1、計算項目計算內容計算結果設計單級直齒圓柱齒輪減速器中的齒輪傳動。已知傳動功率P=7.5kw，小齒輪轉速n1=970r/min，大齒輪轉速n2=250r/min;電動機驅動，工作載荷比較平穩，單向傳動，小齒輪齒數Z1=25。小齒輪選45鋼調質210HBS，大齒輪材料選45鋼正火180HBS。1選材小齒輪 45 調質 210HBS大齒輪 45 正火 180HBS2確定許用應力h f由圖7-23 h1lim=550MPa h2lim=530MPa由圖7-25 f1lim=190MPa f2lim=170MPa設齒輪工作壽命為10年N=10*250*8*60*970=1.164*109由圖7-24 Z

2、n=1由圖7-26 Yn=1由表7-5 Sf=1 Sf=1.35h1=Znh1lim/Sh h2=Znh2lim/Sh =1*550/1 =1*530/1 =550MPa =530MPaf1=Ynf1lim/Sf f2=Ynf2lim/Sf =1*190/1.35 =1*170/1.35 =141MPa =126MPah1=550MPah2=530MPaf1=141MPaf2=126MPa3確定精度等級i=n1/n2=3.88=<5m/s選8級精度i=<5m/s4確定計算載荷T1=9.55*106P/n1 T2=9.55X106P/n2 =9.55*106*7.5/970 =9.5

3、5*106*7.5/250 =7.4*104Nmm =2.865*105NmmT1=7.4X104NmmT2=2.865X105Nmm5定載荷系數由表7-6 K=1由表7-7 Ze=189.8MPaK=1Ze=189.8MPa6確定齒寬系數由表7-8 d=1d=17確定d1d1經公式計算得d1=51.4mm8調整基本參數由題Z1=25 則m=d1/z1 d1=mz1由題m=2.5 =51.4/25 =2.5*25 =2.056 =62.5mmd2=mZ2 =mZ1 =2.5*25*3.88 =242.5mm d1=62.5mmd2=242.5mm9計算齒輪主要尺寸ha1=ha2=ha*m=1*

4、2.5=2.5mmhf1=hf2=ha*+c*m=1+0.25*2.5=3.125mmh1=h2=ha1+hf1=2.5+3.125=5.625mmc1=c2=c*m=0.25*2.5=0.625mmda1=d1+2ha1=62.5+2*2.5=67.5mmda2=d2+2ha1=242.5+2*2.5=247.5mmdf1=d1-2hf1=62.5-2*3.125=56.25mmdf2=d2-2hf1=242.5-2*3.125=236.25mmP1=P2=m=3.14*2.5=7.85mms1=s2=m/2=3.925mme1=e2=m/2=3.925mma=mZ1+Z2/2=2.525+

5、100/2=156.25mmha1=ha2=2.5mmhf1=hf2=3.125mmc1=c2=0.625mmda1=67.5mmda2=247.5mmdf1=56.25mmdf2=236.25mmP1=P2=7.85mms1=s2=3.925mme1=e2=3.925mma=156.25mm10驗算齒輪彎曲強度d=b/d1=1 b=d1=62.5mm由表7-9 Yf1=2.65 Ys1=1.59f1=2KT1/bm2Z1Yf1Ys1<=f1=2*1*7.4*104/62.6*2.52*25*2.65*1.59=63.86MPa<=f1Z2=Z1=25*3.88=97則Z2=100由表7-9 Yf2=2.18 Ys2=1.80f2=2KT2/bm2Z2Yf2Ys2<=f2=2*1*.86