Gears use the principle of the lever to alter speed and torque carried by rotating shafts in machines and mechanisms within machinery. Broadly, a gear is circular, with cut or inserted teeth on its circumference. The teeth mesh with the teeth of one or more other gears to transmit power and control rotational speed.


Types of Gears:
1)Spur Gear: The spur gear has a helix angle of 0°.
2)Worm Gear: Worm gears are found in right angle gearboxes. They “turn a corner.”
3)Helical Gear: This is an angle toothed gear. ...
4)Bevel Gear: Bevel gears tend to have a lower ratio and run at a higher efficiency than worm gears.


Gears are used to transfer motion and torque between machine components in mechanical devices. Depending on the design and construction of the gear pair employed, gears can change the direction of movement and/or increase the output speed or torque.


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