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TECHNICAL PAPERS

Evaluation of Bending Strength of Carburized Gears Based on a Quantification of Defect Size in the Surface Layer

[+] Author and Article Information
Tomoya Masuyama

Research Assistant, Department of Machine Intelligence and Systems Engineering, Tohoku University, Sendai 980-8579, Japane-mail: masu@elm.mech.tohoku.ac.jp

Masana Kato

Department of Machine Intelligence and Systems Engineering, Akita Prefectural University, Honjo 015-0055, Japane-mail: kato@akita-pu.ac.jp

Katsumi Inoue

Department of Machine Intelligence and Systems Engineering, Tohoku University, Sendai 980-8579, Japane-mail: inoue@elm.mech.tohoku.ac.jp

Toshihiko Yamashita

Electronic Controls Division, Yamaha Motor Co., Ltd., Iwata 438-8501, Japane-mail: yamashitat@yamaha-motor.co.jp

J. Mech. Des 124(3), 533-538 (Aug 06, 2002) (6 pages) doi:10.1115/1.1485091 History: Received December 01, 2000; Online August 06, 2002
Copyright © 2002 by ASME
Topics: Gears
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References

Figures

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Carburizing and heat treatment of test gears
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Hardness at the fillet of test gears
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Pulsating fatigue test rig
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Electron beam scanning image of Mn
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Electron beam scanning image of Si
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A model of crack initiation mechanism
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Strength of carburized gear with a micro notch
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Strength of electropolished gear with a micro notch
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Comparison between strength of gears with nonmartensitic layer estimated by the proposed formula and fatigue strength obtained by experiment
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Electron beam scanning image of Cr
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Electron microscopic structure near the fillet
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The measured area in EPMA analysis (The tooth is cut obliquely to obtain a cross section with a thick nonmartensitic layer)
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A cross section of carburized gear after loading (Loading was stopped just after detective gage breakage)
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A cross section of carburized gear before loading (Nonmartensitic layer of approximately 5 to 15 μm thickness is observed at the surface(right))
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Detective gage adhered to a tooth fillet

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