Influence of Roller Crown Modification and Eccentric Load on Contact Stress of Rolling Bearing
In view of the influence of needle convexity modification and partial load on contact stress of rolling bearing,KIRD234021-YA rolling bearing is taken as the research object.First of all,four kinds of complete finite element models are es-tablished,which are non partial load roller with convexity,non partial load roller without convexity,partial load roller with con-vexity and partial load roller without convexity.Secondly,using Nastran software to analyze the mechanical properties of the four models respectively,and obtain the stress nephogram of the roller and the inner ring.The research results show that under the con-dition of no eccentric load,the stress distribution of roller with and without crown is consistent,and there is no difference between the two rollers.Under the condition of partial load,the stress distribution of the two rollers is quite different.The stress distribution of the bearing needle with convexity modification is more uniform,and the maximum stress value is relatively small.The maxi-mum stress value of the bearing needle with convexity modification is 45％lower than that of the bearing needle without convexity modification,and it is consistent with the stress distribution law of the bearing inner ring.Finally,four kinds of bearings are test-ed by fatigue life testing machine,and it is found that the wear condition of bearing needle is similar to the simulation result.It is verified that the convexity modification of the needle roller can effectively improve the uniformity of stress distribution,relieve the stress concentration and reduce the wear of the bearing,especially in the case of partial load.
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