V带轮设计说明书

机械设计基础课程设计说明书设计题目V带传动设计设计组员李亚霖、吴郅君、刘玲玲、张乐、万学赟院系机电工程学院专业电气工程及其自动化指导教师冯原2目录一．设计任务书··········································································································3二、V带传动设计1.确定计算功率········································································································32.选择V带的带型···································································································33.确定V带的基准直径并验算带速·····································································34.确定V带的中心距和基准长度····································································45.验算小带轮上的包角········································································46.计算带的根数·········································································57.计算带对轴的作用力··············································································5三、V带轮结构设计1.V带轮的材料··························································································52.V带轮的结构形式·······························································63.V带轮的槽型··············································································64.V带轮的尺寸······································································6四、小带轮装配图····································································································6五、参考文献··············································································································63一、设计任务书1.题目：设计由电动机驱动鼓风机的V带传动。如图1所示为传动机结构简图，主动带轮1直接装在电动机轴上，从动轮2装在鼓风机轴上，两带轮中心的水平距离a约于大带轮直径d2的2倍。图12.V带传动设计的原始数据如下：作业题号鼓风机主轴转速n2电动机型号额定功率p/kw满载转速n1主轴直径D/mm主轴轴长E/mm一天工作时间/h5650Y160M-411146042110163.V带传动设计内容选择V带的型号、长度、根数；V带轮的直径、包角、带速；V带传动的中心距，V带对轴的作用力等。二、V带传动设计设计计算及说明1.确定计算功率cP由参考文献[1]表6-4查得工作情况系数A1.3K，故cAPKP1.311kW14.3Kw2.选择V带的带型根据cP14.3kW,1n1460r/min,由参考资料[1]表6-8选用B型带。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1dd4由参考资料[1]表6-5和表6-6，取小带轮的基准直径1d=140d。2)验算带速v111401460m/s60100060100010.70m/s25m/sddnv因为5m/sv25m/s,故带速合适。3)计算大带轮基准直径2dd12121460d140314.46650ddndmmn按表6-6，取2d315d。4）计算大带轮转速n21212140n1460648.9/min315dddnrd误差小于5%，可行。4.确定V带的中心距a和基准长度L1)初步选取0a700mm。2)计算所需的基准长度d0L221d001202()L2()24(315140)2700(140315)247002125.6ddddddaddamm由参考资料[1]表6-2选带的基准长度dL2240mm。3)计算实际中心距a002240-2125.6a=a（700）mm22ddLL=427mm5.验算小带轮上的包角5211(-)=180-57.3a315-140=180-57.3757.2=166.8dddd小轮包角适合。6.计算V带的根数z11Z()cLPPPKK由表6-31P=2.83kw传动比1214602.25648.9nin由表6-71P=0.46kw由表6-2查得LK=1.00由表6-8查得aK0.9714.3Z==4.48（2.83+0.46）10.97取Z=5根。7.计算带对轴的作用力预紧力2c0P2.5F=500(1)aqvzvK查表q0.17/kgm2014.32.5F=500（-1）+0.1710.7510.70.97=230.3N计算带对轴的作用力10166.8F2sin25230.3sin222287.7QzFN三、V带轮结构设计1.V带轮的材料选用HT20062.V带轮的结构形式由于12140300,314.46300dddmmmmdmmmm，因此大带轮选择轮幅式结构，小带轮采用腹板式结构。3.V带轮的尺寸计算b14,17,11,0.17/pmmbmmhmmqkgm4.V带轮轮槽尺寸minb14,3.5,11,19,12.5,7.5,34pafmmhmmhmmemmfmmmm5.主动V带轮的结构尺寸10D89.5,7642,22,70,101,147,140,103,7.5,8kzadcmmdmmmmsmmLmmBmmddDmmmmdmm，d见附图。四、小带轮装配图见附图五、参考文献参考文献[1]——机械设计基础（第四版）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