機械構造用合金鋼および窒化鋼製歯車の曲げ疲労強度 : 浸炭歯車,窒化歯車,全体硬化歯車の曲げ疲労試験結果とISO歯車曲げ許容応力値との関係(機械要素,潤滑,工作,生産管理など)

概要

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Tooth strength of case hardened, nitrided or through hardened gears depends on the property and quality of gear material, manufacturing and the heat treatments. When Japanese designs gears, toothbending fatigue strength data for the JIS gear steels is needed. Tooth bending endurance tests for JIS low-alloyed steels for gears and JIS wrought nitriding steels were conducted with pulsator over a six year period. It was found that the tooth bending fatigue strength of the case hardened SNC 815, SCM 420 H and SCM 822 H gears is 500〜824 N/mm^2, 490〜588 N/mm^2 and 392〜530 N/mm^2 respectively. Results for nitrided gears made from 31 CrMo 12 and others and for through hardened gears made from SNCM 439 and SNCM 630 were obtained. The maximum strength value in these tests was 157% of the maximum value of ISO's allowable stress data in case hardened gears, 142% in nitridedgears and 165% in through hardened gears respectively.
2005-05-25