An Experimental Study on Relationship between Lubricating Oil Consumption and Cylinder Bore Deformation in Conventional Gasoline Engine

2009 ◽  
Vol 2 (1) ◽  
pp. 106-113 ◽  
Author(s):  
Naoki Iijima ◽  
Takeo Sakurai ◽  
Masaaki Takiguchi ◽  
Yasuo Harigaya ◽  
Takeshi Yamada ◽  
...  
Keyword(s):  
Experimental Study ◽  
Gasoline Engine ◽  
Lubricating Oil ◽  
Oil Consumption ◽  
Cylinder Bore

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.

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.

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.

A Study on a Rotational Force Acting on the Piston Ring of a Gasoline Engine

2019 ◽  
Author(s):  
Kenta Tomizawa ◽  
Akemi Ito
Keyword(s):  
Piston Ring ◽  
Gasoline Engine ◽  
Periodic Wave ◽  
Operating Conditions ◽  
Wave Form ◽  
Oil Consumption ◽  
Rotational Force ◽  
Oil Transport ◽  
Ring Rotation ◽  
Cylinder Bore

Abstract Oil consumption of an engine causes particulate matter, poisoning catalysts and sometimes abnormal combustion like pre-ignition. One of the factors of oil consumption is oil transport via a piston ring-gap. Coincident of ring-gaps at a same position may cause an increase in oil consumption. In this research, the effect of coincident the ring gaps on oil consumption was measured using with/without the a stopper pin for the ring rotation by sulfur tracer method. A lot of spikes was found in the wave form of sulfur concentrate for the rings without the stopper pin, and higher value of oil consumption was simultaneously measured. Then the force which caused ring rotation (hereafter ‘rotational force’) was measured by a newly developed method. A cantilever was installed in the ring gap, and the strain gauges were pasted on the cantilever. Therefore, the rotational force was measured as the bending stress of the cantilever. It was found that the rotational force showed a periodic wave form against the crank angle. Furthermore, it was also found that the amplitude of the rotational force was strong affected by the engine operating conditions. The rotational force was also affected by the gap position. It was assumed that not only the piston lateral motion but also the cylinder bore shape affected the rotational force. The mechanism of generating the rotational force is the future subject.

A Study on the Distribution of Oil Film Thickness in the Circumferential Direction of Oil Ring in a Gasoline Engine

2019 ◽  
Author(s):  
Akemi Ito ◽  
Tadatsugu Hakkaku ◽  
Kazuya Mochiduki ◽  
Keita Tomotsune ◽  
Masatsugu Inui ◽  
...  
Keyword(s):  
Film Thickness ◽  
Piston Ring ◽  
Gasoline Engine ◽  
Axial Direction ◽  
Circumferential Direction ◽  
Sliding Surface ◽  
Oil Consumption ◽  
Measuring Point ◽  
Oil Film ◽  
Cylinder Bore

Abstract Oil traveling upward through the sliding surface of a piston ring causes oil consumption of an engine. Piston rings are designed considering conformability to deformed cylinder bore. However, cylinder deformation sometimes affects strongly oil consumption. It suggests that a piston ring cannot conform dynamically to the cylinder bore. In this study, distribution of oil film thickness of an oil ring was measured for investigating the dynamic conformability. An optical fiber has embedded in the sliding surface of the lower rail of the oil ring, and oil film thickness was measured by laser induced fluorescence method. The measuring point was rotated in the circumferential direction, so the distribution in both the circumferential and the axial direction could be measured. Thick oil films partially were found and it was found that the oil ring did not conformed to the deformed cylinder bore dynamically. Furthermore, such oil film showed thicker value than those expected theoretically. It was showed that dynamic conformability must be considered for piston ring design for reducing oil consumption.

Influence of the Position of Oil Drain Holes of a Piston on Lubricating Oil Consumption

2018 ◽  
Vol 140 (12) ◽  
Author(s):  
Hiroki Hasegawa ◽  
Koji Kikuhara ◽  
Akemi Ito ◽  
Shunsuke Nishijima ◽  
Masatsugu Inui ◽  
...  
Keyword(s):  
Piston Ring ◽  
Gasoline Engine ◽  
Pressure Sensors ◽  
Lubricating Oil ◽  
Oil Consumption ◽  
Tracer Method ◽  
Low Friction ◽  
Piston Skirt ◽  
Generation Mechanisms ◽  
Good Agreement

An increase in lubricating oil consumption in a gasoline engine causes an increase in particulate matters in exhaust gases, poisoning the catalyst after treatment devices, abnormal combustion in a turbo-charged gasoline engine, and so on. Recent trend of low friction of a piston and piston ring tends to increase in lubricating oil consumption. Therefore, reducing oil consumption is required strongly. In this study, the effect of the position of oil drain holes on oil pressure under the oil ring and lubricating oil consumption was investigated. The oil pressure under the oil ring is measured using fiber optic pressure sensors and pressure generation mechanisms were investigated. Lubricating oil consumption was also measured using sulfur tracer method and the effects of oil drain holes hence the oil pressure were evaluated. Four types of arrangement of oil drain holes were tested. The oil pressure variations under the oil ring in the circumferential direction was measured. An increase in oil pressure was found during down-stroke of the piston. The lowest oil pressure was found for the piston with four oil drain holes. Two holes nearby the front/rear end of the piston skirt showed relatively lower pressure. The measured results of oil consumption showed good agreement to measured oil pressure under the oil ring. It was found that oil pressure under the oil ring affected oil consumption, and oil drain holes set near the front/rear end of the piston skirt were effective for reducing oil consumption.

Study on Mechanism of Lubricating Oil Consumption Caused by Cylinder Bore Deformation

1996 ◽  
Author(s):  
Hideshi Hitosugi ◽  
Katsuyuki Nagoshi ◽  
Masaharu Komada ◽  
Shoichi Furuhama
Keyword(s):  
Lubricating Oil ◽  
Oil Consumption ◽  
Cylinder Bore

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.

Influence of the Position of Oil Drain Holes of a Piston on Lubricating Oil Consumption

2017 ◽  
Author(s):  
Hiroki Hasegawa ◽  
Koji Kikuhara ◽  
Akemi Ito ◽  
Shunsuke Nishijima ◽  
Masatsugu Inui ◽  
...  
Keyword(s):  
Piston Ring ◽  
Gasoline Engine ◽  
Pressure Sensors ◽  
Lubricating Oil ◽  
Oil Consumption ◽  
Tracer Method ◽  
Low Friction ◽  
Piston Skirt ◽  
Generation Mechanisms ◽  
Good Agreement

An increase in lubricating oil consumption in an engine causes an increase in particulate matters in exhaust gases, poisoning the catalyst of after treatment devices, abnormal combustion in a turbo-changed gasoline engine and so on. Recent trend of low friction of a piston and piston ring tends to increase in lubricating oil consumption. Therefore reducing oil consumption is required strongly. It is known that oil pressure generated under the oil ring affects lubricating oil consumption. It is also known that the position of oil drain holes affects lubricating oil consumption. In this study, the effect of the position of oil drain holes on oil pressure under the oil ring and lubricating oil consumption was investigated. The oil pressure under the oil ring is measured using fiber optic pressure sensors and pressure generation mechanisms were investigated. Lubricating oil consumption was also measured using sulfur tracer method and the effects of oil drain holes against the oil pressure under the oil ring were evaluated. Four types of arrangement of oil drain holes were tested. The oil pressure variations under the oil ring in the circumferential direction was measured using a gasoline engine. An increase in oil pressure was found during down-stroke of the piston. The lowest oil pressure was found for the piston with four oil drain holes. Two holes nearby the front / rear end of the piston skirt showed relatively lower pressure. The measured results of oil consumption showed good agreement to measured oil pressure under the oil ring. It was found that oil pressure under the oil ring affected oil consumption, and oil drain holes set near the front / rear end of the piston skirt were effective for reducing oil consumption.

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