curve. Temperature areas with minimum and maximum stable wear spot diametres are defined while oil lubricity is defined from temperatures of temperature area limits on wear spot diametre vs. load curve.
EFFECT: comprehensive determination.
1 ex, 4 dwg
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