目的 针对国产RV减速器承载能力弱、承载性能评估标准不明晰等问题,提出一种承载性能评估模型,用以评估不同型号尺寸RV减速器摆线针轮传动机构的承载性能,并研究RV减速器摆线针轮传动机构的针齿半径、针齿分布圆半径、偏心距对机构动态承载能力的影响。方法 基于摆线针轮机构啮合传动关系,构建负载下摆线轮齿动态载荷分布及动态应力分布函数,基于摆线轮与偏心轴之间的传动受力关系,构建偏心轴刚度计算模型,综合考虑摆线针轮啮合与偏心轴刚度,构建摆线针轮机构承载性能评估模型。结果 偏心距对摆线轮动态载荷分布系数、动态最大接触应力、偏心轴刚度等3个表征因素均有较大影响,在研究范围内,针齿半径、针齿分布圆半径、偏心距每变化0.1 mm,承载评估系数平均变化值分别为0.002 3、0.003 3、0.042 5。结论 偏心距对承载评估性能的影响最大,动态最大接触应力为摆线针轮传动机构承载性能最主要的评估因素,所建立的摆线针轮机构承载性能评估模型为RV减速器摆线针轮传动机构的承载性能评估及设计参数优化提供了理论依据。
Abstract
The work aims to propose a load-bearing performance evaluation model to evaluate the load-bearing capacity of the cycloid-pin gear transmission mechanism of RV reducers with different models and sizes, and study the impact of pin tooth radius, pin tooth distribution circle radius and eccentricity on the dynamic load-bearing capacity of the mechanism, so as to deal with the weak load-bearing capacity and unclear evaluation standards of domestic RV reducers. Based on the meshing transmission relationship of cycloid-pin gear mechanism, the dynamic load distribution and dynamic stress distribution functions of the cycloid teeth under load were established. An eccentric shaft stiffness calculation model was established through the relationship of force between the cycloid gear and the eccentric shaft. The load-bearing capacity evaluation model of the cycloid-pin gear mechanism was established by comprehensively considering the meshing of the cycloid-pin gear and the stiffness of the eccentric shaft. It was pointed out that the eccentricity had a great influence on the three characterization factors of the dynamic load distribution coefficient, the dynamic maximum contact stress of the cycloid gear and the eccentric shaft stiffness. Within the research scope, the average variation of the load-bearing evaluation coefficient was 0.002 3, 0.003 3 and 0.042 5 for each 0.1 mm change of the pin tooth radius, the pin tooth distribution circle radius and the eccentricity. Eccentricity has the greatest influence on the load-bearing capacity evaluation, and the dynamic maximum contact stress is the most important factor to evaluate the bearing capacity of the cycloid-pin gear transmission mechanism. The load-bearing capacity evaluation model established in this study provides a theoretical basis for the bearing capacity evaluation and design parameter optimization selection of the cycloid-pin gear transmission mechanism of RV reducers.
关键词
RV减速器 /
摆线针轮传动 /
承载性能评估
Key words
rotary vector reducer /
cycloid-pin gear transmission /
evaluation of load-bearing capacity
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