Effects of slide-to-roll ratio and varying velocity on the lubrication performance of grease at low speed

Han, Yiming; Wang, Jing; Jin, Xuyang; Wang, Rongpin; Zhang, Rui

doi:10.1177/1350650121993362

Cited by 5 publications

(5 citation statements)

References 30 publications

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“…Although the grease BEM 41-141 owns a superior performance under pure rolling condition, after only 40 cycles, severe starvation and surface scratches have happened. The results supported that conclusion made by the authors 47 that the increase of the slide-roll ratio is detrimental.…”

Section: Discussionsupporting

confidence: 92%

Evolution of grease lubrication regimes and surface damage during reciprocation-oscillation transformation

Han

Wang

Liu

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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The responses of two kinds of lithium greases during the transformation from reciprocating motion to oscillation were firstly studied on a ball-on-disk test rig using optical interferometric technique. Although in pure rolling motion, after a long run a thin film lubrication (TFL) state is formed on the track, in simple sliding motion an interior boundary lubrication (BL) region is quickly developed in the contact after only tens of working cycles and the region increases with the increase of the radius stroke ratio. Microstructure of the thickener fiber makes a difference in the formation of the inside BL region. By an SRV tester, grease lubricated wear tests were carried out using samples with smooth surfaces, textured surfaces and textured + diamond like carbon (DLC) coated surfaces in simple sliding reciprocating and oscillating motion. It is seen that lubrication using grease with thinner and evenly distributed thickener fibers produces less severe surface damage. The smooth or textured surface is soon worn out, causing severe surface damage. The application of DLC coating onto the textured surface can protect the surface well but increase the friction coefficient a little bit.

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Section: Discussionsupporting

confidence: 92%

Evolution of grease lubrication regimes and surface damage during reciprocation-oscillation transformation

Han

Wang

Liu

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Firstly, the minimum speed of 0.02 m/s selected in the study is already the critical speed of Centoplex 3 under pure rolling conditions. Secondly, according to the research conclusions of Han et al [17], the fiber clusters of the grease thickener in the region decreased significantly with the increase in the slide-to-roll ratio. From the comparison of Figures 3, 5, and 7, it can be seen that under the condition of a low sliding speed, the adhesive wear of the contact area is the most serious.…”

Section: Centoplex 3 Greasementioning

confidence: 88%

Section: Centoplex 3 Greasementioning

confidence: 88%

Occurrence of Grease Lubricated Impact-Sliding Composite Wear

Han

Zhang

et al. 2022

Lubricants

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In industrial chain drives, the sleeve slides on the pin and impact loading occurs due to the polygon effect, while the collision between the ball and cage usually produces an impact-sliding motion in the rolling element bearings. Aiming at addressing the occurrence of surface damage caused by the impact-sliding motion, a ball–disk test rig employing optical interference technology was designed and built to realize load variation. Two kinds of commercial grease types, Klüber Centoplex 3 and Centoplex 2EP, were used in the experiments when the glass disk slides at a constant speed while the steel ball collides into them. The sliding and impact motions were controlled by PLC programming. After the experiments, the mid-section grease film distributions were measured using DIIM software. The results show that surface damage can rapidly occur even in the first working cycle, and that the phenomenon is affected by the sliding speed, maximum load, and grease consistency. When the sliding speed is low, multiple contacts of asperity peaks occur in the interior contact region and develop into adhesive wear. When the sliding speed increases, surface wear starts to occur at the side-lobe position of the elastohydrodynamic lubrication (EHL) horseshoe shape and extends with time accompanied by obvious surface scratches. The wear mechanism investigated provides valuable visible information for the further exploration of impact-sliding composite wear. It is suggested that great attention should be paid to impact-sliding wear occurring with grease lubrication since such working conditions are very common in industrial applications.

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“…The speed of bearing rotation significantly impacts the lifespan of the grease [112]. The higher rotation speeds increase the shear stress on the grease, which can damage its fibrous structure and shorten its lifespan [113,114].…”

Section: Selection Of Bearing Greasementioning

confidence: 99%

Review of Wind Power Bearing Wear Analysis and Intelligent Lubrication Method Research

Peng,

Zhao,

Shangguan

et al. 2023

Coatings

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With the significant penetration of wind generation, wind turbines require higher and higher lubrication performance for bearings. To improve the lubrication performance of wind power bearings, this study takes wind power bearings as the research object and comprehensively analyzes the wear forms of wind power bearings as well as intelligent lubrication methods. Firstly, the main roles and wear forms of wind turbine bearings are sorted out and analyzed. Secondly, the common lubrication problems of wind power bearings are analyzed from the bearing grease selection, lubrication mode, and lubrication status, highlighting the important influence of lubrication on bearings. Thirdly, the wind turbine bearing wisdom lubrication method research and organization, mainly including the wind power generation bearing lubrication materials, lubrication devices and monitoring methods, and other issues of research and analysis. Finally, current challenges and future development directions are summarized, which are designed to provide theoretical reference and technical support for the related research and engineering practice in the field of wind power engineering.

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Effects of slide-to-roll ratio and varying velocity on the lubrication performance of grease at low speed

Cited by 5 publications

References 30 publications

Evolution of grease lubrication regimes and surface damage during reciprocation-oscillation transformation

Evolution of grease lubrication regimes and surface damage during reciprocation-oscillation transformation

Occurrence of Grease Lubricated Impact-Sliding Composite Wear

Review of Wind Power Bearing Wear Analysis and Intelligent Lubrication Method Research

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