摘要
内燃机工作中曲轴与轴承之间存在直接的相互作用,而目前曲轴轴承的润滑分析一般都是在摩擦学学科领域内,仅考虑轴承自身因素的影响。以曲轴—轴承系统为研究对象,进行计入曲轴受实际负荷作用产生变形的曲轴轴承润滑分析。分析中采用整体曲轴梁单元法计算曲轴变形和曲轴轴承负荷,采用变形矩阵法计算油膜压力作用下轴瓦表面的变形,采用动力学法计算轴承的轴心轨迹。结果表明,计入曲轴变形的影响时,轴承前后端面上轴心轨迹在局部位置有明显变化,某些时刻附近轴承最大油膜压力增加明显,绝大部分时间轴承最小油膜厚度有不同程度减小,轴承油膜压力的分布状况发生了变化,产生了偏布。
Direct interaction exists between crankshaft and bearing in internal combustion engine. However, present lubrication analysis of crankshaft bearing is limited in tribology aspect and only takes into account of bearing itself. In this paper, crankshaft-bearing system is taken as the research object, and the lubrication performance of crankshaft bearing considering crankshaft deformation under the actual load is analyzed. The crankshaft deformation and bearing load are calculated by the whole crankshaft beam-element method. The deformation of bearing surface under film pressure is calculated by deformation matrix method. The axes orbit of bearing is calculated by kinetics method. The results show that when taking into account of crankshaft deformation, the local axes center orbit on the front and back of bearing varies remarkably. The maximum film pressure of bearing increases greatly and the minimum film thickness of bearing reduces, leading to the change in film pressure profile of bearing.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2007年第3期258-264,共7页
Transactions of Csice
基金
国家自然科学基金资助项目(50175023
50575065)
关键词
内燃机
轴承
润滑
曲轴
变形
Internal combustion engine
Bearing
Lubrication
Crankshaft
Deformation
