Analysis of Cylinder Bore Distortion During Engine Operation

1995 ◽  
Author(s):  
Shizuo Abe ◽  
Makoto Suzuki
Keyword(s):  
Engine Operation ◽  
Cylinder Bore ◽  
Cylinder Bore Distortion

The Effect of Cylinder Bore Distortion on Lube Oil Consumption and Blow-By

2013 ◽  
Vol 136 (1) ◽  
Author(s):  
Fatih Kagnici ◽  
Ozgen Akalin
Keyword(s):  
Finite Element ◽  
Piston Ring ◽  
Fourier Coefficients ◽  
Cylinder Block ◽  
Lubricating Oil ◽  
Oil Consumption ◽  
Engine Operation ◽  
Consumption Model ◽  
Cylinder Bore ◽  
Cylinder Bore Distortion

It is well known that cylinder bore deformations during engine operation cause a number of problems in piston ring lubrication. Particularly, the deterioration of piston ring and cylinder bore conformability results in a significant increase in lubricating oil consumption. Therefore, measurement and identification of cylinder bore distortion has been an important subject for engine designers. In this study, an analytical lubricating oil consumption model was developed for a diesel engine. Piston stiffness was identified as an important input parameter for the oil consumption model, and the stiffness matrix of the piston was calculated using finite element simulations. In addition, finite element analysis was performed to determine the distorted cylinder block shape in engine running conditions. Pressure curves and loads obtained in actual engine tests were used in the analysis. The Fourier coefficients of a distorted cylinder bore was calculated which characterize the deformed bore orders. Using these Fourier coefficients, several distorted bore shapes were regenerated, including a straight bore and the effect of each order on total lube oil consumption was investigated by means of the oil consumption model.

The Effect of Cylinder Bore Distortion on Lube Oil Consumption and Blow-By

2012 ◽  
Author(s):  
Fatih Kagnici ◽  
Ozgen Akalin
Keyword(s):  
Finite Element ◽  
Piston Ring ◽  
Fourier Coefficients ◽  
Cylinder Block ◽  
Lubricating Oil ◽  
Oil Consumption ◽  
Engine Operation ◽  
Consumption Model ◽  
Cylinder Bore ◽  
Cylinder Bore Distortion

It is well-known that cylinder bore deformations during engine operation cause a number of problems in piston ring lubrication. Particularly, the deterioration of piston ring and cylinder bore conformability results in a significant increase in lubricating oil consumption (LOC). Therefore, measurement and identification of cylinder bore distortion has been an important subject for engine designers. In this study, an analytical lubricating oil consumption model was developed for a diesel engine. Piston stiffness was identified as an important input parameter for the oil consumption model, and the stiffness matrix of the piston was calculated using finite element simulations. In addition, finite element analysis was performed to determine the distorted cylinder block shape in engine running conditions. Pressure curves obtained in actual engine tests were used in the analysis. The Fourier coefficients of a distorted cylinder bore was calculated which characterize the deformed bore orders. Using these Fourier coefficients, several distorted bore shapes were regenerated, including a straight bore and the effect of each order on total lube oil consumption was investigated by means of the oil consumption model.

A Study on Cylinder Bore Deformation of a Diesel Engine With Dry Liner Structure

2001 ◽  
Author(s):  
Shigeto Yamamoto ◽  
Hiroshi Sakita ◽  
Masaaki Takiguchi ◽  
Shinichi Sasaki
Keyword(s):  
Thermal Expansion ◽  
Diesel Engine ◽  
Room Temperature ◽  
Engine Speed ◽  
Cylinder Liner ◽  
Cylinder Block ◽  
Cylinder Pressure ◽  
Engine Operation ◽  
Actual Operation ◽  
Cylinder Bore

Abstract The deformation of the cylinder liner of a diesel engine in actual operation have been measured by the means of a rotary piston, and the deformation has been compared with those measured statically at room temperature. As a result, it is found that the deformation of the liner in engine operation is hardly affected by the deformation at room temperature, but it follows the deformation of the cylinder block where the liner is inserted. It is also found as follows: The deformation of the liner upper portion varies according to the head bolts and the engine load, while the effect of the cylinder pressure is insignificant. The deformation at the middle of the liner changes mainly by the thermal expansion in the thrust direction, while the deformation at the lower portion is not affected by the engine speed or the load.

scholarly journals A Study Of Cylinder Bore Distortion In V6 Aluminum Alloy Engine Blocks

2021 ◽  
Author(s):  
Anthony Lombardi
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Gray Iron ◽  
Engine Block ◽  
Heat Treated ◽  
Potential Factors ◽  
Engine Blocks ◽  
Increased Strength ◽  
Cylinder Bore ◽  
Cylinder Bore Distortion

This study investigates the potential factors which may cause cylinder bore distortion in V6 aluminum engine block with cast-in gray iron liners. In this research, the microstructure, mechanical properties and residual stress of 319 type aluminum alloy engine blocks were analyzed from top to bottom along the interbore regions in the TSR, T7 heat treated and service (dyno) tested conditions. The results suggest that the cooling rate increased significantly along the cylinder in the vicinity of the chill plate at the bottom of the engine block. This caused a significant refinement in the microstructure which increased the hardness and tensile strength at the bottom of the cylinder relative to the top. The increased strength at the bottom of the cylinder prevented the rapid relief of residual stress at elevated temperature, which suggests that the bottom of the cylinder is less susceptible to cylinder distortion.

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