Patent ID: 8534148
Filing Date: 2013-09-17
Classification: F16H,Y10T

Abstract:
1. A gear change device for a motor vehicle, comprising: a first primary shaft and a second primary shaft coaxial with respect to each other, selectively connectable to a driving shaft of the motor vehicle by means of a double clutch engagement device, a first secondary shaft and a second secondary shaft, whose axes are parallel and spaced from the common axis of said primary shafts, and having respective output gear wheels intended to mesh with the gear wheel of a differential, a plurality of pairs of gear wheels, corresponding to a plurality of forward gear ratios and to at least one reverse gear ratio, wherein a first gear wheel of the gear wheels of each pair is rigidly connected in rotation with one of the primary shafts or with one of the secondary shafts while a second gear wheel of each pair is freely rotatable on one of the secondary shafts or on one of the primary shafts, a plurality of gear selector devices for rotatably coupling each of said freely rotatable gear wheels with the shaft on which it is mounted, wherein the reverse gear ratio is defined by: wherein a parking gear wheel is operatively connected to said first secondary shaft cooperating with a lock device for locking the gear change device in the parking condition, wherein said parking gear wheel is rotatably mounted on a fourth axis, parallel and spaced with respect to the common axis of the two primary shafts and with respect to the axes of the two secondary shafts, and said parking gear wheel permanently connected in rotation around said fourth axis with a first auxiliary gear wheel, which meshes with a second auxiliary gear wheel connected in rotation on said first secondary shaft.