| 孙思聪,杨欣,周建明,等.往复式发动机活塞销–衬套的润滑特性研究[J].内燃机工程,2023,44(3):17-23. |
| 往复式发动机活塞销–衬套的润滑特性研究 |
| Research on the Lubrication Characteristics of Piston Pin–Bushings in Reciprocating Engines |
| DOI：10.13949/j.cnki.nrjgc.2023.03.003 |
| 关键词:往复式发动机 活塞销–衬套 摩擦学 动力学 润滑 |
| Key Words:reciprocating engine piston pin–bushing tribology dynamics lubrication |
| 基金项目:国家自然科学基金面上项目（52271328） |
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| 摘要:针对试验对象与活塞销–衬套润滑机理不一致的问题，以一种新型发动机活塞销–衬套试验台为对象，建立了耦合摩擦学特性的动力学模型，基于试验验证的模型对比分析了不同间隙和粗糙度对润滑性能的影响。结果表明：一定范围内增加活塞销–衬套的间隙，整体上增加了液动润滑的占比，局部的最小油膜厚度减薄，液动润滑产生的摩擦功耗增加，粗糙接触产生的摩擦功耗下降。随着表面粗糙度增加，连杆小端载荷中粗糙接触的占比增加，最小油膜厚度的变化不大，但平均油膜厚度有较大增加，平均膜厚比亦稍有增加，但最小膜厚比下降，液动润滑产生的摩擦功耗微幅降低，粗糙接触产生的摩擦功耗升高明显。 |
| Abstract:To address the problem of lubrication mechanism inconsistency between the test rig and the piston pin–bushing， a dynamical model coupling tribological characteristics with a novel engine piston pin–bushing test rig was established， and the effects of the different clearances and the roughness on the lubrication performance based on the experimentally validated model was comparatively analyzed. The results showed that increasing the piston pin–bushing clearance within a moderate range increases the overall percentage of hydrodynamic lubrication， thins the local minimum oil film thickness， increases the frictional power consumption generated by hydrodynamic lubrication， and decreases the frictional power consumption generated by asperity contact. As the roughness of the piston–pin bushing surface increases， the asperity contact ratio also increases， the minimum film thickness does not change much， but the average film thickness increase a lot. The average film thickness ratio also slightly increases， but the minimum film thickness ratio decreases. The frictional power consumption of hydrodynamic lubrication slightly decreases， and the frictional power consumption of asperity contact increases significantly. |
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