聚醚醚酮（polyetheretherketone，PEEK）齿轮是高性能聚合物齿轮，广泛应用于汽车、无人机、机器人等领域。然而PEEK齿轮失效的形式和机理复杂，导致其在动力传动场合应用缺乏合理的设计依据。针对PEEK齿轮失效机理不明和基础数据缺失的问题，开展了喷油润滑下PEEK斜齿轮疲劳性能试验，计算了PEEK齿轮接触和弯曲应力，并通过扫描电镜等设备进行了失效表征。发现喷油润滑下PEEK齿轮失效形式主要为齿面点蚀和齿根疲劳断裂；讨论了喷油润滑下PEEK齿轮齿面点蚀与齿根疲劳断裂的失效机理，发现了PEEK齿轮接触疲劳失效与弯曲疲劳失效之间的临界转变关系，并提出了PEEK齿轮失效形式的评估方法。当PEEK齿轮接触应力与弯曲应力之比低于1.02时，PEEK齿轮主要发生齿根疲劳断裂；接触应力与弯曲应力之比高于1.10时，PEEK齿轮主要发生齿面点蚀破坏；接触应力与弯曲应力之比在1.02~1.10之间时，存在齿面接触疲劳与齿根弯曲疲劳的临界失效转变点。

Polyetheretherketone (PEEK) gears are high-performance polymer gears widely used in automobiles, drones, robots, and other fields. However, the complex failure mechanism of PEEK gears and the lack of basic data on loading capacity lead to a shortage of a reasonable design basis in power transmission applications. To address the unclear failure mechanism and the lack of fundamental durability data of PEEK gears, fatigue performance tests of PEEK helical gear pairs under oil-jet lubrication were carried out, and the contact stress and bending stress were calculated. The failure mechanism were investigated by using scanning electron microscopy and other equipment. Experimental results show that the primary failure modes of PEEK gears under oil-jet lubrication were tooth surface pitting failure and tooth root fatigue fracture. The critical transition relationship between PEEK gear contact fatigue failure and bending fatigue failure was identified, and an evaluation method for the failure form of PEEK gears was proposed. When the ratio of contact stress to bending stress of the PEEK gear was smaller than 1.02, the PEEK gear mainly suffered from root fatigue fracture; when the ratio of contact stress to bending stress was larger than 1.10, the PEEK gear mainly suffered from tooth surface pitting failure. When the ratio was in the range from 1.02 to 1.10, there was a critical failure threshold between tooth surface contact fatigue and root bending fatigue.

TH132.417

国家自然科学基金资助项目（52175041）；2022年重庆市研究生科研创新项目（CYB22008）。