Abstract
In the previous dynamic models of spur gear transmission systems, the effect of bearing clearance on gear backlash and mesh stiffness was ignored. In fact, bearing clearance has an effect on gear backlash and mesh stiffness, and the effect of which is related to vibration displacement. In this study, a nonlinear dynamic model of a spur gear pair with six degrees of freedom was developed, which took into account the surface friction, gear backlash, bearing clearance, transmission error and meshing stiffness. The variation of initial gear backlash and rotational speed was analyzed comprehensively according to the effect of bearing clearance on the meshing stiffness and dynamic gear backlash. After that, the dynamic characteristics under different excitation parameters were obtained. The results indicate that the vibration of the gear system is more violent when the effect of bearing clearance is taken into account. This study can provide a better understanding of the dynamic design of gears under practical conditions.
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Abbreviations
- r ζ :
-
Pitch radii
- z ζ :
-
Numbers of teeth
- m n(ζ = 1, 2):
-
Modulus
- r ζn :
-
Distance between the meshing point and gear center
- a :
-
Standard central distance
- α :
-
Standard pressure angle
- r a1 :
-
Radius of the addendum circle of the driving gear
- r b1 :
-
Radius of the basic circle of the driving gear
- r a2 :
-
Radius of the addendum circle of the driven gear
- r b2 :
-
Radius of the basic circle of the driven gear
- cr :
-
Contact ratio
- x :
-
Vibration displacement in x direction
- y :
-
Vibration displacement in y direction
- θ :
-
Vibration angular displacement
- e(t):
-
Static transmission error
- F mi (i = 1, 2):
-
Dynamic meshing force of the ith gear pair
- k mi (i = 1, 2):
-
Time-varying meshing stiffness of the ith gear pair
- c mi (i = 1, 2):
-
Meshing damping of the ith gear pair
- f ms(Y):
-
Gear backlash function for the backlash
- f md(Ẏ):
-
Gear backlash function for the relative speed
- Δb :
-
Dynamic backlash
- 2b 0 :
-
Actual gear backlash
- 2b h :
-
Initial gear backlash
- f bm(x):
-
Bearing clearance function for bearing clearances
- f bd(ẋ):
-
Bearing clearance function for relative speed
- λ i :
-
Directional coefficient
- μ i :
-
Friction coefficient of the tooth surface
- w :
-
Angular velocity
- L 1i, L 2i :
-
Arms of the friction force between the ith tooth pair
- c r :
-
Bearing support damping
- k r :
-
Bearing support stiffness
- T 1, T 2 :
-
Input and output torques
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Acknowledgements
This work was supported by Research Program supported by the National Natural Science Foundation of China (Grant No. 51975064), China
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Geng, Z., Chen, M., Han, Y. et al. Modelling and analysis of a spur gear pair with the effect of bearing clearances. J Braz. Soc. Mech. Sci. Eng. 45, 392 (2023). https://doi.org/10.1007/s40430-023-04297-5
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DOI: https://doi.org/10.1007/s40430-023-04297-5