Study Of The Roller Hollowness To The Bearing Capacity Of Three-row Roller Slewing Bearing

With the rapid development of national economy, the excavators and cranes become more and more large-scale. As the main part of bearing the load, the carrying capacity of slewing rings is required higher and higher. At the present, some scholars have researched all-purpose bearings and the research level is relatively mature. However, more in-depth study should be put on three-row roller slewing rings. Therefore, it’s necessary to research contact characteristics to improve its working life.In this article, the author analysis the roller-raceway contact characteristics of three-row roller slewing bearing used in excavators combined with its specific use conditions. Mainly include the followings:Combined with its structural features and operating characteristics, this paper calculate and analysis the structural features and operating characteristics of the combination of excavators calculate and analyze the load characteristics by transforming the overturning moment load into the axial equivalent load and calculate the location of the maximum load roller.The author analysis contact stress and deformation with Hertz contact theory, and calculate contact stress and deformation of the contact area. Then the numerical simulation is used on roller-raceway contact characteristics with ANSYS finite element analysis software. The maximum contact stress and maximum equivalent stress of the roller are both at ends, and the middle part of the roller contact stress and stress distribution is relatively uniform. Stress concentration happens at the end of the roller.Hollow roller stress and deformation are analysised with Castiglione theory and the paper gets stress distribution of the special points of the hollow roller. And the contact stress effects force and radial displacement along the axial and radial distribution law are obtained after FEM analysis.The trend of initial contact online contact stress, stress and radial the displacement of the different hollow rollers are researched in this paper. Based on curve fitting theory, different hollow rollers of hollowness are researched and optimized. The edge of the contact stress concentration optimized rollers is significantly reduced and stress is more evenly distributed along the roller axis to help improve the life of the slewing ring.