空气涡轮起动机滚针轴承失效分析与改进研究

Failure analysis and improvement of air turbine starter needle roller bearing

以某型航空用空气涡轮起动机滚针轴承失效为例,运用金相分析和损伤检测等方法对其失效原因进行分析,发现轴承在运转过程中受到轴向力作用,使保持架出现轴向窜动,保持架端面与外圈端面接触摩擦,导致保持架承受过大的作用力,从而破碎。更换保持架材料和优化保持架结构,并对优化前、后的保持架进行仿真,结果表明,优化后的保持架强度远大于优化前,其运行可靠性更高。

Taking the needle bearing failure of an aviation air turbine starter as an example,the failure reasons are analyzed by means of metallographic analysis and damage detection.It is found that the bearing is subjected to axial force during operation,which causes the cage to move axially,and the end face of the cage is in contact with the end face of the outer ring,which leads to the cage being subjected to excessive force,thus breaking.The cage material is changed and the cage structure is optimized,and the cage before and after optimization is simulated.The results show that the strength of the optimized cage is much higher than that before optimization,and its operation reliability is higher.