Fatigue Failures of the 353130B Type Roller Bearings on China RailwayFreight Cars
Causes are analyzed to the three shelling failures of railway 353130B type of rollerbearings on China 70t grade of freight cars with K5 type of tilting bogie.These bearings are all failedin service lives less than two years,which is quit less than the overhaul inspection interval of 800,000km mileage of vehicles and the design life of 2,000,000 km mileage.The failures are all originatedfrom the position at the outer ring inboard side nearly to the seal seat.Metallurgical observationsreveal that the material chemical composition and microstructures are all in the reasonable rangeexcept for the hardness values.This implies that the manufacturing techniques may not match therequirements to lead to the reduction of fatigue strength.Elastic-plastic finite element (EPFE)analysis reveals that the position at the outer ring inboard side nearly to the seal seat is subjected tothe maximum equivalent stress amplitude,which well match the situations of failures.In addition,acomparison is made to the bearing on the same axle weight freight cars But K6 type of bogie.Resultsreveal the maximum stress amplitude for K5 type of bogie is larger than that for K6 type of bogie.This means the bearings failures are relative to the local structures.Therefore,both the manufacturingtechniques and the bogie structures should be advanced to improve the bearing service lives.
Railway Freight car Roller bearing Fatigue Failure
L.Chen
Freight Car Section,Transportation Management Administration,Minister of Railway of China,Beijing 100084,China
国际会议
成都
英文
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）