Gears are the most common means of transmitting power in mechanical engineering. There are tiny gears for devices like wrist watches and there are large gears that some of you might have noticed in the movie Titanic. Gears form vital elements of mechanisms in many machines such as vehicles, metal tooling machine tools, rolling mills, hoisting and transmitting machinery, marine engines, and the like. Toothed gears are used to change the speed, power, and direction between an input and output shaft. This site is all about Gears. Visit the pages linked below to know more about different types of gears:

Gear Technology
Spur Gear
Helical Gears
Bevel Gears
Worm Gears
Gear Design
Gear Manufacturer
Gear Lube