.85144018.902.6Ⅰ轴2.70553.8546.563.59Ⅱ轴2.63154.28162.802.76Ⅲ轴2.5555.90435.64(3).各轴输入转矩T0=9550Pd/n0=18.90mN?TⅠ=9550PⅠ/nⅠ=46.56mN?TⅡ=9550PⅡ/nⅡ=162.80mN?TⅢ=9550PⅢ/nⅢ=435.64mN?3.3渐开线斜齿圆柱齿轮设计3.3.1高速级斜齿圆柱齿轮设计计算表表3-2高速级斜齿圆柱齿轮项目计算(或选择)依据计算过程单位计算(或确定)结果1.选齿轮精度等级查[1]表10-8选用7级精度级72.材料选择查[1]表10-1小齿轮选用45号钢(调质处理)硬度为250HBS大齿轮选用45号钢(调质处理)硬度为220HBS小齿轮250HBS大齿轮220HBS-6-3.选择齿数Z)40~20(1?Z12iZZ?12ZZU?241?Z取8357.822459.322????ZZ取458.32483??U个122Z=?2Z91?U3.4584.选取螺旋角β20~8=?取=?14度=?145.按齿面接触强度设计(1)试选Kt7.1~3.1=tK取=tK1.6=tK1.6(2)区域系数ZH由[1]图10-3043.2=HZ43.2=HZ(3)εa由[1]图10-26查得εa1=0.77εa2=0.87???21??????1.64???1.64(4)计算小齿轮传递的转矩T1查表14110811.9??TNmm4110811.9??T(5)齿宽系数Фd由[1]表10-715.1~7.0?d??d?1.0(6)材料的弹性影响系数ZE由[1]表10-68.189?EZ21MPa8.189?EZ(7)齿轮接触疲劳强度极限limH?由[1]图10-21c由[1]图10-21d?1limH?550?2limH?540MPa?1limH?550?2limH?540