柔性销轴式立磨用行星齿轮动态均载性能研究

Study on Dynamic Load Sharing Performance of Planetary Gears with Flexible Pins for Vertical Mills

以柔性销轴式立磨用行星齿轮为研究对象,建立柔性销轴有限元模型;综合考虑制造误差、安装误差、时变啮合刚度、轴承支承刚度等影响,建立带有柔性销轴的行星齿轮系统的动力学模型,研究行星轮系在综合误差下的动态均载性能,分析加工精度、各齿轮误差激励和柔性销轴尺寸对立磨机行星轮系均载性能的影响。结果表明,与普通销轴比较,柔性销轴能够降低轮系均载系数;提高齿轮加工精度,可以提高轮系的均载性能;齿轮加工精度等级越低,柔性销轴在均载方面的优势越明显。此外,各齿轮制造误差对轮系均载性能的影响大于安装误差;在各齿轮误差中,内齿圈制造误差对轮系均载性能的影响最大;销轴直径、销轴和套筒的接触线长度对轮系均载性能有显著影响,合理设计柔性销轴结构可以改善轮系均载性能。

Taking the planetary gear with flexible pins for vertical mills as the research object,a finite ele⁃ment model of flexible pins is established.The dynamics model of planetary gear system with flexible pins is es⁃tablished by considering the effects of manufacturing and mounting errors,time-varying meshing stiffness and bearing support stiffness.The dynamic load sharing performance of the system under equivalent meshing errors is studied.The effects of machining accuracy,error excitation and flexible pin structure on the load sharing per⁃formance of the system are investigated.The results show that the flexible pin can reduce the load sharing coeffi⁃cient of the planetary system compared with the common pin.The lower the gear machining accuracy level is,the more obvious the advantage of flexible pins in load sharing performance is.In addition,the influence of man⁃ufacturing error is greater than that of assembly error.The manufacturing error of the sun gear has the greatest in⁃fluence.The diameter of the pin and the length of the contact line between the pin shaft and the sleeve have a significant impact on the load sharing performance.The reasonable design of the flexible pin structure can im⁃prove the load sharing performance of the wheel system.