【正文】 =Flim1YN1 Yx / SFlim =669MPa [F2] =Flim2YN2Yx/ SFlim =659MPa驗算F1 F1 =2KT1YF1YS1Y/bd1m =587MPa F2 =F1 YF2YS2 / YF1 YS1 =570MPa計算結(jié)果表明齒輪的彎曲疲勞強度滿足要求 XIV軸的設(shè)計驗算由上可知， Ft1 =2 T2/d5=4182N，F(xiàn)r1= Ft1tan=1522N Ft2 =2 T2/d11=3952N，F(xiàn)r2= Ft2tan=1438N1 計算支反力 水平面 R1=(1522170+143820)/250=1150N R2=1522+14381150 =1810N垂直面 R1=(4182170+395220)/250 =2528N R2=2528+39524182=2298N M= =222182 Nmm許用應(yīng)力值 ，[ob]=150 [1b]=90應(yīng)力校正系數(shù) =[1b] /[ob]=90/150= MD= =229954 Nmm2 校核軸徑齒根圓直徑 df1 = d1 2(ha +c) mn=mm軸徑 = = = =28mm所以軸徑滿足要求。由前面設(shè)計可知齒輪的齒數(shù)Z7=28，模數(shù)m=，Z8=28，則可知d7=63mm，d8 =63mm3 齒面接觸疲勞強度驗算圓周速度v v=πd7 n2/601000=齒寬系數(shù)d ，取d =1齒寬 b= dd7 =163=63mm精度等級 選8級載荷系數(shù)K K= KA KV KHKH （）使用系數(shù)KA ，KA =動載系數(shù)KV ，KV =齒間載荷分配系數(shù)KH ，先求 Ft =2 T2/d7 =3136 KA Ft/b=100 =[(1/ Z7 +1/ Z8)]cos = Z= =由此得 KH=1/ Z=齒向載荷分配系數(shù)KH KH =A+B (b/d)+Cb =由此得 K= KA KV KHKH = =彈性系數(shù)ZE ，ZE =節(jié)點區(qū)域系數(shù)ZH ，ZH =接觸最小安全系數(shù)SHmin ，SHmin=總工作時間th th =103008 =4800h應(yīng)力循環(huán)次數(shù)NL ，估計 NL, 則指數(shù)m= NL1= Nv1 =60nithi (Ti/Tmax ) （） =原估計應(yīng)力循環(huán)次數(shù)正確NL2 = NL1/i=接觸壽命系數(shù)ZN ，NL1 = NL2 =許用接觸應(yīng)力[H] [H1] =Hlim1 NL1 / SHmin （） =1547MPa [H2] =Hlim2 NL2/ SHmin =1478MPa驗算H H =ZE ZH Z （） = =764MPa [H2]計算結(jié)果表明齒輪的接觸疲勞強度滿足要求。4 齒根彎曲疲勞強度驗算重合度系數(shù)Y Y=+ =齒間載荷分配系數(shù)KF ，KF=1/ Y=齒向載荷分配系數(shù)KF ，KF=載荷系數(shù)K K= KA KV KFKF =齒形系數(shù)YF ， YF1= YF2 =應(yīng)力修正系數(shù)YS ，YS1= YS2=彎曲疲勞極限Flim ，F(xiàn)lim1 =920MPa Flim2 =850MPa彎曲最小安全系數(shù)SFlim ，SFlim =彎曲壽命系數(shù)YN ，YN1 = YN2 =尺寸系數(shù)Yx ，Yx =1許用彎曲應(yīng)力[F] [F1] =Flim1YN1 Yx / SFlim =669MPa [F2] =Flim2YN2Yx/ SFlim =659MPa驗算F1 F1 =2KT1YF1YS1Y/bd7m =332MPa F2 =F1 YF2YS2 / YF1 YS1 =323MPa計算結(jié)果表明齒輪的彎曲疲勞強度滿足要求 XV軸上齒輪的設(shè)計驗算由前面設(shè)計可知齒輪的齒數(shù)Z11=18，模數(shù)m=2，Z12=45，則可知d1=36mm，d2 =90mm1 齒面接觸疲勞強度驗算轉(zhuǎn)速n3 n3 = n2 =450 r/min功率P3 P3 = P2=轉(zhuǎn)矩T3 T3 =P/ n3 =接觸疲勞極限Hlim 得，Hlim1 =1250MPaHlim2 =1150MPa圓周速度v v=πd11 n3 /601000=齒寬系數(shù)d ，取d =1齒寬 b= dd11 =136=36mm精度等級 選8級載荷系數(shù)K K= KA KV KHKH （）使用系數(shù)KA ，KA =動載系數(shù)KV ，KV =齒間載荷分配系數(shù)KH ，先求 Ft =2 T3/d11 =5489 KA Ft/b=100 =[(1/ Z11 +1/ Z12 )]cos = Z= =由此得 KH=齒向載荷分配系數(shù)KH KH =A+B (b/d)+Cb =由此得 K= KA KV KHKH = =彈性系數(shù)ZE ，ZE =節(jié)點區(qū)域系數(shù)ZH ，ZH =接觸最小安全系數(shù)SHmin ，SHmin=總工作時間th th =103008 =4800h應(yīng)力循環(huán)次數(shù)NL ，估計 NL, 則指數(shù)m= NL1= Nv1 =60nithi (Ti/Tmax ) （） =原估計應(yīng)力循環(huán)次數(shù)正確NL2 = NL1/i=接觸壽命系數(shù)ZN ，NL1 = NL2 =許用接觸應(yīng)力[H] [H1] =Hlim1 NL1 / SHmin （）