Bending fatigue strength of case-carburized helical gears with large helix angles up to 40 degrees |
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Authors: | Yamaoka Mikiya Tanaka Motomu Kumada Masaya Nojima Kengo Nishi Ryosuke Ono Yuichi Koide Takao |
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Affiliation: | 1.Tottori University, 4-101 Koyama-cho Minami, Tottori, Tottori, 680-8552, Japan ;2.Tottori Institute of Industrial Technology, 1247 Kusaka, Yonago, Tottori, 680-3522, Japan ; |
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Abstract: | 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°. |
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