Lubrication failure analysis of camshaft bearings in V6 diesel engine

Jingjing Zhao; Yuan Li; Liang Xie; Jinxiang Liu

doi:10.1016/j.engfailanal.2023.107329

Lubrication failure analysis of camshaft bearings in V6 diesel engine

Jingjing Zhao, Yuan Li, Liang Xie, Jinxiang Liu^*

^*Corresponding author for this work

School of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

This contribution investigates the lubrication characteristics and failure causes of camshaft bearings belong to a V6 diesel engine. Numerical simulation based on the theory of elastohydrodynamic lubrication and flexible multibody dynamics is performed to analyse the lubrication characteristics of camshaft bearings. The results reveal that lubrication performance of different bearings of camshaft shows great differences. For a certain bearing, the mixed lubrication state and elastohydrodynamic lubrication state alternately occur in one engine cycle. The duration of mixed lubrication varies greatly in different bearings. For the bearing closest to the timing drive gear, the total pressure is dominated by the asperity contact pressure, and the predicted safety factors of the asperity contact pressure, hydrodynamic pressure and oil film thickness are less than 1, which means that this bearing will have lubrication failure.

Original language	English
Article number	107329
Journal	Engineering Failure Analysis
Volume	150
DOIs	https://doi.org/10.1016/j.engfailanal.2023.107329
Publication status	Published - Aug 2023

Keywords

Asperity contact pressure
Camshaft
Lubrication failure analysis
Mixed lubrication
Safety factor

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10.1016/j.engfailanal.2023.107329

Cite this

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title = "Lubrication failure analysis of camshaft bearings in V6 diesel engine",

abstract = "This contribution investigates the lubrication characteristics and failure causes of camshaft bearings belong to a V6 diesel engine. Numerical simulation based on the theory of elastohydrodynamic lubrication and flexible multibody dynamics is performed to analyse the lubrication characteristics of camshaft bearings. The results reveal that lubrication performance of different bearings of camshaft shows great differences. For a certain bearing, the mixed lubrication state and elastohydrodynamic lubrication state alternately occur in one engine cycle. The duration of mixed lubrication varies greatly in different bearings. For the bearing closest to the timing drive gear, the total pressure is dominated by the asperity contact pressure, and the predicted safety factors of the asperity contact pressure, hydrodynamic pressure and oil film thickness are less than 1, which means that this bearing will have lubrication failure.",

keywords = "Asperity contact pressure, Camshaft, Lubrication failure analysis, Mixed lubrication, Safety factor",

author = "Jingjing Zhao and Yuan Li and Liang Xie and Jinxiang Liu",

note = "Publisher Copyright: {\textcopyright} 2023 Elsevier Ltd",

year = "2023",

month = aug,

doi = "10.1016/j.engfailanal.2023.107329",

language = "English",

volume = "150",

journal = "Engineering Failure Analysis",

issn = "1350-6307",

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T1 - Lubrication failure analysis of camshaft bearings in V6 diesel engine

AU - Zhao, Jingjing

AU - Li, Yuan

AU - Xie, Liang

AU - Liu, Jinxiang

PY - 2023/8

Y1 - 2023/8

N2 - This contribution investigates the lubrication characteristics and failure causes of camshaft bearings belong to a V6 diesel engine. Numerical simulation based on the theory of elastohydrodynamic lubrication and flexible multibody dynamics is performed to analyse the lubrication characteristics of camshaft bearings. The results reveal that lubrication performance of different bearings of camshaft shows great differences. For a certain bearing, the mixed lubrication state and elastohydrodynamic lubrication state alternately occur in one engine cycle. The duration of mixed lubrication varies greatly in different bearings. For the bearing closest to the timing drive gear, the total pressure is dominated by the asperity contact pressure, and the predicted safety factors of the asperity contact pressure, hydrodynamic pressure and oil film thickness are less than 1, which means that this bearing will have lubrication failure.

AB - This contribution investigates the lubrication characteristics and failure causes of camshaft bearings belong to a V6 diesel engine. Numerical simulation based on the theory of elastohydrodynamic lubrication and flexible multibody dynamics is performed to analyse the lubrication characteristics of camshaft bearings. The results reveal that lubrication performance of different bearings of camshaft shows great differences. For a certain bearing, the mixed lubrication state and elastohydrodynamic lubrication state alternately occur in one engine cycle. The duration of mixed lubrication varies greatly in different bearings. For the bearing closest to the timing drive gear, the total pressure is dominated by the asperity contact pressure, and the predicted safety factors of the asperity contact pressure, hydrodynamic pressure and oil film thickness are less than 1, which means that this bearing will have lubrication failure.

KW - Asperity contact pressure

KW - Camshaft

KW - Lubrication failure analysis

KW - Mixed lubrication

KW - Safety factor

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DO - 10.1016/j.engfailanal.2023.107329

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SN - 1350-6307

VL - 150

JO - Engineering Failure Analysis

JF - Engineering Failure Analysis

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Lubrication failure analysis of camshaft bearings in V6 diesel engine

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Keywords

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