摘要
为分析整机体下主轴承-轴颈型线对润滑性能的影响,运用Reynolds流体润滑方程和Greenwood-Tripp微凸峰接触理论,计入轴颈倾斜和弹性变形的影响,建立基于柔性整机体的主轴承弹性流体动力润滑模型,通过仿真计算研究主轴承和轴颈型线对轴承润滑性能的影响。结果表明:相较于无型线和只考虑轴颈型线,同时考虑主轴承和轴颈型线下的主轴承最小油膜厚度明显增加,最大油膜压力减小,平均摩擦损失减小;同时考虑主轴承型线和轴颈型线时,在研究的范围内,随着轴颈倾斜角度的增加,主轴承的最小油膜厚度减小,最大油膜压力增加,平均摩擦损失减小;转速增加时,主轴承的最小油膜厚度增加,最大油膜压力减小,平均摩擦损失增加。因此在主轴承和轴颈型线设计时,需要考虑轴颈倾斜和工作转速2个因素。
To analyze the effect of main bearingjournal profiles on lubrication performance based on whole engine block,the Reynolds fluid lubrication equation and Greenwood-Tripp micropeak contact theory were used to establish the elastically hydrodynamic lubrication model of main bearing based on the flexible whole engine block.Considering the effect of journal misalignment and elastic deformation,the influence of main bearing and journal profile on bearing lubrication performance was studied by simulation.The results show that compared with the no profile and only considering the journal profile,the minimum oil film thickness of the main bearing considering main bearing and journal profiles increases significantly,the peak oil film pressure decreases,and the average friction loss decreases.When both the main bearing profile and journal profile are considered,within the scope of this study,with the increase of crankshaft misalignment angle,the minimum oil film thickness of the main bearing decreases,the peak oil film pressure increases,the average friction loss decreases.When the speed increases,the minimum oil film thickness of the main bearing increases,the peak oil film pressure decreases,the average friction loss increases.Therefore,the two factors of journal misalignment and working speed should be considered in the design of main bearing and journal profiles.
作者
李春建
赵俊生
朱桂香
李秀春
张国栋
陈冬冬
LI Chunjian;ZHAO Junsheng;ZHU Guixiang;LI Xiuchun;ZHANG Guodong;CHEN Dongdong(College of Mechanical Engineering,North University of China,Taiyuan Shanxi 030051,China;State Key Laboratory of Engine Reliability,Weichai Power Company Limited,Weifang Shandong 261061,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2021年第8期62-68,共7页
Lubrication Engineering
基金
内燃机可靠性国家重点实验室开放基金项目(SKLER⁃201903).
关键词
柔性整机体
主轴承-轴颈型线
轴颈倾斜
润滑性能
flexible whole engine block
main bearing⁃journal profiles
journal misalignment
lubrication performance