过盈配合量和预紧力对高速角接触球轴承刚度的影响

Effect of the interference fit and axial preload in the stiffness of the high-speed angular contact ball bearing

以滚动轴承拟静力学分析和滚道控制理论为基础,给出了计及轴承安装时的过盈配合量、预紧力等因素的影响,以及计算高速角接触球轴承中钢球与内、外圈的接触刚度和轴承整体的径向刚度、轴向刚度和角刚度的完整方法和相应的程序.对B7004轴承的分析表明:配合过盈量增加,钢球与内、外圈的接触刚度以及轴承的径向刚度增大,而轴承的轴向刚度和角刚度减小;预紧力增加,钢球接触刚度、轴承刚度随之增加;预紧力较小,特别当旋转速度较高时,应仔细选择合适的预紧力,否则轴承刚度会出现不稳定的波动.

Based on the pseudo statics analysis and raceway control theory of the bearing, the comprehensive method and its corresponding ＂program were given for calculating contact rigidities between balls and raceways and radial, axial, angle rigidities of the bearing by analysing the effect of the interference fit and axial preload, etc. The results from taking B7004 bearing as an example show that the contact rigidities between balls and raceways, radial rigidity of the bearing increase and axial, angle rigidities decrease as the interference fit increases; the contact rigidities and bearing rigidities increase with the increase of axial preload; when the axial preload is smaller, especially when the rotation speed is higher, the axial preload should be carefully selected, or the bearing rigidities will exhibit unstable fluctuations.