| 摘要:针对某柴油机连杆大端底孔失圆问题，从连杆刚度、连杆与连杆螺栓材料、装配润滑剂选择及运行状态等几方面进行分析。结果表明:润滑剂选择不当导致拧紧过程中连杆螺栓与大端盖贴合面拉毛，摩擦系数增大，装配预紧力与加工预紧力不一致，最终导致底孔失圆。更换润滑剂后，该问题得到解决。 |
| 关键词: 连杆，大端底孔 失圆 摩擦系数 润滑剂 |
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| Analysis and Solutions of Out-of-Circle of Big End Borefor Diesel Engine Connecting Rod |
| Jiao Yafei,Xu Congcong,Wu Limin,Zhao Jiahui,Liu Kai |
| Shanghai Marine Diesel Engine Research Institute，Shanghai 201108 |
| Abstract:A diesel engine connecting rod was studied as its big end bore was out-of-circle. The analysis was carried out from the aspects of stiffness of the connecting rod, the material of the connecting rod and bolts, selection of lubricant and operation state of the diesel engine. The analysis result shows that wrong selection of the lubricant caused damage of the contacting surface of bolts and big end cap, the friction coefficient increased, thus the assembly preload is inconsistent with the machining preload, which resulted in out-of-circle of big end bore. After changing proper lubricant, the problem was solved. |
| Key words: connecting rod big end bore out-of-circle friction coefficient lubricant |
