Prevention of Smearing Damage in Cylindrical Roller Bearings

Evans, Ryan D.; Barr, Todd; Houpert, L.; Boyd, Steven V.

doi:10.1080/10402004.2013.788236

Cited by 58 publications

(55 citation statements)

References 11 publications

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“…Given this general mechanism, random variations in surface roughness or local friction can trigger a sudden and unexpected onset of scuffing, and in practice, it is not unusual to observe two seemingly identical machines have very different scuffing performance. Some practical examples of scuffing include those in gears, large slow rotating bearings, where the rolling elements undergo significant slowdown in the unloaded zone and so experience high sliding speeds at the re-entry to the loaded zone [6], for example in wind turbine gearbox bearings [7], piston ring liner contacts in combustion engines [8] and cam-followers. If left unchecked, scuffing can lead to the affected components losing their surface integrity and functionality, resulting in a shutdown of the affected system with associated downtime costs.…”

Section: Introductionmentioning

confidence: 99%

The Development and Application of a Scuffing Test Based on Contra-rotation

2019

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Scuffing is a surface failure mode that occurs in sliding-rolling contacts subjected to high loads and high sliding speeds, such as those in gears and cam-followers. Owing to its sudden onset, rapid progression and dependence on both fluid and boundary lubricant films, scuffing is difficult to study in a repeatable manner. This paper describes further development of a recently proposed scuffing test method based on contra-rotation, its extension to higher loads using a new experimental setup and its application to study the onset of scuffing with a selection of model and fully-formulated oils. The method employs two surfaces moving in opposite directions under rolling-sliding conditions, with a fixed load and step-wise increasing sliding speed. By decoupling the entrainment and sliding speeds, the method allows the effects of lubricant formulation on scuffing performance to be isolated from the influence of viscosity. The approach achieves high sliding speeds in parallel with low entrainment speeds, while minimising the undesirable effects of surface wear and frictional heating. The proposed test is relatively fast and economical, with total test time of about 30 min including specimen cleaning and setup. Results show that the newly implemented modifications have improved the repeatability of the test method, so that the number of repeat tests required for reliable oil ranking results is minimal. Tests with model and fully-formulated oils show that the onset of scuffing is characterised by a sharp and unrecoverable increase in friction and accompanied by the destruction of any boundary films. All tests show that the relationship load × speed n = constant holds at scuffing, with the exact value of the exponent n being dependent on the oil formulation. Additivised oils were shown to have enhanced scuffing resistance, which arises from their ability to postpone the uncontrollable rise in friction to higher sliding speeds. Finally, the critical maximum contact temperature scuffing criterion was shown to predict the onset of scuffing in our tests better than the frictional power intensity criterion.

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Section: Introductionmentioning

confidence: 99%

The Development and Application of a Scuffing Test Based on Contra-rotation

2019

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“…Sliding-rolling contacts have been widely studied for bearings and gears [1,13,14]. Sliding can arise from speed differential between the rolling elements, or from a difference of curvatures like in the spherical roller thrust bearings [15].…”

Section: Presentation Of the Calculation Methodsmentioning

confidence: 99%

Experimental simulation of rolling–sliding contact for application to planetary roller screw mechanism

Aurégan

Fridrici

Kapsa

et al. 2015

Wear

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“…In all recorded occurrences of smearing the maximum value of FPI lies in the relatively narrow range of 105 MW/m 2 to 140 MW/m 2 , despite the fact the load varies by an order of magnitude. The FPI has been considered as a scuffing criterion by Bell and Dyson [19] amongst others and has also been considered as a potential smearing criterion [3,10].…”

Section: Discussionmentioning

confidence: 99%

An Experimental Investigation into the Onset of Smearing Damage in Nonconformal Contacts with Application to Roller Bearings

Fowell

Ioannides

Kadiric

2014

Tribology Transactions

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The onset of smearing damage was studied under controlled conditions in a custom test rig that simulates the passage of a rolling element through loaded and unloaded zones of a rolling bearing. The set-up comprises a spherical roller which is intermittently loaded between two bearing raceways driven at a prescribed speed. The roller is free to accelerate during the loading phase. Contact load, roller speed and acceleration and electrical contact resistance are recorded during the test. Contact shear stress, friction coefficient, frictional power intensity and elastohydrodynamic film thickness are calculated from the recorded kinematics data. Results suggest that the first onset of smearing occurs early in the loading phase where the roller is nearstationary and the frictional power intensity is high. The raceway speed at the onset of damage decreases with increasing load and increasing lubricant supply temperature. The maximum frictional power intensity is found to be relatively constant at all contact conditions that led to 2 smearing. An existing thermo-mechanical contact model is used to estimate the contact temperature distribution under smearing conditions and the potential for EHL film thickness reduction due to forward heat conduction.

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Prevention of Smearing Damage in Cylindrical Roller Bearings

Cited by 58 publications

References 11 publications

The Development and Application of a Scuffing Test Based on Contra-rotation

The Development and Application of a Scuffing Test Based on Contra-rotation

Experimental simulation of rolling–sliding contact for application to planetary roller screw mechanism

An Experimental Investigation into the Onset of Smearing Damage in Nonconformal Contacts with Application to Roller Bearings

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