A gear is a mechanical element with teeth on the flange that can continuously mesh and transmit motion and power. Gear is the mechanical parts that can mesh with each other. The application of gears in transmission has appeared very early. At the end of the nineteenth Century, the principle of expanding the cutting method and the special machine tools and cutting tools used in the cutting of the teeth were presented one after another. With the development of production, the stability of gear operation has been paid attention to.
Spur gears are commonly known as spur gears, which are relative to helical gears.
Spur gear is a standard spur gear used in gear drive. Its root height is equal to 1.25 modulus, the addendum is equal to 1 modulus
