滑油泵转轴断裂原因分析、改进及验证  

Cause Analysis,Improvement and Verification of a Lubricating Oil Pump Shaft Fracture

作　　者：白高阳 张龙 叶辰 李政 BAI Gao-yang;ZHANG Long;YE Chen;LI Zheng(Xinxiang Aviation Industry(Group)Co.,Ltd.,Xinxiang 453000,China)

机构地区：[1]新乡航空工业(集团)有限公司,河南新乡453000

出　　处：《液压气动与密封》2024年第12期105-111,共7页Hydraulics Pneumatics & Seals

摘　　要：根据某航空发动机滑油系统滑油泵增压级转轴断裂发生故障,通过仿真、宏观检查、微观电镜扫描方法分析,得出转轴断裂的主要原因是转轴疲劳寿命设计不足,以及转轴加工过程中产生的重熔层诱发了裂纹产生,导致转轴在随发动机工作时产生了断裂故障。采用仿真手段对改进前转轴的疲劳寿命进行了分析,结果表明,改进前转轴的设计疲劳寿命仅为2.89 h,改进结构后转轴的仿真寿命为6830 h,满足要求。改进后产品通过了场内3000 h、场外2000 h寿命试验验证,表明改进措施有效,可以解决滑油泵增压级转轴断裂问题。Based on the failure of a certain aircraft engine lubrication system's oil pump booster stage shaft due to fracture,analysis through simulation,macroscopic inspection,and micro-electron scanning methods revealed that the primary cause of the shaft fracture was insufficient design of the shaft's fatigue life,as well as the presence of a re-melt layer formed during the shaft manufacturing process,which induced crack formation and led to shaft fracture during engine operation.Simulation methods were used to analyze the fatigue life of the pre-improvement shaft,and the results indicated that the design fatigue life of the pre-improvement shaft was only 2.89 hours.After structural improvements,the simulated life of the shaft was 6830 hours,meeting the requirements.The improved product passed both in-field 3000-hour and off-field 2000-hour life tests,demonstrating that the improvement measures were effective and could resolve the issue of shaft fracture in the oil pump booster stage.

关 键 词：转轴断裂 电解加工 仿真 强度校核 

分 类 号：TH137[机械工程—机械制造及自动化]