In automotive front-end accessory drives (FEAD), the crankshaft supplies power to accessories like alternators, pumps, etc. When the FEAD undergoes forced vibration due to crankshaft excitation, dynamic tension fluctuations can cause the belt to slip on the accessory pulleys. In this paper, an accessory inertia (e.g. alternator) is isolated/separated from the FEAD by placing between the pulley and accessory a combination of one-way rigid clutch and an isolator spring. The rotational response of a typical FEAD is extended to include this decoupler-isolator. Analytical solutions are obtained by considering it as a piecewise-linearised system abut the equilibrium angular displacements. The tension fluctuation of the ordinary FEAD is then compared to that of the system with a decoupler/isolator.The results indicate that within the practical working range of engine speeds, use of either an isolator or a decoupler/isolator could significantly lower the dynamic tension drop across the accessory pulley.
Dynamic analysis of a front-end accessory drive with a decoupler/isolator
Dynamische Analyse eines Motorzubehörantriebs mit einem Entkoppler/Isolator
International Journal of Vehicle Design ; 39 , 3 ; 208-231
2005
24 Seiten, 22 Bilder, 1 Tabelle, 12 Quellen
Aufsatz (Zeitschrift)
Englisch
Riemenantrieb , Schwingungsverhalten , Anwendung im Motorenbau , Fahrzeugzubehör , Schwingungsanregung , erzwungene Schwingung , mechanische Schwingung , Entkopplung , Freilaufkupplung , Drehzahlbereich , Frequenzgang , Federkraft , Massenträgheit , mathematische Lösung , dynamisches System , Kraftfahrzeugmotor , Kurbelwelle , Schwingungsdämpfung
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