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Ş. l. univ. dr. ing. Jan–Cristian GRIGORE,
Universitatea din Piteşti,Catedra de Mecanică Aplicată
Organe de Ma ini ș
CURS 3
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3. Transmisii mecanice prin curele
2.1.Generalită iț
Defini ie:ț Transmisiile prin curele sunt transmisii mecanice cu element flexibil -element intermediar la care puterea se transmite prin frecare(cazul transmisieiprin curea lată i cazul transmisiei prin curea trapezoidală) i prin angrenarea nș ș
cazul transmisiilor cu curea din atăț
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Clasificarea transmisiilorprincipale
b! cu axe ncruci ateș
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3.2. Calculul geometric al transmisilor prin curea
"entru a efectua un calcul simplificat al transmisiilor prin curele, folosimipoteza n care cureaua este considerată ca un fir inextesibil nfă urat pe celeș
două ro i!ț
Această ipoteză ne permite aplicarea rela iei lui #uler pentru fire!ț
$e mai consideră că, cureaua nu are alunecare(mi care relativă n raport cuș
roata pe ung%iul de nfă urare)ș
$c%ema de calcul a unei tansmisii prin curele desc%ise cu două ro i de cureaț
este&
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3.3. Calculul cinematic al transmisilor prin curea
Cunosc'nd tura ia i diametrul ro ii conducătoare dintr-o transmisie prinț ș țcurele se poate calcula viteza periferică a curelei folosind expresia&
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For ele care solicită arboreleț
sunt:
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3.5. For ele din cupla curea roata de cureaț
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!" #U$%U#&'C"#T* AT#+#
Pit ti ti 2*15