蜗轮分度圆直径d2?mz2?6.3?40?252mm 喉圆直径da2?d2?2ha2?252?2?6.3?264.6mm 齿根圆直径df2?d2?2hf2?252?2?1.2?6.3?236.88mm 咽喉母圆半rg2?a?涡轮齿顶高 ha2?1da2?191.5?0.5?264.66?59.2mm2 1?(da2?d2)?6.3 22.5校核齿根弯曲疲劳强度 ?F?1.53KT2YFa2Y????F? d1d2Z2?40.15 3cos?当量齿数 Zv=Z2/cosZv?从图11-9中可查得齿形系数YFa2=2.44 螺旋角系数：Y??1?5.43?0.961 140许用弯曲应力： 从表11-8中查得有ZCuSn10P1制造的蜗轮的基本许用弯曲应力[?F]'=56MPa 寿命系数 KFN?91061.8?107=0.725 [?F]?[?F]'*kFn=56*0.725=40.6MPa 1.53?1.21?5519101.53kT2?F?YFa2*Y?[?F]=?2.44?0.961?22.795MPa d1*d2*m63?258.3?63可以得到：?F