Gear transmission is one of the more important forms of mechanical transmission. Gears are the core components of many electromechanical products. As a special type of gears, bevel gears are mainly used to transmit the movement and power between the intersecting shafts. According to the tooth length direction curve The characteristics of spur bevel gears can be divided into straight bevel gears and curved bevel gears. The design and manufacture of straight bevel gears are relatively simple, and they are widely used.Everyone knows that spur bevel gears are tapered, and their tooth profile can be divided into big end and small end. Bevel gears take the big end parameter as the standard value.The accuracy of the calculation of the tooth thickness of the big end of the gear directly affects the pros and cons of the tooth profile machining accuracy of the straight bevel gear.