Patent ID: 8522635

Claim:
A hybrid propulsion system for a motor vehicle comprising a combustion engine, an electric machine, and a gearbox, wherein the electric machine is kinematically connected to the gearbox by a first drive transmission mechanism comprising a pinion carried by an output shaft of the electric machine, a gear of the gearbox and a first intermediate gear; the gearbox comprising a gear control device and first and second shafts on which are mounted a plurality of idle gears and a plurality of slidable engagement sleeves, each of which is associated with one or two idle gears to connect the idle gears for rotation with the respective first or second shaft; the gear control device comprising a first drum control device associated with the first shaft to control the movement of the slidable engagement sleeves disposed on the first shaft, a second drum control device associated with the second shaft to control the movement of the slidable engagement sleeves disposed on the second shaft, and an actuation unit arranged to bring about rotation of the first and second drum control devices in a synchronized manner; the actuation unit comprising at least one motor device and a second drive transmission mechanism; the second drive transmission mechanism comprising at least one first gear associated with the first drum control device, at least one second gear associated with the second drum control device, and at least one second intermediate gear, the at least one first gear or at least one second gear meshing directly or indirectly with an output pinion of the at least one motor device and the at least one second intermediate gear meshing with the at least one first gear and with the at least one second gear; and wherein the at least one second intermediate gear is arranged coaxially with the first intermediate gear.