Abstract: The plastic filler cap is mainly to protect the refueling port. When the car is refueling, the plastic filler cap should be able to open and close smoothly.It has a high opening and closing frequency. In order to improve the user's perceived quality, its stiffness is required to be correspondingly high. This paper through the rigidity analysis and research of a development model, based on the stiffness is quite good and size of the similar product structure, material properties, dimensions and numerical analysis, a development model in standard that plate thickness and the height of the gooseneck is too small, cause the stiffness is weak. CAE analysis is used to verify that thickening thickness of hinge plate and hoisting gooseneck height have better effect on stiffness improvement. Finally, the test results show that the design objectives meet the requirements, and the user perception of quality is good. To sum up, the calibration analysis and optimization data from the perspective of forward development can avoid the improvement of mold after mold opening, prolongthe development cycle and increase the cost of mold modification.

Key words: Plastic filler cap; Stiffness analysis; CAE; Optimization design

摘要： 汽车塑料加油口盖以保护加油口为主，在汽车加油时，加油口盖总成要能顺利开启和 关闭。由于加油口盖开关频率较高，为提升用户感知质量，对其刚度要求也相应较高。文章 通过对某开发车型塑料加油口盖刚度进行研究，对刚度良好且尺寸相当的同类产品其结构组 成、材料属性、轮廓尺寸以及关键间隙匹配数值进行分析，对标显示某开发车型加油口盖铰 链板厚度和鹅颈高度过小，导致整体刚度较弱。得到初步的改善方案后，借助计算机辅助工 程（CAE）手段验证方案有效性，得出加厚铰链板厚度和增大鹅颈高度均对刚度有较好的提 升效果。最终，到实车阶段的刚度试验结果显示满足设计目标要求，用户感知品质良好。综 上，从正向开发的角度对标分析和优化数据，避免开模后修模改善延长开发周期以及增加改 模费用。

关键词: 塑料加油口盖；刚度分析；CAE；优化设计