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Ging vin hng dn : ThS Nguyn Vn Thnh . B mn : Thit K My Trng i Hc Bch Khoa Tp.HCM DAMH Chi Tit My.
-1- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
Chi tit my l mn hc c bn cung cp nhng kin thc v kt cu my .
Em rt phn khi khi hc k ny em c giao bi tp ln Chi Tit My. y l
bc khi u quan trng em tm ti nghin cu cc kin thc chuyn ngnh
phc ph cho n tt nghip sau ny .
Em xin chn thnh cm n cc thy gio trong b mn C S Thit K My,
c bit l thy Nguyn Vn Thnh ch bo em tn tnh gip em hon thnh tt
bi tp ln ny .
Tp.HCM thng 10 nm 2012 .
Sinh vin
Nguyn Thnh Cng .
Ging vin hng dn : ThS Nguyn Vn Thnh . B mn : Thit K My Trng i Hc Bch Khoa Tp.HCM DAMH Chi Tit My.
-2- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
PH LC
LI GII THIU .
I. Xc nh s vng quay trc bng ti
1. Tnh cng sut trc 2 trc.
2. Tnh s vng quay 2 trc
II. Tnh t s truyn chung
1. Tnh Uc = Ud . Ubr .Ux
III. Phn phi t s truyn
1. Chn Ud, Ux, tnh Ubr
IV. Thit k cc b truyn ngoi ( B Truyn ai dt )
1. Chn dng ai
2. Xc nh khong cch trc a
3. Kim tra s vng chy I
4. Xc nh lc tc dng ln trc v lc csng9 ai ban u
V. Thit k cc b truyn ngoi ( B Truyn Xch )
1.Chn loi xch
2.Xc nh thng s ca b truyn
3.Kim nghim xch v bn
4.Xc nh cc thng s a xch v lc tc dng ln a xch
VI. . Tnh ton thit k bnh rng trong hp gim tc .
1. Chn vt liu .
2. Xc nh ng sut cho php .
4. Tnh ton cp chm (Bnh rng tr rng thng ) .
Ging vin hng dn : ThS Nguyn Vn Thnh . B mn : Thit K My Trng i Hc Bch Khoa Tp.HCM DAMH Chi Tit My.
-3- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
VII . Tnh ton thit k kt cu trc trong hp gim tc .
1. Chn vt liu
2. Trnh t thit k
a, Xc nh s t lc ,
b, Tnh s b ng knh trc
c, Xc nh phn lc ti cc gi
d, Tnh chnh xc ng knh cc on trc
3. Kim nghim trc v bn mi .
4. Kim nghim bn ca then .
VIII . Tnh ton v chn ln cho 2 trc .
1 . Chn ln
2 . Tnh ton chn c ln.
a , Trc 1
b, Trc 2
IX . Danh sch cc ti liu c tham kho
- C s thit k my (Ts Nguyn Hu Lc )
- Bi tp chi tit my (Ts Nguyn Hu Lc )
- Dung sai v lp ghp ( Ninh c Tn )
- Bi tp v k thut c kh tp 2 (Trn Hu Qu - Nguyn Vn Tun)
Ging vin hng dn : ThS Nguyn Vn Thnh . B mn : Thit K My Trng i Hc Bch Khoa Tp.HCM DAMH Chi Tit My.
-4- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
BN THUYT MINH BI TP LN CHI TIT MY
TNH TON THIT K H DN NG BNG TI
S: 1
H thng truyn ng xch ti gm :
1 H thng truyn ng bng ti . 2 Hp gim tc. 3 bnh rng tr : 4 - ln ;
5 Xch ti ; 6 ; B phn cng tc .
Ging vin hng dn : ThS Nguyn Vn Thnh . B mn : Thit K My Trng i Hc Bch Khoa Tp.HCM DAMH Chi Tit My.
-5- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
S liu thit k :
Ti tnh ,lm vic 2 ca ( 1 nm lm vic 300 ngy , 1 ngy lm vic 8 gi )
Cng sut ca ng c l cng sut trc 1 ( 3 s cui ca MSSV chia 20 )
P1 = 1,1 kw
Vn tc trc 1 (S cui ca sinh vin 2 nn chn l 750 vg / ph )
Vn tc ca bng ti ( S cui ca sinh vin 2 nn chn l 1,4 m/s )
ng knh tang dn ca bng ti D = 300 (mm Do cui ca sinh vin l 2 )
Thi gian phc v L = 5000 gi
Sai s vng quay trc my cng tc so vi yu cu 5 % .
Ch ti :
Phn 1 Xc nh s vng bng ti.
1 . Tnh s vng quay ca bng ti .
= 6000.
. =
6000.1,4
.300 = 89,12 vp /ph .
Phn 2 Tnh t s truyn chung
Ta c : Uc = Ux. Ubr . Ud =
=
750
89,12 = 8,41
Ta chn Ux = 2 Ud = 2 theo bng 3,2 / 88
Ubr =
=
8,41
2.2 = 2,1
Phn 3 Phn phi t s truyn 1. Tnh s vng quay trn cc trc
S vng quay trc 1 ; 1 = 750 vg /ph
S vng trc II : 2 = 1
=
750
2,1 = 357 vg /ph
2 . Tnh cng sut trc 2.
Theo bng 3,3 ta chn hiu sut ca cc b phn trong hp gim tc nh sau :
= 0,95 ; = 0,93; = 0,97; = 0,99
= . . . = 0,95.0,93.0,97.0,992 = 0,83 kw
Ta c : Pdc =
Pct = . Pdc = 0,83 . 1,1 = 0,913 kw
Ging vin hng dn : ThS Nguyn Vn Thnh . B mn : Thit K My Trng i Hc Bch Khoa Tp.HCM DAMH Chi Tit My.
-6- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
P2 =
. =
0,913
0,95.0,97 = 0,99 kw
3 . Tnh momen xon trn cc trc
T1= 9,55.1061
1= 9,55106
1,1
750= 14006,6 .
T2 =9,551062
2= 9,55106
0,99
357 = 26483,2 N.mm
Bng c tnh .
Thng s Trc 1 Trc 2
Cng sut kw 1,1 0,99
T s truyn 2 2,1
S vng quay (vg/ph)
750 357
Moment xon (N,mm)
14006,6 26483,2
Phn 4 Thit k b truyn ai dt
Thng s k thut thit k b truyn ai dt
Cng sut b truyn P1 = 1,1 kw
S vng quay bnh dn n1 = 750 vg /ph
T s truyn : Ud = 2
Moment xon T1= 14006,6 N.mm .
1 .Theo bi th dng ai l ai dt v vt liu ai l vi cao su .
2 . nh dng knh bnh ai nh theo theo cng thc Savrin:
d1 = ( 11001300) . 1
1
3 = 1100.
1,1
750
3 = 124,9 mm ,
Theo tiu chun chn d1 = 125 mm .
Ging vin hng dn : ThS Nguyn Vn Thnh . B mn : Thit K My Trng i Hc Bch Khoa Tp.HCM DAMH Chi Tit My.
-7- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
3. Tnh vn tc V1: V1 = 11.
6.104 =
.125.750
6.104 = 4,9 m/s .
4. Chn h s trt tng i = 0,01 0,02 .
ng knh d2 = d1. ( 1 ) .Ud = 125.(1-0,01).2 = 247,5 mm .
Theo tiu chun chn d2 = 250 mm.
T s b truyn ai :
U = 2
1.(1 ) =
250
125.(10,01) = 2,02
5. Chn khong cch trc a theo diu kin .
15.m a 2 .( d2 + d1 ) = 2.(250 + 125) = 750 mm.
6. Tnh chiu di L dy ai .
L = 2.a + .( 1+ 2)
2 +
(2 1)2
4. = 2.750 +
.( 125+250)
2 +
(250125)2
4.750 = 2094,2 mm.
ni ai ta tng thm chiu di ai L ln 1 khong 100 400 mm . Kh
L = 2094,2 + 400 = 2494mm . Theo tiu chun chn L = 2500 mm .
7. Kim tra li s vng chy I ca dy ai trong 1 giy ..
i =
=
4,9 .1000
2094 = 2,3 1 [ I ] = 51.
8. Tnh gc m ai 1 theo cng thc:
1 = (21)
=
(250125)
750 = 2,97 rad
Hoc l : 1 = 180 57.(21)
= 180 57.
(250125)
750= 170,50.
9 . Chn chiu dy ai = 4 mm . Tha iu kin 1
=
125
4 = 31,25 30
10. Tnh cc h s Ci.
Cv : H s nh hng n vn tc :
Cv = 1 0,04.( 0,01V2 -1 ) = 1- 0,04.( 0,01.4,92 1 ) = 1,0379 .
- H s xt n nh hng ca gc m ai bng cng thc :
= 1 0,003.(180 - 1 ) = 1 0,003.(180 170,5) = 0,971
C0 : h s nh hng n v tr b truyn v phng php cng ai, ph thuc vo
gc nghing gia ng ni 2 tm bnh ai v 1 phng nm ngang.
Gc nghing 0 60 60 80 80 90
C0 1 0,9 0,8
Chn C0 = 1
Ging vin hng dn : ThS Nguyn Vn Thnh . B mn : Thit K My Trng i Hc Bch Khoa Tp.HCM DAMH Chi Tit My.
-8- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
Cr : h s ch alm2 vic tnh n nh hng ca thay i theo chu k ti trng
n tui th ai .
Ti trng Tnh Dao ng nh Dao ng mnh
Va p
Cr 1 0,85 0,9 0,8 0,8 0,7 0,7 0,6
Chn Cr = 0,9 .
ng c ch cho php [] i vi b truyn ai dt
=
[] = 2,17 Mpa ( bng 4,7 )
= 1000.1
1 =
1000. 1,1
4,9 = 224,48 N
A = b . = 4 .30 = 120 = 224,48
120 = 1,869 Mpa .
Chn b = 30 bng 4.2 / 125 ,ta chn
= 30 = 4 vi Dmin = 125 mm.
Vy [] = []0. C0. Cr. . Cv = 2,17.0,9586.1.1.0,9 = 1,872 Mpa
Vi []0 = 2,17 khi 1
= 30
Xc nh chiu rng ai theo cng thc :
b 1000.1
..[] =
1000 .1,1
4.4,9.1,872 = 29,97 mm , Chn b = 32 mm theo bng 4,5 / 129.
ai B = 40 mm
12. Lc cng ban u theo iu kin .
F0 = [0] . . = 1,8.32.4 = 230 N , vi [0] ng sut ban u 0 = 1,8 Mpa
Lc tc dng ln trc :
Fr 3 . F0.Sin1
2 = 3.230.Sin
170,5
2 = 687,6 N
13. Lc vng c ch :
Ft = 1000.1
1 =
1000. 1,1
4,9 = 224,4 N .
14. T iu kin khng xy ra trt trn .
F0 .(
.+1)
2.(1) => h s trt ti thiu gia bnh ai v ai :
F0.2(. 1) = . (. + 1) 230.2 .(.2,97 1) = 224,4.( .2,97 +
1 ) f = 0,36 .
gim fmin ta tng F0 bng cch tng chiu rng ai b, gi s b = 40 kh
F0 = 288 N v fmin = 0,28 .
Ging vin hng dn : ThS Nguyn Vn Thnh . B mn : Thit K My Trng i Hc Bch Khoa Tp.HCM DAMH Chi Tit My.
-9- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
15. ng sut ln nht trong dy ai:
= 1 . . 1 = 0 + 0,5. + + 1
= 0
. +
2.4.40 + 1200 . 21.10
6 +
1 . E
= 230
4.40 +
224,4
2.4.40 +1200.4,92.10-6 +
4
125 .100 = 5,36 MPa.
16 .Tui th ai xc nh theo cng thc :
Lh = (
)
.107
2.3600. =
(6
5,36)
5.107
2.3600.1,8 = 1356,2 gi .
m : s m ca ng cong mi : m = 5 ( i vi ai dt )
Vi i= 1,8 ; chn m = 5 Chn = 6 MPa ( theo bng bn di , vi cao su
c lp m .
Vi Loi ai Vi cao su c lp m
Vi cao su khng c lp m
thanh Si bng
, MPa 0 6 7 9 4 5
A. Thng s k thut thit k bng ti bnh rng tr rng
thng .
Ti trng thay i theo bc :
Thi gian lm vic L = 5000 gi
Lm vic 2 ca/ngy
1 nm lm vic 300 ngy
Nu b truyn kn ( hp gim tc ) c bi trn tt th dng h
hng ch yu l trc r b mt rng , tnh ton thit k theo ng
sut tip xc .
1. Moment xon trn trc ca bnh dn ,
T1 = 26483,2 .
T s truyn : Ubr = 2,1
Ging vin hng dn : ThS Nguyn Vn Thnh . B mn : Thit K My Trng i Hc Bch Khoa Tp.HCM DAMH Chi Tit My.
-10- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
S vng quay n1 =357 vg/ph
2. Chn vt liu cho bnh dn v bnh b dn : Chn thp 45Cr ,
c ti ci thit . Theo bng 6.13 C s thit k my ca Ts
Nguyn Hu Lc
Chn rn trung bnh : HB1250
i vi bnh b dn chn rn : HB2 = 228 vt liu c kh
nng chy r tt
3. S chu k lm vic theo c s
1 = 30H12,4 = 302502,4= 1,71107 chu k
NHO2 = 30HB2 2,4=30.228 2,4 =1,37107 chu k
4. Theo bng 6.13 gii hn mi tip xc un cc bnh rng xc1 nh
nh sau :
= 2 + 70
=>1 = 2.250 + 70 = 570
2 = 2.228 + 70 = 526 Mpa
= 1,8=> 1 = 1,8.250=450 MPa
V 2 =1,8.228 = 410,4 Mpa
5. Hiu sut tip xc
[1] =
=
570.0,9
1,1 = 466Mpa
[2] =526.0,9
1,1= 430,4
. ng sut un cho php [] =.
Chn SF = 1,75
[1] =450
1,75= 257[2] =
410,4
1,75= 234,5
8. 6,15 0,3
0,5 chn =0,4 theo tiu chun .
Ging vin hng dn : ThS Nguyn Vn Thnh . B mn : Thit K My Trng i Hc Bch Khoa Tp.HCM DAMH Chi Tit My.
-11- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
=.(+1)
2= 0,4.
2,1+1
2= 0,62
Theo bng 6,4 sch c s thit k my Ts Nguyn Hu Lc trang
208 ta chn = 1,02 , = 1,04
9,Khong cch trc truyn bnh rng
= ( + 1)1
()2.
3 =
50.(2,1+1).26483,2 .1,02
0,4.430,42.2,1
3= 86,46 mm
Theo tiu chun ta chn = 100 dy 1 l dy u tin
10. Mun bnh rng m = ( 0,01 0,02 ) . = 100.0,02 = 2
Theo tiu chun chn m = 2 .
Tng s rng : Z1 + Z2 = 2 .
=
2.100
2 = 100 rng .
S rng bnh dn Z1 = 1+ 2
+1 =
100
3,1 = 32,2 rng .
Chn Z1 = 32 rng Z2 = 68 rng .
12 . T s truyn sau khi chn s rng : Ubr = 2
1 =
68
32 = 2,12
13. Cc thng s b truyn bnh rng :
d1 = Z1 .m = 32 .2 = 64 mm ;
d2 = Z2 .m = 68 . 2 = 136 mm .
ng knh vng nh :
da1 = d1 + 2.m = 64 + 2.2 = 68 mm
da2 = d2 + 2.m = 136 + 2.2 = 140 mm
Khong cch trc : = .1.( 1+ )
2 =
2.32.( 1+2,1 )
2 = 99,2 100 mm
Dy
1
40 50 63 80 100 125 160 200 250 315 400
Dy
2
140 180 225 280 355 450
Ging vin hng dn : ThS Nguyn Vn Thnh . B mn : Thit K My Trng i Hc Bch Khoa Tp.HCM DAMH Chi Tit My.
-12- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
Chiu rng vng bnh rng :
- Bnh b dn : b2 = . = 0,4.100 = 40 mm
- Bnh dn : b1 = =b2 + 5 = 40 + 5 = 45 mm
14. Vn tc vng bnh rng :
v = . 2.2
60000 =
.136 .357
60000 = 2,54 m/s
15 .Theo bng 6,3 ta chn cp chnh xc 9 vi vgh = 3 m/s
16. H s ti ng theo bng 6,5 ta chn :
KHV = 1,05 ; KFV = 1,25
17. Tnh ton kim nghim gi tr ng sut tip xc :
= . .
1 .
2. 1. .. . ( +1)
.
= 275.1,76.0,96
64 .
2.26483,2.1,02.1,05 .(2,1+1 )
40 .2,1 = 332,17 MPa
= 332,17 MPa [] = 0...
= 526. 1.0,9.0,9.1,1.1,02
1,1 = 395,1 MPa
Do diu kin tip xc c tha .
18 H s dng rng YF :
i vi bnh dn : Y F1 = 3,47 + 13,2
1 = 3,47 +
13,2
32 = 3,88
i vi bnh b dn : Y F2 = 3,47 + 13,2
2 = 3,47 +
13,2
64 = 3,67
c tnh so snh bn cc bnh rng ( bn un ) :
- Bnh dn : [1]
1 =
257
3,88 = 66,2
- Bnh b dn : [2]
2 =
234,5
3,67 = 63,8
19 .ng sut un tnh ton :
2 = 2.2.1..
1 . . =
2.3,71.26483,2.1,04.1,25
64.40.2 = 49,8 MPa
2 = 49,8 MPa 234,5 MPa .
Do bn un c tha .
Phn 6 Thit k b truyn xch
Ging vin hng dn : ThS Nguyn Vn Thnh . B mn : Thit K My Trng i Hc Bch Khoa Tp.HCM DAMH Chi Tit My.
-13- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
Thng s thit k :
P1 = 0,99 kw
n1 = 357 vg /ph
Ux = 2,1
Lm vic 2 ca .
T2 = 26483,2 N.mm .
1 . Chn xch con ln 1 dy .
2. Chn s rng ca a xch dn theo cng thc :
Z1 = 29 -2.Ux = 29 -2.2,1 = 24,8 ; chn Z1 = 25 rng
3 .Tnh s rng a xch ln theo cng thc :
Z2 = Ux.Z1 = 2,1. 25 = 52,5 ; Z2 = 52 rng
4. Xc nh cc h s diu kin s dng xch K theo cng thc .
K = Kr . Ka . K0 . Kdc . Kb . Klv
Trong :
Kr h s ti trng ng : ti trng tc dng ln b truyn tng
i m th Kr = 1 .
K0 h s xt n nh hng ca cch b tr b truyn, khi ng
ni 2 tm a xch hp vi dng nm ngang 1 gc 600 th K0 = 1
Ka h s xt n nh hng ca khong cch trc a = ( 30 50 )
.Pc th Ka = 1.
Kdc h s xt n nh hng ca kh nng iu chnh lc cng
xch : trc iu chnh c Kdc = 1 .
Kb - h s xt n iu kin bi trn : bi trn nh git Kb = 1
Klv h s xt n ch lm vic ; lm vic ca bng 1,12 .
Kx h s xt n s dy xch X , xch 1 dy X = 1 Kx = 1
Vy K =1.1.1.1.1,12 = 1,12
Kn = 01
1 =
400
357 = 1,121
Kz = 01
1 =
25
25 = 1
5. Cng sut tnh ton Pt :
Ging vin hng dn : ThS Nguyn Vn Thnh . B mn : Thit K My Trng i Hc Bch Khoa Tp.HCM DAMH Chi Tit My.
-14- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
Pt = ...1
=
1,12.1,121.1.0,.99
1 =1,24 kw
Theo bng 5,4 ct N01 = 400 vg /ph , th ta chn bc xch
Pc = 12,7 mm .
6. Theo bng 5,2 s vng quay ti hn tng ng bc xch 1250 vg /ph
nn iu kin n < ntt c tha .
7. Xc nh vn tc trung bnh V ca xch theo cng thc .
V = .1.1
6.104 =
1..1
6.104 =
357.25.12,7
6.104 = 1,88 m /s .
Lc vng c ch :
Ft = 1000.1
=
1000.0,99
1,88 = 526,5 N
8. Tnh ton kim nghim bc xch Pc theo cng thc 5,26 vi [ P0 ]
trong bng 5,5 l 24 MPa .
Pc 600.1.
1.1[0]
3 = 600.
0,99.1,12
25.357.24.1
3 = 10,37 mm
m Pc = 12,7 mm nn iu kin c tha .
9. Chn khong cch trc s b a = ( 30 50 ) = 40 .12,7 = 508 mm
S mt xch theo cng thc :
X = 2.
+
1+2
2 + (
2 1
2.)
2.
= 2.508
12,7 +
25+52
2 + (
5225
2.)
2.
12,7
508 = 118,8
Chn X = 118 mt xch
Chiu di xch L = Pc . X = 12,7 . 118 = 1498,5 mm
a = 0,25.Pc .[ X - 1+22
+ ( 1+2
2)
2 8. (
1+2
2)
2 ]
= 0,25 . 12,7 .[118 25+52
2+ (118
25+52
2)
2 8. (
25+52
2)
2] =
= 479,5 mm
Ta chn a = 476 mm ( gim khong cch trc ( 0,002 0,004 ) )
Ging vin hng dn : ThS Nguyn Vn Thnh . B mn : Thit K My Trng i Hc Bch Khoa Tp.HCM DAMH Chi Tit My.
-15- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
10. Tnh s ln va p xch trong 1 giy :
i = 1+1
15. [ i ]
= 25.357
15.118 = 5,04 < 40
Kim tra xch theo h s an ton theo cng thc . :
[ S ] tra theo bng 5.7
S =
1++0 [ S ]
= 22,7.103
526,5+3,1+25,42 = 40,9 > 9,3
Ti trng ph hy Q = 22,7 KN ; qm = 0,9 kg
Lc tc dng ln nhnh cng :
F1 Ft = 526,5 N
Lc cng do lc ly tm gy nn xc nh theo cng thc :
Fv = qm . v2 = 0,9.1,882 = 3,1 N .
Lc cng ban u ca F0 xc nh theo cng thc 5,17 .
F0 = kf . a . qm . g = 6.0,48.0,9.9,8 = 25,42 N
Kf = 6 khi xch nm ngang ; a : chiu di ca on xch t do gn
bng khong cch trc. a 0,48 m ; g = 9,8 m/s ( gia tc trng
trng ) .
11. Tnh lc tc dng ln trc theo cng thc .;
Fr = Km .Ft = 1,15. 526,4 = 605,3 N
vi Km = 1,15 khi xch nm ngang .
12. ng knh a xch :
d1 1
=
12,7.25
3,14 = 101 mm
2 2
=
12,7.52
3,14 = 210 mm .
da1 = d1 + 0,7.Pc = 101 + 0,7 .12,7 = 109,8 mm
da2 = d2 + 0,7.Pc = 210 + 0,7.12,7 = 218,8 mm
Phn 7 Thit K 2 trc trong hp gim tc .
Ging vin hng dn : ThS Nguyn Vn Thnh . B mn : Thit K My Trng i Hc Bch Khoa Tp.HCM DAMH Chi Tit My.
-16- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
A .Tnh ton thit k trc th 2 trong hp gim tc .
Phn tch lc tc dng ln trc cc chi tit quay ca h thng truyn
ng trong hp gim tc .
Tnh ton thit k trc th 2 trong hp gim tc .
S liu thit k : P2 = 0,99 kw , T2 = 26483,3 N.mm ;
T1 = 14006,6 N.mm ; n2 = 357 vg/ph ; ng sut un cho php d1 = Z1 .m = 32 .2 = 64 mm ; d2 = Z2 .m = 68 . 2 = 136 mm .
ng sut xon cho php :
[] = 10 15 MPa ( vi trc u ra )
chn [] = 15 MPa
ng sut un cho php [] = 50 MPa ( Da vo bng 10,1 / 350 )
Vt liu thp C35 , = 304 MPa , 1 = 255 MPa , = 510 MPa ,
Lc tc dng ln b truyn xch :
Fx = Km .Ft = 1,15 . 526,5 = 605,5 N
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-17- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
Lc tc dng ln b truyn bnh rng :
Ft1 =Ft2 =2.2
2 =
2.26483,2
136 = 389,4 N
Fr1 = Fr2 = Ft1 .tg20 = 389,4 . tg20 = 141,75 N
Lc tc dng ln b truyn ai :
Fr = 2. F0. Sin1
2 = 2. 230.Sin
170,5
2 = 687,6 N
2. Chn vt liu trc thp C35 , Chn s b ng sut xon cho php l:
[ ] = 10 MPa
3. Xc nh ng knh s b trc theo cng thc .
d 2
0,2 .[ ]
3 =
26483,2
0,2.10
3 = 23,7 mm
Theo tiu chun ng knh ca ln nh sau : d =12, 15, 25, 25, 30 ,35, 40, .. ta
chn ng knh ti ngong trc d = 25 mm.
Ti v tr trc lp b truyn xch bn tri , cc ng knh cn li ta chn nh hnh
v bn di .
4 . Chn ng knh dc trc theo cng thc : l = l1 + 2x + w
trong l1 = ( 1 1,5 )d2 = 1,5 .136 = 204 mm
Theo bng 10,2 chn W = 30 ( khi 10.103 N.mm T 20.103 N.mm . )
Bng 10,2 Thng s xc nh khong cch dc trc .
Mmen truyn T.103, N.mm
e, mm u ,mm f, khng nh hn ( mm )
W, ( mm )
10 40 65 30 55 35 50 20 40
T 10 n 20 45 70 35 60 40 55 25 45
T 20 n 40 50 80 40 65 45 65 25 50
.
x = 10 khe h gia bnh rng v thnh trong hp gim tc .
l = l1 + 2x + w l = 204 + 2.10 + 30 = 254 mm .
Khong cch f ta chn trong bng 10,2 khng nh hn ( 45 65 ) ,
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-18- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
chn f = 50 mm .
5. V biu mmen un v xon . ( trc )
Trong mt phng thng ng y0z, phng trnh cn bng mmen ti A
+ = 141,7 . 127 - RBy. 254 + 605,5.( 254 + 50 )
RBy = 794,9 N
Phng trnh cn bng theo trc Y.
+ = - RAy 141,7 + 794,9 605,5
RAy = 47,7 N .
Trong mt phng nm ngang xoz , phng trnh cn bng mmen ti A
+ = 389,4 . 127 - RBx. 254 RBx = 194,7 N.
Ta c RBx = RAx = 194,7 N
V biu momen nh hnh v .
MYA = 47,7 . 127 = 6057,9 N.mm
MD = 605,5 . 50 = 30275 N.mm .
MXA = MXB = 194,7 . 127 = 5256,9 N.mm .
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-19- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
Biu mmen ca trc 2
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-20- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
6. Xc nh v tr c momen tng ng ln nht da theo cc biu
momen un v xon th momen tng ng ln nht ti in C, v D .
Mc = 2 + 2 + 0,7522
= 6057,92 + 5256,92 + 0,75. 26483,222
= 24301,6 N.mm
MD = 2 + 2 + 0,7522
=
= 302752 + 0,75. 26483,222
= 37981,5 N.mm.
7. Xc nh ng knh ti tit din nguy him ti C .
=
=
32.
.3 [] d =
32..
.[]
3.
C d = 32.24301,6
.50
3 = 17,04 mm.
Do trc c rnh then nn ta tng ng knh 5 10 % do ;
d = 17,04.10% + 17,04 = 18,74 . V chn ng knh ti ln
d1 = 25 mm nn ta chn ng knh thn trc l d2 = 30 mm
Vy chn d2 = 30 mm
Xc nh ng knh ti tit din nguy him ti D .
=
=
32.
.3 [] d =
32..
.[]
3.
D d = 32.37981,5
.50
3 = 19,97 mm.
Do trc c rnh then nn ta tng ng knh 5 10 % do ;
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-21- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
d = 19,97.5% + 19,97 = 20,6 . Vy chn d = 20 mm
Bn v phc tho ca trc 2 :
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-22- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
Trc c 2 then vi ng knh ca then ti bnh xch d = 20 mm ;
d = [ 18,24 ] nn ta chn nn ta chn cc thng s ca then nh sau .
Tra sch V k thut c kh , L Khnh in , trang 104 bng 5,2 ta c
cc thng s ca then bng.
Chiu rng : b = 6 mm
Chiu cao : h = 6 mm
Chiu su rnh then trn trc : t = 3,5 mm
Chiu su rnh then trn mayo : t1 = 2,6 mm
Moment xon W= 3
32
()2
2. =
.203
32
6.3,5(203,5 )2
2.20= 642,4 mm3
Do trc quay nn ng sut thay i theo chu k i xng
= =
=
37981,5
642= 59 Mpa = 0
ng sut xon : =
0=
26483,2
1427,8 = 18,5 Mpa
Vi W0 = .3
16
()2
2.=
.203
16
6.3,5(203,5)2
2.20 = 1427,8 Mpa
Khi ng sut xon thay i theo chu k xon
= =
2=
18,5
2= 9,2
Ti tit din D c s tp trung ng sut l rnh then . theo bng 10,8 ta
chn .= 1,75 vi = 510 MPa 600 MPa , .= 1,5 MPa .
Theo bng 10,3 vi ng knh d = ( 20 30 )
ta chn = 0,91 ; = 0,89
H s = 0,025 v = 0,0175 , tra theo hnh 2,9
Xc nh h s an ton ti D :
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-23- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
S =1
..
+ . =
2551,75.59
0,91+0
= 2,24
S = 1
.
+ . =
1281,5.9,2
0,89+ 0,0175 .9,2
= 8,1
H s an ton :
S = S. S
(S )2+( S)2=
2,24 .8,1
2,242+8,12 = 2,15 > [S] = 1,5, do iu
kin bn mi c tho .
i vi v tr bnh rng thng c d = 30 ; d = [ 30 - 38 ] nn ta
chn nn ta chn cc thng s ca then nh sau .
Tra sch BAI TP V k thut c kh, tp 2 Trn Hu Qu Nguyn
Vn Tun , trang 7 bng 8,1 ta c cc thng s ca then bng.
Chiu rng : b = 10 mm
Chiu cao : h = 8 mm
Chiu su rnh then trn trc : t = 5 mm
Chiu su rnh then trn mayo : t1 = 3,3 mm
Moment xon W= 3
32
()2
2. =
.303
32
10.5(305 )2
2.30= 2130 mm3
Do trc quay nn ng sut thay i theo chu k i xng
= =
=
24301,6
2130= 11,4 Mpa = 0
ng sut xon : =
0=
26483,2
4780 = 5,5 Mpa
Vi W0 = .3
16
()2
2.=
.303
16
10.5(305)2
2.30 = 4780 Mpa
Khi ng sut xon thay i theo chu k xon
= =
2=
5,5
2= 2,75
Ti tit din D c s tp trung ng sut l rnh then . theo bng 10,8 ta
chn .= 1,75 vi = 510 MPa 600 MPa , .= 1,5 MPa .
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-24- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
Theo bng 10,3 vi ng knh d = ( 30 - 40 )
ta chn = 0,88 ; = 0,81
H s = 0,025 v = 0,0175 , tra theo hnh 2,9
Xc nh h s an ton ti D :
S =1
..
+ . =
2551,75.11,4
0,88+0
= 11,2
S = 1
.
+ . =
1281,5.2,75
0,81+ 0,0175 .2,75
= 24 .8
H s an ton :
S = S. S
(S )2+( S)2=
24,8.11,2
24,82+11,22 = 10,3 > [S] = 1,5, do iu
kin bn mi c tho .
B . Thit K 1 trc trong hp gim tc .
S liu thit k : P1 = 1,1 kw ,
T1 = 14006,6 N.mm ; n2 = 750 vg/ph ; ng sut un cho php d1 = Z1 .m = 32 .2 = 64 mm ; d2 = Z2 .m = 68 . 2 = 136 mm .
ng sut xon cho php :
[] = 20 25 MPa ( vi trc u vo )
chn [] = 25 MPa
ng sut un cho php [] = 50 MPa ( Da vo bng 10,1 / 350 )
Vt liu thp C35 , = 304 MPa , 1 = 255 MPa , = 510 MPa ,
Phn tch lc trn trc 1
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-25- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
Lc tc dng ln b truyn ai :
Fr = 2. F0. Sin1
2 = 2. 230.Sin
170,5
2 = 687,6 N
2. Chn vt liu trc thp C35 , Chn s b ng sut xon cho php l:
[ ] = 25 MPa
3. Xc nh dng knh s b trc theo cng thc .
d 1
0,2 .[ ]
3 =
14006,6
0,2.25
3 = 14 mm
Theo tiu chun ng knh ca ln nh sau : d =12, 15, 25, 25, 30 ,35, 40, .. ta
chn ng knh ti ngong trc , d = 25 mm.
Ti v tr thn trc lp b truyn xch bn tri , cc ng knh cn li ta chn nh
hnh v bn di .
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Lp: CK10TKM 21003606
4 . Chn ng knh dc trc theo cng thc : l = l1 + 2x + w
trong l1 = ( 1 1,5 )d1 = 1 .64 = 64 mm
Theo bng 10,2 chn W = 30 ( khi 10.103 N.mm T 20.103 N.mm . )
Bng 10,2 Thng s xc nh khong cch dc trc .
Mmen truyn T.103, N.mm
e, mm u ,mm f, khng nh hn ( mm )
W, ( mm )
10 40 65 30 55 35 50 20 40
T 10 n 20 45 70 35 60 40 55 25 45
T 20 n 40 50 80 40 65 45 65 25 50
.
x = 10 khe h gia bnh rng v thnh trong hp gim tc .
l = l1 + 2x + w l = 64 + 2.10 + 30 = 114 mm .
Khong cch f ta chn trong bng 10,2 khng nh hn ( 40 55 ) ,
chn f = 45 mm .
5. V biu mmen un v xon . ( trc 1 )
Trong mt phng thng ng y0z, phng trnh cn bng mmen ti A
+ = - 141,7 . 57 + 687,6.45 - RBy. 114
RBy = 200,5 N
Phng trnh cn bng theo trc Y.
+ = - RAy + 200,5 + 141,7 + 687,6
RAy = 1029,8 N .
Trong mt phng nm ngang xoz , phng trnh cn bng mmen ti A
+ = - 389,4 . 57 + RBx. 114 = 0 RBx = 194,7 N.
Ta c RBx = RAx = 194,7 N
V biu momen nh hnh v .
MYB = 200,57 . 57 = 11428,8 N.mm
MD = 687,6 . 45 = 30942 N.mm .
MXA = MXB = 194,7 . 57 = 11097,9 N.mm
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-27- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
Cc biu momen ti cc tit din nguy him ti v tr C l .
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-28- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
MC = 2 +
2 + 0,75. 122 =
= 02 + 309422 + 0,75. 14006,622
= 33234,7 N.mm
Cc biu momen ti cc tit din nguy him ti v tr D l .
MD = 2 +
2 + 0,75. 122 =
= 11432,42 + 11097,92 + 0,75. 14006,622
= 20025 N.mm
Cc biu momen ti cc tit din nguy him ti v tr A l .
MD = 0 + 2 + 0,75. 1
22 =
= 309422 + 0,75. 14006,622
= 33234 N.mm
7. Xc nh ng knh ti tit din nguy him ti C .
=
=
32.
.3 [] d =
32..
.[]
3.
d = 32.33234,7
.50
3 = 18,91 mm.
Do trc c rnh then nn ta tng ng knh 5 10 % do ;
d = 18,91.5% + 18,91 = 19,8 . Vy chn d = 20 mm
Xc nh ng knh ti tit din nguy him ti D .
=
=
32.
.3 [] d =
32..
.[]
3.
d = 32.20025
.50
3 = 15,9 mm.
Do trc c rnh then nn ta tng ng knh 5 10 % do ;
d = 15,9.10% + 15,9 = 17,49 .
Theo tiu chun ng knh ca ln nh sau : d =12, 15, 20, 25, 30 ,35, 40, .. v
chn ng knh ti ngong trc d = 25 mm. Cho nn chn ng knh thn trc
l d = 30 mm
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-29- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
i vi v tr bnh rng thng c d = 30 mm ; d = [ 30 38 ] nn ta
chn nn ta chn cc thng s ca then bng nh sau .
Tra sch Bi tp V k thut c kh tp 2 ,Trn Hu Qu Nguyn
Vn Tun , trang 7 bng 8,1 ta c cc thng s ca then bng.
Chiu rng : b = 10 mm
Chiu cao : h = 8 mm
Chiu su rnh then trn trc : t =5 mm
Chiu su rnh then trn mayo : t1 = 3,3 mm
Moment xon W= 3
32
()2
2. =
.303
32
10.5(30 5 )2
2.30= 2129 mm3
Do trc quay nn ng sut thay i theo chu k i xng
= =
=
20025
2129= 9,4 Mpa = 0
ng sut xon : =
0=
14006,6
4780 = 2,9 Mpa
Vi W0 = .3
16
()2
2.=
.303
16
10.5(305)2
2.30 = 4780 Mpa
Khi ng sut xon thay i theo chu k xon
= =
2=
2,9
2= 1,4
Ti tit din D c s tp trung ng sut l rnh then . theo bng 10,8 ta
chn .= 1,75 vi = 510 MPa 600 MPa , .= 1,5 MPa .
Theo bng 10,3 vi ng knh d = ( 20 30 ) mm
ta chn = 0,91 ; = 0,89
H s = 0,025 v = 0,0175 , tra theo hnh 2,9
Xc nh h s an ton ti D :
S =1
..
+ . =
2551,75.9,4
0,91+0
= 14,1
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-30- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
`S = 1
.
+ . =
1281,5.1,4
0,89+ 0,0175 .1,4
= 53,6
H s an ton :
S = S. S
(S )2+( S)2=
53,6.14,1
53,52+14,12 = 13,6 > [S] = 1,5, do iu
kin bn mi c tho .
i vi v tr c lp bnh ai c d = 20 mm ; d = [ 17,22 ] nn ta chn
nn ta chn cc thng s ca then nh sau .
Tra sch V k thut c kh , L Khnh in , trang 104 bng 5,2 ta c
cc thng s ca then bng.
Chiu rng : b = 6 mm
Chiu cao : h = 8 mm
Chiu su rnh then trn trc : t = 3,5 mm
Chiu su rnh then trn mayo : t1 = 2,8 mm
Moment xon W= 3
32
()2
2. =
.203
32
6.3,5(203,5 )2
2.20= 642 mm3
Do trc quay nn ng sut thay i theo chu k i xng
= =
=
33234,7
642= 51,7 Mpa = 0
ng sut xon : =
0=
14006,6
1927,3 = 7,26 Mpa
Vi W0 = .3
16
()2
2.=
.223
16
6.3,5(223,5)2
2.22 = 1927,3 Mpa
Khi ng sut xon thay i theo chu k xon
= =
2=
7,26
2= 3,6
Ti tit din D c s tp trung ng sut l rnh then . theo bng 10,8 ta
chn .= 1,75 vi = 510 MPa 600 MPa , .= 1,5 MPa .
Theo bng 10,3 vi ng knh d = ( 17 22 )
ta chn = 0,91 ; = 0,89
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-31- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
H s = 0,025 v = 0,0175 , tra theo hnh 2,9
Xc nh h s an ton ti D :
S =1
..
+ . =
2551,75.51,7
0,91+0
= 2,56
S = 1
.
+ . =
1281,5.3,6
0,89+ 0,0175 .3,6
= 20,8
H s an ton :
S = S. S
(S )2+( S)2=
2,56.20,8
2,56+20,82 = 2,54 > [S] = 1,5, do iu
kin bn mi c tho .
Bn v phc tho trc 1 .
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Lp: CK10TKM 21003606
Bn v phc tho trc 1
Phn 8 . Chn ln cho 2 trc trong hp gim tc .
A . Thuyt k cp ln trc 1 .
Khng c lc Fa , S liu thit k : RAY = 1029,8 N ; RAX = 194,7 N
RBY = 200,5 N ; RAX = 194,7 N
Lh = 5000 gi ;
S vng quay n1 = 750 vg / ph , m = 3 vng trong quay .
ng knh ln : d = 25 mm . Ti trng tnh .
1 . Ti trong hng tm tc dng ln A :
FrA = 2 +
2 = 1029,82 + 194,72 = 1048 N
Ti trong hng tm tc dng ln B :
FrB = 2 +
2 = 200,52 + 194,72 = 279,4 N .
V FrB = 297,4 N FrA = 1048 N , cho nn tnh ton chn A.
2 . Cc h s , u bng 1
3 . Do khng c Fa lc dc trc nn cc h s X = 1 ;Y = 0 .
Ti trong quy c :
Q = ( V.X. FRb + Y. Fa ).
Q = 1.1 ( FrA + 0.0 ) = 1048 N =1,048 KN
4 . Thi gian lm vic tnh bng triu vng quay .
L = 60..1
106 =
60.5000.750
106 = 225 ( triu vng ) .
5 . kh nng ti ng tnh ton :
1 = Q. 3
= 1048 . 2253
= 6374,14 = 6,374 KN .
Theo ph lc sch bi tp chi tit my T.S Nguyn Hu Lc bng 9,1 ta chn c
c bit nh , hp
K hiu 700105 , d = 25 mm 0 = 6,57 kN C = 4,24 kN
6 . Tnh li s gi lm vic . ;
0 = Q. 3
6,57.1000 = 1048 .3
L = 246,3 ( triu vng quay ) .
Lh = 106.
60.1 =
106.246,3
60.750 = 5473,3 ( gi )
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Lp: CK10TKM 21003606
B . Thuyt k cp ln trc 2 .
Khng c lc Fa , S liu thit k : RAY = 47,7 N ; RAX = 194,7 N
RBY = 794,9 N ;
RAX = 194,7 N
Lh = 5000 gi ;
S vng quay n2 = 357 vg / ph , m = 3 vng trong quay .
d = 25 mm . Ti trng tnh .
1 . Ti trong hng tm tc dng ln A :
FrA = 2 +
2 = 47,72 + 194,72 = 200,45 N
Ti trong hng tm tc dng ln B :
FrB = 2 +
2 = 794,92 + 194,72 = 818,39 N .
V FrA = 200,45 N FrB = 818,39 N , cho nn tnh ton chn B.
2 . Cc h s , u bng 1
3 . Do khng c Fa lc dc trc nn cc h s X = 1 ;Y = 0 .
Ti trong quy c :
Q = ( V.X. FRb + Y. Fa ).
Q = ( 1.FrB + 0.0 ) = FrB = 818,39 N =8,1839 KN
4 . Thi gian lm vic tnh bng triu vng quay .
L = 60..2
106 =
60.5000.350
106 = 105 ( triu vng ) .
5 . Kh nng ti ng tnh ton :
1 = Q. 3
= 818,39 . 1053
= 3860,9 N
= 3,8609 KN .
Theo ph lc sch bi tp chi tit my T.S Nguyn Hu Lc bng 9,1 ta
chn c c bit nh , hp
K hiu 700105 , 0 = 6,75 kN C = 4,24 kN vi d2 = 25 mm .
6 . Tnh li s gi lm vic . ;
0 = Q. 3
= 6,75.1000 = 818,39 .3
L = 561( triu vng
quay ) .
Lh = 106.
60.2 =
106.561
60.357 = 26190 ( gi )
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Lp: CK10TKM 21003606
5.THIT K V HP GIM TC:
A.CC CHI TIT PH :
5.1.Pht du :
- C tc dng khng cho du hoc m chy ra ngoi hp gim tc v ngn khng cho bi t bn
ngoi vo bn trong hp gim tc.
5.2.Vng chn du :
- C tc dng khng cho du m tip xc nhau. Khng cho du vo ln.
Ging vin hng dn : ThS Nguyn Vn Thnh . B mn : Thit K My Trng i Hc Bch Khoa Tp.HCM DAMH Chi Tit My.
-35- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
5.3.Cht nh v :
- C tc dng nh v chnh xc v tr ca np v thn hp gim tc trc v sau khi gia cng cng
nh lp ghp, dng hai cht nh v khi xit bulong khng lm bin dng vng ngoi ca ( do
sai lchv tr tng i ca np v thn), do loi tr c mt trong nhng nguyn nhn lm
chng hng.
c 1
d 6
L 50
5.4.Ca thm :
- C tc dng kim tra quan st cc chi tit my trong hp gim tc khi lp ghp v du vo
trong hp, c b tr trn nh hp. Ca thm c y bng np.Trn np c lp thm nt thng hi.
(Bng 18.5 trang 95 , Ti liu 2)
A (mm)
B (mm)
A1 (mm)
B1 (mm)
C (mm)
K (mm)
R (mm)
Vt S lng vt
100 75 150 100 125 87 121 M8x22 4
Ging vin hng dn : ThS Nguyn Vn Thnh . B mn : Thit K My Trng i Hc Bch Khoa Tp.HCM DAMH Chi Tit My.
-36- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
5.5.Nt thng hi :
- C tc dng lm gim p sut, iu ha khng kh bn trong v bn ngoi hp gim tc do khi
lm vic nhit bn trong hp gim tc tng ln. Nt thng hi c lp trn ca thm.
- Chn nt thng hi loi M27x2 vi cc thng s: (Bng 18.6 trang 93, Ti liu 2)
A B C D E G H I K L M N O P Q R S
M27 15 30 15 45 36 32 6 4 10 8 22 6 32 18 36 32
5.6.Nt tho du :
- C tc dng dng tho du c visau mt thi gian lm vic, du bi trn cha trong hp b
bn do bi hoc do ht mi hoc b bin cht.
- Chn nt tho du loi M20x2: (bng 18.7 trang 93, Ti liu 2)
d b m f L c q D s Do
M20x2 15 39 3 28 2.5 17.8 30 22 25.4
5.7.Que thm du :
- L chi tit dng kim tra mc du trong hp gim tc.
Ging vin hng dn : ThS Nguyn Vn Thnh . B mn : Thit K My Trng i Hc Bch Khoa Tp.HCM DAMH Chi Tit My.
-37- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
5.8.Vng mc :
- Chiu dy : S = (23) = 22 mm
- ng knh : d = (34) = 33 mm
B.THIT K V HP GIM TC :
- V hp gim tc c nhim v m bo cc v tr tng i gia cc chi tit v cc bphn my,
tip nhn ti trng do cc chi tit lp trn v truyn n. ng du bi trn v bo v cc chi tit trnh
bi bm.
- Vt liu thng dng: gang xm GX15-32
- Chn b mt lp ghp gia np hp v thn hp i qua cc trc lp cc chi tit thun tin v
d dng hn.
- B mt lp np v thn c co sch hoc mi, lp st, Khi lp c lp sn mng hoc sn
c bit.
- Mt y hp gim tc nghing v pha l tho du vi dc t 1O
- Kt cu hp gim tc c vi cc kch thc c bn sau:
Tn gi S liu
Chiu dy : Thn hp Np hp
= 12 mm 1 = 11 mm
Gn tng cng Chiu dy e Chiu cao h dc
e = 9 mm h = 50 mm 2o
ng knh Bulong nn Bulong cnh Bulong ghp bch np v thn Vt ghp np Vt ghp np v thn
d1 = 20 mm d2 = 16 mm d3 = 12 mm d4 = 10 mm d5 = 8 mm
Mt bch ghp np v thn Chiu dy bch thn hp Chiu dy bch np hp B rng bch np v thn
S3 = 22 mm S4 = 22 mm K3 = 44 mm
Kch thc gi trc ng knh ngoi v tm l vt Trc I Trc II
D = 62 D2 = 75 D3 =90 D = 72 D2 = 90 D3 =115
Ging vin hng dn : ThS Nguyn Vn Thnh . B mn : Thit K My Trng i Hc Bch Khoa Tp.HCM DAMH Chi Tit My.
-38- Sinh vin thc hin : V Nguyn c Tr
Lp: CK10TKM 21003606
Trc III B rng mt ghp bulong cnh Tm l bulong cnh
D = 120 D2 = 140 D3 =170 K2 = 44 mm E2 = 25,6 mm R2 = 15,6 C = D3/2 k 19 mm
Mt hp Khng c phn li S1 B mt rng hp
S1 = 30 K1 = 60 mm q = 82 mm
Khe h gia cc chi tit Gia bnh rng vi thnh trong hp Gia nh bnh rng ln vi y hp Gia cc mt bn vi nhau
12 mm 1 36 mm 12 mm
S lng bulong nn Z = 6