商用车发动机配气机构中的凸轮-滚轮摩擦副属于高副接触，工作中经常发生表面磨损失效。一方面，在弹流润滑状态下，凸轮-滚轮表面承受极高的油膜压力和交变载荷，容易产生疲劳磨损；另一方面，由于局部微凸体接触和滑动摩擦的存在，凸轮-滚轮之间会发生磨粒磨损，尤其是在打滑状态下。传统研究中一般通过发动机耐久试验来考察凸轮-滚轮副的磨损可靠性，但时间和经济成本非常高。本研究基于凸轮-滚轮副的混合热弹流润滑和磨损过程耦合建模，提出了凸轮-滚轮副的磨损演化预测方法，实现了在累计工况历程下的凸轮-滚轮磨损量预测。通过2 000 h发动机台架耐久试验发现，凸轮-滚轮的磨损演化预测结果与试验结果高度吻合，证明提出的方法具有替代高成本的耐久试验并预测凸轮滚轮磨损寿命的潜力。

The cam-roller friction pair in the valve train of commercial vehicle engines belongs to high contact pairs, and surface wear failure often occurs during operation. On the one hand, under the elastohydrodynamic lubrication state, the surface of cam-roller bears extremely high oil film pressure and alternating loads, which makes it susceptible to fatigue wear. On the other hand, due to the presence of localized micro-protrusion contact and sliding friction, abrasive wear occurs between the cam and roller, especially in a slipping state. Traditional research typically evaluates the wear reliability of cam-roller pair through engine endurance testing, which is highly time-consuming and costly. Therefore, based on the coupling modeling of mixed thermal elastohydrodynamic lubrication and wear process of cam-roller pair, a wear evolution prediction method for cam-roller pair was proposed, which realized the prediction of cam-roller wear depth under cumulative working conditions. Through a 2 000 h engine bench durability test, it was found that the predicted wear evolution of the cam-roller pair was highly consistent with the experimental results, proving that the proposed method had the potential to replace high-cost durability tests and predict the wear life of cam-roller.