中硬度調質歯車の負荷能力に関する研究 : 第5報,歯面強さに及ぼす歯数比と粗さの影響

概要

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The surface durability of hardened and tempered gears (HB<sime>340) having a gear ratio of u≠1 was investigated by using a power circulating-type gear testing machine. The test results reveal that the gear ratio has a great influence on surface durability in the case of gears with rough tooth surfaces, such as hobbed gears. The endurance limit of medium-hardness gears is summarized as follows : Under the condition of rough initial tooth surface, (i) P_<max><sime>0.1 HB kgf/mm^2 in the case where the gear ratio u is not unity, (ii) P_<max><sime>0.2 HB kgf/mm^2 in the case that u equals unity. But, if the initial tooth surface is very smooth, (iii) P_<max><sime>0.3 HB kgf/mm^2 regardless of the gear ratio. In conclusion, the tooth surface should be finished as smoothly as possible in order to obtain a high load-carrying capacity because the influence of roughness is more remarkable in conventional gears having a gear ratio of u≠1.
社団法人日本機械学会の論文
1986-11-25