车辆发动机舱非金属零部件热老化寿命研究  

Research on Thermal Aging Life of Non-Metallic Components in Vehicle Engine Compartments

作　　者：欧阳俊 袁侠义 肖露 彭家燕 段炼 OUYANG Jun;YUAN Xiayi;XIAO Lu;PENG Jiayan;DUAN Lian(GAC Automotive Research&Development Center,Guangzhou 511434,China)

机构地区：[1]广州汽车集团股份有限公司汽车工程研究院,广州511434

出　　处：《汽车工程学报》2024年第5期888-897,共10页Chinese Journal of Automotive Engineering

摘　　要：热氧老化是发动机舱非金属零部件主要热失效模式之一,传统的整车热管理开发流程大多仅关注零部件的最高工作温度,不能有效地预测零部件生命周期内的热衰退表现。基于中国市场的气候条件和车辆道路行驶大数据,建立了一套整车热老化等效行驶工况和零部件热老化寿命评估方法。采用该方法对某车型发动机悬置橡胶衬套的热老化寿命进行了评估,发现改善橡胶材料的配方可以提高其热老化寿命至约3倍,悬置橡胶衬套的实际工作温度在原有基础上升高10℃,其热老化寿命减少约50.0%。对悬置橡胶衬套的传热路径进行了分析,发现可以通过优化冷却风扇尾流以及降低发动机本体与悬置橡胶衬套之间的热传导来改善橡胶衬套的实际工作温度,从而提高其热老化寿命。Thermal oxygen aging is one of the primary thermal failure modes for non-metallic components in the engine compartment.The traditional vehicle thermal management development process typically only focuses on the maximum working temperature of components,which is insufficient for effectively predicting the thermal degradation of these parts over their lifecycle.Based on China's climate conditions and extensive vehicle driving data,an equivalent thermal aging driving condition model is established to evaluate the thermal aging life of components.Using this method,the thermal aging life of an engine mount rubber bushing is evaluated.It is found that improving the rubber material formula increases its thermal aging life by approximately 3 times.However,if the operating temperature of the rubber bushing increases by 10℃,its thermal aging life decreases by about 50.0%.In addition,an analysis of the heat transfer path of the rubber bushing shows that its actual working temperature can be lowered by optimizing the fan wake and reducing heat conduction between the engine and the rubber bushing,thereby improving its thermal aging life.

关 键 词：发动机舱 热老化寿命 等效行驶工况 温度分布 热衰退 

分 类 号：U461.7[机械工程—车辆工程]