mechanicalgear

A mechanical gear is a rotating machine part having cut teeth or, in the case of a cogwheel, projections on its perimeter that mesh with another toothed part, called a gear, to transmit torque. Gears are often toothed wheels that engage one another. They are a fundamental component in mechanical engineering, used to transmit rotational motion and power between shafts.

Gears can change the speed, direction, or torque of a rotating shaft. By using gears of different sizes, the speed of rotation can be increased or decreased. A larger gear driven by a smaller gear will rotate slower but with increased torque. Conversely, a smaller gear driven by a larger gear will rotate faster with decreased torque. Gears can also be used to change the direction of rotation. When two external gears mesh, they rotate in opposite directions. Internal gears or a system involving an idler gear can achieve rotation in the same direction.

The most common type of gear is the spur gear, which has straight teeth parallel to the axis of rotation. Other common types include helical gears, bevel gears, and worm gears, each designed for specific applications and load conditions. The teeth of gears are precisely shaped to ensure smooth engagement and minimize wear. Gear systems are found in a vast array of machinery, from simple clocks and bicycles to complex industrial equipment and automobiles.