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Schaeffler Group

Torque Converter with Centrifugal Pendulum Absorber

The torque converter with Centrifugal Pendulum Absorber (CPA) is an innovation that dampens torsional vibration in the engine-transmission drivetrain, allowing full lock up of the converter at remarkably low engine speeds. This enables fuel economy gains of 2-5%. The need is driven by OEM development of higher power density engines with fewer cylinders, which result in larger torque fluctuations and NVH that would be unacceptable without this highly effective damping. Schaeffler Group is the only company to date to be able to reduce the invention to practice in torque converters, overcoming obstacles of getting the pendulum weights to operate effectively in oil, with essentially no noise, and minimal weight. It eliminates the NVH constraint when calibrating the engine speed for full lock-up.