This paper deals with the friction forces between NBR-(acrylonitrile butadiene rubber) lip seal and piston rod for an automotive strut respectively shock absorber. The tribological modelling tram the application to the tribological contact is presented as well as a test bench development that enables the measurement of seal friction force depending on the direction of motion under different pressure loads. The relative motion between rod and seal starts as impact without acceleration phase. The influence of higher pressure loads on the friction force level and the run of the friction force curves is distinguished with common chrome plated piston rods. The investigation of friction forces between a NBR lip seal and gas nitrided piston rods with different topograhies from super-finished to mirror-like quality shows that smoother surfaces do not consequently mean less friction forces for all operating states. The reduction of roughness enlarges the real contact area so that more micro contacts between the tribological contact bodies can theoretically exist. Even small local contact forces lead to a higher resistance against separating of the contact bodies surfaces with higher deformation rates and finally higher friction forces as consequence. The static and dynamic modification of the real contact area has got a dominant influence on friction forces. Additionally, a mechanical cramping of the seal in micro cavities can be assumed for ceramic spray coated surfaces and verified for laser textured sealing contacts in this paper. In contrast to tribological sealing systems with hard contact materials like metals or ceramics the micro texturing of a rod in a polymer sealing contact let the friction force increase. In-situ measurements of the cross section dimensions of a NBR seal in an experimental model can prove and stress the influence of seal deformation under relative motion for polished and laser textured rod surfaces. It is accented that a reduction of friction forces for automotive struts can not be achieved by mirror-like rod polishing or laser texturing in combination with NBR compact lip seals.


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    Titel :

    Influence piston rod topography on seal friction force


    Weitere Titelangaben:

    Einfluss der Kolbenstangentopographie auf die Dichtungsreibung


    Beteiligte:


    Erscheinungsdatum :

    2004


    Format / Umfang :

    12 Seiten, 15 Bilder, 6 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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