Patent ID: 11894751
Assignee: NIDEC CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 0:
1. A drive device comprising:
a motor portion that includes a rotor having a shaft rotatable about a rotation shaft extending along an axial direction, and a stator disposed radially outward of the rotor; and
a housing for accommodating the motor portion,
wherein the shaft includes:
a shaft tubular portion that extends in the axial direction; and
a hollow portion surrounded by an inner side surface of the shaft tubular portion,
the housing includes:
a motor tubular portion that extends in the axial direction and surrounds the stator;
a motor lid portion attached to one axial end portion of the tubular portion,
a motor accommodation space that is surrounded by the motor tubular portion and accommodates the motor; and
a refrigerant flow path through which a refrigerant flows,
the refrigerant flow path includes:
a first flow path through which the refrigerant to be sent from a pump flows;
a second flow path through which the refrigerant to be supplied to the motor portion flows;
a third flow path through which a part of the refrigerant flowing through the second flow path is supplied to an outer surface of the stator; and
a fourth flow path through which another part of the refrigerant flowing through the second flow path is supplied to the hollow portion of the shaft, and
a minimum flow-path cross-sectional area in the fourth flow path is smaller than a minimum flow-path cross-sectional area in the third flow path.