Tribology of the ring—bore conjunction subject to a mixed regime of lubrication

Mishra, Prakash Chandra; Rahnejat, Homer; King, Paul D.

doi:10.1243/09544062jmes1220

Cited by 62 publications

(120 citation statements)

References 19 publications

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“…470-517, ISBN: 978-1-84569-993-2 Considering n=2, equation (14.32) would result in a parabolic profile, which is usually employed to approximate the piston top ring profile with sufficient accuracy (Jeng, 1992and Baek et al, 2005, Mishra et al, 2009 and is also called the barrelshaped profile. In this case, the bearing surface profile may be written as follows (see An investigation into the optimisation of convex shaped bearing profiles shows that in the absence of a pressure difference between the bearing ends, n=2 is the optimum shape power for convex bearing families as described above.…”

Section: Application Of the Optimum Results In The Piston-ring/cylindmentioning

confidence: 99%

Optimised textured surfaces with application in piston ring/cylinder liner contact

Rahmani

Shirvani

2010

Tribology and Dynamics of Engine and Powertrain

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This item was submitted to Loughborough's Institutional Repository (https://dspace.lboro.ac.uk/) by the author and is made available under the following Creative Commons Licence conditions.For the full text of this licence, please go to: http://creativecommons.org/licenses/by-nc-nd/2.5/ In: Tribology and Dynamics of Engine and Powertrain: Fundamentals, Applications and Future Trends, Edited by H. Rahnejat, Woodhead Publishing, 2010, pp. 470-517, ISBN: 978-1-84569-993-2 Chapter 14 Optimised Textured Surfaces with Application in Piston-Ring/Cylinder Liner Contact R. RAHMANI, Loughborough University, UK A. SHIRVANI and H. SHIRVANI, Anglia Ruskin University, UK Abstract: The application of textured surfaces in tribology has recently gained a huge momentum. In this chapter, a systematic approach to investigate the maximum outcomes from employing such surfaces is introduced with an insight into their application in internal combustion engines. A combination of various affecting parameters on the tribological performance of such surfaces is studied and the optimum results were introduced. The effect of employing such optimised textures in enhancing the lubrication condition in piston ring/cylinder liner contact is also studied.Key words: surface texturing, piston ring/cylinder liner contact, optimisation, slider bearings IntroductionIn general, friction is inherent to and is produced between bodies in contact with relative motion. Friction tends to oppose this relative motion between the bodies through loss of energy mostly in the form of heat, mechanical vibration and noise. Therefore, in most cases, friction is an unfavourable phenomenon. In some cases introduction of friction is desired, for example in order to slow down a moving car, the brakes are used to reduce the existing kinetic energy in the wheels by means of producing frictional losses. However, in most of the cases, facilitating this relative motion between bodies is of concern and as a result, one needs to overcome friction so that the relative motion pursues with a minimal loss of energy.Excessive friction can cause damage to the surfaces in contact in several ways and as a result make them wear. Since the surfaces are damaged due to wear, the rate of energy dissipation due to friction increases and consequently amplifies the rate of wear itself (see Chapter 2).The reason for the existence of friction is mainly that in reality, there is no perfect smooth surface. In fact, surfaces have a degree of roughness in the form of small 'hills' and 'valleys' no matter how well they are prepared. When two surfaces, which are in contact with each other, are put into relative motion, the asperities on the In: Tribology and Dynamics of Engine and Powertrain: Fundamentals, Applications and Future Trends, Edited by H. Rahnejat, Woodhead Publishing, 2010, pp. 470-517, ISBN: 978-1-84569-993-2 opposing surfaces become locked hence inducing friction as initially proposed by Amontons for onset of motion and later under kinetic conditions by Coulomb (see Chapter 2). W...

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Section: Application Of the Optimum Results In The Piston-ring/cylindmentioning

confidence: 99%

Optimised textured surfaces with application in piston ring/cylinder liner contact

Rahmani

Shirvani

2010

Tribology and Dynamics of Engine and Powertrain

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“…They observed values of 0.4-2.5μm, which are more in line with expected values at TDC and BDC especially. Mishra et al [20] used Greenwood and Tripp's [21] method, together with measurements of a real out-of-round cylinder bore, to perform a tribological analysis of the compression ring-bore contact. Reasonable agreement was noted with the experimental data presented by Furuhama and Sasaki [22], as well as previous numerical analysis by Akalin and Newaz [23].…”

Section: Effect Of Compression Ring Elastodynamics Behaviour Upon Blomentioning

confidence: 99%

Effect of Compression Ring Elastodynamics Behaviour upon Blowby and Power Loss

Baker¹,

Rahmani²,

Karagiannis³

et al. 2014

SAE Technical Paper Series

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“…The remainder is accounted for with the sum of small inefficiencies within the system. Compression rings can be seen to be responsible for 4-5% of all losses in a standard 4-stroke internal combustion engine (Mishra et al, 2009). Clearly this is a significant proportion of all losses, especially for such a relatively small component.…”

Section: Introductionmentioning

confidence: 98%