Increasing the resource of traction gears of rolling stock of railways based on their optimization design

Abstract

The article is devoted to solving the urgent scientific and technical problem of increasing the traction gear (TG) resource of rolling stock on the basis of their optimization design.
The results of the analysis of recent studies to ensure the reliability of TG revealed that one of the promising areas is to improve their design according to the results of their optimization design. The main purpose of this TG design is to find the appropriate design parameters under which the best conditions of interaction of the contacting prongs of the gear wheels and wheels, the characteristics and indicators of engagement, the expected transmission
resource.
A mathematical record of the TG optimization design problem is presented in the form of minimization of the corresponding objective function, which describes the relationship between the selected criterion (the difference between the maximum coefficients of sliding on the gear teeth legs λ_1max and the wheel λ_2max - Δλ) and selected as independent variables, the displacement coefficients x₁ and wheels x₂. To solve it, we propose the use of locking circuits
(LC) developed by the authors, which ensure finding the optimal coefficients x₁^* and x₂^* under all given conditions for  the design of TG. The mathematical models that are necessary for the construction of the blocking circuits of the studied TG locomotives of series 2M62, 2TE116, TEP70 and electric trains of the ER2 and ER2R series are presented. For the found values of coefficients x₁^* and x₂^* using the developed methodological and software, all design
parameters, characteristics and indicators of gearing of gears and wheels necessary for determination of technical resource of TG are calculated. As a quantitative indicator consider the magnitude of the runs of the locomotive (motor section) from the beginning of operation until the emergence of marginal wear of the cogwheels L₁ and wheels L₂ at appropriate constant strokes.
Examples of LC and the results of the computational study for the TG are given. According to the research results it is established that by using the gears and wheels defined in the optimization design of gears and wheels, a significant increase in the technical resource of the TG can be achieved. By L₂: up to 20% for locomotives 2M62, up to 7% for locomotives 2TE116, 16% for locomotives TEP70, 11% for electric trains of the ER2 and ER2R series. By indicator L₁: up to 18% for locomotives 2M62, up to 2% for locomotives 2TE116, 16% for locomotives TEP70, 11% for electric trains of the ER2 and ER2R series. This indicates that there are significant reserves to increase the technical resources of the TG of the existing rolling stock of railways due to their optimization design. To identify them, it is advisable to use the method of optimization design of traction gear presented in the article.