| 摘要 |
The hybrid propulsion system for an internal combustion engine having a mechanical gearbox and an electric machine. A gear shift device includes a plurality of sliding engagement sleeves, each arranged to connect a driven gearwheel 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, a rotary drum having on its outer cylindrical surface a corresponding plurality of guide grooves in each of which a respective stud slidably engages for translation with a respective shift fork in the sliding direction of this latter, 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. |
