Patent ID: 11879537
Assignee: VOLVO CAR CORPORATION
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  B | IPC B  F

Claim 6:
7. An electric vehicle, comprising:
an electric motor assembly with an output shaft, and
a transmission gear assembly connected to the output shaft of the electric motor assembly, the transmission gear assembly comprising:
a housing with an axial center line, the housing having a circumferential wall extending in an axial direction, and
an end wall at a motor side and a front wall at an output side, the end wall and the front wall extending in a radial direction, the walls defining an oil reservoir having an upper part and a lower part,
an opening being provided in the end wall for receiving an input shaft,
a gear system being rotatably mounted in the housing and connectable to the input shaft,
an opening being provided in the front wall for receiving an output shaft that is connectable to the gear system,
a breather opening being provided in the circumferential wall, and
the front wall comprising an annular groove that is in fluid communication with the breather opening at an upper side of the front wall, the annular groove being covered by a substantially circular plate having a perimeter at a first distance (r) from the axial center line and with a predetermined length (L), the perimeter extending near the circumferential wall, with on each transverse side of the axial center line in at least the lower part an air/oil inlet and outlet defined by a recess of the perimeter at a distance (r3,r4) from the axial center line that is smaller than the first distance r, each recess having a circumferential length (l3,l4) and being in fluid communication with the annular groove, and with on each transverse side of the axial center line in the upper part an air/oil inlet is defined by a recess of the perimeter at a distance (r1,r2) from the axial center line that is smaller than the first distance (r) and having a circumferential length (l1,l2) that is shorter than the circumferential length (l3,l4) of the inlet/outlets.