In essence, gears are just circles with tooth connecting them. A equipment transmits a circular movement involving two various shafts by rotating and meshing with another equipment on the other shaft. Gears appear in many different shapes and sizes, such as spur gear, helical gear, bevel gear, and worm gear. https://spencerzffed.blogacep.com/39406544/automobile-gearbox-things-to-know-before-you-buy