Vehicle drive device

1. A vehicle drive device including a hydraulically operated speed change mechanism, and connected to an engine for use, comprising:

a case including a case main body portion accommodating the speed change mechanism, and a connection case portion connecting the engine and the case main body portion and having a diameter increased toward the engine and accommodating at least one of a torque converter, a damper and a rotating electrical machine;

a hydraulic pressure control device that is provided under the speed change mechanism, and controls a hydraulic pressure to be supplied to the speed change mechanism; and

an electric pump that generates the hydraulic pressure to be supplied to the speed change mechanism through the hydraulic pressure control device, wherein

the case main body portion includes a peripheral wall portion that protrudes downward from the case main body portion so as to surround a periphery of the hydraulic pressure control device, and a wall on the engine side of the peripheral wall portion serves as a pump mounting wall on which the electric pump is mounted, and

a case-side intake oil passage that is connected to a pump-side intake oil passage of the electric pump, and a case-side discharge oil passage that is connected to a pump-side discharge oil passage of the electric pump are provided in the pump mounting wall.

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

a mechanical pump that is driven by a driving force of the engine is provided in the case,

a main intake oil passage and a main discharge oil passage, which connect the mechanical pump and the hydraulic pressure control device, are provided in the case main body portion, and

the case-side intake oil passage is connected to the main intake oil passage, and the case-side discharge oil passage is connected to the main discharge oil passage.

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

the electric pump is positioned so as to overlap the case when viewed from above the case.

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

ribs, which are provided on both outer sides of the electric pump in a width direction of the case and extend in a direction crossing the pump mounting wall, are formed so as to protrude downward from the connection case portion.

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

the electric pump is structured so as to be fixedly fastened to the pump mounting wall by one or more fastening members, and one or more fastening holes in which the fastening members are fastened are provided in the pump mounting wall, and

at least one of the fastening holes is a processed fastening hole formed by performing a drilling process in the pump mounting wall, and one or both of the case-side intake oil passage and the case-side discharge oil passage are a processed oil passage formed by performing the drilling process in the pump mounting wall, and

the processed fastening hole and the processed oil passage are positioned so as not to overlap each other in a direction perpendicular to a direction in which the pump mounting wall protrudes from the case main body portion in a wall plane of the pump mounting wall.

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

a thin portion having a smaller thickness than a thickness of a remaining portion of the pump mounting wall is formed between the processed fastening hole and the processed oil passage in the direction perpendicular to the direction in which the pump mounting wall protrudes from the case main body portion.

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

the case main body portion and the connection case portion are formed so as to be separable from each other.

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

the electric pump is positioned so as to overlap the case when viewed from above the case.

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

ribs, which are provided on both outer sides of the electric pump in a width direction of the case and extend in a direction crossing the pump mounting wall, are formed so as to protrude downward from the connection case portion.

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

the electric pump is structured so as to be fixedly fastened to the pump mounting wall by one or more fastening members, and one or more fastening holes in which the fastening members are fastened are provided in the pump mounting wall, and

at least one of the fastening holes is a processed fastening hole formed by performing a drilling process in the pump mounting wall, and one or both of the case-side intake oil passage and the case-side discharge oil passage are a processed oil passage formed by performing the drilling process in the pump mounting wall, and

the processed fastening hole and the processed oil passage are positioned so as not to overlap each other in a direction perpendicular to a direction in which the pump mounting wall protrudes from the case main body portion in a wall plane of the pump mounting wall.

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

a thin portion having a smaller thickness than a thickness of a remaining portion of the pump mounting wall is formed between the processed fastening hole and the processed oil passage in the direction perpendicular to the direction in which the pump mounting wall protrudes from the case main body portion.

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

ribs, which are provided on both outer sides of the electric pump in a width direction of the case and extend in a direction crossing the pump mounting wall, are formed so as to protrude downward from the connection case portion.

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

ribs, which are provided on both outer sides of the electric pump in a width direction of the case and extend in a direction crossing the pump mounting wall, are formed so as to protrude downward from the connection case portion.

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

the electric pump is structured so as to be fixedly fastened to the pump mounting wall by one or more fastening members, and one or more fastening holes in which the fastening members are fastened are provided in the pump mounting wall, and

at least one of the fastening holes is a processed fastening hole formed by performing a drilling process in the pump mounting wall, and one or both of the case-side intake oil passage and the case-side discharge oil passage are a processed oil passage formed by performing the drilling process in the pump mounting wall, and

the processed fastening hole and the processed oil passage are positioned so as not to overlap each other in a direction perpendicular to a direction in which the pump mounting wall protrudes from the case main body portion in a wall plane of the pump mounting wall.

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

the electric pump is structured so as to be fixedly fastened to the pump mounting wall by one or more fastening members, and one or more fastening holes in which the fastening members are fastened are provided in the pump mounting wall, and

at least one of the fastening holes is a processed fastening hole formed by performing a drilling process in the pump mounting wall, and one or both of the case-side intake oil passage and the case-side discharge oil passage are a processed oil passage formed by performing the drilling process in the pump mounting wall, and

the processed fastening hole and the processed oil passage are positioned so as not to overlap each other in a direction perpendicular to a direction in which the pump mounting wall protrudes from the case main body portion in a wall plane of the pump mounting wall.

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

the electric pump is structured so as to be fixedly fastened to the pump mounting wall by one or more fastening members, and one or more fastening holes in which the fastening members are fastened are provided in the pump mounting wall, and

at least one of the fastening holes is a processed fastening hole formed by performing a drilling process in the pump mounting wall, and one or both of the case-side intake oil passage and the case-side discharge oil passage are a processed oil passage formed by performing the drilling process in the pump mounting wall, and

the processed fastening hole and the processed oil passage are positioned so as not to overlap each other in a direction perpendicular to a direction in which the pump mounting wall protrudes from the case main body portion in a wall plane of the pump mounting wall.

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

the electric pump is structured so as to be fixedly fastened to the pump mounting wall by one or more fastening members, and one or more fastening holes in which the fastening members are fastened are provided in the pump mounting wall, and

at least one of the fastening holes is a processed fastening hole formed by performing a drilling process in the pump mounting wall, and one or both of the case-side intake oil passage and the case-side discharge oil passage are a processed oil passage formed by performing the drilling process in the pump mounting wall, and

the processed fastening hole and the processed oil passage are positioned so as not to overlap each other in a direction perpendicular to a direction in which the pump mounting wall protrudes from the case main body portion in a wall plane of the pump mounting wall.