●2计算轴向力 F=900N 由手册C=24.8kN,e=0.36,Y=1.7 R R R 1552 456N R 1701 2Y2×1.7 S2 =500N 2Y2×1.7 轴承放松:轴向力A1=Fs1=456N 轴承压紧:轴向力A2=Fa+Fs1=1356N ●3.计算当量动载荷 A,456 =0.29≤e X=14=1356=0802e=04 R,1552 R、1701 Y=17 P1=fpR1=1.5×1552=2328N P2=fp(XR2+YA2)=1.5(0.4×1701+1.7×1356)=4478N ●4计算寿命 10°C 1666724800 L 2 10/3 =13010h 60n 2 385447819 轴承 放松：轴向力 A1= FS1 =456N 轴承 压紧：轴向力A2 = Fa + FS1 =1356N ⚫ 3.计算当量动载荷 R1 R2 FS1 Fa=900N FS2 N Y R FS 456 2 1.7 1552 2 1 1 =  = = N Y R FS 500 2 1.7 1701 2 2 2 =  = = P1=fPR1=1.51552=2328N P2=fP (X R2 +Y A2 ) =1.5 (0.4  1701+1.7  1356)=4478N ⚫ 2.计算轴向力 由手册 C=24.8kN，e=0.36，Y=1.7 ； 0 1 0.29 1552 456 1 1 = = = =   Y X e R A 1.7 0.4 0.80 1701 1356 2 2 = = = =   Y X e R A ⚫ 4.计算寿命 h P C n L ) 115155 2328 24800 ( 385 16667 ( ) 60 10 1 0/ 3 1 6 1 = = =  h P C n L ) 13010 4478 24800 ( 385 16667 ( ) 60 10 1 0/ 3 2 6 2 = = = 