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Tribology of big-end-bearings
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posted on 2014-03-20, 12:50 authored by P.C. Mishra, Homer RahnejatThe parasitic frictional losses in an engine are estimated to account for 20% of the
total engine losses. These include those due to piston assembly (45%), bearings
(25%), pumping action (20%) and those attributed to the valve train system (10%).
Thus, a quarter of all the parasitic losses are due to engine bearings, which include the
main crankshaft support bearings (see chapter 18), big end bearing (see also chapter
19), and other camshaft and any rocker arm bearings. Though all these bearings are
essentially hydrodynamic journal bearings, the nature of load application,
construction and design is specific to each case. The main bearings have stationary
bushings (see also chapter 18), while the bore of the big end bearing is oscillating and
subjected to cyclic fluctuating loads from repetitive combustion pressure.
The role of the big end bearing is to sustain the transmitted forces through the
connecting rod, which are due to combustion pressure and inertial imbalance, as well
as transmitting the torque to drive the crankshaft. If it malfunctions due to any reason,
then this would lead to catastrophic engine failure. The understanding of journal
bearing concept is essential for detailed analysis of big end bearings (see chapter 18).
History
School
- Mechanical, Electrical and Manufacturing Engineering
Citation
MISHRA, P.C. and RAHNEJAT, H., 2010. Tribology of big-end-bearings. IN: Rahnejat, H. (ed). Tribology and Dynamics of Engine and Powertrain: Fundamentals, Applications and Future Trends. Woodhead Publishing Ltd, pp. 635 - 659.Publisher
© Woodhead PublishingVersion
- AM (Accepted Manuscript)
Publication date
2010Notes
This book chapter is closed access.ISBN
9781845693619Language
- en