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The effect of running-in on the efficiency of superfinished gears
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).ORCID iD: 0000-0002-2347-8379
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).ORCID iD: 0000-0003-2489-0688
2016 (English)In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 93, 71-77 p.Article in journal (Refereed) Published
Abstract [en]

Reduced gear contact losses are necessary to keep operating temperatures, as well as fuel consumption low. In this work, an FZG gear test rig was used to investigate the effect of running-in on superfinished gears with respect to efficiency. This was compared to ground gears where a higher contact pressure yielded higher efficiency. No difference was found between the two running-in procedures when analysing superfinished gears. The effect of running-in on gears decreased when the initial surface roughness was reduced, which initially had an Ra, Rz and Rpk value of 0.08, 0.75 and 0.08 μm respectively. Superfinished gears showed an overall higher efficiency; however, a distinctly lower efficiency was present below 2 m/s when compared to ground gears.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 93, 71-77 p.
Keyword [en]
Gear efficiency, Running-in, Superfinished, Ground
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-173902DOI: 10.1016/j.triboint.2015.08.010ISI: 000366787700010ScopusID: 2-s2.0-84942937858OAI: diva2:855865
Swedish Energy Agency

QC 20160121

Available from: 2015-09-22 Created: 2015-09-22 Last updated: 2016-01-21Bibliographically approved
In thesis
1. Running-in of gears from a surfacetransformation and efficiency point of view
Open this publication in new window or tab >>Running-in of gears from a surfacetransformation and efficiency point of view
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Requirements today for machines have moved beyond functionality intoefficiency and reliability, gears are no exception. The presented work focuseson the analysis of the measurement, evolution and effect of running-in on geardrives from a surface roughness and efficiency point of view. With no consen-sus on a definition or observation of running-in of gear drives, measurementsof both efficiency and surface transformation during the predefined running-inis explored. A verified methodology on how to separate form, waviness androughness is presented. Two finishing methods, namely generation groundand superfinished, are analyzed in terms of efficiency and surface characteris-tics as manufactured, after running-in and after efficiency testing in order todetermine the effects of load level during running-in.Results show that separation of form can be achieved with a carefullychosen polynomial, while waviness is more subject to how the user definesa cut-off wavelength for the surface roughness. Ground gears show distinctsmoothening in terms of surface roughness at high running-in load, and nogeneral trend for low load. This behavior is also reflected in the efficiencysince higher loads gave overall lower efficiency after running-in when com-pared to lower loads. Superfinished gears in contrast show no running-in ef-fects in terms of efficiency. Additionally, ground gears exhibit general changein friction and surface roughness during the first cycles of running-in whenanalyzing high load. Overall gains in efficiency can be obtained from running-in; however, at most speeds improvements from polishing a surface, in thiscase superfinishing, proved to lead to higher efficiency.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. xi, 53 p.
TRITA-MMK, ISSN 1400-1179 ; 2015:06
running-in, surface transformation, efficiency, gears, ground, su- perfinished
National Category
Research subject
Energy Technology; Machine Design
urn:nbn:se:kth:diva-173828 (URN)978-91-7595-688-6 (ISBN)
2015-10-16, Sal Gladan, Brinellvägen 85, KTH, Stockholm, 13:00 (English)
Swedish Energy Agency, 35557-1

QC 20150922

Available from: 2015-09-22 Created: 2015-09-18 Last updated: 2015-09-22Bibliographically approved

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Andersson, MartinSosa, MarioOlofsson, Ulf
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