JP7435490B2 - Rotating electric machine rotor - Google Patents

Description

The present invention relates to a rotor for a rotating electric machine.

The rotor of the rotating electric machine disclosed in Patent Document 1 includes a cylindrical member, a magnetic body disposed within the cylindrical member, and a shaft member adjacent to the magnetic body in the axial direction of the cylindrical member. For example, the shaft member is press-fitted from an end of the cylindrical member in the axial direction with a magnetic body disposed within the cylindrical member. The shaft member is fixed to the inner surface of the cylindrical member by being press-fitted into the cylindrical member.

Japanese Patent Application Publication No. 2004-112849

When press-fitting the shaft member into the cylindrical member, lubricating oil is applied onto the inner surface of the cylindrical member in order to smoothly press-fit the shaft member into the cylindrical member. As the shaft member is press-fitted into the cylindrical member, the end surface of the shaft member approaches the end surface of the magnetic body in the axial direction of the cylindrical member. At this time, within the cylindrical member, the lubricating oil is pushed out by the end face of the magnetic body and the end face of the shaft member, so that the lubricating oil may remain near the edge of the end face of the magnetic body or near the edge of the end face of the shaft member. be. It is undesirable for a large amount of lubricating oil to remain in the cylindrical member because it causes unbalanced rotation of the rotor.

A rotor for a rotating electrical machine that solves the above problems includes a cylindrical member, a magnetic body disposed within the cylindrical member, and a magnetic body that is press-fitted into the cylindrical member and adjacent to the magnetic body in the axial direction of the cylindrical member. A rotor for a rotating electric machine comprising a shaft member, wherein the magnetic body has a magnetic end face at an end in the axial direction, and the shaft member has a magnetic end face at an end in the axial direction. The rotor has adjacent shaft member end surfaces, and the rotor communicates with the outside of the cylinder member via a through hole penetrating the cylinder member, and the magnetic material end surface and the shaft member end surface that are adjacent in the axial direction. a passage portion located on at least one side, the through hole overlapping an edge of the magnetic body end surface and an edge of the shaft member end surface when viewed from a direction perpendicular to the axis of the cylindrical member; The passage portion is characterized in that air that has flowed in from outside the cylindrical member through the through hole can flow out toward the through hole.

According to the above configuration, air can be introduced into the passage portion by introducing air into the cylindrical member through the through hole. The air introduced into the passage is discharged from the through hole after passing through the passage. Even if lubricating oil remains inside the cylindrical member, the lubricating oil is sucked by the air flow through the passage, so that the lubricating oil is discharged out of the cylindrical member along with the air through the through hole. Therefore, the amount of lubricating oil remaining within the cylindrical member can be reduced.

In the rotor of a rotating electric machine, a plurality of the through holes may be arranged at different positions of the cylindrical member.
According to the above configuration, some of the through holes are used as air introduction holes for introducing air into the cylindrical member, and other through holes are used as air exhaust holes for discharging air from within the cylindrical member. can. Therefore, compared to the case where one through hole functions as both an air introduction hole and an air discharge hole, air can be introduced into the cylindrical member through the passage and air can be discharged from the cylindrical member more smoothly. It can be carried out. Therefore, the amount of lubricating oil remaining within the cylindrical member can be further reduced.

In a rotor of a rotating electric machine, when a virtual plane perpendicular to the orthogonal direction at a position including the axis of the cylindrical member is a virtual plane, the through hole is symmetrical with respect to the virtual plane as a plane of symmetry. It may be arranged in the cylinder member.

According to the above configuration, it is possible to suppress the occurrence of unbalanced rotation of the rotor due to the formation of the through hole in the cylindrical member.
In a rotor of a rotating electric machine, when an end surface having the passage section is defined as a passage end surface among the magnetic body end surface and the shaft member end surface, the passage section may include a groove section located along the passage end surface.

In the rotor of a rotating electric machine, the groove extends in the orthogonal direction, one end of the groove in the orthogonal direction is a first end, and the other end of the groove in the orthogonal direction is a second end; The first end and the second end are connected to an edge of the passage end surface, two or more of the through holes are arranged at different positions of the cylindrical member, and one of the two through holes is , one of the through holes may be connected to the first end, and the other through hole may be connected to the second end.

According to the above configuration, one of the two through holes is used as an air introduction hole for introducing air into the cylindrical member, and the other through hole is used for discharging air from within the cylindrical member. Can be used as an air exhaust hole. Among the two through holes, one through hole is connected to the first end, and the other through hole is connected to the second end. Therefore, air is introduced into the first end from outside the cylindrical member through the through hole. Air flows from the first end to the second end of the groove. The air that has passed through the groove is discharged from the second end to the outside of the cylindrical member through the through hole. Therefore, since air can be smoothly introduced into the cylindrical member through the passage and air can be discharged from the cylindrical member, the amount of lubricating oil remaining in the cylindrical member can be further reduced.

In a rotor of a rotating electric machine, when an end face having the passage portion is defined as a passage end face among the magnetic body end face and the shaft member end face, the passage portion is located along the edge of the passage end face and is located along the edge of the passage end face. The cylindrical member may have a tapered side surface that approaches the inner surface of the cylindrical member as it becomes farther away from the end surface in the axial direction.

In the rotor of a rotating electric machine, a plurality of the magnetic bodies are adjacent to each other in the axial direction, one of the magnetic bodies among the plurality of magnetic bodies is a first magnetic body, and the first magnetic body and the axial direction are adjacent to each other. When the adjacent magnetic bodies are a second magnetic body, the through hole is a first through hole, and the passage part is a first passage part, the first magnetic body has a first magnetic body at an end in the axial direction. the second magnetic body has a second magnetic body end face adjacent to the first magnetic body end face at the end in the axial direction, and the rotor passes through the cylindrical member. a second passage portion communicating with the outside of the cylindrical member via a second through hole and located on at least one of the first magnetic body end face and the second magnetic body end face; , when viewed from the orthogonal direction, overlaps with an edge of the first magnetic body end face and an edge of the second magnetic body end face, and the second passage portion is connected to the cylindrical member through the second through hole. Air flowing in from the outside may be allowed to flow out toward the second through hole.

When the first magnetic body and the second magnetic body are press-fitted into the cylindrical member, lubricating oil may remain near the edge of the first magnetic body end face or near the edge of the second magnetic body end face. According to the above configuration, such lubricating oil is sucked by the air flow through the second passage section. Thereby, the lubricating oil is discharged to the outside of the cylindrical member together with the air through the second through hole. Therefore, the amount of lubricating oil remaining within the cylindrical member can be further reduced.

According to this invention, it is possible to reduce lubricating oil remaining in the cylindrical member.

A sectional view showing a rotating electric machine. FIG. 3 is an enlarged cross-sectional view of a portion of the rotor. FIG. 3 is an exploded perspective view of the rotor. FIG. 3 is a side view of the rotor seen from the radial direction. A cross-sectional view of the rotor. A cross section for explaining how a magnetic body and a shaft member are press-fitted into a cylindrical member. FIG. 3 is a cross-sectional view for explaining how lubricating oil is discharged from the cylindrical member. FIG. 3 is a cross-sectional view for explaining how lubricating oil is discharged from the cylindrical member. FIG. 7 is a cross-sectional view for explaining how lubricating oil is discharged from a cylindrical member in a modified example. FIG. 7 is a cross-sectional view for explaining how lubricating oil is discharged from a cylindrical member in a modified example. FIG. 7 is a cross-sectional view for explaining how lubricating oil is discharged from a cylindrical member in a modified example. FIG. 7 is a cross-sectional view for explaining how lubricating oil is discharged from a cylindrical member in a modified example.

Hereinafter, embodiments embodying a rotor of a rotating electrical machine will be described using FIGS. 1 to 8. In the following, for convenience of explanation, the configuration of the rotating electrical machine will first be explained.
[Configuration of rotating electrical machine]
As shown in FIG. 1, the rotating electrical machine 10 is housed in a cylindrical housing 11. As shown in FIG. The housing 11 includes a first housing component 12 and a plate-shaped second housing component 13. The first housing component 12 and the second housing component 13 are made of metal, for example, aluminum.

The first housing structure 12 has a plate-shaped bottom wall 12a and a peripheral wall 12b extending in a cylindrical shape from the outer peripheral end of the bottom wall 12a. The second housing component 13 is connected to the first housing component 12 in a state where an opening in the peripheral wall 12b on the side opposite to the bottom wall 12a is closed.

The first housing structure 12 includes a cylindrical first boss portion 12c. The first boss portion 12c protrudes from the inner surface of the bottom wall 12a. The second housing structure 13 includes a cylindrical second boss portion 13c. The second boss portion 13c protrudes from the inner surface of the second housing structure 13. The axis of the first boss portion 12c, the axis of the second boss portion 13c, and the axis of the peripheral wall 12b of the first housing structure 12 coincide with each other. A bearing 14 is disposed on each of the inner circumferential surface of the first boss portion 12c and the inner circumferential surface of the second boss portion 13c.

[Configuration of stator and rotor]
The rotating electrical machine 10 includes a stator 15 and a rotor 19. The stator 15 includes a cylindrical stator core 15a and a coil 15b. Stator core 15a is fixed to the inner peripheral surface of peripheral wall 12b. Coil 15b is wound around stator core 15a. The rotor 19 includes a cylindrical member 20, a magnetic body 30, a shaft member 40, and a passage portion 60.

[Configuration of cylinder member]
The cylindrical member 20 has a cylindrical shape with an axis extending linearly. The cylindrical member 20 is made of, for example, a metal material. The axis of the cylindrical member 20 coincides with the axis of the first boss portion 12c and the axis of the second boss portion 13c. Hereinafter, the axis of the cylindrical member 20 will be referred to as an axis L. The direction in which the axis L extends is called an axial direction X.

As shown in FIGS. 2 and 3, the opening at one end of the cylindrical member 20 in the axial direction X is referred to as a first opening 21, and the opening at the other end of the cylindrical member 20 in the axial direction X is referred to as a second opening 22. Both the first opening 21 and the second opening 22 are circular holes. The inner diameter of the cylindrical member 20 is the same throughout the axial direction X including the first opening 21 and the second opening 22. Hereinafter, the direction in which the diameters of the first opening 21 and the second opening 22 extend will be referred to as the radial direction Y. The radial direction Y corresponds to an orthogonal direction perpendicular to the axis L of the cylindrical member 20.

A through hole 24 is formed in the cylindrical member 20 . The through hole 24 is an elongated hole in which the diameter of the through hole 24 extending in the axial direction X is longer than the diameter perpendicular to the axis L when viewing the cylindrical member 20 from the radial direction Y, for example.

A plurality of through holes 24 are arranged at different positions of the cylindrical member 20. The two through holes 24 are spaced apart from each other in the radial direction Y. Hereinafter, for convenience of explanation, one of the two through holes 24 will also be referred to as the through hole 25, and the other will also be referred to as the through hole 26. One pair of the through holes 25 and one pair of the through holes 26 are located at a position biased to one side and a position biased to the other side of the intermediate position of the cylindrical member 20 in the axial direction X. That is, in this embodiment, four through holes 24 are arranged in the cylindrical member 20.

As shown in FIG. 3, at a position including the axis L of the cylindrical member 20, a virtual plane orthogonal to the radial direction Y is defined as a virtual plane P. The through holes 24 are arranged in the cylindrical member 20 so as to be symmetrical with respect to the virtual plane P as a plane of symmetry. Specifically, the through hole 25 and the through hole 26 face each other in the radial direction Y. That is, when the cylindrical member 20 is viewed from the radial direction Y, the through holes 25 and 26 are located so as to overlap each other. The two through holes 25 face each other in the axial direction X. The two through holes 26 face each other in the axial direction X. That is, when the cylindrical member 20 is viewed from the axial direction X, the through holes 25 overlap each other, and the through holes 26 overlap each other.

On the outer peripheral surface of the cylindrical member 20, the opening edges of the two through holes 25 are spaced apart from each other in the axial direction X, and the opening edges of the two through holes 26 are spaced apart from each other in the axial direction X. Among the distances between the through holes 25 in the axial direction X, the shortest distance is referred to as the shortest distance L1, and the longest distance is referred to as the longest distance L2. The shortest separation length L1 corresponds to the length of the portion of the cylindrical member 20 between the two through holes 24 in the axial direction X. The longest separation length L2 corresponds to the sum of the diameters of the two through holes 24 in the axial direction X to the shortest separation length L1.

[Configuration of magnetic material]
The magnetic body 30 has a solid cylindrical shape. The magnetic body 30 of this embodiment is a permanent magnet. The magnetic body 30 is arranged inside the cylindrical member 20. The axis of the magnetic body 30 coincides with the axis L. The outer diameter of the magnetic body 30 is the same as the inner diameter of the cylindrical member 20. The magnetic body 30 is press-fitted inside the cylindrical member 20 . The magnetic body 30 is fixed to the inner circumferential surface 20a of the cylindrical member 20 by bringing the outer circumferential surface 30a of the magnetic body 30 into close contact with the inner circumferential surface 20a of the cylindrical member 20. The magnetic body 30 is magnetized in the radial direction of the magnetic body 30.

The magnetic body 30 has magnetic body end faces 31 at both ends in the axial direction X. The magnetic body end surface 31 is a flat surface perpendicular to the axis L. The magnetic body end face 31 at one end of the magnetic body 30 in the axial direction X is also referred to as a first end face 32 , and the magnetic body end face 31 at the other end of the magnetic body 30 in the axial direction X is referred to as a second end face 33 .

The dimension of the magnetic body 30 in the axial direction X is referred to as a magnetic body dimension L3. The magnetic body dimension L3 corresponds to the dimension between the first end surface 32 and the second end surface 33 of the magnetic body 30 in the axial direction X. The magnetic body dimension L3 is longer than the shortest distance L1 between the through holes 24 in the axial direction X, and shorter than the maximum distance L2 between the through holes 24 in the axial direction X.

As shown in FIG. 4, when the rotor 19 is viewed from the radial direction Y, the first peripheral edge 32a, which is the peripheral edge of the first end surface 32, overlaps the through holes 25 and 26. When the rotor 19 is viewed from the radial direction Y, a second peripheral edge portion 33a, which is a peripheral edge portion of the second end face 33, overlaps the through holes 25 and 26. In other words, the through hole 24 overlaps the peripheral edge of the magnetic body end surface 31 when viewed from the radial direction Y.

[Structure of shaft member]
As shown in FIG. 1, the rotor 19 includes two shaft members 40. One shaft member 40 is also referred to as a first shaft member 41, and the other shaft member 40 is also referred to as a second shaft member 51. The first shaft member 41 and the second shaft member 51 have a solid cylindrical shape. The outer diameters of the first shaft member 41 and the second shaft member 51 are the same dimensions as the inner diameter of the cylindrical member 20. The first shaft member 41 and the second shaft member 51 are made of, for example, a metal material.

The first shaft member 41 and the second shaft member 51 are press-fitted into the cylindrical member 20 . The first shaft member 41 has a first press-fit portion 43 that is press-fitted into the cylindrical member 20 and a first exposed portion 42 that is not press-fitted into the cylindrical member 20 . The second shaft member 51 has a second press-fitting portion 53 that is press-fitted into the cylindrical member 20 and a second exposed portion 52 that is not press-fitted into the cylindrical member 20 . The first press-fitting portion 43 is located further inside the cylindrical member 20 than the first opening 21 of the cylindrical member 20 in the axial direction X. The first exposed portion 42 is exposed to the outside of the cylindrical member 20 from the first opening 21 of the cylindrical member 20 in the axial direction X. The second press-fitting portion 53 is located further inside the cylindrical member 20 than the second opening 22 of the cylindrical member 20 in the axial direction X. The second exposed portion 52 is exposed to the outside of the cylindrical member 20 from the second opening 22 of the cylindrical member 20 in the axial direction X.

The axes of the first shaft member 41 and the second shaft member 51 coincide with the axes of the first boss portion 12c and the second boss portion 13c. That is, the axis of the shaft member 40 coincides with the axis L. The outer circumferential surface of the first exposed portion 42 is supported by a bearing 14 arranged on the inner circumferential surface of the first boss portion 12c. Thereby, the first shaft member 41 is rotatably supported with respect to the housing 11. The outer circumferential surface of the second exposed portion 52 is supported by a bearing 14 arranged on the inner circumferential surface of the second boss portion 13c. Thereby, the second shaft member 51 is rotatably supported with respect to the housing 11.

A first outer circumferential surface 43 a that is the outer circumferential surface of the first press-fitting part 43 and a second outer circumferential surface 53 a that is the outer circumferential surface of the second press-fitting part 53 are in close contact with the inner circumferential surface 20 a of the cylindrical member 20 . Thereby, the first shaft member 41 and the second shaft member 51 are fixed to the inner peripheral surface 20a of the cylinder member 20.

The first press-fitting part 43 and the second press-fitting part 53 are adjacent to the magnetic body 30 in the axial direction X. In other words, the shaft member 40 is adjacent to the magnetic body 30 in the axial direction X. The magnetic body 30 is sandwiched between the first press-fitting part 43 and the second press-fitting part 53 in the axial direction X.

By press-fitting the first shaft member 41 and the second shaft member 51 into the cylinder member 20, the first shaft member 41 and the second shaft member 51 rotate together with the cylinder member 20 and the magnetic body 30.
The second exposed portion 52 penetrates the second housing structure 13 and extends in the axial direction X between the inside of the housing 11 and the outside of the housing 11 . An impeller (not shown) that rotates integrally with the second shaft member 51 is disposed at an end of the second exposed portion 52 located outside the housing 11 . The rotation of the second shaft member 51 is transmitted to the impeller as a driving force, thereby rotationally driving the impeller.

As shown in FIGS. 2 and 3, the shaft member 40 has a shaft member end face 45 at the end in the axial direction X. As shown in FIGS. The shaft member end face 45 is located at the end adjacent to the magnetic body end face 31 among the ends of the first shaft member 41 and the second shaft member 51 in the axial direction X. The shaft member end face 45 of the first shaft member 41 is referred to as a first shaft member end face 46. The first shaft member end face 46 is an end face of the first press-fit portion 43 in the axial direction X. The first shaft member end surface 46 is adjacent to the first end surface 32 of the magnetic body 30 and is in surface contact with the first end surface 32 . The shaft member end face 45 of the second shaft member 51 is referred to as a second shaft member end face 47. The second shaft member end face 47 is an end face of the second press-fit portion 53 in the axial direction X. The second shaft member end face 47 is adjacent to the second end face 33 of the magnetic body 30 and is in surface contact with the second end face 33 .

As shown in FIG. 4, when the rotor 19 is viewed from the radial direction Y, the third peripheral edge 46a, which is the peripheral edge of the first shaft member end face 46, overlaps the through holes 25 and 26. When the rotor 19 is viewed from the radial direction Y, the fourth peripheral edge 47a, which is the peripheral edge of the second shaft member end face 47, overlaps the through holes 25 and 26. In other words, the through hole 24 overlaps the peripheral edge of the shaft member end surface 45 when viewed from the radial direction Y.

[Configuration of passage section]
As shown in FIG. 3, the passage portion 60 is located in at least one of the magnetic body end surface 31 and the shaft member end surface 45 that are adjacent to each other in the axial direction X. The passage portion 60 of this embodiment is located at the first end surface 32 of the magnetic body 30, the second end surface 33 of the magnetic body 30, the first shaft member end surface 46, and the second shaft member end surface 47. Hereinafter, the end surface having these passage portions 60 will also be referred to as a passage end surface 61. In other words, the passage end surface 61 of this embodiment corresponds to the first end surface 32 of the magnetic body 30, the second end surface 33 of the magnetic body 30, the first shaft member end surface 46, and the second shaft member end surface 47. The peripheral edges of the passage end surface 61 include a first peripheral edge 32a of the first end surface 32, a second peripheral edge 33a of the second end surface 33, a third peripheral edge 46a of the first shaft member end surface 46, and a second shaft member end surface 47. This corresponds to the fourth peripheral edge portion 47a.

As shown in FIGS. 3 and 5, the passage section 60 has a tapered side surface 62 located along the peripheral edge of the passage end surface 61. As shown in FIGS. The tapered side surface 62 is located over the entire circumference of each peripheral edge of the passage end surface 61. The tapered side surface 62 approaches the inner circumferential surface 20a of the cylindrical member 20 as it becomes farther away from the passage end surface 61 in the axial direction X.

The passage portion 60 includes a groove portion 63 located along a passage end surface 61. The groove portion 63 is recessed from the passage end surface 61 . The groove portion 63 extends in the radial direction Y. One end of the groove 63 in the radial direction Y is defined as a first end 63a, and the other end of the groove 63 in the radial direction Y is defined as a second end 63b. The groove portion 63 passes through the center of the passage end face 61 and extends between the peripheral edges of the passage end face 61, for example. The first end 63a and the second end 63b are connected to the peripheral edge of the passage end surface 61. The first end 63a and the second end 63b are connected to the tapered side surface 62.

As shown in FIG. 3, the tapered side surface 62 located on the first end surface 32 of the magnetic body 30 extends so as to connect the first end surface 32 and the outer peripheral surface 30a of the magnetic body 30. The tapered side surface 62 located on the second end surface 33 of the magnetic body 30 extends so as to connect the second end surface 33 and the outer peripheral surface 30a of the magnetic body 30. The tapered side surface 62 located on the first shaft member end surface 46 extends so as to connect the first shaft member end surface 46 and the first outer circumferential surface 43a of the first press-fitting part 43. The tapered side surface 62 located on the second shaft member end surface 47 extends so as to connect the second shaft member end surface 47 and the second outer peripheral surface 53a of the second press-fitting portion 53.

As shown in FIG. 2, the passage portions 60 of the passage end surfaces 61 that are adjacent in the axial direction X are adjacent to each other in the axial direction X. Specifically, in the first end surface 32 of the magnetic body 30 and the first shaft member end surface 46, the tapered side surfaces 62 are adjacent to each other in the axial direction X, and the groove portions 63 are adjacent to each other. The tapered side surfaces 62 of the second end surface 33 of the magnetic body 30 and the second shaft member end surface 47 are adjacent to each other in the axial direction X, and the groove portions 63 are adjacent to each other. In this embodiment, adjacent passage end surfaces 61 in the axial direction X are in surface contact with each other. Therefore, a space S is defined between adjacent tapered side surfaces 62 and between grooves 63 in the axial direction X.

By positioning the peripheral edge of the magnetic body end face 31 and the peripheral edge of the shaft member end face 45 so as to overlap with the through hole 24 when viewed from the radial direction Y, the passage portion 60 is connected to the outside of the cylindrical member 20 via the through hole 24. It's communicating. Specifically, the passage portion 60 located at the first end surface 32 of the magnetic body 30 and the first shaft member end surface 46 communicates with the outside of the cylindrical member 20 via the through holes 25 and 26 . A passage portion 60 located at the second end surface 33 of the magnetic body 30 and the second shaft member end surface 47 communicates with the outside of the cylindrical member 20 via the through holes 25 and 26 .

As shown in FIG. 5, among the two through holes 24, one through hole 25 is connected to the first end 63a of the groove 63, and the other through hole 26 is connected to the second end 63b of the groove 63. It is connected. The passage portion 60 allows air flowing in from outside the cylindrical member 20 through the through hole 25 to pass through the space S and then flow out toward the through hole 26 .

[Effect]
Next, the operation of the present embodiment will be described below along with a method for press-fitting the magnetic body 30 and the shaft member 40 into the cylindrical member 20 and a method for discharging lubricating oil from the cylindrical member 20.

[Method of press-fitting magnetic material and shaft member into cylindrical member]
As shown in FIG. 6, the magnetic body 30 and the shaft member 40 are assembled inside the cylindrical member 20 by press fitting. When press-fitting the shaft member 40 into the cylinder member 20, lubricating oil is applied onto the inner peripheral surface 20a of the cylinder member 20 in order to smoothly press-fit the shaft member 40 into the cylinder member 20. . Below, the case where the second shaft member 51, the magnetic body 30, and the first shaft member 41 are press-fitted into the cylindrical member 20 in this order will be described as an example.

First, the second shaft member 51 is press-fitted into the cylindrical member 20 . When press-fitting the second shaft member 51 into the cylindrical member 20 , the second press-fitting portion 53 is inserted into the second opening 22 of the cylindrical member 20 . The second press-fitting portion 53 is inserted into the cylindrical member 20 to a position where the fourth peripheral portion 47a of the second shaft member end face 47 faces the through holes 25 and 26 of the cylindrical member 20 in the radial direction Y.

Next, the magnetic body 30 is press-fitted into the cylindrical member 20. The magnetic body 30 is inserted into the cylindrical member 20 from the first opening 21 . When the press-fitting of the magnetic body 30 into the cylindrical member 20 is completed, each of the second peripheral edge 33a of the second end surface 33 and the first peripheral edge 32a of the first end surface 32 is inserted into the through hole 25 of the cylindrical member 20 in the radial direction Y. , 26.

Subsequently, the first shaft member 41 is press-fitted into the cylindrical member 20. The first shaft member 41 is inserted into the cylindrical member 20 from the first opening 21 of the cylindrical member 20 . The first shaft member 41 is inserted to a position where the third peripheral edge portion 46a of the first shaft member end face 46 faces the through holes 25 and 26 of the cylindrical member 20 in the radial direction Y.

As the magnetic body 30 is press-fitted into the cylindrical member 20, the magnetic body end face 31 approaches the second shaft member end face 47 in the axial direction X. At this time, in the cylindrical member 20, the lubricating oil is pushed out by the second shaft member end face 47 and the magnetic body end face 31, so that the lubricating oil is pushed out near the fourth peripheral edge 47a of the second shaft member end face 47 and around the peripheral edge of the magnetic body end face 31. Lubricating oil may remain nearby. Note that in FIG. 6, the flow of lubricating oil pushed out by the second shaft member end face 47 and the magnetic body end face 31 as the magnetic body 30 is press-fitted into the cylindrical member 20 is schematically shown by the two-dot chain arrow. There is.

When the first shaft member 41 is press-fitted into the cylindrical member 20, a flow of lubricating oil occurs in the same manner as described above. That is, the lubricating oil is pushed out by the first shaft member end face 46 and the magnetic body end face 31 that are close to each other, so that the lubricating oil is deposited near the third peripheral edge 46a of the first shaft member end face 46 and near the peripheral edge of the magnetic body end face 31. may remain.

As shown in FIG. 7, when the press-fitting of the magnetic body 30 and shaft member 40 into the cylindrical member 20 is completed, the second end surface 33 of the magnetic body 30 and the second shaft member end surface 47 are in surface contact. The passage portion 60 of the second end surface 33 and the second shaft member end surface 47 is in communication with the outside of the cylindrical member 20 via the through holes 25 and 26. The first shaft member end face 46 and the first end face 32 of the magnetic body 30 are in surface contact. The passage portion 60 of the first end surface 32 and the first shaft member end surface 46 is in communication with the outside of the cylindrical member 20 via the through holes 25 and 26.

[How to drain lubricating oil from the cylinder member]
As shown in FIGS. 7 and 8, after the magnetic body 30 and shaft member 40 are press-fitted into the cylindrical member 20, the lubricating oil is discharged from the cylindrical member 20. When discharging lubricating oil, air is introduced into the interior of the cylindrical member 20 from the introduction nozzle 70 through the through hole 25 . At the same time, air is sucked from inside the cylindrical member 20 by the suction nozzle 71 through the through hole 26 .

Note that in order to ensure the rigidity of the cylindrical member 20, it is preferable to form the through holes 25 and 26 in the cylindrical member 20 with the smallest possible dimensions. The dimensions of the through hole 25 in the cylindrical member 20 are set to the minimum size that allows air to be introduced into the interior of the cylindrical member 20. The dimensions of the through hole 26 in the cylindrical member 20 are set to the minimum size that allows air to be discharged to the outside of the cylindrical member 20.

The through hole 25 into which air is introduced from the introduction nozzle 70 functions as an air introduction hole used to introduce air into the interior of the cylindrical member 20 . The through hole 26 through which air is sucked from the suction nozzle 71 functions as an air exhaust hole used to exhaust air from inside the cylindrical member 20.

In FIGS. 7 and 8, the air flow is indicated by a chain double-dashed arrow. In FIG. 8, the lubricating oil remaining inside the cylindrical member 20 is illustrated as lubricating oil G. Air introduced into the cylindrical member 20 through the through hole 25 is introduced into a passage portion 60 that communicates with the through hole 25 . The air introduced into the passage section 60 passes through the passage section 60. Specifically, in the first shaft member end surface 46 and the first end surface 32 of the magnetic body 30, air passes through a space S formed between the tapered side surfaces 62 and a space S formed between the grooves 63. do. In the second shaft member end surface 47 and the second end surface 33 of the magnetic body 30, air passes through a space S formed by the tapered side surfaces 62 and a space S formed by the groove portions 63, respectively. The air that has passed through the passage section 60 is discharged from the through hole 26.

Air flowing through the space S formed by the tapered side surface 62 flows along the peripheral edge of the shaft member end surface 45 and the peripheral edge of the magnetic body end surface 31. The lubricating oil G remains inside the cylindrical member 20 near the periphery of the shaft member end face 45 and near the periphery of the magnetic body end face 31 . Therefore, by flowing air into the space S formed by the tapered side surface 62, the lubricating oil G can flow together with the air.

The groove portion 63 extends linearly in the radial direction Y between the through hole 25 and the through hole 26. Therefore, the groove portion 63 connects the through hole 25 and the through hole 26 at a distance shorter than the tapered side surface 62. Air introduced into the cylindrical member 20 from the through hole 25 quickly flows into the through hole 26 via the space S formed by the groove 63. The groove portion 63 is connected to the peripheral edge of the shaft member end face 45 and the peripheral edge of the magnetic body end face 31 . Since the lubricating oil G remains near these peripheral portions, by flowing air into the space S formed by the groove portion 63, the lubricating oil G can flow together with the air.

The lubricating oil G remaining near the peripheral edge of the shaft member end face 45 and near the peripheral edge of the magnetic body end face 31 is sucked by the air flow through the passage portion 60. Thereby, the lubricating oil is discharged to the outside of the cylindrical member 20 along with the air through the through hole 26.

The introduction of air from the introduction nozzle 70 into the cylindrical member 20 and the suction of air from the suction nozzle 71 to the outside of the cylindrical member 20 are stopped after being continued for a predetermined period of time. Note that the above-mentioned predetermined time period during which air is introduced into and sucked into the cylindrical member 20 is a time during which the lubricating oil remaining inside the cylindrical member 20 can be discharged to the outside of the cylindrical member 20 via the through hole 26. is set to .

According to the above embodiment, the following effects can be obtained.
(1) The rotor 19 communicates with the outside of the cylindrical member 20 through the through holes 25 and 26 that pass through the cylindrical member 20, and the passage located in the magnetic body end face 31 and the shaft member end face 45 that are adjacent in the axial direction It has a section 60. Therefore, by introducing air into the cylindrical member 20 through the through hole 25, air can be introduced into the passage portion 60. The air introduced into the passage section 60 is discharged from the through hole 26 after passing through the passage section 60. Even if lubricating oil remains inside the cylindrical member 20, the lubricating oil is sucked by the air flow through the passage section 60, so that the lubricating oil is discharged to the outside of the cylindrical member 20 along with the air through the through hole 26. be done. Therefore, the lubricating oil remaining in the cylindrical member 20 can be reduced.

(2) A plurality of through holes 24 are arranged at different positions of the cylindrical member 20. Therefore, the through hole 25 can be used as an air introduction hole for introducing air into the cylindrical member 20, and the through hole 26 can be used as an air exhaust hole for discharging air from inside the cylindrical member 20. Therefore, compared to the case where one through hole 24 functions as both an air introduction hole and an air discharge hole, air can be introduced into the cylindrical member 20 and air can be discharged from the cylindrical member 20 through the passage section 60. and can be carried out smoothly. Therefore, the lubricating oil remaining in the cylindrical member 20 can be further reduced.

(3) When a virtual plane perpendicular to the radial direction Y at a position including the axis L of the cylindrical member 20 is assumed to be a virtual plane P, the through hole 24 is formed in the cylinder so that it has plane symmetry with the virtual plane P as a plane of symmetry. It is arranged on the member 20. Therefore, it is possible to suppress the occurrence of unbalanced rotation of the rotor 19 due to the formation of the through hole 24 in the cylindrical member 20.

(4) The through hole 25 can be used as an air introduction hole for introducing air into the cylindrical member 20, and the through hole 26 can be used as an air exhaust hole for discharging air from the inside of the cylindrical member 20. The through hole 25 is connected to the first end 63a of the groove 63, and the through hole 26 is connected to the second end 63b of the groove 63. Therefore, air is introduced into the first end 63a from outside the cylindrical member 20 through the through hole 25. Air flows from the first end 63a of the groove 63 to the second end 63b. The air that has passed through the groove 63 is discharged from the second end 63b to the outside of the cylindrical member 20 via the through hole 26. Therefore, air can be smoothly introduced into the cylindrical member 20 via the passage portion 60 and air can be discharged from the cylindrical member 20, so that the amount of lubricating oil remaining in the cylindrical member 20 can be further reduced.

(5) When the magnetic body 30 is inserted into the cylindrical member 20, it is inserted into the cylindrical member 20 from the second end surface 33 of the magnetic body 30. When the first shaft member 41 is inserted into the cylinder member 20, it is inserted into the cylinder member 20 from the first shaft member end face 46. When the second shaft member 51 is inserted into the cylinder member 20, it is inserted into the cylinder member 20 from the second shaft member end face 47. According to the above embodiment, when the magnetic body 30 and the shaft member 40 are inserted into the cylindrical member 20, the tapered side surfaces 62 are located at each end surface that is first inserted into the cylindrical member 20. Therefore, it is possible to suppress the magnetic body 30 and the shaft member 40 from being scraped when inserted into the cylindrical member 20.

Note that the above embodiment can be modified and implemented as follows. The above embodiment and the following modification examples can be implemented in combination with each other within a technically consistent range.

○ The groove portion 63 is not limited to extending linearly in the radial direction Y. For example, the groove portion 63 may extend in a curved shape on the passage end surface 61.
○ One or both of the first end 63a and the second end 63b of the groove 63 may not be connected to the through hole 24. In this case, one or both of the first end 63a and the second end 63b are connected to the space S formed by the tapered side surface 62, so that the groove 63 is connected to the through hole 24 via this space S. Therefore, air can flow from the through hole 24 to the groove portion 63. Air can be discharged from the groove 63 to the through hole 24.

○ As shown in FIGS. 9 and 10, the passage section 60 does not need to have the groove section 63. In the passage section 60 that does not have the groove section 63 , air flowing from outside the cylindrical member 20 through the through hole 25 passes over the tapered side surface 62 and then flows out toward the through hole 26 . In addition, in FIG. 9, all of the passage portions 60 located at the first shaft member end surface 46, the second shaft member end surface 47, the first end surface 32 of the magnetic body 30, and the second end surface 33 of the magnetic body 30 are grooved. The rotor 19 is illustrated as a passage portion 60 that does not have a passage 63. The passage section 60 without the groove section 63 is located at the first shaft member end surface 46 , the second shaft member end surface 47 , the first end surface 32 of the magnetic body 30 , and the second end surface 33 of the magnetic body 30 . It may be a part of it.

○ The passage portion 60 does not need to have the tapered side surface 62. The passage section 60 without the tapered side surface 62 is located at the first shaft member end surface 46 , the second shaft member end surface 47 , the first end surface 32 of the magnetic body 30 , and the second end surface 33 of the magnetic body 30 . It may be a part or all of them. For example, when the passage portion 60 without the tapered side surface 62 is located in the magnetic body 30, both ends of the groove portion 63 in the radial direction Y are connected to the outer circumferential surface 30a of the magnetic body 30. One end of the groove portion 63 in the radial direction Y communicates with the through hole 25 . The other end of the groove portion 63 in the radial direction Y communicates with the through hole 26 . In the passage section 60 , air that has flowed in from outside the cylindrical member 20 through the through hole 25 passes through the groove section 63 and then flows out toward the through hole 26 .

The passage portion 60 located on the first end surface 32 of the magnetic body 30 and the first shaft member end surface 46 may communicate with the outside of the cylindrical member 20 via three or more through holes 24. The three or more through holes 24 in this case overlap with the first peripheral edge 32a of the first end surface 32 and the third peripheral edge 46a of the first shaft member end surface 46 when viewed from the radial direction Y. The passage portion 60 located at the second end surface 33 of the magnetic body 30 and the second shaft member end surface 47 may communicate with the outside of the cylindrical member 20 via three or more through holes 24 . The three or more through holes 24 in this case overlap with the second peripheral edge 33a of the second end surface 33 and the fourth peripheral edge 47a of the second shaft member end surface 47 when viewed from the radial direction Y.

The arrangement position of the through hole 24 in the cylindrical member 20 is not limited to the arrangement position that is plane symmetrical with respect to the virtual plane P as the plane of symmetry. In this case, if the shape of the cylindrical member 20 is adjusted, such as by partially reducing the thickness of the cylindrical member 20 depending on the position of the through hole 24, the rotor 19 may be It is possible to suppress the occurrence of rotational imbalance.

As shown in FIG. 11, the passage portion 60 located on the first end surface 32 of the magnetic body 30 may communicate with only one through hole 24. Although not shown, some of the passages 60 located on the second end surface 33 of the magnetic body 30, the first shaft member end surface 46, and the second shaft member end surface 47 are The passage portions 60 may communicate with only one through hole 24 , or all the passage portions 60 may communicate with one through hole 24 . In short, the through hole 24 may be formed in the cylindrical member 20 at one location that overlaps the peripheral edge of the magnetic body end face 31 and the peripheral edge of the shaft member end face 45 when viewed from the radial direction Y. When the passage portion 60 communicates with only one through hole 24 , for example, if air is introduced from the through hole 24 by the introduction nozzle 70 and air is discharged from the same through hole 24 , the lubrication from the through hole 24 can be improved. Can drain oil.

○ As shown in FIG. 12, a plurality of magnetic bodies 30 may be adjacent to each other in the axial direction X. In FIG. 12, a rotor 19 in which two magnetic bodies 30 are adjacent in the axial direction X is illustrated. The configuration of the rotor 19 shown in FIG. 12 will be described below.

As shown in FIG. 12, one of the two magnetic bodies 30 is referred to as a first magnetic body 130, and the magnetic body 30 adjacent to the first magnetic body 130 in the axial direction X is referred to as a second magnetic body 131. . The first magnetic body 130 and the second magnetic body 131 are press-fitted into the cylindrical member 20. The through holes 25 and 26 correspond to first through holes. The passage section 60 corresponds to a first passage section. The first magnetic body 130 has a first magnetic body end face 132 at an end in the axial direction X. The second magnetic body 131 has a second magnetic body end face 133 adjacent to the first magnetic body end face 132 at an end in the axial direction X.

The rotor 19 has a second passage section 160. The second passage portion 160 communicates with the outside of the cylindrical member 20 via the second through hole 124 that penetrates the cylindrical member 20 . The second passage portion 160 is located at the first magnetic body end face 132 and the second magnetic body end face 133. Note that the second passage portion 160 may be located on either one of the first magnetic body end face 132 and the second magnetic body end face 133.

The second passage section 160 has a tapered side surface 62. The tapered side surface 62 of this form is located along the peripheral edge of the first magnetic body end face 132 and the peripheral edge of the second magnetic body end face 133. Note that the second passage section 160 may have a groove similar to the groove 63 of the above embodiment.

Two second through holes 124 are arranged in the cylindrical member 20 . The two second through holes 124 overlap the peripheral edge of the first magnetic body end face 132 and the peripheral edge of the second magnetic body end face 133 when viewed from the radial direction Y.

One of the second through holes 124 is also referred to as a second through hole 125, and the other second through hole 124 is also referred to as a second through hole 126. The second through hole 125 functions as an air introduction hole that can introduce air into the cylindrical member 20 by introducing air from the introduction nozzle 70 . The second through hole 126 functions as an air discharge hole that can discharge air by suctioning the air with the suction nozzle 71 . The second passage portion 160 is capable of allowing air that has flowed in from outside the cylindrical member 20 through the second through hole 125 to flow out toward the second through hole 126 .

According to the above modification, the following effects can be obtained in addition to the effects of the above embodiment.
(6) When the first magnetic body 130 and the second magnetic body 131 are press-fitted into the cylindrical member 20, lubricating oil remains near the periphery of the first magnetic body end face 132 and near the periphery of the second magnetic body end face 133. There are things to do. According to the above modification, such lubricating oil is sucked by the air flow through the second passage section 160. Thereby, the lubricating oil is discharged to the outside of the cylindrical member 20 along with the air through the second through hole 126. Therefore, the lubricating oil remaining in the cylindrical member 20 can be further reduced.

- The first shaft member end surface 46 and the first end surface 32 of the magnetic body 30 may not be in surface contact but may be spaced apart from each other. The second shaft member end surface 47 and the second end surface 33 of the magnetic body 30 may not be in surface contact but may be spaced apart from each other.

The magnetic body 30 may be press-fitted into the cylindrical member 20 before the first shaft member 41 and the second shaft member 51 are inserted.
The method of assembling the magnetic body 30 to the cylindrical member 20 may be other than press-fitting into the cylindrical member 20, such as fixing with adhesive, for example.

○ The magnetic body 30 is not limited to a permanent magnet. For example, the magnetic body 30 may be a laminated core, an amorphous core, a powder core, or the like.
The rotating electric machine 10 may have a configuration in which an impeller is attached to the end of the first shaft member 41 in addition to the end of the second shaft member 51. In this case, the impeller attached to the first shaft member 41 can rotate integrally with the first shaft member 41. The impeller is driven by the rotation of the first shaft member 41 being transmitted as driving force.

L... Axis line, P... Virtual plane, X... Axial direction, Y... Radial direction, 10... Rotating electric machine, 19... Rotor, 20... Cylindrical member, 20a... Inner peripheral surface, 24, 25, 26... Through hole, 30... Magnetic body, 31...Magnetic body end face, 32...First end face, 32a...First peripheral edge part, 33... Second end face, 33a... Second peripheral edge part, 40... Shaft member, 41... First shaft member, 45... Shaft Member end face, 46... First shaft member end face, 46a... Third peripheral edge, 47... Second shaft member end face, 47a... Fourth peripheral edge, 60... Passage part, 61... Passage end face, 62... Tapered side surface, 63... Groove portion, 63a...first end, 63b...second end, 130...first magnetic body, 131...second magnetic body, 132...first magnetic body end surface, 133...second magnetic body end surface, 124, 125, 126...Second through hole, 160...Second passage portion.

Claims (7)

A cylindrical member,
a magnetic body disposed within the cylindrical member;
A rotor for a rotating electrical machine, comprising: a shaft member press-fitted into the cylindrical member and adjacent to the magnetic body in the axial direction of the cylindrical member;
The magnetic body has a magnetic body end face at an end in the axial direction,
The shaft member has a shaft member end face adjacent to the magnetic body end face at an end in the axial direction,
The rotor communicates with the outside of the cylindrical member via a through hole that penetrates the cylindrical member, and has a passage portion located on at least one of the magnetic body end face and the shaft member end face that are adjacent in the axial direction. death,
The through hole overlaps an edge of the magnetic body end surface and an edge of the shaft member end surface when viewed from a direction perpendicular to the axis of the cylindrical member,
A rotor for a rotating electrical machine, wherein the passage portion is capable of allowing air that has flowed in from outside the cylindrical member through the through hole to flow out toward the through hole. The rotor for a rotating electrical machine according to claim 1, wherein a plurality of the through holes are arranged at different positions of the cylindrical member. When a virtual plane orthogonal to the orthogonal direction at a position including the axis of the cylindrical member is defined as a virtual plane,
The rotor for a rotating electrical machine according to claim 2, wherein the through hole is arranged in the cylindrical member so as to be plane symmetrical with respect to the virtual plane. When the end face having the passage portion is defined as the passage end face among the magnetic body end face and the shaft member end face,
The rotor of a rotating electric machine according to any one of claims 1 to 3, wherein the passage portion includes a groove portion located along the end surface of the passage. The groove extends in the orthogonal direction,
When one end of the groove in the orthogonal direction is a first end, and the other end of the groove in the orthogonal direction is a second end,
The first end and the second end are connected to an edge of the passage end surface,
Two or more of the through holes are arranged at different positions of the cylindrical member,
A rotor for a rotating electrical machine according to claim 4, wherein one of the two through holes is connected to the first end, and the other through hole is connected to the second end. . When the end face having the passage portion is defined as the passage end face among the magnetic body end face and the shaft member end face,
The passage portion has a tapered side surface that is located along an edge of the passage end face and approaches the inner surface of the cylindrical member as it becomes farther away from the passage end face in the axial direction. The rotor of the rotating electric machine according to item (1). A plurality of the magnetic bodies are adjacent to each other in the axial direction,
Among the plurality of magnetic bodies, one of the magnetic bodies is a first magnetic body, the magnetic body adjacent to the first magnetic body in the axial direction is a second magnetic body, and the through hole is a first through hole. and when the passage section is a first passage section,
The first magnetic body has a first magnetic body end face at an end in the axial direction,
The second magnetic body has a second magnetic body end face adjacent to the first magnetic body end face at an end in the axial direction,
The rotor communicates with the outside of the cylindrical member via a second through hole that passes through the cylindrical member, and includes a second passage portion located on at least one of the first magnetic material end surface and the second magnetic material end surface. has
The second through hole overlaps an edge of the first magnetic body end face and an edge of the second magnetic body end face when viewed from the orthogonal direction,
According to any one of claims 1 to 6, the second passage portion is capable of allowing air that has flowed in from outside the cylindrical member through the second through hole to flow out toward the second through hole. Rotor of the mentioned rotating electric machine.