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A study on the effect of surface topography on rough friction in roller contact
Department of Production Engineering, Chalmers University of Technology, Gothenburg, Sweden.
Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.ORCID iD: 0000-0001-8058-1252
Volvo Car Corporation, Gothenburg, Sweden.
Volvo Technological Development, Gothenburg, Sweden.
2003 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 254, no 11, p. 1162-1169Article in journal (Refereed) Published
Abstract [en]

The friction behaviour of gear teeth in the context of tribology can have a strong effect on housing vibration, noise and efficiency. One of the parameters that greatly influences the friction under certain running conditions is surface roughness. In this work, rough friction was studied in lubricated sliding of roller surfaces, which were manufactured to simulate the real gear surfaces. By examining 3D surface topography of two mating bodies, both surface roughness and its effect on friction behaviour can be studied. In a previous study, a rough-friction test rig has been designed, constructed and initially verified. The types of surfaces involved in this study are ground, shot-peened, phosphated and electrochemically deburred. These rollers were subjected to the same friction testing procedures. Roller surfaces were then examined, and correlation between the topography and the frictional behaviour was analysed. Friction behaviour was interpreted in terms of Stribeck curves (friction coefficient as the function of Hersey parameter (ην/p)). The results showed that electrochemically deburred and certain phosphated surfaces provide lower friction coefficient values which are competitive to fine-ground surfaces in lubricated rolling/sliding contact. © 2003 Elsevier Science B.V. All rights reserved.

Place, publisher, year, edition, pages
Amsterdam: Elsevier, 2003. Vol. 254, no 11, p. 1162-1169
Keywords [en]
Surface Topography, Wear of materials, Friction, Rolling, Sliding mode control, Surface roughness, Tribology, Gears
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Identifiers
URN: urn:nbn:se:hh:diva-3560DOI: 10.1016/S0043-1648(03)00329-6ISI: 000185448900016Scopus ID: 2-s2.0-0042856282OAI: oai:DiVA.org:hh-3560DiVA, id: diva2:284870
Conference
10th Nordic Conference on Tribology, NORDTRIB 2002, 9-12th June, KTH, Stockholm, Sweden, 2002
Note

Funding: Volvo Car Corporation (VCC), Volvo Technological Development Corporation (VTDC) & the Swedish Board for Vehicular Research

Available from: 2010-01-08 Created: 2009-12-01 Last updated: 2018-01-12Bibliographically approved
In thesis
1. Gear tribology: friction and surface topography
Open this publication in new window or tab >>Gear tribology: friction and surface topography
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The quest for energy efficiency leads to the development of highly efficient power transmissions for vehicles. Gears are some of the most rugged and durable torque transmitters among machine elements. Friction between sliding surfaces at gear teeth is one major source of power loss. To increase efficiency and reduce damage accumulation in gears has always been a background motivation to this thesis. It focuses on the frictional performance of manufactured gear surfaces with emphasis on the effect of surface topography and the orientation of its lay.

To achieve the goal of this work, a test rig was designed and constructed. The rig makes it possible to examine gear tooth friction on double crowned rollers. Five alternative gear-finishing processes are implemented in roller surface preparation. They comprise grinding, shotpeening, phosphating, chemical deburring and DLC coating. Theoretically, a friction model is suggested which helps to explain some of the testing results. Advanced surface metrology techniques and statistical tools are implemented in identifying surface features that influence friction.

The result demonstrates that surface topography is a significant factor affecting the lubricated frictional behaviour. For ground-finishing, the smoother the surfaces are finished, the lower friction coefficient they show. Chemical deburring and DLC coating as well as certain degrees of phosphating provide minimum friction coefficient and improved load carrying capacity, which are competitive to fine-ground finishing. Properly designed lay combinations of meshing gear surfaces can minimise friction and improve gear transmission efficiency. Theoretically, the friction coefficient can be explained by means of a combination of the slide-to-roll ratio and the real mean contact pressure within the range of loads considered in this thesis. Finally, features that correlate surface topography to friction are identified.

Place, publisher, year, edition, pages
Göteborg: Chalmers university of technology, 2005. p. 46
Series
Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie, ISSN 0346-718X ; 2263
Keywords
Friction, Surface topography, Toughness, Lay, Gears, Power transmission
National Category
Engineering and Technology
Identifiers
urn:nbn:se:hh:diva-721 (URN)2082/1070 (Local ID)91-7291-581-1 (ISBN)2082/1070 (Archive number)2082/1070 (OAI)
Public defence
2005-04-08, KB Salen, K-huset, Chalmers Tekniska Högskola, Göteborg, 13:00 (English)
Opponent
Supervisors
Available from: 2007-06-11 Created: 2007-06-11 Last updated: 2018-03-23Bibliographically approved
2. Effect of rough surface anisotropy on friction in gears
Open this publication in new window or tab >>Effect of rough surface anisotropy on friction in gears
2002 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Göteborg: Chalmers tekniska högsk., 2002. p. vii, 28
Series
Thesis for the degree of licentiate of engineering, ISSN 1651-0984 ; 8
Keywords
Friction, Surface topography, Roughness, Lay, Gears, Efficiency, Power transmission
National Category
Engineering and Technology Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Identifiers
urn:nbn:se:hh:diva-1376 (URN)2082/1755 (Local ID)2082/1755 (Archive number)2082/1755 (OAI)
Presentation
(English)
Opponent
Supervisors
Note

Funding: The Swedish Board for Vehicular Research & Volvo

Available from: 2008-04-29 Created: 2008-04-29 Last updated: 2018-01-13Bibliographically approved

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Rosén, Bengt-Göran

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