对数凸型滚针凸度量设计的新方法

本文利用三维有限长弹性接触问题的数值解法分析了实体套圈滚针轴承中的越程槽结构因素对对数凸型滚针接触压力分布的影响。结果表明,套圈上的越程槽宽度是确定滚针最佳凸度量时应考虑的一个重要因素。据此给出了对数凸型滚针凸度量设计的新方法。该方法可用于各种结构形式滚针轴承的滚针凸度量设计。

A New Numerical Evaluation of Crown Drop for a Needle Roller with Lundberg' s Profile

Needle roller bearings are used to support heavy radial loads. If the rollers and raceways of the bearings have straight generatrices of motion, then notwithstanding relatively light loading, edge effects tend to occur. To avoid this phenomenon, needle rollers are usually crowned.In this paper, the effect of the grinding undercut on the longitudinal pressure distribution of the needle rollers with Lundberg' s profile, which are used in the needle roller bearings with machined guide ribs,is disscussed. The analyses show that the width of grinding undercut must be considered in determining the crown drop of the needle rollers. It is a very important discovery in the study.Based on the Lundberg' s equation and the numerical calculation of three-dimensional elastic contact problems of finite length,a new numerical method for the crowm drop evaluation considered the effect of the grinding undercut is developed according to the discovery. The method used makes it possible to profile the needle rollers axially until the longitudinal pressure distribution is neither any "edge effects "nor high pressure concentration at the center. The method is useful as a guide to design not only the needle rollers, but also other rollers used in the roller bearings with the same kind of structure.