Damaging problems of power and heat-stressed assemblies of locomotive diesels. Analytical review
Medium-speed diesel engines were developed in the 1960s for a wide range of applications, the main of which was the replacement of obsolete power plants on diesel locomotives and the increase in the efficiency of diesel locomotives. The main structural elements of the engine had to have reserves of...
| Main Authors: | , |
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| Format: | Article |
| Language: | Russian |
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Joint Stock Company «Railway Scientific and Research Institute»
2017-04-01
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| Series: | Вестник Научно-исследовательского института железнодорожного транспорта |
| Subjects: | |
| Online Access: | https://www.journal-vniizht.ru/jour/article/view/139 |
| Summary: | Medium-speed diesel engines were developed in the 1960s for a wide range of applications, the main of which was the replacement of obsolete power plants on diesel locomotives and the increase in the efficiency of diesel locomotives. The main structural elements of the engine had to have reserves of strength and durability, allow achieving high power of a single engine due to forcing the work process and increasing the number of cylinders. During the trial operation, numerous cases of damage and failure of the most important power and heat-stressed components were noted. The article critically analyzes the results of studies to improve the reliability and resource life of pistons, cylinder covers, assemblies “crankshaft - bearing”.As a result of work to improve the reliability of pistons was introduced cooling the piston head by shaking, in the area of the piston rings the circulation of motor oil was added in place of the previously used jet cooling. For the cylinder cover, the most effective was the introduction of structural changes in the bottom profile, which allowed to lower the levels of cyclic thermal stresses. Performance of the “crankshaft - bearings” assembly was guaranteed due to the transition from the shaft suspension with the geared connector to the suspension structure with the flat joint and the load tightening of the joint, and to the completely balanced steel crankshaft. The indicator of the bearing width is increased in relation to the diameter of the shaft neck of the main and connecting rod bearings. The article provides an analysis of published data on cylinder head and crankshaft bearing failures on diesel locomotives for several years of operation prior to the introduction of changes and after. The study showed the effectiveness of the structural and technological measures taken. |
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| ISSN: | 2223-9731 2713-2560 |