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Lubrication of plastic gears
Hartl, Petr ; Čermák, Jan (referee) ; Křupka, Jiří (advisor)
The work deals with the process of lubrication of gears from a combination of materials that have significantly different material properties. The experimental measurement is performed on a tribometer in simulated gear contact with a ball-disk configuration. The Chromatic Optical Interferometry method is used to measure the formation of a lubricating film in contact. The purpose of this work is to clarify the process of film thickness formation and compare experimental measurements with predictions, which are valid in Soft EHL regime.
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Running-in of machine elements
Rejent, Pavel ; Křupka, Jiří (referee) ; Šperka, Petr (advisor)
This bachelor’s thesis deals with the effect of topography change on the running-in of a machine element. The objective was to evaluate the time change of the friction coefficient during running-in of five steel balls with different surface treatment. The experiment was performed in mixed lubrication regime. There was also a task to measure the change of surface topography after a concrete time intervals. Another task was to evaluate a fluid film thickness for every steel ball. The output of the measurement are graphs containing the time function of friction coefficient and time change of selected surface topography parameters. The change of topography was also displayed on Abbott-Firestone curves and the fluid film evaluation was compared with the predicted value. The thesis improves knowledge about running-in process and provides comparison for surface machining by three different types of sandpaper and shown change in the behaviour of machine element after lapping or polishing.
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Lubrication of plastic gears
Hartl, Petr ; Čermák, Jan (referee) ; Křupka, Jiří (advisor)
The work deals with the process of lubrication of gears from a combination of materials that have significantly different material properties. The experimental measurement is performed on a tribometer in simulated gear contact with a ball-disk configuration. The Chromatic Optical Interferometry method is used to measure the formation of a lubricating film in contact. The purpose of this work is to clarify the process of film thickness formation and compare experimental measurements with predictions, which are valid in Soft EHL regime.
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Running-in of machine elements
Rejent, Pavel ; Křupka, Jiří (referee) ; Šperka, Petr (advisor)
This bachelor’s thesis deals with the effect of topography change on the running-in of a machine element. The objective was to evaluate the time change of the friction coefficient during running-in of five steel balls with different surface treatment. The experiment was performed in mixed lubrication regime. There was also a task to measure the change of surface topography after a concrete time intervals. Another task was to evaluate a fluid film thickness for every steel ball. The output of the measurement are graphs containing the time function of friction coefficient and time change of selected surface topography parameters. The change of topography was also displayed on Abbott-Firestone curves and the fluid film evaluation was compared with the predicted value. The thesis improves knowledge about running-in process and provides comparison for surface machining by three different types of sandpaper and shown change in the behaviour of machine element after lapping or polishing.
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