Predicting friction reliably and accurately in journal bearings—extending the EHD simulation model to TEHD

Allmaier, Hannes; Priestner, Christoph; Reich, Franz Markus; Priebsch, Hans-Herwig; Novotny-Farkas, Franz

doi:10.1016/j.triboint.2012.08.015

Cited by 45 publications

(46 citation statements)

References 14 publications

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“…Previous publications by the authors of this study have already shown that the inclusion of a simplified shell profile allows for a realistic estimation of metalmetal contact [12,15,16].…”

Section: Introductionmentioning

confidence: 79%

Edge loading and running-in wear in dynamically loaded journal bearings

Sander

Allmaier

Priebsch

et al. 2015

Tribology International

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“…Previous publications by the authors of this study have already shown that the inclusion of a simplified shell profile allows for a realistic estimation of metalmetal contact [12,15,16].…”

Section: Introductionmentioning

confidence: 79%

Edge loading and running-in wear in dynamically loaded journal bearings

Sander

Allmaier

Priebsch

et al. 2015

Tribology International

Self Cite

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“…Most of the heat that is generated by friction in the engine is removed by the lubricant [29]. Hence, the lubricant outflow temperature represents the cooling capability of the lubricants.…”

Section: Lubricant Outflow Temperaturementioning

confidence: 99%

Friction Reduction Tested for a Downsized Diesel Engine with Low-Viscosity Lubricants Including a Novel Polyalkylene Glycol

et al. 2017

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Abstract:With the increasing pressure to reduce emissions, friction reduction is always an up-to-date topic in the automotive industry. Among the various possibilities to reduce mechanical friction, the usage of a low-viscosity lubricant in the engine is one of the most effective and most economic options. Therefore, lubricants of continuously lower viscosity are being developed and offered on the market that promise to reduce engine friction while avoiding deleterious mixed lubrication and wear. In this work, a 1.6 L downsized Diesel engine is used on a highly accurate engine friction test-rig to determine the potential for friction reduction using low viscosity lubricants under realistic operating conditions including high engine loads. In particular, two hydrocarbon-based lubricants, 0W30 and 0W20, are investigated as well as a novel experimental lubricant, which is based on a polyalkylene glycol base stock. Total engine friction is measured for all three lubricants, which show a general 5% advantage for the 0W20 in comparison to the 0W30 lubricant. The polyalkylene glycol-based lubricant, however, shows strongly reduced friction losses, which are about 25% smaller than for the 0W20 lubricant. As the 0W20 and the polyalkylene glycol-based lubricant have the same HTHS-viscosity , the findings contradict the common understanding that the HTHS-viscosity is the dominant driver related to the friction losses.

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“…Basically, the used simulation approach comprises an elastic multi-body simulation and describes the lubricant film isothermally using Reynolds' equation together with the Greenwood and Tripp approach to describe the metal-metal contact. Many important aspects of the method have been discussed in detail in previous works, so only a short summary is reproduced here for brevity: in particular the role of the piezoviscous effect and the Non-Newtonian behaviour of the lubricant and their consideration in the method [6,12], the thermal processes in the journal bearing and the developed equivalent bearing temperature relation that describes them suitably [6,13]. The method was put to test in direct comparison to experimental data in two different works [4,6] for different speeds, loads and lubricant classes.…”

Section: Determining the Friction Loss Of The Journal Bearingsmentioning

confidence: 99%

“…For the chosen isothermal methodology, the definition of a single temperature is necessary that represents a suitable compromise for the entire journal bearing. To this task the thermal processes and heat flows have been investigated in detail [13] and a so called equivalent temperature was developed that describes the journal bearing suitably [6,13]. This equivalent temperature is calculated from the measured temperatures (oil supply temperature, main bearing temperature) using following relations [6,13] …”

Section: Determining the Friction Loss Of The Journal Bearingsmentioning

confidence: 99%

Analysis of the Journal Bearing Friction Losses in a Heavy-Duty Diesel Engine

et al. 2015

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Internal combustion engines (ICE) for the use in heavy-duty trucks and buses have to fulfil demanding requirements for both vehicle efficiency as well as for emission of greenhouse gases. Beside the piston assembly the journal bearings are among the largest contributors to friction in the ICE. Through a combination of measurements and validated simulation methods the journal bearing friction losses of a state-of-the-art heavy-duty Diesel engine are investigated for a large range of real world operating conditions. To this task recently developed and extensively validated simulation methods are used together with realistic lubricant models that consider the Non-Newtonian behaviour as well as the piezoviscous effect. In addition, the potential for further friction reduction with the use of ultra-low viscosity lubricants is explored. The results reveal a potential of about 8% friction reduction in the journal bearings using a 0W20 ultra-low viscosity oil with an HTHS-viscosity (The HTHS-viscosity is defined as the dynamic viscosity of the lubricant measured at 150• C and at a shear rate of 10 6 s −1 ) of 3.6 mPa s. For the investigated engine, HTHS-viscosity limitations are determined which indicate that the use of lubricants with further reduced HTHS-viscosity would require engine and/or journal bearing modifications to be able to maintain the high service life of the engine.

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Predicting friction reliably and accurately in journal bearings—extending the EHD simulation model to TEHD

Cited by 45 publications

References 14 publications

Edge loading and running-in wear in dynamically loaded journal bearings

Edge loading and running-in wear in dynamically loaded journal bearings

Friction Reduction Tested for a Downsized Diesel Engine with Low-Viscosity Lubricants Including a Novel Polyalkylene Glycol

Analysis of the Journal Bearing Friction Losses in a Heavy-Duty Diesel Engine

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