Practical tribological issues in big-end bearings

doi:10.1533/9781845699932.2.615

Tribology and Dynamics of Engine and Powertrain

Fundamentals, Applications and Future Trends

2010, Pages 615-634

Tribology and Dynamics of Engine and Powertrain

https://doi.org/10.1533/9781845699932.2.615 Get rights and content

Abstract:

This chapter focuses upon practical design guidelines for big-end connecting rod journal bearings which allow for rapid prediction of three key tribological performance measures: cyclic minimum film thickness, cyclic average oil flow and cyclic average power loss. Design information, provided in both graphical and equation form, apply specifically to a grooveless big-end bearing pressure-lubricated by a single crank-pin feed hole. In addition, this chapter reviews the current state of tribological research aimed at improving design capabilities for big-end bearings and suggests related topics for further study.

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Cited by (7)

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Citation Excerpt :
Later, Booker [39] developed a tribo-dynamic method, referred to as the Mobility Method, in order to tackle the dynamic effects in big-end bearings. The approach is detailed by Bodeo [40], together with its practical implications for prediction of conditions in big-end bearings. Bates et al. [41] also presented a theoretical model for dynamic loading of big-end bearings and validated it against experimental measurements.
Thermo-mixed-hydrodynamics of compression rings and big-end bearings are presented. Frictional losses under normal engine operating conditions for a gasoline engine and those with cylinder deactivation (CDA) are predicted. With CDA, the combustion chamber pressure increases in the active cylinders, whilst some residual pressure remains in the deactivated ones. For the former, the increased in-cylinder temperatures reduce viscous friction, whilst reducing the load carrying capacity, promoting increased boundary interactions. In deactivated cylinders, lower contact temperatures yield increased viscous friction. Overall, a 5% improvement in expended fuel is expected with the application of CDA. However, 10% of these gains are expended due to increased friction. The study demonstrates the need to consider total system effects when introducing new technologies such as CDA.
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19 - Practical tribological issues in big-end bearings

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