A transmission unit includes: input shafts, each of the input shafts being provided with a shift driving gear thereon; output shafts, each of the output shafts being provided with a shift driven gear configured to mesh with a corresponding shift driving gear; a generator gear disposed on one of the output shafts; a motor power shaft; a first motor power shaft gear disposed on the motor power shaft and configured to rotate together with the generator gear; a second motor power shaft gear disposed on the motor power shaft and configured to rotate together with a shift driven gear; a reverse idler gear; and a reverse output gear configured to rotate together with a shift driving gear via the reverse idler gear. A power transmission system including the transmission unit and a vehicle including the power transmission system are also provided.

A transmission unit includes: input shafts; output shafts; an output unit fitted over one of the output shafts; output gears fixed on other output shafts; a generator gear fixed on one of the output shafts; an output unit synchronizer disposed on one of the output shafts and at least configured to engage with the output unit; a motor power shaft gear fixed on a motor power shaft and configured to rotate together with the generator gear. A power transmission system including the transmission unit and a vehicle including the power transmission system are also provided.

A transmission unit includes: input shafts; output shafts; an output unit fitted over one of the output shafts; output gears fixed on other output shafts; a generator gear fixed on one of the output shafts; an output unit synchronizer disposed on one of the output shafts and at least configured to engage with the output unit; a motor power shaft gear fixed on a motor power shaft and configured to rotate together with the generator gear. A power transmission system including the transmission unit and a vehicle including the power transmission system are also provided.

A hybrid transmission (18) for a motor vehicle drive train (12) of a motor vehicle (10) includes: a first transmission input shaft (24) for operatively connecting the hybrid transmission to an internal combustion engine (16); a second transmission input shaft (26) for operatively connecting the hybrid transmission to a first electric prime mover (14); an output shaft (28) for operatively connecting the hybrid transmission to a drive output (32); a planetary gear set (RS) connected to the first transmission input shaft and to the second transmission input shaft; spur gear pairs (ST1, ST2, ST3) arranged in multiple gear set planes for forming gear steps; and a plurality of gear change devices that include shift elements (A, B, C, D, E) for engaging gear steps. The output shaft is of a countershaft design, and the planetary gear set is interlockable when decoupled from the output shaft.

A powertrain may include a plurality of shafts disposed in parallel with a transmission input shaft of a first shifting mechanism which receives power from an engine, and transmitting power from a motor to a driving shaft while a vehicle is driven; and a second shifting mechanism including a plurality of gears fitted on the shafts, in which one of the gears remains engaged and rotated as a driven gear by a constant synchronizer while the vehicle is driven.

A powertrain may include a plurality of shafts disposed in parallel with a transmission input shaft of a first shifting mechanism which receives power from an engine, and transmitting power from a motor to a driving shaft while a vehicle is driven; and a second shifting mechanism including a plurality of gears fitted on the shafts, in which one of the gears remains engaged and rotated as a driven gear by a constant synchronizer while the vehicle is driven.

A powertrain for a hybrid vehicle includes a first propulsion unit for powering the vehicle, a second propulsion unit for powering the vehicle, a Dual Clutch Transmission (DCT), and the second propulsion unit the ECU is programmed to control the gear shift such that when a gear shift of the first propulsion unit is made in order to change the overall gear ratio from the first input shaft to the output shaft by changing the double clutch engagement from the second clutch, engaging the second power path, to the first clutch, engaging the first power path, the power connection between the second propulsion unit and the second power path is maintained.

A powertrain for a hybrid vehicle includes a first propulsion unit for powering the vehicle, a second propulsion unit for powering the vehicle, a Dual Clutch Transmission (DCT), and the second propulsion unit the ECU is programmed to control the gear shift such that when a gear shift of the first propulsion unit is made in order to change the overall gear ratio from the first input shaft to the output shaft by changing the double clutch engagement from the second clutch, engaging the second power path, to the first clutch, engaging the first power path, the power connection between the second propulsion unit and the second power path is maintained.

A dual-motor power system or a dual-motor hybrid power system for a vehicle comprises a first motor, a second motor, an intermediate shaft, a first gear set disposed between a first driving shaft, and an intermediate shaft. The first driving shaft couples with the intermediate shaft via the first gear set, a second gear set disposed between the second driving shaft and the intermediate shaft, and a single synchronizer disposed around the second driving shaft. The synchronizer can be switched between a neutral position, a first-speed-ratio position, and a second-speed-ratio position. In the neutral position, the second driving shaft is decoupled from the first and second gear sets. In the first-speed-ratio position, the synchronizer couples the second driving shaft with the intermediate shaft via the first gear set. In the second-speed-ratio position, the synchronizer couples the second driving shaft with the intermediate shaft via the second gear set.

A dual-motor power system or a dual-motor hybrid power system for a vehicle comprises a first motor, a second motor, an intermediate shaft, a first gear set disposed between a first driving shaft, and an intermediate shaft. The first driving shaft couples with the intermediate shaft via the first gear set, a second gear set disposed between the second driving shaft and the intermediate shaft, and a single synchronizer disposed around the second driving shaft. The synchronizer can be switched between a neutral position, a first-speed-ratio position, and a second-speed-ratio position. In the neutral position, the second driving shaft is decoupled from the first and second gear sets. In the first-speed-ratio position, the synchronizer couples the second driving shaft with the intermediate shaft via the first gear set. In the second-speed-ratio position, the synchronizer couples the second driving shaft with the intermediate shaft via the second gear set.