A hybrid propulsion system for a motor vehicle with a double-drum gear control device

摘要

The hybrid propulsion system (10) comprises a combustion engine (12), a gearbox (16), and an electric machine (20) kinematically connected to the gearbox (16) by means of a first drive transmission mechanism (22) comprising a pinion (74) carried by an output shaft (72) of the electric machine (20), one (44) of the gears of the gearbox (16) and an intermediate gear (76). The gearbox (16) comprises a gear control device (80, 82) and first and second shafts (28, 30) on which are mounted a plurality of idle gears (46, 48, 50, 52, 60, 62, 64) and a plurality of slidable engagement sleeves (54, 56, 68, 70) each of which is associated with one or two idle gears to connect them for rotation with the respective first or second shaft (28, 30). The gear control device (80, 82) comprises a first drum control device (80) associated with the first shaft (28) to control the movement of the slidable engagement sleeves (54, 56) disposed on that shaft, a second drum control device (82) associated with the second shaft (30) to control the movement of the slidable engagement sleeves (68, 70) disposed on that shaft, and an actuation unit (116, 122) which is arranged to bring about rotation of the first and second drum control devices (80, 82) in a synchronized manner. The actuation unit (116, 122) comprises a motor device (116) and a second drive transmission mechanism (122) in turn comprising a first gear (124) associated with the first drum control device (80), a second gear (126) associated with the second drum control device (82), and an intermediate gear (128), the first or second gear (124, 126) meshing with an output pinion (120) of the motor device (116) and the intermediate gear (128) meshing both with the first gear (124) and with the second gear (126). The intermediate gear (128) of the second drive transmission mechanism (122) is coaxial with the intermediate gear (76) of the first drive transmission mechanism (22).