الفهرس 
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Abstract
An essential component of a manually operated vehicle transmission is the synchronizer.
synchronizer has 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 behavior under various loading conditions on test rig 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.
A major german car manufactures apply in motor vehicle transmission synchronizations with afriction pairing molybdenum (cone) / steal (sliding sleeve, hollow cone ).
In order to save production coast, afinishing of the sprayed coating by agrinding process was omitted, but after anumber of shifting, an unacceptable DROP in the coefficient of friction was noted.
The characteristic of the coefficient of friction is affected by the structure of the tribosystem.
The goal of this investigation is to determine the dependence of the coefficient of friction behavior on the surface finish for two different tribosystems.