izvorni znanstveni rad
In this paper, comparative laboratory tests of vibrations, noise level, and wear were performed on three inner rings of the needle bearing made of 100Cr6 steel that were in the unmodified state, plasma nitrided or coated with a PACVD TiN coating. The tested rings were driven inside the bearing housing with the same outer ring and needle rollers. Rings were tested by bearing rotation in idle mode without the use of lubrication at a speed of rotation of 950 rpm for a duration of 5 minutes, during which the amplitude and the basic frequency of vibrations, noise level, and bearing temperature were recorded. An analysis of the surface of the inner ring revealed damage from surface fatigue, adhesion, and abrasion, depending on the previous surface heat treatment. The appearance of those wear processes caused a specific vibration pattern, changes in the
vibration intensity and spectre of the vibration noise, and an increase in bearing temperature.
needle bearing; plasma nitriding; PACVD TiN; surface fatigue; vibrations
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