圆锥滚子修形对接触副应力分布的影响

Abstract

滚动轴承中的滚子修形是减小接触副边缘处应力集中、提高轴承疲劳寿命的重要手段。本文建立了修形圆锥滚子–滚道接触模型，基于影响系数法进行求解，分别计算了轻载和重载工况下接触副的接触应力分布，并针对不同滚子修形对接触应力的影响进行了分析。结果表明，滚子的对数修形改善应力分布的效果较优，最佳修形曲线与实际工况条件相对应；圆锥滚子–滚道接触副的应力分布并不是关于滚子中线对称的，且滚子小端的接触应力大于滚子大端的接触应力。 Roller crowning of rolling element bearings is an important means to reduce the stress concentra-tion at the edge of contact pairs, and to improve bearing fatigue life. The contact model of crowned tapered roller/raceway contact pair is established in this paper, which is solved based on influence coefficient method. The stress distribution of contact pair under light load and heavy load conditions are calculated respectively, and then the effects of tapered roller with different crowning curves on the contact stress distribution are analyzed. The results show that the logarithmic crowning has an optimal effect on contact stress distribution. However, the optimum modification curve corresponds to the actual working conditions. Moreover, the contact stress distribution of tapered roller/raceway contact pair is not symmetrical about the center line of roller, and the contact stress of the small end of roller is greater than the stress of the large end.