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A traction coefficient formula for EHL line contacts operating in the linear isothermal region
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements. DENSO CORPORATION, 1–1 Showa-Cho, Kariya-shi, Aichi, 448–8661, Japan.ORCID iD: 0000-0002-9819-344X
DENSO CORPORATION, 1–1 Showa-Cho, Kariya-shi, Aichi, 448–8661, Japan.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0002-4271-0380
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0001-7029-1112
2023 (English)In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 180, article id 108216Article in journal (Refereed) Published
Abstract [en]

Many mechanical products including rolling/sliding parts are used with various lubricants and operating conditions. Increasing the efficiency and reliability of products requires an essential understanding of the traction characteristics of the rolling/sliding parts. Many researchers have investigated the traction characteristics of rolling/sliding EHL contacts considering shear-thinning, thermal effects, and roller compliance. There are, however, only a few papers concerning the modeling of traction characteristics in the linear isothermal region at low slide-to-roll ratios. We propose a prediction formula for the dimensionless traction coefficient for EHL line contacts in the linear isothermal region. The formula was obtained by numerical simulations using a fully-coupled finite-element EHL line contact solver, and it is applicable for the piezoviscous rigid/elastic, and the isoviscous rigid/elastic regimes.

Place, publisher, year, edition, pages
Elsevier Ltd , 2023. Vol. 180, article id 108216
Keywords [en]
EHL, FEM, Friction, Lubrication, Machine Element, Modelling, Rolling/sliding, Traction
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-95492DOI: 10.1016/j.triboint.2023.108216ISI: 001000351600001Scopus ID: 2-s2.0-85146236992OAI: oai:DiVA.org:ltu-95492DiVA, id: diva2:1733878
Funder
Luleå University of Technology
Note

Validerad;2023;Nivå 2;2023-02-03 (sofila);

Funder: DENSO CORPORATION

Available from: 2023-02-03 Created: 2023-02-03 Last updated: 2024-03-07Bibliographically approved
In thesis
1. Prediction of traction in EHL contacts operating in the linear isothermal region
Open this publication in new window or tab >>Prediction of traction in EHL contacts operating in the linear isothermal region
2024 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The vehicle industry plays an important role in moving people and goods all over the world. Unfortunately, the vehicular transportation has a huge (negative) impact on the climate. Improved fuel-efficient vehicle technologies are therefore required to reduce emissions and address environmental concerns. The introduction of alternative fuels and the use of high-pressure fuel injection systems in vehicle engines are some of the approaches that are employed to enhance the fuel efficiency of automobiles. However, in the case of high-pressure fuel injection systems, the tribological interfaces such as those of cam–roller followers are subjected to severe operating conditions (including high contact pressures and sliding motion) and consequently high frictional losses and risk of wear-related failures. 

This thesis’s objective is to establish a prediction formula for the traction coefficient slope to analyze the motion of the roller follower. This prediction formula is derived based on numerical calculations performed using a fully-coupled finite-element based model of the elliptical elastohydrodynamically lubricated contact specifically designed for operational conditions within the isothermal linear regime.

Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2024
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
Keywords
Elastohydrodynamic lubrication (EHL), Friction, Traction, Modelling, Simulation, FEM, Rolling/sliding, Elliptical
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-104217 (URN)978-91-8048-482-4 (ISBN)978-91-8048-483-1 (ISBN)
Public defence
2024-03-14, E632, Luleå University of Technology, Luleå, 09:00 (English)
Opponent
Supervisors
Available from: 2024-02-07 Created: 2024-02-07 Last updated: 2024-03-23Bibliographically approved

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Higashitani, YukoBjörling, MarcusAlmqvist, Andreas

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