十字节密封圈结构失效模式及其优化研究

Failure mode and its optimization on structure of cross joint sealing ring

某型号的十字节装运输车做耐久试验进行到70 h时,十字节密封圈开始漏油。针对这一问题,对十字节密封圈的失效模式进行了研究,对其结构参数进行了优化设计。首先,通过对比试验前、后密封圈唇口轮廓曲线,对十字节密封圈的失效原因进行了分析,从而确认了漏油原因;然后,以唇口的应力、温度和径向变形为目标值,对密封圈的结构参数(唇口的接触形式、接触角度、唇厚度和过盈量)进行了规律性研究,得到了各参数最优的取值范围;以唇口的应力和温度为目标值,对唇厚度和过盈量进行了极差分析,得到了各参数的贡献度;最后,根据研究内容确定了优化方向,完成了新结构的设计,并选了3组试制样件进行了试验,对优化后结构的密封性能进行了验证。研究结果表明;耐久试验进行100 h后,优化后的密封圈漏油量均小于1 g,满足试验标准,并解决了漏油问题;该研究可用于解决十字节密封圈的设计和优化问题。

The cross joint sealing ring began to leak when the durability test of a certain type of cross joint loaded transport vehicle was lasted for 70 hours.Aiming at this problem,the failure mode and structural parameters of the cross joint sealing ring were studied.Firstly,by comparing the lip contour curves of the sealing ring before and after the test,the failure reason of the sealing ring was analyzed to identify the cause of oil leakage of the cross joint sealing ring.Then,taking the stress,the temperature and radial deformation of the lip as the target values,the structural parameters of the sealing ring,such as the contact form,contact angle,lip thickness and interference were studied regularly to obtain the optimal value range of each parameter.Taking the stress and temperature of the lip as the target values,the range analysis of lip thickness and interference were carried out to obtain their contribution degree.Finally,the optimization direction was confirmed and the new structure was designed according to the research content.At the same time,three groups of samples were selected for experimental verification.The results show that the oil leakage of the optimized sealing ring is less than 1 g after 100 hours,which meet the test standard and solved the oil leakage problem.Meanwhile,it also indicates that the research can be used to solve the design and optimization problems of the cross joint sealing ring.