Oil-cooling structure for magnets of motor, and motor

1. An oil-cooling structure for motor magnets, the oil-cooling structure comprising:

a rotor shaft;

a rotor core mounted at an outer peripheral surface of the rotor shaft, which rotates integrally with the rotor shaft;

a plurality of magnets disposed along a peripheral direction at an interior of the rotor core, and respectively extending along an axial direction of the rotor shaft;

an oil reservoir formed at an interior of the rotor shaft, to which oil is supplied from an exterior;

a plurality of first oil paths extending from the oil reservoir at an interior of the rotor core in radial directions to a plurality of cooling oil holes that are formed at radial direction inner sides of the plurality of magnets, respectively;

a plurality of second oil paths extending along the axial direction at the radial direction inner sides of the plurality of magnets, respectively, and reaching axial direction end portions of the rotor core from the plurality of cooling oil holes;

a pair of end plates that are disc-shaped and are mounted at both end portions of the rotor core;

third oil paths formed at interiors of the end plates, and having

axial direction portions that extend in the axial direction and are connected to axial direction end portions of the second oil paths, respectively, and

discharging portions that extend toward a radial direction outer side from axial direction outer side end portions of the axial direction portions and are open at end portions of the end plates; and

angle mitigating members disposed in the third oil paths at corner portions formed by the axial direction portions and the discharging portions, the angle mitigating members being configured to mitigate angles formed by the axial direction portions and the discharging portions in axial direction cross-sections that include the third oil paths,

wherein

the axial direction portions and the discharging portions form right angles in axial direction cross-sections of the end plates that include the third oil paths, and

the angle mitigating members are right-triangular in axial direction cross-section, right-angled portions of the angle mitigating members being disposed so as to conform to align with the corner portions formed by the axial direction portions and the discharging portions.

2. The oil-cooling structure of claim 1 , wherein

the discharging portions extend from axial direction outer side end portions of the axial direction portions toward radial direction outer sides of the end plates, and

radial direction outer side end portions of the discharging portions are open at outer peripheral surfaces of the end plates.

3. The oil-cooling structure of claim 1 , wherein

the discharging portions have

radial direction portions that extend from axial direction outer side end portions of the axial direction portions toward radial direction outer sides of the end plates, and

opening portions that extend from radial direction outer side end portions of the radial direction portions toward axial direction outer sides and are open at axial direction outer side end surfaces of the end plates.

4. A motor, comprising an oil-cooling structure for motor magnets, the oil-cooling structure including:

a rotor shaft;

a rotor core mounted at an outer peripheral surface of the rotor shaft, which rotates integrally with the rotor shaft;

a plurality of magnets disposed along a peripheral direction at an interior of the rotor core, and respectively extending along an axial direction of the rotor shaft;

an oil reservoir formed at an interior of the rotor shaft, to which oil is supplied from an exterior;

a plurality of first oil paths extending from the oil reservoir at an interior of the rotor core in radial directions to a plurality of cooling oil holes that are formed at radial direction inner sides of the plurality of magnets, respectively;

a plurality of second oil paths extending along the axial direction at the radial direction inner sides of the plurality of magnets, respectively, and reaching axial direction end portions of the rotor core from the plurality of cooling oil holes;

a pair of end plates that are disc-shaped and are mounted at both end portions of the rotor core;

third oil paths formed at interiors of the end plates, and having axial direction portions that extend in the axial direction and are connected to axial direction end portions of the second oil paths, respectively, and discharging portions that extend toward a radial direction outer side from axial direction outer side end portions of the axial direction portions and are open at end portions of the end plates; and

angle mitigating members disposed in the third oil paths at corner portions formed by the axial direction portions and the discharging portions, configured to mitigate angles formed by the axial direction portions and the discharging portions in axial direction cross-sections that include the third oil paths,

wherein

the axial direction portions and the discharging portions form right angles in axial direction cross-sections of the end plates that include the third oil paths, and

the angle mitigating members are right-triangular in axial direction cross-section, right-angled portions thereof being disposed so as to conform to align with the corner portions formed by the axial direction portions and the discharging portions.