Gear is a mechanical part with teeth on the rim that can continuously engage to transmit motion and power, and the gear relies on the mesh of teeth to transmit torque. The gear is driven by other toothed mechanical parts (such as another gear, rack, worm), and the transmission mode is meshing transmission, which can change the speed and torque, change the direction of movement and change the form of movement. Due to the advantages of high transmission efficiency, accurate transmission ratio and large power range, gear mechanism is widely used in industrial products, and its design and manufacturing level will directly affect the quality of industrial products….