摘要
针对某型号增压柴油发动机在台架耐久试验过程中,多次出现缸盖与排气歧管结合面漏气问题,从金属凸筋垫片的密封原理角度对失效件进行结构化分析。在问题排查过程中,借助计算机辅助工程(CAE)仿真方法分析密封部件在装配及工作状态下的接触应力,并与FUJI面压试验测试结果进行对比,确定CAE仿真模型的准确性。通过降低排气歧管垫片的表面摩擦系数,以及增加排气歧管双头螺柱长度的方式,实现了排气歧管密封功能的优化。优化后的方案通过了台架耐久试验考核。
During the bench durability test of a supercharged diesel engine, the problem of air leakage at the joint surface of cylinder head and exhaust manifold occurred many times. Based on the sealing principle of metal ribbed gasket, the structural analysis of the test failure parts was carried out. In the process of troubleshooting, CAE simulation method is used to analyze the contact stress under assembly and working conditions, and compared with FUJI pressure test results to determine the accuracy of CAE simulation model. Finally, the sealing function of the exhaust manifold is optimized by reducing the surface friction coefficient of the exhaust manifold gasket and increasing the length of the exhaust manifold studs. The optimized scheme finally passed the examination of bench durability test.
作者
王晓东
李磊
陆树一
WANG Xiaodong;LI Lei;LU Shuyi(Commercial Vehicle Technology Center,SAIC Motor Co.,Ltd.,Shanghai 200438,China;Shanghai New Power Automotive Technology Co.,Ltd.,Shanghai 200438,China)
出处
《柴油机设计与制造》
2022年第3期33-37,共5页
Design and Manufacture of Diesel Engine
