Improving Tribological Performance of Piston Rings by Partial Surface Texturing

2005 ◽  
Vol 127 (3) ◽  
pp. 632-638 ◽  
Author(s):  
Y. Kligerman ◽  
I. Etsion ◽  
A. Shinkarenko
Keyword(s):  
Piston Ring ◽  
Surface Texturing ◽  
Hydrodynamic Pressure ◽  
Cylinder Liner ◽  
Time Dependent ◽  
Laser Surface Texturing ◽  
Shear Stresses ◽  
Time Behavior ◽  
Viscous Fluid Film ◽  
Potential Use

An analytical model is developed to study the potential use of partial laser surface texturing (LST) for reducing the friction between a piston ring and cylinder liner. The hydrodynamic pressure distribution and the time-dependent clearance between the piston ring and cylinder liner are obtained from a simultaneous solution of the Reynolds equation and the ring equation of motion in the radial direction. The time behavior of the friction force is calculated from the shear stresses in the viscous fluid film and the time-dependent clearance. An intensive parametric investigation is performed to identify the main parameters of the problem. The optimum LST parameters such as dimples depth, texture area density, and textured portion of the nominal contact surface of the piston ring are evaluated.

Effects of the array modes of laser-textured micro-dimples on the tribological performance of cylinder liner–piston ring

2017 ◽  
Vol 232 (7) ◽  
pp. 871-881 ◽  
Author(s):  
Bifeng Yin ◽  
Bo Xu ◽  
Hekun Jia ◽  
Huiqin Zhou ◽  
Yonghong Fu ◽  
...  
Keyword(s):  
Piston Ring ◽  
Gasoline Engine ◽  
Synergistic Effects ◽  
Surface Texturing ◽  
Cylinder Liner ◽  
Laser Surface Texturing ◽  
Micro Dimples ◽  
Square Array ◽  
Hydrodynamic Effects ◽  
Ring Pair

A mixed lubrication model of textured cylinder liner–piston ring was built to investigate the effects of four array modes namely, square array, stagger array, stretching, and shortening along liner axis array of micro-dimples on the tribological properties of cylinder liner–piston ring pair. The simulation results indicate that micro-dimples can enhance the hydrodynamic effects of lube oil, improving the film bearing capability. However, the effects differ significantly under the four dimple array modes: for square array, the cylinder liner–piston ring pair is well lubricated due to the synergistic effects of uniformly spaced micro-dimples that form homogeneous bearing film even around the fired top dead center where the lubrication condition is harsh; while the film of stagger array is the thinnest among the four schemes, which means its lubrication is also the worst. From square array mode, to shortening and stretching along liner axis array, then to stagger array mode, the total friction force of cylinder liner–piston ring shows an upward trend. By utilizing laser surface texturing method, square array, stretching along liner axis array, and stagger array of micro-dimples were textured on the gasoline engine cylinder bores, followed by a set of engine bench tests. The experimental results demonstrate that the engine motored torque of the three array modes increases in turns, which validates that the anti-friction effect of square array is optimal whereas that of stagger array is the most inefficient.

scholarly journals Fast laser surface texturing of spherical samples to improve the frictional performance of elasto-hydrodynamic lubricated contacts

Friction ◽  
2021 ◽  
Author(s):  
G. Boidi ◽  
P. G. Grützmacher ◽  
A. Kadiric ◽  
F. J. Profito ◽  
I. F. Machado ◽  
...  
Keyword(s):  
Surface Texturing ◽  
Hydrodynamic Pressure ◽  
Friction Reduction ◽  
Laser Surface Texturing ◽  
Textured Surfaces ◽  
Engineering Applications ◽  
Lubricated Contacts ◽  
Fluid Uptake ◽  
Direct Laser ◽  
Frictional Performance

AbstractTextured surfaces offer the potential to promote friction and wear reduction by increasing the hydrodynamic pressure, fluid uptake, or acting as oil or debris reservoirs. However, texturing techniques often require additional manufacturing steps and costs, thus frequently being not economically feasible for real engineering applications. This experimental study aims at applying a fast laser texturing technique on curved surfaces for obtaining superior tribological performances. A femtosecond pulsed laser (Ti:Sapphire) and direct laser interference patterning (with a solid-state Nd:YAG laser) were used for manufacturing dimple and groove patterns on curved steel surfaces (ball samples). Tribological tests were carried out under elasto-hydrodynamic lubricated contact conditions varying slide-roll ratio using a ball-on-disk configuration. Furthermore, a specific interferometry technique for rough surfaces was used to measure the film thickness of smooth and textured surfaces. Smooth steel samples were used to obtain data for the reference surface. The results showed that dimples promoted friction reduction (up to 20%) compared to the reference smooth specimens, whereas grooves generally caused less beneficial or detrimental effects. In addition, dimples promoted the formation of full film lubrication conditions at lower speeds. This study demonstrates how fast texturing techniques could potentially be used for improving the tribological performance of bearings as well as other mechanical components utilised in several engineering applications.

Simulation and Experimental Investigation on Friction Reduction by Partial Laser Surface Texturing on Piston Ring

2020 ◽  
Vol 63 (2) ◽  
pp. 371-381
Author(s):  
Xingyu Liang ◽  
Xiaohui Wang ◽  
Yin Liu ◽  
Xu Wang ◽  
Gequn Shu ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Piston Ring ◽  
Surface Texturing ◽  
Laser Surface ◽  
Friction Reduction ◽  
Laser Surface Texturing

Research on Tribological Performance of Cylinder Liner by Micro-Laser Surface Texturing

2011 ◽  
Vol 4 (4) ◽  
pp. 1318-1324 ◽  
Author(s):  
Yin Bifeng ◽  
Li Xiaodong ◽  
Fu Yonghong ◽  
Wang Yun
Keyword(s):  
Surface Texturing ◽  
Cylinder Liner ◽  
Tribological Performance ◽  
Laser Surface ◽  
Laser Surface Texturing

Research on Structure and Control System of Laser Surface Texturing Machine

2010 ◽  
Vol 43 ◽  
pp. 610-613
Author(s):  
Pei Yun Zhang ◽  
Mu Ju Wang ◽  
Yue Jin ◽  
Xi Jun Hua ◽  
Yong Hong Fu ◽  
...  
Keyword(s):  
Surface Texturing ◽  
Cylinder Liner ◽  
Single Pulse ◽  
Head Rotation ◽  
Structure Design ◽  
Laser Surface Texturing ◽  
Pulse Interval ◽  
Laser Head ◽  
Control Principle ◽  
And Control

Existing laser honing machines all utilize the motion mode of workpiece movement. But as to complex workpiece, this mode is inappropriate to use. For example, cylinder liner, pre-casted into the engine block, is not suitable to rotate when fixed on the chuck, because the block is irregular and heavy. This equipment uses the mode of laser head rotation and linear motion. The workpiece keeps still during the laser texturing process. In this paper, the structure design and control principle of the laser machine are narrated in detail. The process of the machine is a new method of laser micro-texturing, named as “single-pulse interval of the same point many times”. The method contributes to processing microscopic or macroscopic morphology and significantly reduces the negative thermal effects of laser processing

scholarly journals FRICTIONAL POWER MINIMIZATION IN PARTIALLY TEXTURED PISTON RING ASSEMBLY

2013 ◽  
pp. 132-136
Author(s):  
AARON. M. ASHWIN ◽  
AKASH SASHIDHAR
Keyword(s):  
Piston Ring ◽  
Surface Texturing ◽  
Laser Surface Texturing ◽  
Total Power ◽  
Exhaust Pipe ◽  
Power Losses ◽  
Automotive Engine ◽  
Frictional Losses ◽  
Ring Assembly ◽  
Brake Power

A significant share i.e. 60% of the total power loss in a modern automotive engine in form of heat, either from the engine surface or the exhaust pipe, of which the friction losses may vary from 18% to 20% and frictional losses are also responsible for about 25% of the fuel consumption. It is noted that almost 80% of the frictional losses are due to the frictional losses in the piston ring assembly (PRA). That leaves less than one quarter of the indicated power in terms of brake power. This paper analyses different methods developed by the automobile industries in order to reduce the friction power losses it may be in form of the development of better lubricants, design and partial laser surface texturing (LST) of the piston rings.

Numerical Analysis and Experimental Evaluation of Cylinder Liner Macro-Scale Surface Texturing

2015 ◽  
Author(s):  
Renlian Ma ◽  
Salaheldin A. Mohamad ◽  
Xiqun Lu ◽  
Wanyou Li
Keyword(s):  
Numerical Model ◽  
Piston Ring ◽  
Theoretical Study ◽  
Surface Texturing ◽  
Cylinder Liner ◽  
Model Match ◽  
Macro Scale ◽  
Cylinder Liners ◽  
Scale Surface ◽  
Effect Of Surface

An experimental and theoretical study is presented to study the effect of surface texturing in the form of circumferential oil grooves on improving the tribological properties of piston ring-cylinder liner tribosystem. Tests were performed on a reciprocating test rig with actual piston rings and cylinder liner segments, and a numerical model has been developed. A comparison was made between the performance of the textured cylinder liners and un-textured cylinder liners. It was found that with the smaller oil groove area density, the reduction in friction force is more obvious, Parabolic and triangular oil grooves are more efficient in friction reducing, and the prediction results by numerical model match the experimental results well in most case.

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