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Bearing Feeds

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The development of a new bearing material is undoubtedly an exacting and complex business. Likewise, the choice of a suitable lubricating fluid is not without its trials and tribulations, especially if for reasons of efficiency you are trying to break new ground in a competitive world. But bringing these together and ensuring that the right components receive precisely the correct amount of fluid throughout the engine cycle takes the problem to a higher level. The design and development of...

Bearing lubrication

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The total friction in an engine is the sum of that emanating from a number of different sources operating at a range of widely varying conditions. Temperature, load, surface condition and shear rate are all implicated in this total amount of friction generated, and depending on how these parameters relate, a particular set of components will produce more or less of it. The engine lubricant, of course, is primarily intended to reduce this friction and hence the wear in a component and...

Aluminium and tin

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Despite many years of bearing development there are still those who argue that there is no better material than babbits. For corrosion resistance, embeddability, conformability and their ability to support thick hydrodynamic oil films for instance, babbits have no peers. However, for mechanical strength and consequently fatigue properties, particularly at elevated temperatures, their life is low. And so for many years the tri-metal copper-lead substrate applied to a steel backing shell...

Bearing wear

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Even after more than 30 years in the engine business, the bearing systems in modern internal combustion engine still amaze me. Made from a mixture of aluminium and tin on a steel backing (for bi-metallic examples) or a mixture of copper, silicon and nickel topped off with an aluminium-tin overlayer, even after many hours of running, after stripping the engine I have seen bearings as good as new. And of course this is what the designer is aiming for because in theory, once rotating, the...

Future cracked

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Defined as "a device supporting a mechanical component and enabling relative movement to another with the minimum of loss of power", a bearing is not just about the selection of the most appropriate material but also - you might not be surprised to learn - about its shape. So while the fatigue strength, embeddability, resistance to wear and seizure are all important, the running clearance between the journal and bearing surface is equally important. This is especially so as engine...
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