A Computational Study of the Lubricant Transport into Oil Control Ring Groove

Fang, Tianshi; Meng, Zhen; Ahling, Sebastian; Tian, Tian

doi:10.4271/2019-01-2362

Cited by 2 publications

(1 citation statement)

References 10 publications

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“…The oil can enter the OCR groove through both the liner and piston shown in Figure 17. The first oil flow path is present during the entire down stroke when the oil on the liner is scraped and spread into the groove [22]. Thus, residing on the liner below the oil control ring is a determining parameter of the rate of oil supply from this path.…”

Section: Lower Rail Gapsmentioning

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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Section: Lower Rail Gapsmentioning

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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Prediction and Experimental Verification for Oil Transport Volume around Three-Piece Type Oil Control Ring Affecting Lubricating Oil Consumption

Mochizuki¹,

Sasaki²,

yazawa³

et al. 2022

SAE Int. J. Adv. & Curr. Prac. in Mobility

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<div class="section abstract"><div class="htmlview paragraph">Reducing of lubricant oil consumption (LOC) remains a major issue for internal-combustion engines. Especially in recent years, in order to comply with Particular Number (PN) regulations and lower oil viscosity to reduce friction loss, need to reduce the LOC has increased. Controlling the upward oil flow, that passes the piston and piston rings, is effective in reducing the LOC. In addition, oil control ring (OCR) has significant effect on upward oil flow. Therefore, development of a high-precision prediction method of oil behavior around the OCR is important for prediction of LOC. So, the model of Three-piece type oil control ring (3POCR) motion within the OCR groove and the model of oil behavior around the 3POCR were developed using the computer aided engineering (CAE) method in this paper. These models calculate in detail the upward oil outflow to the 3rd land from the OCR groove, which is based on the relation between the OCR motion and the gas pressure as well as the inertial force of oil. Since factors that greatly affect the prediction accuracy are the gas pressure around the OCR and the OCR motion, these were measured and verified in the actual engine. Furthermore, oil behavior observation using in-cylinder visualization engine, and oil film thickness measurement using optical fiber were conducted for experimental verification of the oil behavior model around the 3POCR. As a result, qualitative tendency of calculated results and measured results showed good agreement. Also, comparison in two different OCR specification, the similarly tendency was obtained. Therefore, the effectiveness of the developed prediction model was confirmed.</div></div>

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A Computational Study of the Lubricant Transport into Oil Control Ring Groove

Cited by 2 publications

References 10 publications

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

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

Prediction and Experimental Verification for Oil Transport Volume around Three-Piece Type Oil Control Ring Affecting Lubricating Oil Consumption

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