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Komfort rauf - CO und Kosten runter

01/02/2016

2016-01-29 | 000-006-594 DE-DE

SCHAEFFLER AG, B HL

Die Schaeffler Kupplungsscheibe mit Fliehkraftpendel erf llt hohe Komfortziele und reduziert CO2-Emissionen

Komfort rauf - CO2 und Kosten runter

Trends im Motorenbau wie Downsizing stellen Entwickler vor gro e Herausforderungen. Eine davon ist, auftretende Torsionsschwingungen im Antriebsstrang zu eliminieren. Die Antriebsstrang-Spezialisten der Schaeffler-Marke LuK haben jetzt in Gestalt der Kupplungsscheibe mit Torsionsd mpfer und Fliehkraftpendel eine wirtschaftliche Alternative entwickelt. In ihrer Wirksamkeit liegt diese unter dem Zweimassenschwungrad (ZMS) und oberhalb der Kupplungsscheibe mit Torsionsd mpfer. Potenzielles Anwendungsgebiet sind Verbrennungsmotoren im Drehmomentbereich bis circa 250 Nm und hoher Zugkraft bereits bei niedriger Drehzahl.

Zur Reduktion der Drehungleichf rmigkeit von Verbrennungsmotoren f r den Getriebeeingang werden in Fahrzeugen mit Handschaltgetrieben bislang entweder Kupplungsscheiben mit Torsionsd mpfern oder Zweimassenschwungr der eingesetzt. Das seit ber 30 Jahren bekannte ZMS ist unumstritten das st rkste Mittel zur Beruhigung von Torsionsschwingungen im Antriebsstrang. Vor etwa 10 Jahren konnte durch Einf hrung des ZMS mit Fliehkraftpendel dieses Isolationspotenzial noch einmal deutlich gesteigert werden. Daher wird das Wirkprinzip des Fliehkraftpendels von Schaeffler auch auf andere Antriebsstrangl sungen bertragen. Im Torsionsd mpfer der Wandler berbr ckungskupplung kommt es in Serie zum Einsatz. Auch die Anwendung innerhalb des konventionellen Antriebsstrang mit starrem Schwungrad und Kupplungsscheibe mit Torsionsd mpfer wurde untersucht. Nach ersten Entwicklungsschritten vor einigen Jahren stellte sich heraus, dass die Erweiterung der Kupplungsscheibe (KS) um ein Fliehkraftpendel (FKP) eine besondere Herausforderung darstellt. Inzwischen ist jedoch eine L sung gefunden und ein Gro serieneinsatz in naher Zukunft vorgesehen.

Bei der konstruktiven Umsetzung der Kupplungsscheibe mit Fliehkraftpendel gilt es, m glichst viel Pendelmasse effektiv und auf engstem Bauraum unterzubringen und dies bei gleichzeitig geringstm glicher Erh hung des Massentr gheitsmoments. Die entscheidende Innovation ist die Ausf hrung des Fliehkraftpendels als Trapezpendel. Die Pendelmasse eines Trapezpendels f hrt im Gegensatz zum Parallelpendel nicht nur eine seitliche Pendelbewegung, sondern zus tzlich eine Eigenrotationsbewegung aus. Als Trapezpendel erzielt die eingesetzte Masse h chste Effektivit t, was auch im Sinne einer m glichst geringen Erh hung des Massentr gheitsmoments ist.

Mit Prototypen und anhand von Simulationen wurden sechs verschiedene Fahrzeuge untersucht, um die Wirksamkeit zu demonstrieren.

ber alle untersuchten Fahrzeuge hinweg positioniert sich die Kupplungsscheibe mit Fliehkraftpendel sowohl in ihrer Leistungsf higkeit als auch in den Systemkosten mittig zwischen konventionellem System und ZMS. Es wird sogar die gleiche niedrigste fahrbare Drehzahl erreicht wie mit ZMS, sodass die gleiche verbrauchsg nstige Fahrweise m glich ist. Die KS mit FKP ist damit ein Produkt, mit dem zu angemessenen Kosten Komfortziele erf llt werden k nnen, wo ein konventionelles System nicht ausreicht und ein ZMS nicht zwingend n tig ist.
LINK: http://www.ina.de/content.ina.de/en/press/press-releases/press-details...
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