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Tribological performance of different crankshaft bearings in conjunction with textured shaft surfaces
Luleå University of Technology, Department of Engineering Sciences and Mathematics.
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Improving vehicle efficiency and complying to stricter exhaust emission legislations are some of the driving factors to advancement in technology of engine components. The main bearings in an internal combustion engine contribute significant amount of friction. These bearings support engine loads and allow free rotation of the crankshaft. The bearings consist of a steel backing, a lining material and an optional overlay. The overlays help to minimize friction and enhance seizure resistance during adverse operating conditions.

The aim of the thesis is to study the friction and wear performance of five multi-layered bearings with various overlays. A bi-metal bearing is used as the reference for comparison. Additionally, influence of two shaft surface textures are also studied comparing to the standard shaft surface finish.

A modified twin-disc test rig is used to evaluate tribological performance of the bearing system. Forced misalignment tests were also performed to simulate edge contact conditions, which occur in an engine due to shaft deflection, asymmetrical loading and other factors. The bearing surface profiles were measured using an optical interferometer.

The test setup showed good repeatability and consistent results. Relative friction and wear performance are compared and the bearings are ranked accordingly. One bearing type with a polymer and MoS2 overlay showed the best overall performance. This bearing combined with a plateau textured shaft further lowered the friction coefficient by 3 % in boundary and mixed lubrication regime.

Place, publisher, year, edition, pages
2017. , p. 61
Keyword [en]
Tribology, journal bearings, engine main bearings, automotive, friction, wear
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Identifiers
URN: urn:nbn:se:ltu:diva-65511OAI: oai:DiVA.org:ltu-65511DiVA, id: diva2:1138682
External cooperation
Volvo Car Company
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level (120 credits)
Supervisors
Examiners
Available from: 2017-09-07 Created: 2017-09-06 Last updated: 2018-01-13Bibliographically approved

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Tamatam, Lakshminarayana Reddy
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CiteExportLink to record
Permanent link

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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf