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Unit-3

Lecture 8

Flexible coupling

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https://www.youtube.com/watch?v=1_biBovv_RM 

https://www.youtube.com/watch?v=1_biBovv_RMhttps://www.youtube.com/watch?v=1_biBovv_RMhttps://www.youtube.com/watch?v=1_biBovv_RMhttps://www.youtube.com/watch?v=1_biBovv_RMhttps://www.youtube.com/watch?v=1_biBovv_RMhttps://www.youtube.com/watch?v=1_biBovv_RM

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The value of maximumprincipal stress varies from28 to 42 MPa

e now that ben!in" st#ess$

%imum ben!in" moment on the pin$

&i#ect shea# st#ess !ue to pu#e to#sionin the coup'in" ha'ves$

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&esi"n a bushe!-pin type o( )e%ib'e coup'in" to connect a pump sha(t to amoto# sha(t t#ansmittin" 3* W at +, #.p.m. he ove#a'' to#ue is * pe#centmo#e than mean to#ue. he mate#ia' p#ope#ties a#e as (o''ows : 0a hea''owab'e shea# an! c#ushin" st#ess (o# sha(t an! ey mate#ia' is 2 Ma an!4 Ma #espective'y. 0b he a''owab'e shea# st#ess (o# cast i#on is 15 Ma. 0c

 he a''owab'e bea#in" p#essu#e (o# #ubbe# bush is .4 6/mm*

. 0! hemate#ia' o( the pin is same as that o( sha(t an! ey. aw neat setch o( thecoup'in"7iven : = 3* W = 3* 8 13 W 9 6 = +, #.p.m. 9 ma% = 1.* mean s =  = 2 Mpa = 2 6/mm

* 9 ;cs 

= ;c = 4 Ma = 4 6/mm* 9 c = 15 Ma = 15

6/mm* 9 pb = .4 6/mm*

sign for pins and rubber bush

We have !iscusse! in #i"i! type o( )an"ecoup'in" that the numbe# o( bo'ts (o# 2 mm!iamete# sha(t a#e 3. b#ass bushca##ies a #ubbe# bush. >ssume the thicness o(

' = en"th o( the bush in the )an"e.We now that the bea#in" 'oa! actin" on eachpin$

W = pb 8 !* 8 ' = .4 8 2 8 ' = 3* ' 6

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@ince the ma%imum p#incipa'st#ess an! ma%imum shea# st#ess a#ewithin 'imits$ the#e(o#e the !esi"n is

sa(e.