国产汽车链的多冲特性及失效机理研究

通过试验与分析,研究了汽车发动机正时链的多冲特性、失效机理以及销轴、套筒和滚子等元件摩擦表面的磨损形貌特征.结果表明,汽车发动机正时链的主要磨损机制是疲劳磨损,销轴、套筒零件表面的裂纹生成、扩展与剥落是其主要磨损失效机理.保证滚子零件具有足够的强度与塑性,并采用合理的成形工艺,是提高滚子零件多冲抗力的有效方法.

Study on the Failure Mechanism and Multi-Impact Property of Domestic Automotive Engine Chain

In the paper, we studied the failure mechanism of the au tomotive engine timing chain as well as the worn surface morphology of the rubbi ng pair of bush and pin and roller by analysis and test. The results shown that the main wear mechanism of automotive engine chain was form, extend and flaking of crack for top layer of pin and bush. The effective methods of increasing resi stance to multi-impact for roller were to ensure that the roller has sufficient strength and plasticity and to adopt suitable shaped techniques.