Der Antrieb fr das Stadtauto von morgen - Schffler und Ford zeigen Ideenauto mit E-Wheel Drive
11/04/2013
Der Antrieb f r das Stadtauto von morgen Schaeffler und Ford zeigen Ideenauto mit E-Wheel Drive
Im Rahmen des auto, motor und sport -Kongresses stellt Schaeffler seinen elektrischen Radnabenantrieb Schaeffler E-Wheel Drive vor. Gezeigt wird der innovative Elektroantrieb in einem in Kooperation mit Ford realisierten Entwicklungsfahrzeug auf Basis eines Ford Fiesta. Angetrieben wird das Kompaktfahrzeug mittels zweier in den hinteren Radh usern verbauten Schaeffler E-Wheel Drive. Dabei handelt es sich um hochintegrierte Radnabenantriebe, bei denen s mtliche f r Antrieb, Verz gerung und Fahrsicherheit notwendigen Bauelemente wie Elektromotor, Leistungselektronik und Controller, Bremse sowie K hlung Platz innerhalb der Felge finden.
Die technischen Eckdaten liegen bei bis zu 40 kW pro Antrieb, beziehungsweise einer Dauerleistung von zweimal 33 kW. Das entspricht in traditioneller Lesart bis zu 110, beziehungsweise 90 Pferdest rken. Dabei liefert der fl ssigkeitsgek hlte Radnabenantrieb der zweiten Entwicklungsstufe (Beta) ein Drehmoment von bis zu 700 Nm. Damit verf gt der aktuelle Radnabenantrieb E-Wheel Drive Beta gegen ber dem im Jahr 2010 im Schaeffler-Ideenfahrzeug Schaeffler Hybrid (auf Basis eines Opel Corsa) gezeigten Radnabenmotor der ersten Generation (Alpha) ber ein Drittel mehr Leistung und ein um 75 Prozent h heres Drehmoment. Die elektrische Spannung des Hochvoltantriebs betr gt 360 - 420 Volt.
Mit insgesamt 53 Kilogramm betr gt das Mehrgewicht des hochintegrierten Radnabenantriebs gegen ber einem herk mmlichen Rad mit Radlager und Bremse 45 Kilogramm. Das Bauvolumen von 16 Liter findet Platz in einer 16-Zoll-Felge. Gegen ber dem Radnabenmotor der Generation Alpha, bei dem die Leistungselektronik noch im Fahrzeug verbaut war, bringt der hochintegrierte Radnabenantrieb sechs Kilogramm mehr auf die Waage. Insgesamt konnten wir das Fahrzeuggewicht aber noch einmal senken , so Dr. Raphael Fischer, Leiter Produktgruppe Radnabenantriebe im Schaeffler Systemhaus Elektromobilit t, da neben der Fl ssigkeitsk hlung auch die Leistungselektronik und Controller im Rad platziert werden konnten und eine umfangreiche Verkabelung im Fahrzeug entf llt.
Das B-Segment-Fahrzeug dient als Erprobungstr ger. Vollends ihre St rken k nnen Radnabenantriebe indes erst in neuen Fahrzeugkonzepten ausspielen , ordnet Prof. Peter Gutzmer, Schaeffler Vorstand f r Forschung und Entwicklung, die Antriebs-Innovation im Rahmen des auto, motor und sport -Kongresses ein: Erst der hochintegrierte Radnabenantrieb erm glicht es, das Stadtauto neu und v llig frei zu denken. Er ist zuk nftig ein Schl ssel f r neue Fahrzeugkonzepte und Automobilplattformen. F r urban genutzte Elektrofahrzeuge, wie sie in einigen Ballungsr umen obligatorisch werden k nnen, schafft der Radnabenantrieb eine bislang ungekannte Raum konomie. Bei diesen neuartigen Fahrzeugkonzepten sind alle f r Vortrieb, Bremsen und Fahrsicherheit relevanten Bauteile im Rad untergebracht. In der Fahrzeugplattform bleibt damit der maximale Platz f r Passagiere, Gep ck sowie Batterie, Elektronik und Kommunikation. Und darauf k nnen die Fahrzeughersteller dann unterschiedliche Karosserien realisieren. Das ist so, wie das Autobauen einmal angefangen hat.
Die Premiere beim auto, motor und sport -Kongress ist eine Abwechslung im eng gesteckten Erprobungskalender des Entwicklungsfahrzeugs. So kommt der in enger Kooperation mit Ford Research & Advanced Engineering Europe aufgebaute Fiesta E-Wheel Drive beispielsweise gerade von ausgedehnten Testfahrten aus der skandinavischen K lte. Die Wintererprobung ist ein Teil des umfangreichen, gemeinsamen Entwicklungs-, Abstimmungs- und Testprogramms. Fahrdynamische Tests nehmen dabei einen gro en Raum ein. Exzellente Fahrdynamik geh rt zu den Hauptattributen von Ford Fahrzeugen und wir haben auch bei diesem Projekt unsere Kompetenz und Erfahrung in diesem Bereich genutzt. Die Fahrversuche haben deutlich gezeigt, dass das Fahrverhalten hinsichtlich Komfort und Sicherheit bei diesem Erprobungsfahrzeug trotz der h heren, radgefederten Massen im Vergleich zum konventionellen Basisfahrzeug auf nahezu gleich hohem Niveau ist , erkl rt Roger Graaf, der Projektleiter bei Ford Research & Advanced Engineering Europe. Vielmehr legt der Fiesta E-Wheel Drive eine au ergew hnliche Dynamik an den Tag. Denn neben der Applikation einer Fahrdynamikstabilit tsregelung erm glichen die beiden Radnabenantriebe auch ein so genanntes Torque Vectoring, die radselektive Verteilung der Antriebsmomente.
So bieten hochintegrierte Radnabenantriebe neben einer perfekten Raumnutzung auch deutliche Vorteile in punkto Man vrierbarkeit, Fahrdynamik sowie aktiver Sicherheit. Dies kann zuk nftig insbesondere in Kombination mit Autonomem Fahren eine bedeutende Rolle spielen , erkl rt Prof. Peter Gutzmer. Damit k nnte der elektrische Radnabenantrieb zu einem Antrieb von bermorgen und einer wertvollen Erg nzung des Antriebsf chers werden, der global gesehen weiterhin von dem zunehmend elektrifizierten verbrennungsmotorischen Antriebsstrang bestimmt werden wird.
Der Schaeffler Radnabenantrieb E-Wheel Drive ist mittlerweile auch Teil eines vom Bundesministerium f r Wirtschaft und Technologie (BMWi) gelisteten Forschungsprojekts. Die Vorteile dieses Antriebskonzepts sind im Fiesta E-Wheel Drive bereits heute eindrucksvoll erfahrbar.
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