基于有限元方法的内圈装反轴承受力分析与寿命评估

Force Analysis and Life Evaluation of Inner Ring Reverse Bearing Based on Finite Element Method

针对内圈装反的轴承,根据其径向载荷分布建立了有限元模型,研究了接触部位网格细化对接触应力的影响,确定了合适的网格大小。根据ISO国际标准理论算法计算了正确安装轴承的寿命,通过L-P寿命理论和ASH法则得到了内圈装反轴承的寿命,并对比分析了不同凸悬量对内圈装反轴承的寿命影响。结果表明,接触部位网格大小选择0.1 mm,不仅能保证计算精度,且能较大程度减少计算量;内圈装反轴承的内圈、外圈和滚子寿命较正确安装轴承下降幅度显著,分别为正确安装轴承寿命的14.74%、78.64%、52.98%。不同凸悬量对内圈装反轴承的内圈、外圈和滚子寿命影响程度不同,随着凸悬量的增大,三者的疲劳寿命均下降,其中对轴承内圈的寿命影响最大。

In this research,the finite element model was established,the influence of the mesh refinement of the contact position on the contact stress was studied,and the appropriate mesh size was determined,according to the radial load distribution of the inner ring bearing.And according to the ISO international standard theoretical algorithm,the life of the correctly installed bearing was calculated,and the life of the inner ring reverse bearing was obtained by Lmurp life theory and ASH rule,and the influence of different convex suspension on the life of the inner ring reverse bearing was compared and analyzed.The results show that the selection of 0.1 mm mesh size of the contact position can not only ensure the calculation accuracy,but also greatly reduce the amount of calculation;the life of the inner ring,outer ring and roller of the inner ring reverse bearing is significantly lower than that of the correctly installed bearing,which is 14.74%,78.64% and 52.98% of the life of the correctly installed bearing respectively.Different convex suspension has different influence on the life of inner ring,outer ring and roller.With the increase of convex suspension,the fatigue life of the three decreases,but it has the greatest influence on the life of the inner ring of the bearing.