关键词: 车门封板；水密性分析；漏水现象；落水机理

Abstract: Door cover is an important sealing component installed on the assembly hole of window lifter. Its main function is to isolate the dry and wet areas of inner panel and prevent water and dust from entering the passenger compartment or damaging electronic components. The assembly holes of window lifter are different among different automobile models, but the connection position of door cover is standard cross-section. Taking a certain automobile model as an example, in view of the problem of door cover leakage problem during water management experiment is studied. Deeply analyzes the water falling mechanism and production quality factors that may cause water leakage of cover and and formulates structural measure for the cover cross-section. The results show that bigger gap of window slot can result in insufficient overlap between outer strip and glass. Exceeding the tolerance of inner panel planeness will lead to insufficient overlap between sheet metal and cover lip. Smaller edge fold height of inner panel or significant size fluctuation will cause gap in connection position. If these production quality factors are not properly controlled, they will increase the risk of water leakage. Increasing the thickness of the upper edge wall of cover to fit the flange can reduce the amount of water entering the upper cavity. Adding drainage hole on the inner panel can effectively divert the water in the cavity lower edge of cover. Designing structural reinforcement along the lower edge of cover can enhance the support between the lower edge of cover and inner panel, reducing the risk of water leakage. Finally, the effectiveness of production quality control and structural optimization is verified via water management experiment, providing technical reference for the analysis and solution of such engineering problems in the future.

Key words: door cover; water tightness analysis; water leakage phenomenon; water falling mechanism