The performence of gear boxes will further increase in future. This leads to higher requirements for the synchronizer device, especially synchro-performance and shifting comfort. To reach this, good friction behaviour of the friction clutch is necessary. The paper describes investigations on tribological systems with sintered bronze friction linings, bringing out the correlation between surface topography and friction behaviour. Qualified methodes to measure the 3-dimensional surface are presented as well as characteristic. values, which properly describe the surface. The changes in friction behaviour during endurance testing on test rigs become explicable and describable. The basis for correlations is a 3-dimensional surface measurement. The 3-dimensional core roughness depth is a well suited parameter for correlation concerning effects at mixed friction. The core roughness depth agrees with DIN standard specifications and can be evaluated with modern standard 3-D-roughness measurement systems. This ensures a common usage. The correlation between surface topography and friction behaviour during mixed friction can be described properly by using the core roughness depth. Good structure of the friction lining means high values of core roughness depth to avoid hydrodynamic pressure, only boundary friction will be found. Then the friction behaviour shows no or only little dependence of the sliding speed. Selected examples are shown to illustrate the described correlation.
Influence of surface on friction-behaviour of synchronizers
Einfluß der Oberfläche auf das Reibungsverhalten von Kupplungen
2000
8 Seiten, 10 Bilder, 4 Quellen
Conference paper
English
00POW009 Influence of Surface on Friction-Behaviour in Synchronizers
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