考虑疲劳故障的圆柱滚子轴承打滑失效分析

Skidding Analysis of Cylindrical Roller Bearing Considering Fatigue Failure

考虑滚道疲劳剥落故障、滚动体与保持架之间的非连续接触等因素,建立圆柱滚子轴承的非线性弹性接触显式动力学模型,研究不同剥落故障位置、径向载荷、内圈转速对滚动体和保持架打滑特性的影响规律;将仿真结果与理论解进行对比,验证有限元模型的有效性。研究结果表明:滚动体在非承载区更容易出现打滑;相同工况下剥落故障会使得滚动体和保持架的打滑率大幅增加,其中复合故障下的打滑率增加最多,内圈故障和外圈故障下的打滑率增幅基本相同;增大径向载荷能有效减轻轴承的打滑现象,但载荷增加到一定程度后对打滑的抑制效果不明显;低转速工况下内圈和外圈疲劳故障对轴承打滑率的影响不大,随着转速的提高疲劳故障对打滑率的影响愈加明显。

Considering the fatigue failure of the raceway,the discontinuous contact between the rolling element and the cage,the nonlinear dynamic contact model of the cylindrical roller bearing was established.The influence of the location of different failures,radial load and rotational speed on the slip characteristics of the rolling element and the cage were studied.The simulation results were compared with the theoretical solution to verify the validity of the finite element model.The results show that the rolling elements are more likely to slip in the non-load bearing area.The slip ratio of the rolling elements and the cage will be greatly increased by the peeling failure under the same working conditions,especially the slipping rate is increased most by the compound faults,while the slip rate is increased almost the same by the inner ring fault and the outer ring fault.The slippage of the bearing can be effectively reduced by increasing the radial load,however,t he effect of restraining the slip is not obvious after the load is increased to a certain extent.The fatigue failure of the inner and outer rings has little effect on the slip rate of the bearing under low-speed conditions,and the effect of fatigue failure on the slip rate is increased with the increase of the rotational speed.