某型燃油齿轮泵滑动轴承失效分析  

Analysis of Sliding Bearing Failure in a Fuel Gear Pump

作　　者：李凯 王博 杨雅婷 LI Kai;WANG Bo;YANG Yating(Troop 93170,Xi′an 710002,China;Design and Research Institute,AECC Xi′an Aeroengine Control Technology Co.,Ltd.,Xi′an 710077,China)

机构地区：[1]93170部队,西安710002 [2]中国航发西安航空动力控制有限公司设计研究所,西安710077

出　　处：《西安航空学院学报》2024年第5期1-7,共7页Journal of Xi’an Aeronautical Institute

摘　　要：为解决装配复合结构滑动轴承的某型号齿轮泵使用过程中出现的流量压力下降问题,首先,从故障零件形貌以及结构原理出发,指出滑动轴承铜-铝结合平面分离导致轴向过盈是齿轮泵端面轴承失效从而导致流量压力下降的原因,进而对滑动轴承零件进行结构受力平衡计算、最大静摩擦力测试以及仿真分析,揭示滑动轴承铜-铝结合平面分离的机理是由于工艺原因,铜-铝结合平面存在初始缝隙,齿轮泵工作时高压油进入缝隙,在液压力的作用下继续分离;然后,对不同工况下该型齿轮泵的失效概率进行评估,为外场产品使用提出建议;最后,根据失效机理对滑动轴承结构进行改进并完成试验验证,在源头上避免此类问题发生,为类似结构的滑动轴承结构设计提供参考。In order to solve the problem of flow pressure drop in a gear pump with a composite structure sliding bearing during its operation,this study initially examines the fault part morphology and structural principles to identify the cause of axial interference due to the separation of the copper-aluminum combined plane in the sliding bearing,leading to the failure of the end face bearing and consequently the decline in flow and pressure.Subsequently,structural force balance calculations,maximum static friction force tests,and simulation analyses are conducted on the sliding bearing components to reveal the mechanism behind the separation of the copper-aluminum combined plane.The separation is attributed to process-related causes,where an initial gap exists at the copper-aluminum combined plane,high-pressure oil enters this gap during the operation of the gear pump,causing further separation under the action of hydraulic pressure.Then,the failure probability of this type of gear pump under different working conditions is assessed to provide recommendations for the use of field products.Finally,based on the failure mechanism,the structure of the sliding bearing is improved and experimentally verified to prevent such issues at the source,offering a reference for the design of similar sliding bearing structures.

关 键 词：复合结构滑动轴承 液压力 最大静摩擦力 轴向过盈 

分 类 号：V232.2[航空宇航科学与技术—航空宇航推进理论与工程] V228.1