自集油涂层对凸轮–挺柱副限量润滑性能影响研究

Study on the Effects of Self-Oil Collection Coating on the Limited Lubrication Performance of Cam-Tappet Pairs

设计制备了一种圆弧形疏油区与原始亲油区交替排列的图案化功能表面,实现少量润滑油的自动聚集,探索其对凸轮–挺柱副限量润滑性能的改善。结果表明,涂层功能表面使接触副表面产生润湿性梯度,限量润滑油在无外部力驱动情况下定向流动,改善了接触区供油进而实现改善润滑性能的目的。亲油轨道宽度对润滑油回流影响并非一致的,合适的宽度设计能够产生良好的集油效果;高黏度润滑油受到钉扎作用阻碍其挤压阶段的向外流动;供油量降低至0.5μL时运动副已处于严重乏油状态,集油表面无法发挥改善润滑的作用。

A patterned functional surface with arc-shaped oleophobic zones alternating with the original oleophilic zones was designed and prepared to achieve automatic aggregation of a small amount of lubricant and to explore the improvement of limited lubrication performance on the cam–tappet sub-surface.The results show that the coated functional surface leads to a wettability gradient on the surface of the cam–tappet sub-surface,limiting the directional flow of the lubricant without external force,increasing the oil supply amount to the contact area and thus improving the lubrication performance.The effects of oleophilic track width on lubricant return are not uniform,and a suitable width design can produce a good oil collection effect.The high viscosity lubricant is hindered by the pinning effect to flow outward during the extrusion stage.The moving parts are in a serious oil-shortage state when the oil supply amount is reduced to 0.5μL,and the oil collection surface cannot play a role in improving the lubrication effect.