摩托车缸套表面激光微造型润滑特性数值分析

Numerical analysis of lubrication characteristics of laser texturing on motorcycle cylinder liner surface

为了研究改善摩托车发动机活塞环和缸套的摩擦性能、提高燃油经济性,采用激光表面微造型的方法,在缸套内表面加工出规则微观几何形貌。建立了均匀分布、球冠形状微造型的润滑理论模型,包括雷诺方程、油膜厚度方程、动力学方程等。使用多重网格数值方法进行编程求解,得出了活塞环与缸套间的流体动压和油膜厚度分布。仿真结果表明,在假设为平面的两个配合表面之间,表面微造型也能有效地产生流体动压效应,提高润滑性能。

In order to improve tribological property of motorcycle engine piston ring and cylinder liner and fuel economy characteristic, the technology of laser surface texturing was used to make regular micro geometric structure on the cylinder liner. The theoretical lubricating model of uniform distribution micro geometric structure in the form of micro pores was developed, including the Reynolds equation, oil-film thickness equation and dynamics equation. The model was solved by means of multigrid method and the hydrodynamic pressure and oil-film thickness distribution were obtained. The results show that surface texturing can be used to maintain hydrodynamic effects and improve the lubrication performance efficiently, even with nominal parallel surfaces.