含轴向偏载的行星齿轮传动系统动态特性研究

A study on the dynamic characteristics of a planetary gear system with considering contact tooth surface

轴向偏载是影响行星轮传动系统工作状态的重要因素,以行星轮传动系统为研究对象,运用牛顿动力学理论建立了行星传动平移-扭转动力学模型,讨论了轴向偏载对啮合刚度的影响。在考虑轮齿齿面接触特性基础上,揭示了轴向偏载对行星传动系统动态特性的影响。研究表明:太阳轮发生轴向偏载后,齿面接触区域产生偏移,其啮合刚度也随之发生改变。随着偏载的增大,啮合刚度逐渐减小,对行星传动系统的高阶固有频率影响较为明显。太阳轮与行星轮的外啮合动载荷将出现转频成分,并且当偏载增大时,其转频成分将明显增大,但其他频率成分基本保持不变。当存在轴向偏载时,浮动轨迹由圆形分布变为椭圆形分布,浮动轨迹中的变形量增加,从而系统振动更加明显,啮合冲击更激烈,影响系统的使用寿命。

Axial partial load is an important factor influencing the stability of a planet wheel drive system. Based on the planet wheel drive system and the Newtonian dynamics theory, a planetary transmission dynamics model was established. The effect of axial load for meshing stiffness was studied. At the same time,considering the influence of the tooth surface contact characteristics of mesh stiffness,the axial partial load impact on the natural frequency of the planetary system,the influence of the axial partial load on the system dynamic characteristics was studied. The research shows that: the sun wheel connects thin rod axial after partial load,the meshing stiffness decreases with the increase of partial load. Axial deviation of the existence of a planet wheel has obviously influence on high order natural frequency.When the partial load increases,the high order natural frequency decreases. With the increase of axial partial load round the sun and the planets round of external gear dynamic load changes into a sine curve,frequency domain figure appeared switch frequency. And partial load increases,the frequency amplitude increases obviously. Meshing frequency amplitude is basically stable,does not affect the frequency doubling amplitude.