转向节在装配过程中的力学特性分析  

Investigation on mechanical properties of steering knuckle in assembly process

作　　者：牛晓燕[1] 王忠海[1] 王桂香[1] 

机构地区：[1]河北大学建筑工程学院,河北保定071002

出　　处：《河北大学学报（自然科学版）》2015年第1期11-16,共6页Journal of Hebei University(Natural Science Edition)

基　　金：河北省自然科学基金资助项目(A2012201003);河北大学引进人才基金资助项目(2010-187)

摘　　要：对装配过程中转向节节臂锥孔拉大、球销沿锥孔方向位移过大等问题，借助有限元计算软件Abques，分析了转向节在装配过程中的力学特性．结果表明：轴向力一定，锥孔面上摩擦系数增大时，球销进入锥孔量和孔面受到的挤压力均减小；摩擦系数一定，随轴向力的增大，其值均增大．在轴向力为19.OO～27.22kN下，锥孔内应力已经超出材料的屈服强度，甚至材料出现失效现象，降低了转向节的稳定性，致使汽车在运行时存在严重的安全隐患．针对上述情况，提出可适当增大球销与节臂锥孔接触面处的摩擦系数，或提高锥孔内表面梯度最大处的强度，来抵抗塑性变形的产生．指出摩擦系数一定时，存在最佳的压装力，可为制定最佳的装配参数提供指导．Considering the problem of expansion of conical hole and the severe deformation of spherical pin along the direction of the conical hole in the assembly process of steering knuckle, the mechanical prop- erties of steering knuckle in assembly process were analyzed by using of finite element software Abques. When axial force was invariable, the interference between ball pin and conical hole and the pressure of pore surface were decreased with the increase of ffiction. Similarly, when ffiction coefficient was certain, the interference between ball pin and conical hole and the pressure of pore surface were increased with the in- crease of axial force. In most instances, the pressure exceeds the yield strength, and crushing phenomenon often appeared. As a result, the stability of the steering knucklwe was reduced, and there were serious danger hidden in the car at runtime. So some improvement approach was proposed to solve the problem. One was improving the ffiction coefficient between the spherical pin and knuckle arm conical hole, and the other was improving the strength of materials located in the maximum gradient of conical hole surface.

关 键 词：转向节 轴向力 摩擦系数 塑性变形 

分 类 号：U463.46[机械工程—车辆工程]