|
| 自集油涂层对凸轮-挺柱副限量润滑性能影响研究 |
| Study on the effect of Self-oil collection coating on the limited lubrication performance of cam-tappet pair |
| 关键词:凸轮-挺柱 润湿性梯度 限量供油 自集油增强 |
| Key Words:Cam-tappet Wettability gradient Limited oil supply Self-oil collection enhancement |
| 基金项目:国家自然科学基金(52005278) |
|
| 摘要:由于采用飞溅润滑或惯性甩油等原因,内燃机凸轮-挺柱副易出现润滑油供应不足,进而导致润滑失效。促使润滑表面限量润滑油最大程度供给到接触轨道,是改善润滑性能的有效途径之一。基于此,设计制备了一种图案化涂层功能表面,实现少量润滑油的自动聚集,探索了其对凸轮-挺柱副限量润滑性能的改善。结果表明,涂层功能表面导致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,提高了接触区供油进而实现润滑性能改善的目的。亲油轨道宽度对润滑油回流影响并非一致,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0.5 μL时运动副已处于严重乏油状态,集油表面亦无法发挥改善润滑效果。 |
| Abstract:Due to the use of splash lubrication or inertial oil dumping, the cam-tappet pair of an internal combustion engine is prone to insufficient lubricant supply, leading to lubrication failure. Encouraging the lubricating surface to supply a limited amount of lubricating oil to the contact track to the maximum extent is one of the effective ways to improve the lubrication performance. Based on this, a patterned coating functional surface was designed and prepared to realize the automatic accumulation of a small amount of lubricating oil, and its improvement in the limited lubrication performance of the cam-tappet pair was explored. The results show that the functional surface of the coating causes a wettability gradient on the contact surface, and a limited amount of lubricating oil flows in a directional manner without external force driving, which improves the oil supply in the contact area and thus improves the lubrication performance. The influence of the width of the lipophilic track on the return flow of lubricating oil is not uniform. Appropriate width design can produce a good oil collection effect; high-viscosity lubricating oil is impeded by the pinning effect and hinders its outward flow in the extrusion stage; when the oil supply volume is reduced to 0.5 μL the moving pair is severely starved of oil, and the oil collecting surface cannot improve lubrication. |
|
查看/发表评论 下载PDF阅读器 |
|
|
|