Patent ID: 8646349
Filing Date: 2014-02-11
Classification: B60K,F16H,Y02T,Y10T

Abstract:
1. A motor-vehicle hybrid propulsion system where the motor vehicle includes an internal combustion engine and a double-clutch transmission, said system comprising: a mechanical gearbox having an odd number of forward gears of at least five, as well as one reverse gear, and an electric machine, said gearbox including a first primary shaft carrying driving gearwheels associated with the odd gears and the reverse gear, a second primary shaft coaxial with the first primary shaft and carrying driving gearwheels associated with the even gears, and at least one secondary shaft carrying a plurality of idle driven gearwheels operatively meshing with the driving gearwheels carried by the two primary shafts; said gearbox including a gear shift device having a plurality of sliding engagement sleeves, each arranged to connect a driven gearwheel corresponding to a given gear for rotation with the respective secondary shaft, a corresponding plurality of sliding shift forks, each arranged to cause a respective engagement sleeve to slide between a neutral position and at least one shift position, and a rotary drum having an outer cylindrical surface including a corresponding plurality of guide grooves in each of which a respective stud slidably engages, said stud being connected for translation with a respective shift fork in the sliding direction of said shift fork, and an actuation unit arranged to cause the drum to rotate stepwise among a plurality of angular positions each corresponding to predetermined positions of the engagement sleeves; wherein said electric machine is kinematically connected to the second primary shaft; and wherein said guide grooves of the drum are shaped in such a manner that, in a first angular position of said plurality of angular positions, the engagement sleeves are positioned so as to engage at the same time the highest odd gear and the fourth gear.