The noise Inducted by the vibrations among the unloaded gears of automotive transmissions is of great interest to car designers. The phenomenon, known as 'gear rattle noise', is particularly audible at low speed regimes of the engine and is generated by the irregularity of the I.C. engine torque, causing impacts between the teeth of all the gears that are in meshing but without loading, due to the presence of backlashes. In this paper a theoretical analysis concerning the influence of the oil damping effects on the dynamic behaviour of manual automotive transmissions, in the 'idle' operating condition, is proposed. The study presents an analytical model that accounts both for the hysteretic friction in the clutch springs and for the oil squeeze effect between the impacting teeth of the meshing gears. This last dissipative term, generally neglected in the literature, has been modelled by the authors in order to consider its influence on the 'gear rattle' phenomenon. The results provided by a wide numerical investigation are presented and enable a qualitative comparison between the effects due to the oil and those due to the hysteretic friction in the clutch on the rattle level.
An analysis of the automotive driveline dynamic behaviour focusing on the influence of the oil squeeze effect on the idle rattle phenomenon
Analyse des dynamischen Verhaltens der Kraftübertragung bei Kraftfahrzeugen mit besonderer Berücksichtigung der Öl-Pressung auf das Getrieberasseln im Leerlauf
Journal of Sound and Vibration ; 303 , 3-5 ; 858-872
2007
15 Seiten, 12 Bilder, 3 Tabellen, 18 Quellen
Aufsatz (Zeitschrift)
Englisch
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