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Scuffing resistance of gear surfaces: influence of manganese phosphate and lubricants
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Elements. KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Tribologi.
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Elements.
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Elements. KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Tribologi.ORCID iD: 0000-0003-2489-0688
(English)Manuscript (preprint) (Other academic)
Keyword [en]
gears, scuffing, lubrication, case-hardened steel, manganese phosphate
National Category
Mechanical Engineering Tribology
Research subject
Machine Design
Identifiers
URN: urn:nbn:se:kth:diva-152698OAI: oai:DiVA.org:kth-152698DiVA: diva2:751474
Note

QS 2015

Available from: 2014-10-01 Created: 2014-10-01 Last updated: 2015-02-23Bibliographically approved
In thesis
1. Influence of running-in on gear efficiency
Open this publication in new window or tab >>Influence of running-in on gear efficiency
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The general trend in gear industry is an increased focus on gear transmission efficiency. This thesis focuses on the understanding of how different gear manufacturing methods – particularly the contribution of the running-in process – affect the surface characteristics and friction response, with the purpose of increasing gearbox efficiency. The thesis consists of a summary and five appended papers.

The research hypothesis in paper A and paper B was that the dry elastic contact area ratio is a descriptive parameter for the contact condition. Paper A deals with the influence of manufacturing method on the initial contact conditions. The emphasis in paper B is the changes that occur during running-in and correlating these changes to design requirements. Paper C examines the influence of manganese phosphate coating and lubricants, with respect to friction and the risk of scuffing at the initial contact. Paper D examines the effect of running-in load on the friction response for different surfaces. In paper E, the question of whether the load during running-in influences the gear mesh efficiency is further expounded.

The main conclusions of this thesis are that the running-in influences the gear mesh efficiency; a high running-in load enhances the gear mesh efficiency. The difference in mesh efficiency is in the range of one tenth of a per cent. Thus, the influence of running-in cannot be neglected because it is in the same order of magnitude as reported for other gear efficiency enhancements. Furthermore, the dry elastic contact area ratio presents a descriptive measure of how surface topography influences the contact, at both a global (form deviation) and local (roughness) level. The surface topography caused by the manufacturing method has a significant influence on the contact area ratio. Shaving was found to have the highest contact area ratio, and would therefore be the best choice if deviations from case hardening could be minimised. It was also confirmed that surfaces coated with manganese phosphate raise the limiting load for scuffing failure up to 13 times compared to the uncoated ground equivalent.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. 56 p.
Series
TRITA-MMK, ISSN 1400-1179 ; 2014:09
Keyword
gears; gear manufacturing; running-in; efficiency, friction, surface topography
National Category
Tribology
Research subject
Machine Design
Identifiers
urn:nbn:se:kth:diva-152699 (URN)978-91-7595-258-1 (ISBN)
Public defence
2014-10-24, Sal B242, Brinellvägen 83, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20141002

Available from: 2014-10-02 Created: 2014-10-01 Last updated: 2014-10-02Bibliographically approved

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Olofsson, Ulf

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