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TRANSMISSION DE MOUVEMENT PAR ENGRENAGE

RAPPEL 

Qu'avons nous étudié la fois passée?

MOTIVATION

De quoi est composée une boîte de vitesse d'une automobile,

ANNONCE DU SUJET

Aujourd'hui, nous allons étudié 

RAPPEL

La fois passée, nous avons étudié la transmission de mouvement par roues de friction
MOTIVATION

Une boîte de vitesse d'un automobile est composée des engrenages.

ANNONCE DU SUJET

Transmission par engrenage.

Quel est le but de cette transmission?

III. 5.  TRANSMISSION PAR ENGRENAGE

III.5.1. BUT: les mécanismes dentés sont destinés à transmettre un mouvement de rotation avec un rapport de vitesse rigoureux entre deux arbres rapprochés. 

Un "train d'engrenage" comporte deux roues dentées: la grande appelée roue et la petite appelée pignon. 

III.5.2. Classification des engrenages

 les types des engrenages sont fonction de la position des arbres sur lesquels ils sont calés. 

a) Arbre parallèle

Engrenages cylindriques à dentures droite, hélicoïdale, ou à chevrons. 

Les engrenages peuvent être intérieurs ou extérieurs. Si un des rayons devient infini on obtient la crémaillère.

b) Arbres concourantes

Engrenages coniques à denture droite, hélicoïdale ou spiraloïdale.

c) Arbres orthogonaux

Si le rapport de transmission est grand:

  • le système roue tangentielle, vix sans fin

Si le rapport de transmission est normal

  • engrenages cylindriques hélicoïdaux,
  •          "           coniques hypoïdaux 

d) Arbres quelconques

 

  • engrenages cylindriques hélicoïdaux,
  •          "           coniques hypoïdaux 

Remarques: nous étudierons  dans ce traité que les engrenages les plus courants; cylindriques droits et hélicoïdaux, et coniques droits (vis sans fin et roue tangentielle déjà vus).

Qu'avons étudié aujourd'hui?  

Aujourd'hui, nous avons étudié la transmission de mouvement par engrenage.  

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