Gear change device for a motor-vehicle

A gear-change device for a motor vehicle comprises a first primary shaft (1A) and a second primary shaft (1B), which are coaxial and can be connected selectively to the engine shaft of the motor vehicle by means of a double-clutch device, and a first secondary shaft (2A) and a second secondary shaft (2B), the axes of which are parallel and set at a distance from the common axis of said primary shafts, and which have respective output pinions (u) that are to mesh with the gear wheel of a differential. The device further comprises a plurality of pairs of gear wheels (10,1; 20,II, 30,111; 46,IV; 57,V; 46,VI; 57,VII), corresponding to a plurality of forward gears and to at least one reverse gear, wherein one of the gear wheels of each pair is rigidly connected in rotation to one of the primary shafts (1A, 1B) or to one of the secondary shafts whilst the other is set so that it can turn freely on one of the secondary shafts (2A, 2B) or on one of the primary shafts, respectively. Rigidly mounted on the first secondary shaft (2A) is a parking gear wheel (P) co-operating with a locking device (B) for locking the gear-change device in a parking condition. The first secondary shaft (2A) has its output pinion (u) set within the length between two end bearings (3) that support in rotation the first secondary shaft (2A), whilst the second secondary shaft (2B) has its output pinion (u) set on the outside of the length between two end bearings (3) that support in rotation the second secondary shaft (2B), on a portion of the second secondary shaft (2B) that projects in cantilever fashion beyond the bearing adjacent thereto. The parking gear wheel (P) has an axial position substantially displaced with respect to the axial position of a forward gear wheel (II) on the second secondary shaft (2B) in such a way that the first secondary shaft (2A) is surrounded by a free space in the portion axially aligned with said forward gear wheel (II).