This article discusses the measures for efficient use of fuel and energy resources in the railway industry. The calculation of the initial moment of starting the diesel engine and the necessary position of its crankshaft is made, on the basis of which it is proposed to modernize the locomotive start-up system with a decompressor. These measures are aimed at reducing the dynamic loads of engine components and reducing their wear and tear, as well as failure preventing. A method for the clean-up of fuel systems and the cylinder-piston diesel engine group of diesel locomotives was developed and tested using a special cleaning liquid that dissolves and removes solidified particles from pipelines and tanks. Measures have been proposed on the use of advanced models to test the modernized locomotives that will reduce the duration of the tests, resource and economic costs. The use of advanced testing model involves choosing the level of accuracy of the test results and, consequently, their duration and cost.
This paper analyzes various types of startup systems used for the heat and power facility start-up. Factors impacting startup characteristics of the heat and power facility were considered. Methods for the modernization of the startup system and possible revamping of auxiliary starting aid devices of locomotive diesel engines without significant design changes by means of cylinder test valve opening were identified. Kinematic diagrams of device gearing for automatic decompression of the heat and power facility cylinders were developed and analyzed. The device requirements were determined, namely, response time, cylinder test valve open and closing torque overriding Tmin=11 Nm. Based on the necessity of torque backup at least 30 % the gear ratio required for the selected engine and its dimensions was calculated.
This paper presents an issue of rolling stock pulling drive gear (PDG) reliability assessment in operation, considering the gear and pitch wheel wear. Among main damages attributive to gear and pitch wheel reject are cheeping of teeth, peeling, plastic deformation. It is noted that the PDG reliability assessment shall be reasonably carried out upon a significant probability of their fail-safe operation that is determined by the rolling contact fatigue resistance. The provided mathematical study design on the PDG reliability assessment of ER-2 electrical multiple train and the corresponding mathematical model PH
.=f(Δ
1
, Δ
2
) is developed. The auxiliary curve is added to the reasonable selection of gear-pitch wheel pair. The provided materials allow to reasonably select gear-pitch wheel pairs obtaining the maximum pulling drive gear fail-safe operation probability values that result in the reliability increase. Recommendations on the further application of the suggested approach during repair of pulling drive gears of modern rolling stock are provided.
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