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CSME 2018/08
Volume 39 No.4
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355-364
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The Design and Fatigue Life Prediction for a Speed-Reduction Device
Yuo-Tern Tsaia, Kuan-Hong Linb and Kuo-Shong Wangc
aDepartment of Mechanical Engineering, Hungkuo Delin University of Technology, 236, Taiwan, R.O.C.
bDepartment of Mechanical Engineering, Tungnan University, 222, Taiwan, R.O.C.
cDepartment of Mechanical Engineering, National Central University, Chungli, Taiwan, ROC.
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Abstract:
This paper presents the methods of structural stress analysis and fatigue-life prediction for a reducer possessing high reduction ratios. It contains (1) the design and kinematic simulation of an eccentric cam reducer, (2) the analyses of root bending stress (RBS) and surface contact stress (SCS) of the reducer based on ISO standard 6336-3, (3) the predictions of bending and contact fatigue lives of the reducer based on ANSI/AGMA models and a linear model, and (4) the finite element stress analysis of the reducer combining with a fatigue-life and reliability analysis. The analyzed stresses in finite element methods (FEM) are compared with those in formula calculation to identify the accuracy of the geometric models. The fatigue lifetimes of the reducer predicted by the ANSI/AGMA and the proposed models are compared to identify the feasibility of the prediction model. Reliability degradation of the reducer at different loads is further studied for giving the risks within the preset used times. The analyzed results show that failures of the reducer are primarily incurred by the bending stress. The studied results are useful in designing, structural stress analysis and fatigue-life prediction for developing a high ratio speed-reduction device.
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Keywords: fatigue life, reliability, FEM, reducer.
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*Corresponding author; e-mail: yttsai@mail.hdut.edu.tw
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©
2018
CSME , ISSN 0257-9731
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