Process features and parametric assessment of the emergence of the excessive wear for the brake pads of freight car bogies

Abstract

The article presents a new scientific approach to the problem related to the specific nature of the adverse biplanar critical friction wear profile of brake pads which is quite common in cars of Ukrzaliznytsya JSC, as well as in many countries where the so-called three-element bogies are used. In order to study the dual wear of brake pads during the operation, the statistical material was collected and processed in the specialized software STATISTIKA to obtain graphical dependences that confirm the results of theoretical research. In the conducted studies, the concept of dual friction wear of brake pads was first discovered as a phenomenon and introduced. The stages of formation of especially harmful wear on the working surfaces of brake pads causing the complex formation of adverse specific dual wear are shown. A new concept of the duality coefficient of frictional wear of brake pads has been introduced, and a formula for its calculations has been proposed, which has been tested in the calculations of the values of brake pressures of pads with dual wear to support the analytical studies.