【摘要】 在汽车发动机正时链系统工作性能试验中,通过对链条滚子、套筒、销轴等表面SEM形貌失效分析,发现在间隙配合的中链板与销轴之间的工作结合面出现了细小的皱纹,而同一销轴两端与两个外链板过盈配合的结合面却不存在这种现象。这种接触表面的形成,是位移在纳米条件下,并且在垂直交变载荷与表面切向力的合力所导致的结果,最终导致配合面的微小变形。这表明微动磨损在纳米级别的微动磨损初期应首先是表面的晶界变形,而不一定微动磨损的结果就是接触表面的破坏。这种大面积接触的微动不同于一般小面积接触的微动,试验中出现的微动磨损现象也是纳米摩擦学中的另一典型的初期特征。更多还原

【Abstract】 In the test of the quality of automobile engine timing chain,the surface of rollers and pins and sleeves was analyzed with SEM and the fine furrows was found in the middle plate and pin connected untightly parts but no this phenomenon in the tightly connect of the pin two end.It is showed that the fine furrows are formed by nanometer displacement and alternating tangent load and radial load at the same time,then the minuteness displacement appears in the parts surface.In the preliminary stage of nanometer fritting wear,it is the crystal boundary migration of the parts surface but not breaking away on the parts surface.This phenomenon only appears on the large connect surface of parts.This character of fritting wear is primary character of nanotribology.更多还原