Abstract
Gears are important components of the transmission system. Tooth wear and bearing clearance are significant factors affecting the dynamics of the gear system. In order to reveal the effects of gradual wears and bearing clearance on the gear system dynamics, a six-degrees-of-freedom bending-torsion coupled model of gear-rotor-bearing which considers surface wear, bearing clearance and backlash is established. The Rung-Kutta method is used to solve the nonlinear dynamic system, and the dynamic responses of the system are obtained. The results show that the time-varying mesh stiffness decreases with the tooth surface from the unworn phase to severe wear phase. At the same time, the change of the mesh stiffness in the double-tooth mesh area and single-tooth area are different. Moreover, the amplitude of the X-displacement, Y-displacement and relative gear mesh displacement will be enlarged slightly with the increase of wear depth or bearing clearance. By analyzing variation tendency in the frequency domain, the different order harmonics show the different change characteristic with the variation of the wear phases or bearing clearances. This study provides a theoretical basis for improving the transmission performance and the selection of the bearing clearances in the gear system.
Highlights
Geared rotor bearing systems are commonly employed as power transmission mechanisms, and gear system dynamics has received significant attention in recent years
The multi-clearances, including bearing clearance and backlash, is an important factor affecting the dynamics of the gear system
Xu et al [10] explored the influence of the backlash and bearing clearance on the characteristics of the gear transmission system by establishing an eight-degrees-of-freedom dynamic model
Summary
Geared rotor bearing systems are commonly employed as power transmission mechanisms, and gear system dynamics has received significant attention in recent years. Chen et al [7] derived the connection between the gear central distance error and backlash, and defined the dynamic backlash After that, they established a multi-degree of freedom gear system model, and the influence of dynamic backlash on the system was studied. Xu et al [10] explored the influence of the backlash and bearing clearance on the characteristics of the gear transmission system by establishing an eight-degrees-of-freedom dynamic model. The elastic dynamics model of gear teeth with two degrees of freedom was established by Wojnarowski et al [12] Later, they analyzed and studied the effects of deformation and wear on the dynamics of spur gears. Ding et al [13] established a dynamic model considering the factors such as tooth surface wear and comprehensive errors, and studied the influence of surface wear on the dynamics of the gear system. The effects of gradual wears and bearing clearance on the dynamics of the gear system are analyzed by numerical simulation
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