Abstract
To improve fuel economy and emission control, OEMs are working on downsizing of engine. This leads to increase in torsional vibration levels at engine output. Huge amount of work has been done in the past to reduce the torsional vibrations. Prime focus is given on ECU calibration, flywheel inertia and clutch damper spring tuning. These levers have a limitation on the extent to which the torsional vibration can be damped. And, when these gets further transferred to transmission it will lead to rattle issue and affect the life of the brass synchronizer or sintered engaging gear (with countering steel cones). In reference to the work done to address the synchronizer failure observed in the passenger car application due to high torsional vibration, this paper showcases the test methodology used to evaluate the durability of the synchronizers against the torsional vibration. Also, it explains the details of test conducted with different combinations of synchronizer and engaging gear to address the issue of torsional vibration generated in engine and travelling via clutch to the transmission