Research on Fault Analysis and Improvement of Plunger Assembly of Landing Gear Buffer Strut

Abstract

During the repair of landing gear buffer strut,it is found that the nut thread of plunger assembly is occluded and deformed.In order to study the cause of the fault,the fault tree of thread occlusion deformation fault is constructed according to the structural characteristics and working principle of plunger assembly.Based on historical test data,thread residual strength analysis and product condition inspection,the bottom events of the fault tree are analyzed,and carry out improvement research.The results show that the design defect of the nut and the failure to assemble the nut in place are the reasons for the bite deformation of the thread,and changing the pitch to 2 mm and using the double sleeve special tooling are of great significance to improve the residual strength of the thread and ensure the decomposition and assembly quality of the nut.

Keywords

• landing gear
• plunger assembly
• thread occlusion
• fault analysis
• residual strength