Bearing Retainer Designs and Retainer Instability Failures in Spacecraft Moving Mechanical Systems

Sathyan, K.; Gopinath, K.; Lee, Sang‐Heon; Hsu, Hung-Yao

doi:10.1080/10402004.2012.675118

Cited by 52 publications

(21 citation statements)

References 12 publications

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“…with c ≈ 1.5 [13] d therm = d 0 · ϑ · α. [14] The considerations concerning cage friction show that a reduced clearance between the cage and the outer ring will result in a lower possible eccentricity of the cage and thereby reduce the normal contact forces in the cage ring contact and thus the frictional forces.…”

Section: Theory and Calculationsmentioning

confidence: 99%

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Cage Friction in High-Speed Spindle Bearings

Brecher

Hassis

Rossaint

2013

Tribology Transactions

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Friction-induced heat is one of the main reasons for the upper speed limit of high-speed angular contact ball bearings (spindle bearings). One source of friction inside the bearing is the cage. In this article, it is shown through experimental results that the frictional losses due to the cage are of significant magnitude. Based on measurements, a new, simple calculation model is proposed to estimate the cage induced frictional losses in spindle bearings under high rotational speed with minimal lubrication. The cage is assumed to rotate eccentrically around the bearing's axis and to be in contact with the outer ring at just one position. One single ball at the same position is assumed to drive the cage. Thereby, the friction between the cage and the outer ring is transformed in a breaking torque for the inner ring and the shaft. Both the cage outer ring contact and the ball cage contact are handled according to Coulomb's law of friction. Despite its simplicity, this model shows a close correlation with experimental results. Consideration of the centrifugal and thermal expansion provides insight into the relation between cage clearance and cage friction and hence allows for the development of new cage designs. Finally, the design and experimental results of optimized cages made of polyether ether ketone (PEEK) are presented.

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Section: Theory and Calculationsmentioning

confidence: 99%

“…By various experiments, Sathyan, et al (13) showed that the size and shape of the cage pocket geometry as well as the design of the cage guiding land can have a significant influence on the cage frictional moment and the stable operation of the cage.…”

Section: Introductionmentioning

confidence: 99%

Cage Friction in High-Speed Spindle Bearings

Brecher

Hassis

Rossaint

2013

Tribology Transactions

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“…Ball-pocket clearances is three levels, in circular pocket design clearances are 0.6, 1.2 and 1.8 mm, in elliptical pocket design clearances are 1.2, 2.4 and 3.6 mm. The elliptical pocket design is made same design of previous study that elliptical pocket design [7].…”

Section: Introductionmentioning

confidence: 99%

“…As contact area between inner surface of elliptical pocket and ball is larger than circular pocket, elliptical pocket design contributed to a reduction in contact stress and wear of the pocket and to an increase in the supply of solid-lubricant from the cage. Experimental investigation studied retainer instability, which is characterized by intermittent torque fluctuations and severe audible noise, correlated to bearing retainer designs [7].…”

Section: Introductionmentioning

confidence: 99%

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

Ryu

Choe

Lee

et al. 2015

Mechanisms and Machine Science

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This paper made an experimental investigation of cage instability in respect to cage pocket designs, ball-pocket clearances, and flow rate in cryogenic environment. Test bearing bore size is 70 mm deep groove ball bearing. Cage pocket designs are circular and elliptical, and ball-pocket clearances are 0.6, 1.2, 1.8 mm. Test is operating at 6000 rpm during 1500 s in liquid nitrogen. As a several criterions of wear and stability for cryogenic ball bearing, we measured a friction coefficient of bearing and sound vibration FFT were measured and analyzed to predict failure mechanism of bearing elements. From these results, predicted and diagnosed with sound properties of cage, inner/outer race and balls. These works will be assessed more stable with optimum ball-pocket clearance and elliptical pocket design bearing in sufficient coolant.

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“…The development of highly swift and quick maneuverable aircraft technology is increasingly demanding on spatial high speed rotor bearings. According to the statistical analysis of in-orbit faults of satellites [2][3], over 50% of attitude and orbit control system faults result from gyroscopes, momentum wheels, and other spatial moving parts, wherein lubrication faults of bearings occupy a higher ratio [4].…”

Section: Introductionmentioning

confidence: 99%

Lubrication Characteristics Analysis of a Rotor Bearing for Space Application

Huang¹

2019

IJPE

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Concerning the problem of lubrication failure of high speed rotor bearings, a unified model of mixed lubrication is built for angular contact ball bearings with comprehensive consideration of the effects of contact geometry, real rough surface topography, elastic deformation, rheological properties of lubricants, high speed spinning properties of balls, and other factors. On this basis, the effect laws of rotate speed, load, vacuum, high and low temperature, and other working and environmental conditions on the contact and lubrication properties of the microscopic transmission interface of a bearing are analyzed, laying a theoretical basis for the application of high speed rotor bearings in a multi-stress space environment.

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Bearing Retainer Designs and Retainer Instability Failures in Spacecraft Moving Mechanical Systems

Cited by 52 publications

References 12 publications

Cage Friction in High-Speed Spindle Bearings

Cage Friction in High-Speed Spindle Bearings

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

Lubrication Characteristics Analysis of a Rotor Bearing for Space Application

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