Papers by Author: Jing Hu Ji

Abstract: This paper presents a numerical study of the effects of surface structure geometrical parameters on the tribological performance of a laser surface textured mechanical seal. Seal performance such as seal clearance which is corresponding to hydrodynamic effect and friction torque is calculated for a range of sealed pressures, dimples area density and dimple depth over dimple diameter ratio. The results indicated that laser surface textured mechanical seals substantially improve the tribological performance in the lower sealed pressure than in high pressure. Area density of dimples has little effect on the tribological performance, however, dimple depth over dimple diameter ratio has significant effect on the tribological performance.

Abstract: The laser honing technique is a new surface texturing technique. As the piston ring at the top or lower oil attachment point works under worse lubrication condition, its wear increases severely, laser texturing was used to the piston ring/liner, lineary extending grooves and regular arranged dimples with predetermined parameters was well-matched with the needs of lubrication. The effects of different dimple shapes, such as sphere coronal, combined sphere coronal ,columnar, hexahedral, and trapezoidal dimples was analyzed by the theory of hydrodynamic lubrication. It was deduced that trapezoidal dimples are fit for only single running orientation and sphere coronal and combined sphere coronal dimples are fit for double running orientations. The experimental researches show that laser texturing not only can reduce the oil consumption and the cost of engine but also can prolong its work life.