Vehicle powertrain system, a vehicle, and a method for operating a vehicle powertrain system

A vehicle powertrain system comprising an electric motor, a planetary gear set, a coupling unit, and a differential unit,

• wherein the electric motor is drivingly connected to the planetary gear set via a motor shaft extending in an axial direction, and wherein the planetary gear set is operably connectable to the differential unit via the coupling unit,
• wherein the powertrain system further comprises an idle gear wheel and a differential drive gear wheel arranged on the differential unit, wherein the coupling unit is arranged for selectively transferring torque to the idle gear wheel, and wherein the idle gear wheel and the differential drive gear wheel are arranged to drivingly interact with each other for transferring torque from the electric motor to the differential unit, via the planetary gear set and the coupling unit,
• wherein the differential unit is configured for being positioned in a lateral centre section of a vehicle in which the vehicle powertrain system is arranged;
• wherein the planetary gear set comprises a sun gear, a ring gear, and two or more planet gears connected to a planet carrier, and wherein the coupling unit comprises a coupling shaft and an actuating member arranged on the coupling shaft, wherein the motor shaft is drivingly connected to the sun gear, the coupling shaft is drivingly connected to the planet carrier, and wherein the idle gear wheel is arranged on the coupling shaft;
• and
• wherein the actuating member is a synchronizer slidingly arranged on the coupling shaft, and wherein the idle gear wheel is journally connected to the coupling shaft via a second bearing.

A vehicle powertrain system comprising an electric motor, a planetary gear set, a coupling unit, and a differential unit,

• wherein the electric motor is drivingly connected to the planetary gear set via a motor shaft extending in an axial direction, and wherein the planetary gear set is operably connectable to the differential unit via the coupling unit,
• wherein the powertrain system further comprises an idle gear wheel and a differential drive gear wheel arranged on the differential unit, wherein the coupling unit is arranged for selectively transferring torque to the idle gear wheel, and wherein the idle gear wheel and the differential drive gear wheel are arranged to drivingly interact with each other for transferring torque from the electric motor to the differential unit, via the planetary gear set and the coupling unit,
• wherein the differential unit is configured for being positioned in a lateral centre section of a vehicle in which the vehicle powertrain system is arranged;
• wherein the planetary gear set comprises a sun gear, a ring gear, and two or more planet gears connected to a planet carrier, and wherein the coupling unit comprises a coupling shaft and an actuating member arranged on the coupling shaft, wherein the motor shaft is drivingly connected to the sun gear, the coupling shaft is drivingly connected to the planet carrier, and wherein the idle gear wheel is arranged on the coupling shaft;
• and
• wherein the coupling shaft extends in the axial direction in a coaxial relationship to the motor shaft, wherein the ring gear is coaxially arranged around the motor shaft and wherein the sun gear is arranged to rotate with the motor shaft around an axis extending in the axial direction.