Computer Aided Analysis Of Powershifting Planetary Gearing For Construction Machinery

With the trait of power split and movable axis as well as application of inner meshed gear, Planetary Gear transmission has many advantages compared with general fixed axis gear transmission system. However, these advantages can not be realized without the balance of the load between planet gears. Therefore, it is necessary to study the load average performance of Planetary Gear transmission and the influence of load allocation between Planetary Gears.The provenance of this theme is the" Analysis of abnormal axial force and solution of BS305 planetary-gear transmission of ZL50 Wheel type loader" from Guangxi Liugong Machinery co. ltd. The aim of this research is to find out the causes of abnormal axial force that results in fracture of bolts that anchor the shaft of planet gear and rupture of gear by means of force and deformation analysis, thus propose improving project of ZL50 Wheel type loader to enhance design quality.Prime study content in the paper is described in the following.1.Each kind of averaged load unit of planetary-gear transmission is described in this paper. Equivalent error of the averaged load component of four-planet-gear transmission is analyzed for first time as well as the affection of the manufacturing error of elementary component to the displacement of the averaged load component.2.Force and deformation analysis of component of BS305 planetary-gear transmission are proposed as well as gear contact stress analysis. The factors that cause normal and abnormal axial force and their extent are proposed also.3.Three-dimensional modeling and mechanism simulation of planetary-gear transmission by means of I-DEAS software.4.Finite element analysis by means of I-DEAS software, including auto-modeling of finite element analysis model, stress and deformation analysis, contact stress analysis and post processing.5.Software designing about planetary-gear transmission. It consists of calculation of equivalent error of the averaged load component, force and deformation analysis of component, contact stress and bending strength analysis.6. The causes of abnormal axial force, which were found out by means of general analysis and finite element analysis, and the projects to eliminate abnormal axial force are provided.