虎克万向节节叉轴承滚针的凸度设计

虎克万向节十字轴节叉轴承的滚针凸度决定了滚针与滚道间接触压力的分布状况，是影响万向节性能和寿命的主要因素之一．为改善万向节的性能，文中基于Lundberg对数凸型方程和三维有限长弹性接触问题的数值计算，分析了轴承结构参数对接触压力分布的影响，提出滚针凸度量设计时必须考虑滚针倒角半径和越程槽宽度的影响，并给出了相应的数值计算方法．使用该方法设计的滚针轴承，可以避免接触压力分布出现“边缘效应”，也可避免在接触区域发生部分应力集中，提高了万向节的性能和使用寿命．

Design of Crown Drop on Needle Roller of Trunnion Bearing in Hooke's Universal Joint

In the trunnion bearing of a Hooke's universal joint,the crown drop on the needle roller determines the contact pressure distribution between the needle and the raceway,and is one of the most important factors to affect the capability and life of the joint.In order to improve the capability of Hooke's universal joints,the effects of structural parameters on the contact pressure distribution are analyzed based on Lundberg's logarithmic equation and the numerical calculation of three-dimension elastic contact problems in finite length.It is suggested that,in the design of crown drop,both the chamfer radius and the grinding undercut width should be considered.More-(over), the corresponding numerical method to calculate the crown drop is presented,by means of which the trunnion bearings can be designed without the "edge effects" of the contact pressure distribution and the high-pressure concentration in the contact region.As a result,the capability and service life of the designed Hooke's universal joint are improved.