Wear mechanism study of intake valve system in modern heavy duty combustion engines
2014 (English)Conference paper, Abstract (Other academic)
At the present time, there is an increasing demand on higher efficiency, a longer operational life, and lower amounts of emissions for heavy duty combustion engines. This puts a lot of strain on the different components of the engine, not least the valve and valve seat insert, which operate in direct contact with the combustion chamber. A low wear rate is needed to maintain their sealing and performance abilities, but the design is often a compromise in between high efficiency and low wear rate. At the same time, the sealing surfaces see less and less particulates generated in the engine due to harder environmental legislations which may hinder the formation of protective tribofilms. these changes are expected to change the wear rates of the valve sealing interfaces rapidly.
In this study, intake valves and valve seat inserts from three different engines have been analyzed. The samples come from two field engines and a cell test and differ in effect, operating time, fuel, and environmental legislation class. The valve sealing surfaces have been examined with high resolution electron microscopy and surface analysis in order to analyze and establish the possible wear mechanisms and presence of protective tribofilms. The results will be presented and their implication with regard to future valve systems will be discussed.
Place, publisher, year, edition, pages
Engineering and Technology
Research subject Engineering Science with specialization in Materials Science
IdentifiersURN: urn:nbn:se:uu:diva-244268OAI: oai:DiVA.org:uu-244268DiVA: diva2:788340
Asiatrib, Agra, February 17-20, 2014