Vehicle driveline system

1. A vehicle driveline system for a vehicle, said system comprising a differential having a differential housing connectable to an engine via a pinion, and two output shafts being connectable with respective wheel axles, and an electrical motor being selectively connected to the differential housing, such that in case no torque is transferred from the engine to the pinion this enables an axle driven solely by the electric motor, and in case when said pinion is in fact transferring torque to the differential so that mechanical all wheel drive is provided, the electrical motor will add additional driving torque to the front axle, wherein the differential housing being integral with or connected to a hollow shaft having a radial protrusion provided with engagement means, such as splines, for connecting with a shifting sleeve, wherein said shifting sleeve is configured to be actuated for connecting the electrical motor to said differential housing,

wherein the electrical motor is selectively connected to the differential housing via a reduction gearing such that torque from the electrical motor is either added to the axle or used for torque vectoring by connecting the electrical motor to the differential housing as well as to one of the output shafts via a planetary gearing.

2. The vehicle driveline system according to claim 1 , wherein the differential housing comprises an outer gearing configured to mesh with the pinion and an inner gearing being connected with the output shafts, wherein the shifting sleeve is configured to be actuated for connecting the inner gearing to said outer gearing.

3. The vehicle driveline system according to claim 2 , wherein the inner gearing forms the hollow shaft having the radial protrusion.

4. The vehicle driveline system according to claim 2 , wherein the shifting sleeve is configured to be positioned in any one of the following modes: i) a first mode in which the shifting sleeve connects the electrical motor to the inner gearing of the differential housing, ii) a second mode in which the shifting sleeve is disconnected from the electrical motor and the outer gearing of the differential housing, iii) a third mode in which the shifting sleeve connects the outer gearing of the differential housing to the electrical motor while disconnecting the inner gearing of the differential housing, and iv) a fourth mode in which the shifting sleeve connects the outer gearing of the differential housing to the electrical motor and to the inner gearing of the differential housing.

5. The vehicle driveline system according to claim 1 , wherein said reduction gearing comprises a gear train having a last gear being arranged coaxially around the hollow shaft of the differential housing, said last gear having means for connecting with the shifting sleeve.

6. The vehicle driveline system according to claim 1 , wherein the electrical motor is arranged radially outside said hollow shaft.

7. The vehicle driveline system according to claim 1 , wherein the planetary gearing has a first output shaft being connected to the differential housing ( 11 ), and a second output shaft being connected to one of the output shafts of the differential.

8. The vehicle driveline system according to claim 1 , further comprising a disc coupling being arranged on an input side of the pinion for transferring driving torque to said pinion.

9. A vehicle driveline system for a vehicle, said system comprising a differential having a differential housing connectable to an engine via a pinion, and two output shafts being connectable with respective wheel axles, and an electrical motor being selectively connected to the differential housing, such that in case no torque is transferred from the engine to the pinion this enables an axle driven solely by the electric motor, and in case when said pinion is in fact transferring torque to the differential so that mechanical all wheel drive is provided, the electrical motor will add additional driving torque to the front axle, wherein the differential housing being integral with or connected to a hollow shaft having a radial protrusion provided with engagement means, such as splines, for connecting with a shifting sleeve, wherein said shifting sleeve is configured to be actuated for connecting the electrical motor to said differential housing,

wherein the electrical motor is selectively connected to the differential housing via a reduction gearing such that torque from the electrical motor is either added to the axle or used for torque vectoring, wherein said electrical motor is connectable to the differential housing via a planetary gearing, wherein the planetary gearing has a first output shaft being connected to the differential housing ( 11 ), and a second output shaft being connected to one of the output shafts of the differential, wherein the output shafts of the planetary gearing are formed by a respective planet carrier, and wherein the planet carriers are meshing with a common ring wheel.

10. A vehicle driveline system for a vehicle, said system comprising a differential having a differential housing connectable to an engine via a pinion, and two output shafts being connectable with respective wheel axles, and an electrical motor being selectively connected to the differential housing, such that in case no torque is transferred from the engine to the pinion this enables an axle driven solely by the electric motor, and in case when said pinion is in fact transferring torque to the differential so that mechanical all wheel drive is provided, the electrical motor will add additional driving torque to the front axle, wherein the differential housing being integral with or connected to a hollow shaft having a radial protrusion provided with engagement means, such as splines, for connecting with a shifting sleeve, wherein said shifting sleeve is configured to be actuated for connecting the electrical motor to said differential housing,

wherein the electrical motor is selectively connected to the differential housing via a reduction gearing such that torque from the electrical motor is either added to the axle or used for torque vectoring, wherein the differential housing further comprises a disconnect clutch configured to selectively connect an outer gearing of the differential housing to an inner gearing of the differential housing.