設(shè)計(jì)直齒圓柱齒輪

1、計(jì)算項(xiàng)目計(jì)算內(nèi)容計(jì)算結(jié)果設(shè)計(jì)單級(jí)直齒圓柱齒輪減速器中的齒輪傳動(dòng)。已知傳動(dòng)功率P=7.5kw，小齒輪轉(zhuǎn)速n1=970r/min，大齒輪轉(zhuǎn)速n2=250r/min;電動(dòng)機(jī)驅(qū)動(dòng)，工作載荷比較平穩(wěn)，單向傳動(dòng)，小齒輪齒數(shù)Z1=25。小齒輪選45鋼調(diào)質(zhì)210HBS，大齒輪材料選45鋼正火180HBS。1選材小齒輪 45 調(diào)質(zhì) 210HBS大齒輪 45 正火 180HBS2確定許用應(yīng)力h f由圖7-23 h1lim=550MPa h2lim=530MPa由圖7-25 f1lim=190MPa f2lim=170MPa設(shè)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(jí)i=n1/n2=3.88=<5m/s選8級(jí)精度i=<5m/s4確定計(jì)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(shù)由表7-6 K=1由表7-7 Ze=189.8MPaK=1Ze=189.8MPa6確定齒寬系數(shù)由表7-8 d=1d=17確定d1d1經(jīng)公式計(jì)算得d1=51.4mm8調(diào)整基本參數(shù)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(jì)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(yàn)算齒輪彎曲強(qiáng)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