Ti liu- n C kh https://www.facebook.com/doancokhi123 Hng dn, lm
n chi tit my, n cng ngh ch to my theo yu cu. Email:
[email protected] 1 y l ti liu mnh su tm v tng hp li, do
kin thc cng nh thi gian c hn nn ti liu c th cn nhiu ch sai st, khng
ng. Rt mong bn c sau khi tham kho cho mnh chnh sa b sung ti liu hon
thin hn. Email: [email protected] Chc cc bn thnh cng.
Nhng im cn lu khi tr li n! 1.Ti sao li lp b truyn ai trc,cn nu b
truyn xch th li lp sau? Tr li:-b truyn ai thng b tr ngay sau ng c v
n cho php tc cao, lm vic m, khng n. gi c an ton hco cc chi tit my
khi quti (lucsnayf ai s trt trn bnh) -B truyn xch gn sau v n cho
php truyn lc tt hn, khng b trt nh ai, n ca n cao, lm vic vi vn tc
thp. c th truyn coogn sut cho nhiu trc. 2.u im ca bnh rng nghing?
Tr li:-Bnh rng nghing gip lm vic m hn, truyn lc tt hn (do nhiu rng
cng n khp, khi rng ny n khp cha ht th rng tip theo vo n khp), nhng
c nhc im l to ra lc dc trc, vi hgt phn i hoc br ch V th lc dc trc
hng vo nhau nn gc nghing 30-40 . Br nghing nm 8-20 . 3.Khi phn phi
t s truyn cho HGT cn m ba iu kin g? v sao? Tr li:Cn m bo 3 iu kin :
-Khi lng nh nht : do kch thc ca hp gim tc ph thuc vo khong cch trc
(aw) v chiu rng rng. -m bo th tch br ln nhng tron du nh nht (iu kin
bi trn l tt nht): bi trn cc ch n khp ca cc bnh rng, ngi ta tnh ton
Ti liu- n C kh https://www.facebook.com/doancokhi123 Hng dn, lm n
chi tit my, n cng ngh ch to my theo yu cu. Email:
[email protected] 2 cc bnh ln c nhng vo du trong hp.Nu
phn phi TST khng hp l s dn n bnh ln cp chm nhng du nhng bnh ln cp
nhanh khng nhng c vo du. Nu 2 bnh cng nhng du th bnh ln cp chm nhng
qu su trong du v dn n tn tht cng sut do khuy du. -Momen qun tnh l
thu gn nh nht. 4.Trng hp no cn chn cng sut ng c theo cng sut ng tr?
ti sao? Tr li:-Cng sut ca ng c c xc nh da tren Pt (Cng sut cn thit
trn trc ng c). Tr s ca Pt c xc nh ty thuc vo ch lm vic ca ng c v
tnh cht ti trng: -chn cng sut ng c theo cng sut ng tr khi ti trng
khng i. Pt l cng sut lm vic trn trc cng tc: Pt = Plv = F.v/1000 -Ti
trng thay i : Lc ny nhit ng c thay i theo s thay i ca ti trng. Do
vy ta tnh theo cng sut tng ng khng i ( vi mt mt nng lng do n sinh
ra tng ng vi mt mt nng lng do cng sut thay i gy nn trong cng mt thi
gian). Pt =Pt. 5.B truyn xch nn b tr trc u vo hay u ra ca HGT? ti
sao? Tr li:-B truyn xch c th b tr c u (nu dng tng tc) v ln u ra (nu
dng gim tc) 6.Cc dng hng v ch tiu tnh ca b truyn xch? Tr li:-Cc dng
hng ca b truyn xch : Mn bn l (dng hng ch yu): do chu ng sut tip xc
ln (p sut), c s xoay tng i gia cht v ng. bn l mn lm xch hay b tut,
t xch. Do cn bi trn v hn ch p sut trogn bn l. Hng do mi: t xch, on
ln r, v v>15m/s: chu ti va p ln lm m xch b long con ln v Ti liu-
n C kh https://www.facebook.com/doancokhi123 Hng dn, lm n chi tit
my, n cng ngh ch to my theo yu cu. Email:
[email protected] 3 -Ch tiu tnh ton: v mn do ng sut tip
xc gay rakhoong ssowcj vt qua mt gi tr cho php. 7.Cc dng hng v ch
tiu tnh ca b truyn bnh rng? Tr li:-Cc dng hng: Gy rng: do ng sut un
gy ra (l ch yu) ngoi ra do qu ti ln, do mi, br quay 1 chiu vt nt
xut hin pha th chu ko, br nghing v ch V gy tit din xin. Bp ngn gy
rng: tng m, dc chnh br, nhit luyn, tng bn knh gc ln gim tp trung ng
xut chn rng, ia cng nahwnx b mt rnh. Trc v mi do ng sut tip xc gy
ra Bp ngn: nhit luyn, tng gc n khp, nng cao cp chnh xc br, dng dao
c gc profin ln. Mn rng: do bi trn khng tt, mi trowngf lm vic bn. Bp
ngn: nhit luyn, gi sch mi trn lm vic, dch chnh, gim chiu cao rng,
bi trn. Dnh rng: do ti ln v vn tc cao. Bp ngn: dng nh mn rng, lm
ngui mi trng lm vic, chn vt liu thch hp, bp hiu qu nht l dng du
chng dnh. Bin dng do v rng: thp c rn thp, ti ln v vn tc nh Bong b
mt: do thm N, C ti b mt khng tt -Ch tiu: bn tip xc, bn un v qu ti
8.Cc dng hng v ch tiu tnh trc? Tr li:-Cc dng hng: gy do mi, vng trc
do khng cng v hng do dao ng ngang v xon. -Ch tiu: kim nghim bn mi,
trng hp cn thit kim nghim cng, trc quay nhanh kim nghim them doa
ng. 9.Cc dng hng v ch tiu tnh ca ln? Tr li:-Cc dng hng: bin dng d b
mt lm vic do chu ti trng va p v ta trng tnh qu ln khi khng quay hoc
quay chm. Ti liu- n C kh https://www.facebook.com/doancokhi123 Hng
dn, lm n chi tit my, n cng ngh ch to my theo yu cu. Email:
[email protected] 4 Trc (hng ch yu) v mi do ng sut tip
xc thay i khi quay Mn vng v con ln; do mi trng bn. V vng cch: do lc
ly tm v tc dng ca con alwn, quay nhanh -Ch tiu: Ti tnh: lm vic vn
tc nh (hoc ng yn) trnh bin dng d b mt. Ti ng: lm vic vi vn tc cao,
trnh trc v mi 10. Trnh t trn ln? Tr li:Chn loi Chn cp chnh xc Chn
kch thc Trng hp cn thit kim tra kh nng quay nhanh ca . Ti liu- n C
kh https://www.facebook.com/doancokhi123 Hng dn, lm n chi tit my, n
cng ngh ch to my theo yu cu. Email: [email protected] 5
11. Thng s hnh hc ca b truyn xch? Tr li:Ti liu- n C kh
https://www.facebook.com/doancokhi123 Hng dn, lm n chi tit my, n
cng ngh ch to my theo yu cu. Email: [email protected] 6
Ti liu- n C kh https://www.facebook.com/doancokhi123 Hng dn, lm n
chi tit my, n cng ngh ch to my theo yu cu. Email:
[email protected] 7 12. Cng dng, v tr t nt thng hi? Tr
li:iu ha khng kh, gim p sut trong hp c t trn np quan st hoc v tr
cao nht ca hp. 13. Cng dng ,phn loi cch la chn nt tho du? Tr
li:-Dng tho du c. -Phn loi: nt tho du tr d ch ta nhng kh bt kn nn
phi dung them m thch hp sx n chic. nt tha du cn kh ch to nhng bt kn
tt thch hp sx hang lot khi. Ch : mt y hp nn lm dc v pha l tho du t
1-2 v ngay ti ch tho du nn lm lm xung 14. Cng dng ,phn loi cch la
chn que thm du? Tr li:-Kim tra mc du trong hp. -Phn loi: n l c chp
knh, que thm du, thit b ch du (mt ch du u knh phng) 15. Cng dng
,phn loi cch la chn cht nh v? Tr li:-m bo v tr tng i ca np v thn
trc, sau khi gia cng v khi lp rp. -Phn loi: cht cn kh ch to nhng
thao tc nhanh, cht tr d ch ta nhng thao tc lu. 16. Cng dng ca vng
chn du? Tr li:Ngn khng cho du trong hp vi m trong . Vng gm 2-3 rnh
mi rnh rng 2-3 mm. khi lp vng cch mp trong hp 1-2 mm, khe h gia nh
ren vng chn du vi vi 0,4 mm 17. Cng dng ca vng pht? Tr li:Lt kn b
phn , khng cho bi bn, ht cng, tp cht vo . Khng cho du m ra ngoi hp.
Ti liu- n C kh https://www.facebook.com/doancokhi123 Hng dn, lm n
chi tit my, n cng ngh ch to my theo yu cu. Email:
[email protected] 8 18. Cng dng ca vng vung du? Tr li:Ti
du cho br trong trng hp br khng ngm du c. 19. Trnh by cch iu chnh
ln? Tr li:-Vng ngoi: iu chnh bng cch dch chuyn vng ngoi: bng m iu
chnh. Dng 2 th mi mt bn , dng them m. c nh dc trc bng np th dng
them m lp trn trc. -Vng trong: ai c+vng m. 20. Cng dng v cch to ra
khe h b tr nhit cnh ln? Tr li:-Cng dng: Lm trnh b kt do dn n. -Cch
to: cu 19. 21. Ti sao phi chn b rng bnh rng nh ln hn b rng bnh rng
ln? Tr li:-Trong qu trnh lp ghp, i khi khng th m bo n khp ng gia
bnh rng nh v bnh rng ln . Lc chiu di tip xc gia cc rng c th s nh hn
bw .Do vy khi ch to ,ta thng lm b rng ca bnh rng nh ln hn so vi b
rng bnh ln khi lp rp c sai lch th vn m bo chiu di n khp.Mt khc tng
b rng bnh nh ch khng phi bnh ln gim bt khi lng , bi chi ph v khng
lm tng momen qun tnh khi hot ng. 22. Trnh by cch chn dung sai vng
trong v vng ngoi ln? Tr li:-Vng ngoi lp lng trnh kt , v ng thi vng
ngoi quay s lm vng chu ti cc b nng cao tui bn -Vng trong lp trugn
gian c di khng trn trt trn trc -Vng trong lp theo h thng l, vng
ngoi lp theo h thng tr v ln l chi tit tiu chun phi i mua. 23. Gii
thch ngha cc k hiu dung sai ca mi lp bnh rng v trc? Tr li:Ti liu- n
C kh https://www.facebook.com/doancokhi123 Hng dn, lm n chi tit my,
n cng ngh ch to my theo yu cu. Email: [email protected]
9 -Thng dung kiu lp H7/k6 H l min dung sai ca l 7 l cp chnh xc k l
min dung sai ca trc 6 l cp chnh xc 24. Cc kch thc no cn ghi dung
sai trn bn v? ti sao? Tr li:Kch thc cn ghi dung sai: khong cch tm,
khong cch cc bu lng nn. y l kch thc lp rp v ch to cn m bo. Ch :
trong bn v lp cn ghi cc kch thc sau: -Kch thc bao: chiu di, rng,
cao bit khong khng gian cu cm my chim. -Kch thc lp ghp gia cc chi
tit: m bo mi lp khi lm vic. -Khong cch tm gia cc trc. -Khong cch cc
l bu lng nn v y l v tr lp cm my vi b phn khc. 25. Ti sao phi lm gn
tng cng cnh ch lp ln? Tr li:- tng cng. 26. Cng dng ca cc tm m ch lp
ln? Tr li:-iu chnh khe h b tr nhit cho ln. 27. Ti sao chn modun rng
phi theo tiu chun? Tr li:- d ch to. dng c ct c tiu chun ha. 28. Ti
sao phi chn ng knh thn trc v ngng trc theo tiu chun? Tr li:-ng knh
thn trc v ngng trc theo tiu chun d ch to v lp ghp. 29. Trnh by cch
chn v tnh cc kch thc ca then bng? Tr li:-Da vo ng knh trc chn kch
thc tit din then, chiu di bng 0,8-0,9 may , cc kch thc cn li tra
bng. -Sau kim nghim bn dp, vi then hoa kim nghim thm bn mn. 30. Th
no l lp theo h thng l v h thng trc? H thng no l u tin? Ti liu- n C
kh https://www.facebook.com/doancokhi123 Hng dn, lm n chi tit my, n
cng ngh ch to my theo yu cu. Email: [email protected] 10
Tr li: -lp theo h thng l l gi kch thc l thay i kch thc trc t c mi
ghp, lp theo h thng trc ngc li. u tin lp theo h thng l v l bao giwo
fcungx gia cng kh hn trc. 31. Dng hng ,ch tiu ca then bng, hoa? Tr
li: -Cc dng hng: Hng do dp b mt lm vic Hng do ct Then hoa c them
hng do mn. -Ch tiu: then bng: bn dp Then hoa; them bn mn. 32. Khong
cch nh nht t nh rng ca br n y hgt la chn nh th no, ti sao? Tr li:
-Khong cch cn ln khi br quay khng khuy ng bn, sn vt mi mn lng xung
y ln. Hgt br th khong cch ny bng 3-5 chiu dy thn hp, hgt trc vt gi
tr ny ln hn, ph thuc vo din tch ta nhit cn thit. 33. Chiu dy nh nht
ca vch HGT chn th no, ti sao? Tr li: -Chn theo chiu di rng cao hoc
khaongr cch tm ca hp phi m bo khi c c kahr nng in y khun. 34. Yu cu
khi chn vt liu bnh rng? Ti sao ngi ta chn vt liu bnh rng nh tt hn
bnh rng ln, vt liu ca bnh rng cp chm tt hn cp nhanh? Tr li: -Yu cu
: khi chn vt liu phi da vo cc yu cu c th : ti trng ln hay nh , kh
nng cng ngh v thit b ch to cng c cng nh vt t c cung cp, c yu cu kch
thc phi gn hay khng. Ti liu- n C kh
https://www.facebook.com/doancokhi123 Hng dn, lm n chi tit my, n
cng ngh ch to my theo yu cu. Email: [email protected] 11
-Nhm 1 : rn HB < 350, bnh rng thng c thng ha hoc ti ci thin. Nh
rn thp nn c th ct rng chnh xc sau khi nhit luyn, ng thi b truyn c
kh nng chy mn. -Nhm 2 : c rn HB >350 , bnh rng thng c ti th tch
, ti b mt, thm cacbon ,thm nito dng cc nguyn cng tu sa t tin nh
mi,mi nghin v.v.. Rng chy mn rt km do phi nng cao chnh xc ch to ,
nng cao cng ca trc.-Tuy nhin khi dng vt liu nhm 2 th ng sut tip xc
c th tng ti 2 ln v nng cao kh nng ti ca b truyn cng nh tng ti 4 ln
so vi thp thng ha hoc ti ci thin. -i vi hp gim tc chu cng sut trung
bnh hoc nh ,ch cn chn vt liu nhm 1, ng thi ch rng tng kh nng chy mn
ca rng ,nn nhit luyn bnh rng ln t rn thp hn rn bnh rng nh t 10 n 15
n v : H1 > H2 + (10 15 ) HB -Vi cng sut ln c th chn vt liu bnh
nh l thp nhm 2, bnh ln nhm 1 hoc c 2 u thuc nhm 2, khi nhit luyn 2
bnh nh nhau v t rn bng nhau. -Ngi ta chn vt liu bnh nh tt hn bnh ln
v :s chu k lm vic ca bnh nh nhiu hn bnh ln. -Vt liu bnh rng cp chm
ln hn cp nhanh v momen trn cc trc ca cp chm ln hn cp nhanh, do vy
ti trng ln cc rng ln hn so vi cp nhanh. 35. Trn cng mt trc nn chn
cng loi , loi then nh nhau v sao? Tr li: -Then v trn cng mt trc th
nn chn cng loi then, thun tin cho qu trnh thit k v ch to. Nu cng mt
loi then ,ta ch cn tnh ton kim nghim cho then v tr chu nguy him
hn.Trong ch to ,chn cng loi then d cho vic ch to v khng phi thay
dao ct, to nng sut.Mt khc trong qu trnh ch to c th lp ln, i then,
cho nhau trong trng hp cn thit. 36. Mi lp gia then v trc l g? Ti
liu- n C kh https://www.facebook.com/doancokhi123 Hng dn, lm n chi
tit my, n cng ngh ch to my theo yu cu. Email:
[email protected] 12 Tr li: -Lp theo h thng trc , lp c
di bo m truyn momen xon y v khng phi tho then khi tho BR hay . 37.
Cch chn ng c in? Da vo thng s no chn ng c in, cc thng s c bn ca ng
c in? Phn bit cng sut tng ng, cng sut yu cu v cng sut danh ngha ca
ng c? Tr li: -Cch chn ng c; tnh cng sut cn thit ca ng c, xc nh s b
s vn quay ca ng c. Da vo cng sut cn thit, v s vng quay ng b kt hp
vi cc yu cu v qu ti, mmen m my, phng php lp t ng c chn kch thc ng c
cho ph hp -Cc thng s chn ng c: Pc Pct nb = nsb Tmm/T TK/Tdn -Cng
sut tng ng: cng sut lm vic ch ti trogn thay i nhiu mc. -Cng sut yu
cu: cng sut xt n s thay i ca c ti trogn ln tc dng tng h gia cc chi
tit my tip xc. -Cng sut danh ngha: cng sut c chn trong s cc ti trng
trong ch lm vic n nh, thng chn cng sut ti ln nht hoc ti tc dng lu
di nht lm cng sut danh ngha. 38. Cc phng php phn phi t s truyn cho
cc cp trong HGT? Phn phi TST cho HGT v b truyn ngoi ntn? nh hng ca
vic phn phi TST ln kch thc HGT v h dn ng? Tr li: -Phng php phn phi
t s truyn: PP1 : Phn theo yu cu gia cng v hp: Vi cc hp gim tc c tiu
chun ha to thun li cho vic gia cng, ngi ta quy nh t s khong cch trc
cp chm aw2 v cp nhanh aw1 .Da trn c s m phn phi t s truyn uh cho cc
cp. PP2 : Phn theo yu cu bi trn: bi trn ch n khp ca cc bnh rng
trong hp gim tc, ngi ta tnh ton cc bnh ln c nhng vo du ng trong hp.
Ti liu- n C kh https://www.facebook.com/doancokhi123 Hng dn, lm n
chi tit my, n cng ngh ch to my theo yu cu. Email:
[email protected] 13 C = dw1/dw2 = 1 th br ln ca hgt c
ngm trogn du bng nhau m cp nhanh quay nhanh hn gy tn tht do khuy du
do vy nn chn C > 1 thc t 1 C 1,3 PP3 : Phn theo yu cu gn nh : Vi
hp gim tc bnh rng tr loi nng th ch tiu v kch thc v khi lng li c
ngha quan trng.V vy trong trng hp ny ngi ta phn uh cho cc cp xut
pht t iu kin tng khong cch trc l nh nht. U1 = (1.2 1.3 ) U2 -Phn
phi t s truyn cho HGT v b truyn ngoi: Ut = nc/nlv = Uh.Un
Trong : nc: s vng quay ca ng c chn, vg/pht. nlv: s vng quay ca
trc cng tc un: t s truyn ca b truyn ngoi. uh: t s truyn ca hp gim
tc. Theo bng 2.4 [1] chn s b un uh = ut/un Phn phi t s truyn cho cc
cp b truyn trong hp gim tc, sau tnh li un theo cng thc: un =
ut/u1.u2 -nh hng ca vic phn phi TST ln kch thc HGT v h dn ng Vic
phn phi t s truyn nh hng rt ln n kch thc cng nh khi lng ca hgt v h
dn ng, do cn phi phn phi t s truyn m bo kch thc, khi lng nh v bi
trn cc br n khp. 39. Nu cch chn hp l cng sut v s vng quay ng c? Tr
li: -Cc thng s chn ng c: Pc Pct nb = nsb Tmm/T TK/Tdn 40. Ti sao
phi kim tra m my v qu ti cho ng c? trng hp no khng phi kim tra qu
ti cho ng c? Ti sao? Tr li: Ti liu- n C kh
https://www.facebook.com/doancokhi123 Hng dn, lm n chi tit my, n
cng ngh ch to my theo yu cu. Email: [email protected] 14
-Khi m my, momen qu ti khng c vt qu momen khi ng ca ng c ( T <
TK) nu khng ng c s khng chy. -Nu ang lm vic ch n nh no m ng c b qu
ti v bt k l do no, s vng quay ca ng c s gim . Momen qu ti d ch tc
dng trong mt thi gian ngn khng c vt qu momen cc i Tmax ca ng c, nu
khng ng c s dng li hoc b chy nu khng kp ngt ngun. -. 41. Nu vai tr
v v tr ca hp gim tc trong h thng dn ng? Tr li: -Hgt dng truyn momne
xon v gim tc . -V tr: trung gian gia ng c v trc cng tc. 42. C s xc
nh h s chiu rng bnh rng khi thit k b truyn bnh rng? Tr li: - xc nh
h s chiu rng rng ba l da vo v tr ca bnh rng i vi cc trong hp gim tc
(bng 6.6), ti trng cn truyn, s b tr (cng xn,i xng,bt i xng), cng
vng ca trc v , rn mt rng cp chnh xc ch to bnh rng. Khi tng ba s lm
gim c kch thc hoc khi lng ca b truyn, nhng li i hi nng cao cng v
chnh xc ch to ,nu khng s lm tng thm s phn b khng u ti trng trn chiu
rng vnh rng v nh vy nh hng c li ca vic tng chiu rng vnh rng khng b
c nh hng c hi do vic tng thm s phn b khng u ti trng gy ra. 43. Nu
cc bin php x l khi kim tra sc bn tip xc ca bnh rng khng tha mn? Tr
li: -Khi sc bn tip xc khng tha mn, nu chnh lch nhiu c th chn li vt
liu hoc thay i khong cch trc v kim nghim li.Tuy nhin nu H > [ H]
khong 4 % th c th gi nguyn cc kt qu tnh ton v ch cn tnh li chiu rng
vnh rng bw. bw = ba.aw.( H / [ H])2 44. Nu c s chn gc nghing ca bnh
rng nghing? Ti liu- n C kh https://www.facebook.com/doancokhi123
Hng dn, lm n chi tit my, n cng ngh ch to my theo yu cu. Email:
[email protected] 15 Tr li: -Bnh rng nghing gip lm vic m
hn, truyn lc tt hn (do nhiu rng cng n khp, khi rng ny n khp cha ht
th rng tip theo vo n khp) u im ny t l thun vi ln ca gc nghing rng,
tuy nhin khi gc nghing nh hn 8 thfi khng tn dng c ht u im ca br
nghing, khi gc nghing ln hn 20 th lc dc trc ln do vy vi hgt phn i
hoc br ch V th lc dc trc hng vo nhau nn gc nghing 30-40 . Br nghing
nm 8-20 . 45. Trng hp no phi chn xch nhiu dy? s dy xch ti a l bao
nhiu? gii thch? ti sao thng chn s mt xch chn? Tr li: -Trong trng hp
tnh ra bc xch ln hn bc xch ln nht cho php (P>Pmax) hoc mun c bc
xch nh hn, c th dng xch nhiu dy. -S dy xch ti a l 4. -S amwts xch
chn m bo rng trn a xch mn u 2 bn, m bo tui th. 46. Trnh by trnh t
ngha v ni dung ca cc bc tnh thit k trc theo sc bn mi? Tr li: -Chn
vt liu. -Tnh thit k trc. Xc nh ti trng ca cc b truyn tc dng ln trc.
Tnh s b ng knh trc. Xc nh khong cch gia cc gi v im t. Xc nh ng knh
v chiu di trc. -Tnh kim nghim trc v bn mi: trong qu trnh tnh ton ng
knh trc trn , chng ta cha xt n mt s yu t nh hng n bn mi ca trc nh c
tnh thay i ca chu k ng sut, s tp trung ng sut, yu t kch thc , cht
lng b mt v.v v vy sau khi xc nh kt cu trc , cn tin hnh kim nghim
theo bn mi. Ti liu- n C kh https://www.facebook.com/doancokhi123
Hng dn, lm n chi tit my, n cng ngh ch to my theo yu cu. Email:
[email protected] 16 -Tnh kim nghim trc v bn tnh: phng
kh nng bin dng do qu ln hoc ph hng do qu ti t ngt (chng hn khi m
my) cn tin hnh kim nghim trc v bn tnh. -Tnh kim nghim trc v cng(nu
cn). -Tnh cng un: khi vng f qu ln s lm cho cc bnh rng n khp b
nghing, lm tng s phn b khng u ti trng trn chiu rng vnh rng, cn khi
gc xoay qu ln s lm kt cc con ln trong cc . -Tnh cng xon : c ngha
quan trng i vi cc c cu phn , my phay rng, v chuyn v gc lm gim chnh
xc ch to;i vi trc lin bnh rng v trc then hoa chuyn v gc lm tng s
phn b khng u ti trng trn chiu rng vnh rng. 47. Cc nhn t nh hng n sc
bn mi ca trc, cc bin php nng cao sc bn mi? Tr li: -Trc thng xuyn lm
vic qu ti, thit k nh gi khng ng ti trng tc dng. -Tp trung ng sut do
kt cu gy nn (gc lng, rnh then, l) chat lng ch to xu (gia cng, nhit
luyn km...) -S dng khng ng k thut ( trc iu chnh khng ng, khe h cn
thit qu nh) -Bp nng cao sc bn mi: chn vt liu tt, gia cng t bng cao,
nhit luyn t yu cu k thut, tng ng knh trc, s dng then hao thay then
bng. iu chnh khe h b tr nhit cho . Kt cu hp l trnh tp trugn ng sut.
48. Ti sao cc rnh then trn trc c b tr cng mt ng sinh , nu dng n 2 3
then trn cng mt tit din th trc c b tr nh th no? Tr li: -Cc rnh then
trn trc c b tr cng mt ng sinh nhm to iu kin gia cng thun li : c th
gia cng c 2 rnh then trn cng mt ln chy dao, khng phi g t li , khng
phi thay dao nu then cng loi. Nu phi dng nhiu then trn cng mt tit
din, ta phi b tr u trn Ti liu- n C kh
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ng trn tit din. V d , khi s dng 2 then t cch nhau 180o th khi mi
then c th tip nhn 0.75T. 49. ln trong hp c tnh chn theo ch tiu no?
Ti sao? Nu cc bin php x l kim nghim m khng kh nng ti ng? Tr li: -
ln trong hp c tnh chn theo kh nng ti ng v kim nghim li kh nng ti
tnh. -\Ch tiu: Ti tnh: lm vic vn tc nh (hoc ng yn) trnh bin dng d b
mt. Ti ng: lm vic vi vn tc cao, trnh trc v mi -Bp x l kim nghim m
khng kh nng ti ng:Chn li loi, kiu v kch thc : Tng c , chng hn t c
nh tng ln c trung hoc trung rng (cng ng knh trong d, nhng tng ng
knh ngoi D v b rng. Dng loi khc c tnh nng tng ng nhng c kh nng ti
ln hn, vd : thay bi a , bi -chn bng a cn Dng 2 cng lc. Cn ch : do
khe h hng tm khc nhau, mt c th b qu ti , kia thiu ti. Do phi chn c
cp chnh xc cao hn, khi kh nng ti ng ca 2 c th t ti 1,8 ln so vi 1 .
Tng s dy con ln i vi chn. Dng 2 dy c th lm tng kh nng ti ng so vi
mt dy. Gim tr s ca Cd bng cch gim thi gian s dng , chng hn c th ly
thi gian s dng bng mt na thi hn lm vic ca hp hoc ch cho lm vic cho
n khi i tu hoc trung tu,khi s thay . 50. Tnh cng ngh trong bn v? Tr
li: -Ti sao khi ghp 2 v hp ngi ta thng np bulong ngc ln.?( khi lp t
hay tho s d dng tho mi hn i vi ng cng nhn...) -Khi lm cht nh v ta
ln chn v tr t cht ntn ?( m bo khong cch cc cht l xa nht khi nh v l
tt nht) Ti liu- n C kh https://www.facebook.com/doancokhi123 Hng
dn, lm n chi tit my, n cng ngh ch to my theo yu cu. Email:
[email protected] 18 -Khi chn ln. tai sao chn bi (khi lc
dc trc khng c),ti sao chon chn (khi c lc dc trc nh). -Th hin kh nng
"d" gia cng,kim tra (hay o lng) m bo yu cu k thut v kinh t. 51.
Quan h gia gi tr momen xon trn cc trc ca HGT. Momen xon nh hng th
no ln kch thc cc b truyn, kch thc hp gim tc v cc yu t khc? Tr li:
-Momen xon trn mt trc t l nghch vi tc quay ca trc .Trc quay cng chm
th momen xon cng ln. Do y l hp gim tc nn trc sau c tc thp hn n ln
so vi trc trc (vi n l t s truyn ca 2 trc) , do vy cc trc v sau ca
hp gim tc s chu momen xon ln hn trc trc. -B truyn rng : momen xon
ln s lm tng khong cch trc lm tng kch thc ca b truyn v i hi s dng vt
liu tt , dn n tng gi thnh. -Trc : momen xon ln s tng ng knh trc, dn
n tng kch thc v gi . 52. u nhc im v phm vi s dng ca HGT c yu cu
thit k.So snh b truyn ai thang ,ai dt , b truyn ai v b truyn xch?
Tr li: -Khai trin: HGT n gin nhng bnh rng b tr khng di xng nn ti
trng phn b khoogn u trn rng do bnh rng cn nhit luyn rn cao chu ti
trng thay i nhng kh nng chyaj mn rt km -Phn i: cng sut c phn i cp
nhanh (chm) bnh rng i xng nn ti trng phn b u trn rng , cc . Ti cc
tit din nguy him ca trc trung gian ch chu 1 na cng sut truyn. Nh hn
hgt khai trin 20%. Nhng chiu rng tang v phc tp s lng chi tit cng nh
gia cng tng. -ng trc: ng tm trc va v ra trugnf nhau nn gim bt c
chiu di hgt v nhiu khi gip b tr kt cu gn hn. Tuy nhin hgt ng trc c
nhc im l kh nng ti ca cp nhanh khng dng ht Ti liu- n C kh
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v v tc dng vo cp chm ln hn nhiu so vi stair tc dng vo cp nhanh. Phi
b tr cc ca cc trc ng tm bn trong hgt lm phc tpaj kt cu gi gy kh
khan bi trn. Khong cc gi ca trc trung gian ln, lm trc phi tng ng
knh m bn, cng. -Cn tr v cn: truyn momen v chuyn ng quay gia cc trc
giao nhau. Nhc im ca loi hp ny l gi ch to t, ch ta kh khan v khi
lng, kch thc ln -Trc vt: truyn momen v chuyn ng gia cc trc cho
nhau. Kch thc nh gn, t s truyn ln v lm vic m. Tuy nhin n c 1 s nhc
im sau: Hiu sut thp, nguy him v dnh, mn rng khi lm vic lu di, dng
kim lo mu him v t tin. 53. Nhc im ca bnh rng lin tr? Cc phng php c
nh chi tit ln trc. Tr li: -Br lin trc pahir ch to br v trc cng 1 vt
liu trong khi yu cu c tnh ca trc v br khc nhau, khi thay br hay
thay trc th phi thay c 2 gy tn km. -Cc phng php c nh trc: Theo phng
tip tuyn: dng mi ghp then, then hoa v ghp di. Theo phng dc trc: vai
trc, g trc, bc chn, mt cn, bu lng v vng m hm, vng hm l xo, ghp di,
then vt. 54. So snh u nhc im v phm vi s dng ca cc loi ln? Khi no
dng ty ng? Tr li: Ti liu- n C kh
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- bi mt dy chu c lc hng tm , ng thi chu c lc dc trc khng ln , cho
php nghing di , lm vic vi s vng quay cao, gi thnh thp nht. - bi lng
cu 2 dy : ch yu chu lc hng tm nhueng co th chu c lc dc trc nh. u im
ni bt ca n l cho php trc nghing di 2 so vi vng , thch hp cc trc di
cc l lp kh m bo ng tm. Trng hp cn chu ti trng ln hn v ti trng va p
, c th thay bi lng cu 2 dy bng bi a lng cu 2 dy, tuy nhin gi thnh t
hn. - a tr ngn thng c dng tip nhn lc hng tm. Khng cho php trc lch
nhng kh nng ti v cng ln hn bi mt dyv thun li trong lp ghp ( cc vng
c th tho ri theo phng dc trc). a tr ngn chu lc hng tm l ch yu nhng
c th tip nhn lc dc trc 1 pha kh nh hoc lc dc trc 2 pha kh nh. - bi
- chn : c th tip nhn ng thi lc hng tm v lc dc trc mt pha , khi b tr
2 i nhau c th hn ch di ng dc trc v c hai pha. So vi bi chn, a cn
chu c ti trng ln hn, cng cao hn, thun tin hn khi tho lp, gi thnh h
hn nhng kh nng quay nhanh km hn. - bi chn ch chu lc dc trc , lm vic
vi vn tc thp v trung bnh, khng cho php cc vng b lch. - ty ng: dng
trong hgt phn i, cc trc quay nhanh hn cho php trc di chuyn dc trc b
li sai s v gc nghing ca rng. m bo cho 2 cp br vo n khp. hgt trc vt
ngi ta b tr 1 u 2 a cn v 1 u l ty ng cho php trc di chuyn trong
trng fhowpj dn n v nhit. 55. Lc ca khp ni tc dng ln trc : bn cht
,cch xc nh tr s, phng chiu. Tr li: -Do tn ti s khng ng tm ca cc trc
c ni, ti trng ph s xut hin. Ti liu- n C kh
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-Tr s : lc hng tm Fr = (0.20.3) Ft , vi Ft l lc vng trn khp ni.
-Phng chiu : Chiu c th ly bt k ph thuc vo sai s ngu nhin khi lp ghp
ni trc . Nhng trong s tnh ton nn chn th no chiu ca lc Fr lm tng ng
sut v bin dng do lc vng chi tit quay khc c lp trn trc gy nn. 56.
Tra cc chi tit tiu chun? Tr li: - ln: ng knh trong (lc lm trc phi
chn tit din ti ln tiu chun: 15,17,20,25,30,...tr ln tng 5 mm) , Cc
thng s, tui th v k hiu tra bng P2.7 trang 254 ti trang 268 [1].
-Vng chn du: Hnh 15-22 trang 53 [2], b rng a t 6 n 9 mm, bc nhy gia
2 nh t 2 n 3 mm, s khe h ti thiu 3 khe. -Vng pht: trang 50 [2] ng
knh trc ti ch lp pht chia ht cho 5. -V hp gim tc: Bng 18-1 trang 80
[2] nn v ra nhp v kim tra cc kch thc D3,D2,k,k2,k3... c tha cc cng
thc cho hay khng. -Que thm du: Hnh 18-11 trang 96 [2] tc c cc kch
thc u tiu chun , ch c L l ty . -Np quan st: Hnh 18-5 trang 92 [2]
thng thng chn ci b nht (nhn cho n m) -Nt thng hi: Hnh 18-6 trang 93
[2] ch c 2 loi, thng thng chn M48x3. -Nt tho du: Hnh 18-7 trang 93
[2] nhm chng kch thc va vn, u c khng chm t, hoc vt qua khi thnh di
v hp. Vt liu CT3. -Bnh rng: Xt xem c gia cng lin trc hay khng xem
hnh 14-4 trang 11[2] , di t vng chia n chn rng bng 1,25m, t vng
chia n nh rng bng m (m l mun) cc kch thc ( , D , D0 , d0 ,C) t
trang 13 n tran 14[2] , xem hnh 14-8 trang 13[2]. Thp C45 ti ci
thin. -ng lt v np : b dy ng lt chn t 5 n 8mm, np c cc kch thc D3 D2
ghi trong bng 18-1 trang 80[2] Ti liu- n C kh
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-Vng l xo: trn trc bng 15-7 trang 34[2], trn l bng 15-8 trang
35[2]. -Bu lng + ai c: P3.4-p3.6 trang 216-217[2] ;Hnh 4.8 trang
68[3], Hnh 4.12 trang 76[3]. ISO4610. -m vnh: b ngang nh hn ai c c
3 tiu chun(nh,va,ln), dy 0,15d, nghing v bn tri 1 gc 70-85 . -Then:
Then bng tra bng 9.1a[1] , chiu di then xem phn ch thch pha di hnh
. -Bu lng vng: Bng 18-3a trang 89[2]. da vo trng lng hp gim tc m
chn (nhm nhm i khi ng qu to) -Cht nh v: hnh cn nghing 1 18-4b trang
91[2]. -Dung sai khong cch trc: Tham kho trang 172[2], tra bng
21-22 trang 170[2] i vi cp bnh rng tr, 21-23 i vi cp bnh rng cn.
-Dung sai hnh dng v v tr: trang 136[2] 57. Kt cu br? Tr li: Ti liu-
n C kh https://www.facebook.com/doancokhi123 Hng dn, lm n chi tit
my, n cng ngh ch to my theo yu cu. Email:
[email protected] 23 Bnh rng thng gm 3 phn: vnh rng, a
nan hoa, may. - Vnh rng: Chu ti trc tip do rng truyn n. dy vnh rng
. + i vi bnh rng tr: = (2,5 . . 4)m 8 . . 10mm + i vi bnh rng nn: =
(2,5 . . 3)mte 8 . . 10mm H s nh dng cho bnh rng ln. - a nan hoa:
dng ni may vi vnh rng. Chiu dy ca a c chn + Bnh rng tr: C (0,2 . .
0,3)b. + Bnh rng nn: C (0,3 . . 0,35)b. - May: c lp vo trc v truyn
mmen xon t trc sang bnh rng hoc ngc li. bnh rang trn trc khng b o,
chiu di may cn ln hn chiu di then, thng c chn theo ng knh d ca b mt
lp ghp: lmay = (0,8 . . 1,8)d h s nh dng cho mi ghp cht v h s ln
dng cho mi ghp di ng. May cn cng v bn, do thng chn: D = (1,5 . .
1,8)d h s nh dng khi bnh rng ch to bng thp v khi s dng lp ghp di, h
s ln dung khi lp ghp bng then. 58. Ti sao trong hgt b rng br cn ca
br ch ng bng br b ng, cn br tr th b rng br ch ng ln hn b rng br b
ng? Tr li: -Br tr n khp nh mt bn rng, do b br br ch ng phi ln hn b
rng br b ng, ngoi ra cn m bo tit kim vt liu, chi ph. -Br cn th n
khp l mt cn, do b rng br ch ng nng b rng br b ng. Ti liu- n C kh
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