Bending Strength Design of Thin-Rimmed Helical Gears with Various Web Arrangements

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Root stresses of thin-rimmed helical gears with web arrangement were measured, and then effects of rim and web thicknesses and web structure on root stress in meshing process, the maximum root stress and the worst meshing position were determined. Bending fatigue tests were carried out for the thin-rimmed helical gear meshed at the worst meshing position, and then S-N curves and bending fatigue limit loads were obtained. The main results obtained are summarized as follows. (1)Th worst meshing posiition of thin-rimmed helical gear is near the outer point of single tooth pair contact in the case of of small helix angle and is the backward position a little from the pitch point of the end of face width of leading side in the case of large helix angle. (2) The bending fatigue strength of thin-rimmed helical gear has not a influence of web position in the case of thin rim and web, and the effect of helix angle is also considerably small compared with the case of root stress.