| CPC H02K 5/207 (2021.01) [H02K 5/18 (2013.01); H02K 9/06 (2013.01)] | 8 Claims |
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1. An electric power unit comprising:
a rotary electric machine unit;
an electrical unit disposed outside the rotary electric machine unit; and
a cooling unit, wherein
the rotary electric machine unit further includes:
a rotary electric machine having a stator and a rotor;
a rotary electric machine case having a rotary electric machine housing portion accommodating the rotary electric machine; and
a rotary shaft configured to rotate integrally with the rotor, wherein
the rotary electric machine housing portion includes:
a peripheral wall portion covering an outer peripheral surface of the rotary electric machine;
a first end wall portion covering one axial end side of the rotary electric machine in an axial direction; and
a second end wall portion covering another axial end side in the axial direction, and
the rotary shaft is inserted through the rotary electric machine housing portion and protrudes from the first end wall portion to the one axial end side,
the electrical unit is disposed outside the peripheral wall portion of the rotary electric machine housing portion when viewed from the axial direction and disposed at a position at which at least a part of the electrical unit overlaps the rotary electric machine housing portion when viewed from a direction orthogonal to the axial direction,
the electrical unit includes a protrusion, the protrusion, when viewed from the axial direction, protruding outward from one end portion of the rotary electric machine housing portion in a second direction orthogonal to a first direction, the first direction being a direction in which the electrical unit is disposed with respect to the rotary electric machine housing portion, and
the cooling unit includes:
a cooling fan configured to generate cooling air; and
an air guide unit configured to guide the cooling air, wherein
the cooling fan is provided on an axially outer side of the one axial end side of the rotary electric machine housing portion and configured to rotate integrally with the rotary shaft, and
the air guide unit includes cooling air flow paths provided between the cooling fan and the electrical unit when viewed from the axial direction, wherein
the cooling air flow paths include introduction ports opened toward the cooling fan and discharge ports opened toward the electrical unit when viewed from the axial direction,
the closer to the protrusion of the electrical unit a cooling air flow path is disposed, the larger opening area of the introduction port the cooling air flow path has,
the cooling air flow paths are disposed side by side between the cooling fan and the electrical unit in a circumferential direction of the cooling fan when viewed from the axial direction,
introduction directions of the cooling air at respective introduction ports incline away from the protrusion along the second direction with respect to the first direction, and
inclinations of the introduction directions get larger in an order of arrangement of the cooling air flow paths along the circumferential direction of the cooling fan.
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