前后制动力比值 平同路面士制 求线组:Fb=mgq Fxbl=oF=o gL 2+ ong /, F.nh b + Fxb= Fxbl+ Fxb2 F21/ mgL, (Fxbl+ Fxb2)h F xbl L L-oh F b1 mg xb2 xbl M6合K<NN9/16 ( ) g xb g g xb xb xb g xb xb xb xb xb g xb z g xb h mgL F h L h F L F F h L mgL F F F F L F h L mgL L h L mg F F f F mg 2 2 1 2 1 2 1 1 2 2 1 1 2 ( ) − − =         + = + = +         = = + = + =        求 线组：  Fxb1 Fxb2 (0, ) 2 g h mgL −