High-resolution LIF-Imaging of the oil film thickness in the piston-ring / cylinder-liner contact in an optical tribometer
| Autor: | Stefan Wigger, Sebastian A. Kaiser, Jiyeon Cheong, Hans-Jürgen Füßer |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Mechanical Engineering 02 engineering and technology Surfaces and Interfaces engineering.material 021001 nanoscience & nanotechnology Rotation Surfaces Coatings and Films Cylinder (engine) law.invention Piston Reciprocating motion 020303 mechanical engineering & transports Maschinenbau 0203 mechanical engineering Internal combustion engine Mechanics of Materials law engineering Piston ring Cast iron Composite material 0210 nano-technology Tribometer |
| Zdroj: | Tribology International. 147:106230 |
| ISSN: | 0301-679X |
| DOI: | 10.1016/j.triboint.2020.106230 |
| Popis: | An optical tribometer is developed as a model experiment for the piston-ring/cylinder-liner assembly in an internal combustion engine. The tribometer replaces the reciprocating movement of the piston rings by the steady rotation of the cylinder liner against whose inside running surface a stationary piston-ring segment from sapphire is pressed. Through this transparent ring segment, the oil-film thickness was imaged by laser-induced fluorescence of a dye added to the oil. The images clearly show various oil-filled structures of the liner surface. After an in-situ calibration and stray-light correction, the minimum film thickness was quantitatively evaluated and compared to the corresponding friction coefficient. Compared to honed cast iron, pores in a spray-coated liner retain more oil and reduce friction at higher loads. |
| Databáze: | OpenAIRE |
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