Correlation Between Friction Coefficient and Sound Characteristics for Cage Instability of Cryogenic Deep Groove Ball Bearings

Ryu, Solji; Choe, Bokseong; Lee, Jeonkook; Lee, YongBok

doi:10.1007/978-3-319-06590-8_159

Cited by 10 publications

(2 citation statements)

References 6 publications

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“…Adams [12] indicated that the geometry of the cage was a major contributor to the instability of the bearings. Ryu [13] experimentally investigated the cage instability with respect to ball-pocket clearances by measuring the friction coefficient of bearing and sound vibration and found larger ball-pocket clearance to be more stable. Sathyan [14] compared the frictional torque under circular pocket to square pocket retainers and pointed out that the circular pocket showed low frictional torque and was more prone to instability compared to the square pocket.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Clearance Influences on Cage Motion and Wear in Ball Bearings

et al. 2021

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Clearances of cages in ball bearings, including pocket and guiding clearances, play a vital role in the stability and reliability of bearings. In this paper, experiments on the cage motion and wear were carried out to investigate the influence of clearances in ball bearings. Firstly, the cages with a series of pocket and guiding clearances were specially designed and tested for prescribed operating conditions on a bearing test rig in which the cage motions were measured, and corresponding wear was also observed. Then, the normalized trajectory, waveform, and spectra of cage motion were constructed and compared to illustrate the effects of clearances on the cage motion and then to establish the relationship between cage motion and wear. Results reveal that the cage motion and wear are both significantly affected by its clearances. The increment of cage guiding clearance makes the whirl trajectories of the cage regular and the motion frequency of cage motion significantly change. However, the increment of cage pocket clearance make the whirl trajectories change from well-defined patterns to complicated ones, and the frequency of cage motion apparently changes. Additionally, the bearing wear is closely related to the cage motion. If the inner ring frequency is of domination for the cage motion, the cage guiding surface will wear seriously. While cage motion is dominated by two times cage frequency in spectrum domain, the cage pocket will wear more seriously.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Clearance Influences on Cage Motion and Wear in Ball Bearings

et al. 2021

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“…Nogi, et al [26] studied the motion of a ball-bearing cage by using a dynamic analysis program and concluded that an increase in traction coefficient could result in the unstable motion of the cage. Ryu, et al [27] analyzed the stability of the cage by the Fourier transform of the coefficient of friction and sound vibration. Wen, et al [28] developed a calculation model to analyze the dynamics of bearings, taking into account non-Newtonian fluids.…”

Section: Introductionmentioning

confidence: 99%

Study on Cage Stability of Solid-Lubricated Angular Contact Ball Bearings in an Ultra-Low Temperature Environment

Su,

Li,

Zhang

et al. 2024

Lubricants

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In the ultra-low temperature environment, the material properties of the bearing change, which puts forward higher requirements for the dynamic performance of the bearing cage. The bearings operating in ultra-low temperature environments commonly use solid lubricants. This study first focused on measuring the traction coefficients of molybdenum disulfide (MoS2) solid lubricant in a nitrogen atmosphere, and the Gupta fitting model is constructed to derive the traction equation. Subsequently, the dynamic differential equation of angular contact ball bearings was established, and the stability of the bearing cage in a nitrogen environment was simulated and analyzed based on the dynamic model. The accuracy of the simulation model was verified through comparison. The results show that less than 10% of errors exist between the experimental data and the traction curve fitted by the Gupta model, and the stability of the cage is closely related to operating parameters and bearing structure parameters. Cage stability increases with axial load but decreases with radial load. The cage stability is optimal when the radial internal clearance of the bearing is approximately 0.06 mm. When other conditions remain unchanged and the ratio of the cage pocket hole gap to the cage guide surface gap is 0.2, the cage stability is the best. The research results will provide a foundation for the design and application of solid-lubricated angular contact ball bearings in ultra-low temperature environments.

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Motion stability analysis of cage of rolling bearing under the variable-speed condition

Liang

et al. 2023

Nonlinear Dyn

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The fluctuation of cage rotating speed will lead to the strong instability of the cage movement of the rolling bearing, which will seriously affect the operation performance and service life of the bearing. In this paper, a nonlinear dynamic model of cylindrical roller bearing NJ306 is established considering the dynamic contact relationship between the roller, the ring, and the cage. The variation of cage motion characteristics and its internal mechanism under the uniform, acceleration, deceleration, and harmonic speed fluctuation are discussed respectively, and the effects of angular acceleration, angular deceleration, amplitude, and period of fluctuation on cage stability are analyzed. The results show that the motion stability of the cage is poor under the variable-speed condition, and it weakens first and then increases under the acceleration condition. Different from the acceleration condition, the motion stability of the cage decreases gradually with the increase of time during deceleration and increases at the end of deceleration. Moreover, the increase of angular acceleration and deceleration increases the variation range of cage motion stability. Under the condition of harmonic speed fluctuation, the stability of the cage increases and decreases periodically with time. The increase of fluctuation amplitude will enhance the motion stability of the cage under the condition of simple harmonic speed fluctuation, and the fluctuation period is the opposite. The results of this paper can provide a theoretical basis for the design and failure analysis of cage.

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Correlation Between Friction Coefficient and Sound Characteristics for Cage Instability of Cryogenic Deep Groove Ball Bearings

Cited by 10 publications

References 6 publications

Experimental Investigation of Clearance Influences on Cage Motion and Wear in Ball Bearings

Experimental Investigation of Clearance Influences on Cage Motion and Wear in Ball Bearings

Study on Cage Stability of Solid-Lubricated Angular Contact Ball Bearings in an Ultra-Low Temperature Environment

Motion stability analysis of cage of rolling bearing under the variable-speed condition

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