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In situ surface characterization of running-in of involute gears
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: 0000-0002-2578-9453
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).ORCID iD: 0000-0003-2489-0688
2015 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577Article in journal (Refereed) Published
Abstract [en]

Gear life and operation are largely determined by the properties of the contacting surfaces, which inevitably change over the gear life. The initial topography transformation, a characteristic effect of running-in, is very important. This paper focuses on how the running-in of the surface topography can be characterized and what methodology can be used for this purpose. To characterize running-in, gears were run in an FZG back-to-back test rig and the changes in surface topography were measured in situ using a Form Talysurf Intra. This enables the same gear tooth surface to be measured with enough precision to follow its development through the different stages of running-in. Gear tooth surfaces as manufactured were measured on three occasions: in initial manufactured condition, after a standard running-in procedure, and after an efficiency test. Running-in was characterized both qualitatively by plotting roughness profiles and quantitatively by analyzing a selected set of roughness parameters. This paper demonstrates that: the asperity peaks were worn off in the initial running-in stage; roughness, waviness, and form can be separated using a carefully chosen polynomial fit and the Gaussian filter; surface topography can be examined initially, after running-in, and after operation in situ; and complete wear of the initial surface can be observed in specific circumstances.

Place, publisher, year, edition, pages
Keyword [en]
Gear manufacture, Gear teeth, Gears, Topography, Back-to-back tests, Contacting surfaces, Different stages, Form removal, Gear tooth surface, In-situ surface characterizations, Roughness parameters, Running-in, Surface topography
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-173897DOI: 10.1016/j.wear.2015.03.008ScopusID: 2-s2.0-84925742642OAI: diva2:855780

QP 201509

Available from: 2015-09-22 Created: 2015-09-22 Last updated: 2015-09-22Bibliographically 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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Sosa, MarioBjörklund, StefanSellgren, UlfOlofsson, Ulf
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