WO2023171696A1 - Rotary electric machine - Google Patents

Abstract

A rotary electric machine according to the present invention comprises: a rotatable shaft; a rotor; a stator; a plurality of bearing members that support the shaft; a housing that stores the shaft, the rotor, and the stator; and a first fixation member fixed to the housing. The housing has a cylindrical part having a first opening that is open toward one axial side, and a first lid member that closes the first opening. The stator has a first hole that is open toward one axial side, and is fixed to the cylindrical part. The bearing members are held on the first lid member. The first lid member has a first through-hole. The first fixation member has: a first body part that extends in the axial direction to be inserted into the first through-hole and that partially comes into contact with the inner circumferential surface of the first hole; and a first large diameter part positioned on one axial side of the first lid member. A first taper part is provided to the inner circumferential surface of the first through-hole. A second taper part is provided to the outer circumferential surface of the first large diameter part. The first taper part and the second taper part come into contact with each other.

Description

rotating electric machine

The present invention relates to a rotating electrical machine.

This application is based on Japanese Patent Application No. 2022-035307 filed on March 8, 2022. This application claims priority over that application. The entire contents are incorporated into this application by reference.

A rotating electrical machine that includes a rotor and a stator is known. For example, Patent Document 1 discloses an electric motor having a structure in which a stator is fixed to a cylindrical part, and a lid part that holds a bearing that supports a rotor is fixed to an end of the cylindrical part in the central axis direction. is listed.

Special table 2017-502641 publication

In the electric motor having the structure described above, if the position of the lid section deviates from the cylindrical section in the radial direction, the position of the rotational axis of the rotor and the position of the central axis of the stator deviate from each other. If the electric motor is driven in a state where the position of the rotating shaft of the rotor and the position of the central axis of the stator are misaligned in the radial direction, vibration and noise may be generated.

In view of the above circumstances, one aspect of the present invention has an object to provide a rotating electric machine that can suppress misalignment between the position of the rotating shaft of the rotor and the position of the central axis of the stator.

One aspect of the rotating electric machine of the present invention includes a shaft rotatable about a central axis, a rotor fixed to the shaft, a stator located radially outside the rotor, and a plurality of rotary electric machines supporting the shaft. A bearing member, a housing that accommodates at least a portion of the shaft, the rotor, and the stator therein, and a first fixing member fixed to the housing. The housing has a first opening that opens on one side in the axial direction, and closes the first opening and a cylindrical part that surrounds at least a portion of the shaft, the rotor, and the stator from the outside in the radial direction. A first lid member. The stator has a first hole opening on one side in the axial direction, and is fixed to the cylindrical part. At least one of the bearing members is held by the first lid member. The first lid member has a first through hole that axially passes through the first lid member. The first fixing member includes a first main body portion that extends in the axial direction and is passed through the first through hole, and at least a portion of the first fixing member is inserted into the first hole portion and comes into contact with an inner circumferential surface of the first hole portion. and a first large diameter portion connected to the first main body portion and located on one side in the axial direction of the first lid member. A first tapered portion is provided on the inner circumferential surface of the first through hole, the inner diameter of which decreases toward the other side in the axial direction. A second tapered portion whose outer diameter decreases toward the other axial side is provided on the outer peripheral surface of the first large diameter portion. The first tapered portion and the second tapered portion are in contact with each other.

According to one aspect of the present invention, in a rotating electric machine, it is possible to suppress misalignment between the position of the rotating shaft of the rotor and the position of the central axis of the stator.

FIG. 1 is a perspective view showing a rotating electrical machine according to a first embodiment. FIG. 2 is a sectional view showing the rotating electrical machine of the first embodiment. FIG. 3 is a sectional view showing a portion of the rotating electric machine of the first embodiment. FIG. 4 is a sectional view showing other parts of the rotating electric machine of the first embodiment. FIG. 5 is a sectional view showing a rotating electric machine according to a second embodiment. FIG. 6 is a sectional view showing a portion of a modification of the rotating electrical machine of the first embodiment.

Hereinafter, a rotating electrical machine 1 according to an embodiment of the present invention will be described with reference to the drawings. Note that the scope of the present invention is not limited to the following embodiments, and can be arbitrarily modified within the scope of the technical idea of the present invention. Further, in the following drawings, in order to make each structure easier to understand, the scale, number, etc. of each structure may be different from the actual structure.

In the following description, the Z axis is shown in the figures as appropriate. The Z-axis indicates the direction in which the central axis J of the rotating electrical machine 1 of the embodiment described below extends. The central axis J shown in each figure is a virtual axis. In the following description, the direction in which the central axis J extends, that is, the direction parallel to the Z-axis, will be referred to as the "axial direction." The radial direction centered on the central axis J is simply referred to as the "radial direction." The circumferential direction centered on the central axis J is simply referred to as the "circumferential direction." In the axial direction, the side toward which the Z-axis arrow points (+Z side) is referred to as "one axial side" or "upper side." In the axial direction, the side opposite to the direction of the Z-axis arrow (-Z side) is called the "other axial side" or the "lower side." Note that the terms "upper side" and "lower side" are simply names used to explain the relative positional relationships of the respective parts, and the actual arrangement relationships may be other than those indicated by these names.

<First embodiment>
A rotating electrical machine 1 according to the present embodiment shown in FIG. 1 is a motor that is attached to equipment mounted on a vehicle. The device to which the rotating electric machine 1 is attached may be an automatic transmission or a drive device that drives an axle of a vehicle. As shown in FIG. 2, the rotating electric machine 1 includes a housing 10, a rotor 20, a shaft 23, a stator 30, a first bearing member 91, a second bearing member 92, a first fixing member 61, and a first fixing member 61. 2 fixing member 65.

The housing 10 houses therein the rotor 20, a portion of the shaft 23, the stator 30, the first bearing member 91, the second bearing member 92, a portion of the first fixing member 61, and a portion of the second fixing member 65. are doing. The housing 10 includes a cylindrical portion 11, a first lid member 12, and a second lid member 13.

As shown in FIG. 2, the cylindrical portion 11 has a cylindrical shape that extends in the axial direction centering on the central axis J. The cylindrical portion 11 surrounds a portion of the shaft 23, the rotor 20, and the stator 30 from the outside in the radial direction. The cylindrical portion 11 has a first opening 11a that opens on the upper side, that is, one side in the axial direction, and a second opening 11b that opens on the lower side, that is, the other side in the axial direction.

The first lid member 12 has a substantially disk shape centered on the central axis J. The plate surface of the first lid member 12 faces in the axial direction. The first lid member 12 is fixed to the upper end of the cylindrical portion 11 . The first lid member 12 closes the first opening 11a from above. The first lid member 12 has a first lid main body portion 12a and a first bearing holding portion 12e.

The first lid main body portion 12a has a substantially disk shape centered on the central axis J. The plate surface of the first lid main body portion 12a faces in the axial direction. The outer edge of the downwardly facing surface of the first lid main body portion 12a is in contact with the upwardly facing surface of the cylindrical portion 11. The first lid main body portion 12a has a first through hole 12b and a small diameter portion 12d.

The first through hole 12b is a hole that passes through the first lid main body portion 12a in the axial direction. The first through hole 12b has a circular shape when viewed in the axial direction. As shown in FIG. 3, a first tapered portion 12c whose inner diameter decreases toward the lower side, that is, toward the other axial side, is provided on the upper portion of the inner peripheral surface of the first through hole 12b. . The upper end of the first tapered portion 12c is connected to the upwardly facing surface of the first lid main body portion 12a. The inner diameter of a portion of the inner peripheral surface of the first through hole 12b below the first tapered portion 12c is the same as the inner diameter of the lower end of the first tapered portion 12c. As shown in FIG. 1, a plurality of first through holes 12b are provided at intervals along the circumferential direction. In this embodiment, four first through holes 12b are provided.

As shown in FIG. 3, the small diameter portion 12d is recessed radially inward from the outer peripheral surface of the first lid main body portion 12a. The small diameter portion 12d is provided all around the outer peripheral surface of the first lid main body portion 12a. A first outer surface 12d1, which is a surface facing downward among the outer surfaces of the small diameter portion 12d, is in contact with the upper end of the cylindrical portion 11. A second outer surface 12d2, which is a surface facing radially outward among the outer surfaces of the small diameter portion 12d, faces the inner circumferential surface of the cylindrical portion 11 with a first interval G1 in the radial direction. Therefore, when fixing the first lid member 12 to the cylindrical part 11, the first outer surface 12d1 and the upper end of the cylindrical part 11 can be easily brought into contact. Therefore, it is possible to suppress an increase in the number of manufacturing steps for the rotating electric machine 1.

As shown in FIG. 2, the first bearing holding portion 12e has an annular shape centered on the central axis J. The first bearing member 91 is held on the inner circumferential surface of the first bearing holding portion 12e that protrudes downward from the first lid main body portion 12a. That is, the first lid member 12 holds the first bearing member 91.

As shown in FIG. 2, the second lid member 13 has a substantially annular plate shape centered on the central axis J. The plate surface of the second lid member 13 faces in the axial direction. The second lid member 13 is fixed to the lower end of the cylindrical portion 11. The second lid member 13 closes the second opening 11b from below. The second lid member 13 includes a second lid main body portion 13a, a protruding portion 13d, and a second bearing holding portion 13e.

The second lid main body portion 13a has a substantially disk shape centered on the central axis J. The plate surface of the second lid main body portion 13a faces in the axial direction. The outer edge of the upper side of the second lid body 13a is in contact with the lower side of the cylindrical part 11. The second lid main body portion 13a has a second through hole 13b and a hole portion 13g.

The second through hole 13b is a hole that passes through the second lid main body portion 13a in the axial direction. The second through hole 13b has a circular shape when viewed in the axial direction. As shown in FIG. 4, a third tapered portion 13c whose inner diameter decreases toward the upper side, that is, toward one side in the axial direction, is provided on the lower portion of the inner circumferential surface of the second through hole 13b. . The lower end of the third tapered portion 13c is connected to the downwardly facing surface of the second lid main body portion 13a. The inner diameter of a portion of the inner circumferential surface of the second through hole 13b above the third tapered portion 13c is the same as the inner diameter of the upper end of the third tapered portion 13c. A plurality of second through holes 13b are provided at intervals along the circumferential direction. In this embodiment, four second through holes 13b are provided. In this embodiment, each second through hole 13b overlaps with the first through hole 12b when viewed in the axial direction. Note that, when viewed in the axial direction, each of the second through holes 13b does not need to overlap with the first through hole 12b.

As shown in FIG. 2, the hole 13g is a hole that passes through the second lid main body 13a in the axial direction. The hole 13g is a circular hole centered on the central axis J.

As shown in FIG. 4, the protrusion 13d has an annular shape centered on the central axis J. The protruding portion 13d protrudes upward from the outer edge of the upwardly facing surface of the second lid main body portion 13a. A first outer circumferential surface 13d1, which is an outer circumferential surface of the protruding portion 13d, faces the inner circumferential surface of the cylindrical portion 11 with a second interval G2 in the radial direction. Therefore, when fixing the second lid member 13 to the cylindrical part 11, it is possible to easily bring the upper side of the second lid main body part 13a into contact with the lower end of the cylindrical part 11. can. Therefore, it is possible to suppress an increase in the number of manufacturing steps for the rotating electric machine 1.

As shown in FIG. 2, the second bearing holding portion 13e has an annular shape centered on the central axis J. The second bearing holding portion 13e protrudes upward from the upper side of the second lid main body portion 13a. A second bearing member 92 is held on the inner peripheral surface of the second bearing holding portion 13e. That is, the second lid member 13 holds the second bearing member 92.

The rotor 20 is rotatable around the central axis J. The rotor 20 includes a rotor core 21 and a plurality of magnets (not shown). As shown in FIG. 2, the rotor core 21 has a cylindrical shape that extends in the axial direction about the central axis J. A shaft 23 is passed through the rotor core 21 in the axial direction. The inner peripheral surface of the rotor core 21 is fixed to the outer peripheral surface of the shaft 23. That is, the rotor core 21 is fixed to the shaft 23. A plurality of magnets (not shown) are fixed to the rotor core 21. The plurality of magnets are arranged at intervals along the circumferential direction.

The shaft 23 has a cylindrical shape that extends in the axial direction centering on the central axis J. The upper portion of the shaft 23 protrudes above the rotor core 21 and is rotatably supported by the first bearing member 91. A lower portion of the shaft 23 protrudes below the rotor core 21 and is rotatably supported by the second bearing member 92 . Due to these, the shaft 23 is rotatable around the central axis J. Therefore, the rotor 20 fixed to the shaft 23 is also rotatable around the central axis J. A portion of the shaft 23 below the second bearing member 92 passes through the hole 13g in the axial direction and projects to the outside of the housing 10.

As shown in FIG. 2, the first bearing member 91 and the second bearing member 92 are a plurality of bearing members that support the shaft 23. The first bearing member 91 is held by the first bearing holding portion 12e. The first bearing member 91 rotatably supports a portion of the shaft 23 above the rotor core 21 . The second bearing member 92 is held by the second bearing holding portion 13e. The second bearing member 92 rotatably supports a portion of the shaft 23 below the rotor core 21. In this embodiment, the first bearing member 91 and the second bearing member 92 are ball bearings. The first bearing member 91 and the second bearing member 92 may be rolling bearings other than ball bearings, or may be sliding bearings.

As shown in FIG. 2, the stator 30 is located outside the rotor 20 in the radial direction. The stator 30 faces the rotor 20 in the radial direction with a gap therebetween. The stator 30 includes a stator core 31, an insulator (not shown), and a coil 32.

The stator core 31 has a cylindrical shape that extends in the axial direction centering on the central axis J. Stator core 31 surrounds rotor 20 from the outside in the radial direction. Stator core 31 faces rotor core 21 in the radial direction with a gap therebetween. The outer peripheral surface of the stator core 31 is fixed to the inner peripheral surface of the cylindrical portion 11. Stator core 31 has a core back portion 31d and teeth portions 31e. The core back portion 31d has a cylindrical shape that extends in the axial direction centering on the central axis J. The outer peripheral surface of the core back portion 31d is fixed to the inner peripheral surface of the cylindrical portion 11. The teeth portion 31e protrudes radially inward from the core back portion 31d. Although not shown, the teeth portion 31e has a substantially rectangular shape when viewed in the axial direction. In this embodiment, a plurality of teeth portions 31e are provided at intervals along the circumferential direction. At least a portion of each tooth portion 31e is covered with an insulator. A coil 32 is wound around each tooth portion 31e via an insulator. Stator core 31 has a first hole 31a and a second hole 31b.

As shown in FIG. 2, the first hole portion 31a is a hole recessed downward from the upwardly facing surface of the core back portion 31d. That is, the stator 30 has a first hole 31a that opens on the upper side, that is, on one side in the axial direction. The first hole 31a has a circular shape when viewed in the axial direction. A plurality of first holes 31a are provided at intervals along the circumferential direction. In this embodiment, four first holes 31a are provided. When viewed in the axial direction, each first hole portion 31a overlaps with the first through hole 12b, respectively.

The second hole portion 31b is a hole recessed upward from the downwardly facing surface of the core back portion 31d. That is, the stator 30 has a second hole 31b that opens on the lower side, that is, on the other axial side. The second hole portion 31b has a circular shape when viewed in the axial direction. A plurality of second holes 31b are provided at intervals along the circumferential direction. In this embodiment, four second holes 31b are provided. When viewed in the axial direction, each second hole 31b overlaps with the second through hole 13b and the first hole 31a, respectively. Moreover, in this embodiment, the first hole 31a and the second hole 31b are connected to each other in the axial direction. Therefore, according to the present embodiment, the first hole portion 31a and the second hole portion 31b can be provided at the same time by one machining operation for forming a hole that axially penetrates the stator core 31 using a drill or the like. Therefore, compared to the case where the first hole part 31a and the second hole part 31b are not connected in the axial direction, that is, the case where the first hole part 31a and the second hole part 31b are each provided by separate machining operations. , the number of manufacturing steps for the stator core 31 can be reduced.

As shown in FIG. 2, the first fixing member 61 has a substantially cylindrical shape extending in the axial direction. The upper end of the first fixing member 61 is located above the first lid member 12. The lower end of the first fixing member 61 is located inside the first hole 31a. In this embodiment, four first fixing members 61 are provided. Each first fixing member 61 has a first main body portion 62 and a first large diameter portion 63. The first main body portion 62 has a substantially cylindrical shape extending in the axial direction. The first main body portion 62 includes a first fixing portion 62a, a first extending portion 62b, and a first male screw portion 62d.

The first fixing portion 62a has a cylindrical shape extending in the axial direction. The first fixing portion 62a is a lower portion of the first main body portion 62. The first fixing portion 62a is inserted into the first hole 31a. In this embodiment, the upper end of the first fixing portion 62a is disposed at approximately the same position as the upper end of the stator core 31 in the axial direction. Note that, in the axial direction, the upper end of the first fixing portion 62a may not be located at substantially the same position as the upper end of the stator core 31. The outer peripheral surface of the first fixing portion 62a is in contact with the inner peripheral surface of the first hole 31a. That is, at least a portion of the first main body portion 62 is inserted into the first hole portion 31a and is in contact with the inner circumferential surface of the first hole portion 31a. Further, in this embodiment, the first fixing portion 62a and the first hole portion 31a are fitted into each other. In this embodiment, the first fixing portion 62a is press-fitted into the first hole 31a and fitted into the first hole 31a. Thereby, the first fixing member 61 and the stator 30 are fixed to each other. Therefore, the position of the first fixing member 61 with respect to the cylindrical portion 11 in the radial direction is determined via the stator 30. Note that the first fixing portion 62a may be fitted into the first hole portion 31a by shrink fitting.

The first extending portion 62b has a cylindrical shape extending in the axial direction. The lower end of the first extending portion 62b is connected to the upper end of the first fixing portion 62a. The upper portion of the first extending portion 62b passes through the first through hole 12b in the axial direction and protrudes above the first lid member 12. That is, the first main body portion 62 is passed through the first through hole 12b. As shown in FIG. 3, the outer circumferential surface of the first extending portion 62b faces the inner circumferential surface of the first through hole 12b with a gap therebetween. A first male screw portion 62d is provided on the outer peripheral surface of the upper portion of the first extension portion 62b. That is, the first male threaded portion 62d is provided on the outer peripheral surface of the first main body portion 62.

In this embodiment, the first large diameter portion 63 is separate from the first main body portion 62. The first large diameter portion 63 has a substantially annular shape surrounding the first main body portion 62 . The outer diameter of the first large diameter portion 63 is larger than the inner diameter of the upper end of the first tapered portion 12c. The first large diameter portion 63 is located above the first lid member 12, that is, on one side in the axial direction. In this embodiment, the first large diameter portion 63 is a nut. A first female screw portion 63b is provided on the inner peripheral surface of the first large diameter portion 63. The first female screw portion 63b is fastened to the first male screw portion 62d of the first main body portion 62. Thereby, the first large diameter portion 63 is connected to the first main body portion 62.

A second tapered portion 63a is provided on the outer circumferential surface of the lower portion of the first large diameter portion 63, the outer diameter of which decreases toward the lower side, that is, toward the other axial side. The first tapered portion 12c and the second tapered portion 63a of the first lid member 12 are in contact with each other. More specifically, the first large diameter portion 63 is tightened downward into the first male screw portion 62d, and the first tapered portion 12c and the second tapered portion 63a come into contact. This determines the positions of the first large diameter portion 63 and the first lid member 12 in the radial and axial directions. Further, since the first lid member 12 is pressed downward by the first large diameter portion 63, the first lid member 12 and the cylindrical portion 11 are fixed. Therefore, the first fixing member 61 is fixed to the housing 10.

As shown in FIG. 2, the second fixing member 65 has a substantially cylindrical shape extending in the axial direction. The lower end of the second fixing member 65 is located below the second lid member 13. The upper end of the second fixing member 65 is located inside the second hole 31b. In this embodiment, four second fixing members 65 are provided. Each second fixing member 65 has a second main body portion 66 and a second large diameter portion 67. In this embodiment, the configuration of the second fixing member 65 and the configuration of the first fixing member 61 are the same except that they are opposite to each other in the vertical direction (Z-axis direction). . Therefore, in the following description, descriptions of structures similar to those of the first fixing member 61 may be omitted. The second main body portion 66 includes a second fixing portion 66a, a second extending portion 66b, and a second male screw portion 66d.

The second fixing part 66a is the upper part of the second main body part 66. The second fixing portion 66a is inserted into the second hole 31b. The second fixing portion 66a is spaced apart from the first fixing portion 62a in the axial direction. The outer circumferential surface of the second fixing portion 66a is in contact with the inner circumferential surface of the second hole portion 31b. That is, at least a portion of the second main body portion 66 is inserted into the second hole portion 31b and is in contact with the inner circumferential surface of the second hole portion 31b. Further, in this embodiment, the second fixing portion 66a and the second hole portion 31b are fitted into each other. In this embodiment, the second fixing portion 66a is press-fitted into the second hole 31b and fitted into the second hole 31b. Thereby, the second fixing member 65 and the stator 30 are fixed to each other. Therefore, the position of the second fixing member 65 with respect to the cylindrical portion 11 in the radial direction is determined via the stator 30.

The second extending portion 66b has a cylindrical shape extending in the axial direction. The upper end of the second extending portion 66b is connected to the lower end of the second fixing portion 66a. The lower portion of the second extension portion 66b passes through the second through hole 13b in the axial direction, and protrudes below the second lid member 13. That is, the second main body portion 66 is passed through the second through hole 13b. As shown in FIG. 4, the outer circumferential surface of the second extending portion 66b faces the inner circumferential surface of the second through hole 13b with a gap therebetween. A second male screw portion 66d is provided on the outer peripheral surface of the lower portion of the second extension portion 66b. That is, a second male threaded portion 66d is provided on the outer peripheral surface of the second main body portion 66.

The second large diameter portion 67 has a substantially annular shape that protrudes in the axial direction. The outer diameter of the second large diameter portion 67 is larger than the inner diameter of the lower end of the third tapered portion 13c. The second large diameter portion 67 is located below the second lid member 13, that is, on the other axial side. In this embodiment, the second large diameter portion 67 is a nut. A second female screw portion 67b is provided on the inner peripheral surface of the second large diameter portion 67. The second female screw portion 67b is fastened to the second male screw portion 66d of the second main body portion 66. Thereby, the second large diameter portion 67 is connected to the second main body portion 66.

A fourth tapered portion 67a is provided on the outer circumferential surface of the upper portion of the second large diameter portion 67, and the outer diameter decreases toward the upper side, that is, toward one side in the axial direction. The third tapered portion 13c and the fourth tapered portion 67a of the second lid member 13 are in contact with each other. More specifically, the second large diameter portion 67 is tightened upward into the second male screw portion 66d, and the third tapered portion 13c and the fourth tapered portion 67a come into contact. This determines the positions of the second large diameter portion 67 and the second lid member 13 in the radial and axial directions. Further, since the second lid member 13 is pressed upward by the second large diameter portion 67, the second lid member 13 and the cylindrical portion 11 are fixed. Therefore, the second fixing member 65 is fixed to the housing 10.

According to the present embodiment, a shaft 23 rotatable around a central axis J, a rotor 20 fixed to the shaft 23, a stator 30 located on the radially outer side of the rotor 20, and a plurality of It includes bearing members 91 and 92, a housing 10 that accommodates at least a portion of the shaft 23, the rotor 20, and the stator 30 therein, and a first fixing member 61 fixed to the housing 10. The housing 10 has a first opening 11a that opens on the upper side, that is, on one side in the axial direction, and includes a cylindrical portion 11 that surrounds at least a portion of the shaft 23, the rotor 20, and the stator 30 from the outside in the radial direction; It has a first lid member 12 that closes the opening 11a. The stator 30 has a first hole 31a that opens on one side in the axial direction, and is fixed to the cylindrical portion 11. Therefore, the position of the stator 30 with respect to the cylindrical portion 11 can be determined in the radial direction. Therefore, the position of the first hole 31a relative to the cylindrical portion 11 can be determined in the radial direction.
Further, the first lid member 12 has a first through hole 12b that passes through the first lid member 12 in the axial direction, and the first fixing member 61 extends in the axial direction and is passed through the first through hole 12b. It has a first main body part 62 that is at least partially inserted into the first hole part 31a and comes into contact with the inner peripheral surface of the first hole part 31a. That is, at least a portion of the first body portion 62 of the first fixing member 61 is inserted into the first hole 31a and comes into contact with the inner peripheral surface of the first hole 31a. Therefore, the position of the first fixing member 61 relative to the cylindrical portion 11 can be determined in the radial direction via the stator 30.
Further, the first bearing member 91 is held by the first lid member 12, and the first fixing member 61 is connected to the first main body portion 62 and is located above the first lid member 12, that is, on one side in the axial direction. It has a first large diameter portion 63 . A first tapered portion 12c is provided on the inner circumferential surface of the first through hole 12b, the inner diameter of which decreases toward the bottom. A second tapered portion 63a is provided on the outer circumferential surface of the first large diameter portion 63, the outer diameter of which decreases toward the bottom. The first tapered portion 12c and the second tapered portion 63a are in contact with each other. That is, since the first tapered part 12c of the first lid member 12 and the second tapered part 63a of the first fixing member 61 contact each other, the position of the first lid member 12 with respect to the first fixing member 61 in the radial direction can be determined. Therefore, the cylindrical portion 11 and the first lid member 12 are positioned in the radial direction via the stator 30 and the first fixing member 61. Therefore, in the radial direction, the first bearing member 91 held by the first lid member 12 and the stator 30 fixed to the cylindrical portion 11 can be positioned with high precision. Therefore, in the radial direction, it is possible to suppress the position of the shaft 23 and the rotation axis of the rotor 20 fixed to the shaft 23 from shifting from the position of the central axis of the stator 30. Therefore, when the rotating electric machine 1 is driven, contact between the rotor 20 and the stator 30 can be suppressed. Therefore, it is possible to suppress generation of vibration and noise when the rotating electric machine 1 is driven.

As described above, in this embodiment, the inner peripheral surface of the cylindrical portion 11 and the second outer surface 12d2 of the first lid member 12 face each other with the first interval G1 in the radial direction. Therefore, when fixing the first lid member 12 to the cylindrical portion 11, the first outer surface 12d1 of the first lid member 12 and the surface facing upward of the cylindrical portion 11 can be easily brought into contact. Further, as described above, by bringing the first tapered portion 12c of the first lid member 12 into contact with the second tapered portion 63a of the first fixing member 61, the cylindrical portion 11 and the first lid member 12 are brought into contact with each other. radially positioned. Therefore, even when providing the first interval G1 between the inner circumferential surface of the cylindrical portion 11 and the second outer surface 12d2 of the first lid member 12 in the radial direction, the stator 30 and the first fixing member 61 are Through this, the radial positions of the cylindrical portion 11 and the first lid member 12 can be determined with high precision. Therefore, the work of adjusting the radial position of the cylindrical portion 11 and the first lid member 12 is not required, so that it is possible to suppress an increase in the number of manufacturing steps when manufacturing the rotating electric machine 1.

According to this embodiment, the first main body portion 62 and the first hole portion 31a are fitted into each other, and the first fixing member 61 and the stator 30 are fixed to each other. Therefore, the first fixing member 61 and the stator 30 can be positioned with higher accuracy in the radial direction. Therefore, the cylindrical portion 11 and the first lid member 12 can be positioned in the radial direction with higher accuracy via the first fixing member 61 and the stator 30. Therefore, it is possible to prevent the position of the rotation axis of the rotor 20 and the position of the central axis of the stator 30 from shifting in the radial direction. Therefore, generation of vibration and noise when the rotating electrical machine 1 is driven can be more preferably suppressed.

According to this embodiment, the housing 10 includes the second fixing member 65 fixed to the housing 10, the cylindrical part 11 has the second opening 11b opening downward, that is, to the other side in the axial direction, and the housing 10 has the second fixing member 65 fixed to the housing 10. , has a second lid member 13 that closes the second opening 11b, and one bearing member 92 is held by the second lid member 13. The stator 30 has a second hole 31b that opens downward, the second lid member 13 has a second through hole 13b that passes through the second lid member 13 in the axial direction, and the second fixing member 65 has a second main body portion 66 that extends in the axial direction and is passed through the second through hole 13b, and at least a portion thereof is inserted into the second hole portion 31b and comes into contact with the inner circumferential surface of the second hole portion 31b. Therefore, the position of the second fixing member 65 with respect to the cylindrical portion 11 can be determined in the radial direction via the stator 30.
Further, the second fixing member 65 has a second large diameter portion 67 connected to the second main body portion 66 and located below the second lid member 13, and has a second large diameter portion 67 on the inner peripheral surface of the second through hole 13b. , a third tapered portion 13c whose inner diameter becomes smaller toward the upper side is provided, and a fourth tapered portion 67a whose outer diameter becomes smaller toward the upper side is provided on the outer peripheral surface of the second large diameter portion 67; The third tapered portion 13c and the fourth tapered portion 67a are in contact with each other. Therefore, the position of the second lid member 13 with respect to the second fixing member 65 can be determined in the radial direction. Therefore, the cylindrical portion 11 and the second lid member 13 are positioned in the radial direction via the stator 30 and the second fixing member 65. Therefore, in the radial direction, the second bearing member 92 held by the second lid member 13 and the stator 30 fixed to the cylindrical portion 11 can be positioned with high precision. Therefore, in the radial direction, it is possible to suitably suppress the position of the rotating shaft of the rotor 20 and the position of the central axis of the stator 30 from shifting. Therefore, generation of vibration and noise when the rotating electrical machine 1 is driven can be more preferably suppressed.

According to this embodiment, the second main body portion 66 and the second hole portion 31b are fitted into each other, and the second fixing member 65 and the stator 30 are fixed to each other. Therefore, the second fixing member 65 and the stator 30 can be positioned with higher accuracy in the radial direction. Therefore, the cylindrical portion 11 and the second lid member 13 can be positioned in the radial direction with higher accuracy via the second fixing member 65 and the stator 30. Therefore, it is possible to suitably suppress the position of the rotating shaft of the rotor 20 and the position of the central axis of the stator 30 from shifting in the radial direction. Therefore, generation of vibration and noise when the rotating electrical machine 1 is driven can be more preferably suppressed.

According to this embodiment, the first male screw portion 62d is provided on the outer peripheral surface of the first main body portion 62, the second male screw portion 66d is provided on the outer peripheral surface of the second main body portion 66, and the first large diameter portion 63 is a nut fastened to the first male threaded portion 62d, and the second large diameter portion 67 is a nut fastened to the second male threaded portion 66d. Therefore, by tightening the first large diameter part 63 downward into the first male screw part 62d, the position of the first large diameter part 63 in the axial direction can be easily adjusted, and the first tapered part 12c The pressure at which the second tapered portion 63a and the second tapered portion 63a come into contact can be easily adjusted. Similarly, the pressure at which the third tapered portion 13c and the fourth tapered portion 67a come into contact can be easily adjusted. Therefore, the position of the first lid member 12 with respect to the first fixing member 61 and the position of the second lid member 13 with respect to the second fixing member 65 in the radial direction can be determined with high accuracy by a simple operation. Therefore, it is possible to more preferably suppress the position of the rotation axis of the rotor 20 and the position of the central axis of the stator 30 from shifting in the radial direction. Further, it is possible to suppress an increase in the number of manufacturing steps for the rotating electric machine 1.

<Second embodiment>
As shown in FIG. 5, in the rotating electric machine 201 of this embodiment, the positions of the first lid member 12 and the second lid member 13 with respect to the cylindrical portion 11 in the radial direction are determined through one first fixing member 261. decide. The first fixing member 261 of this embodiment has a substantially cylindrical shape extending in the axial direction. The upper end of the first fixing member 261 is located above the first lid member 12. The lower end of the first fixing member 261 is located below the second lid member 13. In this embodiment, four first fixing members 261 are provided. Each first fixing member 261 has a first main body portion 262, a first large diameter portion 63, a second main body portion 266, and a second large diameter portion 67, respectively. Note that the configurations of the first large diameter portion 63 and the second large diameter portion 67 of the present embodiment are similar to the configurations of the first large diameter portion 63 and the second large diameter portion 67 of the first embodiment.

Furthermore, in the stator 30 of this embodiment, the first hole 31a and the second hole 31b are connected to each other in the axial direction, similar to the stator 30 of the first embodiment. The first hole portion 31a and the second hole portion 31b are each part of a hole that passes through the stator core 31 in the axial direction. The first hole portion 31a is an upper portion of a hole that passes through the stator core 31 in the axial direction. The second hole portion 31b is a lower portion of a hole that passes through the stator core 31 in the axial direction. In this embodiment, the inner diameter of the first hole 31a and the inner diameter of the second hole 31b are the same size. Further, the inner circumferential surface of the first hole 31a and the inner circumferential surface of the second hole 31b are connected along the axial direction.

As shown in FIG. 5, the first main body portion 262 has a substantially cylindrical shape extending in the axial direction. The first main body portion 262 is an upper portion of the first fixing member 261 . The first main body portion 262 includes a first fixing portion 262a, a first extending portion 62b, and a first male screw portion 62d. Note that the configurations of the first extending portion 62b and the first male threaded portion 62d of this embodiment are the same as those of the first extending portion 62b and the first male threaded portion 62d of the first embodiment.

The first fixing portion 262a has a cylindrical shape extending in the axial direction. The first fixing part 262a is a lower part of the first main body part 262. The first fixing portion 262a is inserted into the first hole 31a. The outer peripheral surface of the first fixing portion 262a is in contact with the inner peripheral surface of the first hole 31a. The first fixing part 262a and the first hole part 31a are fitted into each other. In this embodiment, the first fixing part 262a is press-fitted into the first hole part 31a and fixed.

As shown in FIG. 5, the second main body portion 266 has a substantially cylindrical shape extending in the axial direction. The second main body portion 266 is a lower portion of the first fixing member 261 . The second main body portion 266 includes a second fixing portion 266a, a second extending portion 66b, and a second male screw portion 66d. Note that the configurations of the second extending portion 66b and the second male screw portion 66d of the present embodiment are similar to the configurations of the second extending portion 66b and the second male screw portion 66d of the first embodiment. The second extending portion 66b is passed through the second through hole 13b. That is, the first fixing member 261 has a second main body portion 266 that is passed through the second through hole 13b.

The second fixing portion 266a has a cylindrical shape extending in the axial direction. The second fixing portion 266a is an upper portion of the second main body portion 266. The second fixing portion 266a is inserted into the second hole 31b. The outer peripheral surface of the second fixing part 266a is in contact with the inner peripheral surface of the second hole part 31b. That is, the first fixing member 261 has a second main body portion 266, at least a portion of which is inserted into the second hole portion 31b and comes into contact with the inner circumferential surface of the second hole portion 31b. In this embodiment, the second fixing part 266a and the second hole part 31b are fitted into each other. In this embodiment, the second fixing part 266a is press-fitted and fixed into the second hole part 31b. Further, as described above, the first fixing portion 262a and the first hole portion 31a are fitted into each other. As a result, the first fixing member 261 and the stator 30 are fixed to each other.

In this embodiment, the upper end of the second fixing part 266a is connected to the lower end of the first fixing part 262a. That is, in the first fixing member 261 of this embodiment, the first body part 262 and the second body part 266 are connected in the axial direction. The outer diameter of the second fixing part 266a and the outer diameter of the first fixing part 262a are the same size. Further, the outer circumferential surface of the second fixing portion 266a and the outer circumferential surface of the first fixing portion 262a are connected along the axial direction.

As shown in FIG. 5, the second large diameter portion 67 is located below the second lid member 13, that is, on the other axial side. In this embodiment, the second large diameter portion 67 is a nut. The second large diameter portion 67 is fastened to the second male screw portion 66d of the second main body portion 266. Thereby, the second large diameter portion 67 is connected to the second main body portion 266. A fourth tapered portion 67a is provided on the outer circumferential surface of the upper portion of the second large diameter portion 67, and the outer diameter becomes smaller toward the upper side. The third tapered portion 13c and the fourth tapered portion 67a of the second lid member 13 are in contact with each other. This determines the positions of the second large diameter portion 67 and the second lid member 13 in the radial and axial directions, and the first fixing member 261 is fixed to the housing 10. The other configurations of the first fixing member 261 are similar to the other configurations of the first fixing member 61 of the first embodiment. Further, the other configurations of the rotating electric machine 201 are the same as the other configurations of the rotating electric machine 1 of the first embodiment.

According to this embodiment, the first fixing member 261 extends in the axial direction and is passed through the second through hole 13b, and at least a portion thereof is inserted into the second hole 31b so that the first fixing member 261 The second main body part 266 is connected to the second main body part 266 and is located below the second lid member 13. A third tapered portion 13c is provided on the inner circumferential surface of the second through hole 13b, and the outer diameter becomes smaller toward the upper side. A fourth tapered portion 67a that becomes smaller is provided, and the third tapered portion 13c and the fourth tapered portion 67a are in contact with each other. Therefore, the position of the second lid member 13 relative to the first fixing member 261 can be determined in the radial direction.
Further, similarly to the first embodiment, the first fixing member 261 and the first lid member 12 can be positioned in the radial direction. That is, the cylindrical portion 11, the first lid member 12, and the second lid member 13 are positioned in the radial direction via one first fixing member. Therefore, the first bearing member 91, the second bearing member 92, and the stator 30 fixed to the cylindrical portion 11 can be positioned in the radial direction via the one first fixing member 261. Therefore, it is possible to suppress the position of the rotation axis of the rotor 20 and the position of the central axis of the stator 30 from shifting in the radial direction via the single first fixing member 261. Therefore, it is possible to suppress contact between the rotor 20 and the stator 30 via the single first fixing member 261 when the rotating electric machine 1 is driven. Therefore, it is possible to suppress the generation of vibration and noise when the rotating electrical machine 1 is driven, and it is possible to reduce the number of parts of the rotating electrical machine 1. Therefore, it is possible to suppress an increase in the number of manufacturing steps and manufacturing cost of the rotating electric machine 1.

According to this embodiment, the second main body portion 266 and the second hole portion 31b are fitted into each other, and the first fixing member 261 and the stator 30 are fixed to each other. Therefore, the first fixing member 261 and the stator 30 can be positioned with higher accuracy in the radial direction. Therefore, the cylindrical portion 11 and the second lid member 13 can be positioned in the radial direction with higher accuracy via the first fixing member 261 and the stator 30. Therefore, it is possible to suitably suppress the position of the rotating shaft of the rotor 20 and the position of the central axis of the stator 30 from shifting in the radial direction. Therefore, generation of vibration and noise when the rotating electrical machine 1 is driven can be more preferably suppressed.

According to this embodiment, the first hole 31a and the second hole 31b are connected in the axial direction. Therefore, the first fixing member 261 can be passed through the inside of the stator 30 in the axial direction via the first hole 31a and the second hole 31b. Therefore, each of the first lid member 12 disposed above the stator 30 and the second lid member 13 disposed below the stator 30 and the cylindrical portion 11 are connected via one first fixing member 261. and can be positioned in the radial direction. Therefore, it is possible to suppress the generation of vibration and noise when the rotating electrical machine 1 is driven, and it is possible to reduce the number of parts of the rotating electrical machine 1. Therefore, it is possible to suppress an increase in the number of manufacturing steps and manufacturing cost of the rotating electric machine 1.

<Modified example>
A configuration of a modification that can be employed in the first embodiment described above will be described. Note that components having the same aspects as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIG. 6, in the rotating electric machine 301 of this modification, the first main body portion 362 and the first large diameter portion 363 of the first fixing member 361 are connected. In this embodiment, the first main body portion 362 and the first large diameter portion 363 are part of the same single member.

As shown in FIG. 6, the first main body portion 362 has a substantially cylindrical shape extending in the axial direction. The first main body portion 362 has a first fixing portion 362a and a first extending portion 362b. In this embodiment, the outer diameter of the first fixing portion 362a is smaller than the inner diameter of the first through hole 12b. Therefore, when fixing the first fixing member 361 to the stator 330, the first fixing part 362a and the first extension part 362b are passed through the first through hole 12b from above, and the first fixing part 362a is inserted into the first hole part 331a. can be inserted into The other configuration of the first fixing part 362a of this modification is the same as the other configuration of the first fixing part 62a of the first embodiment. Furthermore, the first fixing portion 362a and the first hole 331a of the stator core 331 are fitted into each other. Thereby, the first fixing member 361 and the stator 330 are fixed to each other.

The first extending portion 362b has a cylindrical shape extending in the axial direction. The lower end of the first extending portion 362b is connected to the upper end of the first fixing portion 362a. The upper end of the first extending portion 362b is located inside the first through hole 12b. The outer circumferential surface of the first extending portion 362b faces the inner circumferential surface of the first through hole 12b with an interval therebetween.

The first large diameter portion 363 has a substantially cylindrical shape that protrudes in the axial direction. The outer diameter of the first large diameter portion 363 is larger than the upper end of the first tapered portion 12c. The first large diameter portion 363 is located above the first lid member 12. The lower end of the first large diameter portion 363 is connected to the upper end of the first extending portion 362b. Thereby, the first large diameter portion 363 is connected to the first main body portion 362. A second tapered portion 363a is provided on the outer circumferential surface of the lower portion of the first large diameter portion 363, and the outer diameter becomes smaller toward the bottom. The second tapered portion 363a and the first tapered portion 12c of the first lid member 12 are in contact with each other. This determines the positions of the first large diameter portion 363 and the first lid member 12 in the radial and axial directions, and the first fixing member 361 is fixed to the housing 10. The other configurations of the rotating electric machine 301 of this modification are the same as the other configurations of the first embodiment.

In this modification, the first main body portion 362 and the first large diameter portion 363 of the first fixing member 361 are connected, so the first fixing member 361 is composed of a single member. Therefore, the number of parts of the first fixing member 361 can be reduced. Therefore, it is possible to suppress generation of vibration and noise when the rotating electrical machine 1 is driven, and to reduce the manufacturing cost of the rotating electrical machine 301.

In this modification, as described above, the configuration of the second fixing member 65 is the same as the configuration of the second fixing member 65 of the first embodiment, but it is different from the first fixing member 361 of this modification. Similarly, the second fixing member may be composed of a single member. In this case, since the number of parts of the second fixing member can be reduced, the manufacturing cost of the rotating electric machine 301 can be reduced.

The present invention is not limited to the above-described embodiments, and other configurations and other methods may be adopted within the scope of the technical idea of the present invention. For example, as long as the cylindrical portion and the lid member can be positioned in the radial direction, the first fixing member and the second fixing member may have different outer diameters, lengths, and other shapes. Furthermore, the number of first fixing members and second fixing members is not limited to four, and may be three or less, or five or more.

Further, the configuration of the housing is not limited to the configuration of this embodiment, and for example, the cylindrical portion may be cylindrical with one opening that opens only on one side. In this case, since the housing can be configured to include a cylindrical part and one lid part that closes one opening, it is only necessary to provide a hole in the stator on the surface facing the lid part. Manufacturing man-hours can be reduced. Furthermore, in this case, the number of fixing members can be reduced, so the manufacturing cost of the rotating electric machine can be reduced.

The rotating electric machine to which the present invention is applied is not limited to a motor, but may be a generator. The use of the rotating electric machine is not particularly limited. The rotating electric machine may be mounted on equipment other than a vehicle. The use of the drive device to which the present invention is applied is not particularly limited. For example, the drive device may be mounted on a vehicle for purposes other than rotating an axle, or may be mounted on equipment other than the vehicle. The configurations described above in this specification can be combined as appropriate within a mutually consistent range.

DESCRIPTION OF SYMBOLS 1,201,301... Rotating electric machine, 10... Housing, 11... Cylindrical part, 11a... First opening, 11b... Second opening, 12... First lid member, 12b... First through hole, 12c... Third 1 taper part, 13... second lid member, 13b... second through hole, 13c... third taper part, 20... rotor, 21... rotor core, 23... shaft, 30, 330... stator, 31a, 331a... first hole part, 31b...second hole part, 61,261,361...first fixing member, 62,262,362...first main body part, 63,363...first large diameter part, 63a, 363a...second tapered part, 65...Second fixing member, 66, 266...Second main body part, 67...Second large diameter part, 67a...Fourth taper part, 91...First bearing member (bearing member), 92...Second bearing member (bearing member), J...center axis

Claims (8)

1. a shaft rotatable around a central axis;
   a rotor fixed to the shaft;
   a stator located on the radially outer side of the rotor;
   a plurality of bearing members supporting the shaft;
   a housing that houses at least a portion of the shaft, the rotor, and the stator;
   a first fixing member fixed to the housing;
   Equipped with
   The housing includes:
   a cylindrical portion having a first opening opening on one side in the axial direction and surrounding at least a portion of the shaft, the rotor, and the stator from the outside in the radial direction;
   a first lid member that closes the first opening;
   has
   The stator has a first hole opening on one side in the axial direction, and is fixed to the cylindrical part,
   at least one of the bearing members is held by the first lid member;
   The first lid member has a first through hole that passes through the first lid member in the axial direction,
   The first fixing member is
   a first main body portion extending in the axial direction and passing through the first through hole, at least a portion of which is inserted into the first hole portion and comes into contact with the inner circumferential surface of the first hole portion;
   a first large diameter portion connected to the first main body portion and located on one axial side of the first lid member;
   has
   A first tapered portion is provided on the inner circumferential surface of the first through hole, and the inner diameter becomes smaller toward the other side in the axial direction,
   A second tapered portion is provided on the outer circumferential surface of the first large diameter portion, and the outer diameter becomes smaller toward the other side in the axial direction,
   A rotating electrical machine in which the first tapered portion and the second tapered portion are in contact with each other.
2. The rotating electric machine according to claim 1, wherein the first main body portion and the first hole portion are fitted into each other, and the first fixing member and the stator are fixed to each other.
3. a second fixing member fixed to the housing;
   The cylindrical part has a second opening opening on the other side in the axial direction,
   The housing has a second lid member that closes the second opening,
   at least one of the bearing members is held by the second lid member;
   The stator has a second hole opening on the other side in the axial direction,
   The second lid member has a second through hole that passes through the second lid member in the axial direction,
   The second fixing member is
   a second main body portion extending in the axial direction and passing through the second through hole, at least a portion of which is inserted into the second hole portion and comes into contact with the inner circumferential surface of the second hole portion;
   a second large diameter portion connected to the second main body portion and located on the other axial side of the second lid member;
   has
   A third tapered portion is provided on the inner circumferential surface of the second through hole, and the inner diameter becomes smaller toward one side in the axial direction,
   A fourth tapered portion is provided on the outer circumferential surface of the second large diameter portion, and the outer diameter becomes smaller toward one side in the axial direction,
   The rotating electric machine according to claim 1 or 2, wherein the third tapered portion and the fourth tapered portion are in contact with each other.
4. The rotating electrical machine according to claim 3, wherein the second main body portion and the second hole portion are fitted into each other, so that the second fixing member and the stator are fixed to each other.
5. The cylindrical part has a second opening opening on the other side in the axial direction,
   The housing has a second lid member that closes the second opening,
   at least one of the bearing members is held by the second lid member;
   The stator has a second hole opening on the other side in the axial direction,
   The second lid member has a second through hole that passes through the second lid member in the axial direction,
   The first fixing member is
   a second main body portion extending in the axial direction and passing through the second through hole, at least a portion of which is inserted into the second hole portion and comes into contact with the inner circumferential surface of the second hole portion;
   a second large diameter portion connected to the second main body portion and located on the other axial side of the second lid member;
   has
   A third tapered portion is provided on the inner circumferential surface of the second through hole, and the inner diameter becomes smaller toward one side in the axial direction,
   A fourth tapered portion is provided on the outer circumferential surface of the second large diameter portion, and the outer diameter becomes smaller toward one side in the axial direction,
   The rotating electric machine according to claim 1 or 2, wherein the third tapered portion and the fourth tapered portion are in contact with each other.
6. The rotating electric machine according to claim 5, wherein the second main body portion and the second hole portion are fitted into each other, so that the first fixing member and the stator are fixed to each other.
7. The rotating electric machine according to any one of claims 3 to 6, wherein the first hole and the second hole are connected in the axial direction.
8. A male threaded portion is provided on the outer peripheral surface of at least one of the first main body portion and the second main body portion, and at least one of the first large diameter portion and the second large diameter portion is fastened to the male threaded portion. The rotating electric machine according to any one of claims 3 to 7, which is a nut.

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