Determination of the reduced coefficient of friction in the hinge joints of machines

Hinged joints are critical components of machine drives, and their insufficient load-bearing capacity and durability can be the main factor limiting the overall performance of the drives. The value of the reduced friction coefficient is one of the main parameters influencing the tribotechnical and operational characteristics of hinged joints — wear resistance, durability, load capacity, etc. The paper presents theoretical and experimental results of determining the friction coefficient depending on the characteristics of the mating surfaces of cylindrical hinges: degree of running-in; pressure distribution law; contact zone angle. It has been shown that increasing the contact angle of mating surfaces from 40 to 160° causes an increase in the reduced coefficient of friction by 20...40%. Experimental studies were carried out on a setup that simulated the friction process in the mating surfaces of a hinge under conditions of their relative sliding. The results of the experiment confirmed the adequacy of the obtained theoretical dependencies and showed that with an increase in load, the friction coefficient changes by no more than 14,8 percent.
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