| 摘要 |
Motor vehicle gearbox with two concentrically mounted input shafts, each driving an individual layshaft, having gears in engagement with gears on an output shaft. One layshaft has a central synchronization device, via which the layshaft which is driveably coupled to the momentarily non-driven input shaft, can be accelerated up to a rotational speed chosen by the selected gear speed. The central synchronization device has a friction clutch and two synchronization gears of different diameter, the gear of smaller diameter being widened relative to the other and being lockable to the shaft by an engagement sleeve, so that drive torque can be transmitted via the synchronization gear. The second layshaft is releasable by an engagement device, whereby torque can be transmitted from one layshaft to the other and to the output shaft.
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