| 摘要 |
<p>A gear change device for a motor vehicle comprises a first and a second primary shaft (1A, 1B) coaxial with respect to each other, selectively connectable to the driving shaft of the motor vehicle by means of a double clutch engagement device, and a first and a second secondary shaft (2A, 2B), whose axes are parallel and spaced from the common axis of said primary shafts, and having respective output pinions (u',u") intended to mesh with the gear wheel of a differential. The gear change device further comprises a fifth shaft (50) parallel and spaced with respect to the common axis of the two primary shafts (1A, 1B) and with respect to the axes of the two secondary shafts (2A, 2B) and carrying a further pinion (100) for meshing with the abovementioned gear wheel of the differential, and a parking gear wheel (P) connected in rotation with said further pinion (100) and cooperating with a locking device (B) for locking the gear change device in a parking condition. The parking gear wheel (P) is mounted freely rotatable around the axis of the fifth shaft (50), entirely independently with respect to the primary shafts (1A, 1B) and with respect to the secondary shafts (2A, 2B), i.e. without any transmission connection with any of said primary shafts (1A, 1B) and said secondary shafts (1A, 1B). The parking gear wheel (P) extends radially towards the first secondary shaft (2A) within the space between the first reverse gear wheel (R') and a rolling bearing (3) which rotatably supports the first secondary shaft (2A). The bearing is axially interposed between the first reverse gear wheel (R') and the output pinion (u') of the first secondary shaft (2A).</p> |
