Valve-seat components in a diesel engine: a tribological approach to limit wear

Within diesel engines, the valve-seat contact is one of the few non-lubricated contacts which is subjected to significant degradation. This degradation is put in evidence by material removal at the intake valve. The material pull out is promoted by the replication of combustion cycles (500 million)...

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Autores principales:	Crozet Martial, Berthier Yves, Saulot Aurélien, Jones David, Bou-Saïd Benyebka
Formato:	article
Lenguaje:	EN
Publicado:	EDP Sciences 2021
Materias:	non lubricated contact wear engine tribological triplet material flows Materials of engineering and construction. Mechanics of materials TA401-492
Acceso en línea:	https://doaj.org/article/8976d4aad28b4595b97cc787b3c5ccfe
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spelling	oai:doaj.org-article:8976d4aad28b4595b97cc787b3c5ccfe2021-11-08T15:20:55ZValve-seat components in a diesel engine: a tribological approach to limit wear2257-77772257-775010.1051/meca/2021043https://doaj.org/article/8976d4aad28b4595b97cc787b3c5ccfe2021-01-01T00:00:00Zhttps://www.mechanics-industry.org/articles/meca/full_html/2021/01/mi210081/mi210081.htmlhttps://doaj.org/toc/2257-7777https://doaj.org/toc/2257-7750Within diesel engines, the valve-seat contact is one of the few non-lubricated contacts which is subjected to significant degradation. This degradation is put in evidence by material removal at the intake valve. The material pull out is promoted by the replication of combustion cycles (500 million) and severe operating conditions (pressure 18 MPa). The wear can lead to gas leakage and engine failure. The target of this work was to identify the main parameters affecting this wear. Our approach was based on the tribological triplet and material flows within the contact involving both numerical and experimental approaches. A dynamic model and a valvetrain test bench showed that the wear flows could be activated by the architecture of the valve opening system. Consequently, the limitation of these flows can be obtained by controlling the “global” geometry of the system and therefore without modifying the properties of the materials. In the same way, a finite element model of the local response of the seat-valve contact highlighted the impact of the “local” geometry of the contact. The change of this geometry is a lever to limit the shearing forces which reduces the tearing of the particles and therefore wear. Finally, tests carried out on the engine and on a specifically adapted test bench completed the understanding of degradation mechanisms (source flow, wear flow, etc.). Morphological interpretations of worn surfaces in terms of material flows allowed the understanding of the build-up stages of a protective layer. One solution to promote this internal flow is the use of pollutants from combustion. For example, the burned oil in contact, which is a priori harmful, becomes an opportunity here. In addition, un-burned hydrocarbons from the combustion of biodiesel help to protect the contact.Crozet MartialBerthier YvesSaulot AurélienJones DavidBou-Saïd BenyebkaEDP Sciencesarticlenon lubricated contactwearenginetribological tripletmaterial flowsMaterials of engineering and construction. Mechanics of materialsTA401-492ENMechanics & Industry, Vol 22, p 44 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	non lubricated contact wear engine tribological triplet material flows Materials of engineering and construction. Mechanics of materials TA401-492
spellingShingle	non lubricated contact wear engine tribological triplet material flows Materials of engineering and construction. Mechanics of materials TA401-492 Crozet Martial Berthier Yves Saulot Aurélien Jones David Bou-Saïd Benyebka Valve-seat components in a diesel engine: a tribological approach to limit wear
description	Within diesel engines, the valve-seat contact is one of the few non-lubricated contacts which is subjected to significant degradation. This degradation is put in evidence by material removal at the intake valve. The material pull out is promoted by the replication of combustion cycles (500 million) and severe operating conditions (pressure 18 MPa). The wear can lead to gas leakage and engine failure. The target of this work was to identify the main parameters affecting this wear. Our approach was based on the tribological triplet and material flows within the contact involving both numerical and experimental approaches. A dynamic model and a valvetrain test bench showed that the wear flows could be activated by the architecture of the valve opening system. Consequently, the limitation of these flows can be obtained by controlling the “global” geometry of the system and therefore without modifying the properties of the materials. In the same way, a finite element model of the local response of the seat-valve contact highlighted the impact of the “local” geometry of the contact. The change of this geometry is a lever to limit the shearing forces which reduces the tearing of the particles and therefore wear. Finally, tests carried out on the engine and on a specifically adapted test bench completed the understanding of degradation mechanisms (source flow, wear flow, etc.). Morphological interpretations of worn surfaces in terms of material flows allowed the understanding of the build-up stages of a protective layer. One solution to promote this internal flow is the use of pollutants from combustion. For example, the burned oil in contact, which is a priori harmful, becomes an opportunity here. In addition, un-burned hydrocarbons from the combustion of biodiesel help to protect the contact.
format	article
author	Crozet Martial Berthier Yves Saulot Aurélien Jones David Bou-Saïd Benyebka
author_facet	Crozet Martial Berthier Yves Saulot Aurélien Jones David Bou-Saïd Benyebka
author_sort	Crozet Martial
title	Valve-seat components in a diesel engine: a tribological approach to limit wear
title_short	Valve-seat components in a diesel engine: a tribological approach to limit wear
title_full	Valve-seat components in a diesel engine: a tribological approach to limit wear
title_fullStr	Valve-seat components in a diesel engine: a tribological approach to limit wear
title_full_unstemmed	Valve-seat components in a diesel engine: a tribological approach to limit wear
title_sort	valve-seat components in a diesel engine: a tribological approach to limit wear
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/8976d4aad28b4595b97cc787b3c5ccfe
work_keys_str_mv	AT crozetmartial valveseatcomponentsinadieselengineatribologicalapproachtolimitwear AT berthieryves valveseatcomponentsinadieselengineatribologicalapproachtolimitwear AT saulotaurelien valveseatcomponentsinadieselengineatribologicalapproachtolimitwear AT jonesdavid valveseatcomponentsinadieselengineatribologicalapproachtolimitwear AT bousaidbenyebka valveseatcomponentsinadieselengineatribologicalapproachtolimitwear
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Valve-seat components in a diesel engine: a tribological approach to limit wear

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