成敬敏1,2,李建文1,2,王洪忠1,2,王磊1,2,王慧辉1,2,李寒寒1,2

1.内燃机可靠性国家重点实验室,山东潍坊261061;2.潍柴动力股份有限公司，山东潍坊261061

摘要：针对发动机热冲击运行工况中冷却模块密封面存在的漏水风险，建立机体、冷却模块、螺栓、垫片的有限元模型，对冷却模块在热冲击工况中的密封性能进行仿真分析，研究螺栓数量及垫片材料对密封性能的影响。结果表明，增加螺栓数量时密封效果改进不明显，采用回弹性（补偿量）更大的不锈钢SUS301新垫片密封效果较好。经热冲击工况耐久试验考核，采用新垫片密封的发动机未出现漏水故障，为后续密封方式设计提供参考。

关键词：冷却模块；热冲击工况；补偿量；有限元分析

Abstract: Aiming at the risk of water leakage on the sealing surface of cooling module under the condition of engine thermal shock, the finite element model of engine block, cooling module, bolt and gasket are established. The sealing performance of cooling module under thermal shock condition is analyzed by simulation tool, and the influence of bolt quantity and gasket material on sealing performance is studied. The results show that the sealing effect of the method of increasing the number of bolts is not obvious, and the new gasket made of stainless steel SUS301 with greater resilience (compensation) has better sealing effect. After the thermal shock durability test, the engine with new gasket seal has no water leakage fault, which provides a reference for the subsequent seal design.

Keywords:cooling module；thermal shock condition；gasket；finite element analysis