Research on the Effect of Whole Cylinder Block on EHL Performance of Main Bearings Considering Crankshaft Deformation for Internal Combustion Engine

2010 ◽  
Vol 132 (4) ◽  
Author(s):  
Jun Sun ◽  
Xiaoxia Cai ◽  
Liping Liu
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Frictional Coefficient ◽  
Elastohydrodynamic Lubrication ◽  
Internal Combustion ◽  
Cylinder Block ◽  
Bearing Surface ◽  
Main Bearing ◽  
Compliance Matrix ◽  
Working Cycle

In this paper, the analyses of elastohydrodynamic lubrication (EHL) of crankshaft bearings considering the deformation of the whole cylinder block and crankshaft under load were carried out for the crankshaft bearing system of a four-stroke four-cylinder internal combustion engine. The lubrication of crankshaft bearing was analyzed by dynamic method. The deformation of bearing surface under pressure of oil film was calculated by compliance matrix method. The results show that when the crankshaft deformation under load is considered, compared with the results of not considering the deformation of cylinder block, the maximum film pressure decreases, the minimum film thickness increases, and the end leakage flow-rate and frictional coefficient of journal surface change little in an engine working cycle when considering the deformation of cylinder block. The models of the whole cylinder block and the single main bearing housing were used, respectively, to calculate the deformation of main bearing surface in the analyses. The results show that the calculation accuracy of the elastohydrodynamic lubrication analyses of crankshaft main bearings can be met basically by applying the simple model based on the single main bearing housing to calculate the elastic deformation of main bearing surface.

Application of precision chronometric technologies for monitoring deviations in the internal combustion engine operation

2021 ◽  
Author(s):  
E.T. Plaksina ◽  
A.B. Syritsky ◽  
A.S. Komshin
Keyword(s):  
Internal Combustion Engine ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Internal Combustion ◽  
The Arctic ◽  
Diagnostic Systems ◽  
Time Intervals ◽  
Angle Sensor ◽  
Engine Operation ◽  
Working Cycle

The article considers the main methods of internal combustion engine diagnostics. A method based on measuring the time intervals between the phases of the working cycle of the mechanism is described. An algorithm for measuring the time intervals from the formulation of the problem to the proof of the efficiency of this method on an internal combustion engine has been determined. The installation of the angle sensor on the crankshaft of the experimental bench engine VAZ 21126 is shown. The basis for the construction of a mathematical model of the crankshaft is presented and the main factors influencing its movement are identified. A criterion has been established according to which the misfire is determined most accurately. The results obtained can be used for developing diagnostic systems for internal combustion engines, as well as engines operating in extreme conditions, for example, beyond the Arctic Circle, on ships, etc.

The Effect of Piston Skirt Profile on EHD Lubrication in an Internal Combustion Engine

2013 ◽  
Vol 787 ◽  
pp. 704-710 ◽  
Author(s):  
Kellaci Ahmed ◽  
Khelidj Benyoucef ◽  
Mazouzi Redha ◽  
Lounis Mourad
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Three Dimensional ◽  
Elastohydrodynamic Lubrication ◽  
Elastic Equilibrium ◽  
Internal Combustion ◽  
Lubricant Film ◽  
Piston Skirt ◽  
Ehd Lubrication ◽  
Finite Differences Method

This investigation is concerned with the elastohydrodynamic lubrication of the piston skirt / cylinder link of an internal combustion engine. In such compliant structures, the thickness of the lubricant film depends not only on the elastic deformation elements of the mechanism but also on their profiles. We have developed a computer program to study the effect of the profile of the piston skirt on the lubricant film. This program is based on a two-dimensional description of the lubricant film flow and a three-dimensional deformation of solids. The Reynolds equation defines the behavior of hydrodynamic film of oil in the liaison piston skirt / cylinder, and the equations of static and elastic equilibrium quantify the behavior of the structure. These Equations are solved numerically by using the finite differences method.

Probabilistic Main Bearing Performance for an Internal Combustion Engine

2005 ◽  
Vol 127 (4) ◽  
pp. 784 ◽  
Author(s):  
Zissimos P. Mourelatos ◽  
Nickolas Vlahopoulos ◽  
Omidreza Ebrat ◽  
Jinghong Liang ◽  
Jin Wang
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Main Bearing

Preliminary Study on Tribological Performance of Straw Based Bio-Fuel

2007 ◽  
Author(s):  
Yufu Xu ◽  
Qiongjie Wang ◽  
Xianguo Hu ◽  
Jinsi Chen
Keyword(s):  
Internal Combustion Engine ◽  
Alternative Fuels ◽  
Combustion Engine ◽  
Frictional Coefficient ◽  
Internal Combustion ◽  
Alternative Fuel ◽  
Diesel Oil ◽  
Chemical Compositions ◽  
Extreme Pressure ◽  
Ball Surface

More and more attention has been paid to alternative fuel in internal combustion engine. One of alternative fuels is to convert straw biomass to biomass fuel. Various methods and apparatuses used for converting straw biomass to bio-fuel were invented and developed. However, alternative fuel from biomass can not be used well in internal combustion engine. The reason is complicated and relative with the separation technology of bio-fuel and corrosion, wear, lubrication and combustion chemical reaction between bio-fuel and the surface of combustion room. It is necessary to study the tribological properties of bio-fuel in order to instead the current gasoline or diesel oil in internal combustion engine in the future. In the present study, the straw based bio-oil obtained by liquidizing process was chosen to evaluate its lubrication by MQ-800 fourball tribometer, in which extreme pressure and friction coefficient and wear resistance were measured respectively. The experimental results showed that the extreme pressure of the bio-fuel was up to 392 N, and the extreme pressure of diesel oil was 333 N. The frictional coefficient of bio-fuel varies between 0.08 and 0.11. The wear scar diameter increased with load slowly in 30min. SEM images indicate that lots of thin and dense belt-like ploughs were presented on the rubbed ball surface. The chemical compositions of the worn zone on the ball surface were analyzed by XPS, the thermal property and variation of chemical compositions of bio-fuel before and after friction and wear tests were studied by TGA and GC-MS, respectively. It was shown that the rubbing surface film was composed of FeS, FeSO4 and organic compounds with C-C, −COH and −COOH groups.

DEFECTIVE CYLINDER BLOCK OF INTERNAL COMBUSTION ENGINES

2021 ◽  
Vol 1 (27) ◽  
pp. 37-43
Author(s):  
A. V. Summanen ◽  
Keyword(s):  
Internal Combustion Engine ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Technical Condition ◽  
Cylinder Block ◽  
Combustion Engines ◽  
Measurement Scheme ◽  
Inner Diameter

This article discusses the issues of assessing the technical condition of the cylinder block. The necessary parameters for assessing the technical condition of the cylinder block have been determined. How and how to measure and calculate this or that parameter is presented in detail. Methods for calculating the parameters are presented. A measurement scheme and a technique for constructing a wear diagram of the inner diameter of a cylinder are proposed in order to visually assess the wear and its appearance. The method for calculating the repair size is presented. The questions of the influence of these parameters on the operability of the cylinder block and the internal combustion engine as a whole are considered.

Thermo-Elastohydrodynamic Analysis of Connecting Rod Bearing in Internal Combustion Engine

2001 ◽  
Vol 123 (3) ◽  
pp. 444-454 ◽  
Author(s):  
Byung-Jik Kim ◽  
Kyung-Woong Kim
Keyword(s):  
Internal Combustion Engine ◽  
Elastic Deformation ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Variable Viscosity ◽  
Elastohydrodynamic Lubrication ◽  
Internal Combustion ◽  
Thermal Distortion ◽  
Connecting Rod ◽  
Lubrication Film

A comprehensive method of thermo-elastohydrodynamic lubrication analysis for connecting rod bearings is proposed, which includes thermal distortion as well as elastic deformation of the bearing surface. Lubrication film temperature is treated as a time-dependent, two-dimensional variable which is averaged over the film thickness, while the bearing temperature is assumed to be time-independent and three-dimensional. It is assumed that a portion of the heat generated by viscous dissipation in the lubrication film is absorbed by the film itself, and the remainder flows into the bearing structure. Mass-conserving cavitation algorithm is applied, and the effect of variable viscosity is included in the Reynolds equation. Simulation results of the connecting rod bearing of an internal combustion engine are presented. It is shown that the predicted level of the thermal distortion is as large as that of the elastic deformation and the bearing clearance, and that the thermal distortion has remarkable effects on the bearing performance. Therefore, the thermo-elastohydrodynamic lubrication analysis is strongly recommended to predict the performance of connecting rod bearings in internal combustion engines.

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