8-9m半軸、橋殼計(jì)算

驅(qū)動(dòng)橋殼強(qiáng)度計(jì)算,,,,,

1、傳遞最大牽引力時(shí)橋殼的強(qiáng)度計(jì)算,,危險(xiǎn)斷面在彈簧座處,2401020KAZ,2401020KB2,2401020KBZ

汽車變速時(shí)的質(zhì)量轉(zhuǎn)移系數(shù),m2,,1.2,1.2,1.2

最大載荷,G2,G2=m*9.8,63700,78400,78400

輪距,L,,1650,1800,1800

板簧距,B,,968,1030,1030

車輪中心線到彈簧座中心線的距離,l,l=(L-B)/2,341,385,385

發(fā)動(dòng)機(jī)最大轉(zhuǎn)矩,Temax,,405.5,341,415.5

傳動(dòng)系最低檔傳動(dòng)比,ik,,10,10,10

主減速比,i0,,4.1,5.286,4.33

傳動(dòng)系效率,ηT,,0.9,0.9,0.9

輪胎滾動(dòng)半徑,rk,,0.445,0.445,0.445

由車輪反作用力T作用在垂直平面內(nèi)的彎矩,M彎曲,M彎曲=m2*G2*l/2,13033020,18110400,18110400

由牽引力P產(chǎn)生的水平面內(nèi)的彎矩,M彎平,M彎平=0.6*T*ik*i0*ηT*l/rk,6879594.539,8421239.447,8405303.562

合成彎矩,M彎合,M彎平=（M彎曲2+M彎平2）1/2,14737314.25,19972577.75,19965863.77

橋殼截面尺寸,h,,120,123,120

,H,,134,135,134

,h1,,90,108,98

,H1,,104,120,112

,δ,,14,12,14

,δ1,,14,12,14

垂直平面的抗彎斷面系數(shù),W彎曲,W彎曲=（H1*H*H*H-h1*h*h*h)/6H,117804.4975,116384.4,124551.801

水平平面的抗彎斷面系數(shù),W彎平,W彎平=（H*H1*H1*H1-h*h1*h1*h1)/6H1,101365.0256,108799.2,112079.3333

橋殼的彎曲應(yīng)力,σ,σ=M彎曲/W彎曲+M彎平/W彎平,178.5021274,233.0101506,220.3987938

由牽引力產(chǎn)生的反作用扭矩,M扭,M扭=0.6*T*ik*i0*η,8977770,9733640.4,9715221

抗扭斷面系數(shù),W扭,W扭=2δ1(H1-δ)(H-δ1),302400,318816,329280

橋殼的扭轉(zhuǎn)應(yīng)力,τ,τ=M扭/W扭,29.68839286,30.53058943,29.50443695

橋殼合成應(yīng)力,σA,σA=(σ*σ+3*τ*τ)1/2,185.7611679,238.9353071,226.2458037

許用應(yīng)力,[σs],,310,245,310

,[σb],,450,410,450

屈服安全系數(shù),fs,fs=[σs]/σA,1.668809491,1.025382155,1.370191159

破壞安全系數(shù),fb,fb=[σb]/σA,2.422465389,1.715945647,1.988987166

,,,,,,

2、汽車制動(dòng)時(shí)橋殼的強(qiáng)度計(jì)算,,危險(xiǎn)斷面在彈簧座處,,,

制動(dòng)時(shí)后橋負(fù)荷轉(zhuǎn)移系數(shù),m2',,0.7,0.7,0.7

輪胎附著系數(shù),Ψ,,0.85,0.85,0.85

由車輪反作用力T制作用在垂直平面內(nèi)的彎矩,M彎曲,M彎曲=m2'*G2*l/2,7602595,10564400,10564400

由制動(dòng)力P制產(chǎn)生的水平面內(nèi)的彎矩,M彎平,M彎平=m2'*G2*l*Ψ/2,6462205.75,8979740,8979740

在制動(dòng)法蘭和彈簧座之間的橋殼上承受的制動(dòng)扭矩,M扭,M扭=m2'*G2*Ψ*rk/2,8433083.75,10379180,10379180

橋殼的彎曲應(yīng)力,σ,σ=M彎曲/W彎曲+M彎平/W彎平,128.2875227,173.3065973,164.9388262

橋殼的扭轉(zhuǎn)應(yīng)力,τ,τ=M扭/W扭,27.88718171,32.55539245,31.52083333

橋殼合成應(yīng)力,σA,σA=(σ*σ+3*τ*τ)1/2,137.0794411,182.2491081,173.7397628

許用應(yīng)力,[σs],,310,245,310

,[σb],,450,410,450

屈服安全系數(shù),fs,fs=[σs]/σA,2.261462386,1.344313849,1.78427779

破壞安全系數(shù),fb,fb=[σb]/σA,3.282767979,2.249668074,2.590080662

,,,,,,

3、最大側(cè)向力時(shí)強(qiáng)度計(jì)算,,危險(xiǎn)斷面在車輪內(nèi)軸承,,,

側(cè)滑系數(shù),Ψ',,1,1,1

計(jì)算公式中見附圖,a,,134,140,140

,b,,70,70,70

,c,,64,70,70

車輪外軸承徑向力(33113X2),S1,S1=G2(Ψ'*rk-b)/a,178264.9254,210000,210000

車輪內(nèi)軸承徑向力(32214),S2,S2=S1+G2,241964.9254,288400,288400

車輪內(nèi)軸承彎矩,MA,MA=G2(Ψ'*rk-b),23887500,29400000,29400000

車輪外軸承彎矩,MB,MB=c*MA/a,11408955.22,14700000,14700000

圓周率,π,,3.141592654,3.141592654,3.141592654

軸承斷截面見附圖,dA,,54,57,57

,DA,,75,80,80

斷面面積,HA,,2127.643625,2474.789613,2474.789613

軸承斷截面見附圖,dB,,54,57,57

,DB,,70,75,75

斷面面積,HB,,1558.229956,1866.106036,1866.106036

軸承斷面抗彎斷面系數(shù),W彎A,W彎A=πDA3（1-dA4/DA4)/32,30287.007,37311.32028,37311.32028

軸承斷面抗彎斷面系數(shù),W彎B,W彎B=πDB3（1-dB4/DAB4)/33,21748.43811,27599.70828,27599.70828

彎曲應(yīng)力,σA,σA=MA/W彎A,788.7045425,787.9646118,787.9646118

,σB,σB=MB/W彎B,524.5873367,532.6143252,532.6143252

剪切應(yīng)力,τA,τA=S2/HA,113.7243674,116.5351586,116.5351586

,τB,τB=S1/HB,114.4021937,112.5337981,112.5337981

彎曲與剪切的合成應(yīng)力,σA合,σA合=(σA*σA+3*τA*τA)1/2,812.9296099,813.4061464,813.4061464

許用應(yīng)力,[σs],,815,815,815

,[σb],,885,980,885

屈服安全系數(shù),fs,fs=[σs]/σA合,1.002546826,1.001959481,1.001959481

破壞安全系數(shù),fb,fb=[σb]/σA合,1.088655142,1.204810173,1.08801735

,,,,,,

4、最大垂直力時(shí)強(qiáng)度計(jì)算,,危險(xiǎn)斷面在彈簧處,,,

動(dòng)載荷系數(shù),δ,,2.5,2.5,2.5

最大垂直彎曲力為,T動(dòng),T動(dòng)=T靜*δ,,,

最大垂直彎曲力矩為,M動(dòng),M動(dòng)身=G2*δ*l/2,27152125,37730000,37730000

最大彎曲應(yīng)力,σ動(dòng),σ動(dòng)=M動(dòng)/W彎,230.4846213,324.1843409,3