随着内燃机功率密度的提升和对轻量化设计要求的提高，连杆大端轴瓦在承受较大的交变载荷以及振动附加载荷后其过盈接触面容易发生微动磨损，严重影响内燃机使用寿命和可靠性。针对一款内燃机的连杆大端轴瓦，在实际的装配条件和载荷特征下开展微动磨损加速试验，并建立相应的微动计算模型进行应力及磨损分布规律研究。结果表明：模型和试验结果较好吻合，连杆杆身大端表面应力在最大压载下由中间向两侧衰减，最大拉载下分布相反；大端轴瓦微动磨损程度要大于大端盖轴瓦，轴瓦边缘部分磨损程度要高于中心部分。且磨损越严重，磨损后的表面粗糙度越大。

With the increase of power density and lightweight design requirements for internal combustion engine, the interference contact surface of connecting rod big end bearing bush was prone to fretting wear after bearing large alternating load and vibration additional load, which seriously affected the service life and reliability. Based on the connecting rod big end bearing bush of an internal combustion engine, the fretting wear acceleration experiment was carried out under the actual assembly conditions and load characteristics, and the corresponding fretting calculation model was established to study the distribution laws of stress and wear. The results show that the model is in good agreement with the experimental results. The surface stress at the big end of connecting rod body decreases from the middle to both sides under the maximum holding load and in the opposite direction under the maximum tensile load. The fretting wear degree of big end bearing bush is more severe than that of big end cover bearing bush, and the wear degree of edge is more severe than that of center for the bearing bush. In addition, the more severe wear will lead to the greater surface roughness.