Experimental Comparison of the Behavior between Base Oil and Grease Starvation Based on Inlet Film Thickness

Kostal, David; Šperka, Petr; Křupka, Ivan; Härtl, Martin

doi:10.24874/ti.2017.39.01.12

Cited by 6 publications

(4 citation statements)

References 14 publications

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“…Secondly, bleeding phase of grease lubrication takes place. Oil from the grease replenishes the track as observed by Kostal et al [5], [6]. Wikstrom and Jacobson [7] states that the amount of lubricant in the contact is a balance between the amount of oil bled from grease reservoirs into the contact and the amount of oil lost from the contact by e.g.…”

Section: Introductionmentioning

confidence: 83%

Replenishment Differences in EHL Contact Lubricated by New and In-bearings-aged Grease

Navrátil¹,

Kostal²,

Křupka³

et al. 2020

Tribol. Ind.

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In-contact replenishment differences between new and aged grease are studied using ball-on-disc optical fluorescence. Three different greases were aged in rolling bearings for 30 -50 % of their predicted life. A considerable effort is focused on fluorescence calibration, so that differences in lubricant volume can be quantified. No changes in replenishment between new and aged samples were found in one grease. The other two greases were contaminated by metal particles and iron oxide powder. Grease fluorescence was quenched by contaminants and linear relation between intensity values and film thickness did not apply for samples with heaviest contamination. Nevertheless, strong link between the degree of contamination and lubricant replenishment was found.

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Section: Introductionmentioning

confidence: 83%

Replenishment Differences in EHL Contact Lubricated by New and In-bearings-aged Grease

Navrátil¹,

Kostal²,

Křupka³

et al. 2020

Tribol. Ind.

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“…4. In these cases, the performance of FM is markedly affected by starvation of contact, which was described in detail in [14]. In contrast, the quantities 3 and 4 µl can be considered as the suitable quantities because they exhibit the so-called N-shape behaviour which was described in [15].…”

Section: Laboratory Testsmentioning

confidence: 99%

Case Study: the Influence of Oil-based Friction Modifier Quantity on Tram Braking Distance and Noise

Galas¹,

Omasta²,

Klapka³

et al. 2017

Tribol. Ind.

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In the present study, the twin disc machine and the light rail system was employed in order to investigate the ability of oil-based friction modifier (FM) to optimize adhesion and to reduce noise. The risks associated with poor adhesion conditions after the application of FM were evaluated. Both laboratory and field experiments showed that if the contact is overdosed by FM, the poor adhesion, which results in the extension of braking distance, can occur. In contrast, the smaller quantities do not cause critical adhesion but the effect of FM on the noise reduction is negligible. This study indicates that it can be quite difficult to achieve a reasonable noise reduction without a significant impact on braking distance of tram when the oil-based FM is applied. The field experiments also showed that the carry distance of FM is rather limited, approximately 100 m.

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“…The lubricating oil cannot enter the bearing smoothly under high-speed, heavy-duty conditions. The amount of oil inside the bearing gradually decreases and the starvation state occurs [16][17][18][19][20][21][22]. This phenomenon has attracted a lot of research interest in the field of starvation lubrication.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Lubrication Parameters on the Ceramic Ball Bearing Vibration in Starved Conditions

Zhang

Bai

et al. 2020

Applied Sciences

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The thickness of the oil film in ceramic ball bearings varies greatly at starved lubrication conditions, thus leading to non-uniform contact between the balls and raceways in the circumference. The lubrication parameters have a direct impact on the thickness of the oil film and then affect the dynamic characteristics of the ceramic ball bearings. A nonlinear dynamic model of ceramic ball bearing with limited lubrication is presented in this paper, and parametric studies on the effect of lubrication parameters are conducted. In starved conditions, the uneven contact between the ball and ring leads to changes in vibration, and the inner ring vibration is applied to evaluate the degree of starved lubrication. The results show that as the oil quantity increases, the bearing stiffness increases and results in increased peak frequency. As the oil quantity decreases, the thickness of the oil film reduces, resulting in the bearing vibration increase. The research findings provide a theoretical reference for ceramic ball bearing design and have guided significance for improving the service performance of ceramic ball bearings.

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Experimental Comparison of the Behavior between Base Oil and Grease Starvation Based on Inlet Film Thickness

Cited by 6 publications

References 14 publications

Replenishment Differences in EHL Contact Lubricated by New and In-bearings-aged Grease

Replenishment Differences in EHL Contact Lubricated by New and In-bearings-aged Grease

Case Study: the Influence of Oil-based Friction Modifier Quantity on Tram Braking Distance and Noise

Effect of the Lubrication Parameters on the Ceramic Ball Bearing Vibration in Starved Conditions

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