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Bending fatigue strength of case-carburized helical gears (In the case of large helix angles)

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Abstract

Case-carburizing enlarges the depth of the hardened layer at the tooth width end on the acute angle side of helical gears. For the helical gears with large helix angles (Exceeding 25°), this hardened layer may lower their bending fatigue strength. Therefore, we investigated the influence of this hardened layer on their bending fatigue strength through the bending fatigue tests. Our results suggest that this hardened layer might reduce the case-carburizing’s effect to enhance their bending fatigue strength. Thus, using only the maximum tooth root stress would be inadequate for evaluating their bending fatigue strength, and it would be necessary to consider the relationship between the hardened layer and the tooth root stress distribution (Especially, the stress applied at the tooth width end on the acute angle side) from the beginning of meshing to the end.

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Authors and Affiliations

  1. Mechanical and Material Research Laboratory, Tottori Institute of Industrial Technology, 1247 Kusaka, Yonago, 689-3522, Japan

    Kengo Nojima

  2. Department of Mechanical and Aerospace Engineering, Graduate School of Engineering, Tottori University, 4-101 Koyama Minami, Tottori, 680-8552, Japan

    Kengo Ogata, Motomu Tanaka, Ryosuke Nishi, Yuichi Ono & Takao Koide

Authors
  1. Kengo Nojima
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  2. Kengo Ogata
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  3. Motomu Tanaka
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  4. Ryosuke Nishi
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  5. Yuichi Ono
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  6. Takao Koide
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Correspondence to Kengo Nojima.

Additional information

Kengo Nojima received his B.S. in Mechanical Engineering from Tottori University in 2002. Since 2003, he has been working in Tottori Institute of Industrial Technology and his current position is the Assistant Research Engineer. He is also a Ph.D. student at Tottori University. His research interests include mechanical element parts and metallic materials.

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Nojima, K., Ogata, K., Tanaka, M. et al. Bending fatigue strength of case-carburized helical gears (In the case of large helix angles). J Mech Sci Technol 31, 5657–5663 (2017). https://doi.org/10.1007/s12206-017-1106-0

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  • DOI: https://doi.org/10.1007/s12206-017-1106-0

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