The careful design of engine main bearings can significantly reduce friction losses while maintaining high reliability, which is very valuable for reducing emissions of commercial vehicles. Simulation analysis based on high-precision models can provide effective means for achieving this goal. Therefore, a comprehensive model considering elasto-hydrodynamic lubrication and tribo-dynamics of the main bearing-crankshaft system is built in this study, and the effectiveness of the model is verified through an online ultrasonic measurement of oil film thickness. Then, the potential design improvement solutions are analyzed for the main bearing of a commercial vehicle engine. The results indicate that there is still an opportunity for optimizing the design of engine main bearings. This study can provide an effective method for the low friction design of commercial vehicle engines.
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