Abstract: The current evaluation methods for the tooth surface load capacity of polymer gears still rely on the methods for metal gears, which did not comprehensively consider the influences of material type, lubrication condition and stress of the polymer gears. This would lead to significant reliance on engineering experience for material selection, strength design and loading capacity evaluation in practical engineering applications. Therefore, a polymer gear tooth surface load capacity evaluation method was proposed based on the nominal gear equivalent load. Over 169 sets of data and more than 6000 hours of durability tests on polymer gears were obtained, considering different lubrication conditions, gear materials, and machining methods. The results show that oil lubrication may significantly improve the tooth surface load capacity of plastic gears, and the tooth surface load capacity of PEEK(polyether ether ketone) gears is more than 30% higher than that of POM(polyoxymethylene) and PA66(polyamide) gears under oil lubrication, which provides an evaluation method and basic data support for active design and transmission power applications of polymer gears.

Key words: polymer gear, equivalent load, load capacity, evaluation method

摘要： 目前，聚合物齿轮主要沿用金属齿轮齿面承载能力评价方法，未能综合考虑聚合物齿轮材料属性、润滑状态和应力条件等多因素的影响，导致工程实际中聚合物齿轮材料选择、强度设计和齿面承载能力评估时严重依赖工程经验，限制了高承载精益设计。提出了基于标称齿轮当量载荷的聚合物齿轮齿面承载能力评价方法，获取了不同润滑状态、齿轮材料、加工方式等在内的共169组、6000余小时聚合物齿轮耐久试验数据。研究结果表明，油润滑可显著提高塑料齿轮的齿面承载能力，且油润滑下PEEK（聚醚醚酮）齿轮相比POM（聚甲醛）和PA66（聚酰胺）齿轮的齿面承载能力高30%以上，为聚合物齿轮主动设计和动力传递应用提供了评价方法和基础数据支撑。

关键词: 聚合物齿轮, 当量载荷, 承载能力, 评价方法