The gear (gear, sprocket) is basically a wheel with teeth completely covered perimeter. The most common type of gear has straight teeth (longitudinal) but also the teeth are curved, oblique ...
For proper operation, the operator often turn solidarity with its axis, so that both are linked by a detachable joint use another operator named key.
Particular cases of the sprockets are the screw and the rack.
Utility:
This operator can be used for two basic functions:
1.-transmit rotary motion between two shafts with the idea of \u200b\u200bchanging its direction of rotation, speed or direction, either directly coupled together several gears (gear, flashlight, gear train, worm-pinion) or using an articulated chain (chain-sprocket mechanism) .
During the Middle Ages were used gear mechanisms-lantern that were in common use in all hydraulic devices of the era (mills, decks ...).
allows parallel or cross-axis coupling to 90 ยบ.
gear system is widely used in automobile (gearbox), machine tools (drills, lathes, milling ...), watch ... and gearbox, allowing parallel shaft coupling or intersect at any angle.
The worm-gear reducers used in electric motor speed, is also used in high-precision components (micrometer screws).
This system is not reversible (the driving shaft must always be attached to the worm) and has the advantage of providing a large reduction in highest speed in the smallest space. It only allows coupling axis 90 °.
chain-sprocket system can see it on bicycle Bikes, automatic sliding doors (elevators, supermarkets, airports ...), inner workings of engines ... but only allows coupling shafts are parallel.
2.-Transform
swirling in alternative (or vice versa), using mechanisms that combine the sprocket with the rack (rack-pinion system) This assembly is used on locks, playground equipment, microscopes, drills sensitive, corkscrews, outboard engines ...
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