Experimental study on dynamic behavior of ball bearing cage in cryogenic environments, Part I: Effects of cage guidance and pocket clearances

Choe, Bokseong; Lee, Jeonkook; Jeon, Doyoung; Lee, Yongbok

doi:10.1016/j.ymssp.2018.06.018

Cited by 61 publications

(28 citation statements)

References 20 publications

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“…Ł.Gorycki and his colleagues analyzed the impact of the cage type on the frictional moment of ball bearings and showed that the type of cage used in ball bearings has a significant impact on the frictional moment [5]. B.Choe and his colleagues investigated the dynamic behavior of ball bearing cage (polytetrafluoroethylene (PTFE) cages are used as solid lubricants in such environments) in cryogenic environments and suggested (PTFE) cages [6]. Y.Cui and his colleagues investigated the vibration effect analysis of ball dynamic unbalance on the cage of high-speed cylindrical ball bearing and concluded that the increase of the radial load of the bearing, to a certain extent, can reduce the vibration of cage considering the ball dynamic unbalance [7].…”

Section: Literature Reviewmentioning

confidence: 99%

An Experimental and Numerical Evaluation of Seal Strictness on Ball Bearing Performance

Özdemir¹,

Türkbaş²,

Sarıgöz³

2021

Hittite J. Sci. Eng.

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Section: Literature Reviewmentioning

confidence: 99%

An Experimental and Numerical Evaluation of Seal Strictness on Ball Bearing Performance

Özdemir¹,

Türkbaş²,

Sarıgöz³

2021

Hittite J. Sci. Eng.

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“…Under such circumstances, solid lubrication of REBs is considered a viable alternative [1][2][3]. In recent years, several groups studied the behaviour of REBs lubricated by pure PTFE or PTFE composites [4,5]. Unfortunately, attempts to lubricate a REB with an initially applied PTFE layer fails, since the latter is removed within short time by high pressure and shear in the rolling contacts [6].…”

Section: Introductionmentioning

confidence: 99%

A Combined Experimental and Atomistic Investigation of PTFE Double Transfer Film Formation and Lubrication in Rolling Point Contacts

et al. 2021

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Solid lubricants such as polytetrafluoroethylene (PTFE) are used in rolling-element bearings (REBs) when conventional lubrication (i.e. by fluids or greases) cannot be applied owing to extreme operating conditions (e.g. high temperatures or vacuum). Often a double transfer film mechanism is used with a cage acting as a lubricant reservoir resupplying the REB with solid lubricant by cage wear. An increase in service life of such bearings requires a better understanding of the transfer processes in the sliding and rolling contacts. Here, we investigate the effect of PTFE resupply on friction and lubricant film formation in a steel/steel and steel/glass rolling contact by tribometry and classical molecular dynamics (MD). A ball-on-disk tribometer is enhanced by a pin-on-disk sliding contact that transfers PTFE to the disk. The experiment allows simultaneous in situ measurement of friction and film thickness by white light interferometry in the rolling point contact. Increasing the pin load results in an increased PTFE film thickness in the rolling contact accompanied by a significant decrease in friction. To elucidate the observed film transfer and friction mechanism, sliding MD simulations with a newly developed density-functional-based, non-reactive force field for PTFE-lubricated iron oxide surfaces are performed. A strong adhesion of PTFE chains to iron oxide drives transfer film formation, whilst shear-induced chain alignment within PTFE results in reduced friction. The simulations reveal an anti-correlation between PTFE film thickness and friction coefficient—in agreement with the experiments. These investigations are a first step towards methods to control PTFE transfer film formation in REBs. Graphic Abstract

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Section: Introductionmentioning

confidence: 99%

A Combined Experimental and Atomistic Investigation of PTFE Double Transfer Film Formation and Lubrication in Rolling Point Contacts

Goeldel

Reichenbach

König

et al. 2021

Preprint

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Solid lubricants such as polytetrafluoroethylene (PTFE) are used in rolling-element bearings (REBs) when conventional lubrication (i.e. by fluids or greases) cannot be applied owing to extreme operating conditions (e.g. high temperatures or vacuum). Often a double transfer film mechanism is used with a cage acting as a lubricant reservoir resupplying the REB with solid lubricant by cage wear. An increase in service life of such bearings requires a better understanding of the transfer processes in the sliding and rolling contacts. Here, we investigate the effect of PTFE resupply on friction and lubricant film formation in a steel/steel and steel/glass rolling contact by tribometry and classical molecular dynamics (MD). A ball-on-disk tribometer is enhanced by a pin-on-disk sliding contact that transfers PTFE to the disk. The experiment allows simultaneous in situ measurement of friction and film thickness by white light interferometry in the rolling point contact. Increasing the pin load results in an increased PTFE film thickness in the rolling contact accompanied by a significant decrease in friction. To elucidate the observed film transfer and friction mechanism, sliding MD simulations with a newly developed density-functional-based, non-reactive force field for PTFE-lubricated iron oxide surfaces are performed. A strong adhesion of PTFE chains to iron oxide drives transfer film formation, while shear-induced chain alignment within PTFE results in reduced friction. The simulations reveal an anti-correlation between PTFE film thickness and friction coefficient – in agreement with the experiments. These investigations are a first step towards methods to control PTFE transfer film formation in REBs.

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Experimental study on dynamic behavior of ball bearing cage in cryogenic environments, Part I: Effects of cage guidance and pocket clearances

Cited by 61 publications

References 20 publications

An Experimental and Numerical Evaluation of Seal Strictness on Ball Bearing Performance

An Experimental and Numerical Evaluation of Seal Strictness on Ball Bearing Performance

A Combined Experimental and Atomistic Investigation of PTFE Double Transfer Film Formation and Lubrication in Rolling Point Contacts

A Combined Experimental and Atomistic Investigation of PTFE Double Transfer Film Formation and Lubrication in Rolling Point Contacts

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