Dynamic Performance Analysis And Optimization Design For Tapered Roller Bearing

With the rapid development of high-end equipments in rail transport, high-end CNC machine tools, aerospace and other fields, the working conditions of rolling bearing become more and more severe and bearing performances are more sensitive to the bearing structure parameters, working conditions and environment,which make higher requirements for the rolling bearing performances. The failure forms caused by rolling bearing dynamic performances are toward diversification trend. Especially, the premature failure of the rolling bearing caused by poor dynamic performances greatly shortens the service life of equipment. Therefore, it is necessary to study the dynamic performances of the rolling bearing. The research target of this paper is the dynamic performance for tapered roller bearing. The dynamic simulation model is constructed by combining the bearing analysis theory and simulation technology. Based on the simulation model, many dynamic performances of tapered roller bearing are analysed. According to the dynamic performance, the optimization of structural parameters is completed, which provides a theoretical basis and reference for bearing design and analysis.The main works of this paper are as follows:(1) Based on the structural parameters and geometry relationship of the tapered roller bearing, the kinematic relations of internal components in tapered roller bearing are analyzed. The kinematic formulas for the tapered roller bearing under the pure rolling condition are derived, which provide the theoretical criterion for the bearing skidding. The interaction forces between the internal bearing elements and the dynamic equations are discussed, which provide the theoretical basis for bearing's analysis and optimization.(2) According to bearing's parameters, constraint and working conditions, geometric and physical models are established. The user subroutines used in the contact module of dynamic model for the tapered roller bearing is programmed by combining secondary developing function of RecurDyn with the theory of the bearing components interaction. Through the former several models, the dynamic model of bearing is established.(3) In order to verify the accuracy of the dynamic model, the cage skidding rate obtained from the model under two conditions including different rotation speed and axial load is compared with the data from S.Cretu, which indicate the credibility of the proposed model. Based on the model, the influences of bearing speed and axial load on the dynamic performances including the contact load between the roller and the bearing raceway, mass center trace of bearing cage are analyzed.(4) The quantitative index of roller skidding is presented from the perspective of roller slipping. Based on optimization objective function of roller skidding rate, the optimization design of the structure parameters including the roller length and the roller cone angle are completed by using the RecurDyn automatic optimization technique.