Processing and Performance of PM Synchronizer Rings With Friction Linings  (625 KB)
Lorenz S. Sigl, Günter Rau, Bernd-Robert Höhn and Hermann Pflaum
Euro PM 2003 Conference, Valencia

Frictional linings in PM synchronizer rings were evaluated on a ZF/FGZ-SSP180 synchro test-rig with respect to their tribological properties and wear behavior. Carbon-filament based linings were compared to a sintered frictional reference material. It was found that the woven carbon materials are inferior to sintered linings in terms of the magnitude of the friction coeffcient, endurance behavior and wear resistance. Thus woven carbon fabrics have only limited capability to serve as a friction material in synchro-systems. Specifically, they increase the risk for breakdown of the synchromesh systems with respect to locking synchronisation.