Calculation and experimental assessment of tribological parameters of shoe brakes

The performance characteristics of shoe brakes are, to a large extent, determined by the coefficient of friction realized in the sliding contact of the brake shoe and disk. The value of the friction coefficient is influenced by the combination of a number of factors ? physical and mechanical characteristics of contacting surfaces, sliding speed, temperature, value and character of distribution of loading. In this regard, the friction coefficient is a probabilistic value, and its theoretical determination requires experimental confirmation. The paper presents theoretical and experimental results of determining the friction coefficient depending on the degree of running-in of the contacting surfaces and the law of pressure distribution. Experimental studies were carried out on a setup simulating the contact of the working surfaces of the brake disk and the shoe during operation of a single-block brake. It has been established that an increase in the angle of contact between the brake shoe and the disk leads to an increase in the value of the reduced friction coefficient of 1.14...1.26. To increase the value of the reduced friction coefficient, it is proposed to ensure a displacement of the contact zone of the brake shoe and disk by a certain angle. It is shown that the theoretical values of the reduced friction coefficient are within the limits of the confidence interval obtained experimentally.
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