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A crank fan uses a spur gear system to spin the blades around and make a breeze. The faster the fan turns, the stronger the
breeze. Using a big gear to turn a small gear makes it very easy to turn the blades quickly. For one full turn of the big gear,
the small gear spins around many times. How many times it spins depends on the number of teeth both gears have (gear
ratio). The spur gears turn the blades much faster than if you turned the blades directly with a crank.
Un ventilateur à manivelle utilise un système d’engrenages à roues droites pour faire tourner les pales et créer un courant
d’air. Plus le ventilateur tourne vite, plus le courant d’air est fort. Si l’on utilise un grand engrenage pour faire tourner un
petit engrenage, il est très facile de faire tourner rapidement les pales. A chaque fois que le grand engrenage fait un tour
complet, le petit engrenage fait de nombreux tours complets. Le nombre de tours dépend du nombre de dents de chacun
des deux engrenages. Les engrenages à roues droites font tourner les pales beaucoup plus vite que si vous les faisiez
tourner directement avec une manivelle.
(EN) What happens when the big gear drives the small gear?
(FR) Quels changements quand le grand matériel conduit le petit matériel ?
(DE) Was passiert, wenn das große Zahnrad das kleine Zahnrad antreibt?
(NL) Wat gebeurt er als de grote versnelling drijft het kleine tandwiel?
(EN) What happens when the small gear drives the big gear?
(FR) Quels changements quand le petit matériel conduit le grand matériel ?
(DE) Was passiert, wenn das kleine Zahnrad das große Zahnrad antreibt?
(NL) Wat gebeurt er als de kleine versnelling drijft het grote tandwiel?
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