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【简答题】
图示为d=80mm的传动轴的外伸臂，转速n=110r/min，传递功率为16PS(马力)，皮带轮直径D=1m，皮带轮重P=2kN。紧边皮带张力等于的三倍，[σ]=70MPa。要求： 按第三强度理论计算容许的外伸臂长度l。
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