ch6 truyen dong banh rang
DESCRIPTION
Ch6 Truyen Dong Banh RangTRANSCRIPT
-
1Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
Chng 6 B TRUYN BNH RNG1. Khi nim chung
Cng dng: b truyn bnh rng truynchuyn ng v mmen xon gia 2 trcgn nhau, lm vic theo nguyn l n khp
-
2Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
Phn loi theo vi tr cc trc:
bnh rng tr bnh rng cn bnh rng tr cho
Phn loi theo s phn b cc rng:
bnh rng ngoi bnh rng trong
-
3Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
Phn loi theo phng rng so vi ng sinh:
rng thng rng nghing
rng cong rng ch V
-
4Phn loi theo bin dng rng: bin dng thn khai, bin dng cycloid, bin dng Novikov
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
Base Circle
Involutetooth profile
-
5Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
Phn loi theo chiu nghing ca rng: nghing tri, nghing phi
Phn loi theo h o lng: bnh rng h mt, bnh rng h anh
u im:
Kch thc nh, kh nng ti ln
T s truyn khng i
Hiu sut cao, tui th cao
Nhc im:
Ch to phc tp, i hi chnh xc cao
Gy n khi lm vic vn tc cao
N
g
h
i
n
g
p
h
i
N
g
h
i
n
g
t
r
i
-
6Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
-
7Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
2. Thng s hnh hc bnh rng tr
2.1 Bnh rng tr rng thng
Bc rng
Mun m (tiu chun tra trang 195)
Dy 1: 1 1.25 1.5 2 2.5 3 4 5 6 8 10 12 16 20 25
Dy 2: 1.125 1.375 1.75 2.25 2.75
3.5 4.5 5.5 7 9 11 14 18 22
S rng Z (Zmin=17)
ng knh vng chia
Khong cch trc
mp .=
( )22
2121 ZZmdda +=+=
Zmd .=
-
8Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
2.2 Bnh rng tr rng nghing
Bc php pn Bc ngang
Mun php mn (tiu chun trang 195)
Mun ngang vi l gc nghing rngbnh rng nghing chn 80 200bnh rng ch V chn 300 400
ng knh vng chia
ng knh vng nh
ng knh vng chn
Khong cch trc
cosn
sp
p =
cosn
sm
m =
cosZm
Zmd ns ==
na mdd 2+=ni mdd 5.2=
( ) ( )cos22
2121 ZZmZZma ns+=+=
-
9Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
3. Lc tc dng v ti trng tnh
3.1 Phn tch lc tc dng trong bnh rng
Lc n khp Fn c phn tch thnh 3 lc theo 3 phng vung gcnhau.
Lc vng Ft c phng vung gc trc (khng ct trc)
Lc hng tm Fn c phng vung gc trc
Lc dc trc Fa c phng song song trc
Lc n khp
1
12dTFt =
tanta FF =
coscos nt
nF
F =
costan nt
rF
F =
-
10
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
Ft1= - Ft2Fr1= - Fr2Fa1= - Fa2
-
11
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
Chiu ca cc lc:
Lc Ft : trn bnh dn ngc chiu quay, trn bnh b dn cng chiuquay
Lc Fr : lun lun hng vo ng tm trc bnh rng
Lc Fa : lun lun hng vo mt rng lm vic
3.3 Ti trng tnh
Ti trng tnh (dng tnh ton) bao gm ti trng danh ngha v titrong ph pht sinh trong qu trnh n khp
Pt=KPdn hoc Tt=KTdn hoc Ft=KFdnKhi tnh ng sut tip xc K=KH= KH KHV KHKhi tnh ng sut un K=KF= KF KFV KFVi KH, KF : h s tp trung ti trng (bng 6.4)
KHV, KFV : h s ti trng ng (bng 6.5 v 6.6)
KH, KF : h s xt n phn b ti khng u gia cc i rng(trang 213)
-
12
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
4. Hiu sut ca b truyn bnh rng
Hiu sut
Vi P1 l cng sut trn trc dn
P2 l cng sut trn trc b dn
Thng thng i vi
b truyn bnh rng tr bi trn lin tc bng du = 0,970,99 b truyn bnh rng tr bi trn nh k bng m = 0,930,95 b truyn bnh rng cn bi trn lin tc bng du = 0,950,98 b truyn bnh rng cn bi trn nh k bng m = 0,920,94
1
2
PP=
-
13
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
5. Vt liu v nhit luyn bnh rng
Yu cu: bn cao, cng cao,r tin
Vt liu: thng chn gang hoc thp (ccbon, hp kim)
Nhit luyn: thng ho, ti ci thin (HB350)
c im:
HB350 nhit luyn sau ct gt nn cn gia cng tinh li sau nhit luyn
chy mn tt th H1 > H2 + (10~15)HB
-
14
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
6. ng sut cho php
6.1 ng sut tip xc
Thp
Khi tnh ton thit k
Vi 0Hlim, sH tra bng 6.13h s tui th vi
(nu KHL
-
15
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
Bnh rng tr rng thng [H] = min([H1],[H2]) Bnh rng tr rng nghing [H] = 0,45([H1]+[H2])Gang
Gang xm [H] = 1.5 HBGang c bn cao [H] = 1.8 HB Phi kim loi
Tectolic [H] = 45 ~ 60 MPaLignofon [H] = 50 ~ 60 MPa
-
16
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
6.2 ng sut unThp
Khi tnh ton thit kVi 0Flim, sF tra bng 6.13h s tui th vi(nu KFL350
Nu ti thay i theo bc
Khi tnh ton kim nghim
Gang
Phi kim loi
[ ]F
FLFF s
Klim0 =
Fm
FE
OFFL N
NK = 610.5=FON
6=Fm9=Fm
ii
mi
FE tnTT
cNF
=
max60
[ ]F
FCxRFLFF s
KYYYK lim0=
[ ] MPaF 2015 =[ ] [ ]
KsF
1=
-
17
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
7. Dng hng v ch tiu tnh
7.1 Dng hng
C 5 dng hng xy ra trong b truyn bnh rng
Trc r b mt rng do s thay i ca ng sut tip xc
Trc r b mt
-
18
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
Gy rng do qu ti hoc do s thay i ca ng sut un
Gy rng
-
19
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
Mn rng do trt bin dng
Dnh rng do nhit v p sut cc b cao ti vng tip xc
Bong b mt rng do nhit luyn km
Bin dng do b mt rng do c tnh vt liu km
Dng hng c bn: trc r b mt v gy rng do mi
7.2 Ch tiu tnh
Tnh theo ng sut tip xc trnh trc r b mt rng
Tnh theo ng sut un trnh gy rng do mi un
-
20
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
Trng hp b truyn c che kn v bi trn tt
Thit k theo ch tiu tip xc
Kim tra bn theo ch tiu un
Trng hp b truyn h v bi trn km
Thit k theo ch tiu un
Kim tra bn theo ch tiu tip xc
8. Tnh bn b truyn bnh rng tr rng thng
8.1 Tnh theo ch tiu tip xc
Tnh ng sut tip xc khi Fn v tr tm n khp
Cng thc Hetz cho 2 hnh tr tip xc ngoi
H s vt liu
[ ]HnMH qZ = 2)1()1([
2221
212
21
+= EEEEZM
-
21
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
Bn knh cong tng ng
Ti trng phn b
Vi
Thay tt c vo cng thc Hetz
sin12
sin2
sin2111
11212 uu
ddd www
===
H
nHn l
FKq =
2Zbl wH = 3
4 =Z
cos2
cos 1
21
ww
H
H
tHn db
ZTKl
FKq ==
-
22
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
Cng thc kim tra bn
Vt liu thp thp
: ng knh vng chia (ln) bnh rng 1
Cng thc thit k (Khong cch trc)
Vi tra bng 6.15
32
1
][)1(50
u
TKua
Hba
Hw
=
w
wba a
b=
][)1(2 11
Hw
H
w
HMH ub
uTKd
ZZZ =MPaZM 275=
76.1)202sin(
22sin2
0 === wHZ 96.03
2.143
4 === Z
1wd
-
23
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
8.2 Tnh theo ng sut un
Tnh ng sut khi lc Fn nh rng
ng sut danh ngha chn rng
ng sut chn rng
K : h s tp trung ng sut chn rng
cos'cos'cos/ tnt
FFF ==
cos'sin'sin/ tnn
FFF ==
nu =
Knu )( =
K
sbF
sblFK
AF
WlF
w
t
w
tn
u
t .cos
'sincos
'cos6. 2//
=
=
w
tFF
w
tFmb
FYKKsm
sml
bmFK =
=
.
cos'sin
cos'cos6
. 2
-
24
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
H s dng rng
YF ph thuc s rng Z v h s dch chnh x, khng ph thuc mun m
Cng thc kim tra bn
Cng thc thit k (m un)
Vi tra bng 6.16
Thng chn Z1 = 17 rng
3 21
1
][2
Fbd
FF
ZYTKm
][ Fw
FtFF mb
YFK =
1w
wbd d
b=
2092.09.272.1347.3 xZx
ZYF ++=
K
sm
smlYF .cos
'sincos
'cos62
=
-
25
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
9. Tnh bn b truyn bnh rng tr rng nghing
9.1 c im trong tnh ton
Lm vic m
Cng ti trng trn rng b
ng tip xc nm nghing trn mt rng
Thay bnh rng nghing bng bnh rng tr rng thng tng ng
ng knh bnh rng tng ng
S rng bnh rng tng ng
2cosddv =
3cosZZv =
-
26
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
9.2 Tnh theo ng sut tip xc
Cng thc thit k
Cng thc kim tra bn
Vi
32
1
][)1(43
u
TKua
Hba
Hw
=
][)1(2 11
Hw
H
w
HMH ub
uTKd
ZZZ =
)2sin(cos2
twHZ
=
1=Z 6.1=
-
27
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
9.3 Tnh theo ng sut un
Cng thc thit k
Cng thc kim tra bn
Vi
321
1
][
2
Fbd
FFn Z
YYYTKm
][ Fw
FtFF mb
YYYFK =
2092.09.272.1347.3 xZ
xZ
Yvv
F ++=
1=Y
1401
0 =Y
-
28
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
10. Truyn ng bnh rng nn
10.1 Thng s hnh hc
M un trn mt mt ln me(tiu chun trang 195)
S rng Z
ng knh vng chia ngoi
M un trung bnh
ng knh vng chia trung bnh
H s thng chn
Zmd ee =
)5.01( beem mm =
Zmd mm =
ebe R
b= 3.025.0 =be
-
29
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
B rng bnh rng b
Chiu di ng sinh mt nn chia
Gc nh nn chia
10.2 Lc tc dng v ti trng tnh
10.2.1 Lc tc dng
Lc n khp Fn c phn tch thnh 3 lc theo 3 phng vung gcnhau.
Lc vng Ft c phng vung gc trc (khng ct trc)
Lc hng tm Fr c phng vung gc trc
22
212
ZZm
R ee +=
=
=
uZZ 1arctanarctan
2
11 ( )uZ
Z arctanarctan1
22 =
=
021 90=+
1
121
2
mtt d
TFF ==
1121 costan tar FFF ==
-
30
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
Ft1 = - Ft2Fa1 = - Fr2Fr1 = - Fa2
-
31
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
Lc dc trc
Chiu ca cc lc:
Lc Ft : trn bnh dn ngc chiu quay, trn bnh b dn cng chiuquay
Lc Fr : lun lun hng vo ng tm trc bnh rng
Lc Fa : lun lun hng ngc vi nh nn
10.2.2 Ti trng tnh
Khi tnh ng sut tip xc K=KH= KH KHVKhi tnh ng sut un K=KF= KF KFVVi KH, KF : h s tp trung ti trng (bng 6.18 v cng thc 6.105)
KHV, KFV : h s ti trng ng (bng 6.17)
1121 sintan tra FFF ==
-
32
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
10.3 Tnh bn b truyn bnh rng nn rng thng
10.3.1 c im tnh ton
ng sut tip xc v ng sut un khng thay i dc theo chiu dirng
Do iu kin n khp kh khn nn a vo h s hiu chnh 0.85
Thay bnh rng nn rng thng bng bnh rng tr rng thng tngng
ng knh bnh rng tng ng
S rng tng ng
T s truyn tng ng
Mmen xon trn bnh rng tg ng
cosm
vd
d =cos
ZZv =2uuv =
1
11 cos
TT v =
-
33
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
10.3.2 Tnh theo ng sut tip xc
Cng thc thit k - Chiu di ng sinh mt nn chia (6.116b)
Cng thc kim tra (6.114)
322
12
][)1(85.015.47
Hbebe
He u
TKuR
+=
][85.0
122
1
21
Hm
HHMH ubd
uTKZZZ +=
-
34
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
10.3.3 Tnh theo ng sut un
Cng thc thit k - Mun trn mt mt ln (6.119c)
Vi
Cng thc kim tra (6.118 )
( )3 2111
5.01][85.02
beFbd
FFe Z
YTKm
][85.0
11F
m
FFF bm
YFK =
1mbd d
b=
-
35
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
11. Trnh t thit k b truyn bnh rng (thit k theo tip xc)
11.1 Thit k b truyn bnh rng tr
Thng s ban u: cng sut P1, s vng quay trc dn n1, t s truyn u, iu kin lm vic.
1. Chn vt liu, phng php nhit luyn
2. Xc nh ng sut tip xc v ng sut un cho php
3. Chn h s ba Chn s b h s KH4. Tnh khong cch trc aw (lm trn theo tiu chun nu thit k hp
gim tc tiu chun)
5. Chn mun mn = (0.010.02)aw6. Xc nh s rng. Tnh chnh xc u
7. Tnh vn tc vng v. Chn cp chnh xc ch to bnh rng
8. Xc nh li h s KH . Nu sai lch qu 5% so vi gi tr s b th trli bc 4
-
36
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng
9. Kim tra theo bn un
10.Kim tra qu ti
11. Xc nh chnh xc cc thng s hnh hc ca b truyn
12. Tnh lc tc ng ln trc
11.2 Thit k b truyn bnh rng nn
1. Chn vt liu, phng php nhit luyn
2. Xc nh ng sut tip xc v ng sut un cho php
3. Chn h s be Chn s b h s KH4. Xc nh chiu di cn ngoi
5. Chn Z1P. Xc nh me. Tnh chnh xc t s truyn
6. Xc nh mun trung bnh. Tnh vn tc vng. Chn cp chnh xc.
7. Xc nh li h s KH . Nu sai lch qu 5% so vi gi tr s b th trli bc 4
8. Kim tra theo bn un
-
37
10.Kim tra qu ti
11. Xc nh chnh xc cc thng s hnh hc ca b truyn
12. Tnh lc tc ng ln trc
HT CHNG 6
Chi Chi tititt mmyy TS TS PhanPhan TTnn TTngng