| Effect of Rim and Web Thickness on Tooth Root Stress of Spur Gear
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| Jungho Park 1, Woo-jin Chung 1, Young-Jun Park 1,2,3, Heung-Sub Kim 4, Jin Beom Seo 5, Jong Sang Park 5 |
1Department of Biosystems Engineering , Seoul National University
2Research Institute of Agriculture and Life Sciences , Seoul National University
3Global Smart Farm Convergence , Seoul National University
4Department of Smart Industrial Machinery , Korea Institute of Machinery and Materials
5Hyundai Motor Company R&D Center , Hyundai Motor Company |
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| ABSTRACT |
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This study investigated the impact of spur gear rim and web thickness on root stress. A fi nite-element analysis model (FEM)
was utilized and validated through a gear-bending test. Four gears with diff erent rim and web specifi cations, including a solid
gear, were designed and tested using strain gages to measure their root stress. The 3D FEM was validated by comparing the
measured root stresses with that analyzed by the developed FEM. Using this model, a parametric study was conducted by
varying the web position, pressure angle, and module to investigate the eff ect of the backup ratio on the root stress ratio of
the gear. A stress-ratio map was generated based on the results. This stress-ratio map was compared with the rim thickness
factor ( YB ) for external spur gears specifi ed in ISO 6336-3. The comparison reveals that the rim thickness factor specifi ed
in ISO 6336 is overly conservative compared to values obtained in this study. Our results suggest that the thickness of both
the rim and web should be considered to reduce the weight of spur gears. These fi ndings can be applied to the design of
lightweight spur gears. |
| Key Words:
External spur gear · Thinned-rim gear · Rim thickness · Web thickness · Light-weight design · FEA · Tooth root stress
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Corresponding Author.
Jungho Park , Email. 
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