Patent ID: 8915160

Claim:
A group transmission device for a motor vehicle, comprising: a main group ( 11 ) with a central synchronizing unit ( 12 ) assigned to several shifting units ( 13 , 14 , 15 ) for synchronizing at least two main group shifting units ( 13 , 14 , 15 ) for changing a main group transmission ratio, at least one auxiliary group ( 16 ) with at least one auxiliary group shifting unit ( 17 ) for changing an auxiliary group transmission ratio, and a control unit ( 18 ) which is provided to actuate in a shifting operation the auxiliary group shifting unit ( 17 ) and the central synchronizing unit ( 12 ) in order to change an overall gear ratio, the (open and/or closed-loop) control unit ( 18 ) being provided to actuate the auxiliary group shifting unit ( 17 ) the central synchronizing unit ( 12 ) in parallel at least intermittently, the central synchronizing unit ( 12 ) permitting a synchronizing action independent of an actuation of the shifting with units ( 13 , 14 , 15 ).