同济大学机械设计V带轮设计说明书.docx
- 文档编号:6194702
- 上传时间:2023-01-04
- 格式:DOCX
- 页数:9
- 大小:281.83KB
同济大学机械设计V带轮设计说明书.docx
《同济大学机械设计V带轮设计说明书.docx》由会员分享,可在线阅读,更多相关《同济大学机械设计V带轮设计说明书.docx(9页珍藏版)》请在冰豆网上搜索。
同济大学机械设计V带轮设计说明书
机械设计课程设计
计算说明书
设计题目驱动离心V带鼓风机的传动设计
汽车学院车辆工程专业
班级13级汽车5班
学号1352202
设计人魏斌
指导老师奚鹰
完成日期2015年4月9日
一.设计任务书··········································································································1
二、电动机的选择计算······························································································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······················································4
8.计算压轴力····················································································5
9.主要设计结论····················································································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······································································6
5.其他相关技术要求·········································································6
五、小带轮装配图······································································································7
六、设计小结················································································································7
七、参考文献··············································································································7
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/(r/min)
一天工作时间/h
2
Y112M-4
750
16
3.V带传动设计内容
确定带的型号、长度、根数,带轮直径,带传动中心距,作用在轴上的压力等。
选择带轮的材料、结构形式,计算基本结构尺寸。
二、电动机的选择计算
电动机型号
额定功率
(kW)
满载转速(r/min)
Y112M-4
4.4
1440
由参考文献[1]表20-1得电动机基本参数如上表。
又由[1]表20-2查得电动机主轴直径D=28mm,长度E=60mm,F=8mm,GD=7mm,G=24mm。
三、V带传动设计
设计计算及说明
结果
1.确定计算功率Pca
由参考资料[2]表8-8查得工作情况系数KA=1.1,故
Pca=KAP=1.1×4kW=4.4kW
2.选择V带的带型
根据Pca,n1,由参考资料[2]图8-11选用A型。
3.确定带轮的基准直径dd并验算带速v
1)初选小带轮的基准直径dd1
由参考资料[2]表8-7和表8-9,取小带轮的基准直径
2)验算带速v。
按参考资料[2]式(8-13)验算
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[2]式(8-15a),大带轮直径dd2=idd1=1.92×90mm=172.8mm 根据参考文献[2]表8-9进行圆整,得 。 4.确定V带的中心距a和基准长度Ld 1)根据参考资料[2]式(8-20)及题目要求a约等于2dd2, 初定中心距a0=360mm; 2)由参考资料[2]式(8-22),计算所需的基准长度 + + 由参考资料[2]表8-2选带的基准长度 3)按参考资料[2]式(8-23)计算实际中心距a。 由参考资料[2]式(8-24)知中心距的变化范围为368.2~381.7mm。 5.验算小带轮上的包角 。 ≈164.6>120°合格 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=1440r/min,查参考资料[2]表8-4并利用插值法得: P0=1.064kW, 由i=2,n1=1440r/min和A型带,查参考资料[2]表8-5并利用插值法得: ΔP0=0.1692kW 查参考资料[2]表8-6得Kɑ=0.959,表8-2得KL=0.91,于是 2)计算V带的根数z 取5根。 7.计算单根V带的初拉力F0 查参考资料[2]表8-3得A型带的单位长度质量q=0.105kg/m,所以 8.计算压轴力 9.主要设计结论 选用A型普通V带5根,带基准长度1100mm。 带轮基准直径dd1=90mm,dd2=180mm,中心距控制在a=368~318mm。 单根带初拉力F0=109.04N。 Pca=4.4kW A型带 =164.6° 四、V带轮结构设计 1.V带轮的材料 因为带速 <25m/s,所以选用HT150 2.V带轮的结构形式 小轮选用实心式,大轮选用腹板式。 3.V带轮的槽型 由参考资料[2]表8-11并经适当圆整得 Bd=11.0mm,ha=3mm,hf=9mm,e=15mm,f=10mm,δ=35mm. 小/大带轮: 。 4.V带轮的尺寸 小带轮尺寸 结果 由参考文献[1]图8-14a,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 C’=16mm 5.其他相关技术要求 电动机轴与V带轮配合为 ,由参考资料[1]表14-1知小V带轮所用键 为: 键8×7GB/T1096,配合为 。 由参考资料[1]表13-19知挡圈采用GB892-1986B35,螺栓采用GB/T5783-2000M6×20,垫圈采用GB93-876。 考虑鼓风机工作环境对精度要求不高,故轮槽工作表面粗糙度确定为3.2μm。 同时铸造、焊接或烧结的带轮边缘、腹板、轮辐及轮毂上不允许有砂眼、裂缝、缩孔及气泡;铸造带轮在不提高内部应力的前提下,允许对轮缘、凸台、腹板及轮毂的表面缺陷进行修补。 五、小带轮装配图 见附图 六、设计小结 这是我的第一次机械设计大作业,对我来说意义深刻,它让我初步了解了机械设计的一般流程以及规范,同时也让我领会到了作为一个机械设计师应有的严谨求实的态度。 七、参考文献 [1]李兴华.机械设计课程设计.北京: 清华大学出版社,2013. [2]蒲良贵,陈定国,吴立言.机械设计(第九版).北京: 高等教育出版社,2014.
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 同济大学 机械设计 设计 说明书