Vehicle drive device

1. A vehicle drive device comprising:

a first rotary electric machine;

a second rotary electric machine;

a first coupler drivingly coupled to a first wheel;

a second coupler drivingly coupled to a second wheel;

a transmission device that transmits torque of the first rotary electric machine to at least the first coupler out of the first coupler and the second coupler, and transmits torque of the second rotary electric machine to at least the second coupler out of the first coupler and the second coupler; and

a case that accommodates the first rotary electric machine, the second rotary electric machine, the first coupler, the second coupler, and the transmission device; wherein

the first rotary electric machine and the second rotary electric machine are disposed in this order from an axial first side defining one side in an axial direction, on a first axis;

the first coupler and the second coupler are disposed on a second axis parallel to the first axis,

an intermediate wall that is a member forming the case or that is a member fixed to the case is disposed to extend in a radial direction with respect to the first axis, between the first rotary electric machine and the second rotary electric machine in the axial direction,

a first drive shaft that rotates with the first rotary electric machine and a second drive shaft that rotates with the second rotary electric machine are further disposed on the first axis,

an end of the first drive shaft on an axial second side opposite to the axial first side in the axial direction is rotatably supported by the intermediate wall,

an end of the second drive shaft on the axial first side is rotatably supported by the intermediate wall,

a first oil passage for supplying oil to the first rotary electric machine is formed inside the first drive shaft in the axial direction,

a second oil passage for supplying oil to the second rotary electric machine is formed inside the second drive shaft in the axial direction,

a supply oil passage to which oil is supplied from a hydraulic pressure source is formed in the intermediate wall, and

an end of the first oil passage on the axial second side and an end of the second oil passage on the axial first side are connected to the supply oil passage.

2. The vehicle drive device according to claim 1 , wherein

the supply oil passage is formed to split at a branch into a first branch oil passage connected to the first oil passage, and a second branch oil passage connected to the second oil passage, and

the branch, the first branch oil passage, and the second branch oil passage are formed at positions overlapping the first oil passage and the second oil passage as viewed in the axial direction.

3. The vehicle drive device according to claim 2 , wherein a distance in the axial direction from the branch to the first rotary electric machine and a distance in the axial direction from the branch to the second rotary electric machine are equal.

4. The vehicle drive device according to claim 1 , wherein

the first oil passage is formed to have an inner diameter that increases in a stepwise manner toward the axial first side, and

the second oil passage is formed to have an inner diameter that increases in a stepwise manner toward the axial second side.

5. The vehicle drive device according to claim 1 , wherein

the transmission device includes a planetary gear mechanism disposed on a third axis parallel to the first axis and the second axis, and

a third oil passage for supplying oil to the planetary gear mechanism is formed inside a shaft member disposed on the third axis.

6. The vehicle drive device according to claim 2 , wherein

the first oil passage is formed to have an inner diameter that increases in a stepwise manner toward the axial first side, and

the second oil passage is formed to have an inner diameter that increases in a stepwise manner toward the axial second side.

7. The vehicle drive device according to claim 3 , wherein

the first oil passage is formed to have an inner diameter that increases in a stepwise manner toward the axial first side, and

the second oil passage is formed to have an inner diameter that increases in a stepwise manner toward the axial second side.

8. The vehicle drive device according to claim 6 , wherein

the transmission device includes a planetary gear mechanism disposed on a third axis parallel to the first axis and the second axis, and

a third oil passage for supplying oil to the planetary gear mechanism is formed inside a shaft member disposed on the third axis.

9. The vehicle drive device according to claim 3 , wherein

the transmission device includes a planetary gear mechanism disposed on a third axis parallel to the first axis and the second axis, and

a third oil passage for supplying oil to the planetary gear mechanism is formed inside a shaft member disposed on the third axis.

10. The vehicle drive device according to claim 4 , wherein

the transmission device includes a planetary gear mechanism disposed on a third axis parallel to the first axis and the second axis, and

a third oil passage for supplying oil to the planetary gear mechanism is formed inside a shaft member disposed on the third axis.

11. The vehicle drive device according to claim 6 , wherein

the transmission device includes a planetary gear mechanism disposed on a third axis parallel to the first axis and the second axis, and

a third oil passage for supplying oil to the planetary gear mechanism is formed inside a shaft member disposed on the third axis.

12. The vehicle drive device according to claim 7 , wherein

the transmission device includes a planetary gear mechanism disposed on a third axis parallel to the first axis and the second axis, and

a third oil passage for supplying oil to the planetary gear mechanism is formed inside a shaft member disposed on the third axis.