机械设计带轮大作业

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·······················································1

1.

总

体

布数要内

置····································································1 2.原始据····································································1 3.设计求····································································1 4.设计容····································································1

二．V带传动的设计··················································1 三．V带的结构设计···················································4

1.

带

轮

的

材形尺

料··································································4 2.带轮的结构式······························································5 3.带轮的基本结构寸··························································5

四．主动带轮装配简图设计·············································6

1.

圆

头

普

通

平

键

设设设垫

计····························································6 2.轴端挡圈计································································6 3.螺栓计····································································6 4.弹簧圈····································································6

五．小带轮装配图····················································6 六．设计小结························································6 七．参考资料·························································7

设 计 计 算 及 说 明 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 结 果 电动机型号：Y112M-4 鼓风机转速n2(r/min): 1440 一天工作时间（h）：16 3.设计要求 （1）绘制小带轮装配图一张 （2）编写设计计算说明书一份 4.设计内容 （1）V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。 n2=1440 r/min 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 P=4kw 转速n1=1440r/min，传动装置应有的传动比i=1.92，每天工作16小时 n1=1440r/min 1.确定计算功率Pc i=1.92 由参考表9-6（p230）查得工作情况系数KA=1.1，故 Pca?KAP?1.1?4?4.4(kw) KA=1.1 2.选择V带的带型 Pc=4.4 kw 根据Pc和小带轮转速n1由图9-11（P229）选用A型。 A型 3.确定带轮的基准直径dd1,dd2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。 dd2=i×dd1=288mm再由表9-7基准直径系列选dd2=280mm。取?=0.015， dd2则实际传动比i==1.90，传动比偏差为1.04%。 dd1=150 dd1?(1??)（2）验算带速v V??dd1n160?1000???150?1440m60?1000?11.3m ssv=11.3m/s 因为5m/s1200 a560 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?P0? 由dd1=150mm和n1=1440r/min，由 P226页的表9-3得P0=2.5kw Pr=1.11kw 根据n1=1440r/min，i=1.92和A型带，由 P227页的表9-5得 ΔP0=0.15kw 参考书目P227页的表9-4得Kα=0.968，P219页的表9-2得KL=1.01 z=3 Pr??(P0??P0)?K??KL?(2.5?0.15)?0.968?1.01?kw?2.59kw (2)计算V带的根数z Pc4.4z???2.59 ?P0?1.7 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 （F0）min=115.5N (2.5?K?)Pc2(F0)min?500?qv K?zv (2.5?0.968)?4.4 ?[500??0.1?11.32]N?115.5N 0.968?3?11.3FQ（）应使带的实际拉力F0>（F0）min 8.计算压轴力FQ min=688.5N 压轴力的最小值为 L?Ld01318.9?1250a?a0?d?(550?)mm?554.5mm 22a=560mm (FQ)min 材料：HT150 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HT150 2.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=150mm，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， 小带轮结构： d1?(1.8~2)d?(1.8~2)?28mm?50.4~56mm 腹板式式 当2.5d≤dd≤300mm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dd2=280<300mm 选择腹板式 3.带轮的基本结构尺寸 大带轮结构： （1）小带轮的基本结构尺寸 腹板式 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bd?11.0mm、基准线上的槽深ha?3mm、 基准线下的槽深h0?12mm、槽间距e?15mm、 bd=11.0mm 第一槽对称面至端面的距离fmin?10mm ha=3mm h0=12mm 0轮缘厚?min=6mm、轮槽角??38 e=15mm fmin =10mm 带轮宽B=（z-1）×e+2f取50mm、L?(1.5~2)?d取50mm δmin=6mm ψ=38° 外径da1?dd1?2ha?156mm、基准直径dd1?150mm B=50mm L=50mm 带轮孔d?28mm、d1?52mm da1=150mm dd1=156mm (2)大带轮的基本结构尺寸 d=28mm 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： d1=50mm 节宽bd?11.0mm、基准线上的槽深ha?3mm、 基准线下的槽深h0?12mm、槽间距e?15mm、 第一槽对称面至端面的距离fmin?10mm ???1670???2z(F0)minsin?2?3?115.5?sin?N?688.5N 22??