ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2020, Vol. 41 ›› Issue (5): 423347-423347.

• Material Engineering and Mechanical Manufacturing •

### Atypical failure mechanism of aero-engine main shaft roller bearing

ZHENG Jintao1, DENG Sier1,2,3, ZHANG Wenhu1, DANG Xiaoyong4

1. 1. School of Mechatronics Engineering, Henan University of Science and Technology, Luoyang 471003, China;
2. National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Luoyang 471003, China;
3. Collaborative Innovation Center of Major Machine Manufacturing in Liaoning, Dalian 116024, China;
4. Beijing Power Machinery Institute, Beijing 100074, China
• Received:2019-08-05 Revised:2019-08-31 Online:2020-05-15 Published:2019-09-27
• Supported by:
Young Scientists Fund of the National Natural Science Foundation of China (51905152); Natural Science Foundation of Henan Province (162300410086); Science and Technology Planning Project of Henan Province (172102210254)

Abstract: Based on the dynamic analysis of rolling bearings, this paper presents dynamics differential equations of high-speed cylindrical roller bearing, considering the roller dynamic unbalance and the collision and friction between the roller and the rib, aiming at the atypical failure of aero-engine cylindrical roller bearing.The problem is solved by the GSTIFF (Gear stiff) integer algorithm with variable step. And the influence of the bearing condition parameters and the structural parameters on the maximum skew angle of the dynamic unbalanced roller and maximum collision force between the roller and the rib are analyzed. The results show that the maximum skew angle of the roller and the maximum collision force between the roller and the rib increase with the roller dynamic unbalance and the inner ring rotation speed, showing no obvious correlation with the radial load. The smaller axial clearance can effectively suppress the roller skew, but it will increase the impact force between the roller and the rib. And a reasonable axial clearance range makes the collision force between the roller and the rib small when the roller skew angle is not excessive. The smaller cage pocket circumferential clearance and the rib negative back angle and the larger roller ball end face radius can reduce the maximum skew angle of the roller and the maximum collision force between the roller and the rib.

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