Effect of H-DLC coatings on direct acting cam-tappet friction forces

Detalhes bibliográficos
Autor(a) principal: Ratamero, Leandro
Data de Publicação: 2022
Outros Autores: Vencovsky, Paulo
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Vetor (Online)
Texto Completo: https://periodicos.furg.br/vetor/article/view/13417
Resumo: In internal combustion engines, the valvetrain is responsible for up to 25% of the friction losses, at rotational frequencies below 2000 rpm. Important friction losses in valvetrain come from the contact between the cam and the tappet. Despite to manufacturer specifications for the engine lubricant, the lubricant viscosity can be changed under some conditions, affecting the cam-tappet contact forces. Also, the surface conditions of cam and tappet can affect these friction forces. This work presents a bench mono-valve experimental apparatus and results for frictional force investigations, using aged engine lubricant SN5W30, with viscosity modifications. The influence of a tappet crown coated with H-DLC is investigated, comparing to standard tappets. These experiments showed that, under specific experimental conditions, the friction forces between the cam and the tappet are the lowest with H-DLC application, for all lubricant viscosity applied.
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spelling Effect of H-DLC coatings on direct acting cam-tappet friction forcesEfeito dos revestimentos H-DLC nas forças de atrito came-tucho de ação diretacam-tappetfriction forcesH-DLCH-DLCCame-tuchoTrem de válvulasIn internal combustion engines, the valvetrain is responsible for up to 25% of the friction losses, at rotational frequencies below 2000 rpm. Important friction losses in valvetrain come from the contact between the cam and the tappet. Despite to manufacturer specifications for the engine lubricant, the lubricant viscosity can be changed under some conditions, affecting the cam-tappet contact forces. Also, the surface conditions of cam and tappet can affect these friction forces. This work presents a bench mono-valve experimental apparatus and results for frictional force investigations, using aged engine lubricant SN5W30, with viscosity modifications. The influence of a tappet crown coated with H-DLC is investigated, comparing to standard tappets. These experiments showed that, under specific experimental conditions, the friction forces between the cam and the tappet are the lowest with H-DLC application, for all lubricant viscosity applied.Nos motores de combustão interna, o trem de válvulas é responsável por até 25% das perdas por atrito em frequências rotacionais abaixo de 2000 rpm. Perdas importantes por atrito no trem de válvulas vêm do contato entre o came e o tucho. Apesar das especificações do fabricante para o lubrificante do motor, a viscosidade do lubrificante pode ser alterada em algumas condições, afetando as forças de contato came-tucho. Além disso, as condições da superfície do came e do tucho podem afetar essas forças de atrito. Este trabalho apresenta um aparato experimental de bancada monoválvula e resultados para investigações de força de atrito, utilizando lubrificante de motor envelhecido SN5W30, com modificações de viscosidade. A influência de uma coroa de tucho revestida com H-DLC é investigada, comparando com tucho padrão. Esses experimentos mostraram que, sob condições experimentais específicas, as forças de atrito entre o came e o tucho, quando o revestimento H-DLC é aplicado, são menores do que com o tucho padrão, para todas as viscosidades do lubrificante.Universidade Federal do Rio Grande2022-07-29info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://periodicos.furg.br/vetor/article/view/1341710.14295/vetor.v32i1.13417VETOR - Journal of Exact Sciences and Engineering; Vol. 32 No. 1 (2022); 23-30VETOR - Revista de Ciências Exatas e Engenharias; v. 32 n. 1 (2022); 23-302358-34520102-7352reponame:Vetor (Online)instname:Universidade Federal do Rio Grande (FURG)instacron:FURGenghttps://periodicos.furg.br/vetor/article/view/13417/9721Copyright (c) 2022 VETOR - Revista de Ciências Exatas e Engenhariasinfo:eu-repo/semantics/openAccessRatamero, LeandroVencovsky, Paulo 2022-07-15T17:35:53Zoai:periodicos.furg.br:article/13417Revistahttps://periodicos.furg.br/vetorPUBhttps://periodicos.furg.br/vetor/oaigmplatt@furg.br2358-34520102-7352opendoar:2022-07-15T17:35:53Vetor (Online) - Universidade Federal do Rio Grande (FURG)false
dc.title.none.fl_str_mv Effect of H-DLC coatings on direct acting cam-tappet friction forces
Efeito dos revestimentos H-DLC nas forças de atrito came-tucho de ação direta
title Effect of H-DLC coatings on direct acting cam-tappet friction forces
spellingShingle Effect of H-DLC coatings on direct acting cam-tappet friction forces
Ratamero, Leandro
cam-tappet
friction forces
H-DLC
H-DLC
Came-tucho
Trem de válvulas
title_short Effect of H-DLC coatings on direct acting cam-tappet friction forces
title_full Effect of H-DLC coatings on direct acting cam-tappet friction forces
title_fullStr Effect of H-DLC coatings on direct acting cam-tappet friction forces
title_full_unstemmed Effect of H-DLC coatings on direct acting cam-tappet friction forces
title_sort Effect of H-DLC coatings on direct acting cam-tappet friction forces
author Ratamero, Leandro
author_facet Ratamero, Leandro
Vencovsky, Paulo
author_role author
author2 Vencovsky, Paulo
author2_role author
dc.contributor.author.fl_str_mv Ratamero, Leandro
Vencovsky, Paulo
dc.subject.por.fl_str_mv cam-tappet
friction forces
H-DLC
H-DLC
Came-tucho
Trem de válvulas
topic cam-tappet
friction forces
H-DLC
H-DLC
Came-tucho
Trem de válvulas
description In internal combustion engines, the valvetrain is responsible for up to 25% of the friction losses, at rotational frequencies below 2000 rpm. Important friction losses in valvetrain come from the contact between the cam and the tappet. Despite to manufacturer specifications for the engine lubricant, the lubricant viscosity can be changed under some conditions, affecting the cam-tappet contact forces. Also, the surface conditions of cam and tappet can affect these friction forces. This work presents a bench mono-valve experimental apparatus and results for frictional force investigations, using aged engine lubricant SN5W30, with viscosity modifications. The influence of a tappet crown coated with H-DLC is investigated, comparing to standard tappets. These experiments showed that, under specific experimental conditions, the friction forces between the cam and the tappet are the lowest with H-DLC application, for all lubricant viscosity applied.
publishDate 2022
dc.date.none.fl_str_mv 2022-07-29
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://periodicos.furg.br/vetor/article/view/13417
10.14295/vetor.v32i1.13417
url https://periodicos.furg.br/vetor/article/view/13417
identifier_str_mv 10.14295/vetor.v32i1.13417
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv https://periodicos.furg.br/vetor/article/view/13417/9721
dc.rights.driver.fl_str_mv Copyright (c) 2022 VETOR - Revista de Ciências Exatas e Engenharias
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Copyright (c) 2022 VETOR - Revista de Ciências Exatas e Engenharias
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade Federal do Rio Grande
publisher.none.fl_str_mv Universidade Federal do Rio Grande
dc.source.none.fl_str_mv VETOR - Journal of Exact Sciences and Engineering; Vol. 32 No. 1 (2022); 23-30
VETOR - Revista de Ciências Exatas e Engenharias; v. 32 n. 1 (2022); 23-30
2358-3452
0102-7352
reponame:Vetor (Online)
instname:Universidade Federal do Rio Grande (FURG)
instacron:FURG
instname_str Universidade Federal do Rio Grande (FURG)
instacron_str FURG
institution FURG
reponame_str Vetor (Online)
collection Vetor (Online)
repository.name.fl_str_mv Vetor (Online) - Universidade Federal do Rio Grande (FURG)
repository.mail.fl_str_mv gmplatt@furg.br
_version_ 1797041761796751360

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