Analysis of High-Speed Inter-Shaft Cylindrical Roller Bearing with Flexible Rings

摘要

For high precision mechanism, such as machine tools or gas turbine engines, in addition to extreme operating conditions, it is particularly important to accurately predict the behavior of the included bearing. This prediction includes among others its load distribution, stiffness, and power dissipation. While shaft speeds tend to increase, rings and shaft walls are becoming thinner due to size and weight constraints. Thus, bearing behavior is no longer independent of the housing and ring stiffness. This paper focuses on the problem of elastic ring deformation and certain behaviors of high speed intershaft cylindrical roller bearing such as heat dissipation, contact pressure and risk of bearing failure due to scuffing. The paper presents an analytical method to account for the structural deformation of the rings based on Roark's formulas. The elastic deformation of thin cylindrical rings has been introduced in the set of displacement and load equations that describes the bearing equilibrium. A correlation with a high-speed intershaft cylindrical roller bearing application is made and the results are compared with those obtained with the Finite Element Method (FEM) for housing deformations Heat dissipation, load distribution, contact pressure and internal kinematics are discussed to evaluate co-rotating and contra-rotating shafts design solutions.