8-9m半轴、桥壳计算

驱动桥壳强度计算,,,,,

1、传递最大牵引力时桥壳的强度计算,,危险断面在弹簧座处,2401020KAZ,2401020KB2,2401020KBZ

汽车变速时的质量转移系数,m2,,1.2,1.2,1.2

最大载荷,G2,G2=m*9.8,63700,78400,78400

轮距,L,,1650,1800,1800

板簧距,B,,968,1030,1030

车轮中心线到弹簧座中心线的距离,l,l=(L-B)/2,341,385,385

发动机最大转矩,Temax,,405.5,341,415.5

传动系最低档传动比,ik,,10,10,10

主减速比,i0,,4.1,5.286,4.33

传动系效率,ηT,,0.9,0.9,0.9

轮胎滚动半径,rk,,0.445,0.445,0.445

由车轮反作用力T作用在垂直平面内的弯矩,M弯曲,M弯曲=m2*G2*l/2,13033020,18110400,18110400

由牵引力P产生的水平面内的弯矩,M弯平,M弯平=0.6*T*ik*i0*ηT*l/rk,6879594.539,8421239.447,8405303.562

合成弯矩,M弯合,M弯平=（M弯曲2+M弯平2）1/2,14737314.25,19972577.75,19965863.77

桥壳截面尺寸,h,,120,123,120

,H,,134,135,134

,h1,,90,108,98

,H1,,104,120,112

,δ,,14,12,14

,δ1,,14,12,14

垂直平面的抗弯断面系数,W弯曲,W弯曲=（H1*H*H*H-h1*h*h*h)/6H,117804.4975,116384.4,124551.801

水平平面的抗弯断面系数,W弯平,W弯平=（H*H1*H1*H1-h*h1*h1*h1)/6H1,101365.0256,108799.2,112079.3333

桥壳的弯曲应力,σ,σ=M弯曲/W弯曲+M弯平/W弯平,178.5021274,233.0101506,220.3987938

由牵引力产生的反作用扭矩,M扭,M扭=0.6*T*ik*i0*η,8977770,9733640.4,9715221

抗扭断面系数,W扭,W扭=2δ1(H1-δ)(H-δ1),302400,318816,329280

桥壳的扭转应力,τ,τ=M扭/W扭,29.68839286,30.53058943,29.50443695

桥壳合成应力,σA,σA=(σ*σ+3*τ*τ)1/2,185.7611679,238.9353071,226.2458037

许用应力,[σs],,310,245,310

,[σb],,450,410,450

屈服安全系数,fs,fs=[σs]/σA,1.668809491,1.025382155,1.370191159

破坏安全系数,fb,fb=[σb]/σA,2.422465389,1.715945647,1.988987166

,,,,,,

2、汽车制动时桥壳的强度计算,,危险断面在弹簧座处,,,

制动时后桥负荷转移系数,m2',,0.7,0.7,0.7

轮胎附着系数,Ψ,,0.85,0.85,0.85

由车轮反作用力T制作用在垂直平面内的弯矩,M弯曲,M弯曲=m2'*G2*l/2,7602595,10564400,10564400

由制动力P制产生的水平面内的弯矩,M弯平,M弯平=m2'*G2*l*Ψ/2,6462205.75,8979740,8979740

在制动法兰和弹簧座之间的桥壳上承受的制动扭矩,M扭,M扭=m2'*G2*Ψ*rk/2,8433083.75,10379180,10379180

桥壳的弯曲应力,σ,σ=M弯曲/W弯曲+M弯平/W弯平,128.2875227,173.3065973,164.9388262

桥壳的扭转应力,τ,τ=M扭/W扭,27.88718171,32.55539245,31.52083333

桥壳合成应力,σA,σA=(σ*σ+3*τ*τ)1/2,137.0794411,182.2491081,173.7397628

许用应力,[σs],,310,245,310

,[σb],,450,410,450

屈服安全系数,fs,fs=[σs]/σA,2.261462386,1.344313849,1.78427779

破坏安全系数,fb,fb=[σb]/σA,3.282767979,2.249668074,2.590080662

,,,,,,

3、最大侧向力时强度计算,,危险断面在车轮内轴承,,,

侧滑系数,Ψ',,1,1,1

计算公式中见附图,a,,134,140,140

,b,,70,70,70

,c,,64,70,70

车轮外轴承径向力(33113X2),S1,S1=G2(Ψ'*rk-b)/a,178264.9254,210000,210000

车轮内轴承径向力(32214),S2,S2=S1+G2,241964.9254,288400,288400

车轮内轴承弯矩,MA,MA=G2(Ψ'*rk-b),23887500,29400000,29400000

车轮外轴承弯矩,MB,MB=c*MA/a,11408955.22,14700000,14700000

圆周率,π,,3.141592654,3.141592654,3.141592654

轴承断截面见附图,dA,,54,57,57

,DA,,75,80,80

断面面积,HA,,2127.643625,2474.789613,2474.789613

轴承断截面见附图,dB,,54,57,57

,DB,,70,75,75

断面面积,HB,,1558.229956,1866.106036,1866.106036

轴承断面抗弯断面系数,W弯A,W弯A=πDA3（1-dA4/DA4)/32,30287.007,37311.32028,37311.32028

轴承断面抗弯断面系数,W弯B,W弯B=πDB3（1-dB4/DAB4)/33,21748.43811,27599.70828,27599.70828

弯曲应力,σA,σA=MA/W弯A,788.7045425,787.9646118,787.9646118

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

剪切应力,τA,τA=S2/HA,113.7243674,116.5351586,116.5351586

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

弯曲与剪切的合成应力,σA合,σA合=(σA*σA+3*τA*τA)1/2,812.9296099,813.4061464,813.4061464

许用应力,[σs],,815,815,815

,[σb],,885,980,885

屈服安全系数,fs,fs=[σs]/σA合,1.002546826,1.001959481,1.001959481

破坏安全系数,fb,fb=[σb]/σA合,1.088655142,1.204810173,1.08801735

,,,,,,

4、最大垂直力时强度计算,,危险断面在弹簧处,,,

动载荷系数,δ,,2.5,2.5,2.5

最大垂直弯曲力为,T动,T动=T静*δ,,,

最大垂直弯曲力矩为,M动,M动身=G2*δ*l/2,27152125,37730000,37730000

最大弯曲应力,σ动,σ动=M动/W弯,230.4846213,324.1843409,3