Compression piston rings in gasoline and diesel engines

MTZ worldwide ◽  
2005 ◽  
Vol 66 (7-8) ◽  
pp. 20-23 ◽  
Author(s):  
Johannes Esser ◽  
Steffen Hoppe ◽  
Rudolf Linde ◽  
Frank Münchow
Keyword(s):  
Diesel Engines ◽  
Piston Rings

Study on Wear of Piston Rings in Diesel Engines With Exhaust Gas Recirculation

2001 ◽  
Author(s):  
Tokuro Sato ◽  
Hideki Saito ◽  
Koji Korematsu ◽  
Junya Tanaka
Keyword(s):  
Diesel Engines ◽  
Time History ◽  
Acid Number ◽  
Engine Oil ◽  
Lubricating Oil ◽  
Base Number ◽  
Piston Rings ◽  
Total Acid ◽  
Residual Content ◽  
Measured Time

Abstract The wear of piston rings in the diesel engines with EGR system is studied experimentally. In order to clarify the effect of PM on the wear, the wear of the piston rings in the test engine is measured, (1) when the non-soluble in the lubricating oil is removed by the oil filters, (2) when PM in the re-circulating gas is removed by the DPF, (3) when the carbon black is added in the lubricating oil. The experimental results are discussed with the measured time history of kinematic viscosity, total base number, total acid number, ZDTP survival rate, and carbon residual content and its particle size in the engine oil.

The elastohydrodynamic lubrication of piston rings

1983 ◽  
Vol 386 (1791) ◽  
pp. 409-430 ◽  
Keyword(s):  
Film Thickness ◽  
Combustion Chamber ◽  
Diesel Engines ◽  
Elastohydrodynamic Lubrication ◽  
Cylinder Liner ◽  
Piston Rings ◽  
Lubrication Regimes ◽  
Piston Seal ◽  
Cylinder Liners ◽  
Lubricant Viscosity

The piston seal that separates the hostile environment of the combustion chamber from the crankcase that contains the lubricant is an essential machine element in reciprocating engines. The sealing force pressing the piston rings against the cylinder liner varies with the combustion chamber pressure to form an effective self-adjusting mechanism. The conjunctions between piston rings and cylinder liners are thus subjected to cyclic variations of load, entraining velocity and effective lubricant temperature as the piston reciprocates within the cylinder. Recent theoretical and experimental studies have confirmed that piston rings enjoy hydrodynamic lubrication throughout most of the engine cycle, but that a transition to mixed or boundary lubrication can be expected near top dead centre. The purpose of the present paper is to examine the suggestion that elastohydrodynamic lubrication might contribute to the tribological performance of the piston seal, particularly near top dead centre. The mode of lubrication in eight four-stroke and six two-stroke diesel engines is assessed in terms of the dimensionless viscosity and elasticity parameters proposed by Johnson (1970), and the associated map of lubrication régimes. The survey indicates unequivocally that elastohydrodynamic action can be expected during part of the stroke in all the engines considered. In the second part of the paper a detailed examination of the influence of elastohydrodynamic action in one particular engine is presented to confirm the general findings recorded in the study of lubrication régimes. Current analysis of the lubrication of rigid piston rings already takes account of the variation of surface temperature along the cylinder liner and its influence upon lubricant viscosity. It is shown that, when the enhancing influence of pressure upon viscosity is added to the analysis of rigid piston rings, the predicted cyclic minimum film thickness is more than doubled. Full elastohydrodynamic action, involving both local distortion of the elastic solids and the influence of pressure upon viscosity, results in a fourfold increase in film thickness. It is further shown that it is necessary to take account of the variation of squeeze-film velocity throughout the lubricated conjunction at each crank angle if reliable predictions of film shape and thickness are to be achieved. It is thus concluded that the wave of elastic deformation, which ripples up and down the cylinder liners many times each second in diesel engines, together with the associated local elastic deformations on the piston rings themselves, combine with the influence of pressure upon lubricant viscosity to enhance the minimum oil film thickness in the piston seal by elastohydrodynamic action.

Transient Heat Transfer of Piston/Rings/Liner System in Diesel Engines

2005 ◽  
Author(s):  
Daxi Xiong ◽  
Tian Tian ◽  
Victor Wong
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Transfer Process ◽  
Diesel Engines ◽  
Frictional Heating ◽  
Heat Transfer Process ◽  
Transient Heat Transfer ◽  
Transient Temperature ◽  
Piston Rings ◽  
Liner System

In diesel engines, transient heat transfer in the piston/rings/liner system greatly affects the performance of the engine, such as in carbon deposit buildup, microwelding, lubricant degradation, and changing mechanical properties of the materials. The current work aims at studying the local piston/rings/liner transient heat-transfer process by incorporating real time dynamics of the rings in sufficient detail. In the present study, several techniques have been adopted to simulate the transient heat transfer process, with fully-incorporated ring dynamics. These techniques include using the model/submodel approach, local refined mesh approach, and the virtual thermal conductivity approach. The transient temperature and heat flux profiles in the piston and rings are illustrated. The results show that the relative movement of the rings greatly affects the temperature/heat flux distribution and the peak temperature in the top ring. The friction heating between the top ring and the liner is also evaluated. The analysis demonstrates that under some extreme conditions when frictional heating reaches its peak value, some heat flux directs back to enter the ring.

scholarly journals Material evolution in critical parts of marine low speed engines

2015 ◽  
Vol 2015 (4) ◽  
pp. 65-72
Author(s):  
Владимир Рогалев ◽  
Vladimir Rogalev ◽  
Олег Чернявский ◽  
Oleg Chernyavskiy
Keyword(s):  
Cast Iron ◽  
Diesel Engine ◽  
Diesel Engines ◽  
Alloying Elements ◽  
Effective Pressure ◽  
Piston Rings ◽  
Engineering Plant ◽  
Low Speed ◽  
Material Chemistry ◽  
Materials Used

With the growth of average effective pressure in cylinders of marine lowspeed diesel engines the requirements increased to materials used for manufacturing their critical parts. This paper reports the dynamics of mechanical data changes in materials (steel and cast iron) of critical parts in diesel engines by the example of produce of the Bryansk engineering plant. From 1961 till 2008 the Bryansk engineering plant is the only manufacturer of powerful marine low-speed diesel engines in Russia. Diesel engines were being built under licence of “MAN Burmeister Diesel” Co. Diesel engines manufactures in different years differ with forcing degree. A diesel engine with a higher forcing degree has a higher value of mean effective pressure. In the paper there are shown types of diesel engines manufactured by the Bryansk engineering plant and is shown the evolution of mechanical data of cylinder iron bushes, piston rings, steel components of a bed frame, crankshafts. It is pointed out that the application of new steel and cast iron kinds should follow considerable changes in the design of marine low-speed diesel engines of the type 6DKRN 50/200-14 of compact modification. The conclusion is drawn of that with the growth of a forcing degree in diesel engines the mechanical data of steel and cast iron will increase at the expense of material chemistry changes by means of the introduction of alloying elements and application of modern metallurgical equipment for qualitative billet manufacturing.

scholarly journals Oil Film Formation between Piston Rings and Cylinder Liner of Slow-Speed Marine Diesel Engines

1994 ◽  
Vol 29 (3) ◽  
pp. 261-267
Author(s):  
Keijiro Tayama ◽  
Kazuhiko Maekawa ◽  
Keizo Gotoh ◽  
Noriyasu Inenaga
Keyword(s):  
Diesel Engines ◽  
Film Formation ◽  
Cylinder Liner ◽  
Slow Speed ◽  
Piston Rings ◽  
Oil Film ◽  
Marine Diesel

scholarly journals Piston Rings and Cylinder Liners of Mitsubishi UE Diesel Engines

2009 ◽  
Vol 44 (2) ◽  
pp. 239-246
Author(s):  
Yuji WAKATSUKI ◽  
Tomokatsu YAMAMOTO
Keyword(s):  
Diesel Engines ◽  
Piston Rings ◽  
Cylinder Liners

OPERATIONAL EVALUATION OF PISTON-RINGS-CYLINDER LINER ASSEMBLY WEAR IN HIGH POWER MARINE DIESEL ENGINES

Tribologia ◽  
2018 ◽  
Vol 271 (1) ◽  
pp. 5-15
Author(s):  
Adam ADAMKIEWICZ ◽  
Jan DRZEWIENIECKI
Keyword(s):  
High Power ◽  
Diesel Engines ◽  
Piston Ring ◽  
Cylinder Liner ◽  
Technical Condition ◽  
Piston Rings ◽  
Protective Layers ◽  
Marine Diesel ◽  
Source Of Information ◽  
Operational Methods

This paper presents an operational evaluation of piston-piston rings-cylinder liner (PRC) assembly wear in marine diesel engines of high power. It is based on visual inspection through cylinder liner scavenge ports. Clearance measurements of piston rings in piston grooves and piston ring gap measurements were used to evaluate the extent of wear of the PRC assembly. Moreover, it is shown that piston ring gap measurements can be used as a reference parameter in wear trend analysis to predict the length of time periods between overhauls (TBO). Furthermore, it has been shown that controlling the wear of chromium (protective) layers of piston ring working surfaces by measuring their thickness with induction and eddy current methods is highly useful. They were accepted as a source of information on PRC lubrication correctness and as a symptom of its technical condition. Factors indicating the necessity of an overhaul and introducing operational methods of improving working conditions between the tribological pair – liner and piston rings have been determined.

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