首页|Cause analysis and countermeasure on premature failure of a driven gear for the high-speed train
Cause analysis and countermeasure on premature failure of a driven gear for the high-speed train
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NSTL
Elsevier
The premature cracking failure of a driven gear occurred in a high-speed railway gearbox of a certain line after running 600,000 km. The comprehensive analysis methods, such as physical and chemical inspection, morphology observation and inspection of the meshing surface, magnetic particle inspection, Barkhausen noise analysis (BNA) inspection, etc., were used to analyze the abnormal failure of the gear. The results showed that the failure mechanism of the gear was rolling contact fatigue (RCF), which was mainly caused by the reduced hardness and contact fatigue strength of the meshing surface from grinding burn due to improper grinding process. Both sides of the microcracks bore the internal extrusion pressure under the oil wedge effect, leading to the fatigue growth of the cracks and subsequent peeling failure. Based on the analysis results, the root causes were finally found and the pertinent prevention measures for the similar gears in service were proposed.
NSTL
Elsevier
