Variation of load for the improvement of the running-in behaviour of dry-running friction pairings

Precisely controllable and adjustable clutches play a key role in the transformation of the automotive industry. Therefore, constant frictional properties of the built in friction pairings are beneficial. These frictional properties can be volatile under certain boundary conditions such as during run-in, at elevated temperatures and under greatly increased loads. This behavior can be improved due to the selection of the friction materials. Besides, the latest research results show that the recovery behavior after fade is also influenced by the load collective. Its variation can demonstrably lead to an improvement inf the recovery behavior [1]. Nevertheless, tt remains to be shown to what extent the variation of the load collective can also contribute in other situations in order to achive the desired friction properties more precisely and more quickly. The aim of this study is to demonstrate this potential based on the run-in behavior of dry-running friction pairings with organic friction linings. In order to derive load collectives that shorten the running-in explanatory models as well as methods, results and findings from previous research work [1, 2] are used. The experimental results show that a shortening of the run-in and a stabilization of the friction properties can be achieved through these changes. Consequently, it is conceivable to monitor the frictional properties in future applications and, if necessary, to regulate them in a targeted manner by varying the load collective.