A torsional dynamics model of planetary gears was developed to study the effects of elastic ring gear on its dynamics characteristics. The models were solved by using numerical methods. Some experiments were taken based on numerical results. The numerical and experimental results show that the mesh stiffness influences the dynamic loads for planetary gear systems with elastic ring gear significantly, and high dynamic loads for system will yield as the difference between external and internal mesh stiffness becomes large, substituting elastic ring gear for rigid one can increase dynamic loads on sun-planet mesh markedly, however, reduce dynamic loads on ring-planet mesh to certain extent. Sun-planet dynamic load can be reduced by decreasing their mesh stiffness. The system mesh dynamic loads may effectively be reduced by choosing system parameters properly in planetary gear systems with elastic ring gear.

planetary gear, dynamic load, mesh stiffness, elastic ring gear

为了深入了解引入大弹性内齿圈后行星传动系统的动力学特性,建立了行星齿轮扭转动力学模型,结合实例,采用数值仿真法对模型进行了求解,分析了啮合刚度对系统啮合动载荷的影响,并基于数值分析结论进行了实验研究。数值仿真与实验研究结果表明:啮合刚度对含大弹性内齿圈的行星传动系统的啮合动载荷有较大影响,当内外啮合刚度值相差较大时,系统啮合动载荷较大;大弹性内齿圈的引入在很大程度上增大了太阳轮与行星轮的啮合动载荷,同时使行星轮与内齿圈的啮合动载荷有所减小;降低太阳轮与行星轮的啮合刚度有助于减小其啮合动载荷。在行星齿轮传动系统中,合理地选择构件参数可显著减小系统的啮合动载荷,从而有效降低系统的振动和噪声。

行星齿轮, 动载荷, 啮合刚度, 大弹性内齿圈