Bending fatigue strength of case-carburized helical gears with large helix angles up to 40 degrees

Case-carburizing of helical gears with large helix angles may form too large hardened layers near the tooth width end on the acute angle side (ACUTE-END), and adversely affect the bending fatigue strength. We investigated the bending fatigue strength of casecarburized helical gears with large helix...

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Bibliographic Details
Published in:Journal of mechanical science and technology 2019, 33(12), , pp.5699-5709
Main Authors: Yamaoka, Mikiya, Tanaka, Motomu, Kumada, Masaya, Nojima, Kengo, Nishi, Ryosuke, Ono, Yuichi, Koide, Takao
Format: Article
Language:English
Subjects:
Bend strength
Bending fatigue
Carburizing
Case hardenability
Compressive properties
Control
Dynamical Systems
Engineering
Fatigue strength
Fatigue tests
Hardness tests
Heat treating
Helical gears
Industrial and Production Engineering
Mechanical Engineering
Residual stress
Stress measurement
Vibration
기계공학
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Summary:Case-carburizing of helical gears with large helix angles may form too large hardened layers near the tooth width end on the acute angle side (ACUTE-END), and adversely affect the bending fatigue strength. We investigated the bending fatigue strength of casecarburized helical gears with large helix angles up to approximately 40° through a bending fatigue test, hardness test, and residual stress measurement. We found that the case-carburizing formed large hardened layers near ACUTE-END, reduced the compressive residual stress near ACUTE-END, and restricted the improvement of the bending fatigue strength in a meshing state where tooth root stress became large near ACUTE-END. Based on the obtained bending fatigue limits, we revealed that ISO 6336-3:2006 overestimated the rate of increase of the permissible circumferential loads for helix angles exceeding approximately 30°, and ISO/DIS 6336-3:2018 underestimated this rate for helix angles near 30°.
ISSN:1738-494X
1976-3824
DOI:10.1007/s12206-019-1113-4