关键词: 发动机盖；疲劳耐久；限位结构

Abstract: In this paper, through the research of sheet metal cracking, bump and other problems in the opening and closing durability test of the engine hood of a vehicle mode. The causes of the problems are analyzed systematically, the problem of insufficient limit of the engine hood cover is focused on, multiple solutions are proposed, and the feasibility of the scheme is verified by means of simulation analysis and test. At the same time, considering the cycle and input cost to solve the problem comprehensively, a low-cost scheme is proposed, that is the limit block adopts solid and optimized thread structure to solve the test problem. The research methods and conclusions of this paper have important guiding significance and engineering application value for similar problems in the design process of engine hood for various types of vehicles.

Key words: Engine hood; Fatigue durability; Limit structure