石小明,刘维娟,刘世英,郑永刚,王奇峰

（山东滨州渤海活塞股份有限公司 滨州256602）

摘要：针对某发动机活塞在实验中出现的活塞销孔表面微观划痕的现象，通过对销孔表面承载和混合润滑模型的分析以及对活塞销孔表面化学处理后效果的对比，得出该活塞出现微观划痕的根本原因，并据此对活塞及其化学处理方式进行了优化。优化后的活塞顺利通过发动机试验的考核。

关键词：内燃机；活塞；销孔；微观划痕；优化

  Abstract: For the micro-scratches appearing on the piston pin bore surface in an engine test, the paper finds out the reason after analyzing the load on the pin bore surface and the mixed lubrication model and comparing the results of chemistry treatment, and then optimizes the chemical treatment mode.  The optimized pistons work well in the engine test.

   Keywords: Engine; Piston; Pin Bore; Micro-Scratch; Improvement