Hybrid vehicle transmission with a mechanical reverse system

1. A transmission system, comprising:

a mechanical reverse assembly including a reverse gearset that comprises at least a first gear on a first primary shaft and a second gear that is torsionally coupled to an output shaft of an electric machine and the first primary shaft;

wherein the mechanical reverse assembly includes a coupling device;

wherein the coupling device is designed to:

in a reverse drive configuration, mechanically attach the reverse gearset to the first primary shaft; and

wherein the coupling device includes:

a first sleeve coupling designed to selectively engage the reverse gearset and the first primary shaft; and

a second sleeve coupling designed to selectively engage a double gear with the first primary shaft.

2. The transmission system of claim 1 , wherein the coupling device is designed to, in a forward drive configuration, rotationally couple the output shaft and the first primary shaft via a pair of forward drive gears, and in a neutral configuration, rotationally couple the output shaft and a secondary shaft.

3. The transmission system of claim 2 , further comprising:

a controller including instructions that when executed cause the controller to:

automatically shift the coupling device from the neutral configuration or the forward drive configuration into the reverse drive configuration.

4. The transmission system of claim 3 , wherein the coupling device is automatically shifted into the reverse drive configuration in any of a full electric vehicle (EV) mode, a full internal combustion engine (ICE) mode, and a hybrid mode.

5. The transmission system of claim 1 , wherein the coupling device includes a synchronizer mounted on the first primary shaft.

6. The transmission system of claim 1 , further comprising a dual clutch coupled to an engine flywheel and selectively rotationally coupling the engine flywheel to the first primary shaft and a second primary shaft.

7. The transmission system of claim 1 , wherein the mechanical reverse assembly includes a driving gear on the first primary shaft, an idle gear, and a driven gear sequentially meshing with one another.

8. The transmission system of claim 1 , further comprising a park lock assembly coupled to a secondary shaft that is arranged parallel to the coupling device.

9. The transmission system of claim 1 , further comprising:

a controller including instructions that when executed, during a transition from a reverse drive mode to a forward drive mode, cause the controller to:

automatically shift the coupling device from the reverse drive configuration to a forward drive configuration.

10. A transmission in a hybrid drivetrain, comprising:

a mechanical reverse assembly designed to be engaged in each of a hybrid mode, a full electric vehicle (EV) mode, and a combustion engine mode, wherein the mechanical reverse assembly includes a reverse gearset with a drive gear on a first primary shaft and a driving gear that is torsionally coupled to an output of an electric machine; and

an internal combustion engine interface selectively rotationally coupled to the first primary shaft;

wherein the reverse gearset includes the drive gear on the first primary shaft, an idle gear, and a gear on an idle shaft of the electric machine;

wherein the mechanical reverse assembly includes a coupling device;

wherein the coupling device is designed to:

in a reverse drive configuration, mechanically attach the reverse gearset to the first primary shaft; and

wherein the internal combustion engine interface is a flywheel and the transmission further comprises a dual clutch coupled to the flywheel and selectively coupled to the first primary shaft and a second primary shaft.

11. The transmission of claim 10 , wherein the mechanical reverse assembly includes at least two coupling devices arranged on distinct shafts.

12. The transmission of claim 10 , wherein the internal combustion engine interface is positioned on a first axial end of the first primary shaft and the mechanical reverse assembly is positioned on a second axial end of the first primary shaft.

13. The transmission of claim 10 , further comprising a park lock assembly coupled to an end of a secondary shaft spaced away from the internal combustion engine interface.