PROCEDURE DETERMINING LUBRICATING POWER OF OILS Russian patent published in 2002 - IPC

FIELD: evaluation of quality of liquid lubricating materials. SUBSTANCE: procedure determining lubricating power of oils consists in working of friction pair in presence of lubricant, in transmission of electric current through it, in removal of static voltage from surfaces of friction pair by change of polarity of electric current, in measurement of constant current when friction pair is immobile under steady-state friction mode in presence of lubricant in contact. Value of current in the course of period from start of test to stabilization of its value under steady-state friction mode depending on friction time, load, sliding velocity, mechanical properties of material of friction pair and temperature of oil is measured. Their graphical dependencies are constructed and lubricating power of oil is evaluated by following parameters: adaptability, rate of adaptability of oil to given friction conditions and coefficient of oil compatibility. Adaptability of oil is found by time period from start of fall of current to its stabilization, rate of adaptability is determined by slope of graphical dependencies with respect to axis of ordinates and coefficient K_C of oil compatibility is determined by formula where I_З is specified value of current transmitted through friction pair under steady-state mode; I_C is value of constant current when it is stabilized in process of friction. EFFECT: raised authenticity of evaluation of lubricating power of oils. 7 dwg