R. X. Maksudov
r: = 439Им , yetaklanuchi valning aylanish soni; п2 = Ю0мин~\
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R. X. Maksudov
r: = 439Им
, yetaklanuchi valning aylanish soni; п2 = Ю0мин~\ uzatish soni; и = 2.8, ishlash muddati; L„ = 1 0 0 0 0 c . M a sa la n in g yechim i: 1. U zatm a tishli gMldiraklari uchun material tanlanadi. Material sifatida yetaklovchi va yetaklanuvchi tishli gMldiraklar uchun 45xn markali poMat material tanlab. term ik qayta ishlanish yaxshilanish va yu.ch.t. yo rd am id a toblashni tanlaymiz. B u n d a tish yuzasining qattiqligi (45-56) HRC. 2. Ruxsat etilgan [ ] kuchlanishlar qiymati yetaklovchi va yetaklanuvchi tishli gMldiraklar uchun alohida-alohida aniqlanadi. a) Yetaklanuvchi tishli gMldirak uchun [<тД .- k , ] 2 = K hL 2 - к „ \М П а- [ c t J = \4 H R C „ + 1 7 0 М П а , 86 b u n d a : [ег„„ } = 14 HRC ,p + 170 = 14 ■ 48 + 170 = ШМПа. b u n d a : n ho = [ h b J ' = (495)'' = 121-ioV,. N 2 = 5751V, Lh = 573 -10.46 -10000 = 60 • 10r цикл , i 9 1 1 л N a t i j a d a , к шг = «1 ^ ~ = 1.12 < s h a r t b a j a r i l d i . F o r m u l a g a [ a j , h a m d a a : ,,, q i y m a t l a r n i q o ‘y i b , q u y i d a g i i f o d a n i o l a m m i z . [erj2 = 1.12 -828 = 921 МПа b ) Y e t a k l o v c h i ti s h l i g i l d i r a k u c h u n К ): = Kmi \<*ЛМПа b u n d a : [e r j, = k J : = 921 Mila q i l i n a d i . K HaX,[aHa\ - q i y m a t l a r n i f o r m u l a g a q o ‘y i b , q u y i d a g i i f o d a n i o l a m i z . [<7 ], = 1,0-828 = Ш М П а \ ) Y e t a k l a n u v c h i t i s h l i g i l d i r a k u c h u n [a-,,], к I = K ru - k . J МПа IJV b u n d a : K,.n = -1 -63; л-,,. = 4 • \о(' ц и м , л\ = 60 ■ ю "цикл , /v, > ,\ш b o l g a n l i g i u c h u n A'//2 = 1.0.[а-.а] = 310Л/Яа. N a t i j a d a , [егД =1.0-310 = МПа g ) Y e t a k l o v c h i ti sh li g i l d i r a k u c h u n [a,. ],. b u n d a : N H O = 121 10 "цикл. Л;, - , \ , -и, = 60-10" -2.8 = 168-101,1/шс7. n a t i j a d a , к Ш Л = V 168~ 10 b o i g a n d a к шл = 1,0 q a b u l к \ = К и Г [ст1г,}МПа B u n d a : a: = . , E * l = « / _ i i l i _ = i . o ; [<7 ] = зюл//7а. V Л’’. \ 168-Ю0 /о N a t i j a d a , [стг \ = i.o - з ю = ш м п а 87 3) O ‘q lararo m asofa. , ч I К „ • Г, -10 a w = K a { 1 + ----- f - — — м м Wa ч b u n d a : K a = 43T, = 439 H m , u = 2.8 \ o H ]2 = Ш М П а ; K Hg = 1 + < 2.0 ; 5 V * = 0 .5 ^ ■ (m + 1)= 0.5• 0.315(2.5 + 1) = 0.55; iffa = 0.315 , л = 8.0 . N a t i j a d a , k h0 = 1 + 2 0,55 = 1,15 8 A n i q l a n g a n , t a n l a n g a n q i y m a t l a r n i f o r m u l a g a q o ‘y i b , q u y i d a g i i f o d a n i o l a m i z : O o J 1-15 439-103 ino = 43(1 + 2.8Ы -----------— ——------— = 108лш \ 0.315 -(2.8)- • (828) A n i q l a n g a n q i y m a t n i y a x l i t l a b я н. =П 2 л ш q a b u l q i l a m i z . 4) Y eta k la n u v ch i tishli g ‘ild ira k b o ‘luvchi a y la n a sin in g oMchami. , 2 a„u 2 -112 2.8 1/CCA = 7 ——-r = ---------r— = 165,0лш (ы + l) (2.8 + 1) 5) Y etak lan u vch i tish li gM ldirak eni. в, =i )/a -a = 0,315-112 = 35,28лш. A n i q l a n g a n q i y m a t y a x l i t l a b в2 =35лш q a b u l q i l a m i z . 6) Y etak lovch i tishli gM ldirak eni. в, = 1,12 e2 = 1 , 12-35 = 39, 27 m m . A n i q l a n g a n q i y m a t y a x l i t l a b e , = 4 0 мм q a b u l q i l a m i z . 7) Ilashish m oduli. 2 К. -Г, -103 W > — -------7--- i м м , d 2 ■ e 2 • К j b u n d a : AT,,, =5.8,r 2 = 439Нм,d 3 =165.0лш,в, =32лш,[ст; ] = 310M7a. 2-^ 8- 439 • 10s N a t i j a d a : m = — - --------------= з,Плш. A n i q l a n g a n q i y m a t y a x l i t l a n i b 165,0-32-310 ^ ' //г = 3,0 numv q a b u l q i l a m i z . m a F v o a F v o o M M 8. G ‘ild irak tish larin in g q iyalik b u rch agi ham da uzatm a g ‘ild irak - larin in g tishlar soni. a) Q i y a l i k b u r c h a g i . P = arcsin = arcsin - — = 20"3‘ e, 35 b ) U z a t m a t i s h l a r s o n i n g u m u m i y q i y m a t i . 88 z _ 2 a M , cosflmn 2 112 0.9394 _ 7Q Q m 3.0 v ) Q i y a l i k b u r c h a g i n i n g h i s o b i y q i y m a t i . ( 2 т -г,Л f 70-3.0^ 0 , В = агссоя —------ = агссо я ---------- = 20 22 \ 2 a v J \ 2-112; 9. Y ctak lovch i va yetak lan u vch i g ‘ild irak tishlar soni. 70 r, = —^Ц- = ———г = 18.4 = 18.0 (ы + l) (2.8+1) r 2 = r z - г , = 7 0 - 1 8 = 52 10. U zatish sonini hisobiy qiym ati. ux = ^ = — = 2.88 и = ■ 100 = 2 8 ~ 2 8 8 . loo = 2 . 8 % < [4%1 s h a r t b a i a r i l a d i . r, 18 и 2.8 11. T ishli g ‘ild irak larn in g geom etrik o ‘lcham lari. a ) T i s h b o i u v c h i a y l a n a s i n i n g o i c h a m i mz, 3.0 18 cos Д 0.9375 = 57 6 m m , m z, 3.0-52 d , ~ ------— = --------- = 166.4лш. - cos/?, 0.9375 rf.+rf, 57,6 + 166.4 a = —1------ = -------------- = 11 2 мм. 2 2 b) Tashqi aylanasining oMchami. d ai = d t + 2 m = 57.6 + 2 -3 .0 = 63.4лш, d a, = d. + 2m = 166.4 + 2 -3.0 = 172.4лш, v) Tish osti aylanasining o i c h a m i . d n = d t - 2 . 5 m = 5 7 ,6 - 2 ,5 - 3 = 50. \ mm d f 2 = d 2 -2.5#w = 1 6 6 .4 - 2 ,5 -3 = 158.9.ш< 12. E guvchi kuchlanishni hisobiy qiym ati. a) Yetaklanuvchi tishli g ‘ildirak uchun. Ya ' К , ■ К F ■ K r ) ■ Yr , - F a , 2 = S - ----- -- ------------—— - МПа в2 ■ m b u n d a : r = ^ = 3.14.166.4.100s 0 8 7 „ /e 60000 60000 Yopiq uzatm a uchun 7-klass aniqlik darajasini belgilaymiz, jadvaldan к ы/ = 0 .8 1 tish yuzasining qattiqligi > 350 b o ‘lganligi uchun KFv = i.i; Kr/i = l + <1.7. Uzatm aning tezligi г <15 м / с boMganda n on0 7 S? K r/j = 1.0;г = 1 — ~ = 1 - — — = 1 . 1 З; z , K = - Ц - = = 63 boMganda }’ = 3 .6 2 140 140 c o s’ /? 0.824 b ri 2Г, 7 -439 • 101 F = — - = = 5276Я , d , 1664 89 A n i q l a n g a n v a t a n l a n g a n q i y m a t l a r n i y u q o r i d a g i f o r m u l a g a q o ‘y i b , q u y i d a g i i f o d a n i o l a m i z . cr = 0 8 1 1 1 1 0 1 1 3 3 -6.? - ^2 7 - = 2 0 2 .2 МПа < [ s h a r t b a j a r i l a d i . 3 5 -3 .0 2 b) Y e t a k l o v c h i t i s h l i g ‘ i l d i r a k u c h u n . °>! = cTf2 — = 202 = 185Л-/Яа < [o> ], s h a r t b a j a r i l a d i . Yn 3.95 B u n d a : z„. = = 23 b o ‘l g a n d a Yn = 3 .9 5 . cos’ p (0.9375) 13. K o n t a k t k u c h l a n i s h n i n g h i s o b i y q i y m a t i . о = 3 7 6 IК . ■ К - F^ U + l \ \-ma V ................. " B u n d a : K Ha = l.i; G ' i l d i r a k t i s h l a r i n i n g q a t t i q l i g i > 350 h b b o ‘ l g a n d a = *■*; = 1,15; F, = 5 2 7 6 # ; = 166.4лш; в: =35л<; Q i y m a t l a r n i f o r m u l a g a q o ‘y i b , q u y i d a g i i f o d a n i o l a m i z . a = 376 , I S : M ' j?1 5 ’52 7 6 : (3 ° ± 5 = ш м п а < \u ] s h a r t b a j a r i l d i . V 166.4-35 90 I V bob. C H E R V Y A K L I U Z A T M A L A R 4.1 -§. U m u m iy m a ’lum otlar Chervyakli uzatm alar bu kinematik ju ft chervyakli g ‘ildiraklardan iborat, o ‘qlari esa joylashgan, 4.1-rasm. Ayqash burchakning qiymati har xil boMishi mumkin, biroq amalda, u asosan 9 0 '1. Chervyakli uzatm aning ishlash printsipi vintli juftni ishlashiga o 'x sh a sh b o ‘ladi. A fzalliklari: bir p o g ‘onali uzatm ada uzatish soni kinematik uzatm alar uchun u=500 gacha, quvvat uzatadigan uzatmalarda; u=8-80 gacha [. boMib eng katta qiymati 120 gacha 4 ,i-r a sm . b o ‘lishi mumkin; ravon va shovqinsiz ishlaydi; 0 'z - o ‘zidan to'x tay d ig an qilib tayyorlash m umkin (bunday uzatm alarda f.i.k 50% dan kam). K a m c h iiik la r i: f.i.k. nisbatan kichik (г|=0.7-Ю.92); uzatiladigan quvvatning qiymati chegaralangan -50-5-60 kVt; uzatm a to'xtovsiz ishlaganda qizib ketishi; rangli materiallarni ishlatilishi. Lekin shu yuqorida k o ‘rsatilgan kamchilikiardan q a t’iy nazar bu uzatm alar xalq x o ‘jaligida k o ‘p ishlatiladi. Chervyakli uzatmalarning uzatish soni qiymatini quyidagicha aniqlash mumkin: bunda: 15>7>7> Download 5.58 Mb. Do'stlaringiz bilan baham: |
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