Synchronization device

A synchronization device for synchronizing first and second torque-transmitting parts of a transmission by, the synchronization device comprising:

• a first disk carrier connectable to the first torque-transmitting part,
• a second disk carrier connectable to the second torque-transmitting part, and
• a disk set having
• a first disk and a second disk mounted to the first disk carrier, and
• a corresponding first disk and a corresponding second disk mounted to the second disk carrier, and
• the first and second disks of the first and second disk carriers having friction surfaces to couple torque between the first and second disk carriers, and
• at least one of the disk carriers being actuated by a clutch device to engage the first and second disks of the first and second disk carriers, and
• the first disk and the second disk mounted to the first disk carrier by a plurality of teeth spaced apart by a fixed distance to receive corresponding teeth of the first disk carrier, wherein
• widths of the teeth of the second disk mounted to the first disk carrier are less than the width of the teeth of the first disk mounted to the first disk carrier, so that the teeth of the second disk mounted to the first disk carrier mate with the teeth of the first disk carrier subsequent to the teeth of the first disk of the first disk carrier and in a succession to provide a lower initial meshing torque and a larger subsequent synchronizing torque.