On the effect of starved lubrication on elastohydrodynamic (EHL) line contacts

Ebner, Martin; Yilmaz, M.; Lohner, Thomas; Michaelis, Klaus; Höhn, Bernd‐Robert; Stahl, Karsten

doi:10.1016/j.triboint.2017.06.004

Cited by 34 publications

(12 citation statements)

References 5 publications

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“…For the test gear of type LowLoss, a strong reduction of T LP is achieved and the operating range under MQ lubrication is extended. The results are in agreement with findings of Höhn et al (2009), Mirza et al (2021), Ebner et al (2018) and Bobzin et al (2019Bobzin et al ( , 2020.…”

Section: Comparison Of Dip and Minimum Quantity Lubricationsupporting

confidence: 93%

Gear and bearing power losses: from dip to minimum quantity lubrication

Yilmaz

Önüt²,

Lohner³

et al. 2022

ILT

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Purpose This paper aims to address the influence of lubrication methods on operational characteristics, power losses and temperature behavior of gears and bearings. It contributes to the improvement of resource and energy efficiency of geared transmissions. Design/methodology/approach Experimental investigations were performed at a gear and bearing power loss test rig. Thereby, dip lubrication, injection lubrication with injection volumes from 0.05 to 2.00 l/min and minimum quantity (MQ) lubrication with an injection volume as little as 28 ml/h were considered. Measurements were evaluated in terms of no-load and load-dependent power loss, bulk temperatures and mean gear coefficients of friction. Findings Results show strongly reduced no-load gear and bearing losses for lubrication methods with low lubricant quantities. Load-dependent losses are similar to conventional lubrication methods and tend to be lower at high speed. This is related to higher bulk temperatures, as the heat dissipation of lubrication methods with low oil quantities is limited. Limited thermal load limits were shown to be extended by LowLoss gears. Originality/value Systematic investigations were conducted to evaluate the influence of dip, injection and MQ lubrication on power loss and temperature behavior of gears and bearings. The results of this study support further research on needs-based lubrication methods for gearboxes.

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Section: Comparison Of Dip and Minimum Quantity Lubricationsupporting

confidence: 93%

Gear and bearing power losses: from dip to minimum quantity lubrication

Yilmaz

Önüt²,

Lohner³

et al. 2022

ILT

View full text Add to dashboard Cite

show abstract

“…Studies on gears are performed to eliminate (or at least to reduce) noise and vibrations, to increase power density (to use smaller and lighter gearboxes than before), to realize low-loss gears by minimizing the quantity of lubricant necessary. Gears, with reduced quantities of oil are for instance tested in Ebner et al (2018). A final target could be to arrive to oil-free powertrain, as well as to oil-free engines (Woidt, 1997).…”

Section: Tribology and Energy Savingmentioning

confidence: 99%

Tribology and Industry: From the Origins to 4.0

Ciulli

2019

Front. Mech. Eng.

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There is an increasing diffusion of the industry 4. 0 concept today. The fourth industrial revolution, following three other previous industrial revolutions, is considered related to the introduction of modern information and communication technologies in production. Tribological concepts are much older than industry. Tribology has always been connected to industrial problems from the birth of industry. It was strongly connected with the previous industrial revolutions and it is surely related to industry 4.0. In this work, the main aspects of the four industrial revolutions and the main evolutions of tribology are firstly reviewed from a historical point of view. The relationships between tribology and industry are described with particular attention to the aspects that relate the modern tribology 4.0 to industry 4.0. Tribology can have in particular a big impact on the industrial needs to reduce losses and wastes, for instance with the development of new tribological components and materials also in connection with electronic smart systems and taking advantage of the information and communication technologies.

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“…With more conditions taken into consideration, Jadhav et al 19 investigated the combined effects of micro-texture and magnetohydrodynamic lubrication behavior on the performance of an EHL line contact. Ebner et al 20 investigated the effect of starved lubrication on the operating behavior of EHL contacts. Nowadays, numerical simulations are more complicated to apply with the EHL theory and theoretical assumptions.…”

Section: Introductionmentioning

confidence: 99%

Lubrication state identification of the line contact tribo-pair under a pure rolling condition with ultrasonic method

Duan

2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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A line contact tribo-pair is a key mechanism unit in rolling bearings, which is often characterized by ultra-high contact pressure and ultra-thin oil film. Elastohydrodynamic lubrication is often adopted to characterize the lubrication state of such a tribo-pair. As a primary parameter for elastohydrodynamic lubrication, the oil film thickness is often evaluated with simplified theoretical models or complicated measurements. So far, a comprehensive verification of the lubrication states in a real line-contact tribo-pair, however, is rarely reported. Focusing on the roller/ring tribo-pair of a wet-lubricated rolling bearing under pure rolling conditions, this study investigates the lubrication states by integrating multiple theories. Five regions including isoviscous hydrodynamic, piezoviscous hydrodynamic, elastohydrodynamic lubrication, mixture lubrication, and boundary lubrication regions can be identified using the framework. Then, validation experiments are carried out on a line contact tribo-pair test rig under the same operating conditions applied in the theoretical analysis. The oil film thickness is measured by the ultrasonic method. The analysis results demonstrate that only two regions, the elastohydrodynamic lubrication and mixture lubrication regions, can be identified using the experimental data. The identified elastohydrodynamic lubrication and mixture lubrication regions are consistent with theoretical analysis; and the Blok equation and elastohydrodynamic lubrication theory are suggested to calculate the oil film thickness in the elastohydrodynamic lubrication and mixture lubrication regions, respectively. Moreover, the oil film thickness calculated by the Dowson equation is larger than that based on the elastohydrodynamic lubrication theory due to a different viscous pressure equation.

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On the effect of starved lubrication on elastohydrodynamic (EHL) line contacts

Cited by 34 publications

References 5 publications

Gear and bearing power losses: from dip to minimum quantity lubrication

Gear and bearing power losses: from dip to minimum quantity lubrication

Tribology and Industry: From the Origins to 4.0

Lubrication state identification of the line contact tribo-pair under a pure rolling condition with ultrasonic method

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