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A study on diesel engine crankshaft bearing failure analysis with consideration of bearing lubrication

Qi Liu (Naval Research Institute of PLA, Beijing, China)
Baiqi Huo (Naval Research Institute of PLA, Beijing, China)
Yunsheng Liu (Naval Research Institute of PLA, Beijing, China)
Junchao Zhu (Energy and Power Engineering, Jiangsu University of Science and Technology, Zhenjiang, China)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Article publication date: 4 January 2022

Issue publication date: 21 January 2022

291

Abstract

Purpose

The edge of diesel engine crankshaft main bearing is more likely to fail in its real working condition. This paper aims to study the bearing failure mechanism by finding the relationship between bearing lubrication characteristics and its working condition.

Design/methodology/approach

This work builds the mixed lubrication model of crankshaft bearing to analyze the cause of bearing abnormal wear, and the finite difference method was used to solving the average Reynolds equation. During the analysis, journal misaligned angle, external load and roughness are considered.

Findings

The result shows that the wear of the diesel engine crankshaft bearing happens in engine startup phase and the bottom of the bearing are more prone to be excessively worn. Under the influence of journal misalignment, bearing asperity contact load and speed range of mixed lubrication will increase markedly. The edge of the bearing will be excessively worn. The effect of misalignment on bearing lubrication performance varies under different shaft rotation speed.

Originality/value

The former research studies on crankshaft bearing either just focused on its lubrication characteristics or interested in its failure types (wear, adhere, cavitation). This paper studies the relationship between bearing failure mechanism and lubrication performance.

Keywords

Citation

Liu, Q., Huo, B., Liu, Y. and Zhu, J. (2022), "A study on diesel engine crankshaft bearing failure analysis with consideration of bearing lubrication", Industrial Lubrication and Tribology, Vol. 74 No. 1, pp. 118-126. https://doi.org/10.1108/ILT-06-2021-0231

Publisher

:

Emerald Publishing Limited

Copyright © 2021, Emerald Publishing Limited

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