查[6]表10.1,确定工作情况系数KA=1.3
Tca =KA*TⅢ = 1.3*4.58*105 = 5.95*105 N*mm
选择HL型弹性柱销联轴器
查[7](P490~509)
按[T]≥Tca = 5.95*105 N*mm
[n]≥10 r/min 查标准GB/T 5014-1995
选用HL4型弹性柱销联轴器
应满足dmin = d12 = d2 ≥ d0min
取dmin = 45 mm
为保证半联轴器轴向定位的可靠性,L12应略小于L1,取L12 = 82 mm
因为d12 = 45 mm ,故取d23 = 50 mm
取d3 4= d78 = 50 mm
查[3],
选用型号为H2050的对开式二螺柱径向滑动轴承
内径d = 50 mm
宽度B = 60 mm
d1 = 135 mm
T1 = 3.4*105 N*mm
Fr = Ft * tgα
压力角
Fr = 5037 * tg = 1833 N
由
得Fax = Fbx = Ft / 2 = 2518.5 N
Fay = Fby = Fr / 2 = 916.5 N
/ 2
= 91650 N*mm
Mcx= Fax * L / 2 = 2518.5 * 200 / 2
= 251850 N*mm
*mm
弯矩产生的扭剪力按脉动循环变化,
取α= 1
图9.2 组合变形图
= 41.2 mm
取d56 = 60 mm
L45应略小于齿轮宽度,取L 56= 96 mm
d45为齿轮左轴肩,故略大于d56
取d45 = 70 mm
由于 d56 > d67 > d78
取d67 = 56 mm
P入 = P电 = 1.1 Kw
P出 = PⅡ = 0.48 Kw
nⅢ = 10 r/min
TⅢ = 4.58*105 N*mm
图10.1轴上零件装配方案
如图所示,大齿轮和小齿轮分别从轴的右侧和左侧安装,为了方便表述,仍记轴的左端面为Ⅰ,并从左向右每个截面变化处依次标记为Ⅱ、Ⅲ、……,对应每轴段的直径和长度则分别记为d12、d23、……和L12、L23、……
材料选择20CrMnTi渗碳,查[6]表11.3确定轴的C值,取C=112
TⅢ = 4.58*105 N*mm
d3 = 210 mm
N
d2 = 405 mm
由于Ft1> Ft2以计算小齿轮处直径d34
Fr = Ft * tgα
压力角
Fr1 = 4361 * tg = 1587 N
Fr2 = 2261 * tg = 822 N
两轴承对称放置
图10.2受力见图
得Fax = 2899 N
Fay = 1055 N
Fbx = 3723 N
Fby = 1354 N
Mcy1 = Fay * L = 1055 * 300 = 316500 N*mm
Mcy2 = Fby * L = 1354 * 100 = 135400 N*mm
Mcx1= Fax * L = 2899 * 300 = 869700 N*mm
Mcx2= Fbx * L = 3723 * 100 = 372300 N*mm
T = 4.58* 105 N*mm
弯矩产生的扭剪力按脉动循环变化,
图10.3组合变形图
= 56 mm
单键槽轴径应增大5%~7%
即增大至58.36 mm ~ 62.44 mm
取d34 = 75 mm
d56 = d34 = 75 mm
L34应小于小齿轮宽度
取L34 = 125 mm
L56应小于大齿轮宽度
取L56 = 90 mm
d45作为齿轮轴向定位的轴肩
取d45 = 90 mm
d23 < d34 取d23 = 70 mm
d67 < d56 取d67 = 70 mm
d12和d78都要放置滑动轴承,因此查[3]
取d12 = d78 = 60 mm
选用型号为H2060的对开式二螺栓径向滑动轴承
根据推荐的取值范围,选择轴承宽径比B/d = 0.7 ~ 1.3
轴承宽度B = (B/d)* d = 1.2 * 50 = 60 mm
查[6]表9.2
选择轴瓦材料铸造铜合金ZCuSn10P1
其许用值为[p] = 15 MPa,[v] = 10 m/s,[pv] = 15 MPa*m/s
满足p < [p],v < [v],pv < [pv]
=0.086 Pa*s
取ρ= 860 kg/m3
ν’=η’/ ρ* 106 = 0.086 / 860* 106
= 100cSt
查[6]表3.1选择全损耗系统用油L-AN100
由[6]图3.7查得50°C时v = 60 cSt
η=ργ*10-6 = 860*60*10-6 = 0.052Pa*s
查[6]表9.9
取χ= 0.31
hmin = r*ψ*(1-x)= 50/2*2.6*10-4(1-0.31)
= 45 μm
按加工精度要求,轴径表面淬火后精磨,表面粗糙度值为0.8,轴瓦孔经精镗,表面粗糙度为1.6 切削式尖头机设计+CAD图纸(11):http://www.youerw.com/jixie/lunwen_1320.html