CN218569951U - Rotor, rotating electric machine, and pump - Google Patents

Abstract

The utility model provides a rotor, rotating electrical machines and pump. The rotor is rotatable about a central axis, and includes: a rotor core; a first shaft fixed to the rotor core and protruding to one axial side of the rotor core; and a second shaft fixed to the rotor core and protruding to the other side in the axial direction than the rotor core. The rotor core has a central hole that penetrates the rotor core in the axial direction. The other axial end of the first shaft is inserted into the central hole. The axial end of the second shaft is inserted into the central hole. The first shaft and the second shaft are provided separately in the axial direction.

Description

Rotor, rotating electric machine, and pump

Technical Field

The utility model relates to a rotor, rotating electrical machines and pump.

Background

Electric motors and pumps are known which have a rotor with a rotor core and a shaft. For example, patent document 1 describes a fastening structure of a rotor core and a shaft of a motor.

Patent document 1: japanese patent No. 4602784

In the above-described fastening structure of the rotor core and the shaft of the motor, since 1 motor shaft is press-fitted into the rotor core and assembled, if the axial dimension of the rotor core differs depending on the model of the motor, it is necessary to use shafts having different axial dimensions. Therefore, it is necessary to prepare different shafts for each model of the motor having different axial dimensions of the rotor core, which leads to a problem of increased manufacturing cost of the motor.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is an object of the present invention to provide a rotor having a shaft that can be used even for another rotor core having a different axial dimension, a rotating electric machine, and a pump.

The utility model discloses a first mode provides a rotor, and it can use the central axis to rotate as the center, and its characterized in that, this rotor has: a rotor core; a first shaft fixed to the rotor core and protruding to one axial side of the rotor core; and a second shaft fixed to the rotor core and protruding to the other side in the axial direction than the rotor core, wherein the rotor core has a central hole penetrating the rotor core in the axial direction, the other end in the axial direction of the first shaft is inserted into the central hole, the one end in the axial direction of the second shaft is inserted into the central hole, and the first shaft and the second shaft are provided separately in the axial direction.

A second aspect of the present invention is the rotor of the first aspect, wherein the rotor core is formed by stacking a plurality of plate members in the axial direction.

The utility model discloses a rotor of third mode characterized in that, in the rotor of first mode or second mode, the primary shaft with the secondary shaft is impressed respectively in the central hole and be fixed in rotor core.

A fourth aspect of the present invention is the rotor of the third aspect, wherein at least one of the first shaft and the second shaft has a plurality of protrusions and a plurality of recesses on an outer peripheral surface of a portion pressed into the central hole.

A fifth aspect of the present invention is the rotor of the third aspect, wherein at least one of an inner peripheral surface of the portion of the rotor core in the central hole into which the first shaft is pressed and an inner peripheral surface of the portion of the rotor core in which the second shaft is pressed has a plurality of convex portions and a plurality of concave portions.

A sixth aspect of the present invention is the rotor of the first or second aspect, wherein the first shaft has a first contact portion that contacts the surface of the rotor core facing the one side in the axial direction, and the second shaft has a second contact portion that contacts the surface of the rotor core facing the other side in the axial direction.

A seventh aspect of the present invention is the rotor of the sixth aspect, wherein the rotor includes a resin member fixed to the rotor core, the rotor core includes a plurality of through holes that pass through the rotor core in the axial direction, the plurality of through holes are provided at intervals in the circumferential direction, a radially outer end of the first contact portion and a radially outer end of the second contact portion are positioned more radially outward than the plurality of through holes, the first contact portion includes a plurality of first openings that pass through the first contact portion in the axial direction in portions opposed to the plurality of through holes, the second contact portion includes a plurality of second openings that pass through the second contact portion in the axial direction in portions opposed to the plurality of through holes, and the resin member includes: a first plate-like portion provided on a surface of the first contact portion facing one axial side; a second plate-like portion provided on a surface of the second contact portion facing the other side in the axial direction; and a plurality of coupling portions that axially couple the first plate-like portion and the second plate-like portion via the interiors of the through holes, the interiors of the first openings, and the interiors of the second openings.

The eighth aspect of the present invention provides a rotating electrical machine, which is characterized in that: a rotor according to any one of the first to seventh aspects; and a stator facing the rotor with a gap therebetween.

The ninth aspect of the present invention provides a pump, which is characterized in that: the rotating electric machine according to the eighth aspect; and a pump mechanism coupled to the rotor.

According to the utility model discloses an one mode, in rotor, rotating electrical machines and pump, in the rotor core that axial size is different, can the shared use axle.

Drawings

Fig. 1 is a schematic diagram showing a pump of a first embodiment.

Fig. 2 is a perspective view showing a shaft and a rotor core of the first embodiment.

Fig. 3 is a sectional view showing a shaft and a rotor core of the first embodiment.

Fig. 4 is a sectional view showing a rotor core of the first embodiment.

Fig. 5 is an exploded perspective view showing a shaft and a rotor core of the first embodiment.

Fig. 6 is a sectional view showing a rotor core of a second embodiment.

Fig. 7 is an exploded perspective view showing a shaft and a rotor core of the second embodiment.

Fig. 8 is a perspective view showing a shaft and a rotor core of the third embodiment.

Fig. 9 is a sectional view showing a shaft and a rotor core of the third embodiment.

Fig. 10 is an exploded perspective view showing a shaft and a rotor core of the third embodiment.

Description of the reference symbols

10. 210, 310: a rotor; 12. 212: a rotor core; 12a: a plate member; 14. 214: a central bore; 15: a through hole; 20. 220, 320: a first shaft; 22. 322: a first contact portion; 25: a convex portion; 26: a recess; 30. 230, 330: a second shaft; 32. 332: a second contact portion; 35: a convex portion; 36: a recess; 50. 350: a resin member; 51. 351, the ratio of: a first plate-like portion; 52. 352: a second plate-like portion; 53. 353: a connecting portion; 60: a pump mechanism; 71: a stator; 80. 280: a rotating electric machine; 90. 290: a pump; 218: a convex portion; 219: a recess; 325: a first opening; 335: a second opening; j: a central axis.

Detailed Description

In the following description, the Z axis is shown in the drawings as appropriate. The Z axis represents a direction in which the center axis J of the rotor of the embodiment described below extends. The central axis J shown in each figure is an imaginary axis. In the following description, a direction in which the central axis J extends, that is, a direction parallel to the Z axis is referred to as an "axial direction". The radial direction centered on the central axis J is simply referred to as "radial direction". The circumferential direction centered on the central axis J is simply referred to as "circumferential direction". The side (+ Z side) of the Z axis in the axial direction toward which the arrow is directed is referred to as "axial side". The side opposite to the side on which the arrow of the Z axis in the axial direction faces (Z side) is referred to as "the other side in the axial direction".

The circumferential direction is indicated by an arrow θ in each drawing. The side toward which the arrow θ faces in the circumferential direction is referred to as "circumferential side". The side opposite to the side toward which the arrow θ faces in the circumferential direction is referred to as "the other side in the circumferential direction". The circumferential side is a side that advances clockwise around the central axis J when viewed from the axial side. The other side in the circumferential direction is a side advancing counterclockwise around the center axis J when viewed from the one side in the axial direction.

< first embodiment >

The pump 90 of the present embodiment shown in fig. 1 is an electric pump mounted on a device mounted on a vehicle. The device to which the pump 90 is attached may be an automatic transmission, or may be a drive device that drives an axle of a vehicle. The pump 90 is, for example, an electric oil pump that supplies oil to a device mounted on the vehicle.

The pump 90 has a rotating electric machine 80 and a pump mechanism 60. In the present embodiment, the rotating electrical machine 80 is a motor. The rotating electric machine 80 includes a housing 40, a rotor 10, a stator 71, bearings 75 and 76, and an oil seal 77.

The housing 40 internally houses the rotor 10, the stator 71, the bearings 75 and 76, the oil seal 77, and the pump mechanism 60. The housing 40 has a main body cover 41 and a pump cover 42. The main body cover 41 and the pump cover 42 are different components from each other. The pump cover 42 is fixed to the other axial side of the body cover 41.

The main body cover 41 has a motor housing portion 41a and a pump housing portion 41b. In the present embodiment, the motor housing portion 41a and the pump housing portion 41b are part of a single member identical to each other. The motor housing 41a houses therein the rotor 10, the stator 71, the bearings 75 and 76, and the oil seal 77. In the present embodiment, the motor housing portion 41a is cylindrical and extends in the axial direction. The axial end of the motor housing 41a is the axial end of the body cover 41. The motor housing 41a has a hole 41c on the other axial end side, which is open on the other axial end side. The hole 41c has a circular shape centered on the central axis J. The other axial end of the hole 41c is connected to the inside of the pump housing 41b.

The rotor 10 is rotatable about a central axis J extending in the axial direction. The rotor 10 includes a first shaft 20, a second shaft 30, a rotor body 11, and a resin member 50. The first shaft 20 and the second shaft 30 are fixed to the rotor body 11. The rotor 10 is supported rotatably about the center axis J by a bearing 75 supporting the first shaft 20 and a bearing 76 supporting the second shaft 30.

The stator 71 faces the rotor 10 with a gap therebetween. The stator 71 is located radially outside the rotor 10. The stator 71 has a stator core 72, an insulator 73, and a plurality of coils 74. The stator 71 is fixed to an inner surface of the motor housing portion 41 a.

An oil seal 77 that seals between the inner peripheral surface of the hole portion 41c and the outer peripheral surface of the second shaft 30 is retained in the hole portion 41c. In the hole 41c, a bearing 76 is held on one axial side of the oil seal 77. The motor housing portion 41a includes a bearing holding portion 41e at a position on one axial side of the rotor 10 and the stator 71. The bearing 75 is held by the bearing holding portion 41e.

In the present embodiment, the bearings 75 and 76 are rolling bearings. The bearings 75, 76 are ball bearings. The bearing 75 rotatably supports a portion of the first shaft 20 on one axial side of the rotor body 11. The bearing 76 rotatably supports a portion of the second shaft 30 on the other axial side than the rotor body 11.

The pump housing portion 41b is connected to the other axial side of the motor housing portion 41 a. The pump housing 41b houses the pump mechanism 60 therein. The pump housing portion 41b is open on the other axial side. The other axial opening of the pump housing 41b is closed by a pump cover 42.

The pump mechanism 60 has an inner rotor 61 and an outer rotor 62. The inner rotor 61 is connected to a portion of the second shaft 30 protruding into the pump housing 41b. Thereby, the pump mechanism 60 is connected to the rotor 10. The inner rotor 61 is annular surrounding the second shaft 30. The outer rotor 62 is annular and surrounds the inner rotor 61. The inner rotor 61 intermeshes with the outer rotor 62. Therefore, by rotating the inner rotor 61 with the rotor 10, the outer rotor 62 also rotates.

As shown in fig. 3, the rotor body 11 includes a rotor core 12 and a plurality of magnets 13. The rotor core 12 is substantially cylindrical and extends in the axial direction around the central axis J. The rotor core 12 is formed by axially stacking a plurality of substantially annular plate members 12a centered on the central axis J. The plate member 12a is made of a magnetic material. The magnetic substance constituting the plate member 12a is not particularly limited. The plate member 12a of the present embodiment is an electromagnetic steel plate.

As shown in fig. 4, the rotor core 12 has a central hole 14, a plurality of through holes 15, a plurality of magnet receiving holes 16, and a plurality of outer core portions 17. The center hole 14 axially penetrates the rotor core 12. The center hole 14 is a circular hole centered on the center axis J. The through hole 15 penetrates the rotor core 12 in the axial direction. The through hole 15 is a circular hole. The through holes 15 are provided at equal intervals along the circumferential direction at positions radially outward of the center hole 14 and radially inward of the magnet accommodating hole 16. In the present embodiment, 8 through holes 15 are provided. In the present embodiment, the through holes 15 having a large inner diameter and the through holes 15 having a small inner diameter are alternately provided along the circumferential direction. The inner diameters of all the through holes 15 may be the same.

The magnet receiving hole 16 penetrates the rotor core 12 in the axial direction. The magnet receiving hole 16 is a rectangular hole. The 2 inner side surfaces of the magnet receiving hole 16 face in the radial direction. In the present embodiment, the dimension of the magnet accommodating hole 16 in the direction perpendicular to the radial direction is larger than the dimension in the radial direction. The magnet receiving holes 16 are provided at equal intervals in the circumferential direction at radially outer edges of the rotor core 12. In the present embodiment, 8 magnet receiving holes 16 are provided.

The outer core portions 17 are provided radially outward of the magnet receiving holes 16, respectively. The outer core portion 17 has an arc shape protruding radially outward as viewed in the axial direction. The outer core portions 17 are arranged at equal intervals along the circumferential direction at intervals. In the present embodiment, 8 outer core portions 17 are provided.

The magnets 13 are accommodated in the respective magnet accommodating holes 16. The magnet 13 has a plate shape extending in the axial direction. The magnet 13 has a rectangular shape when viewed in the axial direction. The axial end of the magnet 13 is disposed at the same position in the axial direction as the axial end of the rotor core 12. The other axial end of the magnet 13 is disposed at the same position in the axial direction as the other axial end of the rotor core 12. The magnet 13 is a permanent magnet.

As shown in fig. 2 and 3, the first shaft 20 has a cylindrical shape extending in the axial direction around the central axis J. First shaft 20 is fixed to rotor core 12. In the present embodiment, the first shaft 20 is fixed so that the other axial side portion is press-fitted into the central hole 14 of the rotor core 12. As shown in fig. 1, one axial side portion of the first shaft 20 protrudes to one axial side from the rotor core 12. A portion on one side in the axial direction of the first shaft 20 is supported by a bearing 75. As shown in fig. 3 and 5, the first shaft 20 has a first inserted portion 21, a first contact portion 22, and a main body portion 23. In the present embodiment, the first inserted portion 21, the first contact portion 22, and the main body portion 23 are part of the same single member.

The first inserted portion 21 has a cylindrical shape extending in the axial direction around the central axis J. The first inserted portion 21 is a portion on the other side in the axial direction of the first shaft 20. The other end in the axial direction of the first inserted portion 21 is the other end in the axial direction of the first shaft 20. The first inserted portion 21 is fixed so as to be press-fitted into a portion on one axial side of the center hole 14. That is, the other axial end of the first shaft 20 is inserted into the central hole 14. The first inserted portion 21 has a plurality of convex portions 25 and a plurality of concave portions 26 extending in the axial direction on the outer peripheral surface. The plurality of convex portions 25 and the plurality of concave portions 26 are alternately arranged along the circumferential direction. In the present embodiment, the plurality of convex portions 25 and the plurality of concave portions 26 are provided by knurling. That is, the first shaft 20 has a plurality of convex portions 25 and a plurality of concave portions 26 on the outer peripheral surface of the portion pressed into the center hole 14. Therefore, by the press-fitting, the stress received by the outer peripheral surface of the first inserted portion 21 from the inner peripheral surface of the central hole 14 is released and absorbed by the projection 25 deforming in the circumferential direction, and the pressure at the time of the press-fitting can be reduced.

The first contact portion 22 is located at one axial edge of the first inserted portion 21. The first contact portion 22 has a disc shape centered on the central axis J. The plate surface of the first contact portion 22 faces the axial direction. The first contact portion 22 protrudes radially outward from the outer peripheral surface of the first inserted portion 21. The outer diameter of the first contact portion 22 is larger than the outer diameter of the first inserted portion 21. The radially outer end of the first contact portion 22 is located radially inward of the through hole 15. The surface of the first contact portion 22 facing the other axial side contacts the surface of the rotor core 12 facing the one axial side. That is, the first shaft 20 has a first contact portion 22 that contacts a surface of the rotor core 12 facing one axial side.

The body portion 23 extends from one side in the axial direction of the first inserted portion 21 facing the one side in the axial direction. The body 23 has a cylindrical shape extending in the axial direction around the central axis J. The body portion 23 includes a first body portion 23a, a second body portion 23b, and a third body portion 23c. The first body portion 23a is continuous with one axial side of the first inserted portion 21. The outer diameter of the first body portion 23a is smaller than the outer diameter of the first contact portion 22.

The second body portion 23b is connected to one axial side of the first body portion 23a. The outer diameter of the second body portion 23b is larger than the outer diameter of the first body portion 23a and smaller than the outer diameter of the first contact portion 22. Although not shown, the outer peripheral surface of the second body portion 23b is supported by a bearing 75. Thereby, the bearing 75 rotatably supports the first shaft 20.

The third body portion 23c is connected to one axial side of the second body portion 23 b. The outer diameter of the third body portion 23c is smaller than the outer diameter of the first body portion 23a and the outer diameter of the second body portion 23 b. The axial one-side end portion of the third body portion 23c is an axial one-side end portion of the first shaft 20.

As shown in fig. 2 and 3, the second shaft 30 has a cylindrical shape extending in the axial direction about the central axis J. The second shaft 30 is fixed to the rotor core 12. In the present embodiment, the second shaft 30 is fixed so that one axial portion is press-fitted into the central hole 14 of the rotor core 12. As shown in fig. 1, the second shaft 30 axially protrudes from the inside of the motor housing portion 41a to the inside of the pump housing portion 41b through the hole portion 41c. A portion of the second shaft 30 on the other axial side is supported by a bearing 76. A portion of the second shaft 30 on the other axial side is in contact with the oil seal 77. The inner rotor 61 is coupled to the other axial side portion of the second shaft 30. As shown in fig. 3 and 5, the second shaft 30 has a second inserted portion 31, a second contact portion 32, and a main body portion 33. In the present embodiment, the second inserted portion 31, the second contact portion 32, and the body portion 33 are part of the same single member.

The second inserted portion 31 has a cylindrical shape extending in the axial direction around the central axis J. The second inserted portion 31 is a portion on one side in the axial direction of the second shaft 30. The axial one-side end of the second inserted portion 31 is the axial one-side end of the second shaft 30. The second inserted portion 31 is fixed to be press-fitted into the other axial side portion of the center hole 14. That is, the axial end of the second shaft 30 is inserted into the central hole 14. The second inserted portion 31 has a plurality of protrusions 35 and a plurality of recesses 36 extending in the axial direction on the outer peripheral surface. The plurality of convex portions 35 and the plurality of concave portions 36 are alternately arranged along the circumferential direction. In the present embodiment, the plurality of convex portions 35 and the plurality of concave portions 36 are provided by knurling. That is, the second shaft 30 has a plurality of convex portions 35 and a plurality of concave portions 36 on the outer peripheral surface of the portion pressed into the central hole 14. Therefore, the stress applied to the outer peripheral surface of the second inserted portion 31 from the inner peripheral surface of the central hole 14 by the press-fitting is released and absorbed by the circumferential deformation of the convex portion 35, and the pressure at the time of the press-fitting can be reduced.

In the axial direction, one axial end of the second inserted portion 31 is arranged to be separated from the other axial end of the first inserted portion 21. That is, the first shaft 20 and the second shaft 30 are provided separately in the axial direction. In the present embodiment, a portion between the first shaft 20 and the second shaft 30 in the interior of the center hole 14 is a hollow.

The second contact portion 32 is located at the other axial edge of the second inserted portion 31. The second contact portion 32 has a disc shape centered on the central axis J. The plate surface of the second contact portion 32 faces the axial direction. The second contact portion 32 protrudes radially outward from the outer peripheral surface of the second inserted portion 31. The outer diameter of the second contact portion 32 is larger than the outer diameter of the second inserted portion 31. The radially outer end of the second contact portion 32 is located radially inward of the through hole 15. The surface of the second contact portion 32 facing one axial side contacts the surface of the rotor core 12 facing the other axial side. That is, the second shaft 30 has a second contact portion 32 that contacts the surface of the rotor core 12 facing the other axial side.

The body portion 33 extends from the other side in the axial direction of the second inserted portion 31. The body 33 has a cylindrical shape extending in the axial direction around the central axis J. The main body portion 33 has a base portion 33a and an output portion 33b.

The base portion 33a is connected to the other axial side of the second inserted portion 31. The outer diameter of the base portion 33a is smaller than the outer diameter of the second contact portion 32. Although not shown, the outer peripheral surface of the base portion 33a is supported by a bearing 76. Thereby, the bearing 76 rotatably supports the second shaft 30. Although not shown, the outer peripheral surface of the base portion 33a contacts the oil seal 77 at the other axial side than the bearing 76. Thereby, the oil seal 77 seals between the inner peripheral surface of the hole portion 41c and the outer peripheral surface of the second shaft 30.

The output portion 33b is connected to the other axial side of the base portion 33a. The outer diameter of the output portion 33b is smaller than the outer diameter of the base portion 33a. The other axial end of the output portion 33b is the other axial end of the second shaft 30. The output portion 33b has a spline groove on its outer peripheral surface. The output portion 33b is inserted inside the inner rotor 61 and coupled to the inner rotor 61. Thereby, the second shaft 30 is coupled to the inner rotor 61. More specifically, the second shaft 30 and the inner rotor 61 are coupled by spline grooves provided on the inner peripheral surface of the inner rotor 61 being fitted into spline grooves of the output portion 33b. The driving force of the rotor 10 is transmitted to the inner rotor 61 via the second shaft 30. Thereby, the rotating electric machine 80 rotates the inner rotor 61 and the outer rotor 62 about the center axis J.

As shown in fig. 2 and 3, resin member 50 is fixed to rotor core 12. The resin member 50 is made of resin. The resin member 50 is produced, for example, by press-fitting the first shaft 20 and the second shaft 30 into the central hole 14 of the rotor core 12, and then insert-molding the first shaft 20, the second shaft 30, and the rotor body 11 as insert members. The resin member 50 includes a first plate-shaped portion 51, a second plate-shaped portion 52, a plurality of coupling portions 53, and a plurality of side surface coupling portions 54.

The first plate-like portion 51 has an annular plate shape centered on the central axis J. The plate surface of the first plate-like portion 51 faces the axial direction. The first plate-like portion 51 is provided on a surface of the rotor core 12 facing one axial side. In the present embodiment, the radially outer end of the first plate-like portion 51 is disposed at the same position in the radial direction as the radially outer end of the rotor core 12. The first plate-like portion 51 surrounds the first contact portion 22. In the present embodiment, the inner edge of the first plate-like portion 51 contacts the outer edge of the first contact portion 22. The first plate-like portion 51 and the first contact portion 22 may not be in contact with each other.

The second plate-like portion 52 has an annular plate shape centered on the central axis J. The plate surface of the second plate-shaped portion 52 faces the axial direction. The second plate-like portion 52 is provided on the surface of the rotor core 12 facing the other axial side. In the present embodiment, the radially outer end of the second plate-like portion 52 is disposed at the same position in the radial direction as the radially outer end of the rotor core 12. The second plate-like portion 52 surrounds the second contact portion 32. In the present embodiment, the inner edge of the second plate-like portion 52 contacts the outer edge of the second contact portion 32. The second plate-like portion 52 and the second contact portion 32 may not be in contact with each other.

As shown in fig. 3 and 4, the plurality of coupling portions 53 are provided inside the through-hole 15, respectively. Each coupling portion 53 has a cylindrical shape extending in the axial direction. The outer peripheral surface of each coupling portion 53 is in contact with the inner peripheral surface of each through hole 15 over the entire axial range. One end in the axial direction of each coupling portion 53 is connected to the surface of the first plate-like portion 51 facing the other end in the axial direction. The other end in the axial direction of each coupling portion 53 is connected to the surface of the second plate-like portion 52 facing one axial direction. In the present embodiment, the number of the connection portions 53 is 8. In the present embodiment, the coupling portions 53 having a large outer diameter and the coupling portions 53 having a small outer diameter are alternately provided in the circumferential direction.

As shown in fig. 2 and 4, the plurality of side surface connecting portions 54 have a substantially triangular prism shape extending in the axial direction along the outer peripheral surface of the rotor core 12. Each side surface coupling portion 54 has a substantially triangular shape when viewed in the axial direction. Each side surface coupling portion 54 is provided on the outer peripheral surface of the rotor core 12. Each of the side surface connecting portions 54 is provided between the outer core portions 17 adjacent to each other in the circumferential direction. The side surface connecting portions 54 are provided at equal intervals in the circumferential direction. In the present embodiment, 8 side surface connecting portions 54 are provided. One axial end of each side surface coupling portion 54 is connected to a radially outer end of the first plate-like portion 51. The other axial end of each side surface coupling portion 54 is connected to the radially outer end of the second plate-like portion 52.

According to the present embodiment, the rotor 10 has two shafts, the first shaft 20 and the second shaft. The first shaft 20 is fixed to the rotor core 12 such that the other end in the axial direction is inserted into the center hole 14. The second shaft 30 is fixed to the rotor core 12 such that one end portion in the axial direction is inserted into the center hole 14. In addition, the first shaft 20 and the second shaft 30 are provided separately in the axial direction. Therefore, the first shaft 20 and the second shaft 30 of the present embodiment can be used for a rotor core having a different axial dimension from the rotor core 12 of the present embodiment. Specifically, the first shaft 20 and the second shaft 30 of the present embodiment can be used for a rotor core having a larger axial dimension than the rotor core 12 of the present embodiment. In addition, as for the rotor core having a smaller axial dimension than the rotor core 12 of the present embodiment, the first shaft 20 and the second shaft 30 of the present embodiment may be used as long as the axial dimension of the rotor core is smaller than the axial dimension obtained by adding the axial dimension of the first inserted portion 21 and the axial dimension of the second inserted portion 31. Therefore, the first shaft 20 and the second shaft 30 can be used for other rotor cores having different axial dimensions. Therefore, for example, when a plurality of types of rotating electrical machines 80 having different axial dimensions of the rotor core 12 are manufactured, the shafts provided to the respective rotating electrical machines 80 can be shared as the first shaft 20 and the second shaft 30. Accordingly, when manufacturing a plurality of types of rotating electric machines 80 having different axial dimensions of the rotor core 12, the manufacturing cost of each rotating electric machine 80 can be reduced. Further, even when the axial dimension of the rotor core 12 is changed, the first shaft 20 and the second shaft 30 do not need to be changed, and therefore, the cost caused by the design change of the rotating electrical machine 80 can be reduced.

According to the present embodiment, the rotor core 12 is formed by stacking a plurality of plate members 12a in the axial direction. Therefore, by changing the number of the plate members 12a, the axial dimension of the rotor core 12 can be easily changed. Therefore, the cost caused by the design change of the rotating electric machine 80 can be further reduced. By applying the first shaft 20 and the second shaft 30 to the rotor core 12 in which the axial dimension of the rotor core 12 is relatively easily changed in this way, the axial dimension of the rotor core 12 can be easily changed, and the manufacturing cost of the rotating electrical machine 80 can be appropriately reduced.

According to the present embodiment, the first shaft 20 and the second shaft 30 are each press-fitted into the central hole 14 of the rotor core 12 and fixed to the rotor core 12. Therefore, the first shaft 20 and the second shaft 30 can be easily fixed to the rotor core 12 with high shaft accuracy. Therefore, when the rotor 10 rotates, the first shaft 20 and the second shaft 30 can be suppressed from being eccentric with respect to the center axis J, and therefore, noise can be suppressed when the rotor 10 rotates.

According to the present embodiment, the first shaft 20 has a plurality of convex portions 25 and a plurality of concave portions 26 on the outer peripheral surface of the first inserted portion 21, which is a portion pressed into the central hole 14. The second shaft 30 has a plurality of convex portions 35 and a plurality of concave portions 36 on the outer peripheral surface of the second inserted portion 31, which is a portion pressed into the central hole 14. Therefore, when the first shaft 20 and the second shaft 30 are press-fitted into the central hole 14, the stress applied to the outer peripheral surface of the first inserted portion 21 and the outer peripheral surface of the second inserted portion 31 from the inner peripheral surface of the central hole 14 of the rotor core 12 is released and absorbed by the protrusions 25 and 35 deforming in the circumferential direction, and the pressure at the time of press-fitting each shaft can be reduced. Therefore, the first shaft 20 and the second shaft 30 can be easily press-fitted into the central hole 14 of the rotor core 12 and fixed. Therefore, the assembling property of the rotor 10 is improved, and thus the assembling man-hours and the assembling time of the rotor 10, the rotary electric machine 80, and the pump 90 can be reduced.

According to the present embodiment, the first shaft 20 has the first contact portion 22 that contacts the surface of the rotor core 12 facing one axial side. The second shaft 30 has a second contact portion 32 that contacts the surface of the rotor core 12 facing the other axial side. Therefore, when the first shaft 20 and the second shaft 30 are press-fitted into the central hole 14 of the rotor core 12, the first shaft 20 and the second shaft 30 can be easily positioned in the axial direction of the rotor core 12. Therefore, the assembling property of the rotor 10 is improved, and thus the assembling man-hours and the assembling time of the rotor 10, the rotary electric machine 80, and the pump 90 can be further reduced.

According to the present embodiment, the first plate-like portion 51 provided on the surface facing one axial side of the rotor core 12 and the second plate-like portion 52 provided on the surface facing the other axial side of the rotor core 12 are connected via the plurality of connecting portions 53 and the plurality of side surface connecting portions 54. Therefore, the resin member 50 can be suppressed from moving in the axial direction with respect to the rotor core 12. Further, the resin member 50 can be suppressed from rotating relative to the rotor core 12 in the circumferential direction. This enables resin member 50 to be more firmly fixed to rotor core 12.

< second embodiment >

As shown in fig. 6, in the rotor 210 of the present embodiment, the rotor core 212 of the rotor body 211 has a convex portion 218 and a concave portion 219 extending in the axial direction on the inner peripheral surface of the center hole 214. In the present embodiment, the convex portion 218 has a rectangular shape protruding radially inward from the inner peripheral surface of the center hole 214. The projections 218 are provided at equal intervals at intervals in the circumferential direction. The recesses 219 are located between the protrusions 218 adjacent to each other. The recess 219 is a part of the inner peripheral surface of the center hole 214. In the present embodiment, 8 convex portions 218 and 8 concave portions 219 are provided, respectively. In the present embodiment, the position of the axial end of each of the convex portion 218 and the concave portion 219 is the same as the position of the axial end of the rotor core 212. In the present embodiment, the position of the other axial end of each of the convex portion 218 and the concave portion 219 is the same as the position of the other axial end of the rotor core 212. Therefore, the rotor core 212 has a plurality of protrusions 218 and a plurality of recesses 219 on the inner circumferential surface of the center hole 214 into which the first shaft 220 is press-fitted and the inner circumferential surface of the center hole 214 into which the second shaft 230 is press-fitted. Other structures of the rotor core 212 are the same as those of the rotor core 12 of the first embodiment.

As shown in fig. 7, in the first shaft 220 of the present embodiment, the outer periphery of the first inserted portion 221 is formed in a circumferential shape centered on the central axis J as viewed in the axial direction. That is, in the present embodiment, no convex portion or concave portion is provided on the outer peripheral surface of the first inserted portion 221. Other structures of the first shaft 220 are the same as those of the first shaft 20 of the first embodiment.

In the second shaft 230 of the present embodiment, the outer periphery of the second inserted portion 231 has a circular shape centered on the central axis J when viewed from the axial direction. That is, in the present embodiment, no convex portion or concave portion is provided on the outer peripheral surface of the second inserted portion 231. The other structure of the second shaft 230 is the same as that of the second shaft 30 of the first embodiment.

According to the present embodiment, the rotor core 212 has a plurality of convex portions 218 and a plurality of concave portions 219 on the inner circumferential surface of the center hole 214, which is a portion where the first inserted portion 221 of the first shaft 220 and the second inserted portion 231 of the second shaft 230 are press-fitted. Therefore, when the first shaft 220 and the second shaft 230 are press-fitted into the central hole 214, the stress applied to the inner peripheral surface of the rotor core 212 from the outer peripheral surface of the first inserted portion 221 and the outer peripheral surface of the second inserted portion 231 is released and absorbed by the projection 218 deforming in the circumferential direction, and the pressure at the time of press-fitting each shaft can be reduced. Therefore, first shaft 220 and second shaft 230 can be easily press-fitted into central hole 214 of rotor core 212 and fixed. Therefore, the ease of assembly of the rotor 210 is improved, and the number of assembly steps and assembly time of the rotor 210, the rotary electric machine 280, and the pump 290 can be reduced.

In the present embodiment, the positions, shapes, and the like of the convex portion 218 and the concave portion 219 are not particularly limited as long as the first shaft 220 and the second shaft 230 can be press-fitted into and fixed to the rotor core 212. For example, the convex portion 218 may have a triangular shape or a semicircular shape that protrudes radially inward from the inner peripheral surface of the center hole 214. The number of the convex portions 218 and the concave portions 219 is not limited to 8, and may be 4, for example.

< third embodiment >

As shown in fig. 8, 9, and 10, in the rotor 310 of the present embodiment, the first contact portion 322 of the first shaft 320 has a disc shape extending radially outward of the through hole 15 of the rotor core 12 around the central axis J. In the present embodiment, the outer diameter of the first contact portion 322 is the same as the outer diameter of the rotor core 12. That is, the radially outer end of the first contact portion 322 is disposed radially outward of the plurality of through holes 15. Further, as long as the first contact portion 322 can be provided with a first opening 325, which will be described later, as appropriate, the radially outer end of the first contact portion 322 may be disposed between the through hole 15 and the radially outer end of the rotor core 12.

The first contact portion 322 has a plurality of first openings 325 that penetrate the first contact portion 322 in the axial direction at portions facing the plurality of through holes 15 of the rotor core 12. Each first opening 325 is a circular hole. In the present embodiment, the inner diameter of each first opening 325 is the same as the inner diameter of the through hole 15 in which each first opening 325 faces. The first openings 325 are arranged at equal intervals along the circumferential direction at intervals. The first openings 325 are provided in 8 numbers. In the present embodiment, the first openings 325 having a large inner diameter and the first openings 325 having a small inner diameter are alternately arranged in the circumferential direction. The inner diameter of each first opening 325 may be larger than the inner diameter of the through hole 15. Other structures of the first shaft 320 are the same as those of the first shaft 20 of the first embodiment.

In the rotor 310 of the present embodiment, the second contact portion 332 of the second shaft 330 has a disk shape extending radially outward of the through hole 15 of the rotor core 12 around the central axis J. In the present embodiment, the outer diameter of the second contact portion 332 is the same as the outer diameter of the rotor core 12. That is, the radially outer end of the second contact portion 332 is disposed radially outward of the plurality of through holes 15. Further, if a second opening 335, which will be described later, can be appropriately provided in the second contact portion 332, the radially outer end of the second contact portion 332 may be disposed between the through hole 15 and the radially outer end of the rotor core 12.

The second contact portion 332 has a plurality of second openings 335 that axially penetrate the second contact portion 332 at portions facing the plurality of through holes 15 of the rotor core 12. Each second opening 335 is a circular shaped hole. In the present embodiment, the inner diameter of each second opening 335 is the same as the inner diameter of the through hole 15 in which each second opening 335 faces. The second openings 335 are equally spaced apart at intervals along the circumferential direction. The second openings 335 are provided in 8 numbers. In the present embodiment, the second openings 335 having a large inner diameter and the second openings 335 having a small inner diameter are alternately provided in the circumferential direction. The inner diameter of each second opening 335 may be larger than the inner diameter of the through hole 15. The other structure of the second shaft 330 is the same as that of the second shaft 30 of the first embodiment.

As shown in fig. 8 and 9, in the rotor 310 of the present embodiment, the first plate-shaped portion 351 of the resin member 350 has an annular plate shape extending radially outward of the first opening 325 with the center axis J as the center. The plate surface of the first plate-like portion 351 faces in the axial direction. The first plate-like portion 351 is provided on a surface of the first contact portion 322 facing one side in the axial direction. In the present embodiment, the radially outer end of the first plate-like portion 351 is disposed at the same position in the radial direction as the radially outer end of the first contact portion 322. The first plate-like portion 351 surrounds the first body portion 23a of the first shaft 320. In the present embodiment, the inner edge of the first plate-like portion 351 is in contact with the outer edge of the first body portion 23a. The first plate-like portion 351 and the first body portion 23a may not be in contact with each other.

In the rotor 310 of the present embodiment, the second plate-shaped portion 352 of the resin member 350 has an annular plate shape extending radially outward of the second opening 335 around the central axis J. The plate surface of the second plate-like portion 352 faces the axial direction. The second plate-like portion 352 is provided on the surface of the second contact portion 332 facing the other side in the axial direction. In the present embodiment, the radially outer end of the second plate-like portion 352 is arranged at the same position in the radial direction as the radially outer end of the second contact portion 332. The second plate portion 352 surrounds the base portion 33a of the second shaft 330. In the present embodiment, the inner edge of the second plate-like portion 352 contacts the outer edge of the base portion 33a. The second plate portion 352 may not contact the base portion 33a.

In the rotor 310 of the present embodiment, the plurality of coupling portions 353 of the resin member 350 are provided to extend across the inside of the through hole 15, the inside of the first opening 325, and the inside of the second opening 335, respectively. Each coupling portion 353 has a cylindrical shape extending in the axial direction. The outer peripheral surface of each coupling portion 353 is in contact with the inner peripheral surface of each through hole 15, the inner peripheral surface of each first opening 325, and the inner peripheral surface of each second opening 335 over the entire axial range. One end in the axial direction of each coupling portion 353 is connected to the surface of the first plate-like portion 351 facing the other end in the axial direction. The other end in the axial direction of each coupling portion 353 is connected to the surface of the second plate-like portion 352 facing one axial direction. That is, the resin member 350 has a plurality of coupling portions 353 axially coupling the first plate-like portion 351 and the second plate-like portion 352 via the through hole 15, the first opening 325, and the second opening 335. In the present embodiment, the number of the connection portions 353 is 8. In the present embodiment, the coupling portions 353 having a large outer diameter and the coupling portions 353 having a small outer diameter are alternately provided in the circumferential direction. The other structure of the resin member 350 is the same as that of the resin member 50 of the first embodiment.

According to the present embodiment, the resin member 350 has a plurality of coupling portions 353 provided across the through-hole 15 of the rotor core 12, the first opening 325 of the first shaft 320, and the second opening 335 of the second shaft 330. The first plate-like portion 351 provided on the surface facing one axial side of the first contact portion 322 of the first shaft 320 and the second plate-like portion 352 provided on the surface facing the other axial side of the second contact portion 332 of the second shaft 330 are connected to each other via the plurality of coupling portions 353 and the plurality of side surface coupling portions 54. Therefore, the resin member 350 can be prevented from moving in the axial direction with respect to the rotor core 12. Further, the resin member 350 can be suppressed from rotating relative to the rotor core 12 in the circumferential direction. This enables resin member 350 to be more firmly fixed to rotor core 12. Further, the first shaft 320 and the second shaft 330 can be suppressed from rotating relative to the rotor core 12 in the circumferential direction. This enables first shaft 320 and second shaft 330 to be more firmly fixed to rotor core 12.

The present invention is not limited to the above-described embodiments, and other structures and other methods can be adopted within the scope of the technical idea of the present invention. For example, the outer core portion of the rotor core may have an annular shape. The rotor core may not have an outer core portion. Further, if both ends of the coupling portion in the axial direction are connected to the first plate-like portion and the second plate-like portion, all the through holes may have the same shape or may have different shapes.

The shape of the convex portion and the concave portion provided on the outer peripheral surface of the first inserted portion and the outer peripheral surface of the second inserted portion may be any shape as long as the first shaft and the second shaft can be press-fitted into the rotor core and fixed thereto. For example, the convex portions and the concave portions may have a shape extending in the circumferential direction, a diagonal shape, or the like. In addition, one of the first shaft and the second shaft may not have the convex portion and the concave portion. The first shaft and the second shaft and the rotor core can also be fixedly bonded.

The shape of the convex portion and the concave portion provided on the inner peripheral surface of the center hole of the rotor core may be any shape as long as the first shaft and the second shaft can be press-fitted into the rotor core and fixed thereto. For example, the convex portions and the concave portions may have a shape extending in the circumferential direction, a diagonal shape, or the like. In addition, when the convex portion and the concave portion are provided on the inner peripheral surface of the center hole, the convex portion and the concave portion may be provided on the outer peripheral surface of the first inserted portion and the outer peripheral surface of the second inserted portion. In this case, the pressure at the time of pressing each shaft in can be further reduced. Therefore, the first shaft and the second shaft can be more easily press-fitted and fixed to the center hole of the rotor core. In addition, only one of the outer peripheral surface of the first inserted portion or the outer peripheral surface of the second inserted portion may have a convex portion and a concave portion.

The portion between the first shaft and the second shaft in the interior of the central hole does not need to be a hollow, and for example, a cooling member can be provided. In this case, when the rotor continuously rotates, the temperature rise of the rotor can be suppressed. In addition, a magnetic member made of a magnetic material may be provided. In this case, the output torque of the rotor can be increased. In the portion between the first shaft and the second shaft in the inside of the center hole, other members and the like can be appropriately provided according to the purpose.

The resin member may have any structure if it is stably fixed to the rotor core. The number of the connection portions does not need to be 8, and may be 4, for example. All the coupling parts may have the same shape or may have different shapes. The number of the side connecting portions does not need to be 8, and may be 4, for example. In addition, the side connection portion may not be provided.

The use of the rotating electric machine to which the rotor of the present invention is applied is not particularly limited. The rotating electric machine may be mounted on a device other than the pump. The rotating electric machine is not limited to a motor, and may be a generator. The use of the pump having the rotating electric machine is not particularly limited. The type of fluid delivered by the pump is not particularly limited, and may be water or the like. The rotating electric machine and the pump may be mounted on a device other than the vehicle. In addition, the structures and the methods described in this specification can be combined as appropriate within a range not inconsistent with each other.

Claims (9)

1. A rotor capable of rotating around a central axis,

the rotor has:

a rotor core;

a first shaft fixed to the rotor core and protruding to one axial side than the rotor core; and

a second shaft fixed to the rotor core and protruding to the other side in the axial direction than the rotor core,

the rotor core has a central hole axially penetrating the rotor core,

an end portion of the other axial side of the first shaft is inserted into the central hole,

an end portion of one axial side of the second shaft is inserted into the central hole,

the first shaft and the second shaft are provided separately in the axial direction.

2. The rotor of claim 1,

the rotor core is formed by stacking a plurality of plate members in the axial direction.

3. The rotor of claim 1 or 2,

the first shaft and the second shaft are respectively press-fitted into the central hole and fixed to the rotor core.

4. The rotor of claim 3,

at least one of the first shaft and the second shaft has a plurality of convex portions and a plurality of concave portions on an outer peripheral surface of a portion pressed into the central hole.

5. The rotor of claim 3,

the rotor core has a plurality of convex portions and a plurality of concave portions in at least one of an inner peripheral surface of a portion of the central hole into which the first shaft is press-fitted and an inner peripheral surface of a portion of the central hole into which the second shaft is press-fitted.

6. The rotor of claim 1 or 2,

the first shaft has a first contact portion that contacts a surface of the rotor core facing one axial side,

the second shaft has a second contact portion that contacts a surface of the rotor core facing the other axial side.

7. The rotor of claim 6,

the rotor has a resin member fixed to the rotor core,

the rotor core has a plurality of through holes penetrating the rotor core in an axial direction,

a plurality of the through holes are provided at intervals along the circumferential direction,

a radially outer end of the first contact portion and a radially outer end of the second contact portion are located radially outward of the plurality of through holes,

the first contact portion has a plurality of first openings axially penetrating the first contact portion at portions opposed to the plurality of through holes,

the second contact portion has a plurality of second openings axially penetrating the second contact portion at portions opposed to the plurality of through holes,

the resin member has:

a first plate-like portion provided on a surface of the first contact portion facing one axial side;

a second plate-like portion provided on a surface of the second contact portion facing the other side in the axial direction; and

and a plurality of coupling portions that axially couple the first plate-like portion and the second plate-like portion via the inside of each through hole, the inside of each first opening, and the inside of each second opening.

8. A rotating electrical machine is characterized in that,

the rotating electric machine includes:

the rotor of any one of claims 1 to 7; and

and a stator facing the rotor with a gap therebetween.

9. A pump is characterized in that the pump is provided with a pump body,

the pump has:

a rotating electrical machine according to claim 8; and

a pump mechanism coupled to the rotor.

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