目的 针对RV减速器寿命评估试验周期长、耗资高等问题,提出一种基于有限元的偏心轴寿命高效计算框架,及综合偏心轴与偏心轴轴承来评估RV减速器寿命的计算方法,避免寿命试验带来的高耗时。方法 利用有限元理论建立适用偏心轴的寿命评估模型,基于轴承寿命基本模型建立偏心轴轴承的寿命评估模型,通过对不同偏心距下的偏心轴及偏心轴轴承寿命的分析,得到不同偏心距下偏心轴机构的薄弱部分,以此来综合评估RV减速器的寿命。结果 随着偏心距的增加,RV减速器的寿命增加,当偏心距大于0.97 mm时,薄弱零件为偏心轴轴承,当偏心距为1.25 mm时RV减速器的最大寿命为7 823 h。搭建加速寿命试验台进行寿命试验,RV减速器寿命计算方法与试验结果误差小于10%,验证了理论计算方法的准确性。结论 寿命为RV减速器可靠性的重要判定标准,该计算方法为降低试验成本、节约生产时间及RV机构的设计提供了一定理论依据。
Abstract
To solve the problems of long test cycle and high cost of service life evaluation of RV reducers, the work aims to provide an efficient calculation framework for eccentric shaft service life based on finite element method and propose a calculation method for evaluating RV reducer service life by combining eccentric shaft and eccentric shaft bearing to shorten the time consuming caused by service life test. The finite element theory was used to establish the service life evaluation model of eccentric shafts, and the service life evaluation model of eccentric shaft bearings was established based on the basic model of bearing service life. Through the service life analysis of eccentric shafts and eccentric shaft bearings under different eccentricities, the weak parts of eccentric shaft mechanisms under different eccentricities were obtained, so as to evaluate the service life of RV reducers. With the increase of the eccentricity, the service life of the RV reducer increased. When the eccentricity was greater than 0.97 mm, the weak part was the eccentric shaft bearing. When the eccentricity was 1.25 mm, the maximum service life of the RV reducer was 7 823 hours, and the error between the calculation method of RV reducer service life and the test results was less than 10%, which verified the accuracy of the theoretical calculation method. Service life serves as a critical criterion for evaluating the reliability of RV reducers. This calculation method provides a theoretical basis for reducing test costs, saving production time, and guiding the design of RV mechanisms.
关键词
RV减速器 /
寿命 /
偏心轴轴承 /
偏心距
Key words
RV reducer /
service life /
eccentric shaft bearing /
eccentricity
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