Downsizing and downspeeding are the essential elements in order to reduce fuel consumption. This attendeds a decreasing number of cylinders and a high degree of supercharging or turbocharging which leads to higher torsional vibrations. On the other hand the customers will not accept a degradation of NVH-behavior or, in other words, a reduction of comfort. Far from it, the customer demands will be increasing and will lead to upgrading of requirements. The fact that the centrifugal pendulum absorber (CPA) in combination with a suitable torsional vibration damper features an outstanding performance was shown in several publications. Moreover they have been implemented in both manual and automatic transmissions and are already in mass-production. The 2nd generation CPA shows, especially in a low rotational speed range nearby the idling speeds, a considerably better isolation characteristics. In this way the whole potential of the combination of low-speed high-torque (LSHT) engines and transmissions with a high ratio spread can be used even at the lowest rotational speeds. Torsional vibration dampers with 2nd generation CPA becoming a key technology, which allows driving at rotation speeds nearby idling range with zero slip speed. This applies to automatic transmissions with torque converter, as for manual or dual-clutch gearboxes with dual mass flywheel (DMFW). The 2nd generation CPA is also a base on which designs for challenging 3-cylinder applications can be provided. The simulation shows significant advantages in isolation especially for speeds below 1400 rpm for the example of a front wheel drive (FWD) application.
Torsional dampers with 2nd generation centrifugal pendulum absorber for manual and automatic transmissions
2011
12 Seiten, 14 Bilder, 6 Quellen
Conference paper
English
Automotive engineering | 2011
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