機(jī)械設(shè)計(jì)課程設(shè)計(jì)二級減速器

一、設(shè)計(jì)任務(wù)二、電的選擇計(jì)

ηη0.97（齒輪精度為80.99（球軸承聯(lián)滾筒傳動總效率 η0.950.9720.9940.990.96所需電功率P總PI/=60n 查表4.12-1,可選Y系列三相異步電Y132S-4,額定功率P0=3KW，同步轉(zhuǎn)速1000r/min;或選Y系列三相異步電Y100L2-4,額定功率額定功率P0=31000r/minP0>Pr號率速速比1—523為使傳動裝置緊湊，決定選用方案1電型號為Y100L2-4.查表得其主要性能如下表電額定功率P0/ 電滿載轉(zhuǎn)速n0/(r/min)電中心高H/mm電軸伸直徑 三、傳動裝置的運(yùn)動及動力參數(shù)的選擇V2—4，取i帶則器動比：i減i/i帶1.351.35ii減12.746 P0PT0=9550×P0/n0=9550×2.7/1420=18.16NmⅠ軸：即器高速P1=P0帶n1=n0/i01=1420/2.5=568r/minT1=9550×P1/n1=9550×2.565/568=43.126NmⅡ軸：即器中間P2=P1·n2=n1/i12=n1/i1=568/4.148=136.93r/minⅢ軸：即器的低速P3=P2·承=2.463×0.97×0.99=2.365kwn3=n2/i23=136.93/3.071=44.588r/minP4=P3·聯(lián)=2.365×0.99·0.99=2.318n4=n3=2.318r/min四、帶傳動的設(shè)計(jì)1、確定設(shè)計(jì)功率電的輸出功率：滿載轉(zhuǎn) ：從動軸轉(zhuǎn) ：568傳動 ：由表3—4，查得：KA=1.1PCKA×P=1.1×2.7=2.97kw2、選取V帶的型 根據(jù)PC和n0由圖3-12確定，因工作點(diǎn)外于A型區(qū)，故選功P/轉(zhuǎn)轉(zhuǎn)傳動比02.2.2.2.3、確定帶輪基準(zhǔn)直徑dd1、dd①選擇小帶輪直徑由表3-5和表3-6確定dd1②驗(yàn)算帶速V= =7.06m/s60dd2=i帶dd1=2.5×95=237.5mm 表3-6取dd2④實(shí)際從動輪轉(zhuǎn)速 和實(shí)際傳動比不計(jì)ε影響，若算得n與預(yù)定轉(zhuǎn)速相差5％ i=dd1dd4、確定中心距a和帶的基準(zhǔn)長度①初定中心0.7(dd2+dd1)≤a0≤2(dd2+dd1)232≤a0≤662取a0=450mm②確定帶的計(jì)算基準(zhǔn)長度Lc按d d L≈2a+( + 0 d 0=1430.71④確定中心距a按式3-aaLcLd=419. amaxa+0.03Ld=461amina-0.015Ld=3985、驗(yàn)算包角≈180°-(dd1dd2a

=159.8°＞12006、確定帶根數(shù)z按式3-Z≥p0=ka(p0+p1+p2)ak=1.25(15180)=1.25(1a

144

L0=1700ω=2n1P ωCc2-C(d)2-Clg(dωd dd

d1 p=C ω 4 110 c4dd1p=c ωlgLd=-L 4 L0p0=ka(p0+p1+p2Z≥Pc=2.97/1.26=2.36Z=37、確定初拉力F0按式3-30F=500Pc2.5-1)+q20

2.510.1 7.063 Q=2F0zsina0=2×119.4×3×sin159.8 五、高速級斜齒圓柱齒輪的設(shè)計(jì)計(jì)算原始數(shù)據(jù)：電的輸出功率：小齒輪轉(zhuǎn) 傳動 小齒輪45調(diào)質(zhì)，硬度217～255HB，取硬度為235—255HB；計(jì)算應(yīng)力循環(huán)次數(shù) (由式5—N=60 N=N/i 查圖5-17得ZN1=1.01,ZN2Zw=1.0，SHlim1=1.0，ZLVR=0.92，ZXHlim1=580Mpa，Hlim2由式(5-28)計(jì)算許用接觸應(yīng)=Hlim1ZZZZ =Hlim2ZZZZH

H

N1XW H

H

N2XWZx1.0a(u1)3KT1(ZZZZ a2 a取 T=9550p1=56454Nm 初取KZ21.3,暫取t估?。簍n bZZH22

22cosb/costsin at(u

u(ZHZZEZ/[H =3.637

20.34

圓整取

mn小齒輪齒數(shù)

=2acosmn(uz24取 實(shí)際傳動比：i

93傳動比誤差：i 100%cosmn(z1z2)/2a2(2393)/(2120)H Hd1mnz1/cos47.585mmd2mnz2/cos192.410mmvn1d16010001.416ms故滿足由5-3按電驅(qū)動，輕度沖擊KAvz/1001.41523/1000.325m/齒寬baa0.3120得：K1.1 查5-4得：K1.2KKAKVKKaaada2d22h*m192.4121.02a端面壓力角：tarctan(tanncosdb2d2cost19241cos20..63at

arccosarccosda

arccos44.53330.31 a

1ztan

tan

tan

at

tan

bsin n

由5-43得：Z cos cosbacrtan(tancost)22coscostsin H

ZEZZ

528.66MPa[H]1(uu由式5-44=2KT2 Y Y≤[

2

Fasa zv1=z1/cos3=23/cos314.83v z=z/cos3=93/cos3v 5-14YFa1=2.71,YFa25-15Ysa1=1.58,Ysa2Y=1- = 0.75cos2Y b

0.75cos2

?。篩st2.0,SFmin Flim1YSTY

F

N1 Flim2YSTY

F

F

N2 =2KT1

bd 1

sa1 1=109MPaF 1 YFa2YsaF F1YFa13=1092.261.78=102.42MPa<3 Z1=23Z2=93 mn=2mmd1=47.585mm

da1=d12h*mada2=d22h*madf1=d1-2.5mndf2=d2-2.5mna ②對于大齒輪，da2<500m六、低速級斜齒圓柱齒輪的設(shè)計(jì)P2=2.463kwn1=136.93r/min，轉(zhuǎn)矩T1=170.780Nm，齒數(shù)比u=3.073小齒輪為45鋼，調(diào)質(zhì)處理，硬度為217—255HB大齒輪為45鋼，正火處理，硬度為190—217HB齒輪精度為8級計(jì)算應(yīng)力循環(huán)次數(shù)N(由式5—N=60njL N=

/i=2.46

=8.025—17zn11.12,zn2取：zw=1.0,SHmin=1.0, =0.92,zx5—16Hmin1=580MPa,Hmin2

Hlim1zSHmin

N1z

zW

=5801.121.00.92[

Hlim2 zz

=5401.191.00.92H2SH2

N2X

33KTZZZ2au H2HEa T=9550p22KtZt2=1.0，暫取13,acos由式5—42z cos5—5ZE估取tn

b2cos2coscostsin223 23 2HEZZ2au H圓整取 mn=(0.01～0.02)t=取標(biāo)準(zhǔn)值：mn1 =2acos=2155cos131mn(u Z1Z2

i實(shí)z1zi

=91100%1.3%β=arccosmnz1z2=arccos23091 2d=mnz1=2.5 1cos d=mn 2.5 cos圓周速度：Vd1n1136.9376.8660 602KT2KTubd1uH=

ZEZZ

≤[H5-3KAVz1齒 b=aab/d25-4KKKAKvKK由5-42z 計(jì)算重合度a以計(jì)zd=d+2h =d+2hma t=arctan(tann= d=dcos b =db =arccosdd1= =arccosdd2=arccos a a=1［z -tan)+z -tan =1[30×tan28.41

=bsin=46.5sin 11Z Z11b=arctan(tancost2cos20.46sinHZ=2cos20.46sinHcosatsin2KT2ubd2u由式2KT2ubd2uH=

ZEZZ221.601197186.9683.693=537.26MPa<[H

=2KT1 Y

Y≤[ bd1

sa v zv1z1cos3=30/cos312.63=32.29zzcos3=91/cos312.63=97.945-14YFa1=2.55,Yv 5-15Ysa1=1.62,Ysa2Y=1- =1-1.29512.63 0.75cos2

0.75cos2Y b 取：Yst2.0,SFmin Flim1YSTY

F

N1 Flim2YSTY

F

F

N2 =2KT1

bd 1

sa1 1=145.58MPa<F 1 YFa2Ysa2 F F1YFa1Z1=30 mn=2.5mmd1=76.86mmda1=

2h*mada2=d22h*madf1=d1-2.5mn=76.868-df2=d2-2.5mn=233.14-a 取b1=46.mm,b2七、軸的設(shè)計(jì)計(jì)1．器高速軸的設(shè)計(jì)計(jì)d1A03 查表（8-2）得：A0=110—160，?。篈0 1353 ×（1+3%）=23.692mm考慮軸端有一個(gè)鍵 ?。篸1帶輪用32mm軸承按標(biāo)準(zhǔn)取6207內(nèi)徑為軸向FaFttan帶對軸的壓軸力

d1df1M2H0

a

265913.8125.3479.8956*682.46NM1H即87Q178R2H122Fr25.3FaR2

87 .4625.3479.89N823.82M1V 178R1v56Ft

561812.85570.25M2V0178R2v122Ft

1221812.5M2v122R1v122570.2569570.5N求軸的彎矩MM1M22HM22HM22

61360.23N46133.922 46133.922M22HOM2233992.2M22HOM2233992.2畫軸的扭矩 T=43126N求計(jì)算彎矩Mca，畫計(jì)算彎矩取根據(jù)McaMcaoMca1

，M120.6TM120.6T61360.2320.643126M22M220.6T83476.920.6M20.6M20.6T77430.6820.6

87395.31N根據(jù) 查得b1=59Ⅰ剖面的計(jì)算應(yīng)力：caW

87395.60.1

11.796MPa〈bⅡ剖面的計(jì)算應(yīng)力：caW

66592.7615.53MPa0.1

判斷剖45B637MPa，1268MPa，1155MPa

0.1minmaxamax m T43126WWT

0.2min ma根 r

50.642d

1.5K2.03K1.680.730.781.8，并取S K 11.796

S K 1.68 1.4550.31.455

S2S 14.71S2S 14.71271.166

14.71

取[S]=1.5～1.8S>[S],八、滾動軸承的選擇和驗(yàn)由《機(jī)械設(shè)計(jì)課程設(shè)計(jì)》查得6207軸承： Cro(靜) R1HR2H=823.82NR1v570.25NR2v1242.27R R R903.52R R R

.27A1= A2A1Cro(靜=479.89NA1R1=479.89N3/1068.41N=0.449〉X1=0.536，Y1A2=0A2/R2 X2=1，Y2fdP1=fd×(X1R1+A1Y1P2=fd×(X2R2+A2Y2P1大于106fc 19800 t 39798h=11年10h60nP 九、鍵聯(lián)接的選擇和驗(yàn)輪轂長為40mm,傳遞轉(zhuǎn)矩T=43126N