Investigation on stability and slip characteristic of the cage in cylindrical roller bearing with localized failure on raceways

Abstract

The vibration characteristics of the cylindrical roller bearings (CRBs) with localized failures have been extensively discussed. However, there remains a lack of precise understanding regarding how failures affect the dynamical behavior of the bearing cage. Therefore, for investigating the operating mechanism of the cage in bearing with failures, a modeling approach for calculating the contact force between components is developed, and a simulation model of CRBs with localized failure on raceways is proposed. Moreover, the model established is confirmed experimentally using the vibration response. The result shows that when the rotating speed and radial load are increased, the behavior change of the cage can be divided into three processes, and the increased radial load may cause the cage operation to transition into a vortex state at an accelerated rate. The running stability and slip rate of cage are also critically affected by the bearing internal size. Then, the generation mechanism of cage vortex and slip characteristics is analyzed, the excellent performance of cage is closely related to the collision force and collision frequency between guide ring and cage, excessive contact between cage and roller will directly threaten the dynamic behavior of cage. When there are localized failures on raceway, the shock will be generated when the rollers pass through the failure zone, the collision force and collision frequency between rollers and cage will be considerably increased, while the collision frequency between guide ring and cage is reduced, which makes the cage operation stability decreased and skid rate increased.