增压发动机排气管前端法兰结合面高温密封问题研究  

Research on High Temperature Sealing Problem of Flange Surface of Exhaust Pipe Front End of Supercharged Engine

作　　者：武斌 蔡存朋 曹正林 李康 沈宇航 谢晓峰 Wu Bin;Cai Cunpeng;Cao Zhenglin;Li Kang;Shen Yuhang;Xie Xiaofeng(General Research and Development Institute,China FAW Co.,Ltd.,Changchun 130013;State Key Laboratory of Comprehensive Technology on Automobile Vibration and Noise&Safety Control,Changchun 130013)

机构地区：[1]中国第一汽车股份有限公司研发总院,长春130013 [2]汽车振动噪声与安全控制综合技术国家重点实验室,长春130013

出　　处：《汽车工艺与材料》2021年第10期7-11,共5页Automobile Technology & Material

摘　　要：针对某直喷增压发动机排气管前端法兰与增压器法兰结合面漏气问题,通过数字化CAE仿真手段,复现法兰结合面在发动机工作时的变形情况和金属垫片密封情况,发现漏气的真实原因,即高温、法兰结合面挤压变形双重作用导致垫片密封环凸筋结构被破坏。开展法兰结合面密封性能优化研究,得到最经济的结构改进方案,使法兰结合面对垫片的挤压变形降低46%,一次通过发动机冷热冲击试验验证,解决漏气问题。Gas leaks at the joint surface of the flange of the exhaust pipe front end and the flange of the turbocharger of a direct injection supercharged engine.To find the real cause of leakage,digital CAE simulation is used to reproduce deformation of the flange surface and sealing of the metal gasket of the engine when the engine is working,and it is found that the dual effects of high temperature and extrusion deformation of flange joint surface damage the rib structure of gasket seal ring.Optimization study is made to the sealing performance of flange joint surface,and the most economical structural improvement scheme is obtained,which reduces the extrusion deformation of gasket caused by flange joint surface by 46%.This scheme is verified by engine thermal shock test at one time to solve the gas leakage problem.

关 键 词：密封 CAE 仿真 法兰结合面 金属垫片 高温 挤压变形 

分 类 号：U464.132[机械工程—车辆工程]