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research-article

Influence of lubricant pressure response on sub-surface stress in elastohydrodynamically lubricated finite line contacts

[+] Author and Article Information
Tobias Hultqvist

Division of Machine Elements, Department of Engineering Sciences and Mathematics, Luleå University of Technology, 971 87 Luleå, Sweden
tobias.hultqvist@ltu.se

Aleks Vrcek

Division of Machine Elements, Department of Engineering Sciences and Mathematics, Luleå University of Technology, 971 87 Luleå, Sweden
aleks.vrcek@ltu.se

Braham Prakash

Division of Machine Elements, Department of Engineering Sciences and Mathematics, Luleå University of Technology, 971 87 Luleå, Sweden
braham.prakash@ltu.se

Par Marklund

Division of Machine Elements, Department of Engineering Sciences and Mathematics, Luleå University of Technology, 971 87 Luleå, Sweden
par.marklund@ltu.se

Roland Larsson

Division of Machine Elements, Department of Engineering Sciences and Mathematics, Luleå University of Technology, 971 87 Luleå, Sweden
roland.larsson@ltu.se

1Corresponding author.

ASME doi:10.1115/1.4041733 History: Received May 15, 2018; Revised October 08, 2018

Abstract

In order to adapt to increasingly stringent CO2 regulations, the automotive industry must develop and evaluate low cost, low emission solutions in the powertrain technology. This often implies increased power density and the use of low viscosity oils, leading to additional challenges related to the durability of various machine elements. Therefore, an increased understanding of lubricated contacts becomes important where oil viscosity-pressure and compressibility-pressure behaviour have been shown to influence the film thickness and pressure distribution in EHL contacts, further influencing the durability. In this work, a finite line EHL contact is analysed with focus on the oil compressibility and viscosity behaviour, comparing two oils with relatively different pressure response and its influence on sub-surface stress concentrations in the contacting bodies. Results indicate that increased pressure gradients and pressure spikes, and therefore increased localized stress concentrations, can be expected for stiffer, less compressible oils, which does under transient loading conditions not only affect the outlet but also the edges of the roller.

Copyright (c) 2018 by ASME
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