kotrljajni leŽaji - omk.mas.bg.ac.rsomk.mas.bg.ac.rs/files/elementi1/smena3/me1/kotrljajni...
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KOTRLJAJNI LEŽAJI
Ležaji su mašinski elementi čija se osnovna funkcija sastoji u obezbeđivanju uslova za relativno kretanje obrtnih delova i za prenošenje opterećenja između njih.
Prema pravcu sile koju prenose ležaji mogu biti:- radijalni,-radi-aksijalni,- aksijalni,
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Osnovni delovi ležaja:- kotrljajna tela,- prstenovi/koluti,- kavez.
KOTRLJAJNA TELA:- kuglice,- valjci,- iglice,- konusni valjci, - bačvice,-konusne bačvice,
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TOLERANCIJE I NALEGANJE KOD LEŽAJA
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Radijalni ležaji
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Podesivi sa jednim i dva reda bačvica
Valjčasti ležaji
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RADIAKSIJALNILEŽAJI
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Aksijalni ležaji
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Čvrstoća, nosivost i radni vek ležaja
zFkF
bEFp o
o ⋅=⋅⋅
⋅= 0max ;418.0ρ
a) Opterećenje i naponi u delovima ležaja
bzFk o
N ⋅⋅⋅
⋅=ρ
σ 0418.0
NN mNc
mNc ⋅=⋅ σσ
m
N
m
Nc
bzEFk
bzEFk
⎟⎟⎠
⎞⎜⎜⎝
⎛
⋅⋅⋅⋅
⋅=⎟⎟⎠
⎞⎜⎜⎝
⎛
⋅⋅⋅⋅
⋅ρρ
00 418.0418.0
c
m
Nc
m
Nc NFNF ⋅=⋅ 22
( )
( )ksks
kuku
ρρρρρ
ρρρρρ
_/ :prstenu spoljnom na
/ :prstenu munutrašnje na
⋅=−
+⋅=−
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Dinamička nosivost ležaja C je opterećenje – sila koji ležaj može da prenosi u toku Nc = obrtaja (promena opterećenja) s tim da se pri tome ne razori više od 10% od ispitivanog skupa ležaja.
Radni vek ležajahh LnNLnN ⋅⋅=⋅⋅= 60 ili 3600
ααα ⎟
⎠⎞
⎜⎝⎛⋅=⋅=⋅
FCNNNFNC CC odnosno
αα
⎟⎠⎞
⎜⎝⎛⋅
⋅=⎟
⎠⎞
⎜⎝⎛⋅
⋅=
FC
nL
FC
nL hh 60
10 odnosno 3600
10 66
α
⎟⎠⎞
⎜⎝⎛ ⋅⋅⋅
⋅⋅⋅⋅=
FCkk
naaaL c
h9
6
321 6010
Dinamička nosivost
610
1a− - Uticaj rasipanja podataka o nosivosti ležaja- Uticaj vrste materijala delova ležaja2a−- Uticaj uslova podmazivanja3a−
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Statička nosivost je opterećenje koje dovodi do trajnih deformacija koje nisu veće od prečnika kotrljajnog tela:
Statička nosivost 0C
( ) .10 4ks df −≤
-410
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Ekvivalentno opterećenje ležaja
arar FYFXFFYFXF ⋅+⋅=⋅+⋅= 000 odnosno
FYFXF r ⋅+⋅⋅= 2,1
22yxr FFF +=
α
αααα
k
kk
nnnnnFnFnFnFF
ΣΣΣΣ
ΣΣΣΣ
++++⋅++⋅+⋅+⋅
=...
...
321
332211
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Smernice za ugradnju ležaja
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Zaptivanje ležaja
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