Abstract
The raceway misalignment of deep groove ball bearings is a typical engineering problem that dramatically influences the supporting stiffness and vibration behaviors of gear transmission systems. Considering the influences of meshing of the spur gear pair, the connection of the spline, and the flexibility of the shaft in the practical transmission system, a method for calculating the stiffness of bearings with raceway misalignment is proposed. The effects of misalignment angle, input torque and rotational speed on radial, axial and coupling stiffness are analyzed. Subsequently, the dynamic model of the gear-rotor-bearing system is established, and the influences of the time-varying and coupling characteristics of bearing stiffness on the vibration of the system are analyzed. The results show that the raceway misalignment enhances the radial and axial coupling characteristics of the bearing stiffness and aggravates the axial vibration of the system, which is mainly manifested in the increase of the amplitude of the axial meshing frequency. The vibration amplitude of the system is easily affected by high-order resonance in the case of raceway misalignment.
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