高速角接触轴承保持架结构特性的数值模拟

Analysis of Dynamic Characteristics of High-speed Angular Contact Bearing Cage with Changing Structural Parameters

保持架是高速角接触球轴承的重要结构部件,保持架的结构参数变化影响着轴承的运动特性与共振特性。以7218B轴承为研究对象,借助ABAQUS有限元分析平台,建立了滚动轴承的动力学及模态分析的有限元数值模型。研究并分析了轴承的保持架在不同滚动体个数与不同兜孔间隙下的角速度和质心涡动速度偏差比变化规律。通过模态振动模型,分析了不同保持架结构参数下的模态振型与共振频率。通过研究发现:随着保持架滚动体个数的增加,保持架的角速度波动和质心涡动速度偏差比逐渐降低,但是增大了保持架发生共振的风险;当增加保持架的兜孔间隙时,保持架的角速度波动幅度和质心涡动速度偏差比小范围增大,但是波动幅度较小,保持架固有频率减小,共振风险增大。

Cage is an important structural component of high-speed angular contact ball bearing.The change of structural parameters of cage affects the motion and resonance characteristics of bearings.Taking 7218B bearing as the research object,the finite element model of bearing dynamic analysis and modal analysis is established with ABAQUS finite element software.The variation law of angular velocity and centroid eddy velocity deviation ratio of cage with different number of rolling elements and different pocket gaps is studied,and the modal shapes and resonant frequencies of cage under different structural parameters are analyzed by modal analysis model.It is found that with the increase of the number of cage rolling bodies,the deviation ratio of angular velocity fluctuation and centroid eddy velocity of cage decreases gradually,but the resonance risk increases.With the increase of cage pocket clearance,the deviation ratio of angular velocity fluctuation and centroid eddy velocity increases slightly,but the change is small.The natural frequency of cage decreases and the resonance risk increases.