212 DOUBLE CLUTCH SYSTEMS 13 21313 DOUBLE CLUTCH SYSTEMSSchaeffler Symposium 2018 This becomes evident in two clutches currently in production shown in Figure 4 These clut ches have wear adjustment mechanisms and are actuated in their applications by means of bearings With regard to their thermal mass they are designed for small and medium vehi cle weights Since these clutches are not oil cooled the cast material masses required to ensure the necessary thermal capacity of the clutches lead to higher moments of inertia than the wet clutches that also serve as the secondary mass of the torsion damping system Even though the drag torques of the sealed and grease lubricated bearings are slightly eleva ted the dry double clutches are a low cost and efficient alternative in their range of applica tions By eliminating the wear adjustment and mini mizing the thermal mass it is possible to offer a variant for low vehicle weights and low torques of up to 150 Nm This clutch meets customer re quirements for the low cost segment Friction linings for double clutches A key technology of the clutch is the tribological system in a wet clutch it consists of steel plates oil and wet running friction linings Schaeffler of fers its own linings for both dry and wet running double clutch systems Volume production experience in wet and dry double clutches has been essential in Schaeffler s ability to provide its systems with a lining produced in house making it an independent supplier of complete systems Schaeffler is thus able to customize functions to customers speci fic needs Schaeffler s friction lining is ready for volume production and production facilities for the friction plates are in place The manufacturing process was developed for corrugated friction plates The steel plates have been in production since 2015 The friction system offers the following character istics Good heat dissipation Low drag torque High statistical friction coefficient Minor torque irregularities Positive friction coefficient gradient µ v for damping behavior during the entire life cycle The development of this one layer wet running fric tion lining followed a comprehensive approach that is shown in Figure 6 and that integrates material development design development surface tech nology process expertise simulation testing and manufacturing technology Various areas of exper tise at Schaeffler were used to develop the wet fric tion lining with the required characteristics Compared with other benchmark friction linings on the market Schaeffler s wet friction lining shows a good performance both in new condi tion and throughout service life Figure 7 The friction coeff icient characteristics of Schaeffler s lining are comparable to competitor products which is why it can also be used in existing customer applications 4 Half section of two double clutches with wear adjuster 5 Half section of a dry double clutch without wear adjustment paper segmentation stamping tacking Bonding press Friction material 1 2 layer material Functional surface Friction coefficient Design function development 2 phase oil flow simulation Temperature simulation Pad technology innovative technology Steel plate Testing Process Assembly 6 Comprehensive approach to the development of Schaeffler s wet friction lining

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