Tribocarbonisation of a synthetic engine oil in lubricated piston ring/cylinder bore sliding contact and its relation to friction and wear

2003 ◽  
Vol 20 (3) ◽  
pp. 203-215 ◽  
Author(s):  
S. H. Li ◽  
R. J. Zhang ◽  
Y. S. Jin ◽  
Y. C. Wang ◽  
S. C. Tung
Keyword(s):  
Friction And Wear ◽  
Piston Ring ◽  
Sliding Contact ◽  
Engine Oil ◽  
Cylinder Bore

Three Dimensional Ring Dynamics Modeling Approach for Analyzing Lubrication, Friction and Wear of Piston Ring-Pack

2017 ◽  
Author(s):  
K. G. Mahmoud ◽  
O. Knaus ◽  
T. Parikyan ◽  
M. Patete
Keyword(s):  
Friction And Wear ◽  
Piston Ring ◽  
Parameter Analysis ◽  
Engine Oil ◽  
Oil Consumption ◽  
Modeling Approach ◽  
Power Cylinder ◽  
Piston Ring Pack ◽  
Ring Pack ◽  
Cylinder Bore

The automotive industry is subjected to increasing pressure in order to improve fuel efficiency and reduce the CO2 emissions of internal combustion (IC) engines. The power cylinder system (piston, piston ring, and liner) contributes significantly to the friction losses, engine oil consumption and gas leakage called blow-by. The role of cylinder bore shape in engine performance has been the subject of several studies in recent years. High bore distortion must be avoided because it can lead to ring conformability issues, which leads to inadequate sealing resulting in increased blow-by and oil consumption. It also leads to asperity contact between the piston skirt and cylinder bore increasing friction causing abnormally high surface wear. Although bore distortion cannot be eliminated, engine manufacturers strive to contain it within acceptable limits. Therefore, numerical analysis of the power cylinder with physically based mathematical models becomes very essential to the engine and component manufacturer in order to reduce engine development lead time and minimize the number of engine tests. The integrated ring-pack modeling methodology developed by the authors [1] is used to investigate the piston ring-pack performance. Although the modeling approach can be used for extensive parameter analysis of piston, piston rings and lubrication oil consumption, the influence of the bore distortion on the ring conformability and its impact on blow-by, friction and wear is highlighted in this study. Piston tilting, piston ring twist and surface roughness of the piston ring and liner have been taken into consideration.

Study on the Abrasive Wear of Chromeplate Piston Ring and Cylinder Jacket Made by Different Materials

2012 ◽  
Vol 591-593 ◽  
pp. 927-930
Author(s):  
Wen Wei Gao ◽  
Zhi Zheng ◽  
Jian Ming Yang ◽  
Ya Qin An
Keyword(s):  
Abrasive Wear ◽  
Quartz Sand ◽  
Friction And Wear ◽  
Piston Ring ◽  
Positive Influence ◽  
Piston Rings ◽  
Cylinder Bore ◽  
Great Damage ◽  
Abrasive Ability

The abrasion of piston rings/tribomate pairs of cylinder jacket has great damage to engine, which can shorten the life of piston rings and cylinder bore, decrease the power of engine, enlarge the amount of oil, and release more pollution. Take a research of abrasive wear of piston ring and cylinder jacket made by different materials, will create a positive influence on extending the life of engine. This paper takes the SRV friction and wear tester, conducts the research on the abrasive ability of the three tribomate pairs (Cr plated piston ring and P-B, Cu-Cr-Ni-Mo and bainite cylinder bores) under the condition that there lies a certain amount of quartz sand in the lubricant and find that the hardness, intensity and tenacity of tribomate materials can have influence on its capability of resisting abrasion.

Numerical Investigation of the Effects of Axial Cylinder Bore Profiles on Piston Ring Radial Dynamics

2003 ◽  
Vol 125 (4) ◽  
pp. 1081-1089 ◽  
Author(s):  
Y. Piao ◽  
S. D. Gulwadi
Keyword(s):  
High Speed ◽  
Piston Ring ◽  
Gasoline Engine ◽  
Engine Performance ◽  
Operating Conditions ◽  
Engine Oil ◽  
Oil Consumption ◽  
Ring Pack ◽  
Cylinder Bore

The role of cylinder bore shapes in engine performance has been the subject of several studies in recent years. In particular, the influence of bore distortion on oil consumption under high speed conditions has generated significant interest. In this paper, the effect of an axial bore profile on radial dynamics of a ring is investigated. Radial ring motions within grooves due to the axial bore profile can generate significant inertial effects and also have an impact on ring end-gap sizes and lubrication conditions at the ring-liner interfaces. The magnitude of such effects is dependent on the ring-pack configuration, engine operating conditions (speed and load) and axial bore profile details. These issues are investigated in this study due to their implication on engine oil consumption, friction and blow-by. The authors have developed an analytical expression to account for the effects of radial ring inertia due to an axial bore profile for implementation in a piston ring-pack simulation tool RINGPAK. Simulation results from a gasoline engine study are presented to illustrate the effects of engine speeds, ring tensions, and characteristics of axial bore profiles on ring radial dynamics and ring-liner lubrication. Relevant qualitative comparisons are made to experimental measurements available in the literature.

Numerical Investigation of the Effects of Axial Cylinder Bore Profiles on Piston Ring Radial Dynamics

2002 ◽  
Author(s):  
Y. Piao ◽  
S. D. Gulwadi
Keyword(s):  
High Speed ◽  
Piston Ring ◽  
Gasoline Engine ◽  
Engine Performance ◽  
Operating Conditions ◽  
Engine Oil ◽  
Oil Consumption ◽  
Ring Pack ◽  
Cylinder Bore

The role of cylinder bore shapes in engine performance has been the subject of several studies in recent years. In particular, the influence of bore distortion on oil consumption under high speed conditions has generated significant interest. In this paper, the effect of an axial bore profile on radial dynamics of a ring is investigated. Radial ring motions within grooves due to the axial bore profile can generate significant inertial effects and also have an impact on ring end-gap sizes and lubrication conditions at the ring-liner interfaces. The magnitude of such effects is dependent on the ring-pack configuration, engine operating conditions (speed and load) and axial bore profile details. These issues are investigated in this study due to their implication on engine oil consumption, friction and blow-by. The authors have developed an analytical expression to account for the effects of radial ring inertia due to an axial bore profile for implementation in a piston ring–pack simulation tool RINGPAK. Simulation results from a gasoline engine study are presented to illustrate the effects of engine speeds, ring tensions and characteristics of axial bore profiles on ring radial dynamics and ring-liner lubrication. Relevant qualitative comparisons are made to experimental measurements available in the literature.

Effect of Cylinder Bore Out-of-Roundness on Piston Ring Rotation and Engine Oil Consumption

1993 ◽  
Author(s):  
Eric W. Schneider ◽  
Daniel H. Blossfeld ◽  
Donald C. Lechman ◽  
Robert F. Hill ◽  
Richard F. Reising ◽  
...  
Keyword(s):  
Piston Ring ◽  
Engine Oil ◽  
Oil Consumption ◽  
Ring Rotation ◽  
Cylinder Bore

Tribological Properties of New Developed Nano Boric Acid Suspended as Additive in Engine Oil

2019 ◽  
Vol 823 ◽  
pp. 41-52
Author(s):  
Hakan Kaleli̇ ◽  
Selman Demi̇rtaş ◽  
Veli Uysal ◽  
Zulhicce Tanriseven
Keyword(s):  
Boric Acid ◽  
Photoelectron Spectroscopy ◽  
Friction And Wear ◽  
Piston Ring ◽  
Cylinder Liner ◽  
Engine Oil ◽  
Lubricating Oil ◽  
Chemical Compositions ◽  
X Ray ◽  
Liner System

It is well known that nanoparticles affect the interaction between lubricants and surfaces with various chemical compositions and different chemical and physical properties. In recent years, nanoparticles have started to play more important roles as lubricant additives for their potential in wear, friction and emission reduction and improving lubrication and fuel economy. Although nanolubricants are frequently used for friction tests, little is known about stability and degree of dispersion of these nanoparticles in viscous liquids. Most of them are unstable, agglomerate or aggregate which sediment over time. Boric acid (H3BO3) has always been a very important material due to its broad range of applications such as in medicine, cosmetics, automotive industry, metallurgy and also for miscellaneous purposes in other areas. Literature survey showed that friction between automobile engine parts could be greatly reduced using microscopic particles of boric acid.This study involves the new invention of successful suspension of nano boric acid (BA) additive added into 5W-40 fully synthetic commercial lubricating oil. This invention is confidential and realized by Murat ÖZAYMAN from Tribor ARGE Co. in Teknopark of YILDIZ Technical University in Istanbul-TURKEY. The particle size of BA is determined with (Transmission Electron Microscopy) (TEM). Backscattering and transmittance profiles proved that nano boric acid (BA) particles were in suspension in commercial engine oil. Suspended BA in engine oil is applied between piston ring and cylinder liner system in order to investigate their effect on friction and wear under boundary lubricated conditions. Simulation and measurement of friction and wear were conducted using a reciprocating tribometer. Surface analysis were performed using 3D digital optical microscope, Field Emission Scanning Electron Microscope (FESEM)/X-Ray, X-ray photoelectron spectroscopy (XPS) and Atomic Force Microscopy (AFM). Boron (B) from BA is well detected, mixed with other elements of additives and protected the surface under boundary lubrication conditions. The results indicate that BA can considerably improve the tribological performance of a piston ring and cylinder liner system under lubricated conditions. It has found that the friction coefficient is reduced with nano boric acid (BA) suspended engine oil and protected the surface mostly on cylinder liner mixing with other additives.

Study on the Abrasive Wear of Ceramic Piston Rings and the Different Cylinder Bore

2013 ◽  
Vol 477-478 ◽  
pp. 1385-1388
Author(s):  
Wen Wei Gao ◽  
Zhi Zheng ◽  
Ya Qin An ◽  
Song Bai He
Keyword(s):  
Abrasive Wear ◽  
Quartz Sand ◽  
Friction And Wear ◽  
Piston Ring ◽  
Piston Rings ◽  
Cylinder Bore ◽  
Abrasive Ability

The paper takes the SRV friction and wear tester, conducts the research on the abrasive ability of the three tribomate pairs (ceramic piston ring and P-B, Cu-Cr-Ni-Mo and bainite cylinder bores) under the condition that there lies a certain amount of quartz sand in the lubricant and find that the more hardness of cylinder bores, the more capability of resisting abrasion. The capability of resisting abrasion of ceramic piston ring/bainite cylinder bores is the best in three tribomate pairs.

Study on the Abrasive Wear of Mo-Alloy Sprayed Piston Ring

2014 ◽  
Vol 1052 ◽  
pp. 524-528
Author(s):  
Wen Wei Gao ◽  
Zhi Zheng ◽  
Ya Jun Wang
Keyword(s):  
Abrasive Wear ◽  
Surface Structure ◽  
Quartz Sand ◽  
Friction And Wear ◽  
Piston Ring ◽  
Chemical Component ◽  
Cylinder Bore

This paper takes the SRV friction and wear tester, conducts the research on the abrasive principle of the tribomate pairs (Mo-alloy sprayed piston ring/P-B cylinder bore) under the condition that there lies a certain amount of quartz sand in the lubricant and find that the surface structure, chemical component of tribomate materials can have a huge influence on its capability of resisting abrasion.

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