含轴承倾斜不对中的行星轮系‑转子系统动态特性研究

Dynamic characteristics of planetary gear-rotor system with bearing tilt misalignment

针对某履带车辆汇流行星排传动系统支撑轴承存在的安装不对中问题,建立了含轴承倾斜不对中的行星轮系⁃转子系统动力学方程。理论推导了可考虑球轴承分别处于内/外圈倾斜不对中故障条件下的轴承力模型。将该模型与行星轮系集中质量模型以及转子有限元模型耦合,得到了行星排传动系统动力学模型。分析了轴承不对中对系统动态特性的影响,并讨论了滚道曲率半径和轴承间隙等参数对系统动力学特性的演变规律。结果表明,倾斜不对中使轴承接触力急剧增大;接触角、接触刚度、轴承间隙产生周期性波动;变柔度振动频率幅值增大,系统振幅降低。提高滚道曲率半径和轴承初始间隙会增大变柔度振动。但适当选择较大的轴承间隙,可抵消轴承安装不对中造成的不利影响。

Aiming at the misalignment problem of the support bearing in the planetary gear transmission system of a tracked vehi⁃cle,the equation of motion of the planetary gear-rotor system with bearing tilt misalignment was established.A bearing force mod⁃el was proposed based on the nonlinear Hertz contact theory,which could be considered when the ball bearing was respectively in the condition of inner/outer ring tilt misalignment.The proposed model was coupled with the lumped mass model of planetary gear and the finite element model of rotor,and the dynamic model of planetary gear transmission system was obtained.The influence of bearing misalignment on the system dynamic characteristics was analysed,and the evolution law of the parameters such as raceway curvature radius and initial bearing radial clearance on the system dynamic characteristics was further discussed.The results show that the bearing tilt misalignment lead to the sharp increase of bearing contact force,the periodic fluctuation of contact angle,con⁃tact stiffness and bearing clearance,the increase of varying compliance(VC)vibration frequency amplitude and the decrease of sys⁃tem amplitude.Enhancing the raceway curvature radius and bearing initial clearance can increase the VC vibration.However,the appropriate selection of large bearing clearance can offset the adverse effects caused by tilt misalignment of bearing installation.