机体杆端轴承油封磨损特性分析

Analysis on Wear Characteristics of Oil Seal in Airframe Rod End Bearings

建立了机体杆端轴承油封磨损有限元模型,分析了油封结构参数(密封圈内径、密封圈厚度、金属骨架轴向尺寸、金属骨架内径)和轴承动力学特性(轴承腔内温度、摆动频率、摆动幅值)对油封磨损特性(接触应力、接触宽度)的影响,结果表明:随运行时间增加,最大接触应力减小,接触宽度增大;油封结构参数对油封磨损影响较大且复杂,密封圈内径9.2 mm、厚度0.4 mm、金属骨架轴向尺寸2.2 mm的油封磨损特性稳定;油封磨损随轴承摆动频率和幅值增大而增大;轴承腔内温度对油封磨损影响不大。对优化后的油封进行仿真分析和试验验证,优化后油封变形量减小,润滑脂保持率提升了17.3%。

The finite element model is established for wear of oil seal in airframe rod end bearings,the influences of structural parameters(inner diameter of seal ring,thickness of seal ring,axial dimension of metallic framework,inner diameter of metallic framework)of oil seal and dynamic characteristics(temperature in bearing cavity,oscillating frequency,oscillating amplitude)on wear(contact stress,contact width)of oil seal of the bearings are analyzed.The results show that:with the increase of running time of the bearings,the maximum contact stress decreases,and the contact width increases;the structural parameters of oil seal have large and complex influences on wear of oil seal,the wear characteristics of oil seal with seal ring inner diameter of 9.2 mm,thickness of 0.4 mm and axial dimension of metallic framework of 2.2 mm is more stable;the wear of oil seal increases with increase of oscillating frequency and amplitude of the bearings;the temperature in bearing cavity has little effect on wear of oil seal.The simulation analysis and experimental verification of optimized seal show that the deformation of oil seal is reduced and the retention rate of grease is increased by 17.3%.