考虑热效应的局部缺陷角接触球轴承动态特性研究

Dynamic characteristics of angular contact ball bearings with localized defects considering thermal effect

针对高速运转时具有局部缺陷角接触球轴承运行工况复杂而难以准确描述的问题,本文以外圈具有局部缺陷的角接触球轴承为研究对象,建立考虑热效应和高速效应的局部缺陷角接触球轴承拟静力学模型和接触刚度模型,研究在不同影响因素下的角接触球轴承动态特性。结果表明:考虑热效应时,轴承的接触载荷和接触刚度都有明显的增大;局部缺陷的轴向角度越大,滚动体陷入缺陷的深度越大,缺陷区域的接触刚度越小;局部缺陷的环向角度越大,滚动体陷入缺陷的数量越多,非缺陷区域接触载荷越大。

Aiming at the problem that the operating conditions of angular contact ball bearings(ACBBs) with local defects are complex and difficult to describe accurately at high speed,the quasi-static model and contact stiffness model of ACBB with local defects considering thermal effect and high-speed effect were proposed.The dynamic characteristics of ACBBs under different influencing factors were studied.The results show that the contact load and contact stiffness of the bearing increase obviously when the thermal effect is considered.The greater the axial angle of the local defect,the greater the depth of the roller falling into the defect,and the smaller the contact stiffness at the defect area.The larger the circumferential angle of local defects,the more the roller falls into defects,and the greater the contact load in the non-defect area.