交叉圆柱滚子转盘轴承的滚子偏载分析及修形

Unbalance Loading Analysis and Profile Modification of Roller of Crossed Cylindrical Roller Slewing Bearings

针对联合载荷作用下交叉圆柱滚子转盘轴承的滚子与滚道之间接触应力分布的'偏载效应'和'边缘效应'问题,提出在轴承游隙合理取值的前提下,通过对滚子的修形设计来改善滚子滚道接触状况的有效方法。对轴承的整体力学系统进行建模和求解计算,采用有限长线接触理论研究轴承游隙对滚子偏载的影响。在合理轴承游隙下,研究滚子在不同凸度量时滚子与滚道之间的接触应力分布情况。研究结果表明:滚子偏载后接触应力沿接触线呈现不对称分布,重载端压力增大而轻载端压力减小,并且这一趋势随着轴承游隙值的增大而趋于显著。通过对滚子的适当修形可以改善'偏载效应',并消除'边缘效应'。滚子的凸度量越大,效果越显著,但滚子载荷有向滚子中部集中的趋势。在综合考虑这些影响的基础上确定出联合载荷作用下的交叉圆柱滚子转盘轴承的滚子最佳修形参数。

For the problem of unbalance loading effect and edge loading effect of the contact stress distributions between the rollers and the raceway of crossed cylindrical roller slewing bearing under combined loads, the effective method for improving the roller and raceway contact state is put forward. This method is realized through the profile modification design of rollers under the premise of reasonable bearing clearance. The whole mechanical system of the bearing is modeled and solved, and the effect of the bearing clearance on the unbalance loading of the roller is researched by using the finite length line contact theory. Under the reasonable bearing clearance, the contact stress distributions between the rollers with different crowning values and the raceway are researched. The results show that the contact stress distribution of the roller appears asymmetric along the contact line after the roller suffers unbalanced load, the stress on the heavy end increases while on the light end decreases, and this trend tends to be more significant with the increase of the bearing clearance value. The unbalance loading effect can be improved and the edge loading effect can be eliminated by proper profile modification of the roller. The larger the crowning value of the roller, the more significant effect gets, but there exists the trend of the load concentrating to the central section of the roller. On the basis of considering these influence, the best profile modification parameters of the roller is determined for the crossed cylindrical roller slewing bearing under combined loads.