机体杆端摆动轴承的摩擦力矩特性研究

Friction torque characteristics of airframe rod end swing bearing

针对频繁摆动工况中的轴承而言,要求其在良好的润滑密封性能基础上具有较小的摩擦力矩,为了减小机体杆端摆动轴承的摩擦力矩,对机体杆端摆动轴承的摩擦力矩特性进行了研究。首先,对机体杆端摆动轴承的主要部件进行了动力学分析;然后,根据力学平衡关系,建立了机体杆端摆动轴承的动力学微分方程组;最后,开展了机体杆端摆动轴承主要的工况参数(包括:摆动频率、摆动幅值、径向载荷、轴向载荷和润滑脂摩擦系数)和结构参数(包括:内圈沟曲率半径、外圈沟曲率直径和钢球直径)对机体杆端摆动轴承摩擦力矩影响的研究。研究结果表明:摩擦力矩受轴承工况参数和内圈沟曲率半径的影响较大,而受外圈沟曲率直径和钢球直径的影响不大;机体杆端摆动轴承不仅不能承受太大的轴向载荷,而且还要保证其良好的密封性能;针对摩擦力矩特性的研究为机体杆端摆动轴承的设计和应用提供了理论支撑。

For bearings in frequent swinging conditions,it is required to have a small friction torque on the basis of good lubrication and sealing performance.Aiming at the problem of how to reduce the friction torque of the airframe rod end swing bearing,the friction torque characteristics of the airframe rod end swing bearing was studied.Firstly,the main components of the airframe rod end swing bearing were analyzed mechanically.Then,the dynamic differential equations of the airframe rod end swing bearing were established according to the mechanical equilibrium relationship.Finally,the effects of the main working condition parameters(including the swing frequency,the swing amplitude,the radial load,the axial load and the grease friction coefficient)and structural parameters(including the inner ring groove curvature radius,the outer ring groove curvature diameter and the steel ball diameter)on the friction torque of the airframe rod end swing bearing were studied.The results show that the friction torque is greatly affected by the working condition parameters of the bearing and the curvature radius of the inner ring groove,but not by the curvature diameter of the outer ring groove and the diameter of the steel ball.The airframe rod end swing bearing can not only bear too much axial load,but also ensure its good sealing performance.The study of friction torque characteristics provides a theoretical support for the design and application of the airframe rod end swing bearing.