ウォーム状工具および成形砥石で歯筋修整したはすば歯車歯形の計算法

概要

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When a helical gear with a tooth-trace modification (crowning) is finished by a worm-shaped tool or a form grinding wheel, its tooth surface becomes a biased one which suffers changes in profile along its transverse section. In this report, a new method which can calculate the tooth profile with a tooth-trace modification is proposed. This method is applicable to a helical gear with an arbitrary tooth profile. The differences between profiles with a tooth-trace modification and those without it in the same transverse section of the gear were calculated and three-dimensional changes in the tooth profiles were expressed by means of a contour map. In the case of using a worm-shaped tool, when a slight compensation is made on the center distance between the gear axis and the tool axis while the tool is fed along the gear axis, the biased tooth surface whose helical overlap contact ratio is not exceedingly small is obtained. However, the helical gear finished by a form grinding wheel has its surface biased in the opposite direction, whose helical overlap contact ratio is small.
一般社団法人日本機械学会の論文
1995-03-25