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Churning losses and efficiency in gearboxes
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Tribologi.
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Efficient transmissions systems are key to producing competitive motor vehicles that have a smaller environmental impact. Gears are the main components in vehicle transmissions and although they are already highly efficient, there is still room for improvement. In this study, the focus falls on the lubricant used to create separating films between gears and todissipate heat. When driving, the gears churn this lubricant, giving rise to power losses that are related to the amount and properties of the lubricant. However, any attempt to reduce these losses must not compromise the required lubrication and heat dissipation. Paper A reports on the use of an FZG gear test rig to investigate power losses and heat generation for different gear immersion depths, surface roughness and coatings. The results show that lower gear roughness reduces gear mesh losses and heat generation. A polishing affect was obtained when a non-coated gear ran against a coated gear.The aim of the research reported in paper B was to increase the accuracy of efficiency testing. It investigated how and whether repeated disassembly and re-assembly of the same test equipment, as well as test performance and rig conditions, affect the measured torque loss in an FZG gear test rig. It was shown that the measured torque loss changes between one assembly and another. Repeatability between tests is crucial for accurate conclusions.The aim of the research reported in paper C was to study whether gear efficiency could be increased by a running-in procedure, which would reduce the need for a coolant. A back-to-back gear test rig was used to test two running-in loads. Higher gear mesh efficiency was seen when a higher running-in load was used.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. , 22 p.
Series
TRITA-MMK, ISSN 1400-1179 ; 2014:11
Keyword [en]
gears, efficiency, temperature, running-in, assembly, torque loss, surface roughness
National Category
Tribology
Identifiers
URN: urn:nbn:se:kth:diva-152914ISBN: 978-91-7595-277-2 (print)OAI: oai:DiVA.org:kth-152914DiVA: diva2:752030
Presentation
2014-10-23, Sal B242, Brinellvägen 85 KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Funder
Swedish Energy Agency
Note

QC 20141006

Available from: 2014-10-06 Created: 2014-10-02 Last updated: 2014-10-06Bibliographically approved
List of papers
1.
The record could not be found. The reason may be that the record is no longer available or you may have typed in a wrong id in the address field.
2. Effect of Assembly Errors in Back-to-Back Gear Efficiency Testing
Open this publication in new window or tab >>Effect of Assembly Errors in Back-to-Back Gear Efficiency Testing
2014 (English)In: International Gear Conference 2014: 26th–28th August 2014, Lyon, Woodhead Publishing Limited, 2014, 784-793 p.Conference paper, Published paper (Refereed)
Abstract [en]

As gear efficiency is improved in small steps, it is important to be able to distinguish actual improvements from scatter that can occur while testing. An FZG back-to-back gear test rig was used to investigate how the assembly and re-assembly of the same test setup affects the measurements. A spread in loss torque between one assembly and another of the same test setup were observed. Rig conditions also affected the spread in input torque. With knowledge of how the spread in loss torque varies due to assembly, test results could be distinguished between changes due to assembly and actual differences between tests.

Place, publisher, year, edition, pages
Woodhead Publishing Limited, 2014
National Category
Tribology
Identifiers
urn:nbn:se:kth:diva-152910 (URN)10.1533/9781782421955.784 (DOI)000348383200079 ()978-1-78242-195-5 (ISBN)978-1-78242-194-8 (ISBN)
Conference
International Gear Conference, August 26-28 2014, Lyon, France
Funder
Swedish Energy Agency
Note

QC 20150706

Available from: 2014-10-02 Created: 2014-10-02 Last updated: 2017-03-10Bibliographically approved
3. A study of the running-in and efficiency of ground gears
Open this publication in new window or tab >>A study of the running-in and efficiency of ground gears
(English)Manuscript (preprint) (Other academic)
Keyword
Running-in, gears; efficiency, surface roughness
National Category
Tribology
Research subject
Machine Design
Identifiers
urn:nbn:se:kth:diva-152696 (URN)
Note

QS 2014

Available from: 2014-10-01 Created: 2014-10-01 Last updated: 2014-10-06Bibliographically approved

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Citation style
  • apa
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Output format
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