同济大学机械设计V带轮设计说明书.doc
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同济大学机械设计V带轮设计说明书.doc
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机械设计
(机械设计基础)
课程设计说明书
设计题目驱动离心V带鼓风机的传动
机械工程院(系)机械设计制造及其自动化专业
班级****
学号******
设计人***
指导老师奚鹰
完成日期2013年4月12日
同济大学
0
目录
一.设计任务书··········································································································1
二、电动机的选择·······································································································1
三、V带传动设计
1.确定计算功率·········································································································2
2.选择V带的带型···································································································2
3.确定V带的基准直径并验算带速······································································2
4.确定V带的中心距和基准长度····································································3
5.验算小带轮上的包角········································································3
6.计算带的根数·········································································4
7.计算单根V带的初拉力的最小值····················································4
8.计算压轴力····················································································5
四、V带轮结构设计
1.V带轮的材料··························································································5
2.V带轮的结构形式·······························································5
3.V带轮的槽型··············································································5
4.V带轮的尺寸······································································5
五、小带轮装配图····································································································6
六、设计小结················································································································6
七、参考文献··············································································································7
2
一、设计任务书
1.题目:
设计驱动离心鼓风机的V带传动。
如图所示,主动带轮1装在电动机轴上,从动轮2装在鼓风机轴上,两带轮中心的水平距离a等于大带轮直径D2的2倍。
2.已知条件
作业题号
电动机型号
鼓风机转速n2
一天工作时间(h)
1
Y100L2-4
800
16
3.V带传动设计内容
选择带的型号、确定基准长度、根数、中心距、带轮的材料、基准直径以及结构尺寸、初拉力和压轴力。
二、电动机的选择
电动机型号
额定功率
(kW)
满载转速(r/min)
质量(kg)
Y100L2-4
3
1420
38
由参考文献
(2)表20-1查得电动机主轴直径d=28mm,长度E=60mm。
三、V带传动设计
设计计算及说明
结果
1.确定计算功率Pca
由参考文献[1]表8-7查得工作情况系数KA=1.1,故
Pca=KAP=1.1×3kW=3.3kW
2.选择V带的带型
根据Pca=3.3kW,n1=1420r/min,由参考资料[1]表8-11选用A型。
3.确定带轮的基准直径并验算带速
1)初选小带轮基准直径dd1
由参考资料[1]表8-6和表8-8,取小带轮的基准直径。
2)验算带速v
因为5m/s 3)计算大带轮基准直径dd2 传动比i= 根据参考资料[1]式(8-15a),大带轮直径dd2=idd1=1.775×90mm=159.75mm 根据参考文献[1]表8-8进行圆整,得 。 4.确定V带的中心距a和基准长度L 1)根据参考资[1]式(8-20),初定中心距a0=400mm; 2)由参考资料[1]式(8-22),计算所需的基准长度++ 由参考资料[1]表8-2选带的基准长度 3)按参考资料[1]式(8-23)计算实际中心距 中心距地变化范围为408~464mm。 5.验算小带轮上的包角。 6.计算带的根数z 1)计算单根V带的额定功率Pr。 由dd1=90mm和n1=1420r/min,查参考资料 (1)表8-4a得: P0=1.0532kW, 由i=1.775,n1=1420r/min和A型带,查查参考资料[1]表8-4b得: ΔP0=0.1476kW 查参考资料[1]表8-5得Kɑ=0.98,表8-2得KL=0.93. 2)计算V带的根数z 取4根。 7.计算单根V带的初拉力的最小值 查参考资料[1]表8-3得A型带的单位长度质量q=0.1kg/m,所以 8.计算压轴力 压轴力的最小值为 Pca=3.3kW A型带 四、V带轮结构设计 1.V带轮的材料 选用HT150或HT200 2.V带轮的结构形式 由于,因此大带轮和小带轮均采用腹板式。 3.V带轮的槽型 小带轮: ;大带轮: 。 4.V带轮的尺寸 小带轮尺寸 结果 由参考文献[1]图8-14b,可知: ,故取 , 由参考文献[2]表9-1,可知 大带轮尺寸 结果 由参考文献[1]图8-14b,可知: ,故取 , 由参考文献[2]表9-1,可知 五、小带轮装配图 见附图 六、设计小结 第一次拿到V带传动的设计大作业时,感觉无从下手,只能慢慢复习课本知识,从书本上逐步摸索机械设计的步骤,写设计书,又用CAD画装配图,花了不少时间和精力,查了许多资料,终于把V带传动的设计做好了。 在这个过程,学到了很多,知道了怎么去解决机械设计中的问题,也懂得了怎样去设计。 也激发了我对机械设计的兴趣。 七、参考文献 参考文献[1]——机械设计(第八版)高等教育出版社 参考文献[2]——机械设课程设计高等教育出版社 6
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