An essential component of manually operated vehicle transmissions is the synchronizer. Synchronizers have the task of minimizing the speed difference between the shifted gearwheel and the shaft by means of frictional torque before engaging the gear. Proper operation requires a sufficiently high coefficient of friction. It is common practice to investigate the friction and wear behaviour under various loading conditions on test rigs or in vehicle tests. An optimized design of the system with regard to appropriate function and durability on the one hand as well as low cost, low mass and compact over-all dimensions on the other hand requires extensive testing. According to the present state of knowledge, derived from numerous experimental investigations, temperature can be attributed the most significant influence on the tribology of synchronizing systems. Therefore, the influence of various loading conditions on contact temperature was investigated, a relation between temperature and tribological performance was established. The finite element method was applied to simulate the thermal behaviour of a synchronizing system depending on different operating conditions. A result of this simulation is the spatial and time-dependent temperature distribution in the area of contact. Characteristics of the tribological performance of a molybdenum coated synchromesh ring in contact with a steel cone were derived from extensive experimental investigations.
Influence of temperature distribution on the tribological performance of automotive synchronisers
Einfluß der Temperaturverteilung auf die tribologischen Eigenschaften von Fahrzeugsynchronisatoren
Tribological Research and Design for Engineering Systems, Leeds-Lyon Symposium on Tribology, 29 ; 613-621
Tribology Series ; 41
2003
9 Seiten, 13 Bilder, 1 Tabelle, 2 Quellen
Aufsatz (Konferenz)
Englisch
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