PDF- -1 CIRCUITE ELECTRICE LINIARE - automationucvro - calculul unui arbore

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Cuprins 1

Brevieri de calcul…………………………………………

Schema de incarcare………………………………………

Calculul diametrelor arborelui in sectiunile caracteristice

4) Umarul

Calculul rulmentilor

Calcului penelor…………………………………………………

Concluzii………………………………………………………

Brevieri de calcul 1

Acest otel necesita tratament de normalizare

Caracteristicile de rezistenta ale materialului sunt urmatoarele:  Tensiunea admisibila la incovoiere: (σai)III = 52 [MPa]  Tensiunea admisibila la rasucire :(τar)II = 38 [MPa]  Se aplica un coeficient de corectie :

Moment de rasucire: (

Forta orizontala: ⁄ Forta verticala:

Distanta dintre reazeme:

Distanta: ⁄ Turatia motorului:

Schema de incarcare Stabilirea schemei de incarcare,

adoptarea formei constructive al arborelui,

calculul reactiunilor din reazeme si trasarea diagramei de moment

Verificare :

Calculul diametrelor arborelui in sectiunile caracteristice 3

Din STAS 8724/271 alegem:  Diametrul capatului de arbore:  Lungimea capatului de arbore :

predimensionarea se face prin intermediul unui moment echivalent la inconvoiere (Mei)B

Din STAS :  Diametrul fusului B:  Lungimea fusului B:

Alegem preliminar rulmentul cu seria 6311 cu caracteristicile :  Diametrul interior : 55[mm]  Diametrul exterior : 120[mm]  Lungimea :   

Este supusa unor solicitari compuse (incovoiere + rasucire),

prin urmare calculul de predimensionare se va face prin intermediul momentului echivalent la incovoiere:

Din STAS se alege :  Diametrul suprafetei C: (  Lungimea supraf

Lungimea umarului:

Calculul rulmentilor Vom calcula rulmentii din conditia de rezistenta la uzura de oboseala (de tip Pitting)

Calculul penelor 5

am ales din STAS o pana cu caracteristicile :  Inaltimea penei : h=10[mm]  Latimea penei : b=16[mm]

Alegem din STAS,

Verificarea la forferare a penei:

Diametrul adoptat pentru suprafata pe care se va monta roata dintata este ,

deci in conformitate cu STAS 1004-81 am ales o pana cu urmatoarele caracteristici :  Inaltimea penei : h=11[mm]  Latimea penei : b=18 [mm]

Din STAS alegem :

Verificarea la forfecare a penei:

Concluzii: Am dimensionat un arbore drept ,

confectionat din otel marca OL50 supus la solicitarile de incovoiere si rasucire

Diametrele si lungimile sectiunilor caracteristice :         

Diametrul capatului de arbore : Lungimea capatului de arbore : Diametrul fusului B : Lungimea fusului B : Rulment seria 6311 Lungimea umarului : Diametrul suprafetei C : Lungimea suprafetei C : Pana capat arbore : o Inaltimea penei : h=10[mm] o Latimea penei : b=16[mm] o Lungimea penei :  Pana roata dintata : o Inaltimea penei : h=11[mm] o Latimea penei : b=18[mm] o Lungimea penei :

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