外隔圈不平行度对轴承性能影响的数值分析

Numerical Analysis for Impact of Spacing Ring Nonparallelism on Bearing Performance

为给轴承隔圈精度设计及制造误差控制提供理论依据,进行了外隔圈平行度不良引起单列轴承倾斜运转时的性能分析。首先用外隔圈端面倾斜角来描述其不平行度,分析了其倾斜角对轴承安装姿态的影响,继而以滚动轴承拟静力学分析为基础,给出了考虑外隔圈不平行度的角接触球轴承动力特性计算方法,并分析了外隔圈不平行度对轴承生热的影响。以7014C轴承为例,在轴向力为400N、外隔圈端面倾斜角为0.018 2°的情况下,计算的最大接触应力增大了2.15%,且该值随着倾斜角的增加而增大。同时,外隔圈的不平行度会引起球接触区域发热不均匀,在径向载荷作用下,外隔圈不平行度引起的轴承发热更明显。大多数机床主轴是在承受径向载荷工况下工作,因此外隔圈平行度不良的影响不容忽略。

To theoretically investigate spacing ring accuracy and manufacturing error control,the impact of outer spacing ring nonparallelism on the tilt of single row bearing is discussed.The oblique angle of outer spacing ring end face is taken to describe its nonparallelism,the influence on bearing installation position is then analyzed.Following the pseudo statics analysis for bearing,the computing method is proposed to evaluate the dynamic characteristics of high-speed angular contact ball bearing,where the accuracy of outer spacing ring and bearing heating are considered.Taking 7014C bearing as an example,the calculated maximum contact stress increases by 2.15％ as axial force is 400 N and oblique angle of outer spacing ring 0.018 2,and increases with the augmented oblique angle.Outer spacing ring nonparallelism results in uneven heating at each ball contact area,especially under radical loads.Most of machine tool spindles work under radial loads,the adverse effects of outer spacing ring parallelism cannot be ignored.