Function Of The 5th Gear Synchronizer

The axial force of the selector rod moves the shift collar in the direction of 5th gear.

With the movement of the shift collar, the C-washer is pressed against the synchronizer ring (upper abutment point)  . At the same time, the C-washer is supported on the synchronizer clutch (lower abutment point)  .

Because of the pressure of the C-washer on the synchronizer ring, this is pressed against the conical friction surface of the gearwheel and thus the pre-synchronization  starts.

As long as the shift collar and gearwheel rotate at different speeds, a turning torque is generated. This twists the synchronizer ring until the synchronizer ring abutment point touches the C-washer abutment point (arrow). The pre-synchronization is over.

After the complete synchronization process is finished, the shift collar moves over the splines of the synchronizer ring into the splines of the gearwheel. In the process, the two C-washers are pushed away inwards against the spring effect of the spring washer.