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Study on the influence of piston ring assembly structure on lubricating oil consumption and optimization design

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Abstract

Under the global efforts to implement strict emission regulations, higher requirements are placed on diesel engines, and a reasonable piston ring set structure can effectively reduce diesel engine lubricating oil consumption. Taking an off-road high-pressure common rail diesel engine as the research object, the numerical simulation model of piston ring assembly dynamics was built by measuring the cylinder pressure and the temperature field of the piston and cylinder liner and combined with the test results of the gas blow-by and lubricating oil consumption. The influence of piston ring assembly structure parameters on lubricating oil consumption was systematically studied, and the mathematical regression model of lubricating oil consumption was established by using the response surface method. Based on it, the optimal solution of the piston ring assembly parameters was obtained by desirability optimization. The results show that the thickness of oil ring scraping edge will have the greatest influence on lubricating oil consumption and the lowest significance of the thickness of second ring scraping edge. With the increase of the upper end reduction of the top ring and the thickness of the oil ring scraping edge, the lubricating oil consumption gradually decreases. The optimal solution with the desirability of 1 is 0.02 mm reduction of the upper end of the top ring, 0.40 mm thickness of the oil ring scraping edge and 0 mm thickness of the second ring scraping edge. And the lubricating oil consumption is 3.07 g/h, which is 15.89% less than that of the original machine.

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Abbreviations

a :

Ring opening end area, mm2

b :

Height of the top ring moving surface, mm

b fl :

Ring width of the overlapping part of the top ring and the ring groove, mm

c :

Lubricating oil concentration

D :

Cylinder bore, mm

D C :

Diffusion coefficient

f amot, f blw :

Correction factor

h fl :

Upper end gap of the top, mm

h film :

Thickness of the oil film at the fire shore, mm

h s :

Thickness of the residual oil film, mm

\(\dot{m}_{{{\text{acc}}}}\) :

The amount of lubricating oil accumulated by the top ring, g/h

\(\dot{m}_{{\text{blw-up}}}\) :

The amount of oil channeled by the top ring, g/h

\(\dot{m}_{{\text{evap,Oil}}}\) :

The amount of evaporation on the wall surface of the cylinder liner, g/h

\(\dot{m}_{{\text{pmp,top}}}\) :

The amount of oil pumped by the top ring, g/h

\(\dot{m}_{{{\text{scr}}}}\) :

The amount of oil scraped by the top ring, g/h

\(\dot{m}_{{\text{thrw-off}}}\) :

The amount of oil thrown by the top ring, g/h

P :

Local pressure, MPa

P c :

Gas pressure, MPa

P g :

Back pressure of the top ring, MPa

P film :

Oil film pressure, MPa

\(P_{1/2}\) :

Pressure at the ring bank, MPa

R :

Gas constant

t :

Time, s

T :

Gas temperature, °C

R 2 :

Coefficient of determination

R adj 2 :

Adjusted coefficient of determination

R pred 2 :

Predicted coefficient of determination

\(\rho\) :

Lubricating oil density

\(\eta\) :

Dynamic viscosity of the lubricating oil

\(\Delta t\) :

Time step, s

\(\Delta r\) :

Relative displacement of top ring, mm

\(\Delta \overline{u}\) :

Average speed difference of the oil film

\(\beta\) :

Material transfer coefficient

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Funding

This work was supported by the Chinese National Natural Science Foundation [Grant Nos. 51965027, 51805233]. Numerial computations were performed on Hefei advanced computing center.

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Author notes

  1. Xiwen Deng

    Present address: Yunnan Key Laboratory of Internal Combustion Engines, Kunming University of Science and Technology, Kunming, 650500, People’s Republic of China

Authors and Affiliations

  1. Yunnan Key Laboratory of Internal Combustion Engines, Kunming University of Science and Technology, Kunming, 650500, People’s Republic of China

    Jilin Lei, Jiatao Tang, Qimin Lei & Yang Liu

  2. Kunming Yunnei Power Co., Ltd., Kunming, 650200, People’s Republic of China

    Guofu Song & Kang Liu

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  1. Jilin Lei
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Contributions

JL was involved in conceptualization, funding acquisition, supervision and project administration. JT was involved in conceptualization, data curation, results analysis, investigation, writing—original draft and model validation. QL was involved in experiment, data curation, model validation and results analysis. YL was involved in visualization, validation, writing—review and editing and investigation. XD was involved in funding acquisition, supervision and conceptualization. GS was involved in resources and investigation. KL was involved in resources and validation.

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Correspondence to Jilin Lei or Xiwen Deng.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Technical Editor: Zilda de Castro Silveira.

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Lei, J., Tang, J., Lei, Q. et al. Study on the influence of piston ring assembly structure on lubricating oil consumption and optimization design. J Braz. Soc. Mech. Sci. Eng. 45, 388 (2023). https://doi.org/10.1007/s40430-023-04304-9

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