关键词: 塑料加油口门总成；执行器；开闭耐久；开启失效；优化措施

Abstract: Aiming at the opening failure of the fuel filler door assembly in the opening and closing durability process of a certain model, through physical inspection and dimensional chain analysis, the failure cause is the deformation of actuator base, which leads to the out-of-tolerance of parts. At the same time, through the disassembly of the faulty parts, it is found that there are scratches and wear between the internal components which results in the mechanism stuck on the operation process unable to operate. Through optimization measures such as mold anti-deformation optimization, strengthening process control and adjustment of matching relationship between components and other improvement measures, the precision of the actuator base is improved normal function and the opening and closing endurance test of actuator and fuel filler assembly passed smoothly. So as it proves that the improvement measures are effective and provide a reference for the follow-up projects.

Key words: Plastic fuel filler door assembly; Actuator; On and off durability; Operating failure; Optimization measure