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Wet clutch transmission fluid for AWD differentials: base fluid influence on friction characteristics
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
Statoil Lubricants R&D, Nynäshamn.
Haldex Traction Systems AB.
2006 (English)In: TriboTest Journal, ISSN 1354-4063, Vol. 12, no 1, p. 47-56Article in journal (Refereed) Published
Abstract [en]

During the past few years several electronically controllable automotive transmission systems, where wet clutches are used as intelligent differentials, have emerged in the market. In this type of application the anti-shudder properties of the lubricants are of vital importance. This paper investigates the influence of base fluids on the anti-shudder properties of transmission fluids for wet clutches in all-wheel-drive systems. The investigated all-wheel-drive system featuring a wet multi-plate clutch with a sintered brass-based friction material is described. The test equipment used to determine the frictional characteristics of the transmission fluid is described. The parameters studied include base fluid type and base fluid viscosity. It is shown that the choice of base fluid has no impact on torque capacity, but that the base fluid influences the temperature dependence of the dynamic friction and the anti-shudder properties. It is also shown that the major effect on the friction characteristics is caused by additive effects rather than base fluid effects.

Place, publisher, year, edition, pages
2006. Vol. 12, no 1, p. 47-56
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-6062Local ID: 443dd540-038c-11dc-8b31-000ea68e967bOAI: oai:DiVA.org:ltu-6062DiVA, id: diva2:978939
Note

Godkänd; 2006; 20070516 (cira)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-02-26Bibliographically approved

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Mäki, Rikard

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