A Dynamic Theory of Piston-Ring Lubrication : 1st Report, Calculation

Furuhama, Shoichi

doi:10.1299/jsme1958.2.423

Cited by 96 publications

(22 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At the same time, the scope, complexity and evidentiary accuracy of these models are constantly increasing. In 1959, Furuhama [6] developed a transient hydrodynamic lubrication model based on the one-dimensional solution of the Reynolds equation for a piston ring and compared the theoretical results with the experiment [7]. In their works [8,9] Furuhama et al did theoretical and experimental research on the gas transport through the ring-pack and contrasted the results with the gas-dynamic labyrinth model based on Eweis's work [10].…”

Section: Introductionmentioning

confidence: 99%

“…Thus the influence of oil phase, oil transport and mixed friction were not considered. In summary, it can be asserted that a majority of the existing simulation procedures are based on the average Reynolds equation solution with consideration for the roughness impact [6,12,16,25,35] and the contact calculation according to Greenwood and Tripp [17] asperity contact model for determining the boundary friction ratio in the mixed friction area. The gas dynamics in the ring-pack is described with the labyrinth model (isentropic orifice flow) according to Eweis or according to the capillary model [8][9][10]18,25,35].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

2D CFD-model of the piston assembly in a diesel engine for the analysis of piston ring dynamics, mass transport and friction

Lyubarskyy

Bartel

2016

Tribology International

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

2D CFD-model of the piston assembly in a diesel engine for the analysis of piston ring dynamics, mass transport and friction

Lyubarskyy

Bartel

2016

Tribology International

View full text Add to dashboard Cite

“…Due to the dynamic effect of the oil-film formed between the piston ring and the cylinder bore, the minimum value of the oil-film thickness occurs with a slight delay from the TDC and BDC. So, the peak surface pressure value also occurs with a slight delay [19]. The comparison result of the pressure peak value in each waveform is shown in Fig.…”

Section: Test Resultsmentioning

confidence: 93%

A Study on Sliding Surface Pressure Measurement of Piston Ring under Reciprocating Condition Using Thin-Film Sensor

et al. 2019

View full text Add to dashboard Cite

In the tribology of mechanical elements using lubricating oil, verification of the dynamic surface pressure distribution during sliding operation is necessary in order to elucidate the sliding condition. The same also applies to the piston rings which are the sliding part of compression reciprocating device. Although some verification case in static condition or limited sliding area has been studied, there are many unknown aspects in this field. The thin-film sensor, since it has small influence on the shape of the sliding surface, is widely used as a measurement method of the sliding surface pressure between two different surfaces, however this method has never been applied to the piston ring in the past. In this study, various film deposition methods on the piston ring of the thin-film sensor were examined, and the thin-film pressure sensor with a total thickness of 4.6 μm was successfully formed on the sliding surface by sputtering. The surface pressure distribution of the sliding part was measured using the reciprocating sliding tester by this thin-film pressure sensor, and the measurement values were in good agreement with the mixed lubrication model between the piston ring and the cylinder liner.

show abstract

“…3, modeled following the procedure described in Ref. (21) Blok's theory predicts a maximum ring face temperature of 356°C for a mean cylinder liner temperature of 180°C and a friction coefficient of 0.12 under these conditions. Occasionally, however, an isolated area of unusually high contact stress occurs.…”

Section: Laboratory-scale Wear Testsmentioning

confidence: 99%

Lacey

Stockwell

1999

Tribology Transactions

View full text Add to dashboard Cite

The requirements placed on lubricating oils at the top ring reversal point are becoming increasingly severe due to recent changes in engine technology, most of which are driven by emissions regulations. As a result, revised engine tests to evaluate cylinder liner scuffing are being introduced to engine oil specifications. Despite the high cost and generally poor repeatability of ,full-scale engine data, no laboratory screener test is commercially available. In the present study, various lubricant characteristics were correlated with the level of scuffing in the Detroit Diesel 6V92TA engine test. Good initial agreement was obtained with lubricant volatility measured at 525'C, which is predicted to be (he approximate contact temperature under the most extreme conditions likely to exist during normal operation. Measurement of lubricant volatility, howevec yields no indication of additive response and also appears to become less accurate when applied to unconventional basesrocks. As a result, a laboratory-scale wear rest was developed to predict scufing resistance under high stress conditions. The results of the wear and volatility rests are combined using a simple equation to form the Diesel Engine Oil Scuff Test (DEOST). The resulting methodology provides an R' correlation of70 percent with scuffing measured in the 6V92TA engine and is sensitive to both basestock characteristics and ontiwear additives. In addition, the DEOST results indicated that viscosity index improvers provide little benefit under hightemperature operation, an effect commonly observed by failure of petroleum-based multigrade oils in the 6V92TA engine test.

show abstract

A Dynamic Theory of Piston-Ring Lubrication : 1st Report, Calculation

Cited by 96 publications

References 0 publications

2D CFD-model of the piston assembly in a diesel engine for the analysis of piston ring dynamics, mass transport and friction

2D CFD-model of the piston assembly in a diesel engine for the analysis of piston ring dynamics, mass transport and friction

A Study on Sliding Surface Pressure Measurement of Piston Ring under Reciprocating Condition Using Thin-Film Sensor

Development of a Methodology to Predict Cylinder Liner Scuffing in the 6V92TA Engine Lubricant Test©

Contact Info

Product

Resources

About