Engine Lubrication System for Oil Flow Reduction

Ferreyra, Sergio Adrian; Uehara, Samantha; Ferreira, Matheus dos Santos; Mian, Omar Y.

doi:10.4271/2011-36-0205

Cited by 6 publications

(2 citation statements)

References 5 publications

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“…As shown in figure 1, the crankshaft represents around 1.65% of mechanical losses and OEM´s are more frequently adopting configurations that reduce the oil flow to the crankshaft area. In some cases the oil flow is reduced by 50% or more [2] in a way to adopt smaller oil pumps reducing not only mechanical losses but also hydrodynamic losses once less oil is available to the moving parts. Figure 2 shows the typical main bearings features.…”

Section: Introductionmentioning

confidence: 99%

Bronzinas Centrais com Canal de Óleo Otimizado para Redução de Perdas na Bomba de Óleo

Ferreira¹,

Silva²

2021

Blucher Engineering Proceedings

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The main focus of ROTA 2030 program is to identify how to enable further fuel savings giving the efforts implemented by Inovar-Auto, e.g. at crankshaft area.In a way to reduce friction losses and fuel consumption, OEMs are adopting features like variable oil pumps, new crankshaft oil drilling (e.g. one main bearing feeding two connecting rod bearings) and new configuration for the main bearings oil grooves. Usually a full groove (180°) is specified for the upper main bearing once it delivers the necessary oil flow and pressure to the connecting rod bearings with a cost effective manufacturing process. By adopting a partial groove configuration, which can typically vary from 90° to 170°, the overall oil flow to the bearings can be reduced once side flow is reduced. Such design solution enables the oil pump to work more efficiently specially when in a variable flow design. The challenge remains on keeping Minimum Oil Film Thickness (MOFT) safe to ensure robustness and durability. However, the adoption of partial grooves increases manufacturing costs considerably.Using CFD simulation and dynamometer engine test, a new optimized main bearing oil groove was developed, which combines the reduced flow of the partial oil groove with the manufacturability of a full groove.

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Section: Introductionmentioning

confidence: 99%

Bronzinas Centrais com Canal de Óleo Otimizado para Redução de Perdas na Bomba de Óleo

Ferreira¹,

Silva²

2021

Blucher Engineering Proceedings

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“…Bukovnik et al 11 studied the effects of oxidation products, soot particles, evaporation of base oil and dilution of fuel on the viscosity of lubrication oil. Ferreyra et al 12 used the elasto-hydrodynamic lubrication (EHL) model to study the effects of bearing clearances, oil grooves and oil passages on oil supply. Dhar et al 13 calculated the lubrication system of a multi-cylinder engine, considering the cavitation and dry contact of bearings.…”

Section: Introductionmentioning

confidence: 99%

The effects of material and structure of main bearing caps on crankshaft lubrication of diesel engine

et al. 2020

International Journal of Engine Research

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The elastic deformation of the crankshaft and engine block has important effects on lubrication performance of main bearings of the diesel engine. But the effect of main bearing caps was rarely analyzed. The purpose of this article is to analyze and compare the tribological performances of main bearings of a 20-V medium-speed diesel engine with different materials and structures of main bearing caps. A coupled multi-elastic body and elasto-hydrodynamic model is established for a 20-V medium-speed diesel engine. The deformations of engine block, crankshaft and bearing caps are simulated with finite element modal condensation method. The bearing lubrication analysis is based on the extended Reynolds equation considering the deformation of contact surface and solved by finite difference method. Two materials and four structures of the main bearing cap are analyzed with the coupled model. The distribution of oil film pressure, thickness and bearing thermal loads are obtained and analyzed. The main bearing cap of iron is better than steel on bearing lubrication performance. With the lower edge stiffness of bearing cap, the maximum oil film pressure of bearing can be reduced by 13%. Meanwhile, the bearing thermal load can be reduced by 53%. The results show that when the bearing cap material is iron and with large trough on both sides of bearing cap, the peak value of edge pressure and the average heat load of main bearing can be reduced effectively under the premise of ensuring stiffness.

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