ELECTRIC DRIVE AXLE ASSEMBLY AND VEHICLE COMPRISING THE SAME

1 . An electric drive axle assembly for a vehicle, the electric drive axle assembly comprising:

an electrical machine;

a transmission assembly configured to, when the electric drive axle assembly is arranged in a vehicle, transmit driving power from the electrical machine to at least one drive wheel of said vehicle via a drive shaft of the transmission assembly, said transmission assembly comprising a final gear wheel pair comprising a final gear wheel arranged on the drive shaft; and

a lubrication system comprising:

an oil sump, arranged in lower portion of a housing the transmission assembly;

a supply system configured to supply oil from the oil sump to one or more constituent components of the electric drive axle assembly; and

reservoir arrangement arranged so as to enclose a lower portion of the final gear wheel.

2 . The electric drive axle assembly according to claim 1 , wherein the supply system is configured to supply oil to a cooling system of the electrical machine, said cooling system comprising a return conduit configured to return oil from the cooling system of the electrical machine to the reservoir arrangement.

3 . The electric drive axle assembly according to claim 1 , wherein the reservoir arrangement comprises at least one drainage opening configured to allow drainage of oil from the reservoir arrangement to the oil sump.

4 . The electric drive axle assembly according to claim 1 , wherein the reservoir arrangement comprises an upper rim encircling the lower portion of the final gear wheel, said upper rim arranged above a predefined maximum oil level of the oil sump.

5 . The electric drive assembly according to claim 1 , wherein the reservoir arrangement comprises:

a first oil reservoir arranged so as to enclose said lower portion of the final gear wheel; and

a second oil reservoir configured to supply oil to the first oil reservoir.

6 . The electric drive axle assembly according to claim 5 , wherein the second oil reservoir is fluidly connected to the first oil reservoir via an aperture and/or channel arranged in a wall of the second oil reservoir.

7 . The electric drive axle assembly according to claim 5 , wherein the second oil reservoir is arranged above the first oil reservoir.

8 . The electric drive axle assembly according to claim 5 , wherein the supply system is configured to supply oil to at least one gear wheel, other than the final gear wheel, of the transmission assembly, and the second oil reservoir is arranged so as to collect at least a portion of the oil supplied to said at least one gear wheel.

9 . The electric drive axle assembly according to claim 5 , wherein:

the first oil reservoir comprises a first drainage opening configured to allow controlled drainage of oil from the first oil reservoir to the oil sump; and

the second oil reservoir comprises a second drainage opening configured to allow controlled drainage of oil from the second oil reservoir to the oil sump.

10 . The electric drive axle assembly according to claim 5 , wherein the transmission assembly further comprises:

a main shaft arranged in parallel with the drive shaft;

a lay shaft arranged in parallel with the main shaft and the drive shaft;

a first gear wheel connected and rotationally locked to an output shaft of the electrical machine;

a first gear wheel pair comprising a second gear wheel, rotationally locked to the layshaft, and a third gear wheel engaged with the second gear wheel, said third gear wheel arranged on and connectable to the main shaft; and

a second gear wheel pair comprising a fourth gear wheel, rotationally locked to the layshaft, and a fifth gear wheel engaged with the fourth gear wheel, said fifth gear wheel arranged on and connectable to the main shaft,

wherein the first gear wheel is engaged with the second gear wheel or the fourth gear wheel, and

wherein the final gear wheel pair comprises a sixth gear wheel rotationally locked to the main shaft and engaged with the final gear wheel.

11 . The electric drive axle assembly according to claim 10 , wherein the second oil reservoir is arranged between the final gear wheel and the electrical machine, and below the main shaft of the transmission assembly.

12 . The electric drive axle assembly according to claim 1 , wherein the transmission assembly further comprises:

a main shaft arranged in parallel with the drive shaft;

a lay shaft arranged in parallel with the main shaft and the drive shaft;

a first gear wheel connected and rotationally locked to an output shaft of the electrical machine;

a first gear wheel pair comprising a second gear wheel, rotationally locked to the layshaft, and a third gear wheel engaged with the second gear wheel, said third gear wheel arranged on and connectable to the main shaft; and

a second gear wheel pair comprising a fourth gear wheel, rotationally locked to the layshaft, and a fifth gear wheel engaged with the fourth gear wheel, said fifth gear wheel arranged on and connectable to the main shaft,

wherein the first gear wheel is engaged with the second gear wheel or the fourth gear wheel, and

wherein the final gear wheel pair comprises a sixth gear wheel rotationally locked to the main shaft and engaged with the final gear wheel.

13 . The electric drive assembly according to claim 10 , wherein the final gear wheel is connected to the drive shaft via a differential.

14 . A vehicle comprising an electric drive axle assembly comprising:

an electrical machine;

a transmission assembly configured to, when the electric drive axle assembly is arranged in a vehicle, transmit driving power from the electrical machine to at least one drive wheel of said vehicle via a drive shaft of the transmission assembly, said transmission assembly comprising a final gear wheel pair comprising a final gear wheel arranged on the drive shaft; and

a lubrication system comprising:

an oil sump, arranged in lower portion of a housing of the transmission assembly;

a supply system configured to supply oil from the oil sump to one or more constituent components of the electric drive axle assembly; and

a reservoir arrangement arranged so as to enclose a lower portion of the final gear wheel.

15 . The electric drive axle assembly according to claim 5 , wherein the aperture and/or channel is arranged in a bottom wall of the second oil reservoir.

16 . The electric drive axle assembly according to claim 10 , wherein the transmission assembly further comprises a planetary gear arranged on the main shaft between the first gear wheel pair and the final gear wheel pair.

17 . The electric drive axle assembly according to claim 12 , wherein the transmission assembly further comprises a planetary gear arranged on the main shaft between the first gear wheel pair and the final gear wheel pair.