Rotary electrical machine and vehicle driving device including rotary electrical machine

1 . A rotary electrical machine comprising:

a stator;

a rotor; and

a cooling flow path through which a coolant for cooling the stator and the rotor flows,

wherein the cooling flow path includes

a coolant introduction port into which the coolant is introduced,

a stator cooling flow path that is formed in a stator core of the stator and communicates with the coolant introduction port,

a rotor cooling flow path formed inside the rotor, and

a connection flow path connecting the stator cooling flow path and the rotor cooling flow path,

the rotor cooling flow path includes a coolant discharge port for discharging the coolant to an outer side of the rotor in a radial direction in accordance with rotational movement of the rotor,

a plurality of the stator cooling flow paths are disposed in a circumferential direction of the stator core, and

a terminal of each of the plurality of stator cooling flow paths is connected to an upstream side of the connection flow path at a position that is opposite to the coolant introduction port in an axial direction and opposite to the coolant introduction port in the circumferential direction.

2 . The rotary electrical machine according to claim 1 ,

wherein the upstream side of the connection flow path is disposed below the coolant introduction port in a vertical direction.

3 . The rotary electrical machine according to claim 2 ,

wherein two connection flow paths are formed, and a coolant release port for releasing the coolant to an outside is disposed between the two connection flow paths.

4 . The rotary electrical machine according to claim 1 ,

wherein the coolant introduction port is disposed below the upstream side of the connection flow path in a vertical direction.

5 . The rotary electrical machine according to claim 1 ,

wherein the stator cooling flow paths have the same cross-sectional shape that is perpendicular to the axial direction and are arranged at equal intervals in the circumferential direction.

6 . The rotary electrical machine according to claim 1 ,

wherein a pump is connected to the coolant introduction port, and the coolant is pressure-fed by the pump.

7 . The rotary electrical machine according to claim 1 ,

wherein the rotor cooling flow path is formed inside a rotor shaft, and

an oil seal is provided at an end portion of the rotor shaft connected to the connection flow path.

8 . The rotary electrical machine according to claim 7 ,

wherein an end portion of the rotor shaft, which is opposite to the connection flow path, in the axial direction is solid.

9 . The rotary electrical machine according to claim 1 , further comprising

a motor housing that accommodates the stator and the rotor,

wherein the motor housing is formed in a bottomed cylindrical shape in which one side in the axial direction is opened,

an open side of the motor housing is covered by a motor cover, and

a protrusion that presses the stator core in the axial direction is formed in the motor cover when the open side of the motor housing is closed.

10 . The rotary electrical machine according to claim 9 ,

wherein a gasket that suppresses leakage of the coolant is disposed between the motor cover and the stator core.

11 . The rotary electrical machine according to claim 9 ,

wherein the motor housing is provided with an inverter housing that accommodates an inverter, and

at least a part of the connection flow path is provided inside the inverter housing or in a space formed by the inverter housing and the motor housing.

12 . A vehicle driving device that includes a stator, a rotor, a rotor shaft provided in the rotor, and a speed reducer fixed to the rotor shaft, and drives a vehicle through the speed reducer, the vehicle driving device comprising

the rotary electrical machine according to claim 1 .