针对摆线轮、针轮、曲柄轴等关键承载部件的装配误差、制造误差,以及各级齿轮接触弹性变形和支承弹性变形对RV减速器传动精度的影响,提出了基于Newmark-β法考虑加工和装配误差以及柔性因素的RV减速器动态传动误差分析方法。首先,对原始系统动力学模型的动态响应进行时频联合域分析,找出减速器各级振动信号成因,为后续引入装配及制造误差的横向分析提供基础;其次,结合光弹实验,采用有限差分法分析比较了减速器传动误差对各处装配及制造误差的影响灵敏度;然后,量化分析变载、变速和误差条件下各级传动接触及支承弹性变形对动态传动误差的贡献率;最后,结合灵敏度和误差贡献率进行横向比较,确定影响传动精度的主要因素。仿真结果表明:针齿半径误差对传动精度影响最大,其次是曲柄轴凸轮偏心误差,再次是摆线轮的曲柄轴孔偏心误差,最后是针齿壳中心圆半径误差;在变工况传动精度分析中,动态传动误差随负载的增加而增加,输出转速平稳性随负载和转速增加而降低;在柔性变形误差贡献率分析中,低速级齿轮的接触变形贡献率最大,为51%以上,支承变形贡献率次之,介于15%~30%之间。该研究结果可为RV减速器传动误差优化提供一定的参考。
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