变曲率圆弧球面滚子轴承力学性能分析

Contact Stress Analysis of Variable Curvature Arc Spherical Roller Bearings

根据球面滚子轴承承载过程中存在的问题,提出了两种改变接触应力分布的方法:第一,在不同的载荷下改变滚子-滚道的密合度大小,使得在任一种载荷下接触区域长度都等于滚子有效长度,并给出密合度变化随载荷变化的曲线;第二,利用变曲率圆弧法对球面滚子轴承进行修形。基于Bouss-inesque弹性接触理论,编制计算机程序并计算球面滚子轴承的接触应力,在赫兹理论范围内对程序结果进行了验证,与赫兹解的对比表明,程序计算结果很精确。在此基础上对两种方法设计的轴承进行了应力计算,结果表明,经过程序计算修形后的滚子最大接触应力显著减小,相应的轴承寿命也得到大幅度提高。

Two methods to reduce the stress value were presented herein according to the problems of stress distribution of spherical roller bearing： first,optimize the ratio of osculation coefficient under different load conditions;second,divide the available length of the roller to several sections evenly,and the radius of the roller between every section is different.Based on Boussinesque plastic contact theory,a numerical method was used to develop a computer program to calculate the stress on the roller-race contact areas.Compared to Hertz theory,the contact stress and other data of the program are exact enough.The contact stress is reduced to a large extent by the crown profiled method,accordingly the life of the bearing increases significantly.