Rotor sleeve of driving motor and driving motor including the same
A rotor sleeve provides a direct cooling method in which oil flows into the rotor sleeve via a flow passage formed through an input shaft of a transmission and is distributed to a motor coil of a driving motor to cool the motor coil. The rotor sleeve has a flow passage structure capable of maintaining a balance between the amount of oil to be distributed toward a transmission and the amount of oil to be distributed toward an engine.
1. A rotor sleeve of a driving motor, comprising:
spline grooves formed in an inner surface of the rotor sleeve;
a plurality of apertures formed in at least some of the spline grooves; and
two or more slot portions formed in an outer surface of the rotor sleeve, the slot portions being configured to guide a fluid introduced through the apertures to outlet ports,
wherein at least one of the slot portions is connected to two or more apertures, and a retainer is coupled to the rotor sleeve through the spine grooves.
2. The rotor sleeve of claim 1 , wherein each of the slot portions includes:
an axial-directional slot connected to a respective one of the outlet ports,
wherein the axial-directional slot is formed in a smaller number than a number of the apertures.
3. The rotor sleeve of claim 2 , wherein each of the slot portions includes:
a circumferential-directional slot connected to the axial-directional slot,
wherein the circumferential-directional slot is connected to the plurality of apertures.
4. The rotor sleeve of claim 3 , wherein each of the slot portions has one of a “T” shape and an “L” shape.
5. The rotor sleeve of claim 1 , wherein the plurality of apertures are disposed at positions further inward than centers of the spline grooves in a direction in which the retainer is coupled.
6. The rotor sleeve of claim 1 , wherein the plurality of apertures are formed at same positions in an axial direction.
7. The rotor sleeve of claim 6 , further comprising:
a groove formed in an outer circumferential surface of the rotor sleeve, the groove having an annular shape,
wherein the groove is connected to the plurality of apertures.
8. The rotor sleeve of claim 1 , wherein each of the apertures is formed in a respective one of the spline grooves.
9. The rotor sleeve of claim 1 , wherein the spline grooves are divided into a first group, in which the apertures are formed, and a second group, in which the apertures are not formed, and wherein the first group has an axial-directional slope different from an axial-directional slope of the second group.
10. The rotor sleeve of claim 9 , wherein the axial-directional slope of the first group is smaller than the axial-directional slope of the second group.
11. The rotor sleeve of claim 9 , wherein the spline grooves in the second group are disposed between adjacent ones of the spline grooves in the first group, and wherein a number of the spline grooves in the second group, disposed between adjacent ones of the spline grooves in the first group, is constant.
12. A driving motor, comprising:
a rotor sleeve of claim 1 ; and
a stator core around which a coil is wound.