摘要
燃气涡轮起动机返厂修理分解检查时,发现减速器输入主动齿轮损坏,弹性轴定位段单向严重胶合。通过对故障件进行外观形貌、裂纹和金相组织检查,以及齿轮偏斜情况下的强度计算分析,结果表明:主动齿轮断裂性质为轮齿弯曲疲劳,轮齿弯曲疲劳失效与其承受了较大的振动冲击载荷有关,弹性轴前花键与动力涡轮轴内花键间隙配合导致径向位移和涡轮转子振动增大,齿轮接触应力和弯曲应力显著增加,最终产生疲劳断齿。
When the gas turbine starter was returned to the plant for repair and decomposition inspection,it was found that the reducer input drive gear was damaged and the positioning section of the elastic shaft was seriously glued in one direction.Through macro and micro observation,microstructure examination,and stress calculation of gear in deflection,it is determined that the failure mode is tooth bending fatigue,which is related to the larger vibration and impact load.The clearance fit between the front spline of the elastic shaft and the internal spline of the dynamic turboshaft led to radial displacement and vibration increase of the turbine rotor.As a result,the contact stress and bending stress of the gear increased significantly,resulting in fatigue fracture of teeth.
作者
黄珍珍
滕旭东
符三华
HUANG Zhen-zhen;TENG Xu-dong;FU San-hua(AECC Changzhou Lanxiang Machinery Limited Liability Company,Jiangsu Changzhou 213002,China;The Ministry of Air Force Equipment Representative Office at Changzhou area,Jiangsu Changzhou 213002,China)
出处
《失效分析与预防》
2019年第6期410-414,共5页
Failure Analysis and Prevention
关键词
动齿轮
断齿
径向位移
弯曲疲劳
振动
driving gear
tooth fracture
radial displacement
bending fatigue
variation
