Reduzierung der Festkörperreibung eines Kraftfahrzeugmotors
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Inhaltsangabe: Einleitung: Bei bekannten Kraftfahrzeugmotoren wird der Schmierölhaushalt von einer vom Verbrennungsmotor angetriebenen Ölförderpumpe gewährleistet. Da der Schmierölförderdruck von der Drehzahl des Verbrennungsmotors abhängig ist, wirkt sich die Start- und Auslaufphase des Motors ungünstig auf das Schmierverhalten aus und es treten Verschlei erscheinungen auf. Eine elektrisch betriebene Ölförderpumpe hat in dieser Diplomarbeit für Abhilfe geschaffen. Der erforderliche Schmieröldruck wurde vor dem Starten des Motors erzeugt und beim Auslaufen des Triebwerks entsprechend lang erhalten, um den Verschlei im Motor zu reduzieren. Im Rahmen dieser Diplomarbeit wurde ein neu konstruiertes, elektrisch betriebenes Schmierölsystem gefertigt und an einem von Mercedes-Benz gestifteten Ottomotor der Baureihe M111 E23 im Prüfstandsbetrieb erprobt. Hierbei haben sich zudem beachtliche Veränderungen in Bezug auf den Wirkungsgrad, den Kraftstoffverbrauch und den Motorverschlei ergeben. Untersuchungen wurden bei unterschiedlicher Viskosität/Temperatur des Schmiermediums, sowie unterschiedlichen Lastzuständen des Motors durchgeführt. Ebenso ist untersucht worden, ob der Einbau einer elektrischen Pumpe zu einer Gesamtwirkungsgradverbesserung des Motors führt, da die drehzahlabhängige mechanische Ölpumpe den überschüssigen, direkt in die Ölwanne zurückführenden Ölstrom erwärmt. Gesponsert wurde die elektrische Ölpumpe von der Pumpenfabrik STOZ GmbH Weingarten, welche über umfangreiches Wissen und Erfahrung auf dem Hydrauliksektor verfügt. Inhaltsverzeichnis: Inhaltsverzeichnis: 1.Verzeichnisse2 1.1Inhaltsverzeichnis2 1.2Abbildungsverzeichnis6 1.3Verzeichnis der Diagramme8 1.4Verzeichnis der Tabellen8 2.Einleitung und Grundlagen9 2.1Vorwort9 2.2Beschreibung der Diplomarbeit10 2.3Allgemeine Grundlagen10 2.3.1Die Probleme mit der Reibung10 2.3.2Probleme während der Startphase des Verbrennungsmotors10 2.3.3Probleme während der Auslaufphase12 2.3.4Probl
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