In the 20th century, gear transmission has been widely used in industry, national defense, agriculture and other fields because of its constant transmission ratio, stable operation, large range of transmission speed and power and many other characteristics. With the emergence of involute gear,, , worm and quasi double-sided gear, the transmission characteristics of gears have attracted great attention. In the 1970s, the finite element method has been applied to the analysis of automobile structure abroad.
With the development of science and technology, the continuous improvement of computer hardware and software and the improvement of finite element analysis methods, many kinds of finite element software products have appeared in the world. At the same time, the finite element analysis of helical gear is also developing rapidly. The key points of foreign helical gear finite element analysis are: contact stress of helical gear, bending stress of tooth root, temperature field analysis and modal analysis of helical gear. Corneal summarized the deformation of gear teeth and considered the deformation caused by bending, Hertz contact, shear and the elasticity of helical gear body. Tsuta analyzed the influence of the stiffness of helical gear shaft and bearing on the dynamic performance of helical gear transmission.