倾斜轴颈轴向运动对粗糙表面径向滑动轴承润滑性能的影响研究

Influence of the Axial Movement of Misaligned Journal on Lubrication Performance of Journal Bearing with Rough Surface

通常对轴-径向滑动轴承进行润滑分析时,均忽略多种因素综合作用下轴颈沿轴承轴线方向的运动状况,与轴-轴承系统中轴承的实际工作状况存在较大差异。以轴-轴承系统为研究对象,综合考虑轴颈轴向运动、表面形貌和轴颈倾斜,基于平均Reynolds方程,建立了耦合轴颈轴向运动的粗糙表面径向滑动轴承润滑模型,主要探讨分析轴颈轴向运动对粗糙表面倾斜轴颈轴承润滑特性的影响。结果表明:倾斜轴颈轴向运动对粗糙表面径向滑动轴承润滑特性影响显著;与不考虑滑动表面粗糙度相比,考虑滑动表面粗糙度时轴颈轴向运动对轴承润滑特性的影响程度有所降低;轴颈轴向速度越小,滑动表面粗糙度对轴承最大油膜压力、承载力和稳定工作力矩影响越大;轴颈轴向速度越小,粗糙度模式对轴承润滑特性影响越显著。因此,对粗糙表面倾斜轴颈径向滑动轴承进行润滑分析考虑轴颈轴向运动的影响是非常必要的。

At present, the axial movement of journal which moves along the axis direction of journal bearing under the combined action of various factors is ignored in the lubrication analysis of journal bearing, which has a big difference from the actual working condition of bearing in the shaft-bearing system. The shaft-bearing system is taken as the research object. With a comprehensive consideration of the axial movement of journal, the surface topography and the misaligned journal, a new lubrication model of journal bearing is established based on average Reynolds equation. The influence of the axial movement of journal on the lubrication characteristics of misaligned journal bearing with a rough surface is analyzed mainly. The results show that the axial movement of misaligned journal has a significant effect on lubrication characteristics of journal bearing. Comparing by, the influence of axial movement on lubrication characteristics of bearing is reduced when the rough surface of sliding surface is considered. The smaller the axial velocity of journal, the greater the influence of surface roughness on the maximum oil film pressure, load-carrying capacity, and overturning moment of journal bearing. The smaller the axial velocity, the more significant the influence of Peklenik parameter on lubrication characteristics. Therefore, it is necessary to consider the influence of the axial movement of journal in the lubrication analysis of misaligned journal bearings with a rough surface.