Work

Assessment of main bearing displacements in the monoblock of a commercial common rail diesel engine

Year: 2025

Type: article

Abstract: This study investigates the structural behavior of the monoblock crankcase of a commercial common rail diesel engine, with a specific focus on the displacements of main bearing housings under realistic operating conditions. A detailed reverse engineering approach was employed to reconstruct the crankcase geometry, followed by finite element simulations of critical load cases derived from combustion pressure and inertial dynamics. The mechanical design criteria of crankcases and hydrodynamic bearing systems are reviewed to define acceptable tolerance ranges and deformation limits. Stress and displacement analyses were conducted across multiple engine operating scenarios to identify critical regions and evaluate the structural integrity of the engine block. Results indicate that the most significant bearing misalignments occur at central supports, suggesting potential areas for reinforcement or design improvement. The findings support the application of precise manufacturing techniques and modular design philosophies to ensure bearing alignment and engine reliability.

Source: Applications in Engineering Science

DOI: 10.1016/j.apples.2025.100254

Authors: Luca Piancastelli, Irene Giusti, Marella De Santis, Gian Maria Santi

Institution: University of Bologna

Language: English

Topic: Engineering Applied Research

Subfield: Civil and Structural Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: gold

Estimated APC paid: $2,420