关键词: 侧门关闭力；密封胶条；泄压口

Abstract: In this paper, the issue of excessive closing force in a certain vehicle's side door is studied. Firstly, the factors influencing the door closing force are visualized using a fishbone diagram. The main influencing factors are experimentally validated to determine their contributions, identifying seal resistance and aerodynamic drag as the primary factors. Measures are formulated for these two factors, including adding exhaust vents and reducing compression load on the body-side and door- side seals, as well as increasing the area of the side panel's rear pressure relief port. Finally, after implementing these improvement measures, the door closing force successfully meets the improve- ment target, meanwhile a body measurement monitoring plan is established to focus on monitoring key characteristics and ensure the sustainability of the improvement effect.

Key words: Side door closing force; Weather strip; Pressure relief port