田身军，李德银，项大伟，齐少虎，张镇，昂亮

奇瑞汽车股份有限公司 动力系统技术中心，安徽芜湖241009

摘要：为解决集成排气歧管缸盖铸造工艺孔密封问题，研究密封孔应用环境，对比钢球、拉涨式堵头、丝堵、碗形塞等不同密封方案，从成本角度选取碗形塞密封；采用冲出压强对比试验，识别出影响碗形塞密封效果的关键因子并确定碗形塞的最优方案：材料为S304、过盈量为0.167～0.272 mm、压入深度应为2.5～3.5 mm，密封胶品为T48。多轮发动机台架和整车道路试验表明，碗形塞密封方案完全可以应用于高性能发动机缸盖水套、油道等处的密封。

关键词：发动机；集成排气歧管；缸盖；水套；碗形塞

Abstract: In order to solve the sealing problem of the holes used in casting process for cylinder head,considering the application conditions of the sealing holes, different sealing, such as steel ball, tension plug, screw plug and sealing cap, are investigated.The sealing cap is selected because of cost. By adopting the impulse strength contrast test, the key factors are recognized which affects the sealing of the sealing cap and the optimal plan is determined:the material is S304, the interference is 0.167~0.272 mm, the pressure depth is 2.5~3.5mm, and the sealant is T48. Based on the several round test of engine bench and vehicle road test, the sealing cap can be applied to the sealing of high performance engine cylinder head water jacket and oil channel.

Keywords:engine; integrated exhaust manifold; cylinder head; water jacket; sealing cap