Low viscosity engine oils: Study of wear effects and oil key parameters in a heavy duty engine fleet test

Macián, Vicente; Tormos, Bernardo; Ruíz, Santiago; Mezquita, Guillermo Miró

doi:10.1016/j.triboint.2015.08.028

Cited by 48 publications

(26 citation statements)

References 42 publications

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“…To assess this shear thinning behaviour, a viscosity at high temperature and high shear rate (HTHS-viscosity) is standardized. It is shown that the HTHS-viscosity directly affects the mechanical efficiency of the engine in fleet tests [14,15], which demonstrates the necessity to realistically consider the non-Newtonian behaviour of the lubricant in the simulation. There exists a further lubricant property counteracting the non-Newtonian behaviour in journal bearings, which increases the lubricant viscosity locally under load.…”

Section: Complex Rheological Properties Of Modern Lubricantsmentioning

confidence: 99%

Friction and Wear in Automotive Journal Bearings Operating in Today’s Severe Conditions

Sander¹,

Allmaier²,

Priebsch³

2016

Advances in Tribology

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A current trend in the transport sector seeks to increase the vehicle efficiency and to cut fuel consumption which leads to new technologies and advancements in modern and future combustion engines. Some of these technical progresses lead to highly stressed engine parts and new challenges arise, particularly for journal bearings. The increasing thermal and mechanical load caused by downsized and turbocharged engines, friction reduction by employing low-viscosity lubricants and other emission reduction measures-for utilizing stop-start systems-put additional stress on the crankshaft journal bearings. This contribution focuses on highly stressed journal bearings which operate in the boundary, mixed and hydrodynamic lubrication regime. Therefore, measurements on a journal bearing test-rig are performed which allow an extensive verification of the numerical investigation. For the numerical analysis of friction and wear, a mixed elasto-hydrodynamic simulation approach is developed, which considers the elastic deformation of the contacting components, the complex rheological behaviour of the lubricant and metal-metal contact if the lubricant is unable to separate the contacting surfaces. Both the rheological data and the surface roughness parameters are obtained from measurements. The current challenges are studied in four application-oriented examples and the influencing parameters on a reliable friction and wear prediction are explored.

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Section: Complex Rheological Properties Of Modern Lubricantsmentioning

confidence: 99%

Friction and Wear in Automotive Journal Bearings Operating in Today’s Severe Conditions

Sander¹,

Allmaier²,

Priebsch³

2016

Advances in Tribology

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“…En 3000 rpm, el valor es mayor con ecopaís (posiblemente, en este punto se dio el fenómeno de emulsión entre el aceite y el combustible con etanol que, al estar el aceite a una temperatura de 110 °C, la cantidad de alcohol se evaporó, afectando a la calidad de combustión (Costa & Spikes, 2016), y tiende a decrecer con un régimen hasta 4000 rpm. La posible causa de mayor aceleración efectiva RMS con gasolina se debe a que la viscosidad del lubricante disminuye conforme aumenta la temperatura, ocasionando un mayor adelgazamiento de la película de aceite que generará que el contacto entre superficies de partes móviles produzca un incremento en las vibraciones del motor debido a su fricción (Macián et al, 2016;Severa et al, 2014). En las figuras 5 y 6 se muestra el análisis en mención.…”

Section: Aceleración Rms (Vibraciones)unclassified

“…Estudios han demostrado que, de manera general, al tener un aumento en la temperatura del lubricante, su viscosidad tiende a disminuir, ocasionando menor fricción entre componentes móviles pertenecientes a la máquina térmica (Harigaya, Suzuki, & Takiguchi, 2003;Severa, Havlíček, & Kumbár, 2014) . La fricción interna del motor puede llegar a representar el 50% del total de las pérdidas mecánicas (Macián, Tormos, Ruiz, & Miró, 2016). A su vez, un cambio de temperatura de tan sólo 100 °C, puede causar una variación de hasta 1000 veces en la viscosidad del aceite (Rasid, Mohamad, Ghazali, & Mahmood, 2012).…”

Section: Introductionunclassified

Relación Existente entre la Temperatura del Aceite del Motor, Régimen de Giro y Aceleraciones Efectivas RMS, al Utilizar Gasolina y una Mezcla entre Gasolina-Etanol

Castillo

Gutiérrez

Cando

et al. 2017

IRJ

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En este estudio experimental se ha determinado la relación existente entre la temperatura del aceite lubricante del motor, el régimen de giro y las aceleraciones mecánicas efectivas RMS (Root Mean Square), al utilizar gasolina tipo extra y una mezcla entre gasolina al 95% y etanol al 5% (conocida comercialmente como ecopaís E5); en un vehículo Flex Fuel con motor ciclo Otto, sometiéndolo a una prueba estática y dinámica. Los resultados obtenidos muestran que la temperatura del lubricante tiende a estabilizarse en un mayor tiempo cuando se realiza la prueba con carga al motor, en contraste con el ensayo sin carga. Por otro lado, dicha magnitud incrementa conforme aumenta el régimen de giro para los dos casos; siendo esta menor, de manera general, al utilizar la mezcla combustible a base de gasolina y etanol. Para el caso de las aceleraciones mecánicas, se cumple una tendencia similar, puesto que son menores, habitualmente, al utilizar ecopaís E5.

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“…With increasing wear particles in lubrication oil system, the wear of engine parts will be increased [27]. There is several particles such as iron, aluminum, copper, chromium, and lead in engine oil, however, among the wear particles in engine oil, molybdenum, nickel, and iron content was more than aluminum, chromium, and magnesium [28].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Calcite and Silica Sand Dust on the Diesel Engine Oil Quality

et al. 2019

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Viscosity, density, pour point, flash point, and oxidation stability are some quality properties of engine oil. The entrance of any contamination into the engine oil can change its properties. In the present study the effect of calcite and silica sand dust particles on the quality of engine oil, namely, Sepahan Oil Production API, SC-CC, SAE 40, was investigated. The presence, amount, and particle size of silica and calcite in the engine oil were determined by X-ray diffraction (XRD), inductively coupled plasma spectroscopy (ICP), and energy dispersive X-ray spectroscopy (EDX), respectively. The concentrations of the silica and calcite particles (0, 1, 2, and 3 g/L) were used according to the dust conditions in the east of Isfahan, Iran. The quality of the oil was measured after 20 hours of the engine operation. The results showed viscosity, density, and the pour point of the engine oil were significantly (P<0.05) enhanced with the increase in the silica content, and its oxidation stability was decreased. However, no significant change was observed in the engine oil flash point. The calcite particles, except for the oil flash point, did not have any significant effects on the oil quality.

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Low viscosity engine oils: Study of wear effects and oil key parameters in a heavy duty engine fleet test

Cited by 48 publications

References 42 publications

Friction and Wear in Automotive Journal Bearings Operating in Today’s Severe Conditions

Friction and Wear in Automotive Journal Bearings Operating in Today’s Severe Conditions

Relación Existente entre la Temperatura del Aceite del Motor, Régimen de Giro y Aceleraciones Efectivas RMS, al Utilizar Gasolina y una Mezcla entre Gasolina-Etanol

The Effect of Calcite and Silica Sand Dust on the Diesel Engine Oil Quality

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