Operational stability analysis for cage of high-speed cylindrical roller bearings
DENG Sier 1,2 WANG Zibin 1 ZHANG Wenhu 1 HUANG Xiaomin3
1. School of Mechatronics, Henan University of Science and Technology, Luoyang 471003, China；
2. Collaborative Innovation Center of Major Machine Manufacturing in Liaoning, Dalian 116024, China；
3. School of Mechanical Engineering, Chongqing Industry Polytechnic College, Chongqing 401120, China
Based on the dynamics theory of the rolling bearing, the nonlinear dynamic differential equations of high-speed cylindrical roller bearing were established and solved by the predicted-corrected GSTIFF(Gear stiff) integer algorithm with variable steps. Box dimension was used to evaluate the disorder level of orbits of cage's mass center. The influence of cage’s clearance ratio, bearing speed, bearing radial load, bearing radial clearance and the number of rollers on cage operational stability was investigated. The results show that: Box dimension can find the difference between similar orbits of cage’s mass center and describe the operational stability of cage quantitatively; Larger cage’s clearance ratio is not beneficial to cage’s stable operation, and there is an optimum clearance ratio that can make orbits of cage’s mass center whirl in the best effect, and the operation of the cage in the most stable state ; the mass center of cage doesn’t whirl when the rotation speed of inner ring is lower, and the cage center-of-mass orbits is complex, the operation of the cage is unstable; the operational stability of cage increased with the increase of rotation speed and the number of rollers; the operational stability of cage increased firstly and then decreased with the increase of radial load and radial internal clearance.
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