Cage Instabilities in High-Speed Cylindrical Roller Bearings

A dynamic model of the cage in an oil-lubricated cylindrical roller bearing was developed and the cage whirl has been researched by this model. In model, the forces between elements, especially the effect of EHL (Elastic Hydrodynamic Lubrication) between cage pockets and rollers were fully considered according to the geometry relationship between elements. The effects of variation in clearance ratio, load and bearing operating velocity on cage whirl have been investigated. The results of the effect of cage clearance on cage instability basically accord with the Gupta’s results, but the starting time of the direct contact between cage and guiding race is delayed while the EHL was considered. The effect of normal load is more important than bearing angular velocity on cage whirl.

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Skidding research of a high-speed cylindrical roller bearing with beveled cage pockets

Industrial Lubrication and Tribology ◽

10.1108/ilt-10-2019-0414 ◽

2020 ◽

Vol 72 (7) ◽

pp. 969-976

Author(s):

Yanbin Liu ◽

Zhanli Zhang

Keyword(s):

Peer Review ◽

Tilt Angle ◽

High Speed ◽

Hydrodynamic Lubrication ◽

Roller Bearing ◽

Front Wall ◽

Dynamics Model ◽

Content Type ◽

Cylindrical Roller Bearing ◽

Cylindrical Roller

Purpose This study aims to uncover the influencing mechanism of the tilt angles of the cage pocket walls of the high-speed cylindrical roller bearing on the bearing skidding. Design/methodology/approach A novel cylindrical roller bearing with the beveled cage pockets was proposed. Using the Hertz contact theory and the elastohydrodynamic and hydrodynamic lubrication formulas, the contact models of the bearing were built. Using the multibody kinematics and the Newton–Euler dynamics theory, a dynamics model of the bearing was established. Using the Runge–Kutta integration method, the dynamics simulations and analysis of the bearing were performed. Findings The simulation results show that the effects of the tilt angles of the front and rear walls of the pocket on the bearing skidding are remarkable. Under a 5° tilt angle of the front wall of the pocket and a 10° tilt angle of the rear wall, the bearing skidding can be effectively decreased in the rotational speed range of 10,000-70,000 r/min. Originality/value In this paper, a novel cylindrical roller bearing with the beveled cage pockets was proposed; a dynamics model of the bearing was established; the influence mechanism of the tilt angles of the front and rear walls of the pocket on the bearing skidding was investigated, which can provide fundamental theory basis for optimizing the pocket. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-01-2020-0035/

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Stiffness Analysis of High-speed Cylindrical Roller Bearing Subjected to Combined Loads

10.1109/phm-nanjing52125.2021.9613096 ◽

2021 ◽

Author(s):

Yaoyu Han ◽

Lihua Yang ◽

Tengfei Xu ◽

Endian Xu

Keyword(s):

High Speed ◽

Roller Bearing ◽

Stiffness Analysis ◽

Combined Loads ◽

Cylindrical Roller Bearing ◽

Cylindrical Roller

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Experimental Study on the Skidding Damage of a Cylindrical Roller Bearing

Materials ◽

10.3390/ma13184075 ◽

2020 ◽

Vol 13 (18) ◽

pp. 4075 ◽

Cited By ~ 1

Author(s):

Qing Zhang ◽

Jun Luo ◽

Xiang-yu Xie ◽

Jin Xu ◽

Zhen-huan Ye

Keyword(s):

High Speed ◽

Large Scale ◽

Failure Modes ◽

Roller Bearing ◽

Weight Ratio ◽

Operating Conditions ◽

Roller Bearings ◽

Light Load ◽

Cylindrical Roller Bearing ◽

Cylindrical Roller

As large-scale rotating machines develop toward high rotating speed and high power–weight ratio, skidding damage has become one of the major initial failure modes of cylindrical roller bearings. Therefore, understanding the skidding damage law is an effective way to ensure the safety of machines supported by cylindrical roller bearings. To realize the skidding damage, a high-speed rolling bearing test rig that can simulate the actual operating conditions of aviation bearings was used in this paper, and the skidding damage dynamic behaviors of cylindrical roller bearings were investigated. In addition, to ensure the accuracy of the obtained skidding damage mechanism, the cylindrical roller bearing was carefully inspected by microscopic analysis when the skidding damage occurred. Out results show that instantaneous increases in friction torque, vibration acceleration, and temperature are clearly observed when the skidding damage occurs in the cylindrical roller bearing. Furthermore, under the conditions of inadequate lubrication and light load, the critical speed of skidding damage is rather low. The major wear mechanisms of skidding damage include oxidation wear, abrasive wear, and delamination wear. The white layers are found locally in the inner ring and rollers under the actions of friction heat and shear force.

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Influence of roller defect and coupled roller–inner–outer race defects on the performance of cylindrical roller bearing

Proceedings of the Institution of Mechanical Engineers Part K Journal of Multi-body Dynamics ◽

10.1177/1464419318819332 ◽

2019 ◽

Vol 233 (3) ◽

pp. 731-746 ◽

Cited By ~ 1

Author(s):

Sachin P Patel ◽

S H Upadhyay

Keyword(s):

Nonlinear Equations ◽

Normal Load ◽

Roller Bearing ◽

Surface Irregularity ◽

Outer Race ◽

Cylindrical Roller Bearing ◽

The Time Domain ◽

Internal Gap ◽

Thrust Load ◽

Cylindrical Roller

In the present study, a novel mathematical model is developed for the deformation between roller and races of cylindrical roller bearing using the effect of tilting and skewing of roller due to thrust load, radial deflection due to normal load, radial internal gap, and individual defect on roller as well as coupled defect on all races and roller. Also, novel roller defect function is proposed for the preparation of simultaneous nonlinear equations. MATLAB is used to solve nonlinear equations for equilibrium conditions of deflection, radial load, thrust load, moment in plane, and total roller loading. However, waviness due to surface irregularity on both races as well as out-of-balance assembly is not considered in this analysis. The bearing is analyzed for individual roller defect as well as coupled races–roller defects to identify the behavior of bearing under speed-varying conditions. The equation of motion is solved through Newmark-β technique. Defect segment of roller consecutively in contact with both races results in higher acceleration. Time-to-impact concept is utilized for the analysis. The acceleration during roller–race defect interaction with intermittent connection is applied in the model for observation. The outcomes are shown in the time domain, orbit, and envelope analysis, which describe the complexity of the system with speed variation for roller defect and coupled roller–inner–outer race defects. The periodic, quasi-periodic, and chaotic phenomena are observed for roller and coupled defects. Simulated frequencies for all defects are compared with theoretical frequencies to validate the model.

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