机械设计带轮大作业

1、 设计题目 设计驱动离心鼓风机的V带传动 机械 院（系） 车辆工程 专业班级 093 学号设计人指导教师完成日期 2010 年 5 月 22 日目录一设计任务书····································

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5、183;······13.设计要求··········································&

6、#183;·························14.设计容·······················&

7、#183;············································1二V带传动的设计···

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13、#183;·······································5四主动带轮装配简图设计········&

14、#183;····································61.圆头普通平键设计···········&#

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20、83;··6五小带轮装配图··············································&

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23、#183;····················7设 计 计 算 与 说 明结 果一、设计任务书1.总体布置主动轮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等于大带轮直径的2倍。简图如右图所示2.原始数据电动机型号：Y112M-4鼓风机转速n2(r/min): 1440一天工作时间（h）：163.设计要求（1）绘制小带轮装配图一（2）编写设计计算说明书一份4.设计容（1）V

24、带传动的设计带的型号、根数、长度，带轮尺寸，带传动中心距，作用下周上的压力（2）V带轮的结构设计带轮的材料、结构型式，计算基本结构尺寸等。二、V带传动的设计由已知的电动机型号Y112M-4，查参,可得电动机的额定功率P=4kw,满载转速=1440r/min，传动装置应有的传动比i=1.92，每天工作16小时1.确定计算功率Pc由参考表9-6（p230）查得工作情况系数KA=1.1，故2.选择V带的带型根据Pc和小带轮转速由图9-11（P229）选用A型。3.确定带轮的基准直径并验算带速v（1）初选小带轮的基准直径dd1，由P230的表9-7，可取小带轮的基准直径dd1=150mm。=i

25、5;dd1=288mm再由表9-7基准直径系列选=280mm。取=0.015，则实际传动比i=1.90，传动比偏差为1.04%。（2）验算带速v因为5m/s<v<25m/s，故带速合适。4.确定V带的中心距a和基础长度Ld初选中心距为0.7×（）2×（）。得301860.所以初选=550.由P219的表9-2选带的基准长度Ld=1800mm则实际中心距中心距的变化围527.5608.5mm而题目要求所以取a=560mm，留出适当的中心距调整量。5.验算小带轮上的包角1>符合包角要求6.计算带的根数Z(1)计算单根V带的额定功率由dd1=150mm和=144

26、0r/min，由 P226页的表9-3得P0=2.5kw根据=1440r/min，i=1.92和A型带，由 P227页的表9-5得P0=0.15kw参考书目P227页的表9-4得K=0.968，P219页的表9-2得KL=1.01(2)计算V带的根数z取3根7.计算单根V带的初拉力的最小值（F0）min由参考书目表9-1得A型带的单位长度质量q=0.1kg/m应使带的实际拉力F0>（F0）min8.计算压轴力压轴力的最小值为三、V带轮的结构设计1.带轮的材料由于带速v=11.3m/s<30 m/s，选择HT1502.带轮的结构形式（1）小带轮的结构形式选择小带轮的基准直径dd1=1

27、50mm，其轴孔直径需根据电动机的外伸轴尺寸决定，由机械设计手册查的，安装小带轮轴直径d=28mm，当2.5d300mm时，带轮常采用腹板式带轮结构。取d1=52mm，由参考书目P220页的图9-5查的选择腹板式。（2）大带轮的结构形式选择=280<300mm选择腹板式3.带轮的基本结构尺寸（1）小带轮的基本结构尺寸由参考书目P220页的图 9-5和P218表9-1，得A型带的轮槽尺寸：节宽、基准线上的槽深、基准线下的槽深、槽间距、第一槽对称面至端面的距离轮缘厚、轮槽角带轮宽B=（z-1）×e+2f取、取50mm外径、基准直径带轮孔、(2)大带轮的基本结构尺寸由参考书目P220页的图 9-5和P218表9-1，得A型带的轮槽尺寸：节宽、基准线上的槽深、基准线下的槽深、槽间距、第一槽对称面至端面的距离轮缘厚、轮槽角带轮宽B取、外径、基准直径取带轮孔、四、主动带轮装配简图设计1. 圆头普通平键设计由参考书目P277页的表11-9电动机直径28mm，选择公称直径，公称尺寸，深度轴，毂，取60mm，检验键连接强度：