Synchronization

Synchronization

Basic operating principle of servo-lock synchronization

Synchronization in neutral position. The ball (2) holds the operating sleeve (5) in neutral.










When changing gears, the operating sleeve (5) is moved (to the left in the example shown) using the shift fork of the selected gear. The operating sleeve presses the synchronizer ring (1) against the friction cone of the clutch hub (3) via the pressure piece (7). At this moment, the synchronizer ring turns until it reaches a stop (not shown in the illustration). This blocks the movement of the operating sleeve.










The synchronizer ring (1) continues to block the operating sleeve for as long as there is a difference in speed between the clutch hub (3) and operating sleeve. The synchronizer ring can only be turned back through the operating sleeve when the speed is the same. The latter is then moved on slightly to the clutch hub. The gear is engaged.







Synchronization of reverse, 1st, 2nd and 3rd gear

Triple cone synchronization is used for reverse, 1st, 2nd and 3rd gear. The use of three friction cones has resulted in a considerable reduction in synchronizing forces. This reduces shifting forces when engaging gears. The first friction cone comprises the friction cone of the clutch hub of the loose gear wheel (2) and the inner cone of the inner ring (4). The second friction cone comprises the outer cone of the inner ring (4) and the inner cone of the intermediate ring (3). The third friction cone comprises the outer cone of the intermediate ring (3) and the inner cone of the synchroniser ring (1).







Synchronization of 4th, 5th, 6th and 7th gear







Single cone synchronization is used for 4th, 5th, 6th and 7th gear. The cones from the clutch hub (2) and the cones of the synchronizer rings (1) form the friction cone.