发动机工况对缸盖低周疲劳影响分析与研究  

Analysis and Research on the Influence of Engine Condition on Low Cycle Fatigue of Cylinder Head

作　　者：张福明 路明 郝佳胜 Zhang Fu-ming;Lu Ming;Hao Jia-sheng(Ningbo Geely Royal Engine Components Co.,Ltd Ningbo 315336,China)

机构地区：[1]宁波吉利罗佑发动机零部件有限公司,浙江宁波315336

出　　处：《内燃机与配件》2023年第4期49-51,共3页Internal Combustion Engine & Parts

摘　　要：现有的台架试验工况不能完全验证发动机在整车上的故障,如缸垫处渗水,渗油等。为了在台架上充分验证失效模式,因此需要对冷热冲击工况进行强化,使其变得更为严苛,以此来满足可靠性的要求。试验结果表明在发动机工况转换过程中,通过缩短冷、热水转换时间,控制冷却液的升温速率和降温速率,可以达到强化试验工况的目的。同时也要考虑试验工况变化后对缸盖低周疲劳的影响,本文通过有限元分析的方法对比两种试验工况对缸盖低周疲劳的影响,仿真结果表明强化后的试验工况对缸盖低周疲劳影响非常有限,缸盖鼻梁区和火花塞孔周围无开裂风险。The existing bench test conditions can not fully verify the engine faults on the whole vehicle, such as water leakage at cylinder pad, oil leakage, etc. In order to fully verify the failure mode on the bench, it is necessary to strengthen the hot and cold shock conditions to make them more severe, so as to meet the reliability requirements. The test results show that the test conditions can be strengthened by shortening the conversion time between cold and hot water and controlling the heating rate and cooling rate of the coolant. Testing condition changes at the same time also want to consider the influence of the cylinder head low cycle fatigue, this paper, by means of finite element analysis, compare the two influence on cylinder head low cycle fatigue test conditions, the simulation results show that improved after the test conditions have very limited influence on cylinder head low cycle fatigue, cylinder head bridge of the nose area and around the spark plug hole without risk of cracking.

关 键 词：密封 渗漏 低周疲劳 冷热冲击 燃烧室 

分 类 号：U463.132[机械工程—车辆工程]