From a manufacturing perspective, gears can be divided into two parts: the gear ring and the gear body. Based on the tooth distribution on the gear ring, they can be classified as spur gears, helical gears, herringbone gears, etc. According to the structural characteristics of the gear body, gears are broadly classified as disc gears, gear sets, shaft gears, sector gears, and racks, etc. Among these, disc gears are the most widely used.
