Research On The Design Method And System Of Planetary Gear Transmission

The advantages of planetary gear transmission include high efficiency,a compact structure,a large gear ratio,and a large power weight ratio,making it widely used in various transmission systems.The planetary gear is composed of a solar gear(including internal and external gear),planetary gears,and a planetary frame.Various planet ary gear mechanisms are derived from the combination of different types of changes,making the design of a planetary gear device a complex and difficult task.Therefore,based on the structural characteristics of the planetary gear transmission,the design and optimization of the planetary gear transmission are systematically studied.The main research contents are as follows:(1)A design method of the planetary gear rotation device has been presented,based on hierarchical structure design and rocket type.The planetary gear transmission has been divided into modular processing according to its structural characteristics.The parameters and constraints of each module have been associated using the method of parameter model library and feature design.Finally,by combining with the rocket launch principle,the assembly constraints between the multistage planetary gear stages have been optimized.This has enabled the rapid design of the planetary gear transmission structure,improving the design quality and efficiency of the multistage planetary gear.(2)A gear shape modification method based on space lattice has been proposed.Gear modification has been an important technology for improving the meshing state and transmission accuracy of planetary gears.In this paper,the tooth surface has been discreted into a regular space lattice,and the modification amount has been mapped to the corresponding space points.Then,the quadratic B-spline mesh curve has been generated to construct a smooth tooth profile surface.Adaptive mapping has been applied to all tooth surfaces.By controlling the position and amount of modification,precise modification of the tooth surface has been achieved,obtaining high-quality tooth profile surfaces that meet the requirements of gear modification.(3)The concept of progressive optimization of planetary shelf type and structure size has been proposed.Firstly,force analysis of the planetary shelf has been conducted,and the best type of the planetary shelf has been determined by considering the processing technology and the characteristics of the space structure.Then,through finite element analysis and the optimization design method,the planetary frame structure has been idealized and processed as a model.Subsequently,the structure size has been optimized and adjusted to meet the strength requirements and safety requirements of the minimum asteroid frame structure size.This has aimed to increase the application range of planetary gears and reduce production costs.(4)A planetary gear transmission design system has been developed by seamlessly integrating the proposed design methods,utilizing the modeling and simulation module of NX software.The system has been verified through analysis and design of modularity and in combination with a design example.This verification has assessed the operation performance and executable efficiency of the algorithm and the system,demonstrating that the system has good interaction and applicability.