喷油润滑下PEEK齿轮的疲劳失效临界转变关系  

Critical transition relations for fatigue failure of PEEK gear under oil-jet lubrication

作　　者：胡新磊 李静[1] 刘怀举[1] 魏沛堂[1] 卢泽华 吴若 HU Xinlei;LI Jing;LIU Huaiju;WEI Peitang;LU Zehua;WU Ruo(College of Mechanical and Vehicle Engineering,Chongqing University,Chongqing 400044,P.R.China)

机构地区：[1]重庆大学机械与运载工程学院,重庆400044

出　　处：《重庆大学学报》2024年第11期27-36,共10页Journal of Chongqing University

基　　金：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)。

摘　　要：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.

关 键 词：聚醚醚酮(PEEK)齿轮 承载能力 齿轮温度 失效形式 

分 类 号：TH132.417[机械工程—机械制造及自动化]