Influence of impact loads on the dynamic characteristics of plastic cages in railway axle bearings

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (1) : 172-180.

HUANG Yun-sheng1, DENG Si-er1,2,3, ZHANG Wen-hu3, HU Jie1,3, SUN Li-ming4，MA Zikui5

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Abstract

Besides supporting the direct heavy load above the primary suspension, railway axle box bearings also bear the impact loads passed from the wheel and rail interaction due to track irregularity. The cage bridge fracture because of impact loads is one of the main factors leading to the early invalid ity of bearings. The influence of the impact from wheel flat on the vehicle system was analyzed and taken as the boundary condition in bearing dynamics analysis. The discrete element approach was used to model the elastic cage. The influences of impact loads on the axle bearing cage dynamic characteristics, the contact force between the roller and cage and the stress distribution in the cage were researched. The results show that the contact force and contact frequency between the roller and cage increase significantly with the increase of the impact acceleration, which will speed up the fatigue failure of the cage. It can be judged from the cage strength analysis that the external heavy impact acceleration from the wheel and rail interaction will lead to the instant fracture of cage bridges.

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wheel-rail impact / elastic cage / impact strength / fracture failure

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HUANG Yun-sheng1, DENG Si-er1,2,3, ZHANG Wen-hu3, HU Jie1,3, SUN Li-ming4，MA Zikui5. Influence of impact loads on the dynamic characteristics of plastic cages in railway axle bearings[J]. Journal of Vibration and Shock, 2018, 37(1): 172-180

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