Pump device

A pump device comprising:

• a shaft that rotates around a central axis that extends in an axial direction;
• a motor that rotates the shaft;
• and
• a pump that is positioned on one side of the motor in the axial direction, is driven by the motor via the shaft, and discharges oil;
• wherein
• the motor includes:
• a rotor that rotates around the shaft;
• a stator facing the rotor;
• and
• a housing in which the rotor and the stator are accommodated;
• the pump includes:
• a pump rotor that is attached to the shaft;
• and
• a pump case in which a suction port into which the oil is sucked and a discharge port from which the oil is discharged are provided and the pump rotor is accommodated;
• the pump device further comprises:
• a first flow path for the oil that connects an interior of the pump and an interior of the housing;
• a second flow path for the oil provided between the stator and the rotor;
• and
• a third flow path for the oil that is connected to a pump suction port through an outside of the stator and the rotor in a radial direction from the second flow path;
• at least one groove is provided on an inner peripheral surface of the rotor and the stator disposed in a radially outward direction or on an outer peripheral surface of the rotor and the stator disposed in a radially inward direction;
• and
• the at least one groove is inclined with respect to an oil flow direction.

A pump device comprising:

• a shaft that rotates around a central axis that extends in an axial direction;
• a motor that rotates the shaft;
• and
• a pump that is positioned on one side of the motor in the axial direction, is driven by the motor via the shaft, and discharges oil;
• wherein
• the motor includes:
• a rotor that rotates around the shaft;
• a stator that faces an inner side of the rotor in a radial direction;
• a housing in which the rotor and the stator are accommodated;
• the pump includes:
• a pump rotor that is attached to the shaft;
• and
• a pump case in which a suction port into which the oil is sucked and a discharge port from which the oil is discharged are provided and the pump rotor is accommodated;
• the pump device further comprises:
• a first flow path for the oil that connects an interior of the pump and an interior of the housing;
• a second flow path for the oil provided between the stator and the rotor;
• and
• a third flow path for the oil including a flow path connected to the second flow path through an interior of the stator and the rotor in the radial direction from the first flow path and a flow path connected to a pump suction port from the second flow path;
• wherein
• at least one groove is provided on an inner peripheral surface of the rotor and the stator disposed in a radially outward direction or on an outer peripheral surface of the rotor and the stator disposed in a radially inward direction;
• and
• the at least one groove is inclined with respect to an oil flow direction.

A pump device comprising:

• a shaft that rotates around a central axis that extends in an axial direction;
• a motor that rotates the shaft;
• and
• a pump that is positioned on one side of the motor in the axial direction, is driven by the motor via the shaft, and discharges oil;
• wherein
• the motor includes:
• a rotor that rotates around the shaft;
• a stator that faces the rotor in the axial direction;
• and
• a housing in which the rotor and the stator are accommodated;
• the pump includes:
• a pump rotor that is attached to the shaft;
• and
• a pump case in which a suction port into which the oil is sucked and a discharge port from which the oil is discharged are provided and the pump rotor is accommodated;
• the pump device further comprises:
• a first flow path for the oil that connects an interior of the pump and an interior of the housing;
• a second flow path for the oil provided between the stator and the rotor;
• and
• a third flow path for the oil that is connected to a pump suction port through an outside of the stator and the rotor in a radial direction from the second flow path;
• at least one groove is provided on a facing surface in which the rotor and the stator face each other;
• and
• the at least one groove is inclined with respect to an oil flow direction.