A Study on the Heat Dissipation Effects During the Meshing Process of Involute Gears with Variable Tooth Thickness
Abstract
1. Introduction
2. Mathematical Models and Methods
2.1. Mathematical Equations of Involute Variable-Tooth-Thickness Gears
2.2. Gear Solid Modeling
2.3. Fluid Governing Equations
2.4. Heat Generation in Gear Meshing
2.5. Numerical Model and Boundary Conditions
3. Model Validation
4. Results and Discussion
4.1. Effect of Oil Injection Velocity on Thermal Behavior
4.2. The Effect of Gear Width on Temperature
4.3. The Effect of Axial Displacement on Temperature
5. Conclusions
- (1)
- The simulation results indicate that as the oil injection velocity increases, the cooling performance inside the gearbox decreases, though temperature reduction still occurs. A comparison of the temperature data comparison shows that a 15 m/s injection velocity with a 4° pitch cone angle provides a more economical cooling performance than other configurations. These findings support the selection of cost-effective, eco-friendly lubrication speeds and inform similar practical applications.
- (2)
- A larger pitch cone angle markedly reduces the maximum and minimum internal temperatures of the gearbox. This analysis provides a reference for the pitch cone angle design of variable-tooth-thickness involute gears. However, it should also be noted that an excessively large pitch cone angle may result in thinner teeth, thereby reducing their bending fatigue strength. Thus, excessively large pitch cone angles should be avoided, and optimal design requires a balanced consideration of multiple factors.
- (3)
- The influence of gear width on temperature shows that increasing the gear width significantly raises the internal temperature of the gearbox. When the driven wheel tooth width is fixed, selecting a smaller gear width ratio can significantly reduce the internal temperature. This analysis provides a scientific basis for selecting the optimal width for variable-tooth-thickness involute gears.
- (4)
- The temperature response to axial displacement shows that the gearbox temperature increases with larger positive or negative offsets of variable-tooth-thickness involute gears. The minimum temperature occurs at zero displacement. This analysis provides a theoretical reference for selecting appropriate axial backlash adjustments in variable-tooth-thickness involute gear design.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Parameter | Driving Wheel | Driven Wheel |
---|---|---|
Normal module/mm | 2.5 | |
Center distance/mm | 80 | |
Number of teeth | 25 | 37 |
Pressure angle/(°) | 20 | |
Tooth width/mm | 28 | 26 |
Pitch angle/(°) | 0°, 2°, 4° | |
Taper coefficient at the small end | 0.01 | 0.0081 |
Taper coefficient at the large end | 1.187 | 1.101 |
Pitch circle diameter/mm | 62.5 | 92.5 |
Boundary | Velocity | Temperature | Pressure |
---|---|---|---|
Oil injection inlet | 12.5 m·s−1 | 300 K | |
15 m·s−1 | 300 K | ||
17.5 m·s−1 | 300 K | ||
20 m·s−1 | 313.15 K | --- | |
Oil outlet | --- | 317.15 K | 0 pa |
Gears | 8000 rpm | udf | --- |
Gearbox | --- | 300 K | --- |
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Zhang, H.; Liu, Y.; Guo, J. A Study on the Heat Dissipation Effects During the Meshing Process of Involute Gears with Variable Tooth Thickness. Machines 2025, 13, 686. https://doi.org/10.3390/machines13080686
Zhang H, Liu Y, Guo J. A Study on the Heat Dissipation Effects During the Meshing Process of Involute Gears with Variable Tooth Thickness. Machines. 2025; 13(8):686. https://doi.org/10.3390/machines13080686
Chicago/Turabian StyleZhang, Huicheng, Yongping Liu, and Junhai Guo. 2025. "A Study on the Heat Dissipation Effects During the Meshing Process of Involute Gears with Variable Tooth Thickness" Machines 13, no. 8: 686. https://doi.org/10.3390/machines13080686
APA StyleZhang, H., Liu, Y., & Guo, J. (2025). A Study on the Heat Dissipation Effects During the Meshing Process of Involute Gears with Variable Tooth Thickness. Machines, 13(8), 686. https://doi.org/10.3390/machines13080686