主起落架收放作动筒密封失效研究  

Study on Seal Failure of the Main Landing Gear Retraction Actuator

作　　者：孙同明 周雅兰 SUN Tongming;ZHOU Yalan(National Wuhu Machine Factory,Wuhu 241007,China)

机构地区：[1]国营芜湖机械厂,安徽芜湖241007

出　　处：《机械工程师》2024年第12期146-148,共3页Mechanical Engineer

摘　　要：某型飞机主起落架收放作动筒用于飞机起飞着陆时收放起落架,在产品使用过程中作动筒前端出现渗油,内部密封失效。对分解的零部件进行分析,失效原因如下:活塞杆偏磨、过度压缩密封圈形成较大且分布不均匀的压力、活塞杆表面较大且周向不均匀分布的摩擦力综合作用下导致密封圈工作时四周受力不均,工作时出现拧扭和断裂现象,从而作动筒端部出现渗油。在产品加工与修理过程中应当注意活塞杆表面粗糙度,密封圈等密封材料无缺陷,保证作动筒的密封性。A certain type of aircraft main landing gear retraction actuator is used to retract the landing gear during takeoff and landing.During the use of the product,oil leakage occurrs at the front end of the actuator cylinder and the internal seal fails.Analysis of the decomposed parts shows the following reasons:piston rod grinding,excessive compression of the seal to form a large and uneven distribution of pressure,the piston rod surface is large and uneven distribution of friction in the circumferential direction of the combined effect,resulting in uneven force around the sealing ring,then twisting and fracture phenomenon occurs,which leads to oil leakage of the end of the actuator cylinder.In the product processing and repair process,attention should be paid to the piston rod surface roughness and sealing ring defects,then the sealing of the actuator cylinder can be ensured.

关 键 词：主起落架 收放作动筒 活塞杆 密封失效 

分 类 号：V267[航空宇航科学与技术—航空宇航制造工程]