3.6-jadvalning davomi
13
0.44
0.48
0.52
0.54
0.55
0.30
0.35
0.37
0.39
0.40
14
0.42
0.47
0.50
0.52
0.53
0.29
0.33
0.35
0.37
0.38
15
0.40
0.45
0.48
0.50
0.51
0.27
0.31
0.33
0.35
0.36
16
0.38
0.43
0.46
0.48
0.49
0.26
0.30
0.32
0.34
0.35
18
0.36
0.40
0.43
0.45
0.46
0.24
0.27
0.30
0.32
0.32
20
0.34
0.37
0.40
0.42
0.43
0.22
0.26
0.28
0.29
0.29
25
0.29
0.33
0.36
0.38
0.39
0.19
0.21
0.24
0.25
0.25
30
0.25
0.28
0.31
0.33
0.34
0.16
0.18
0.21
0.22
0.22
40
0.20
0.22
0.24
0.26
0.27
0.11
0.14
0.16
0.17
0.17
U zatm a tishli gMldiraklarining geometrik oMchamlarini aniqlash
3.7-jadvalda berilgan.
3 .7-jadval
№
Tishli g ‘ildiraklarni
geometriyasi
T o ‘g ‘ri tishli
uzatmalar
A ylanasim on tishli
uzatm alar (3=35°
1
Tish b o ‘luvchi
aylanasining diametri
del= m ez
d e2 m eZ2
dei m tez
de2 m tez2
2
Tishli konus uzunligi
Re= 0.5m e
л/-
1
2 + - J
Re= 0 .5 m teA/_^ + ^
3
Tishning uzunligi
v<0.285Rc
v<0.285Rc
4
BoshlangMch
konus
burchagi
tg(p,=z,/z2= l / u
(p 2 = 9 0 °-cp i
tg
9
i= z 1/z2= l / u ф2=90°-ф!
5
0 ‘rtacha modul
m m= 0.857m e
m m= 0 .7 0 2 m te
6
Tish boMuvchi
aylanasining o ‘rtacha
diametri
dmI= m mz,=0.8
57de,
dm2= 0 .8 5 7de2
dml = ^
=
0.857rfe,
cos
p
d m 2= 0.85de2
7
Tish kallagining
balandligi
hael = ( l + x ei)m
hae2 (1-
xe2)me
h ai = ( l + X p i)m te;
ha2=(l-
xp)m te
8
Tish oyoqchaning
balandligi
h f e ,= ( l .2 -
X e l ) m e ;
hfe
2
= (l+ X el)m e
hfi=( 1.25-x^l )m te;
hf2=(l-25+Xpl)mte;
9
K onus uzunligining
o ‘rtacha
qiymati
R m = Re-0.5v
Rm = R e-0.5v
10
Tish uchi konusining
burchagi
фа1=ф1 + ^а1;
Ф а2=Ф а2+0а2
Фа1—Ф1"*~^а2?
Фа2—Ф 2"^а2
81
www.ziyouz.com kutubxonasi
K on u ssim on
u zatm alarn in g
ilash ish id a
hosil
b o ‘lad igan
kuchlar. Tishli
gMldiraklar ishlashganda um um iy kuch Fn tish
y o ‘nalishiga tik ta ’sir etadi, bu kuch esa a y lan m a Ft ham da Fr* kuchlarga
boMinadi
3.21-rasm.
F ,1 kuch tashkil etuvchilariga ajratilsa, F r - m a rk a z g a intiluvchi ham da
Fa - b o ‘y la m a hosil boMadi.
1. T o ‘g 4ri tishli konussim on gMldiraklar uchun (
3.21-rasm
) aylanm a
kuch:
Ft= 2 T 2/d 2= 2 T 2/(0 .8 5 7 d e2)
Y etaklovchi tishli gMldirakdagi
m arkazga intiluvchi kuch
(a= 20°) F,i = Fttg a-cos5i= 0.36F tl-cos5]
4 3 .2 0 )
Y etaklovchi tishli gMldirakdagi b o 'v la m a kuch
Fai=Ft-tga-sin5i=0.36Ft- sinSi
A ylanasim on tishli gMldiraklarda:
Y etaklovchi tishli gMldirak uchun radial kuch (a = 2 0 °, a=35°).
F rl= F t(0 .4 4 co s8 r 0.7>inS,)
Y etaklovchi tishli gMldirak uchun b o ‘ylam a kuch
F ai=Ft(0 .4 4 sin 8 i-0 .7 co s8 l)
Yetaklanuvchi tishli gMldirakda
Fr
2
=F al, Fa
2
=F.i boMadi.
>
(3.21)
82
www.ziyouz.com kutubxonasi
3,22-rasm .
3.17-§. K onussim on uzatm alarni egilishdagi kuchlanish b o ‘yicha
hisoblash
G ild ir a k la r d a tishning k o 'ndalang kesimi konus uchidan asosiga
tomon k o ‘ndalang kesim yuzi kattalashib boradi
(3.22-rasm).
Tek-
shirishlar shuni k o ‘rsatadiki, eguvchi kuchlanish tishning uzunligi
b o ‘ylab ham m a yerda bir xil b o i a d i . Shuning
uchun hisobni hohlagan
kesim da olib borish mumkin.
A m alda hisoblashda tishning o ‘rtasidan o l a d i g a n kesimdan
foydalaniladi.
Bunda silindrsimon uzatm alarni hisoblaganimizdek:
» ^ F i ' b s k l .
[3.22]
Bu yerda:
V F-konussim on
g ‘ildirak tishlarining mustahkamligini
silindrsimon g ‘ildirak tishlarga nisbatan kamligini hisobga oluvchi
koeffitsiyent. T o ‘g ‘ri tishli konussim on g ‘ildirak uchun Y F=0,85,
aylanasim on tishli g ‘ildirak uchun quyidagacha olish tavsiya etiladi:
N b = N 2b o 1 g a n d a YF= 0.94+0,08u
H ,> 4 5 H R C , N 2< 3 5 0 N V b o i g a n d a YF= 0,85+0,043u
N kN 2> H R C b o i g a n d a Y F= 0,65+0,1 lu
Kpv-qiymati < 3 5 0 N V b o i g a n d a -1.2; > 350N V, b o i g a n d a -1,1.
Ft= 2 T ,/d ml - aylanm a kuch; dmi=0.857de2 - o ‘rtacha diametr
у , -
Tish shaklining koeffitsiyenti, uning qiymati
g i l d i r a k
tishlarining soni Z ga nisbatan emas balki, tashqi konus yoyilmasidagi
(3.18-rcism)
aylananing ham m a jo yi tishlar bilan t o l a deb faraz
qilinganda
hosil b o l a d i g a n
ekvivalent g lld ir a k n in g tishlar soniga
nisbatan 3.7-jadvaldan olinadi yoki quyidagicha hisoblanadi:
d k = d t
