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Revisiting Mobility-Based Predictions of Cyclic Minimum Film Thickness in Big-End Connecting Rod Bearings
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Revisiting Mobility-Based Predictions of Cyclic Minimum Film Thickness in Big-End Connecting Rod Bearings
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Journal Article
Revisiting Mobility-Based Predictions of Cyclic Minimum Film Thickness in Big-End Connecting Rod Bearings
2022
Overview
This article compares elastohydrodynamic lubrication (EHL) and mobility-based solution methods for the determination of cyclic minimum film thickness hmin
* encountered in four-stroke, big-end connecting rod bearings. Mobility-based solution methods are substantially faster than the EHL method for such bearings, so quantifying the accuracy of mobility-based methods is an obvious benefit to the engine designer. Production-level connecting rods are modeled and analyzed using an established mass-conserving mode-based EHL formulation, accounting for realistic oil feed arrangements and realistic housing deformation associated with structural inertia and surface pressures. From a large set of dimensional studies, it is observed that hmin
* calculated using mass-conserving EHL can be bounded by results obtained from finite-bearing mobility formulations, provided that a non-dimensional bearing number Λ falls below a critical value Λ
crit
≈ 4. A set of five independent validation dimensional studies supports this observation.
Publisher
SAE International,SAE International, a Pennsylvania Not-for Profit
