The Function Of Rack And Gear
Spur gear
A spur gear is a cylindrical gear that has parallel and coplanar shafts and straight teeth parallel to the output shaft. The teeth of the spur gear have an involute profile and mesh one tooth at a time. The involute form means that the spur gear generates only radial force (no axial force), and the meshing method of the teeth will cause excessive stress on the teeth and the generation of high noise. Therefore, spur gears are usually only used for low speeds
helical gear
Helical gears are not exactly helical gears. It should be said that helical gears are the meshing method of two helical gears, which are distinguished by the different directions in which they transmit force in space. Ordinary spur gears enter into meshing along the tooth width at the same time, resulting in shock vibration noise and unstable transmission.