Optimisation of material choice and contact surfaces of valves and inserts for heavy duty engines
Purpose and goal
The aim of the project was to find useful solutions of the wear problem of the valves and valve seat inserts and to build fundamental knowledge of the demands for a well functioning valve system for future changes. The result is a knowledge platform with understanding of the wear process and what conditions that are favourable. A doctoral thesis and several scientific papers have been published within the project.
Results and expected effects
The project has resulted in knowledge of conditions and solutions to prevent wear of the system valve and valve seat insert. The project has also resulted in improvements of the development process of the valve system. A doctoral theses has been presented within the project as well as several scientific papers.
Approach and implementation
Within the project engine run valves and vale seat inserts have been investigates in high resolution electron microscope. At the same time has the valve rig, that was built in the previous project, been adjusted to imitate real conditions in engines. Valves and valve seat inserts have been run in the rig under different conditions giving an understanding for formation and degradation of the protective tribofilms. Comparisons have been performed with engine run valves and computational programs.