3D EHD lubrication and wear for piston ring-cylinder liner on diesel engines

Jiang, Yankun; Zhang, Jianping; Hong, Guang; Wan, Li; Liu, X.

doi:10.1007/s12239-015-0001-x

Cited by 21 publications

(12 citation statements)

References 18 publications

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“…Compression ring-cylinder liner system in internal combustion engine usually acts as a seal between the combustion chamber and the crankcase [ 1 – 4 ]. In generally, the tribological properties of the compression ring-cylinder liner system affect greatly the seal performance and energy efficiency of the engine because the surface materials of cylinder liner and compression ring wear out during the operation [ 5 , 6 ]. Under this case, the tribological properties of the compression ring-cylinder liner system have been paid special attention to improve the seal performance and energy efficiency maximally.…”

Section: Introductionmentioning

confidence: 99%

Evaluation on the tribological performance of ring/liner system under cylinder deactivation with consideration of cylinder liner deformation and oil supply

et al. 2018

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In gasoline engines, CDA (cylinder deactivation) affects greatly the tribological performance of ring/liner system while reducing the emissions and improving the fuel economy. The analyses on the tribological performance of ring/liner system under the CDA mainly focus on the ideal circular cylinder liner and fixed fully flooded lubrication condition. In this study, a numerical investigation on the tribological performance of a compression ring-cylinder liner system is presented under the CDA with consideration of the cylinder liner deformation and the transition between the fully flooded and starved lubrication conditions. A mixed lubrication model coupled with oil transport model and JFO (Jacobson-Floberg-Olsson) conservative cavitation algorithm is proposed to evaluate the frictional properties. Based on the model, the tribological performance is investigated under the standard operation condition and the CDA. Meanwhile, the influence of cylinder liner deformation and oil supply on the tribological performance is also evaluated. Results show that the tribological performance of the compression ring-cylinder liner system is greatly changed when the CDA is adopted. In particular, under the CDA, the overall power loss and FMEP (friction mean effective pressure) value are increased about 27.29% and 53.51%. The study also demonstrates the necessity to consider the cylinder liner deformation and oil supply in the simulation of compression ring-cylinder liner system under the CDA.

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Section: Introductionmentioning

confidence: 99%

Evaluation on the tribological performance of ring/liner system under cylinder deactivation with consideration of cylinder liner deformation and oil supply

et al. 2018

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“…In current researches on the lubrication of engine piston ring, most were based on a hypothesis that the frictional conjunction is on a flooded lubrication status. [1][2][3][4][5][6]8,10,11,14,[16][17][18][19] Although some others belong to the starved lubrication analysis, the one-dimensional model, a certain form of starved lubrication status or simplified manner were generally used. 7,9,15,[20][21][22][23][24][25][26] In the lubrication analysis of engine piston ring, it is vital to confirm the quantity, distribution and shape of lubricating oil in the frictional conjunction, because they will decide the selection of calculation model and boundary condition, and will affect directly the validity and reliability of analysis result.…”

Section: Introductionmentioning

confidence: 99%

“…The significant effect of the cavitation on the lubrication characteristics of piston ring is occurred generally near the TDC (top dead centre) of the combustion. Jiang 14 and Guo 15 presented the elastohydrodynamic lubrication. Gu 16 and Usman 17 studied the application of surface texture.…”

Section: Introductionmentioning

confidence: 99%

“…Tian 23 presented a one‐dimensional mixed model considering the oil transport. In current researches on the lubrication of engine piston ring, most were based on a hypothesis that the frictional conjunction is on a flooded lubrication status 1‐6,8,10,11,14,16‐19 . Although some others belong to the starved lubrication analysis, the one‐dimensional model, a certain form of starved lubrication status or simplified manner were generally used 7,9,15,20‐26 .…”

Section: Introductionmentioning

confidence: 99%

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Research on the influence of the lubrication status at the inlet on the lubrication characteristics of engine piston ring

Sun

Zhu

Wang

et al. 2020

Lubrication Science

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In current researches on the lubrication of engine piston ring, some were based on a hypothesis that the piston ring is on a flooded lubrication status. Although some others belong to the starved lubrication analysis, the onedimensional model, a certain form of starved lubrication status or simplified manner were used. In this paper, on the basis of the equations about the lubricating oil flow-rate and control volume, a flow model of lubricating oil in the piston ring-cylinder liner conjunction is established, and the influence of the situation of supplied lubricating oil film at the piston ring inlet on the twodimensional starved lubrication characteristics of piston ring for a four-stroke engine is studied. The results indicate that the lubrication condition at the piston ring inlet has significant impact on the lubrication characteristics of piston ring. When the supplied lubricating oil at the piston ring inlet increases, the minimum film thickness of piston ring will increase, meanwhile the maximum film pressure, asperity contact force, friction force and power loss will decrease. If the film thickness at the piston ring inlet is smaller, the increase of the supplied film thickness can improve obviously the lubrication characteristics of piston ring.

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“…Tian 19 calculated the minimum oil film thickness and friction loss of the piston ring pack; the method to calculate the oil film thickness left on the cylinder liner when the engine runs at top dead center (TDC) and bottom dead center (BDC) was discussed with emphasis, and their findings are also used in this study to simplify the calculation of the stuffing box ring’s starved lubrication near BDC and TDC. In addition, more influencing factors were considered and discussed by the scholars to predict the tribological performance of the piston ring pack accurately, such as the effect of surface topography, non-axisymmetrical effect, setting of the boundary conditions, non-circular cylinder bore, elasto-plastic contact effect, elastic deformation, and ring coatings; 20–27 however, as for the exploration of the influencing factors of the stuffing box-piston rod system, there is still much work to do.…”

Section: Introductionmentioning

confidence: 99%

A tribological analysis on stuffing box-piston rod system of low-speed marine diesel engines

Meng

Xie

2018

International Journal of Engine Research

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The stuffing box-piston rod system is widely used in the low-speed marine diesel engines to scrape oil and ensure sealing. Its friction power loss and wear rate are great, but the studies about the system are very limited. In this study, based on the special structure and working conditions of the stuffing box, the analytical model for the tribological properties of the stuffing box-piston rod system is developed considering the oil starvation and relative ring location effects. The minimum oil film thickness, friction, oil transportation, and asperity contact are calculated for the stuffing box. The analysis results show that compared with the fully flooded lubrication, the minimum oil film thicknesses of the rings reduce significantly in the middle of the strokes under the starved lubrication condition, but the friction losses of the rings are influenced by the comprehensive effects of the oil film thickness reduction and lubricating area reduction under the starved lubrication condition, which is related to the specific profiles of the rings. In addition, compared with the engine piston ring pack, the relative ring location effect is more obvious in the stuffing box ring pack because there are more rings and the ring intervals are larger. The relative ring location effect makes the minimum oil film thicknesses, friction forces, and asperity contacts of the rings have oscillations after bottom dead center and top dead center.

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3D EHD lubrication and wear for piston ring-cylinder liner on diesel engines

Cited by 21 publications

References 18 publications

Evaluation on the tribological performance of ring/liner system under cylinder deactivation with consideration of cylinder liner deformation and oil supply

Evaluation on the tribological performance of ring/liner system under cylinder deactivation with consideration of cylinder liner deformation and oil supply

Research on the influence of the lubrication status at the inlet on the lubrication characteristics of engine piston ring

A tribological analysis on stuffing box-piston rod system of low-speed marine diesel engines

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