Dual Input Clutch Assembly: Description and Operation

Double Clutch







The wet-running double clutch is a central module of the Porsche Doppelkupplung (PDK). With its wide range of technical features, it meets the functional requirements of the transmission control system, thereby shaping the special character of this transmission concept. Very fast response times, low inertia and good, comfortable friction values combined with good economic viability allow both very sporty driving with highly dynamic gear changing as well as comfortable cruising.

For safety reasons, the clutches are opened when they are depressurized and inactive. The radial arrangement of the disc packs provides the best combination from the points of view of performance and space.

The wet-running double clutches installed in the Panamera transmissions come in two size:
- One for the aspirated models for engine torques up to 520 Nm
- One for the turbo model for engine torques up to 750 Nm

The double clutch for the aspirated models is identical to the double clutch in the sportscars. The oil pump is designed to output a maximum of 67 liters.

Careful selection of pad type, pad dimensions and usage as well as uniform distribution of thermal load and oil flow in the disc pack, along with the corresponding oil types, are prerequisites for comfort and performance over the service life. Low drag torques even at low temperatures and good resistance at high speeds guarantee comfort and excellent sportiness, but are also important safety requirements.

The friction discs comprise a steel carrier and a friction material made from paper. Paper is perhaps a misnomer, since it is a high-performance fiber more do to the production method than to the product. This fiber matrix is produced on a paper-making machine, in which an aqueous paper slurry (fibers and fillers) is dried on a strainer and bonded to a steel carrier.