15 =︒
⨯︒︒⨯4103.20sin 4103.20cos 2665.11cos 2=2.47 α ≥(u+1)[]3222⎪⎪⎭
⎫ ⎝⎛H E H a Z Z Z Z u KT σφβε =()3260999.08.18947.23.335.021485700.1116.3⎪⎭
⎫ ⎝⎛⨯⨯⨯⨯⨯⨯+=152.748mm 圆整取: α=155mm
6.3 匹配参数
一般取: n m =(0.01~0.02)t α= (0.01~0.02)×155=1.55~3.1 取标准值: n m =2mm 两齿轮齿数和 : ∑z
=n m cos a 2β=0.212cos 1552︒⨯⨯=151.6 取:∑z =152 Z 1=∑z /(u+1)=
13.3152+=35.3 取:Z 1=35
Z 2= ∑z -z1=152-35=117 实际传动比: 1z 2
z i =实=35117=3.343 传动比误差: %3.1%100i i i =⨯-=
∆理实理i <5% 故在范围内。 修正螺旋角 :
β=arccos ()a 2z z m 21n += arccos ()155
2117355.2⨯+⨯=11.29110 "28'1711︒= 与初选 接近,H Z ,βZ 不可修正
1d =β
cos m 1n z =︒⨯2911.11cos 350.2=71.382mm