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简答题 一轴由一对7211AC的轴承支承,Fr1=3300N,Fr2=1000N,Fx=900N,如图。试求两轴承的当量动载荷P。(S=0.68Fr,e=0.68,X=0.41,Y=0.87)
  • S=0.68Fr  
    S1=0.68Fr1=0.68×3300N=2244N 
    S2=0.68Fr2=0.68×1000N=680N 
    S2+Fx=680+900=1580N1=S1=2244N 
    Fa2=S1-Fx=2244-900=1344N 
    Fa1/Fr1=2244/3300=0.68=e 
    Fa2/Fr2=1340/1000=1.344>e 
    P1=3300N 
    P2 = 0.41×1000+0.87×1344=1579N
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