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[主观题]
一普通螺栓,已知:大径d=20mm,中径d2=18.376mm,小径d1=17.294 mm,螺距P=2.5mm,螺纹线数n=2,牙型角α=60°,螺纹
一普通螺栓,已知:大径d=20mm,中径d2=18.376mm,小径d1=17.294 mm,螺距P=2.5mm,螺纹线数n=2,牙型角α=60°,螺纹副的摩擦系数f=0.14。试求:(1) 螺栓的导程S;(2) 螺纹的升角λ;(3) 当以螺纹副作传动时,其举升和降低重物的效率;(4) 此螺旋副的自锁性如何?
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