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有一带式制动器，如图8—4所示，制动轮直径D＝400 mm，制动轮宽度B＝75mm，制动轮α＝225°，制动轮与制动带之间的摩擦系数f＝0．3．若作用于制动杠杆上的外力F＝1000 N。制动轮转速n＝200 r／min，m＝50 mm，L＝200 mm。求在外力F＝1000 N下： (1)制动力矩T，制动功率P及此时的紧边拉力F1、拉力F：等于多少?并指出F1及F2的位置? (2)当制动轮转向与图示相反时，求制动力矩T，制动功率P及此时的紧边拉力F1、拉力F2等于多少?并指出F1及F2的位置?[同济大学2010研]
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