例1:已知齿轮轴采用一对621轴承,已知轴承 载荷R1=3500N,Fa1=1606N,R2=2500N,Fa2=0 fp=12,试求P1、P2o 0.28-0.26 0.28 03-0.8085 解:查得:C=29200N 1.03-0.689 ①查e:fFa1/Co=147×1606/29200=0.8085 e1在0.26-0.28之间插值得e1=027 ②求X、Y:Fa,/R1=1606/350=0.459>e ③求P.X=0.56,Y1=1 Fa2=0X,=1,Y,=0 P1=fp(X1R1+Y1Fa1)=1.2(0.56×3500+1.7×1606 =5628N P1>P2∴1轴承危险, P2=fR2=1.2×25003000N计算1的寿命例１：已知齿轮轴采用一对6211轴承，已知轴承 载荷Ｒ1=3500Ｎ，Fa1=1606Ｎ，R2=2500Ｎ，Fa2=０ fP＝1.2，试求P1、P2。 解：查得：C0=29200Ｎ ①查e ： ②求X、Y: ③求Ｐ: f0Fa1 /C0 =14.7×1606/29200 = 0.8085 →e1在0.26~0.28之间,插值得 e1 = 0.27 Fa1 /R1 = 1606/3500 = 0.459＞e X1=0.56 , Y1=1.7 ∵Fa2=0 X2=1 , Y2=0 P1=fP (X1R1+Y1Fa1 )=1.2(0.56×3500+1.7×1606) =5628Ｎ P2=fPR2=1.2×2500=3000Ｎ ∵P1＞P2 ∴１轴承危险， 计算1的寿命 (1.03 0.8085 ) 1.03 0.689 0.28 0.26 1 0.28 − − − e = −