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Study of Impact Loading on Helical Gears using Finite Element Analysis
Technical Paper
2013-01-1773
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Helical gears in manual transmission are designed based on static loading. Sometimes these gears are subjected to impact during misuse events such as sudden engagement and disengagement of clutches, inappropriate shifting of gears, while vehicle is negotiating different maneuvers. These misuse events call for the need to consider the study the gear strength under impact loading in design phase.
In this paper, attempt is made to evaluate stresses in the gear root under impact using the dynamic implicit algorithm available with commercial Finite element analysis (FEA) software Abaqus. Dynamic analysis is run for duration of few milliseconds to capture both impact and rebounding events. First gear pair, which is generally heavy loaded among all gear pairs, is considered for simulation.
Initially, static analysis is performed for different pitch positions of one mesh to find out the most critical pitch position in which stresses in fillets reach their peak values. In the analysis, input shaft on which pinion is cut and driven gear are modeled and part of input shaft is included as stiffness matrix to reduce the computational time. Input shaft is constrained in all degrees of freedom and reactive torque is applied on driven gear wheel. Dynamic analysis is performed for critical pitch position obtained from static analysis. Variation of Stresses and tooth contact force with respect to time are evaluated from this analysis. In order to get smooth curves of results, results are obtained at very frequent time intervals. Further to quantify the intensity of impact, values of peak stresses during impact were compared against static stresses.
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Citation
Penumatsa, V., "Study of Impact Loading on Helical Gears using Finite Element Analysis," SAE Technical Paper 2013-01-1773, 2013, https://doi.org/10.4271/2013-01-1773.Also In
References
- Abaqus/Standard 6.8, User's Manual
- Chen Yi-Cheng , Tsay Chung-Biau analysis of a helical gear set with localized bearing contact Finite elements in analysis and design 38 2002 707 723
- Cook R.D. , Malkus D.S. and Plesha M.E. Applications of Finite Element Analysis 3rd Wiley U.S.A., New York 1989