计及芯轴变形的轴连轴承载荷分布和刚度计算

因轴连轴承高承载能力和长寿命的性能指标要求，提出三列滚动体混合式结构，通过两端圆柱滚子线接触形式提高轴承整体承载能力。为考核新型轴连轴承承载性能，基于柔性梁理论引入芯轴挠曲变形的影响，采用滚动轴承设计方法，建立新型轴连轴承力学分析模型，在此基础上研究了外载大小、外载位置和游隙因素对轴承载荷分布和刚度的影响。载荷分析表明:径向载荷增加，芯轴在各滚动体列产生的附加力矩增加，各滚动列最大接触载荷增大；载荷作用距离减小，芯轴在各滚动体列产生的附加力矩减小，各滚动体列的承载载荷明显下降；滚子列径向游隙的增加，各滚动体列的最大接触载荷增大，承载区域减小，载荷分布均匀性下降。刚度分析表明随着径向载荷增大，各滚动体列主刚度明显上升，而载荷作用距离减小和滚子列径向游隙增加，会造成各滚动体列主刚度一定程度下降。 

Load distribution and stiffness calculation of integral shaft bearings considering mandrel deformation

Due to the high load-bearing and long-life performance requirements of the integral shaft bearings, a three-row rolling element hybrid structure was proposed to improve the overall carrying capacity by line contact at the both sides of bearing. In order to evaluate the bearing performance of the new bearing, a mechanical analysis model considering the influence of the shaft deflection of the bearing was established based on the rolling bearing design method and the flexible beam theory. Then, the influences of external force, external force position and clearance on the loading distribution and stiffness of bearing were studied in detail. The load analysis shows that with the radial force increase, the additional torque generated by the shaft and the maximum contact load of each rolling row increase; with the force acting distance decrease, the additional torque generated by the shaft and the bearing load of each rolling row significantly reduce; when the radial clearance of the roller row increases, the maximum contact load of each rolling row increases, the bearing area decreases, and the load distribution uniformity decreases. The stiffness analysis shows that with the radial force increase, the main stiffness of each rolling row increases significantly; however, the decrease of the load acting distance and the increase of the radial clearance of the roller row will cause the main stiffness to decline to a certain extent.