R. X. Maksudov
K onussim on tishli g ild ir a k la r n in g geom etrik o ic h a m la r i
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R. X. Maksudov
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- 0.857rfe, cos p
- Фа1—Ф1"*^а2 Фа2—Ф 2"^а2 81 K on u ssim on u zatm alarn in g
- 3,22-rasm . 3.17-§. K onussim on uzatm alarni egilishdagi kuchlanish b o ‘yicha hisoblash
K onussim on tishli g ild ir a k la r n in g geom etrik o ic h a m la r i. Uzatm a
gildirak larin in g geometrik o ich a m la rin i aniqlashda hisobiy modul sifatida tishning sirtqi tomonidan (keng) aniqlangan modul ishlatiladi, bunda to ‘g ‘ri tishli g ild ira k la r uchun me, aylanasimon tishli g ild ira k la rd a m te. Q u v v at uzatadigan uzatm alarda me >15 mm olinadi. Tishlar soni z i = l 8-35 gacha olish ta vsiya etiladi. Forma 11 Forma III a) b) d) 3 .20-rasm . K onussim on u zam a g i l d i r a k tishlarning yem irilishga chidam - liligini oshirish m aqsadida balandlik korreksiyasi ishlatiladi. B unda g i l d i r a k tishlarning qattiqligi o i'ta s id a g i farq нвт - нвур x K , x ex qiymatlari 3.6-jadvaldan tanlanadi. 3.6 - ja d v a l г, U zatis h s o n i u b o i g a n d a X, k o e ff its iy e n t q iy m a tl a r i U z a tis h so ni u b o i g a n d a л„ k o e f f its iv e n t qiv n iatlari 2.0 2.5 3.15 4.0 5.0 2.0 2.5 3.15 4.0 5.0 12 - 0 .50 0.53 0 .5 6 0 .57 0.32 0.37 0 .39 0.41 0.42 80 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 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 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 /c o s St . Zk Download 5.58 Mb. Do'stlaringiz bilan baham: |
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