Reibungsverhalten nasslaufender Lamellenkupplungen am Übergang Haftreibung-Gleitreibung

Wet multi-plate disk clutches are used in industrial and automotive powertrains mainly for safety and comfort tasks. Knowledge on the transmissible torque depending on load and operating conditions is essential for reliable dimensioning of the clutch. In some applications creeping and microslip of the clutch can be noticed under long-term and stationary torque load which can affect function and safety. Currently, there is only a little understanding of the friction behavior of disk clutches under microslip conditions as well as the transmittable static torque without slip. Therefore, basic experimental investigations on the friction behavior under microslip conditions and the static coefficient of friction were carried out. A test and evaluation method has been developed and applied during investigations with selected combinations of friction materials and lubricants. The method enables evaluation of friction behavior of wet disk clutches under low sliding speeds as well as a classification with regard to the powershift friction behavior.