METHOD FOR DETERMINING COEFFICIENT OF FRICTION OF LUBRICANTS Russian patent published in 2023 - IPC G01N19/02 

FIELD: mechanical engineering.

SUBSTANCE: invention is related to methods for studying the coefficient of friction of lubricants of various compositions. A method for determining the coefficient of friction of lubricants is disclosed, including fixing a movable shaft in a lathe chuck, on which a guide bushing, a conical guide bushing is installed. A linear bearing is installed in the hole of the tapered conical bushing, as well as a counterbody in the form of a conical bushing, which is in contact with the indenter. At the same time, an induction furnace is installed to heat the contact zone of metal vapors, located on a conical guide bushing and isolated from the external environment by means of a conical heat-insulating bushing fixed with a fixing ring. In order to control the heating of the contact zone of metal pairs, a thermocouple is used, formed by chromel-kopel electric wires, the junction of which is placed in the indenter hole, the signal of which is fed through current collectors to an analog-to-digital converter and then to a personal computer, with which the temperature is recorded in the process of friction. The torque generated during the operation of the friction pairs is recorded using an electronic dynamometer in contact with the holder, connected to the conical guide bushing. At the same time, a crucible is used to accommodate a lubricating process medium (LPM), in which the STS is mixed with a compressed gas, where the formed gas-oil mixture is fed into the contact zone. To control the pressure of the compressed gas in the crucible, the pressure of the liquid in the channel for supplying the LPM and the flow rate of the liquid, sensors are used that are connected by electrical wires to the control unit. At the same time, the temperature of the gas supplied to the crucible for placing the LPM is maintained in the required range using a gas heater and a Ranque-Hilsch vortex tube designed to cool the gas. Also, in the process of LPM bubbling, gas is ionized. The aforementioned sensors are controlled by a personal computer comprising the Arduino software.

EFFECT: expanded range of equipment to improve the accuracy of determining the coefficient of friction of lubricants by measuring the temperature in the friction zone of metal pairs.

1 cl, 4 dwg