Engine Lubrication System for Oil Flow Reduction MAHLE Metal Leve S.A

Format:

Conference/Event

Author/Creator:

Ferreyra, Ferreyra, author.

Contributor:

dos Santos Ferreira, Matheus

Mian, Omar

Uehara, Samantha

Conference Name:

SAE Brasil 2011 Congress and Exhibit (2011-10-04 : Sao Paulo, Brazil)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2011

Summary:

The reduction of oil demand for automotive engines has beendriven recently by the need to reduce oil pump capacity so thatbenefits from having a smaller size, including a reduction in powerloss and CO₂ emissions. Crankshaft bearings are generallyattributed to be the largest consumers, main bearings in particularsince the supply pressure in the upper bearing shell oil grooveover a large arc (circumferentially) coincides with high averageclearance.Measurements of oil flow indicate that the main bearing grooveis significant and there is a trade-off between lower oil flow andhigher bearing temperatures. All solutions must ensure that the oilsupply to the big-end bearings via crank drillings is notcompromised.Numerical simulation tools can be used to predict and optimizethe total oil flow required by the engine lubrication system. Inthis work, the Elasto-Hydrodynamics Simulation (EHL) was used toanalyze the oil flow required by the crankshaft main bearings. Inaddition, the influence of some crankshaft and bearing featuredesigns such as, bearing clearances, bearing oil grooveconfigurations and crankshaft oil drilling among others, wereinvestigated in terms of oil flow requirements.For the tested engine, the total oil flow requirement could bereduced by 20% by reducing the size/capacity of the oil pump bythis amount with plain upper main bearings, using a"1-to-2" crank drilling configuration. With the maximumflow reduction via "plain" upper main bearings, atemperature rise of 5-10°C was measured, but this did notjeopardize the performance of the big end bearings in durabilitytests

Notes:

Vendor supplied data

Publisher Number:

2011-36-0205

Access Restriction:

Restricted for use by site license