プラスチックねじ歯車の歯形摩耗とその影響に関する研究 / 第1報, インボリュートねじ歯車により創成される歯形の理論

抄録

Vibration and noise can be reduced when one of a crossed helical gear pair is made of plastics. Because of the large stress due to the theoretical pointcontact and of the large relative sliding velocity between involute helical gear flanks, the plastic gear wears easily, and is therefore only used for the light load to ward off severe wear. The allowable load should be increased in the case of theoretical line-contact; hence, the study on such a tooth profile was carried out. It is assumed that the shaft angle is 90°, one of the pair is an involute steel helical gear of perfect wear-resistance, and another is a plastic gear which has a tooth profile transferred from the steel gear. The transferred profile is an envelope of the steel tooth flank moving relatively to the fixed plastic gear. The profile depends on the helix angle, and agrees well with the experimental results.