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Open AccessArticle

Numerical Study of Power Loss and Lubrication of Connecting Rod Big-End

Department of Mechanical and Aerospace Engineering, Politecnico di Torino, 10129 Torino, Italy
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Lubricants 2019, 7(6), 47; https://doi.org/10.3390/lubricants7060047
Received: 10 April 2019 / Revised: 19 May 2019 / Accepted: 29 May 2019 / Published: 1 June 2019
(This article belongs to the Special Issue Tribology of Powertrain Systems)
A hydrodynamic lubrication analysis for connecting rod big-end bearing is conducted. The effects of engine speed, operating condition, lubricant viscosity and oil temperature on tribological performance of big-end bearing have been examined. Force equilibrium is solved to define instantaneous eccentricity between journal and bearing to have accurate estimation of oil film thickness at interface of connecting rod big-end bearing and crankpin. Connecting rod big-end is treated as π film hydrodynamic journal bearing and finite difference scheme is applied to calculate generated hydrodynamic pressure and frictional power loss at each crank angle. Beside the development of analytical formulation, well-known Mobility model introduced by Booker has been employed to be compared with the analytical model. The presented analytical model reduces the complexity and the numerical effort with respect to Mobility method, thus shortening the computation time. The simulation results show good agreement between analytical model, Mobility approach and experimental data. View Full-Text
Keywords: connecting rod; tribology; hydrodynamic lubrication; big-end bearing connecting rod; tribology; hydrodynamic lubrication; big-end bearing
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Razavykia, A.; Delprete, C.; Baldissera, P. Numerical Study of Power Loss and Lubrication of Connecting Rod Big-End. Lubricants 2019, 7, 47.

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