In order to study the temperature distribution characteristics of the planetary gear transmission system, a numerical analysis method of the dynamic temperature field of the planetary gear transmission system is proposed based on the theory of friction heat generation and heat transfer of the tooth surface, combining the dynamic characteristics of the planetary gear transmission system and comprehensively considering the influence of bearing gear friction heat generation and system heat transfer. The analysis method is mainly composed of three parts:
The first part is to solve the dynamic load of the system based on the lumped mass method. In this part, the coupling relationship between various components of the system is considered, the dynamic model of the planetary gear system is established, and the dynamic load of the planetary gear and bearing is extracted, which provides a data basis for the subsequent calculation of the contact pressure, friction coefficient and bearing friction torque of the meshing tooth surface.
The second part is to establish a numerical analysis model for the thermal parameters of the dynamic temperature field of the system based on the principles of heat transfer and fluid mechanics. This part analyzes and calculates the heat source of the system, calculates the heat flow density of planetary gears and bearings by analyzing the contact pressure of the tooth surface when engaging, the relative sliding speed, the friction coefficient and other parameters, and determines the heat transfer coefficient and convection heat transfer coefficient of each component of the system through the theory of heat transfer, It will be used as the thermal load and boundary condition for the subsequent system dynamic temperature field simulation analysis.
The third part is the system dynamic temperature field analysis and experimental verification. The analysis model is modified through the experimental test results to improve the practicability of the analysis method. On this basis, the temperature distribution law and heat transfer path are studied. As a branch of dynamic characteristics, the dynamic temperature field can be obtained by analyzing the influence of working condition changes on the dynamic load of the system and bringing it into the numerical analysis model for simulation calculation.