Transfer power, change the speed and direction of movement
Gears are toothed mechanical parts that can mesh with each other, and the application of gears in transmission has appeared very early. The role of gears mainly has the following three points.

Power transmission: gears can transmit mechanical power, such as gear shifting devices of automobiles and industrial gearboxes.
Change the speed and direction of movement: gears can change the direction of movement, such as mechanical watches, shaking heads in electric fans, etc. Gears can reduce the speed and improve the torque, such as motor reducers and various transmission mechanisms.
Gear transmission: Gear transmission is the most widely used transmission form in mechanical transmission. It has the advantages of accurate transmission, high efficiency, compact structure, reliable operation and long service life.