某航空发动机星形轮系减速器齿轮偏载剥落故障分析与改进

Analysis and Improvement for Failures of Gear Partial Load Spalling of an Aero-engine Star Gearbox Reduction Drive

针对某航空发动机星形轮系减速器持久试车过程中齿轮偏载剥落故障,从设计、制造及试验等方面分析了造成故障的原因,确定了发动机空气系统设计不合理、齿轮轮齿修形参数不合理是导致故障的主要原因,减速器机匣轴承座孔配合设计不合理是导致故障的次要原因。通过对故障机理进行分析,采取在减速器输入机匣外壁增加冷却流路设计、调整减速器轴承座孔配合、优化齿轮轮齿修形参数的改进措施,并经试验验证,排除了本次故障。本次故障可为同类星形轮系减速器的设计和故障分析提供借鉴。

Aimed at the fault that the gear partial load spalling during the fatigue testing of an aero-engine star gearbox reduction drive,and from respects such as design,manufacturing and test and so on,we analyzed the cause of the fault.The main causes were identified that unreasonable design of the engine air system and gear tooth modification parameters,and unreasonable design of the fit of the gearbox bearing seat hole was the secondary cause of the fault.By analyzing the mechanism of fault,the failure was removed through corresponding improved measurements including adding a cooling flow path on the outer wall of the gearbox input,adjusting the fit of the gearbox bearing seat hole,and optimizing the gear tooth profile parameters,which was verified by experiment.This research provided a reference for the design and failure analysis of the similar star gearbox reduction drive.