Ch6 Truyen Dong Banh Rang

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Ch6 Truyen Dong Banh Rang

Text of Ch6 Truyen Dong Banh Rang

  • 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