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5.4 设计计算
已知条件:①传递的功率;②小带轮、大带轮转速;③传动用途、载荷性质、原动机种类以及工作制度。
表14-1-65 设计内容和步骤
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①v≤0.1~0.3m/s且n1≤10r/min时,带所受载荷接近静拉力,Fa可为表中数值的2~4倍(速度愈低,提高愈多)。
②若zm>6,计算时按zm=6代入,其τp、pp可取较大值,zm愈大,τp、pp值愈大。
表14-1-66 工况系数KA(摘自GB/T 11362—2008)
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图14-1-7 周节制、特殊节距制同步带选型图
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图14-1-8 模数制同步带选型图
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图14-1-9 圆弧齿同步带选型图
表14-1-67 小带轮最少齿数zmin
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表14-1-68 中心距调整范围
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注:中心距范围为(a-i1)~(a+s)。
表14-1-69 周节制带的中心距偏差Δa
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图14-1-11 啮合齿数zm线图(特殊节距制)
表14-1-71 周节制带的基准额定功率
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注:为带轮圆周速度在33m/s以上时的功率值,设计时带轮用碳素钢或铸钢。
表14-1-72 特殊节距制带的基准额定功率
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表14-1-73 圆弧齿带的基准额定功率(摘自JB/T 7512.3—1994)
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注:表中粗线以下部分带的寿命要降低。
表14-1-74 周节制带的基准宽度bs0、许用工作拉力Ta及质量m
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表14-1-75 模数制聚氨酯同步带(抗拉层为钢丝绳)的许用拉力和质量
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表14-1-76 圆弧齿带长系数KL
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表14-1-77 模数制聚氨酯同步带的许用压强pp和许用剪切应力τp
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图14-1-12 矢量相加修正系数