Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • 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
Structural and tribological analysis of harvester crane joint
Luleå University of Technology, Department of Engineering Sciences and Mathematics.
2018 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Grease-lubricated journal bearings are widely used in heavy duty applications, such as construction equipment, agriculture- and forest machines. The main purpose of the grease-lubricated journal bearing is solely to create sustainable rotation of a given application. However, purpose seldom decides complexity of journal bearing design. Depending on application, parameters such as Load , Material  and Lubrication immensely increase complexity of the design. Tribology is a highly interdisciplinary subject, which requires knowledge concerning physics, chemistry, metallurgy and solid mechanics. Tribological aspects of a design are frequently regarded as irrelevant. Tribological issues are commonly enlightened in combination with structural design weaknesses.

The main aim of the thesis was to analyze two cylinder joints found in a Komatsu Forest 951 crane and establish root cause to the structural and tribological issues. Outline of the approach was divided into three main targets:

1. Investigate mechanical and tribological aspects of the crane design.

2. Understand how these aspects influence the life time of the bearings.

3. Summarize the analysis and suggest improvements based on the discovery.

Fundamental structural and tribological design guidelines regarding grease-lubricated journal bearings have been presented in this thesis. Damaged components such as cylinders, pins and journal bearings have been examined at Komatsu Forest’s factory in Umeå. Further, a scanning electron microscopy study has been done at Luleå University of Technology, to determine predominant wear mechanisms in the harvester crane joints. A non-linear finite element model of the crane has been designed to represent pressure distribution in the contact between bearing and pin. The finite element analysis gives a good approximation of the contact but leaves room for further refinements. Temperatures, in the contacts, have not been identified and will be measured outside the time frame of the master’s thesis. Design changes, with respect to discovered structural and tribological issues have been suggested. The suggested improvements can potentially increase the life time of lift cylinders, pins and journal bearings.

Place, publisher, year, edition, pages
2018. , p. 68
Keywords [en]
Forest machine, Harvester, Grease-lubricated journal bearing, Lubrication, Contact mechanics, Wear, Friction, Finite element
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Identifiers
URN: urn:nbn:se:ltu:diva-69653OAI: oai:DiVA.org:ltu-69653DiVA, id: diva2:1220496
External cooperation
Komatsu Forest AB
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Supervisors
Examiners
Available from: 2018-06-20 Created: 2018-06-18 Last updated: 2018-06-20Bibliographically approved

Open Access in DiVA

fulltext(46826 kB)11 downloads
File information
File name FULLTEXT01.pdfFile size 46826 kBChecksum SHA-512
40e3c7701d84c8f8a7ca76cb73367e9d299b7927a1b505656e402dbcf25e4974b891750f3d7ce746b3891ea9218fe5233ecbb5d0bb197951dcb6f7c57b593131
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Hedström, Gabriel
By organisation
Department of Engineering Sciences and Mathematics
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)

Search outside of DiVA

GoogleGoogle Scholar
Total: 11 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 45 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • 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