Finite element analysis of contact characteristics of helical gears

Helical gear has the characteristics of good meshing performance, large coincidence degree and compact structure, resulting in less impact vibration noise, stable transmission and high bearing capacity. It is suitable for the situation of high speed and heavy load; Studying the load distribution on the tooth surface and the stress distribution and change at the tooth root of helical gear in a complete meshing cycle plays an important role in studying the crack and fatigue life of helical gear, and finite element analysis is one of the main methods to solve this kind of problem.

Many scholars at home and abroad have done research on the contact analysis of helical gears. Xiao Qian and others studied the influence of tooth surface friction on gear contact characteristics based on gear contact theory and gear tooth friction relationship, and found that the tooth surface stress will increase with the increase of friction coefficient. Fan Shuyang establishes the contact model of helical gear based on ANSYS software and calculates the contact stress. The simulation results are compared with the results of helical gear meshing program written in ADAMS, so as to verify the accuracy of the model. Zhu caichao and others established an accurate thermoelastic coupling contact model of helical gear based on the actual working conditions of helical gear, and studied the distribution of dynamic contact force, stiffness and temperature field of helical gear. Li Pengyang and others combined software and programming to analyze the effects of contact surface temperature distribution and friction heat on contact surface pressure distribution, surface Mises stress field and plastic strain. Patil and others studied the contact stress of helical gear under static conditions based on ANSYS software and finite element method, and considered the influence of friction factor, helix angle and other factors on the contact stress. Finally, the simulation and theoretical analysis and calculation results were compared to verify the correctness of the contact model. Zhou et al. Proposed a prediction method of helical gear friction coefficient based on reverse calculation technology according to the mapping relationship between helical gear contact surface friction coefficient and tooth root stress, combined with the numerical simulation and experimental test of bending stress.

Wang Jingyue et al. Studied the influence of tooth surface friction on helical gear transmission characteristics. LV Zhonghe and others established the contact model of helical gear based on the finite element method, studied the stress distribution of tooth root, and verified the simulation results through experiments. Pedrero et al. Proposed a non-uniform load distribution model along the contact line based on the minimum elastic potential energy criterion, and compared the helical gear bending stress and contact force calculated by the model with the elastic linear theory (Navier equation) and Hertz contact model. Chen long and others simplified the spur gear into a plane model, established the contact analysis model of helical gear, and combined with geometric analysis (isogeometric analysis,

The contact load distribution of tooth surface is studied by IGA) method. Zhou Minggang and others carried out finite element contact analysis on the meshing characteristics of spur gear transmission, and studied the effects of thermoelastic coupling and different friction factors on the contact pressure of helical gear. Jabbour et al analyzed the distribution law of contact stress of spur gear and helical gear along the contact line by considering the distribution characteristics of load along the contact line of gear. Based on ANSYS, Ding Jiejin studied the tooth deformation and contact stress change of coal mine machine gear under different working conditions.

Tang Jinyuan and others studied the contact load distribution of tooth surface based on the dynamic contact theory. Lu Fengxia proposed a new finite element mesh generation method based on the meshing characteristics of helical gears, established the tooth contact analysis model, and calculated the meshing stiffness, tooth surface deformation and tooth surface load distribution. However, at present, no scholar has systematically studied the effects of plastic deformation, tooth surface friction, contact surface temperature and linear strengthening on tooth surface contact force, but these factors have a significant impact on the analysis of contact characteristics; The finite element method is applied to the contact analysis of helical gear, considering the influence of the above factors on the tooth contact load distribution. Finally, the correctness of the simulation model is verified through the comparative analysis of experiment and simulation calculation.

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