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1、机械设计课程设计计算说明书机械工程分院机械设计专业全套图纸,加15389370600212班33号设计者: 指导教师: 2003年7月沈阳工业学院 目 录一¸ 设计任务书···································
2、··················································
3、···2二¸ 电机的选择计算1. 择电机的转速···········································
4、;······································22. 工作机的有效功率··········
5、;··················································
6、;···············23. 选择电动机的型号·································
7、;··········································3三¸ 运动和动力参数的计算1. 分配传动比···
8、183;·················································
9、183;······························32. 各轴的转速··················
10、;··················································
11、;················33. 各轴的功率································
12、183;·················································
13、183;·44. 各轴的转矩···············································
14、;······································4四¸ 传动零件的设计计算1. 闭式直齿轮圆锥齿轮传动的设计计算·····
15、3;···········································42. 闭式直齿轮圆柱齿轮传动的设计计算···
16、183;·············································6五¸ 轴的设计计算4. 减速器高速轴i的
17、设计·················································
18、3;···················95. 减速器低速轴ii的设计····························&
19、#183;·····································113. 减速器低速轴iii的设计·········
20、183;·················································
21、183;······14六¸ 滚动轴承的选择与寿命计算1.减速器高速i轴滚动轴承的选择与寿命计算····································&
22、#183;····162.减速器低速ii轴滚动轴承的选择与寿命计算········································173. 减速
23、器低速iii轴滚动轴承的选择与寿命计算·····································18七¸ 键联接的选择和验算1. 联轴器与高速轴轴伸的键联接····
24、··················································
25、····192. 大圆锥齿轮与低速轴ii的的键联接··········································
26、83;·········193. 大圆柱齿轮与低速轴iii的的键联接·····································
27、;·············20八¸ 润滑油的选择与热平衡计算1. 减速器的热平衡计算·······························&
28、#183;·········································212. 润滑油的选择······
29、183;·················································
30、183;························22九¸ 参考文献·······················
31、··················································
32、···············23 1.计算内容计算结果一对圆锥滚子轴承的效率 3= 0.98一对球轴承的效率 4= 0.99闭式直齿圆锥齿传动效率5= 0.95闭式直齿圆柱齿传动效率6= 0.97b. 总效率=12 23 3456=0.96×0.992 ×0.983 ×0.99×0.95×0.97=0.808c. 所需电动机的输出功率 pr=pw/=2.4/0.808=3kw3. 选择电动机的型
33、号 查参考文献1表4-12.2 得 表1.1方案号电机类型额定功率同步转速满载转速总传动比 1y100l2-431500142022.294 2y132s-63100096015.072根据以上两种可行同步转速电机对比可见,方案2传动比小且质量价格也比较合理,所以选择y132s-6型电动机。三, 动和动力参数的计算6. 分配传动比(1) 总传动比i=15.072(2) 各级传动比:直齿轮圆锥齿轮传动比 i12=3.762, 直齿轮圆柱齿轮传动比 i23=4(3) 实际总传动比i实=i12i34=3.762×4=15.048,i=0.0210.05,故传动比满足要求满足要求。7. 各轴
34、的转速(各轴的标号均已在图1.1中标出)n0=960r/min,n1=n0=960r/min,n2=n1/ i12=303.673r/min,n3= n2/ i34=63.829r/min,n4=n3=63.829r/min8. 各轴的功率=0.808pr=3 kw选用三相异步电动机y132s-6p=3 kwn=960r/mini=15.072i12=3.762i23=4n0=960r/minn1=960r/minn2=303.67r/minn3=63.829r/minn4=63.829r/min 3.计算内容计算结果p0=pr=3 kw, p1= p02=2.970kw, p2= p143=
35、2.965 kw, p3= p253=2.628 kw, p4=p323=2.550 kw 4. 各轴的转矩,由式:t=9.55pi/ni 可得:t0=29.844 n·m, t1=29.545 n·m, t2=86.955 n·m, t3=393.197 n·m, t4=381.527 n·m四,传动零件的设计计算1. 闭式直齿轮圆锥齿轮传动的设计计算a选材:小齿轮材料选用45号钢,调质处理,hb=217255,hp1=580 mpa,fmin1 =220 mpa大齿轮材料选用45号钢,正火处理,hb=162217,hp2=560 mpa,f
36、min2 =210 mpab. 由参考文献2(以下简称2)式(533),计算应力循环次数n:n1=60njl=60×960×1×8×11×250=1.267×10 n2=n1/i2 =1.267×10/3=2.522×10查图517得 zn1=1.0,zn2=1.12,由式(529)得 zx1=zx2=1.0,取shmin=1.0,zw=1.0,zlvr=0.92,h1=hp1zlvrzwzx1zn1/shmin=580×0.92=533.6 mpa,h2=hp2zn2zx2zwzlvr/shmin =5
37、60×1.12×0.92=577 mpah1> h2,计算取h= h2=533.6 mpac按齿面接触强度设计小齿轮大端模数(由于小齿轮更容易失效故按小齿轮设计): 取齿数 z1=21,则z2=z1 i12=3.762×32=79,取z2=79实际传动比u=z2/z1=79/21=3.762,且u=tan2=cot1,2=72.2965=7216 35,1=17.7035=1742 12,则小圆锥齿轮的当量齿数zm1=z1/cos1 =21/cos17.7035=23,zm2=z2/cos2=79/cos72.2965=259.79 p0= 3 kw p1=
38、 2.970 kwp2= 2.965 kw p3=2.628 kw p4=2.550 kwt0=29.844 n·m t1=29.545 n·m t2=86.955 n·m t3=393.197n·m t=381.527n·mhp1=580 mpa,fmin1=220 mpahp2=560 mpa,fmin2=210 mpah=533.6mpa圆锥齿轮参数z1=21z2=791=1742 122 =7216 35 4.计算内容计算结果代做模具、机械等专业的课程设计、毕业设计,并且拥有大量现成的机械、模具毕业设计,都是答辩后全套的设计,有图纸、说
39、明书和英文翻译,有需要的可联系我们。qq:943048723手机套设计仅供下载的同学参考,谢谢!由2图5-14,5-15得 yfa=2.8,ysa=1.55,yfa2=2.23,ysa2=1.81zh=2/cos×sin=2/cos20×sin20=2.5 由2表11-5有 ze=189.8,取kt·z=1.1, 由2 取k=1.4又 t1=28.381 n·m ,u= 3.762,r=0.3 由2式5-56计算小齿轮大端模数: m4kt1yfaysa/rzf(1-0.5r)2 u2 +1 将各值代得 m1.498由2表5-9取
40、 m=3 d齿轮参数计算:大端分度圆直径 d1=mz1=3×21=63,d2=mz2=3×79=237齿顶圆直径 da1=d1+2mcos1=63+6cos17.7035=68.715,da2=d2+2mcos2=237+6cos72.2965=238.827齿根圆直径df1=d1-2.4mcos1=63-7.2cos17.7035=56.142df2=d2-2.4mcos2=237-7.2×cos72.2965=231.808齿轮锥距 r=d1+ d2/2=122.615,大端圆周速度 v=d1n1/60000=3.14×63×960/600
41、00=3.165m/s,齿宽b=rr =0.3×122.615=36.78由2表5-6,选齿轮精度为8级由1表4.10-2得1=(0.10.2)r=(0.10.2)305.500=30.0560.1取1=10,2=14,c=10轮宽 l1=(0.10.2)d1=(0.10.2)93=12.4l2=(0.10.2)d2=(0.10.2)×291=39e验算齿面接触疲劳强度: 按2式5-53h= zhze2kt1u+1/bd u(1-0.5r)2 ,代入各值得圆锥齿轮参数m=3 d1=63d2=237da1= 68.715da2=238.827df1=56.142df2=231
42、.808r=122.615v=3.165m/sb= 36.781=102=14c=10l1=12.4l2=39 5.计算内容计算结果h=470.899h =533.6 mpa 小齿轮满足接触疲劳强度,且大齿轮比小齿轮接触强度高,故齿轮满足接触强度条件f齿轮弯曲疲劳强度校核:按2式5-55由2图5-19得yn1=yn2=1.0,由2式 5-32及m=25,得yx1=yx2=1.0取yst=2.0,sfmin=1.4,由2式5-31计算许用弯曲应力:f1= fmin1yfa1ysa1yst/ sfmin =220×2.0/1.4=314.29 mpaf2= fmin2yfa2ysa2ys
43、t/ sfmin =210×2.0/1.4=300 mpaf1f2, f=f2=300 mpa由2式5-24计算齿跟弯曲应力:f1=2kt1yfa1ysa1/b1md1(1-0.5r)=2×1.4×80070×2.8×1.55/0.85×2×28.935×62=181.59 300 mpaf2=f1 yfa2ysa2/(yfa1ysa1)=181.59×1.81×2.23/(2.8×1.55)=178.28300mpa两齿轮满足齿跟弯曲疲劳强度2. 闭式直齿轮圆柱齿轮传动的设计计算a选
44、材:小齿轮材料选用45号钢,调质处理,hb=217255,hp1=580 mpa,fmin1=220 mpa大齿轮材料选用45号钢,正火处理,hb=162217,hp2=560 mpa,fmin2=210 mpab. 由参考文献2(以下简称2)式(533),计算应力循环次数n:n1=60njl=60×960×1×8×11×250=1.267×10, n2=n1/i23=1.267×10/3=2.522×10查图517得 zn1=1.05,zn2=1.16,由式(529)得 zx1=zx2=1.0,取shmin=1.
45、0,zw=1.0,zlvr=0.92,h1=hp1zlvrzwzx1zn1/shmin=580×1.05×0.92=560.28 mpah=533.6 mpaf=300 mpahp1=580 mpafmin1=220 mpahp2=560 mpafmin2=210 mpa 6.计算内容计算结果h2=hp2zn2zx2zwzlvr/shmin=560×1.16×0.92=597.63 mpah1> h2,计算取h= h2=560.28 mpac. 按齿面接触强度计算中心距(由于小齿轮更容易失效故按小齿轮设计):u=i34=4,a=0.4,zh=2/c
46、os·sin=2/cos200 ·sin200 =2.5且由2表11-5有 ze=189.8,取kt·z=1.1 2式5-18计算中心距: a(1+u)kt1 (ze zhz/h)2 /(2ua)=5×1.1×86955×2.5×189.8/(2×4×0.4×560.28)=147.61 由1表4.2-10 圆整 取 a=160d齿轮参数设计:m=(0.0070.02)a=180(0.0070.02)=1.263.6查2表5-7取 m=2齿数z1=2a/m(1+u)=2×160/2(1
47、+4)=32z2=uz1=4×32=128 取z2=128则实际传动比 i=149/31=4分度圆直径 d1=mz1=2×32=64 ,d2=mz2=2×128=256齿顶圆直径 da1= d1+2m=68,da2=d2+2m=260齿基圆直径 db1= d1cos=64×cos20o =60.14db2= d2cos=256×cos20o =240.56齿根圆直径 df1= d1-2.5m=64-2.5×2=59df2= d2-2.5m=256-2.5×2=251圆周速度 v=d1n2/60×103 =3.14&
48、#215;256×63.829/60×103 =1.113 m/s,中心距 a=(d1+d2)/2=160齿宽 b=aa =0.4×160=64由2表5-6,选齿轮精度为8级h=560.28 mpa圆柱齿轮参数m=2z1=32z2=128d1=64 d2=256da1=8da2=260db1 =60.14db2 =240.56df1=59df2= 251v=1.113 m/sa=160b=64 7.计算内容计算结果e. 验算齿面接触疲劳强度按电机驱动,载荷平稳,由2表5-3,取ka=1.0;由2图5-4(d),按8级精度和vz/100=dn/60000/100=0
49、.30144,得kv=1.03;由2表5-3得ka=1.2;由2图5-7和b/d1=72/60=1.2,得kb=1.13; k=kvkakakb=1.03×1.2×1.0×1.13=1.397 又a1=arccosdb1/da1=arccos(60.14/68)=28.0268=281 36;a2 = arccosdb2/da2=arccos(2240.56/260)=22.0061=220 17重合度 a=z(tana1-tan)+ z(tana1-tan)/2=32(tan28.0268-tan20)+128(tan22.0061-tan20)=1.773即z
50、=(4-a)/3=0.862,且 ze=189.8,zh=2.5 h =zhzez2kt1(u+1)/bd2 1页:11u=2.5×189.8×0.8622×1.397×83510×5.8065/(72×622 ×5.024)=240.63h =560.28 mpa 小齿轮满足接触疲劳强度,且大齿轮比小齿轮接触强度高,故齿轮满足接触强度条件f齿轮弯曲疲劳强度校核:按z1=32,z2=128,由2图5-14得yfa1=2.56,yfa2=2.18;由2图5-15得ysa1=1.65,ysa2=1.84由2式5-23计算 y=0
51、.25+0.75/a=02.5+0.75/1.773=0.673由2图5-19得yn1=yn2=1.0,由2式 5-32切m=25,得yx1=yx2=1.0取yst=2.0,sfmin=1.4,由2式5-31计算许用弯曲应力:f1= fmin1yfa1ysa1yst/ sfmin =220×2.0/1.4=314.29 mpaf2= fmin2yfa2ysa2yst/sfmin=210×2.0/1.4=300 mpaf1= 314.29 mpaf2= 300 mpa 8.计算内容计算结果f1f2, f=f2=300 mpa由2式5-24计算齿跟弯曲应力:f1=2kt1yfa
52、1ysa1y/bd1m=2×1.397×83510×2.56×1.65×0.673/(2×64×64)=71.233 300 mpaf2=f1yfa2ysa2/yfa1ysa1=71.233×1.84×2.18/(2.56×1.65)=67.644300 mpa两齿轮满足齿跟弯曲疲劳强度五, 轴的设计计算9. 减速器高速轴i的设计a. 选择材料:由于传递中小功率,转速不太高,故选用45优质碳素结构钢,调质处理,按 2表8-3查得 b=637 mpa, b-1=59 mpab. 由扭矩初算轴伸直径
53、:按参考文献2 有 dap/n n0=960r/min,p1=2.97 kw,且a=0.110.16d11623 取d1=20c. 考虑i轴与电机伸轴用联轴器联接。并考虑用柱销联轴器,因为电机的轴伸直径为dd=38,查1表4.7-1选取联轴器规格hl3(y38×82,y30×60),根据轴上零件布置,装拆和定位需要该轴各段尺寸如图1.2a所示d. 该轴受力计算简图如图1.2b , 齿轮1受力:(1)圆周力ft1=2t1/dm1=2×29.545/(64×10-3 )=915.52 n,(2)径向力fr1= ft1·tan·cos1=9
54、15.52×tan200 ·cos17.70350 =317.44 n, (3)轴向力fa1= ft1·tan·sin1=915.52×tan200 ·sin17.70350 =101.33 n,e. 求垂直面内的支撑反力:mb=0,rcy= ft1(l2+l3)/l2=915.52(74+55)/74=1595.97.97 n y=0,rby= ft1-rcy=915.52-1595.97=-680.45 n,f=300 mpab=637 mpa, b-1=59 mpad1=20选用柱销联轴器hl3(y38×82,y30&
55、#215;60)ft1=915.52 nfr1=317.44 nfa1=101.33 nrcy= 1595.97nrby=-680.45 n 9. 计算内容计算结果垂直面内d点弯矩mdy=0,m= rcy l3+ rby(l2+l3)=1595.97×55-680.45×129= 3662.14 n·=3.662 n·mf. 水平面内的支撑反力:mb=0,rcz=fr1(l3+l2)-fa1dm1/2/l2 =317.44(74+55)-680.45×64/74=419.07 n,z=0,rbz= fr1- rcz =317.44-419.07
56、=-101.63n,水平面内d点弯矩mdz=0,m= rczl3+ rbz(l3+l2)= 419.07×55-101.63×129=-7.095n·mg. 合成弯矩:md=m+ m= 0 n·m, m=m+ m=7.98 n·mh. 作轴的扭矩图如图1.2c所示,计算扭矩:t=t1 =29.545n·mi. 校核高速轴i:根据参考文献3第三强度理论进行校核: 由图1.2可知,d点弯矩最大,故先验算d处的强度, md m ,取m= m=7.98 n·m, 又抗弯截面系数:w=d3 min /32=3.14×203
57、/32=1.045×10m =m+t/ w=7.98+29.545/1.045×10=39.132b-1= 59 mpa故该轴满足强度要求。2. 减速器低速轴ii的设计a. 选择材料:因为直齿圆柱齿轮的小轮直径较小(齿跟圆直径db1=62)需制成齿轮轴结构,故与齿轮的材料和热处理应该一致,即为45优质碳素结构钢,调质处理按 2表8-3查得 b=637 mpa, b-1=59 mpab. 该轴结构如图1.3a,受力计算简图如图1.3b齿轮2受力(与齿轮1大小相等方向相反):ft2=915.52n, fr2=317.44 n, fa2= 101.33 n,齿轮3受力:mdy=0
58、m= 3.662 n·mrcz=419.07 nrbz= -101.63nmdz=0m= -7.095n·mmd=0 n·m, m=7.98 n·mt= 29.545n·mm= 7.98 n·mb=637 mpa, b-1=59 mpaft2=915.52nfr2=317.44 nfa2= 101.33 n 10.计算内容计算结果(1)圆周力ft3=2t2/dm3=2×86.955/(64×10-3 )=2693.87n (2)径向力fr3= ft2·tan=2693.87×tan200 =98
59、0.49 n c. 求垂直面内的支撑反力:mb=0,ray= ft2(l2+l3)+ ft3l3/(l1+l2+l3)=915.52(70+63)+2693.87×63/183=1919.26 n y=0,rby=ft2+ft3-rcy=915.52+2693.87-1919.26=1690.13 n垂直面内c点弯矩:mcy = ray l1=1919.26×21.5=41.26 n·m,m= rby(l2+l3)- ft3l2 =1690.13×133-2693.87×70= 41.26 n·m,d点弯矩:mdy= rby l3=1
60、690.13×63= 92.96n·m,m= ray(l1+l2)- ft2 l2=1919.26×120-915.52×70=92.96 n·md. 水平面内的支撑反力:mb=0,raz=fr2(l3+l2)+fr3l3-fa2dm2/2/(l1+l2+l3) =317.44×133980.49×63-101.33×238.827/2/128=750.70 nz=0,rbz= fr2+ fr3- raz =317.44+980.49-750.70=547.23n,水平面内c点弯矩:mcz= razl1=750.7
61、0×50=23.65 n·m,m1 cz= rbz (l3+l2)- fr3l2=547.23×133 - 980.49×70=-10.55n·m,d 点弯矩:mdz = rbz l3=547.23×63=30.10 n·m,m1 dz= raz(l1+l2)-fa2dm2/2- fr2 l2=750.70×120-101.33×164.9/2-317.44×70= 29.92n·m e. 合成弯矩:mc=m+ m= 47.56n·mm=m+ m=42.59 n·m
62、ft3=2693.87n f r3=980.49 nray=1919.26 nrby=1690.13 nmcy=41.26 n·mm =41.26n·mmdy= 92.96 n·mm= 92.96 n·mraz=750.70 nrbz=547.23nmcz=23.65 n·mm1 cz=-10.55n·mmdz=30.10 n·mm1 dz=29.92n·mmc=47.56n·mm=42.59 n·m 11. 计算内容计算结果md=m+ m=97.71 n·m,m=m+ m= 97.6
63、6n·mf. 作轴的扭矩图如图1.3c所,计算扭矩:t=t2=86.955n·mg. 校核低速轴ii强度,由参考文献3第三强度理论进行校核:1. 由图1.3可知,d点弯矩最大,故先验算d处的强度, md m ,取m= m=97.71 n·m,抗弯截面系数:w=d3 min /32=3.14×303 /32=2.65×10-6 m3 =m2 +t2 / w=97.712 +86.9552 /2.65×10-3 =44.27b-1=59 mpa(2).由于c点轴径较小故也应进行校核: mc m ,取m= m=47.56 n·m,
64、抗扭截面系数:w=d3 min /32=3.14×303 /32=2.65×10-6 m3 =m2 +t2 / w=47.562 +86.9552 /2.65×10-6 =35.14b-1= 59 mpa故该轴满足强度要求3. 减速器低速轴iii的设计a. 选择材料:由于传递中小功率,转速不太高,故选用45优质碳素结构钢,调质处理,按2表8-3查得 b=637 mpa, b-1=59 mpab. 该轴受力计算简图如图1.2b 齿轮4受力(与齿轮1大小相等方向相反):圆周力ft4=2693.87n,径向力fr4=980.49 n c. 求垂直面内的支撑反力:mc=0
65、,rby= ft4l1/( l1+l2)=2693.87×71/(125+71)=1157.52 n y=0,rcy= ft4- rby =2693.87-1157.52 =1536.35 n,垂直面内d点弯矩mdy= rcyl1=1536.35×55=84.50 n·m ,m= rby l2=1157.52×125=84.50 n·md. 水平面内的支撑反力:md=97.71 n·mm=97.66n·mt =86.955n·mm= 47.56 n·mb=637 mpab-1=59 mpaft4=2693
66、.87nfr4=980.49 nrby=1157.52 n rcy=1536.35 nmdy=84.50 n·mm=84.50 n·m 12.计算内容计算结果mc=0,rbz=fr4 l1/( l1+l2)=980.49×70/196=421.31nz=0,rcz= fr4- rbz =980.49-421.31=559.18n,水平面内d点弯矩mdz= rcz l1=559.18×71=30.75 n·m,m= rbz l2=421.31×125=30.76 n·me. 合成弯矩:md=m+ m= 90.20 n·
67、;m, m=m+ m=89.92 n·mf. 作轴的扭矩图如图1.2c所,计算扭矩:t=t3=393.197n·mg. 校核低速轴iii:根据参考文献3第三强度理论校核: 由图1.2可知,d点弯矩最大,故先验算d处的强度, md m ,取m= md =90.20 n·m, 又抗弯截面系数:w=d3 min/32=3.14×423 /32=7.27×10-6 m3 =m2 +t2 / w=90.20 2 +393.1972 /7.27×10-6 =55.73b-1= 59 mpa故该轴满足强度要求。六,滚动轴承的选择与寿命计算1. 减速
68、器高速i轴滚动轴承的选择与寿命计算a. 高速轴的轴承既承受一定径向载荷,同时还承受轴向外载荷,选用圆锥滚子轴承,初取d=40,由1表4.6-3选用型号为30208,其主要参数为:d=40,d=80,cr=59800 n,=0.37,y=1.6,y0=0.9,cr0=42800查2表9-6当a/r时,x=1,y=0;当a/r页:18时,x=0.4,y=1.6b. 计算轴承d的受力(图1.5), (1)支反力rb= r+ r=36.252 +269.272 =271.70 n,rc= r+ r=1184.792 +353.692 =1236.46 n(2)附加轴向力(对滚子轴承 s=fr/2y)
69、rbz=421.31nrcz=559.18nmdz=30.75 n·mm=30.76 n·mmd=90.20 n·mm=89.92 n·mt= 393.197n·mm= 90.20 n·m选用圆锥滚子轴承30208(gb/t297-94)rb=271.70 nrc=1236.46 n 13.计算内容计算结果sb=rb/2y=271.70/3=90.57 n,sc=rc /2y=1236.46/3=412.15 nc. 轴向外载荷 fa=fa1=101.33 nd. 各轴承的实际轴向力 ab=max(sb,fa -sc)= fa -sc
70、 =310.82 n,ac=(sc,fa +sb)= sc =412.15 ne. 计算轴承当量动载 由于受较小冲击查2表9-7 fd=1.2,又轴i受较小力矩,取fm =1.5 ab/rb=310.82/271.70=1.144=0.37 ,取x=0.4,y=1.6, pb= fdfm(x rb +yab)=1.8×(0.4×271.7+1.6×310.82)=1090.79 nac/ rc =412.15/1236.46=0.33=0.37 ,取x=1,y=0,pc= fdfm(x rc +yac)=1.2×1.5×1×1236.
71、46= 2225.63nf. 计算轴承寿命 又pb pc,故按pc计算,查2表9-4 得ft=1.0 l10h=106 (ftc/p)/60n1=106 (59800/2225.63)10/3 /(60×960)=0.12×106 h,按每年250个工作日,每日一班制工作,即l1=60.26l=11年 故该轴承满足寿命要求。2. 减速器低速ii轴滚动轴承的选择与寿命计算a. 高速轴的轴承既承受一定径向载荷,同时还承受轴向外载荷,选用圆锥滚子轴承,初取d=35,由1表4.6-3选用型号为30207,其主要参数为:d=35,d=72,cr=51500 n,=0.37,y=1.6
72、,y0=0.9,cr0=37200 查2表9-6当a/r时,x=1,y=0;当a/r页:20时,x=0.4,y=1.6b. 计算轴承d的受力(图1.6) 1. 支反力rb=r+r=1919.262 +547.232 =1995.75 nsb=90.57 nsc=412.15 nfa=101.33 nab=310.82 nac=412.15 npb=1090.79 npc=2225.63n选用圆锥滚子轴承30207(gb/t297-94)rb=1995.75 n 14.计算内容计算结果ra= r + r =750.702 +353.692 =922.23 n2. 附加轴向力(对滚子轴承 s=fr
73、/2y) sb=rb /2y=1995.75/3.2=623.67 n,sa=ra/2y=922.23/3.2=288.20 nc. 轴向外载荷 fa=fa2=101.33 nd. 各轴承的实际轴向力 ab=max(sb,fa +sa)= sb =623.67 n,aa=(sa,fa-sb)= fa-sb =522.34 ne. 计算轴承当量动载 由于受较小冲击查2表9-7 fd=1.2,又轴i受较小力矩,取fm =1.5 ab/rb=623.67/1995.75=0.312=0.37,取x=1,y=0 pb= fd fm(x rb +yab)=1.2×1.5×1995.75=3592.35 naa/ ra =522.34/922.23=0.566=0.37,取x=0.4,y=1.6 pa= fd fm(x ra +yaa)=1.8×(0.4×922.23+1.6×522.34)=2168.34nf. 计算轴承寿命 又pb pa,故按pb计算,查2表9-4 得ft=1.0 l10h=106 (ftc/p)/60n2=106 (51500/3592.35)10/3 /(60×303.673)=0.1833×106 h,按每年250个工作日,每日一班制工作,即l1=91.65l=11年 故该轴承满足寿命要求。3.
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