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

Hasegawa, Hiroki; Kikuhara, Koji; Ito, Akemi; Nishijima, Shunsuke; Inui, Masatsugu; Akamatsu, Hirotaka

doi:10.1115/1.4040746

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…Furthermore, studies in [17] measured the pressure under TPOCR through an experimental approach and found that an increased oil pressure under the TPOCR can lead to a higher oil consumption. Based on that, additional work in [18][19][20] analyzed the factors to reduce oil pressure under the TPOCR and pointed out a proper design of drain holes is needed.…”

Section: Introductionmentioning

confidence: 99%

Sources and Destinations of Oil Leakage through TPOCR Based on 2D-LIF Observation and Modeling Analysis

Li,

Tian

2023

Lubricants

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The Three-Piece Oil Control Ring (TPOCR) is becoming a viable option for heavy duty gas and hydrogen engines due to the low particle concentration in these engines. Although direct oil leakage from the gap is not likely to happen with the misalignment of the upper and lower rail gaps, there exist other less-apparent oil leaking mechanisms through the TPOCR. This work is targeted at understanding the oil leakage’s source and destination through the rail and liner interfaces across the whole cycle. The 2D Laser Induced Fluorescence technique was applied on an optical engine to study the oil transport behavior. Combined with a TPOCR model for dynamics and lubrication, the mechanisms that cause rail twist and oil scraping by the upper rail were analyzed. It was found that the symmetrical rail can scrape the oil up in the up-strokes. The scraped oil first accumulates in the clearance between the upper rail and groove, as well as at the upper corner of the rail Outer Diameter before being transferred to both the third land and liner when the piston changes direction at Top Dead Center. Rails with an asymmetrical profile can reduce or enhance these effects depending the orientation of the rails. This study provides findings that could help design the engine to better control Lubricate Oil Consumption and properly lubricate the Top Dead Center’s dry region at the same time.

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Section: Introductionmentioning

confidence: 99%

Sources and Destinations of Oil Leakage through TPOCR Based on 2D-LIF Observation and Modeling Analysis

Li,

Tian

2023

Lubricants

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“…This provides a good view that downwards blowby is a critical factor to reduce LOC and is therefore a good design to balance the high load's blowby, and low load's LOC should be achieved. Studies focused on drain holes [6][7][8] pointed out that the drain holes' size, number and location are critical to both LOC and blowby, and also linked higher blowby to lower LOC.…”

Section: Introductionmentioning

confidence: 99%

Effect of Blowby on the Leakage of the Three-Piece Oil Control Ring and Subsequent Oil Transport in Upper Ring-Pack Regions in Internal Combustion Engines

Tian

2022

Lubricants

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The lubricating oil consumption (LOC) in internal combustion engines contributes to emission and deteriorates the performance of the aftertreatment. In this work, an optical engine with a 2D Laser-induced fluorescence (2D-LIF) system was used to study operating conditions critical to real driving oil emissions. Additionally, numerical models were used to analyze the ring dynamics, oil flow and gas flow. It was found that the intake pressure that results in zero blowby is the separation line between two drastically different oil flow patterns in the ring pack. With intake pressure lower than the separation line, the oil accumulation of the three-piece oil control ring groove (TPOCR) begins to increase, followed by the drastic increase of the oil accumulation in the third land, second land, and finally visible oil leaking through the top ring gap, given enough time. The time required for the oil to leak through different rings was investigated using both measurements and modeling. The effects of drain holes and rail gaps, as well as their relative rotation on oil accumulation and leakage from the TPOCR groove, were analyzed. These findings contribute to improving ring pack designs and engine calibration in spark ignition (SI), gas, and hydrogen engines equipped with TPOCR to minimize the negative impacts of LOC.

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A Study on the Oil Film Thickness Between the Lower Rail of Oil Control Ring and Lower Flank of Oil Control Ring Groove of an Engine

Miura,

Ito,

Nakamura

et al. 2024

Journal of Engineering for Gas Turbines and Power

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Lubricating oil consumption (LOC) of engines causes particulate matter in exhaust gas and abnormal combustion like pre-ignition which becomes a serious problem in hydrogen engines. Lubricating oil transports upward into the combustion chamber of an engine via the sliding surface, the gap, and the side and back of a piston ring. The target of this study was clarifying the mechanism of oil flowing between an oil control ring lower flank and the groove which was the first entrance of lubricating oil supplied from the crank shaft. Oil film thickness at the lower flank of the oil control ring was measured by laser induced fluorescence method using optical fibers embedded in the lower flank of the ring groove. The measured oil film thickness was compared with forces acting on the lower rail of three-piece type oil control ring. The oil film thickness change was well explained using those forces and it was found that friction force at the sliding surface and pressure in the ring groove were dominant on the oil film thickness under all operating conditions tested in this study.

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

Cited by 3 publications

References 4 publications

Sources and Destinations of Oil Leakage through TPOCR Based on 2D-LIF Observation and Modeling Analysis

Sources and Destinations of Oil Leakage through TPOCR Based on 2D-LIF Observation and Modeling Analysis

Effect of Blowby on the Leakage of the Three-Piece Oil Control Ring and Subsequent Oil Transport in Upper Ring-Pack Regions in Internal Combustion Engines

A Study on the Oil Film Thickness Between the Lower Rail of Oil Control Ring and Lower Flank of Oil Control Ring Groove of an Engine

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