WO2023248668A1

WO2023248668A1 - Rotor, rotary electric machine, and driving device

Info

Publication number: WO2023248668A1
Application number: PCT/JP2023/018894
Authority: WO
Inventors: 将虎美世; 暁麗韓; 誠人吉岡; 響 ▲高▼田; 祥平大菅
Original assignee: ニデック株式会社
Priority date: 2022-06-24
Filing date: 2023-05-22
Publication date: 2023-12-28

Abstract

One aspect of a rotor according to the present invention is a rotor which is disposed inside an annular stator and can rotate about a center axis line, the rotor comprising: a shaft extending along the center axis line; a rotor core fixed to the shaft; and an annular end plate which is provided with an insertion hole into which the shaft is inserted, and is disposed axially side by side with the rotor core. The shaft is provided with: a cavity part provided inside the shaft; and a through-hole which extends radially outside from the cavity part and is open in the outer circumferential surface of the shaft. The end plate has a first side surface facing one side in the axial direction. The first side surface is provided with a groove part having: a first end section connected to the opening of the through-hole; and a second end section located radially outside the first end section. The groove part has a first flow path section extending in a direction oblique to the radial direction. The second end section is located at the first flow path section.

Description

Rotor, rotating electric machine, and drive device

The present invention relates to a rotor, a rotating electric machine, and a drive device.
This application claims priority based on Japanese Patent Application No. 2022-101944 filed in Japan on June 24, 2022, the contents of which are incorporated herein.

A rotating electrical machine that cools a coil end using a refrigerant is known. For example, Patent Document 1 describes a configuration in which an end plate is provided with a discharge passage capable of discharging a refrigerant, and the refrigerant discharged from an opening of the discharge passage is sprayed onto a coil end.

Japanese Patent Application Publication No. 2009-81953

When providing a discharge passage in the end plate as described above, if the refrigerant discharged from the discharge passage of the end plate cannot be sufficiently supplied to the coil end, for example, it may be difficult to spray the refrigerant to the axial end of the coil end. was there.

In view of the above circumstances, one of the objects of the present invention is to provide a rotor, a rotating electrical machine, and a drive device that have a structure that makes it easy to supply refrigerant to the coil ends via the end plates.

One aspect of the rotor of the present invention is a rotor that is arranged inside an annular stator and is rotatable about a central axis, the rotor comprising: a shaft extending along the central axis; a rotor core fixed to the shaft; The rotor core includes an annular end plate provided with an insertion hole into which the shaft is inserted and arranged in line with the rotor core in the axial direction. The shaft is provided with a cavity provided inside the shaft, and a through hole extending radially outward from the cavity and opening at an outer circumferential surface of the shaft. The end plate has a first side surface facing one side in the axial direction. The first side surface is provided with a groove portion having a first end portion connected to the opening of the through hole, and a second end portion located radially outward from the first end portion. The groove portion has a first flow path portion extending in a direction inclined with respect to the radial direction. The second end portion is located in the first flow path portion.

One aspect of the rotating electrical machine of the present invention includes the above-mentioned rotor and the above-mentioned stator.

One aspect of the drive device of the present invention includes the above-mentioned rotating electrical machine and a gear mechanism connected to the rotating electrical machine.

According to one aspect of the present invention, there is provided a rotor, a rotating electric machine, and a drive device that have a structure that makes it easy to supply refrigerant to the coil ends via the end plates.

FIG. 1 is a schematic diagram of a drive device of one embodiment. FIG. 2 is a schematic cross-sectional view of a rotating electric machine according to an embodiment. FIG. 3 is a perspective view of the end plate of one embodiment viewed from the first side. FIG. 4 is a partially enlarged view of FIG. 3. FIG. 5 is an axial view of the end plate of one embodiment. FIG. 6 is a cross-sectional view along the extending direction of the first flow path portion of the end plate of one embodiment. FIG. 7 is a perspective view of the end plate of one embodiment viewed from the second side. FIG. 8 is an axial view of the end plate of Modification 1. FIG. 9 is an axial view of the end plate of Modified Example 2. FIG. 10 is an axial view of the end plate of Modification Example 3. FIG. 11 is an axial view of the end plate of Modified Example 4. FIG. 12 is an axial view of the end plate of Modification Example 5. FIG. 13 is an axial view of the end plate of Modified Example 6. FIG. 14 is an axial view of the end plate of Modification Example 7. FIG. 15 is an axial view of the end plate of Modification Example 8. FIG. 16 is an axial view of the end plate of Modification Example 9. FIG. 17 is an axial view of the end plate of Modification 10.

In the following description, the vertical direction will be defined based on the positional relationship when the drive device of the embodiment is mounted on a vehicle located on a horizontal road surface. That is, the relative positional relationship in the vertical direction described in the following embodiments only needs to be satisfied at least when the drive device is mounted on a vehicle located on a horizontal road surface.

In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction is the vertical direction. The +Z side is the upper side in the vertical direction, and the -Z side is the lower side in the vertical direction. In the following description, the upper side in the vertical direction is simply referred to as the "upper side", and the lower side in the vertical direction is simply referred to as the "lower side". The X-axis direction is a direction perpendicular to the Z-axis direction, and is the front-rear direction of the vehicle in which the drive device is mounted. In the following embodiments, the +X side is the front side of the vehicle, and the -X side is the rear side of the vehicle. The Y-axis direction is a direction perpendicular to both the X-axis direction and the Z-axis direction, and is the left-right direction of the vehicle, that is, the vehicle width direction. In the embodiments below, the +Y side is the left side of the vehicle, and the -Y side is the right side of the vehicle. The front-rear direction and the left-right direction are horizontal directions perpendicular to the vertical direction.

Note that the positional relationship in the longitudinal direction is not limited to the positional relationship in the following embodiments, and the +X side may be the rear side of the vehicle and the -X side may be the front side of the vehicle. In this case, the +Y side is the right side of the vehicle and the -Y side is the left side of the vehicle. Furthermore, in this specification, "parallel directions" include substantially parallel directions, and "orthogonal directions" include substantially orthogonal directions.

A central axis J shown in the figures as appropriate is a virtual axis extending in a direction intersecting the vertical direction. More specifically, the central axis J extends in the Y-axis direction perpendicular to the vertical direction, that is, in the left-right direction of the vehicle. In the following description, unless otherwise specified, the direction parallel to the central axis J is simply referred to as the "axial direction," the radial direction centered on the central axis J is simply referred to as the "radial direction," and the central axis J is simply referred to as the "radial direction." The circumferential direction around the center, that is, around the central axis J is simply referred to as the "circumferential direction."

FIG. 1 is a schematic diagram of a drive device 100 of this embodiment.
The drive device 100 of this embodiment shown in FIG. 1 is a drive device that is mounted on a vehicle and rotates an axle 64. The vehicle in which the drive device 100 is mounted is a vehicle that uses a motor as a power source, such as a hybrid vehicle (HEV), a plug-in hybrid vehicle (PHV), or an electric vehicle (EV). As shown in FIG. 1, the drive device 100 includes a rotating electrical machine 10 and a transmission device 60. The transmission device 60 is connected to the rotating electrical machine 10 and transmits the rotation of the rotating electrical machine 10, that is, the rotation of the rotor 30, which will be described later, to the axle 64 of the vehicle. The transmission device 60 of this embodiment includes a gear housing 61, a speed reduction device 62 connected to the rotating electric machine 10, and a differential device 63 connected to the speed reduction device 62.

The gear housing 61 accommodates a reduction gear 62, a differential gear 63, and oil O therein. Oil O is stored in a lower region within gear housing 61. Oil O circulates within a refrigerant flow path 90, which will be described later. Oil O is used as a refrigerant to cool rotating electric machine 10. Further, oil O is used as a lubricating oil for the reduction gear 62 and the differential gear 63. As the oil O, for example, in order to perform the functions of a refrigerant and a lubricant, it is preferable to use an oil equivalent to automatic transmission fluid (ATF), which has a relatively low viscosity.

The differential device 63 has a ring gear 63a. Torque output from the rotating electrical machine 10 is transmitted to the ring gear 63a via the reduction gear device 62. The lower end of the ring gear 63a is immersed in oil O stored in the gear housing 61. The rotation of the ring gear 63a scrapes up the oil O. A portion of the oil O that has been scraped up is supplied, for example, to the reduction gear 62 and the differential gear 63 as lubricating oil. Further, another part of the scraped up oil O is stored in a reservoir 65 disposed within the gear housing 61. Oil O stored in the reservoir 65 flows into the interior of the shaft 31, which will be described later.

The rotating electric machine 10 is a part that drives the drive device 100. The rotating electrical machine 10 is located on the right side of the transmission device 60, for example. In this embodiment, the rotating electric machine 10 is a motor.

The rotating electrical machine 10 includes a motor housing 20, a rotor 30 that is rotatable about a central axis J, and a stator 40 that faces the rotor 30 in the radial direction with a gap therebetween.

The motor housing 20 is a housing that accommodates the rotor 30 and stator 40 therein. The motor housing 20 is connected to the right side of the gear housing 61. The motor housing 20 has a peripheral wall portion 21, a partition wall portion 22, and a lid portion 23. The peripheral wall portion 21 and the partition wall portion 22 are, for example, parts of the same single member. The lid portion 23 is, for example, separate from the peripheral wall portion 21 and the partition wall portion 22.

The peripheral wall portion 21 has a cylindrical shape that surrounds the central axis J and opens on the right side. The partition wall 22 is connected to the left end of the peripheral wall 21. The partition wall portion 22 separates the inside of the motor housing 20 and the inside of the gear housing 61 in the axial direction. The partition wall portion 22 has a partition opening 22 a that connects the inside of the motor housing 20 and the inside of the gear housing 61 . A bearing 34 is held in the partition wall 22 . The lid part 23 is fixed to the right end of the peripheral wall part 21. The lid part 23 closes the opening on the right side of the peripheral wall part 21. A bearing 35 is held in the lid portion 23.

The stator 40 is located outside the rotor 30 in the radial direction. Stator 40 is fixed inside motor housing 20.

FIG. 2 is a schematic cross-sectional view of the rotating electrical machine 10 of this embodiment.
The stator 40 has an annular shape centered on the central axis J. Stator 40 has a stator core 41 and a coil assembly 42.

The stator core 41 has an annular shape surrounding the central axis J of the rotating electric machine 10. Stator core 41 is located on the outside of rotor 30 in the radial direction. Stator core 41 surrounds rotor 30. The stator core 41 is configured by, for example, a plurality of plate members such as electromagnetic steel plates laminated in the axial direction. Although not shown, the stator core 41 includes a cylindrical core back that extends in the axial direction, and a plurality of teeth that extend inward in the radial direction from the core back. The plurality of teeth are arranged at equal intervals all around the circumferential direction.

The coil assembly 42 has a plurality of coils 42c attached to the stator core 41. Each coil 42c is constituted by, for example, a rectangular wire having a rectangular or substantially rectangular cross-sectional shape. Note that each coil 42c may be formed of, for example, a round wire with a circular cross-sectional shape. The plurality of coils 42c are each attached to the stator core 41 via an insulator 43. The insulators 43 are arranged, for example, between the teeth of the stator core 41 in the circumferential direction. The insulator 43 is, for example, insulating paper. The insulator 43 protrudes from the stator core 41 on both sides in the axial direction. Although not shown, the coil assembly 42 may have a binding member that binds each coil 42c, or may have a crossover wire that connects each coil 42c.

The coil assembly 42 has coil ends 42a and 42b that protrude further in the axial direction than the stator core 41. The coil end 42a is a portion that protrudes to the right side of the stator core 41. The coil end 42b is a portion that protrudes to the left side of the stator core 41. Coil end 42a includes a portion of each coil 42c included in coil assembly 42 that protrudes to the right side of stator core 41. Coil end 42b includes a portion of each coil 42c included in coil assembly 42 that protrudes to the left of stator core 41. In this embodiment, the coil ends 42a and 42b have an annular shape centered on the central axis J. Although not shown, the coil ends 42a and 42b may include a binding member for binding each coil 42c, or may include a crossover wire for connecting each coil 42c. The right end of the coil end 42a is located to the right of the right end of the insulator 43. The left end of the coil end 42b is located to the left of the left end of the insulator 43.

The rotor 30 is arranged inside the stator 40. The rotor 30 includes a shaft 31, a rotor core 32, and a magnet 33. The shaft 31 extends along the central axis J. In this embodiment, the shaft 31 is a cylindrical hollow shaft that extends in the axial direction centering on the central axis J. The interior of the shaft 31, which is a hollow shaft, is a cavity 37. That is, a cavity 37 is provided inside the shaft 31. The shaft 31 is rotatable around the central axis J. As shown in FIG. 1, the shaft 31 is rotatably supported by

bearings

34 and 35.

The shaft 31 extends across the inside of the motor housing 20 and the inside of the gear housing 61. The left end of the shaft 31 projects into the gear housing 61. A speed reduction device 62 is connected to the left end of the shaft 31 . The left end of the shaft 31 opens into the gear housing 61. In other words, the left end of the cavity 37 opens into the gear housing 61 . The right end of the shaft 31 may be open or closed. That is, the right end of the cavity 37 may be open or closed. The oil O in the reservoir 65 flows into the cavity 37 from the left end of the cavity 37 . The oil O that has flowed into the cavity 37 flows inside the cavity 37 to the right.

As shown in FIG. 2, the shaft 31 is provided with a plurality of (eight in this embodiment) through holes 31a. The through hole 31a extends radially outward from the cavity 37. Further, the through hole 31a opens at the outer circumferential surface of the shaft. That is, the through hole 31a radially penetrates a portion of the shaft 31 from the inner circumferential surface of the shaft 31 to the outer circumferential surface of the shaft 31. The through hole 31a is, for example, a circular hole. In the following description, the opening of the through hole 31a on the inner circumferential surface of the shaft 31 is called an inner opening 31b, and the opening on the outer circumferential surface of the shaft 31 is called an outer opening (opening) 31c.

Four of the eight through holes 31a are located on the right side of the shaft 31 relative to the rotor core 32, and the remaining four are located on the left side of the shaft 31 relative to the rotor core 32. The four through holes 31a located on the right side of the rotor core 32 are arranged at equal intervals along the circumferential direction. Similarly, the four through holes 31a located on the left side of the rotor core 32 are arranged at equal intervals along the circumferential direction.

As shown in FIG. 2, the shaft 31 is provided with a flange portion 31e that protrudes radially outward with respect to the outer peripheral surface of the shaft 31. That is, the rotor 30 includes the flange portion 31e as a protruding portion that protrudes radially outward from the outer circumferential surface of the shaft 31. The flange portion 31e is provided on the outer peripheral surface of a portion of the shaft 31 located on the left side of the rotor core 32. The flange portion 31e and the shaft 31 are part of the same single member. The flange portion 31e has an annular shape centered on the central axis J and surrounding the shaft 31. The flange portion 31e is located on the left side of the plurality of through holes 31a. The flange portion 31e is located inside the coil end 42b in the radial direction. The left end of the flange portion 31e is located to the right of the left end of the coil end 42b. The flange portion 31e sandwiches an end plate 50b, which will be described later, between the flange portion 31e and the rotor core 32 in the axial direction.

A nut 36 is attached to the shaft 31. The nut 36 is a protrusion that protrudes radially outward from the outer peripheral surface of the shaft 31. That is, the rotor 30 includes the nut 36 as a protrusion. The nut 36 is separate from the shaft 31. The nut 36 is fixed to the outer peripheral surface of a portion of the shaft 31 located on the right side of the rotor core 32. The nut 36 has an annular shape centered on the central axis J and surrounding the shaft 31. The inner circumferential surface of the nut 36 is provided with a threaded portion that engages with a threaded portion provided on the outer circumferential surface of the shaft 31 . The nut 36 is located on the right side of the plurality of through holes 31a. The outer diameter of the nut 36 is larger than the outer diameter of the flange portion 31e. The nut 36 is located radially inside the coil end 42a. The right end of the nut 36 is arranged at approximately the same position in the axial direction as the right end of the coil end 42a. The nut 36 sandwiches an end plate 50a, which will be described later, between the nut 36 and the rotor core 32 in the axial direction.

The rotor core 32 is fixed to the shaft 31. The rotor core 32 has a cylindrical shape that surrounds the shaft 31 and extends in the axial direction. The inner peripheral surface of the rotor core 32 is fixed to the outer peripheral surface of the shaft 31. The rotor core 32 is configured by laminating a plurality of plate members, such as electromagnetic steel plates, in the axial direction. The rotor core 32 has a magnet hole 32a that passes through the radially outer portion of the rotor core 32 in the axial direction. A plurality of magnet holes 32a are provided at intervals in the circumferential direction.

The magnet 33 is fixed to the rotor core 32. A plurality of magnets 33 are provided. The plurality of magnets 33 are respectively inserted into the plurality of magnet holes 32a. Each of the plurality of magnets 33 extends in the axial direction. The axial dimension of the magnet 33 is approximately the same as the axial dimension of the rotor core 32.

The rotor 30 includes an end plate 50 arranged in line with the rotor core 32 in the axial direction. The rotor 30 of this embodiment includes two end plates 50: an end plate 50a placed on the right side of the rotor core 32, and an end plate 50b placed on the left side of the rotor core 32.

The two

end plates

50a and 50b are arranged to sandwich the rotor core 32 in the axial direction. The two

end plates

50a and 50b are sandwiched between the nut 36 and the flange portion 31e and fixed to the rotor core 32 by tightening the nut 36 onto the shaft 31. By providing the nut 36 and the flange portion 31e as protrusions in this way, it is possible to suppress the

end plates

50a, 50b from shifting in the axial direction with respect to the rotor core 32.

Each

end plate

50a, 50b closes both axial ends of the magnet hole 32a. As a result, the magnet 33 is held down from both sides in the axial direction by the

end plates

50a and 50b, and the magnet 33 is prevented from protruding from the magnet hole 32a in the axial direction. The end plate 50a and the end plate 50b mainly have the same configuration except that they are arranged symmetrically in the axial direction with the rotor core 32 in between. Therefore, in the following description, only the end plate 50a may be described as a representative. In the following description, when two end plates 50 are to be distinguished from each other, one located on the right side of the rotor core 32 is referred to as a first end plate 50a, and the other located on the left side of the rotor core 32 is referred to as a second end plate 50b. There is.

In the following description of the end plates 50, one side in the axial direction is the side opposite to the side where the rotor core 32 is located with respect to each end plate 50, and the other side in the axial direction is the side where the rotor core 32 is located with respect to each end plate 50. It's on the side. Therefore, in the first end plate 50a, one axial side means the right side (+Y side), and the other axial side means the left side (-Y side). Similarly, in the second end plate 50b, one axial side means the left side (-Y side), and the other axial side means the right side (+Y side).

FIG. 3 is a perspective view showing the end plate 50a of this embodiment. FIG. 4 is a partially enlarged view of FIG. 3. FIG. 5 is an axial view of the end plate 50a of this embodiment. Note that FIG. 5 shows a cross section of the shaft 31 inserted into the end plate 50a.

As shown in FIG. 5, the end plate 50a has an annular shape centered on the central axis J. The end plate 50a is a plate-shaped member whose plate surface faces in the axial direction. The end plate 50a is provided with an insertion hole 50h into which the shaft 31 is inserted.

As shown in FIG. 2, the outer diameter of the end plate 50a is approximately the same as the outer diameter of the rotor core 32. The end plate 50a is arranged radially inside the coil end 42a with a gap. The other end of the end plate 50a in the axial direction (+Y side) is in contact with the rotor core 32. The end of the end plate 50a on one axial side (-Y side) is located on the other axial side (+Y side) of the end of the coil end 42a on the one axial side (-Y side).

By removing a portion of the end plate 50a by cutting, it can also function as a balancer that corrects the balance of the rotor 30 in the circumferential direction. By using the end plate 50a as a balancer, it is possible to suppress deterioration of the magnetic properties of the rotor 30 compared to the case where the balance of the rotor 30 is adjusted by cutting the rotor core 32.

The end plate 50a has a first side surface 51 facing one side in the axial direction (-Y side) and a second side surface 52 facing the other side in the axial direction (+Y side). The first side surface 51 and the second side surface 52 are flat surfaces perpendicular to the central axis J.

As shown in FIG. 3, the first side surface 51 includes a plurality of (four in this embodiment) first recesses 53 that are recessed toward the other side in the axial direction (+Y side), one second recess 54, and a plurality of ( In this embodiment, four groove portions 55 are provided.

The plurality of first recesses 53 are arranged at equal intervals along the circumferential direction. The plurality of first recesses 53 are located between the grooves 55 arranged in the circumferential direction. According to this embodiment, by providing the first recess 53 in the end plate 50a, it is possible to reduce the overall weight while leaving a cutting allowance for balance adjustment. Further, by arranging the plurality of first recesses 53 at equal intervals along the circumferential direction, it is possible to suppress deterioration of the weight balance of the end plate 50a due to the first recesses 53.

The first recess 53 of this embodiment has a groove shape extending along the circumferential direction. According to this embodiment, by forming the first recess 53 in the shape of a groove extending in the circumferential direction, variations in the weight distribution of the end plate 50a along the circumferential direction can be suppressed. Moreover, the dimension along the radial direction of the first recess 53 of this embodiment gradually becomes smaller toward one side in the circumferential direction. By changing the radial dimension of the first recess 53 along the circumferential direction, the first recess 53 can be arranged over the entire first side surface 51 of the end plate 50a while avoiding the groove 55.

The second recess 54 has a circular shape centered on the central axis J when viewed from the axial direction. The second recess 54 has a bottom surface 54a facing one side in the axial direction (-Y side). As shown in FIG. 2, the second recess 54 contacts the nut 36 (or the flange portion 31e) as a protrusion at the bottom surface 54a. A portion of the end plate 50a that contacts the nut 36 is reinforced by being sandwiched between the nut 36 and the rotor core 32 from both sides in the axial direction. Therefore, even if the portion of the end plate 50a that contacts the nut 36 is made thinner in the axial direction, sufficient rigidity can be ensured. According to this embodiment, by providing the first recess 53 in the end plate 50a, it is possible to reduce the weight of the end plate 50a without impairing the rigidity of the end plate 50a.

As shown in FIG. 3, the groove portion 55 extends radially outward from the inner edge of the end plate 50. The groove portion 55 guides the oil O discharged from the opening of the through hole 31a of the shaft 31 to the outside in the radial direction. In the following description of the groove portion 55, each portion of the groove portion 55 may be described as an upstream side or a downstream side based on the flow direction of the oil O within the groove portion 55. The oil O flows in one direction within the groove portion 55 due to the centrifugal force accompanying the rotation of the rotor 30. Therefore, a region on the downstream side with respect to a given portion of the groove portion 55 is located radially outward than a region on the upstream side with respect to that portion.

The groove 55 has a first end 56 that is an upstream end and a second end 57 that is a downstream end. Oil O in the groove 55 flows from the first end 56 to the second end 57.

The first end 56 is located at the inner edge of the end plate 50a. The first end portion 56 is located at the innermost position in the radial direction in the groove portion 55 . The circumferential position of the first end 56 coincides with the circumferential position of the outer opening 31c of the through hole 31a of the shaft 31. Therefore, the first end 56 faces the outer opening 31c in the radial direction. The first end 56 is connected to the opening of the through hole 31a. The first end 56 of the groove 55 may be directly connected to the outer opening 31c, or may be connected indirectly through a gap. Oil O discharged from the outer opening 31c of the through hole 31a is guided into the groove 55 from the first end 56.

The second end 57 is located near the outer edge of the end plate 50a. The second end portion 57 is located at the outermost position in the radial direction in the groove portion 55 . That is, the second end 57 is located radially outward from the first end 56. The second end portion 57 opens radially outward. The oil O in the groove portion 55 scatters radially outward from the second end portion 57.

The groove portion 55 has a first flow path portion 81 and a second flow path portion 82 that is connected to the first flow path portion 81 on the upstream side of the first flow path portion 81 . Therefore, the boundary portion 89 between the first flow path portion 81 and the second flow path portion 82 is located at the upstream end of the first flow path portion 81 and the downstream end of the second flow path portion 82. do. The oil O flows through the groove portion 55 in the order of the second flow path portion 82 and the first flow path portion 81 .

The first flow path portion 81 and the second flow path portion 82 each extend linearly when viewed from the axial direction. The first flow path portion 81 extends in a direction inclined with respect to the radial direction when viewed from the axial direction. On the other hand, the second flow path portion 82 extends in the radial direction when viewed from the axial direction. In this embodiment, the first flow path section 81 and the second flow path section 82 are orthogonal to each other when viewed from the axial direction.

Note that in this specification, the "radial direction" is a direction in which a straight line passing through the central axis J extends within a plane orthogonal to the central axis J. Moreover, the "direction inclined with respect to the radial direction" is a direction inclined with respect to the above-mentioned "radial direction" within a plane orthogonal to the central axis J.

Here, as shown in FIG. 5, the steady rotation direction +θ is determined. In this embodiment, the steady rotation direction +θ is the rotation direction of the rotor 30 when the vehicle moves forward. In this embodiment, the first flow path portion 81 extends from the boundary portion 89 toward the opposite side of the steady rotation direction +θ. That is, the first flow path portion 81 extends radially outwardly so as to be inclined toward one side in the circumferential direction (in the present embodiment, the steady rotation direction +θ).

In this embodiment, the first end portion 56 of the groove portion 55 is located in the second flow path portion 82. The first end 56 is the upstream end of the second flow path section 82 . The oil O that has flowed from inside the cavity 37 to the outside of the shaft 31 through the through hole 31 a flows into the first end 56 of the groove 55 . According to this embodiment, the second flow path portion has a first end portion 56 and extends in the radial direction. Therefore, the oil O flowing out from the outer opening 31c of the through hole 31a of the shaft 31 is smoothly guided into the groove portion 55 by the action of centrifugal force accompanying the rotation of the rotor 30. In particular, in the present embodiment, the through hole 31a and the second flow path portion 82 in which the first end portion 56 is provided are arranged in the same straight line extending in the radial direction. According to this embodiment, the oil O smoothly flows from inside the shaft 31 into the groove 55 of the end plate 50 along the radial direction.

The oil O in the groove portion 55 flows from the second flow path portion 82 to the first flow path portion 81 at the boundary portion 89 between the first flow path portion 81 and the second flow path portion 82 . As described above, the first flow path section 81 and the second flow path section 82 each extend linearly when viewed from the axial direction. Therefore, the groove portion 55 is bent at the boundary portion 89. The groove portion 55 of this embodiment is bent at 90° at the boundary portion 89. The oil O in the groove portion 55 suddenly changes its flow direction when flowing into the first flow path portion 81 from the second flow path portion 82 . Thereby, the flow velocity of the oil O in the groove portion 55 can be reduced at the boundary portion 89. Furthermore, when the rotor 30 rotates at high speed, the flow velocity of the oil O that scatters radially outward from the second end 57 of the groove portion 55 is suppressed from increasing too much, and the scattering direction of the oil O that scatters from the second end 57 is controlled. And the scattering distance can be stabilized. As a result, it becomes possible to supply oil O to a desired position, and effective cooling of stator 40 becomes possible. Note that such an effect can be obtained if the groove portion 55 has a bent portion (boundary portion 89 in this embodiment) that bends the flow direction of the oil O.

The first flow path portion 81 extends in a direction inclined with respect to the radial direction when viewed from the axial direction. By applying centrifugal force to the oil O in the first flow path section 81, the oil O is directed toward the outside in the radial direction along the inner surface of the first flow path section 81 in a direction that is inclined with respect to the radial direction. flows. The downstream end of the first channel section 81 is the second end 57 of the groove section 55 . That is, the second end portion 57 is located in the first flow path portion 81 . The oil O in the first flow path section 81 reaches the second end section 57 and scatters toward the stator 40. More specifically, as shown in FIG. 1, oil O is supplied from the end plate 50 to the coil end 42a of the stator 40, and the coil end 42a is cooled. The oil O supplied to the coil end 42a falls downward and accumulates in the lower region within the motor housing 20. The oil O accumulated in the lower region within the motor housing 20 returns into the gear housing 61 through the partition opening 22a provided in the partition wall portion 22. In this way, in the drive device 100 of this embodiment, after the oil O scraped up by the ring gear 63a in the gear housing 61 is supplied to the coil end 42a via the gap 37 of the shaft 31 and the end plate 50a, A circulation path for oil O to return to the gear housing 61 is provided.

According to this embodiment, the direction in which the first flow path portion 81 extends is inclined with respect to the radial direction. Further, in this embodiment, the direction in which the first flow path portion 81 is inclined with respect to the radial direction is the steady rotation direction +θ. Therefore, during steady rotation of the rotor 30, the inner surface of the first flow path section 81 acts to push out the oil O within the first flow path section 81 to the outside in the radial direction. It is possible to increase the flow rate of oil O while rectifying the flow. Thereby, the oil O can be reliably scattered from the second end portion 57, and the oil O can be reliably supplied to the coil end 42a.

According to this embodiment, the second end portion 57 of the groove portion 55 is located in the first flow path portion 81. The second end 57 is the downstream end of the first flow path section 81 . By providing the second end portion 57 in the first flow path portion 81, the opening direction of the second end portion 57 can be made to be inclined with respect to the radial direction. Therefore, during steady rotation of the rotor 30, the end plate 50a is scattered from the second end 57 toward the rear side in the steady rotation direction +θ. Thereby, the oil O can be dispersed in the circumferential direction, the oil O supplied to the coil end 42a can be made into fine droplets, and the oil O can be uniformly supplied to each part of the coil end 42a.

Note that even when the rotor 30 rotates in the opposite direction to the steady rotation direction +θ, the oil O is scattered from the second end portion 57 of the groove portion 55, but the oil O is accelerated within the first flow path portion 81. It is difficult to do so, and the scattering speed of oil O becomes small. Note that rotating the rotor 30 in the opposite direction to the steady rotation direction +θ means that the vehicle moves backward. Since the rotational speed of the rotating electrical machine 10 is slow and the rotation time is short when the vehicle moves backward, the reliability of the rotating electrical machine 10 can be sufficiently ensured even if the scattering speed decreases and the cooling effect decreases.

As shown in FIG. 5, when viewed from the axial direction, a portion of the groove portion 55 overlaps with the nut 36 as a protruding portion. More specifically, when viewed from the axial direction, the first end 56 of the groove 55 overlaps the nut 36, and the second end 57 of the groove 55 is located on the outer side of the nut 36 in the radial direction.

According to the present embodiment, the first end portion 56 of the groove portion 55 is covered by the nut 36 from one side in the axial direction (−Y side). As a result, the groove 55 and the nut 36 can form a flow path for sending the oil O to the outside in the radial direction, allowing the oil O to flow more suitably within the groove 55. Further, the nut 36 can prevent the oil O flowing in the groove portion 55 from scattering in the axial direction. Furthermore, since the second end 57 of the groove 55 is not covered by the nut 36, the groove 55 does not allow the oil O to scatter from the second end 57 toward one side in the axial direction (-Y side). can.

As shown in FIG. 4, the inner surface of the groove portion 55 has a groove bottom surface 55d located on the side where the rotor core 32 is located in the axial direction, that is, on the other axial side (+Y side). The groove bottom surface 55d is a surface facing one side in the axial direction (-Y side) and extends in the radial direction when viewed in the axial direction.

In this embodiment, the radially inner end 55de of the groove bottom surface 55d is disposed radially outward from the shaft 31. Therefore, even if the axial position of the end plate 50a with respect to the through hole 31a deviates due to dimensional tolerances, assembly tolerances, etc., the outer opening 31c of the through hole 31a is closed by the portion of the end plate 50a where the groove bottom surface 55d is provided. can be suppressed. Thereby, it is possible to suppress the oil O from flowing into the groove portion 55 through the through hole 31a.

The groove bottom surface 55d has a first surface 55a, a second surface 55b, and a third surface 55c. The first surface 55a, the third surface 55c, and the second surface 55b are continuously connected in this order from the upstream side to the downstream side of the groove portion 55.

The second surface 55b is located at the second end 57 of the groove 55. Further, the second surface 55b is provided in the first flow path section 81. The second surface 55b is inclined toward one side in the axial direction (-Y side) as it goes radially outward. In other words, the second surface 55b is a surface that axially moves away from the rotor core 32 as it goes radially outward.

FIG. 6 is a cross-sectional view of the end plate 50a along the direction in which the first flow path section 81 extends. In FIG. 6, illustrations of the rotor core 32, stator core 41, etc. are partially omitted.

The second surface 55b gives a velocity component on one axial side (-Y side) to the oil O flowing radially outward along the second surface 55b, as shown by the arrow in FIG. Thereby, the oil O injected from the second end 57 of the groove portion 55 toward the coil end 42a can be easily blown to a position further away from the rotor core 32 in the axial direction. Therefore, it is easy to suitably supply oil O to a portion of the coil end 42a that is relatively far away from the rotor core 32 in the axial direction. Further, the oil O injected from the groove portion 55 toward the coil end 42a spreads to some extent in the axial direction and scatters. Therefore, oil O is also supplied to a portion of the coil end 42a that is relatively close to the rotor core 32 in the axial direction. As described above, according to the present embodiment, oil O as a refrigerant can be easily supplied to the entire coil end 42a via the end plate 50a.

For example, if the axial position of the outer opening 31c of the through hole 31a is set further away from the rotor core 32 in the axial direction, the oil O flowing out from the outer opening 31c is transferred from the rotor core 32 in the axial direction of the coil end 42a. It can be easily supplied to relatively far away areas. However, in this case, it is necessary to increase the size of the end plate 50a in the axial direction, causing a problem that the mass of the rotor 30 increases.

On the other hand, according to the present embodiment, the oil O flowing out from the outer opening 31c is transferred to the rotor core in the axial direction of the coil end 42a without making the axial position of the outer opening 31c a large distance from the rotor core 32. It can be easily supplied to parts relatively far away from 32. Therefore, it is possible to easily supply oil O as a refrigerant to the coil end 42a via the end plate 50a while suppressing an increase in the mass of the rotor 30 and an increase in the size of the rotor 30 in the axial direction.

If the coil 42c constituting the coil end 42a is made of a rectangular wire, the axial dimension of the coil end 42a tends to be large. Therefore, among the axial ends of the coil end 42a, the axial end farthest from the rotor core 32 is likely to be disposed at a position far from the rotor core 32, making it difficult to supply oil O. According to the present embodiment, as described above, it is possible to easily supply oil O to a portion of the coil end 42a that is axially distant from the rotor core 32. Therefore, even if the coil 42c is made of a rectangular wire and the axial dimension of the coil end 42a becomes large, oil O can be suitably supplied to the coil end 42a.

In the present embodiment, the inclination angle θb of the second surface 55b with respect to the plane perpendicular to the axial direction is, for example, approximately 5° or more and 30° or less. The radially outer end of the second surface 55b is the radially outer end of the groove bottom surface 55d. Therefore, the direction of the oil O injected from the groove portion 55 toward the coil end 42a is easily set along the second surface 55b, and the oil O is directed to a portion of the coil end 42a that is relatively far away from the rotor core 32 in the axial direction. It is easier to supply it more suitably. Note that the inclination angle θb may be greater than 30° and less than 90°, or may be greater than 0° and less than 5°.

As shown in FIG. 6, in the cross section along the axial direction, the imaginary line IL extending radially outward from the radially outer end of the second surface 55b in the direction along the second surface 55b is the coil end 42a. is passing through. Therefore, the oil O injected radially outward from inside the groove portion 55 along the second surface 55b can be more suitably supplied to the coil end 42a.

The virtual line IL is a line that extends obliquely in the axial direction with respect to the radial direction, and is located on one axial side (-Y side) as it goes radially outward. The inclination of the virtual line IL with respect to the radial direction is the same as the inclination of the second surface 55b with respect to the radial direction. The position where the virtual line IL intersects with the coil end 42a is a position further away from the stator core 41 in the axial direction than the axial center CL1 of the coil end 42a. Therefore, the oil O injected radially outward from inside the groove portion 55 along the second surface 55b can be easily supplied to a portion of the coil end 42a that is further away in the axial direction from the stator core 41 than the axial center CL1. This makes it easier to more appropriately supply oil O to a portion of the coil end 42a that is relatively far away from the rotor core 32 in the axial direction.

In this embodiment, "a portion of the coil end 42a that is relatively far away from the rotor core 32 in the axial direction" refers to, for example, a portion of the coil end 42a that is axially farther away from the rotor core 32 than the center CL1 in the axial direction. ie, a portion of the coil end 42a located on one side in the axial direction (-Y side) with respect to the center CL1. In the present embodiment, "a portion of the coil end 42a that is relatively close to the rotor core 32 in the axial direction" refers to, for example, a portion of the coil end 42a that is located axially closer to the rotor core 32 than the axial center CL1. , that is, a portion of the coil end 42a located on the other axial side (+Y side) of the center CL1. The center CL1 in the axial direction of the coil end 42a may be included in "a portion of the coil end 42a that is relatively far away from the rotor core 32 in the axial direction," or may be included in the "portion of the coil end 42a that is relatively far away from the rotor core 32 in the axial direction." may be included in the "portion relatively close to".

In this embodiment, the position where the imaginary line IL and the coil end 42a intersect is a portion of the coil end 42a that protrudes from the stator core 41 in the axial direction more than the insulator 43, that is, one of the coil ends 42a in the axial direction than the insulator 43. This is approximately the same position in the axial direction as the axial center CL2 of the portion located on the side (−Y side). More specifically, the position where the virtual line IL and the coil end 42a intersect is slightly closer to the stator core 41 in the axial direction than the center CL2. The position where the imaginary line IL and the coil end 42a intersect is the same in the axial direction as the axial center CL2 of the portion of the coil end 42a that protrudes from the stator core 41 in the axial direction beyond the insulator 43, or the position where the stator core is more than the center CL2. 41 in the axial direction, the oil O injected radially outward from inside the groove 55 along the second surface 55b is directed to a portion of the coil end 42a that is relatively close to the rotor core 32 in the axial direction. This can prevent the supply from becoming difficult. Therefore, the oil O can be easily supplied to the coil end 42a.

As shown in FIG. 4, the first surface 55a is located at the first end 56 of the groove 55. The first surface 55a is inclined toward one side in the axial direction (-Y side) as it goes radially outward. In other words, the first surface 55a is a surface that axially moves away from the rotor core 32 as it goes radially outward.

As shown in FIG. 2, the first surface 55a faces the outer opening 31c of the through hole 31a of the shaft 31 in the radial direction. Therefore, the oil O discharged radially outward from the through hole 31a hits the first surface 55a. Thereby, the flow of the oil O flowing radially outward from the outer opening 31c can be adjusted by the first surface 55a before flowing into the groove portion 55. As a result, the flow of the oil O in the groove 55 can be stabilized, and as a result, the scattering of the oil O from the second end 57 of the groove 55 can be stabilized. Therefore, oil O can be stably and suitably supplied to the coil end 42a.

In addition, in this specification, "certain objects are facing each other in a certain direction" may mean that certain objects overlap at least in part when viewed in a certain direction; The shape and direction of the portions of the objects facing the other object may be in any direction. For example, "the first surface 55a faces the outer opening 31c in the radial direction" means that the first surface 55a and the outer opening 31c face each other in at least one radial direction passing through the outer opening 31c. 31c, it is sufficient that they overlap at least in part, and it is not necessary that the first surface 55a and the outer opening 31c face each other in parallel. In this embodiment, the direction perpendicular to the first surface 55a is the direction intersecting the direction in which the outer opening 31c opens.

In this embodiment, the radially inner end of the first surface 55a is the radially inner end of the groove bottom surface 55d. Therefore, the radially inner end of the groove bottom surface 55d can be disposed at a position close to the rotor core 32 in the axial direction while being inclined obliquely with respect to the radial direction. Thereby, the oil O flowing out from the outer opening 31c of the through hole 31a can be easily guided into the groove portion 55 by the radially inner end of the groove bottom surface 55d, that is, the radially inner end of the first surface 55a. . According to this embodiment, the oil O flowing out from the outer opening 31c can be easily caused to flow into the groove portion 55.

The first surface 55a of this embodiment is provided in the second flow path section 82. As described above, since the second flow path portion 82 extends in the radial direction, it is possible to smoothly guide the oil O flowing out from the through hole 31a of the shaft 31 to the outside in the radial direction. Further, by providing the first surface 55a in the second flow path portion 82, the oil flowing out radially outward from the through hole 31a can be reliably applied to the first surface 55a.

As shown in FIG. 4, the first surface 55a is a planar inclined surface that extends linearly and is inclined in the axial direction with respect to the radial direction. The inclination angle θa of the first surface 55a with respect to a plane perpendicular to the axial direction is larger than the inclination angle θb of the second surface 55b, which will be described later. Therefore, the radial dimension of the first surface 55a can be made relatively small, and the radially outer end of the first surface 55a can be positioned away from the rotor core 32 in the axial direction. Thereby, while suitably adjusting the axial position of the second surface 55b using the first surface 55a, it is possible to prevent the first surface 55a from becoming too large in the radial direction. Therefore, while setting the inclination angle θb of the second surface 55b to a suitable angle, it is easy to adjust the axial and radial positions of the second surface 55b using the first surface 55a. Moreover, it is easy to apply the oil O flowing out from the outer opening 31c to the first surface 55a, and it is easy to adjust the flow of the oil O more suitably by the first surface 55a. The inclination angle θa of the first surface 55a with respect to the plane perpendicular to the axial direction is, for example, approximately 5° or more and 30° or less. The inclination angle θa may be greater than 30° and less than 90°, or may be greater than 0° and less than 5°.

The dimension of the first surface 55a in the direction in which the first surface 55a extends is smaller than the dimension of the second surface 55b in the direction in which the second surface 55b extends. The radial dimension of the first surface 55a is smaller than the radial dimension of the second surface 55b. The axial dimension of the first surface 55a is smaller than the axial dimension of the second surface 55b. The radially outer end of the first surface 55a is located at the same position in the axial direction as the radially inner end of the second surface 55b.

The third surface 55c is a surface that connects the second surface 55b and the first surface 55a. The third surface 55c is provided between both the first flow path section 81 and the second flow path section 82. The third surface 55c is a flat surface along a plane perpendicular to the axial direction. Therefore, the oil O prepared by applying it to the first surface 55a can suitably flow radially outward along the third surface 55c. This makes it easy to increase the flow velocity of the oil O after hitting the first surface 55a, and allows the oil O to flow along the second surface 55b while the flow velocity of the oil O is relatively high. Therefore, it is easy to suitably increase the force of the oil O injected from the second surface 55b to the coil end 42a, and the oil O can be more suitably supplied to the coil end 42a. Further, while keeping the axial position of the radially inner end of the second surface 55b the same as the axial position of the radially outer end of the first surface 55a, the oil O is radially applied along the third surface 55c. It can be guided outward. Therefore, the oil O can be guided to the second surface 55b without changing the axial and radial positions of the second surface 55b adjusted by the first surface 55a.

The third surface 55c extends in the radial direction. The radially inner end of the third surface 55c is connected to the radially outer end of the first surface 55a. The radially outer end of the third surface 55c is connected to the radially inner end of the second surface 55b. The dimension of the third surface 55c in the direction in which the third surface 55c extends is larger than the dimension of the first surface 55a in the direction in which the first surface 55a extends, and the dimension of the second surface 55b in the direction in which the second surface 55b extends. small. The radial dimension of the third surface 55c is larger than the radial dimension of the first surface 55a and smaller than the radial dimension of the second surface 55b.

As shown in FIG. 5, the end plate 50a has a plurality of grooves 55. The plurality of groove portions 55 are arranged at equal intervals in the circumferential direction. Therefore, the oil O injected radially outward from the plurality of grooves 55 can be supplied to the coil end 42a in a well-balanced manner in the circumferential direction. Thereby, the coil end 42a can be easily cooled suitably over the entire circumference. In this embodiment, four groove portions 55 are provided. The four groove portions 55 are arranged at 90° intervals in the circumferential direction. The radially inner end of each of the four groove portions 55 is connected to the outer opening 31c of the four through holes 31a, respectively.

FIG. 7 is a perspective view of the end plate 50a viewed from the second side surface 52 side.
As shown in FIG. 7, the second side surface 52 of the end plate 50a includes a third recess 58 surrounding the insertion hole, and a recess groove 59 located on the radially outer side of the third recess 58 and extending along the circumferential direction. is provided. The third recess 58 and the groove 59 are recessed from the second side surface 52 toward one side in the axial direction (−Y side). The third recess 58 has a circular shape centered on the central axis when viewed from the axial direction. Further, the groove portion 59 extends in an annular shape centered on the central axis J. Note that the groove portion 59 does not necessarily have to be annular as long as it extends along the circumferential direction. According to this embodiment, the weight of the end plate 50a can be further reduced.

As shown in FIG. 5, the outer peripheral surface of the shaft 31 is circular when viewed from the axial direction. Furthermore, the insertion hole 50h of the end plate 50a is circular when viewed from the axial direction. A plurality of (two in this embodiment) protrusions 50k that protrude radially inward are provided on the inner edge of the insertion hole 50h. Further, the outer circumferential surface of the shaft 31 is provided with a plurality of (two in this embodiment) accommodation recesses 31k into which the projections 50k are inserted. Moreover, the accommodation recess 31k is arranged between the through holes 31a in the circumferential direction.

The accommodation recess 31k is recessed radially inward. In this embodiment, the accommodation recess 31k has a groove shape extending along the axial direction. By inserting the protrusion 50k into the accommodation recess 31k, relative movement of the end plate 50a with respect to the shaft 31 in the circumferential direction is suppressed. Thereby, the end plate 50a can be precisely positioned with respect to the shaft 31 in the circumferential direction. Therefore, the circumferential position of the outer opening 31c of the through hole 31a can be suitably adjusted to the circumferential position of the groove portion 55. Therefore, the oil O flowing out from the outer opening 31c can suitably flow into the groove portion 55.

Note that such an effect can be obtained even if a protrusion is provided on the outer peripheral surface of the shaft 31 and a housing recess is provided on the inner edge of the insertion hole. That is, either the outer peripheral surface of the shaft 31 or the inner edge of the insertion hole is provided with a plurality of protrusions that protrude toward the other side, and the other is provided with a plurality of accommodation recesses into which the protrusions are inserted. It would be fine if it was.

As shown in FIG. 2, the second end plate 50b has the same configuration as the first end plate 50a located on the right side of the rotor core 32. In this embodiment, the second end plate 50b can have the same shape as the first end plate 50a. In this case, the shape of the groove portion 55 of the second end plate 50b is reversed from that of the first end plate 50a with respect to the steady rotation direction +θ. Therefore, the first end plate 50a can efficiently diffuse the oil O during steady rotation, while the second end plate 50b can efficiently diffuse the oil O during rotation in the opposite direction to the steady rotation.

Note that the second end plate 50b may have a shape that is bilaterally symmetrical to the first end plate 50a. In this case, the shape of the groove portion 55 of the second end plate 50b has the same configuration as that of the first end plate 50a in the steady rotation direction +θ. Therefore, like the first end plate 50a, the second end plate 50b can efficiently diffuse the oil O during steady rotation.

As shown in FIG. 1, in this embodiment, the drive device 100 is provided with a refrigerant flow path 90 through which oil O as a refrigerant circulates. The coolant flow path 90 is provided across the inside of the motor housing 20 and the inside of the gear housing 61. The coolant flow path 90 is a path through which oil O stored in the gear housing 61 is supplied to the rotating electrical machine 10 and returns to the gear housing 61 again. The refrigerant flow path 90 is provided with a pump 71, a cooler 72, and a refrigerant supply section 94. The refrigerant flow path 90 includes a first refrigerant flow path 91 , a second refrigerant flow path 92 , a third refrigerant flow path 93 , and a refrigerant supply section 94 .

The first refrigerant flow path 91, the second refrigerant flow path 92, and the third refrigerant flow path 93 are provided in the wall of the gear housing 61, for example. The first refrigerant flow path 91 connects the pump 71 with a portion of the inside of the gear housing 61 where oil O is stored. The second refrigerant flow path 92 connects the pump 71 and the cooler 72. The third refrigerant flow path 93 connects the cooler 72 and the inside of the refrigerant supply section 94 . In this embodiment, the third refrigerant flow path 93 is connected to the end of the refrigerant supply section 94 on the other axial side (+Y side).

The refrigerant supply section 94 is provided inside the motor housing 20. In this embodiment, the refrigerant supply section 94 has a tubular shape extending in the axial direction. In other words, in this embodiment, the refrigerant supply section 94 is a pipe extending in the axial direction. Both axial ends of the refrigerant supply section 94 are supported by the motor housing 20. The other end of the refrigerant supply section 94 in the axial direction (+Y side) is supported by the partition wall section 22, for example. One axial end (-Y side) of the refrigerant supply section 94 is supported by the lid section 23, for example. Refrigerant supply section 94 is located on the radially outer side of stator 40 . In this embodiment, the refrigerant supply section 94 is located above the stator 40.

The refrigerant supply section 94 has a supply port 94a that supplies oil O as a refrigerant to the stator 40. In the present embodiment, the supply port 94 a is an injection port that injects a part of the oil O that has flowed into the refrigerant supply section 94 to the outside of the refrigerant supply section 94 . A plurality of supply ports 94a are provided. A plurality of supply ports 94a are provided at intervals in the axial direction. The axial positions of the plurality of supply ports 94a are included in the axial position of the stator core 41. The plurality of supply ports 94a are located on the other axial side (+Y side) of the coil end 42a and on one axial side (−Y side) of the coil end 42b.

The plurality of supply ports 94a are open toward the stator core 41. Therefore, the oil O injected from the plurality of supply ports 94a is supplied to the stator core 41. Thereby, the stator core 41 can be cooled by the oil O. Here, the oil O supplied to the stator core 41 easily travels along the surface of the stator core 41 and reaches a portion of each

coil end

42a, 42b that is relatively close to the stator core 41 in the axial direction. Therefore, the portions of the coil ends 42a and 42b that are relatively close to the stator core 41 in the axial direction are easily cooled by the oil O supplied to the stator 40 from the supply port 94a. Therefore, the position where the virtual line IL and the coil end 42a intersect is a position relatively far away from the stator core 41 in the axial direction, and the

grooves

55 and 57 are compared with each other in the axial direction from the stator core 41 among the coil ends 42a and 42b. Even if the oil O is likely to be injected to an off-target position, it is possible to prevent a portion of the coil ends 42a, 42b that is relatively close to the stator core 41 in the axial direction from becoming difficult to cool. Therefore, oil O as a refrigerant can be easily supplied to the entire coil ends 42a and 42b.

In this embodiment, the refrigerant supply section 94 does not have a supply port that opens toward the coil ends 42a, 42b, and a supply port that directly supplies oil O to the coil ends 42a, 42b. Thereby, the amount of oil O supplied from the refrigerant supply section 94 to the stator core 41 can be suitably increased. In this embodiment, since the oil O can be suitably supplied from the cavity 37 of the shaft 31 to the coil ends 42a, 42b via the

end plates

50a, 50b, the oil O can be supplied from the refrigerant supply section 94 to the coil ends 42a, 42b. Even if O is not supplied, insufficient cooling of the coil ends 42a and 42b can be suppressed. Although the refrigerant supply section 94 does not have a supply port that actively supplies oil O to the coil ends 42a and 42b, as described above, the oil supplied from the refrigerant supply section 94 to the stator core 41 It is possible that some of the O flows to the coil ends 42a, 42b.

When the pump 71 is driven, the oil O stored in the gear housing 61 is sucked up through the first refrigerant flow path 91 and flows into the cooler 72 through the second refrigerant flow path 92. The oil O that has flowed into the cooler 72 is cooled within the cooler 72 and then flows into the refrigerant supply section 94 through the third refrigerant flow path 93 . The oil O that has flowed into the refrigerant supply section 94 is injected from the supply port 94a and supplied to the stator 40.

The oil O supplied to the stator 40 from the supply port 94a removes heat from the stator 40. The oil O that has cooled the stator 40 falls downward and accumulates in the lower region within the motor housing 20. The oil O accumulated in the lower region within the motor housing 20 returns into the gear housing 61 through the partition opening 22a provided in the partition wall portion 22.

As described above, in this embodiment, the oil O is swept up by the ring gear 63a and then flows into the cavity 37 of the shaft 31 via the reservoir 65, and supplies the oil O from the

grooves

55 and 57 to the coil ends 42a and 42b. The rotating electrical machine 10 can be cooled by two routes: and a route for supplying oil O to the stator 40 through the refrigerant flow path 90.

<Modified example>
Next, a modified end plate that can be employed in the rotor 30 of the above-described embodiment will be described. In addition, in the description of each modified example described below, the same reference numerals are given to the same components as those of the already described embodiment or modified example, and the description thereof will be omitted.

(Modification 1)
FIG. 8 is an axial view of the end plate 150 of Modification 1.
Similar to the embodiment described above, a groove 155 is provided on the first side surface 151 of the end plate 150 of this modification. The groove portion 155 of this modification includes a first flow path portion 181, a second flow path portion 182, a third flow path portion 183, a first branch portion 189, a first end portion 156, a second end portion 157, and a third end. 158. The groove portion 155 is connected to the through hole 31a of the shaft 31 at the first end portion 156. Oil O flows into the groove 155 from the first end 156 . Further, the groove portion 155 scatters the internal oil O outward in the radial direction at the second end portion 157 and the third end portion 158.

The first branch portion 189 is located radially outside the first end 156 , radially inside the second end 157 , and radially inside the third end 158 . The first flow path portion 181 , the second flow path portion 182 , and the third flow path portion 183 are connected to each other at the first branch portion 189 . The first branch portion 189 is located at the upstream end of the first flow path portion 181 , the upstream end of the third flow path portion 183 , and the downstream end of the second flow path portion 182 . The first branch portion 189 is located at the boundary between the first flow path portion 181 and the second flow path portion 182. Further, the first branch portion 189 is located at the boundary between the first flow path portion 181 and the third flow path portion 183. The oil O reaches the first branch section 189 from the second flow path section 182, branches at the first branch section 189, and flows into the first flow path section 181 and the third flow path section 183, respectively. The first flow path section 181, the second flow path section 182, and the third flow path section 183 each extend linearly when viewed from the axial direction.

The second flow path section 182 is connected to the first flow path section 181 and the third flow path section 183 on the upstream side of the first flow path section 181 and the third flow path section 183. The second flow path portion 182 extends in the radial direction when viewed from the axial direction. The second flow path portion 182 is provided with a first end portion 156 and is connected to the through hole 31a of the shaft 31. The second flow path portion 182 guides the oil O flowing from the through hole 31a to the outside in the radial direction.

The first flow path portion 181 is connected to the second flow path portion 182 at a first branch portion 189. The first flow path portion 181 extends in a direction inclined with respect to the radial direction. In this modification, the first flow path section 181 and the second flow path section 182 are orthogonal to each other when viewed from the axial direction. The second end portion 157 is located in the first flow path portion 181 . The second end portion 157 is arranged radially outward from the first branch portion 189.

The third flow path portion 183 is connected to the second flow path portion 182 at the first branch portion 189. The third flow path portion 183 branches from the first branch portion 189 . The third flow path portion 183 extends in the radial direction when viewed from the axial direction. In this modification, the third flow path section 183 and the second flow path section 182 continuously extend in the same straight line when viewed from the axial direction. The third end portion 158 is located in the third flow path portion 183. The third end portion 158 is arranged radially outward from the first branch portion 189.

According to this modification, the first branch part 189 is provided in the groove part 155, and the oil O branched at the first branch part 189 can be scattered from the second end part 157 and the third end part 158. can. Therefore, the opening directions of the second end 157 and the third end 158 can be set in different directions in the circumferential direction, and the oil O can be appropriately scattered no matter which direction the rotor 30 rotates. be able to. Furthermore, since the third flow path portion 183 is linearly connected to the first flow path portion 181, it is difficult for the oil O to decelerate inside the groove portion 155 until it reaches the third end portion 158. Therefore, the oil O can be scattered at high speed from the third end portion 158.

(Modification 2)
FIG. 9 is an axial view of the end plate 250 of Modification 2. As shown in FIG.
Similar to the embodiment described above, a groove 255 is provided on the first side surface 251 of the end plate 250 of this modification. The groove portion 255 of this modification includes a first flow path portion 281 , a second flow path portion 282 , a third flow path portion 283 , a boundary portion 288 , a first branch portion 289 , a first end portion 256 , a second end portion 257 and a third end 258. The groove portion 255 is connected to the through hole 31a of the shaft 31 at the first end portion 256. Oil O flows into the groove 255 from the first end 256 . Further, the groove portion 255 scatters the internal oil O outward in the radial direction at the second end portion 257 and the third end portion 258.

The boundary portion 288 is located at the connection portion between the first flow path portion 281 and the second flow path portion 282. The boundary portion 288 is located at the upstream end of the first flow path portion 281 and at the downstream end of the second flow path portion 282.

The first branch portion 289 is located radially outside the first end 256 , radially inside the second end 257 , and radially inside the third end 258 . The third flow path portion 283 branches from the first flow path portion 281 at a first branch portion 289 . The first branch portion 289 is located in the middle of the first flow path portion 281 and at the upstream end of the third flow path portion 283.

The oil O reaches the boundary portion 288 from the second flow path portion 282 and flows into the first flow path portion 281. Further, a portion of the oil O flowing through the first flow path portion 281 reaches the first branch portion 289, and a portion of the oil O flows through the third flow path portion 283. The first flow path portion 281, the second flow path portion 282, and the third flow path portion 283 each extend linearly when viewed from the axial direction.

The second flow path section 282 is located upstream of the first flow path section 281 and the third flow path section 283, and is connected to the first flow path section 281. The second flow path portion 282 extends in the radial direction when viewed from the axial direction. The second flow path portion 282 is provided with a first end portion 256 and is connected to the through hole 31a of the shaft 31. The second flow path portion 282 guides the oil O flowing from the through hole 31a to the outside in the radial direction.

The first flow path portion 281 is connected to the second flow path portion 282 at a boundary portion 288. The first flow path portion 281 extends in a direction inclined with respect to the radial direction. In this modification, the first flow path section 281 and the second flow path section 282 are orthogonal to each other when viewed from the axial direction. The second end portion 257 is located in the first flow path portion 281 . The second end portion 257 is arranged radially outward from the first branch portion 289.

The third flow path portion 283 branches from the first flow path portion 281 at a first branch portion 289 . The third flow path portion 283 extends in a direction inclined with respect to the radial direction. In this modification, the first flow path section 281 and the third flow path section 283 are orthogonal to each other when viewed from the axial direction. The third end portion 258 is located in the third flow path portion 283. The third end portion 258 is arranged radially outward from the first branch portion 289.

According to this modification, the first branch part 289 is provided in the groove part 255, and the oil O branched at the first branch part 289 can be dispersed and scattered from the second end part 257 and the third end part 258. Therefore, the opening directions of the plurality of ends (second end 257 and third end 258) for scattering the oil O can be set in different directions in the circumferential direction, and the rotor 30 can rotate in either direction. Even in this case, the oil O can be appropriately scattered.

(Modification 3)
FIG. 10 is an axial view of the end plate 350 of Modification 3.
Similar to the embodiment described above, a groove 355 is provided on the first side surface 351 of the end plate 350 of this modification. The groove portion 355 of this modification includes a first flow path portion 381, a second flow path portion 382, a third flow path portion 383, a first branch portion 389, a first end portion 356, a second end portion 357, and a third end. 358. The groove portion 355 is connected to the through hole 31a of the shaft 31 at a first end portion 356. Oil O flows into the groove portion 355 from the first end portion 356 . Further, the groove portion 355 scatters the internal oil O outward in the radial direction at the second end portion 357 and the third end portion 358.

The first branch portion 389 is located radially outside the first end 356 , radially inside the second end 357 , and radially inside the third end 358 . The first flow path portion 381 , the second flow path portion 382 , and the third flow path portion 383 are connected to each other at the first branch portion 389 . The first branch portion 389 is located at the upstream end of the first flow path portion 381, the upstream end of the third flow path portion 383, and the downstream end of the second flow path portion 382. The first branch portion 389 is located at the boundary between the first flow path portion 381 and the second flow path portion 382. Further, the first branch portion 389 is located at the boundary between the first flow path portion 381 and the third flow path portion 383. The oil O reaches the first branch section 389 from the second flow path section 382, branches at the first branch section 389, and flows into the first flow path section 381 and the third flow path section 383, respectively. The first flow path portion 381, the second flow path portion 382, and the third flow path portion 383 each extend linearly when viewed from the axial direction.

The second flow path section 382 is connected to the first flow path section 381 and the third flow path section 383 on the upstream side of the first flow path section 381 and the third flow path section 383. The second flow path portion 382 extends in the radial direction when viewed from the axial direction. The second flow path portion 382 is provided with a first end portion 356 and is connected to the through hole 31a of the shaft 31. The second flow path portion 382 guides the oil O flowing from the through hole 31a to the outside in the radial direction.

The first flow path portion 381 is connected to the second flow path portion 382 at a first branch portion 389. The first flow path portion 381 extends in a direction inclined with respect to the radial direction. In this modification, the first flow path section 381 and the second flow path section 382 are orthogonal to each other when viewed from the axial direction. The second end portion 357 is located in the first flow path portion 381 . The second end portion 357 is disposed radially outward from the first branch portion 389.

The third flow path portion 383 is connected to the second flow path portion 382 at the first branch portion 389. The third flow path portion 383 branches from the first branch portion 389 . The third flow path portion 383 extends in a direction inclined with respect to the radial direction. In this modification, the first flow path portion 381 and the third flow path portion 383 continuously extend in the same straight line when viewed from the axial direction. The third end portion 358 is located in the third flow path portion 383. The third end portion 358 is disposed radially outward from the first branch portion 389.

In this modification, the first flow path portion 381 and the third flow path portion 383 both extend in a direction inclined with respect to the radial direction, but the directions of inclination are on opposite sides in the circumferential direction. Therefore, the second end 357 and the third end 358 that scatter the oil O radially outward are disposed on the opposite side of the first branch 389 in the circumferential direction. That is, according to this modification, the opening directions of the plurality of ends (the second end 357 and the third end 358) for scattering the oil O can be set in different directions in the circumferential direction, and the rotor 30 The oil O can be appropriately scattered no matter which direction the is rotated.

(Modification 4)
FIG. 11 is an axial view of the end plate 450 of Modified Example 4.
Similar to the embodiment described above, a groove portion 455 is provided on the first side surface 451 of the end plate 450 of this modification. The groove portion 455 of this modification includes a first flow path portion 481, a second flow path portion 482, a third flow path portion 483, a first branch portion 489, a first end portion 456, a second end portion 457, and a third end. 458. The groove portion 455 is connected to the through hole 31a of the shaft 31 at a first end portion 456. Oil O flows into the groove 455 from the first end 456 . Further, the groove portion 455 scatters the internal oil O outward in the radial direction at the second end portion 457 and the third end portion 458.

The first branch portion 489 is located radially outside the first end 456, radially inside the second end 457, and radially inside the third end 458. The first flow path portion 481, the second flow path portion 482, and the third flow path portion 483 are connected to each other at the first branch portion 489. The first branch portion 489 is located at the upstream end of the first flow path portion 481, the upstream end of the third flow path portion 483, and the downstream end of the second flow path portion 482. The first branch portion 489 is located at the boundary between the first flow path portion 481 and the second flow path portion 482. Further, the first branch portion 489 is located at the boundary between the first flow path portion 481 and the third flow path portion 483. The oil O reaches the first branch section 489 from the second flow path section 482, branches at the first branch section 489, and flows into the first flow path section 481 and the third flow path section 483, respectively. The first flow path portion 481 and the second flow path portion 482 each extend linearly when viewed from the axial direction. On the other hand, as will be described later, the third flow path portion 483 is provided with a bending portion 483c in its path, and is bent at the bending portion 483c.

The second flow path section 482 is connected to the first flow path section 481 and the third flow path section 483 on the upstream side of the first flow path section 481 and the third flow path section 483. The second flow path portion 482 extends in the radial direction when viewed from the axial direction. The second flow path portion 482 is provided with a first end portion 456 and is connected to the through hole 31a of the shaft 31. The second flow path portion 482 guides the oil O flowing from the through hole 31a to the outside in the radial direction.

The first flow path portion 481 is connected to the second flow path portion 482 at a first branch portion 489. The first flow path portion 481 extends in a direction inclined with respect to the radial direction. In this modification, the first flow path section 481 and the second flow path section 482 are orthogonal to each other when viewed from the axial direction. The second end portion 457 is located in the first flow path portion 481 . The second end portion 457 is arranged radially outward from the first branch portion 489.

The third flow path portion 483 is connected to the second flow path portion 482 at the first branch portion 489. The third flow path portion 483 branches from the first branch portion 489 . The third flow path section 483 has an upstream section 483a, a downstream section 483b, and a bent section 483c. The upstream portion 483a and the downstream portion 483b are connected at a bent portion 483c. The upstream portion 483a and the downstream portion 483b are perpendicular to each other at the bent portion 483c. The upstream portion 483a extends linearly between the first branch portion 489 and the bent portion 483c. The upstream portion 483a extends in the radial direction when viewed from the axial direction. The downstream portion 483b extends linearly between the bent portion 483c and the third end portion 458. The downstream portion 483b extends parallel to the first flow path portion 481 when viewed from the axial direction. The third end portion 458 is located in the third flow path portion 483. The third end portion 458 is disposed radially outward from the first branch portion 489. The third end 458 and the second end 457 are arranged on the same circumference around the central axis J.

In this modification, the third flow path portion 483 extends in a direction inclined with respect to the radial direction at the downstream portion 483b. Further, the second end portion 457 and the third end portion 458 are arranged on the same circumferential side with respect to the first branch portion 489. According to this modification, the groove 455 has a plurality of ends (second end 457 and third end 458) that inject oil O, and further has a plurality of ends (second end 457 and third end 458). The opening directions of the three ends 458) can be the same in the circumferential direction. Thereby, the flow rate of the oil O scattered radially outward from the end plate 450 can be increased.

(Modification 5)
FIG. 12 is an axial view of the end plate 550 of Modified Example 5.
Similar to the embodiment described above, a groove portion 555 is provided on the first side surface 551 of the end plate 550 of this modification. The groove portion 555 of this modification includes a first flow path portion 581, a second flow path portion 582, a fourth flow path portion 584, a first boundary portion 588, a second boundary portion 589, a first end portion 556, and a second end portion. 557. The groove portion 555 is connected to the through hole 31a of the shaft 31 at a first end portion 556. Oil O flows into the groove portion 555 from the first end portion 556 . Further, the groove portion 555 scatters the internal oil O outward in the radial direction at the second end portion 557.

The first boundary portion 588 is located at the connection portion between the second flow path portion 582 and the fourth flow path portion 584. The first boundary portion 588 is located at the downstream end of the second flow path portion 582 and at the upstream end of the fourth flow path portion 584.

The second boundary portion 589 is located at the connection portion between the first flow path portion 581 and the fourth flow path portion 584. The second boundary portion 589 is located at the upstream end of the first flow path portion 581 and at the downstream end of the fourth flow path portion 584.

The oil O reaches the first boundary portion 588 from the second flow path portion 582 and flows into the fourth flow path portion 584. Further, the oil O flowing through the fourth flow path portion 584 reaches the second boundary portion 589 and flows into the first flow path portion 581 . The first flow path portion 581, the second flow path portion 582, and the fourth flow path portion 584 each extend linearly when viewed from the axial direction.

The second flow path section 582 is located upstream of the first flow path section 581 and the fourth flow path section 584, and is connected to the fourth flow path section 584. The second flow path portion 582 extends in the radial direction when viewed from the axial direction. The second flow path portion 582 is provided with a first end portion 556 and is connected to the through hole 31a of the shaft 31. The second flow path portion 582 guides the oil O flowing from the through hole 31a to the outside in the radial direction.

The fourth flow path portion 584 is connected to the second flow path portion 582 at a first boundary portion 588. The fourth flow path portion 584 extends in a direction inclined with respect to the radial direction. In this modification, the second flow path portion 582 and the fourth flow path portion 584 are orthogonal to each other when viewed from the axial direction. The fourth flow path section 584 connects the second flow path section 582 and the first flow path section 581.

The first flow path portion 581 is connected to the fourth flow path portion 584 at a second boundary portion 589. The first flow path portion 581 extends in a direction inclined with respect to the radial direction. In this modification, the first flow path portion 581 and the fourth flow path portion 584 are orthogonal to each other when viewed from the axial direction. The second end portion 557 is located in the first flow path portion 581. The second end portion 557 is arranged radially outward from the first boundary portion 588 and the second boundary portion 589.

According to this modification, a fourth flow path portion 584 is provided between the first flow path portion 581 and the second flow path portion 582. Thereby, the groove portion 555 can connect the first flow path portion 581 and the second flow path portion 582 while increasing the degree of freedom in arrangement and shape thereof.

(Modification 6)
FIG. 13 is an axial view of an end plate 650 according to modification 6.
Similar to the embodiment described above, a groove 655 is provided on the first side surface 651 of the end plate 650 of this modification. The groove portion 655 of this modification includes a first flow path portion 681, a second flow path portion 682, a third flow path portion 683, a fifth flow path portion 685, a first branch portion 688, a second branch portion 689, and a It has an end 656, a second end 657, a third end 658, and a fourth end 659. The groove portion 655 is connected to the through hole 31a of the shaft 31 at a first end portion 656. Oil O flows into the groove 655 from the first end 656 . Further, the groove portion 655 scatters the internal oil O radially outward at the second end 657, the third end 658, and the fourth end 659.

The first branch 688 is located radially outward from the first end 656, radially inward from the second end 657, radially inward from the third end 658, and radially inward from the fourth end 659. . The first flow path portion 681, the second flow path portion 682, and the third flow path portion 683 are connected to each other at the first branch portion 688. The first branch portion 688 is located at the upstream end of the first flow path portion 681, the upstream end of the third flow path portion 683, and the downstream end of the second flow path portion 682. The first branch portion 688 is located at the boundary between the first flow path portion 681 and the second flow path portion 682. Further, the first branch portion 688 is located at the boundary between the first flow path portion 681 and the third flow path portion 683. The oil O reaches the first branch part 688 from the second passage part 682, branches at the first branch part 688, and flows into the first passage part 681 and the third passage part 683, respectively. The first flow path portion 681, the second flow path portion 682, and the third flow path portion 683 each extend linearly when viewed from the axial direction.

The second branch part 689 is located radially outward from the first branch part 688, radially inward from the third end part 658, and radially inward from the fourth end part 659. The fifth flow path portion 685 branches from the fifth flow path portion 685 at a second branch portion 689 . The second branch portion 689 is located in the middle of the third flow path portion 683.

The second flow path section 682 is connected to the first flow path section 681 and the third flow path section 683 on the upstream side of the first flow path section 681 and the third flow path section 683. The second flow path portion 682 extends in the radial direction when viewed from the axial direction. The second flow path portion 682 is provided with a first end portion 656 and is connected to the through hole 31a of the shaft 31. The second flow path portion 682 guides the oil O flowing from the through hole 31a to the outside in the radial direction.

The first flow path portion 681 is connected to the second flow path portion 682 at a first branch portion 688. The first flow path portion 681 extends in a direction inclined with respect to the radial direction. In this modification, the first flow path section 681 and the second flow path section 682 are orthogonal to each other when viewed from the axial direction. The second end portion 657 is located in the first flow path portion 681. The second end portion 657 is arranged radially outward from the first branch portion 688.

The third flow path portion 683 is connected to the second flow path portion 682 at a first branch portion 688. The third flow path portion 683 branches from the first branch portion 688 . The third flow path portion 683 extends in the radial direction when viewed from the axial direction. In this modification, the third flow path portion 683 and the second flow path portion 682 continuously extend in the same straight line when viewed from the axial direction. The third end portion 658 is located in the third flow path portion 683. The third end portion 658 is disposed radially outward from the first branch portion 688.

The fifth flow path portion 685 is connected to the third flow path portion 683 at a second branch portion 689. The fifth flow path portion 685 branches from the second branch portion 689 . The fifth flow path portion 685 extends in a direction inclined with respect to the radial direction. The fourth end portion 659 is located in the fifth flow path portion 685. The fourth end portion 659 is arranged radially outward from the second branch portion 689.

According to this modification, the first branch part 688 and the second branch part 689 are provided in the groove part 655, and the oil O branched at the first branch part 688 and the second branch part 689 is transferred to the second end 657. , the third end 658 , and the fourth end 659 . Therefore, the opening directions of the second end 657, the third end 658, and the fourth end 659 can be set in different directions in the circumferential direction, and no matter which direction the rotor 30 rotates, Oil O can be dispersed appropriately.

(Modification 7)
FIG. 14 is an axial view of an end plate 750 of Modification Example 7.
Similar to the embodiment described above, four grooves 755 are provided on the first side surface 751 of the end plate 750 of this modification. Each of the grooves 755 of this modification has a configuration similar to that of the above-described embodiment, but the relationship between grooves 755 adjacent to each other in the circumferential direction is mainly different.

Each groove portion 755 has a first flow path portion 781, a second flow path portion 782, a boundary portion 789, a first end portion 756, and a second end portion 757. The groove portion 755 is connected to the through hole 31a of the shaft 31 at a first end portion 756. Oil O flows into the groove portion 755 from the first end portion 756 . Furthermore, the groove portion 755 scatters the internal oil O outward in the radial direction at the second end portion 757 . Boundary portion 789 is located radially outward from first end 756 and radially inward from second end 757 . The first flow path portion 781 and the second flow path portion 782 are connected to each other at a boundary portion 789. The first flow path portion 781 and the second flow path portion 782 each extend linearly when viewed from the axial direction. The second flow path portion 782 extends in the radial direction when viewed from the axial direction. The second flow path portion 782 is provided with a first end portion 756 and is connected to the through hole 31a of the shaft 31. The second flow path portion 782 guides the oil O flowing from the through hole 31a to the outside in the radial direction. The first flow path portion 781 is connected to the second flow path portion 782 at a boundary portion 789. The first flow path portion 781 extends in a direction inclined with respect to the radial direction. In this modification, the first flow path portion 781 and the second flow path portion 782 are orthogonal to each other when viewed from the axial direction. The second end portion 757 is located in the first flow path portion 781 . The second end portion 757 is arranged radially outward from the boundary portion 789.

In this modification, the plurality of grooves 755 include a first groove 755A and a second groove 755B. In this modification, the first side surface 751 is provided with two first grooves 755A and two second grooves 755B. The first groove portions 755A and the second groove portions 755B are arranged alternately in the circumferential direction.

As shown in FIG. 14, a reference line L passing through the central axis when viewed from the axial direction is assumed. The reference line L is located between the first groove portion 755A and the second groove portion 755B that are adjacent to each other in the circumferential direction. The first groove portion 755A and the second groove portion 755B are arranged symmetrically with respect to the reference line L. That is, in this modification, a plurality of grooves 755 are provided in the first side surface 751, and two of the plurality of grooves 755 are lined with respect to the reference line L passing through the central axis J when viewed from the axial direction. arranged symmetrically.

In the first groove portion 755A, the first flow path portion 781 extends rearward in the steady rotation direction +θ with respect to the boundary portion 789. On the other hand, in the second groove portion 755B, the first flow path portion 781 extends forward in the steady rotation direction +θ with respect to the boundary portion 789. According to this modification, the opening directions of the second end portions 757 of the first groove portion 755A and the second groove portion 755B can be set in different directions in the circumferential direction, so that when the rotor 30 rotates in either direction, Even if there is, the oil O can be appropriately scattered. Furthermore, even if the end plates 750 disposed on the left and right sides of the rotor core 32 are of the same shape, the amount of oil O scattered from the left and right end plates 750 of the rotor core 32 can be made approximately the same. .

(Modification 8)
FIG. 15 is an axial view of an end plate 850 of Modified Example 8.
Similar to the embodiment described above, four grooves 855 are provided on the first side surface 851 of the end plate 850 of this modification. Each groove 855 of this modification has substantially the same configuration as the groove 855 of Modification 1 described above.

Each groove portion 855 has a first flow path portion 881, a second flow path portion 882, a third flow path portion 883, a first branch portion 889, a first end portion 856, a second end portion 857, and a third end portion 858. and has. The groove portion 855 is connected to the through hole 31a of the shaft 31 at a first end portion 856. Oil O flows into the groove 855 from the first end 856 . Further, the groove portion 855 scatters the internal oil O outward in the radial direction at the second end portion 857 and the third end portion 858.

The first branch portion 889 is located radially outside the first end 856, radially inside the second end 857, and radially inside the third end 858. Located in The first flow path portion 881 , the second flow path portion 882 , and the third flow path portion 883 are connected to each other at the first branch portion 889 . The first branch portion 889 is located at the upstream end of the first flow path portion 881, the upstream end of the third flow path portion 883, and the downstream end of the second flow path portion 882. The first branch portion 889 is located at the boundary between the first flow path portion 881 and the second flow path portion 882. Further, the first branch portion 889 is located at the boundary between the first flow path portion 881 and the third flow path portion 883. The oil O reaches the first branch part 889 from the second passage part 882, branches at the first branch part 889, and flows into the first passage part 881 and the third passage part 883, respectively. The first flow path portion 881, the second flow path portion 882, and the third flow path portion 883 each extend linearly when viewed from the axial direction.

The second flow path section 882 is connected to the first flow path section 881 and the third flow path section 883 on the upstream side of the first flow path section 881 and the third flow path section 883. The second flow path portion 882 extends in the radial direction when viewed from the axial direction. The second flow path portion 882 is provided with a first end portion 856 and is connected to the through hole 31a of the shaft 31. The second flow path portion 882 guides the oil O flowing from the through hole 31a to the outside in the radial direction. The first flow path portion 881 is connected to the second flow path portion 882 at a first branch portion 889 . The first flow path portion 881 extends in a direction inclined with respect to the radial direction. In this modification, the first flow path section 881 and the second flow path section 882 are orthogonal to each other when viewed from the axial direction. The second end portion 857 is located in the first flow path portion 881 . The second end portion 857 is arranged radially outward from the first branch portion 889. The third flow path portion 883 is connected to the second flow path portion 882 at a first branch portion 889 . The third flow path portion 883 branches from the first branch portion 889 . The third flow path portion 883 extends in the radial direction when viewed from the axial direction. In this modification, the third flow path portion 883 and the second flow path portion 882 continuously extend in the same straight line when viewed from the axial direction. The third end portion 858 is located in the third flow path portion 883. The third end portion 858 is disposed radially outward from the first branch portion 889.

In this modification, the plurality of grooves 855 include a first groove 855A and a second groove 855B. The first groove portion 855A and the second groove portion 855B are arranged symmetrically with respect to a reference line L passing through the central axis J when viewed from the axial direction. Therefore, the groove portion 855 of this modification can obtain the same effect as Modification 7.

In this modification, the first flow path portions 881 of the first groove portion 855A and the second groove portion 855B that are adjacent to each other in the circumferential direction may be connected to each other via a connecting flow path portion 887. The connecting flow path portion 887, the first flow path portion 881 of the first groove portion 855A, and the first flow path portion 881 of the second groove portion 855B are arranged in the same straight line when viewed from the axial direction. By providing the connection flow path section 887, the oil O can move between the first groove section 855A and the second groove section 855B via the connection flow path section 887. Oil O can be stably scattered from the second end 857 and third end 858 of the first groove 855A and the second groove 855B.

(Modification 9)
FIG. 16 is an axial view of an end plate 950 of Modification 9. FIG.
Similar to the embodiment described above, four grooves 955 are provided on the first side surface 951 of the end plate 950 of this modification.

Each groove portion 955 includes a first flow path portion 981, a second flow path portion 982, a third flow path portion 983, a first branch portion 989, a first end portion 956, a second end portion 957, and a third end portion 958. and has. The groove portion 955 is connected to the through hole 31a of the shaft 31 at a first end portion 956. Oil O flows into the groove portion 955 from the first end portion 956 . Further, the groove portion 955 scatters the internal oil O outward in the radial direction at the second end portion 957 and the third end portion 958.

The first branch portion 989 is located radially outside the first end 956, radially inside the second end 957, and radially inside the third end 958. The first flow path portion 981 , the second flow path portion 982 , and the third flow path portion 983 are connected to each other at the first branch portion 989 . The first branch portion 989 is located at the upstream end of the first flow path portion 981, the upstream end of the third flow path portion 983, and the downstream end of the second flow path portion 982. The first branch portion 989 is located at the boundary between the first flow path portion 981 and the second flow path portion 982. Further, the first branch portion 989 is located at the boundary between the first flow path portion 981 and the third flow path portion 983. The oil O reaches the first branch section 989 from the second flow path section 982, branches at the first branch section 989, and flows into the first flow path section 981 and the third flow path section 983, respectively. The first flow path portion 981, the second flow path portion 982, and the third flow path portion 983 each extend linearly when viewed from the axial direction.

The second flow path section 982 is connected to the first flow path section 981 and the third flow path section 983 on the upstream side of the first flow path section 981 and the third flow path section 983. The second flow path portion 982 extends in a direction inclined with respect to the radial direction when viewed from the axial direction. The first end portion 956 is located in the second flow path portion 982 . The second flow path portion 982 is provided with a first end portion 956 and is connected to the through hole 31a of the shaft 31. The second flow path portion 982 guides the oil O flowing from the through hole 31a to the outside in the radial direction.

The first flow path portion 981 is connected to the second flow path portion 982 at a first branch portion 989. The first flow path portion 981 extends in a direction inclined with respect to the radial direction when viewed from the axial direction. The second end portion 957 is located in the first flow path portion 981 . The second end portion 957 is disposed radially outward from the first branch portion 989.

The third flow path portion 983 is connected to the second flow path portion 982 at a first branch portion 989. The third flow path portion 983 branches from the first branch portion 989 . The third flow path portion 983 extends in a direction inclined with respect to the radial direction when viewed from the axial direction. The third flow path section 983 extends in the same direction as the second flow path section 982. In this modification, the third flow path portion 983 and the second flow path portion 982 continuously extend in the same straight line when viewed from the axial direction. The third end portion 958 is located in the third flow path portion 983. The third end portion 958 is disposed radially outward from the first branch portion 989.

According to this modification, the direction in which the first flow path section 981 extends, and the direction in which the second flow path section 982 and the third flow path section 983 extend are both directions inclined with respect to the radial direction. The difference is in which direction it leans. In one groove portion 955 of this modification, the first flow path portion 981 is inclined to one side in the circumferential direction as it goes radially outward, and the second flow path portion 982 and the third flow path portion 983 are inclined in the radial direction. As it goes outward, it is inclined toward the other side in the circumferential direction. Therefore, the opening directions of the second end portion 957 and the third end portion 958 can be set in different directions in the circumferential direction, and the oil O can be appropriately scattered no matter which direction the rotor 30 rotates. can be done.

In this modification, the plurality of grooves 955 include a first groove 955A and a second groove 955B. The first groove portion 955A and the second groove portion 955B are arranged symmetrically with respect to a reference line L passing through the central axis J when viewed from the axial direction. Therefore, the groove portion 955 of this modification can obtain the same effect as Modification 7.

Further, in this modification, two circumferentially adjacent grooves 955 (first groove 955A and second groove 955B) are connected to each other at the downstream end 982a of each second flow path 982. . Thereby, the oil O can move between the first groove portion 955A and the second groove portion 955B. Oil O can be stably scattered from the second end 957 and third end 958 of the first groove 955A and the second groove 955B.

(Modification 10)
FIG. 17 is an axial view of the end plate 1050 of Modified Example 10.
Similar to the embodiment described above, four grooves 1055 are provided on the first side surface 1051 of the end plate 1050 of this modification. Each groove portion 1055 of this modification has a configuration similar to that of modification 9 described above. The groove portion 1055 of the end plate 1050 of this modification is different from that of the above-mentioned modification 9 in the direction in which the flow path portion is inclined in the circumferential direction. Moreover, the end plate 1050 of this modification differs from the above-described modification 9 in that the two grooves (first groove 1055A and second groove 1055B) intersect with each other.

Each groove portion 1055 includes a first flow path portion 1081, a second flow path portion 1082, a third flow path portion 1083, a first branch portion 1089, a first end portion 1056, a second end portion 1057, and a third end portion 1058. and has.

The first branch portion 1089 includes a first flow path portion 1081, a second flow path portion 1082, and a third flow path portion 1083 located radially outward from the first end portion 1056 and radially inside from the second end portion 1057. extend linearly when viewed from the axial direction.

The second flow path section 1082 is connected to the first flow path section 1081 and the third flow path section 1083 on the upstream side of the first flow path section 1081 and the third flow path section 1083. The second flow path portion 1082 extends in a direction inclined with respect to the radial direction when viewed from the axial direction. The first end 1056 is located in the second flow path section 1082. The second flow path portion 1082 is provided with a first end portion 1056 and is connected to the through hole 31a of the shaft 31. The second flow path portion 1082 guides the oil O flowing in from the through hole 31a to the outside in the radial direction.

The first flow path portion 1081 is connected to the second flow path portion 1082 at a first branch portion 1089. The first flow path portion 1081 extends in a direction inclined with respect to the radial direction when viewed from the axial direction. The second end portion 1057 is located in the first flow path portion 1081. The second end portion 1057 is arranged radially outward than the first branch portion 1089.

The third flow path portion 1083 is connected to the second flow path portion 1082 at a first branch portion 1089. The third flow path section 1083 branches from the first branch section 1089. The third flow path portion 1083 extends in a direction inclined with respect to the radial direction when viewed from the axial direction. In this modification, the third flow path section 1083 and the second flow path section 1082 continuously extend in the same straight line when viewed from the axial direction. The third end portion 1058 is located in the third flow path portion 1083. The third end portion 1058 is arranged radially outward from the first branch portion 1089.

According to this modification, the direction in which the first flow path section 1081 extends, and the direction in which the second flow path section 1082 and the third flow path section 1083 extend are both inclined toward one side in the circumferential direction with respect to the radial direction. It is the direction. That is, in one groove portion 1055 of this modification, the first flow path portion 1081 is inclined toward one side in the circumferential direction as it goes radially outward, and the second flow path portion 1082 and the third flow path portion 1083 are As it goes radially outward, it is inclined toward one side in the circumferential direction. Therefore, the oil O can be scattered over a wide range in the circumferential direction from the end plate 1050 by setting the opening directions of the second end 1057 and the third end 1058 in the same direction in the circumferential direction.

In this modification, the plurality of grooves 1055 include a first groove 1055A and a second groove 1055B. The first groove portion 1055A and the second groove portion 1055B are arranged symmetrically with respect to a reference line L passing through the central axis J when viewed from the axial direction. Therefore, the groove portion 1055 of this modification can obtain the same effect as Modification 7.

In this modification, two grooves 1055 (first groove 1055A and second groove 1055B) arranged line-symmetrically with respect to the reference line L intersect with each other at an intersection 1087 on the reference line L. Thereby, the oil O can move between the first groove portion 1055A and the second groove portion 1055B. Therefore, the oil O can be stably scattered from the second end 1057 and third end 1058 of the first groove 1055A and the second groove 1055B.

The present invention is not limited to the above-described embodiments, and other configurations and other methods may be adopted within the scope of the technical idea of the present invention. The first surface and the second surface of the groove bottom surface of the groove portion may be any surface as long as it is a surface that slopes toward one side in the axial direction as it goes radially outward. The first surface and the second surface may be curved surfaces. Further, the first surface may be provided anywhere on the groove bottom surface. The angle of inclination of the first surface with respect to the plane orthogonal to the axial direction is not particularly limited.

The groove bottom surface of the first groove portion does not need to have a third surface that connects the first surface and the second surface. In this case, the first surface and the second surface may be directly connected. The radially inner end of the groove bottom surface of the first groove portion may be in contact with the outer circumferential surface of the shaft. The number of first grooves is not particularly limited as long as it is one or more.

The protrusion that protrudes radially outward with respect to the outer peripheral surface of the shaft may be part of the same single member as the shaft, or may be separate from the shaft. The shape of the protrusion is not particularly limited. When the protrusion is separate from the shaft, the protrusion may be a member other than the nut, such as a washer. The end plate does not need to be provided with a wall portion that projects away from the rotor core in the axial direction.

The rotating electric machine to which the present invention is applied is not limited to a motor, but may be a generator. The use of the rotating electric machine is not particularly limited. For example, the rotating electrical machine may be mounted on a vehicle for purposes other than rotating an axle, or may be mounted on equipment other than the vehicle. The posture in which the rotating electric machine is used is not particularly limited. The central axis of the rotating electric machine may extend in the vertical direction. The refrigerant may be supplied into the cavity of the shaft in the rotating electrical machine in any manner. The shaft may have any configuration as long as it has a cavity. The refrigerant may be other than oil.

Note that the present technology can have the following configuration.
(1) A rotor arranged inside an annular stator and rotatable about a central axis, including a shaft extending along the central axis, a rotor core fixed to the shaft, and an insert into which the shaft is inserted. an annular end plate provided with a hole and arranged axially side by side with the rotor core; the shaft has a cavity provided inside the shaft; and an annular end plate extending radially outward from the cavity. a through hole that opens on the outer peripheral surface of the shaft, the end plate has a first side surface facing one side in the axial direction, and the first side surface has a first side surface that is connected to the opening of the through hole. and a second end located radially outward from the first end; the groove has a first flow path extending in a direction inclined with respect to the radial direction; The second end portion is a rotor located in the first flow path portion.
(2) The inner surface of the groove portion has a groove bottom surface facing one side in the axial direction, the groove bottom surface has a first surface facing the opening of the through hole in the radial direction, and the first surface includes: The rotor according to (1), which is inclined toward one side in the axial direction as it goes radially outward.
(3) The groove portion has a second flow path portion extending in the radial direction, the first end portion is located in the second flow path portion, and the first surface is located in the second flow path portion. The rotor according to (2), which is provided. (4) The groove bottom surface has a second surface located at the second end, and the second surface is inclined toward one side in the axial direction as it goes radially outward. The rotor described in 3). (5) In the cross section along the axial direction, an imaginary line extending radially outward in the direction along the second surface from the radially outer end of the second surface passes through the coil end of the stator; 4).
(6) The groove bottom surface has a third surface connecting the first surface and the second surface, and the third surface is a flat surface along a plane perpendicular to the axial direction. ) or the rotor described in (5).
(7) The first side surface is provided with a plurality of first recesses, and the first recesses are arranged at equal intervals in the circumferential direction, according to any one of (1) to (6). Rotor.
(8) As described in (7), the first recess has a groove shape extending along the circumferential direction, and the dimension of the first recess along the radial direction gradually decreases toward one side in the circumferential direction. rotor.
(9) The outer circumferential surface of the shaft is circular when viewed from the axial direction, and the insertion hole is circular when viewed from the axial direction, and either the outer circumferential surface of the shaft or the inner edge of the insertion hole One side is provided with a plurality of projections protruding to the other side, the other side is provided with a plurality of accommodation recesses into which the projections are inserted, the shaft has a plurality of through holes, and the shaft has a plurality of through holes, The rotor according to any one of (1) to (8), wherein the rotor is arranged between the through holes in the circumferential direction.
(10) A protrusion protruding radially outward with respect to the outer circumferential surface of the shaft, the protrusion sandwiching the end plate between the rotor core in the axial direction, and the first side having a protrusion in the axial direction. The rotor according to any one of (1) to (9), wherein the rotor is circular when viewed from above and is provided with a second recess that contacts the protrusion at the bottom surface.
(11) The rotor according to (10), wherein the first end overlaps the protrusion and the second end is located radially outward than the protrusion when viewed from the axial direction.
(12) The end plate has a second side surface facing the rotor core side, and the second side surface includes a third recess surrounding the insertion hole and a third recess located radially outward of the third recess in the circumferential direction. The rotor according to any one of (1) to (11), wherein the rotor is provided with a concave groove extending along the rotor.
(13) According to any one of (1) to (12), the groove portion has a second flow path portion extending in the radial direction, and the first end portion is located in the second flow path portion. Rotor listed.
(14) The rotor according to (13), wherein the first flow path portion and the second flow path portion each extend linearly when viewed from the axial direction.
(15) The groove portion includes a first branch portion located radially outward from the first end portion and radially inward from the second end portion, and a third flow path portion branched from the first branch portion. The rotor according to any one of (1) to (14), further comprising: a third end portion located in the third flow path portion and disposed radially outward than the first branch portion.
(16) The groove portion has a second flow path portion extending in the radial direction, the first end portion is located in the second flow path portion, and the first branch portion is located in the second flow path portion. and the second flow path section.
(17) The rotor according to (15), wherein the first branch part is located in the middle of the first flow path part.
(18) The groove portion has a second flow path portion extending in a direction inclined with respect to the radial direction, the first end portion is located in the second flow path portion, and the third flow path portion is located in the second flow path portion. The rotor according to (15), which is connected to the second flow path portion at the first branch portion and extends in the same direction as the second flow path portion.
(19) The first flow path section is inclined toward one side in the circumferential direction as it goes radially outward, and the second flow path section and the third flow path section are inclined toward the other side in the circumferential direction as they go outward in the radial direction. The rotor according to (18), which is inclined at .
(20) The first flow path section is inclined toward one side in the circumferential direction as it goes radially outward, and the second flow path section and the third flow path section are inclined toward one side in the circumferential direction as they go outward in the radial direction. The rotor according to (18), which is inclined at .
(21) The third flow path portion extends in a direction inclined with respect to the radial direction, and the second end portion and the third end portion are arranged on the opposite side in the circumferential direction with respect to the first branch portion. , (15).
(22) The third flow path portion extends in a direction inclined with respect to the radial direction, and the second end portion and the third end portion are arranged on the same side in the circumferential direction with respect to the first branch portion. , (15).
(23) The groove portion includes a second branch portion located radially outward from the first branch portion and radially inward from the third end portion, and a fifth flow path portion branched from the second branch portion. , a fourth end portion located in the fifth flow path portion and disposed radially outward than the second branch portion.
(24) The groove portion has a second flow path portion and a fourth flow path portion, the first end portion is located in the second flow path portion, and the fourth flow path portion is located in the second flow path portion. The rotor according to any one of (1) to (23), which connects the second flow path portion and the first flow path portion.
(25) The rotor according to any one of (1) to (24), wherein the first side surface is provided with a plurality of the grooves, and the plurality of grooves are arranged at equal intervals in the circumferential direction. .
(26) A plurality of the grooves are provided on the first side surface, and two of the plurality of grooves are arranged symmetrically with respect to a reference line passing through the central axis when viewed from the axial direction. , (1) to (25).
(27) The rotor according to (26), wherein the two grooves arranged symmetrically with respect to the reference line intersect with each other on the reference line.
(28) A rotating electrical machine comprising the rotor according to any one of (1) to (27) and the stator.
(29) A drive device comprising the rotating electrical machine according to (28) and a gear mechanism connected to the rotating electrical machine.

The configurations described above in this specification can be combined as appropriate within a mutually consistent range.

DESCRIPTION OF SYMBOLS 10... Rotating electric machine, 30... Rotor, 31... Shaft, 31a... Through hole, 31c... Outer opening (opening), 31k... Housing recess, 32... Rotor core, 37... Gap part, 40... Stator, 42a, 42b... Coil end , 42c... Coil, 50, 50a, 50b, 150, 250, 350, 450, 550, 650, 750, 850, 950, 1050... End plate, 50h... Insertion hole, 50k... Projection, 51, 151, 251, 351, 451, 551, 651, 751, 851, 951, 1051...first side surface, 52...second side surface, 53...first recessed portion, 54...second recessed portion, 54a...bottom surface, 55,155,255,355, 455,555,655,755,855,955,1055...Groove portion, 55a...First surface, 55b...Second surface, 55c...Third surface, 55d...Groove bottom surface, 56,156,256,356,456,556 , 656, 756, 856, 956, 1056... first end, 57, 157, 257, 357, 457, 557, 657, 757, 857, 957, 1057... second end, 58... third recess, 59 ...Concave groove part, 81,181,281,381,481,581,681,781,881,981,1081...First flow path part, 82,182,282,382,482,582,682,782,882, 982,1082...Second flow path section, 89,288,789...Boundary section, 183,283,383,483,683,883,983,1083...Third flow path section, 100...Drive device, 158,258, 358, 458, 658, 858, 958, 1058...Third end part, 189, 289, 389, 489, 688, 889, 989, 1089... First branch part, 584... Fourth flow path part, 659... Fourth End portion, 685...Fifth channel portion, 689...Second branch portion, IL...Virtual line, J...Center axis line, L...Reference line

Claims

A rotor arranged inside an annular stator and rotatable about a central axis,
a shaft extending along the central axis;
a rotor core fixed to the shaft;
an annular end plate provided with an insertion hole into which the shaft is inserted and arranged in line with the rotor core in the axial direction;
The shaft includes:
a cavity provided inside the shaft;
a through hole extending radially outward from the cavity and opening at the outer circumferential surface of the shaft;
The end plate has a first side surface facing one side in the axial direction,
The first side surface is provided with a groove portion having a first end portion connected to the opening of the through hole, and a second end portion located radially outward from the first end portion;
The groove portion has a first flow path portion extending in a direction inclined with respect to the radial direction,
The second end portion is a rotor located in the first flow path portion.
The inner surface of the groove portion has a groove bottom surface facing one side in the axial direction,
The groove bottom surface has a first surface facing the opening of the through hole in the radial direction,
The rotor according to claim 1, wherein the first surface is inclined toward one side in the axial direction as it goes radially outward.
The groove portion has a second flow path portion extending in the radial direction,
The first end portion is located in the second flow path portion,
The rotor according to claim 2, wherein the first surface is provided in the second flow path section.
The groove bottom surface has a second surface located at the second end,
The rotor according to claim 2, wherein the second surface is inclined toward one side in the axial direction as it goes radially outward.
In a cross section along the axial direction, an imaginary line extending radially outward in a direction along the second surface from a radially outer end of the second surface passes through a coil end of the stator. Rotor listed.
The groove bottom surface has a third surface connecting the first surface and the second surface,
The rotor according to claim 4, wherein the third surface is a flat surface along a plane perpendicular to the axial direction.
The first side surface is provided with a plurality of first recesses,
The rotor according to claim 1, wherein the first recesses are arranged at equal intervals in the circumferential direction.
The first recess has a groove shape extending along the circumferential direction,
The dimension along the radial direction of the first recess gradually decreases toward one side in the circumferential direction,
A rotor according to claim 7.
The outer circumferential surface of the shaft is circular when viewed from the axial direction,
The insertion hole is circular when viewed from the axial direction,
Either the outer peripheral surface of the shaft or the inner edge of the insertion hole is provided with a plurality of protrusions that protrude toward the other side, and the other is provided with a plurality of accommodation recesses into which the protrusions are inserted. ,
The shaft has a plurality of the through holes,
The rotor according to claim 1, wherein the accommodation recess is arranged between the through holes in the circumferential direction.
comprising a protrusion that protrudes radially outward with respect to the outer circumferential surface of the shaft,
The protruding portion sandwiches the end plate between the protruding portion and the rotor core in the axial direction,
The rotor according to claim 1, wherein the first side surface is provided with a second recess that is circular when viewed from the axial direction and contacts the protrusion at a bottom surface.
The rotor according to claim 10, wherein the first end overlaps the protrusion and the second end is located radially outward than the protrusion when viewed from the axial direction.
The end plate has a second side surface facing the rotor core side,
The second side includes
a third recess surrounding the insertion hole;
The rotor according to claim 1, further comprising: a groove portion located on the radially outer side of the third recess portion and extending along the circumferential direction.
The groove portion has a second flow path portion extending in the radial direction,
The rotor according to claim 1, wherein the first end is located in the second flow path.
The rotor according to claim 13, wherein the first flow path portion and the second flow path portion each extend linearly when viewed from the axial direction.
The groove portion is
a first branch portion located radially outward from the first end and radially inward from the second end;
a third flow path section branching from the first branch section;
The rotor according to claim 1, further comprising a third end portion located in the third flow path portion and disposed radially outward than the first branch portion.
The groove portion has a second flow path portion extending in the radial direction,
The first end portion is located in the second flow path portion,
The rotor according to claim 15, wherein the first branch section is located at a boundary between the first flow path section and the second flow path section.
The rotor according to claim 15, wherein the first branch part is located in the middle of the first flow path part.
The groove portion has a second flow path portion extending in a direction inclined with respect to the radial direction,
The first end portion is located in the second flow path portion,
The rotor according to claim 15, wherein the third flow path portion is connected to the second flow path portion at the first branch portion and extends in the same direction as the second flow path portion.
The first flow path section is inclined toward one side in the circumferential direction as it goes radially outward,
The rotor according to claim 18, wherein the second flow path portion and the third flow path portion are inclined toward the other side in the circumferential direction as they go radially outward.
The first flow path section is inclined toward one side in the circumferential direction as it goes radially outward,
The rotor according to claim 18, wherein the second flow path portion and the third flow path portion are inclined toward one side in the circumferential direction as they go radially outward.
The third flow path section extends in a direction inclined with respect to the radial direction,
The second end portion and the third end portion are arranged on opposite sides in the circumferential direction with respect to the first branch portion,
A rotor according to claim 15.
The third flow path section extends in a direction inclined with respect to the radial direction,
The second end and the third end are arranged on the same side in the circumferential direction with respect to the first branch,
A rotor according to claim 15.
The groove portion is
a second branch part located radially outward from the first branch part and radially inward from the third end part;
a fifth flow path section branching from the second branch section;
The rotor according to claim 15, further comprising a fourth end portion located in the fifth flow path portion and disposed radially outward than the second branch portion.
The groove portion has a second flow path portion and a fourth flow path portion,
The first end portion is located in the second flow path portion,
The rotor according to claim 1, wherein the fourth flow path section connects the second flow path section and the first flow path section.
A plurality of the grooves are provided on the first side surface,
The rotor according to claim 1, wherein the plurality of grooves are arranged at equal intervals in the circumferential direction.
A plurality of the grooves are provided on the first side surface,
The rotor according to claim 1, wherein two of the plurality of grooves are arranged symmetrically with respect to a reference line passing through the central axis when viewed from the axial direction.
the two grooves arranged symmetrically with respect to the reference line intersect with each other on the reference line;
A rotor according to claim 26.
A rotor according to any one of claims 1 to 27,
A rotating electrical machine comprising the stator.
A rotating electrical machine according to claim 28;
A drive device comprising: a gear mechanism connected to the rotating electric machine.