销轴设计方法的比较研究

THE COMPARISON RESEARCH ON DESIGN METHODOLOGY OF PINS

销轴几何尺寸设计时通常以静剪切强度为准则,忽略了销轴的弯曲变形和润滑油孔应力集中,此种方法设计的销轴往往出现早期失效。分别对销轴的静剪力、惯性矩、考虑应力集中时的设计准则进行了建模,并通过三种设计方法之间的对比,发现不同设计方法所设计的销轴直径不同,并且直径的差异程度与销轴的作用载荷及材料的屈服强度有关;分析了三种假设应力分布模型的最大应力,发现采用不同假设应力分布模型所计算的最大接触应力不同,并且接触应力的差异程度与销轴的作用载荷有关。同时发现最大接触应力随着配合间隙的增大而增大。

Geometry design of pin is usually performed on static shear strength criterion, ignoring the pin bending deformation and stress concentration of lubrication hole. The pin which is designed by static shear strength criterion appears premature failure. The design methods considering static shear, bending deformation and stress concentration proposed in this paper. Through the comparison among three design methods, it finds that the diameter designed with different method are different, which is associated with load and yield strength; The maximum contact stress of three stress distribution models have been analyzed, it finds that the contact stress calculated with different stress distribution models are different, which is related to load. The maximum contact stress increases with the increase of fit clearance.