Rotating electrical machine and drive device

Abstract

The rotating electrical machine is provided with: a rotor that is rotatable about a central axis; the stator is positioned on the radial outer side of the rotor; a cylindrical member located on the outside in the radial direction of the stator and accommodating the stator therein; and a housing having a housing part in which the rotor, the stator, and the cylindrical member are housed. The cylinder member has: a stator fixing part to which the stator is fixed; a first supported part which is positioned closer to one side in the axial direction than the stator fixing part and which is supported by the housing part; and the first connecting part is located between the stator fixing part and the first supported part in the axial direction and connects the stator fixing part and the first supported part. At least a part of the stator fixing part and at least a part of the first connecting part are disposed so as to be separated from the inner surface of the housing part toward the inside in the radial direction.

Description

Technical Field

[0001] This invention relates to rotary electric motors and drive devices. Background Technology

[0002] Previously, an electric motor was known to have a structure in which a stator was fixed inside a cylindrical component such as a cooling jacket disposed inside an outer sleeve. Existing technical documents Patent documents

[0003] Patent Document 1: Japanese Patent Publication No. 2005-204496 Summary of the Invention The technical problem that the invention aims to solve

[0004] In the aforementioned motors, there is a problem that vibrations generated at the stator are transmitted to the outer sleeve via cylindrical components such as the cooling jacket, causing the outer sleeve to vibrate significantly.

[0005] In view of the above, one of the objectives of the present invention is to provide a rotary electric motor and drive device having a structure capable of suppressing housing vibration. Technical solutions adopted to solve technical problems

[0006] One embodiment of the rotary electric motor of the present invention comprises: a rotor rotatable about a central axis; a stator located radially outward of the rotor; a cylindrical member located radially outward of the stator and housing the stator therein; and a housing having a housing portion for housing the rotor, the stator, and the cylindrical member therein. The cylindrical member comprises: a stator fixing portion for fixing the stator; a first supported portion located axially closer to the stator fixing portion and supported by the housing portion; and a first connecting portion located axially between the stator fixing portion and the first supported portion, connecting the stator fixing portion and the first supported portion. At least a portion of the stator fixing portion and at least a portion of the first connecting portion are arranged radially inward from the inner surface of the housing portion.

[0007] One embodiment of the drive device of the present invention is, for example, a drive device for rotating the axle of a vehicle, comprising: the aforementioned rotary motor; and a gear mechanism connected to the rotary motor. Invention Effects

[0008] According to one aspect of the present invention, housing vibration can be suppressed in a rotating electric motor and a drive device. Attached Figure Description

[0009] Figure 1 This is a cross-sectional view showing a portion of the drive device according to the first embodiment. Figure 2This is an exploded perspective view showing a portion of the rotary motor according to the first embodiment. Figure 3 This is a cross-sectional view showing a portion of the rotary motor according to the first embodiment. Figure 4 This is a cross-sectional view showing a portion of the rotary motor according to the second embodiment. Figure 5 This is a perspective view showing the cylindrical component in the third embodiment. Figure 6 This is a cross-sectional view showing a portion of the rotary motor according to the third embodiment. Figure 7 This is a diagram showing the flow of oil within the cylinder component according to the third embodiment. Figure 8 This is a diagram showing the flow of oil within the cylinder component according to the fourth embodiment. Figure 9 This is a perspective view showing the cylindrical component according to the fifth embodiment. Detailed Implementation

[0010] In the accompanying drawings, the XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction is the up-down direction. The side pointed to by the Z-axis arrow (+Z side) is the top, and the opposite side (-Z side) is the bottom. The X-axis direction is orthogonal to the Z-axis direction and represents the front-rear direction of the vehicle on which the drive unit is mounted in the following embodiments. In the following embodiments, the side pointed to by the X-axis arrow (+X side) is the front of the vehicle, and the opposite side (-X side) is the rear of the vehicle. The Y-axis direction is orthogonal to both the X-axis and Z-axis directions and represents the left-right direction of the vehicle, i.e., the vehicle width direction. In the following embodiments, the side pointed to by the Y-axis arrow (+Y side) is the right side of the vehicle, and the opposite side (-Y side) is the left side of the vehicle.

[0011] Furthermore, the front-to-back positional relationship is not limited to the positional relationship described in the following embodiment. It can also be that the +X side is the rear side of the vehicle and the -X side is the front side of the vehicle. In this case, the +Y side is the left side of the vehicle and the -Y side is the right side of the vehicle. In addition, in this specification, "parallel direction" also includes a substantially parallel direction, and "orthogonal direction" also includes a substantially orthogonal direction.

[0012] The central axis J, appropriately shown in the diagram, is an imaginary axis extending in a direction intersecting the vertical direction. More specifically, the central axis J extends in the Y-axis direction, which is orthogonal to the vertical direction, i.e., the left-right direction of the vehicle. In the following description, unless otherwise specified, the direction parallel to the central axis J is simply referred to as the "axial direction," the radial direction centered on the central axis J is simply referred to as the "radial direction," and the circumferential direction centered on the central axis J, i.e., the direction around the central axis J, is simply referred to as the "circumferential direction." In the following description, the right side (+Y side) of the axial direction is referred to as "one side of the axial direction," and the left side (-Y side) of the axial direction is referred to as "the other side of the axial direction." The vertical direction is, for example, the vertical direction, and the front-back and left-right directions (axial direction) are, for example, the horizontal directions orthogonal to the vertical direction.

[0013] <First Implementation> Figure 1 The drive unit 100 shown in this embodiment is a drive unit installed in a vehicle and that rotates the vehicle's axle DS. Vehicles equipped with the drive unit 100 are hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHVs), and electric vehicles (EVs), which use an electric motor as their power source. Figure 1 As shown, the drive device 100 includes a rotary motor 10 and a gear mechanism 20 connected to the rotary motor 10.

[0014] In this embodiment, the rotary motor 10 is a motor. The rotary motor 10 includes: a rotor 40 capable of rotating about a central axis J; a stator 50 located radially outward of the rotor 40; a cylindrical member 60 located radially outward of the stator 50; and a housing 30. The housing 30 internally houses the rotor 40, the stator 50, and the cylindrical member 60.

[0015] The rotor 40 has: a motor shaft 41 arranged along a central axis J; and a rotor core 42 fixed to the motor shaft 41. The motor shaft 41 is rotatable about the central axis J. The motor shaft 41 extends axially. The motor shaft 41 is supported by a pair of bearings 43a and 43b for rotation about the central axis J. The pair of bearings 43a and 43b are, for example, ball bearings. The rotor core 42 is cylindrical, surrounding the motor shaft 41. The inner circumferential surface of the rotor core 42 is directly or indirectly fixed to the outer circumferential surface of the motor shaft 41. The rotor core 42 is constructed, for example, by stacking multiple electromagnetic steel plates or other plate components axially. Although not shown in the figure, the rotor core 42 contains magnets.

[0016] Gear mechanism 20 is connected to rotor 40. More specifically, gear mechanism 20 is connected to the end of motor shaft 41 on the other axial side (-Y side). Gear mechanism 20 transmits the rotation of rotor 40 to vehicle axle DS. Gear mechanism 20 has a reduction gear 21 connected to rotor 40 and a differential gear 22 connected to reduction gear 21. Reduction gear 21 has a first gear shaft 21a, a first gear 21b, a second gear 21c, a third gear 21d, and a second gear shaft 21e.

[0017] The first gear shaft 21a extends axially. The first gear shaft 21a is connected to the end of the motor shaft 41 on the other axial side (-Y side). The first gear 21b is disposed on the outer peripheral surface of the first gear shaft 21a. The second gear shaft 21e is disposed at a radially different position from the first gear shaft 21a and extends axially. The second gear 21c and the third gear 21d are disposed on the outer peripheral surface of the second gear shaft 21e. The second gear 21c meshes with the first gear 21b.

[0018] The differential 22 has a gear ring 22a. The gear ring 22a is rotatable about an axially extending axis. The gear ring 22a meshes with a third gear 21d. The lower end of the gear ring 22a is immersed in oil O stored in the gear housing 32 (described later). The oil O is lifted by the rotation of the gear ring 22a. The lifted oil O is supplied, for example, as lubricating oil to the reduction gear 21 and the differential 22. The vehicle axle DS is connected to the differential 22. By driving the rotary motor 10, the rotation of the rotary motor 10 is transmitted to the vehicle axle DS via the gear mechanism 20, enabling the vehicle wheels to rotate.

[0019] The stator 50 is annular, surrounding the rotor 40. The stator 50 has a stator core 51 and a coil assembly 52. ​​The stator core 51 is located radially outside the rotor core 42 and is disposed opposite to the rotor core 42 with a gap between them. The stator core 51 is constructed, for example, by stacking multiple plate members such as electromagnetic steel plates axially. The stator core 51 is annular, surrounding the central axis J. In this embodiment, the stator core 51 is cylindrical, opening axially to both sides with the central axis J as its center.

[0020] The coil assembly 52 has a plurality of coils 52a mounted on the stator core 51. Although not shown in the figure, the coil assembly 52 may have a bundling member for bundling the coils 52a, and may also have jumpers for connecting the coils 52a to each other. The coil assembly 52 has coil end portions 53a and 53b that protrude axially further than the stator core 51. The coil end portion 53a protrudes further axially to one side (+Y side) than the stator core 51. The coil end portion 53b protrudes further axially to the other side (-Y side) than the stator core 51.

[0021] like Figure 2As shown, the coil ends 53a and 53b are in the shape of annulus surrounding the central axis J. In this embodiment, the coil ends 53a and 53b are in the shape of annulus with the central axis J as the center. The coil ends 53a and 53b have a portion of each coil 52a that protrudes axially further than the stator core 51. The coil ends 53a and 53b may have a bundling member or the like for bundling the coils 52a together, or they may have jumper wires for connecting the coils 52a to each other.

[0022] like Figure 1 As shown, the housing 30 includes a motor housing 31, a gear housing 32, and a dividing wall 33. The motor housing 31 is a housing that internally houses the rotor 40, the stator 50, and the cylindrical member 60. The gear housing 32 internally houses the gear mechanism 20. In this embodiment, the motor housing 31 and the gear housing 32 are arranged axially. The gear housing 32 is located on the opposite axial side (-Y side) of the motor housing 31. The gear housing 32 is connected to the opposite axial side of the motor housing 31.

[0023] A dividing wall 33 divides the interior of the motor housing 31 and the interior of the gear housing 32. The dividing wall 33 is a wall that axially separates the interior of the motor housing 31 and the interior of the gear housing 32. A bearing 43b is held in the dividing wall 33, supporting the rotatable end of the motor shaft 41 on the other axial side (-Y side). A bearing 23 is held in the dividing wall 33, supporting the rotatable portion of the first gear shaft 21a on one axial side (+Y side). The bearing 23 is, for example, a ball bearing.

[0024] The motor housing 31 has: a cylindrical peripheral wall portion 31a opening to one axial side (+Y side); and a motor cover 31b that seals the axial end of the peripheral wall portion 31a. The peripheral wall portion 31a and the motor cover 31b are separate from each other. A bearing 43a is held in the motor cover 31b, and the bearing 43a supports the axial end of the motor shaft 41 so that it can rotate.

[0025] The peripheral wall portion 31a has a first support portion 34a and a second support portion 34b. That is, the motor housing 31 has a first support portion 34a and a second support portion 34b. The first support portion 34a and the second support portion 34b are annular around the central axis J. In this embodiment, the first support portion 34a and the second support portion 34b are annular around the central axis J. The first support portion 34a is the support portion that surrounds the first supported portion 62a (described later). The second support portion 34b is the support portion that surrounds the second supported portion 62b (described later).

[0026] In this embodiment, the first support portion 34a is formed by a portion of the axial side (+Y side) of the peripheral wall portion 31a. The first support portion 34a is disposed away from the end of the axial side of the peripheral wall portion 31a toward the other axial side (-Y side). The first support portion 34a is located at a position axially closer to the stator core portion 51.

[0027] In this embodiment, the second support portion 34b is formed by the end portion of the peripheral wall portion 31a on the opposite axial side (-Y side). The second support portion 34b is located on the opposite axial side of the stator core portion 51. The radially inner surface of the second support portion 34b is located radially inner than the radially inner surface of the first support portion 34a. The inner diameter of the second support portion 34b is smaller than the inner diameter of the first support portion 34a. The end portion of the second support portion 34b on the opposite axial side is connected to the dividing wall portion 33.

[0028] The portion of the peripheral wall portion 31a located axially between the first support portion 34a and the second support portion 34b is a opposing portion 34c, which is radially separated from the cylindrical member 60. The opposing portion 34c is annular, surrounding the central axis J. In this embodiment, the opposing portion 34c is cylindrical, centered on the central axis J. The radially inner surface of the opposing portion 34c is located radially inner than the radially inner surface of the first support portion 34a, and radially outer than the radially inner surface of the second support portion 34b. The inner diameter of the opposing portion 34c is smaller than the inner diameter of the first support portion 34a, and larger than the inner diameter of the second support portion 34b.

[0029] like Figure 3 As shown, a first stepped portion 34d is axially disposed between the radially inner surface of the opposing portion 34c and the radially inner surface of the first support portion 34a. This first stepped portion 34d has a first stepped surface 34f facing one axial direction (+Y side). The first stepped surface 34f is annular about the central axis J. The first stepped surface 34f is inclined axially relative to the surface orthogonal to the axial direction. Therefore, for example, when the peripheral wall portion 31a is manufactured by mold forming using a mold, the first stepped surface 34f can be manufactured more easily than when the first stepped surface 34f is an axially orthogonal surface. Therefore, the peripheral wall portion 31a having the first stepped surface 34f on its radially inner surface can be manufactured easily. The first stepped surface 34f is located on one axial direction as it faces radially outward. A second stepped portion 34e is axially disposed between the radially inner surface of the opposing portion 34c and the radially inner surface of the second support portion 34b. The second stepped portion 34e has a second stepped surface 34g facing one axial direction. The second stepped surface 34g is annular about the central axis J. The second step surface 34g is a flat surface orthogonal to the axial direction.

[0030] like Figure 2As shown, the peripheral wall portion 31a has a fixing surface 35 that protrudes radially outward from the end of the radially inner surface of the first support portion 34a on one axial side (+Y side). The fixing surface 35 forms part of the inner surface of the peripheral wall portion 31a. The fixing surface 35 is a surface facing one axial side. The fixing surface 35 is orthogonal to the axial direction. A plurality of fixing surfaces 35 are provided at intervals in the circumferential direction. The plurality of fixing surfaces 35 are arranged at equal intervals over the entire circumferential range. In this embodiment, four fixing surfaces 35 are provided. The circumferential dimension of each fixing surface 35 decreases as it faces radially outward. Each fixing surface 35 is provided with a threaded hole portion 35a recessed towards the other axial side (-Y side).

[0031] like Figure 1 As shown, in this embodiment, the housing 30 has a storage section 39 for storing oil O, which is a fluid. Oil O serves as a refrigerant for cooling the rotary motor 10. Furthermore, oil O serves as a lubricant for the gear mechanism 20. As oil O, for example, to perform both the functions of refrigerant and lubricant, it is preferable to use an oil with a relatively low viscosity, such as automatic transmission fluid (ATF). In this embodiment, the storage section 39 is provided within the gear housing 32. More specifically, the storage section 39 is formed by the lower portion of the gear housing 32, including the bottom wall portion.

[0032] The cylindrical component 60 is cylindrical, surrounding the stator 50. For example... Figure 2 As shown, in this embodiment, the cylindrical member 60 is a generally cylindrical shape with openings on both sides axially around the central axis J. The cylindrical member 60 houses the stator 50 inside. In this embodiment, the cylindrical member 60 is a single component. The cylindrical member 60 has a stator fixing part 61, a first supported part 62a, a second supported part 62b, a first connecting part 63a, a second connecting part 63b, and a fixing part 65.

[0033] The stator fixing portion 61 is cylindrical, surrounding the stator core portion 51. In this embodiment, the stator fixing portion 61 is cylindrical with the central axis J as its center. Figure 1 As shown, at least a portion of the stator fixing portion 61 is disposed radially inward from the inner surface of the motor housing 31. In this embodiment, the stator fixing portion 61 is disposed radially inward from the inner surface of the motor housing 31 as a whole. More specifically, the stator fixing portion 61 is disposed radially inward from the radially inner side surface of the opposing portion 34c as a whole. The radially outer side surface of the stator fixing portion 61 faces the radially inner side surface of the opposing portion 34c across a gap G1.

[0034] The stator 50 is fixed to the stator fixing portion 61. In this embodiment, the stator core 51 is pressed into and fixed inside the stator fixing portion 61. The radially inner surface of the stator fixing portion 61 contacts the radially outer surface of the stator core 51. In this embodiment, the radially outer surface of the stator core 51 contacts the radially inner surface of the stator fixing portion 61 throughout the entire circumference of the central axis J. Alternatively, the stator core 51 can be fixed to the stator fixing portion 61 by heat fitting, or by an adhesive provided between the stator core 51 and the stator fixing portion 61. Furthermore, the stator core 51 can also be fixed to the stator fixing portion 61 with other components spaced between it and the stator fixing portion 61.

[0035] The first supported portion 62a is located on the axial side (+Y side) of the stator fixing portion 61. The first supported portion 62a is located radially outside the portion on the axial side of the coil edge 53a. The first supported portion 62a is annular, surrounding the portion on the axial side of the coil edge 53a around the central axis J. In this embodiment, the first supported portion 62a is annular, centered on the central axis J.

[0036] The first supported portion 62a is fitted into the first support portion 34a. Thus, the first supported portion 62a is radially supported on the motor housing 31. In this embodiment, the first supported portion 62a is clearance-fitted into the first support portion 34a. Therefore, compared to the case where the first supported portion 62a is interference-fitted into the first support portion 34a, it is possible to suppress the application of excessive force from the motor housing 31 to the first supported portion 62a. Thus, damage to the first supported portion 62a can be suppressed while ensuring that the first supported portion 62a is supported on the motor housing 31. Furthermore, by fitting the first supported portion 62a into the first support portion 34a to support the motor housing 31, compared to the case where the first supported portion 62a is fixed to the motor housing 31 by screws or other threaded members to support the first supported portion 62a, the number of components in the rotary motor 10 can be reduced.

[0037] Alternatively, the first supported portion 62a can be fitted into the first support portion 34a through a fit other than a clearance fit. For example, the first supported portion 62a can be fitted into the first support portion 34a through an interference fit or a transition fit. When the first supported portion 62a is supported through these fits, the number of components in the rotary motor 10 can be reduced compared to the case where the first supported portion 62a is supported to the motor housing 31 by threaded members such as screws.

[0038] A sealing member 66a is provided between the radially outer surface of the first supported portion 62a and the radially inner surface of the first support portion 34a. In this embodiment, the sealing member 66a is an annular O-ring surrounding the first supported portion 62a. The sealing member 66a seals the radially outer surface of the first supported portion 62a and the radially inner surface of the first support portion 34a circumferentially. In this embodiment, the sealing member 66a is embedded in a groove provided on the radially outer surface of the first supported portion 62a and held in the cylindrical member 60.

[0039] In this embodiment, the inner diameter of the first supported portion 62a is the same as the inner diameter of the stator fixing portion 61. In this embodiment, the outer diameter of the first supported portion 62a is larger than the outer diameter of the stator fixing portion 61. Figure 3 As shown, the radial dimension T2a of the wall portion constituting the first supported portion 62a is larger than the radial dimension T1 of the wall portion constituting the stator fixing portion 61. In other words, the radial dimension T1 of the wall portion constituting the stator fixing portion 61 is smaller than the radial dimension T2a of the wall portion constituting the first supported portion 62a.

[0040] In this embodiment, the radial dimension T2a of the wall portion constituting the first supported portion 62a is approximately the same throughout the entire axial direction. More specifically, except for the two axial ends of the first supported portion 62a, the radial dimension T2a of the wall portion constituting the first supported portion 62a is the same throughout the entire axial direction. The radial dimension T2a of the wall portion constituting the first supported portion 62a is slightly smaller at the two axial ends of the first supported portion 62a. The radial dimension T1 of the wall portion constituting the stator fixing portion 61 is the same throughout the entire axial direction.

[0041] Furthermore, in this specification, "radial dimension of the wall portion constituting a certain part" refers to the radial thickness of the wall portion constituting a certain part, or the radial distance between the radially inner surface and the radially outer surface of a certain part. That is, the radial dimension T1 of the wall portion constituting the stator fixing part 61 is the radial distance between the radially inner surface and the radially outer surface of the stator fixing part 61. The radial dimension T2a of the wall portion constituting the first supported part 62a is the radial distance between the radially inner surface and the radially outer surface of the first supported part 62a.

[0042] The first connecting portion 63a is located axially between the stator fixing portion 61 and the first supported portion 62a. The first connecting portion 63a is annular, surrounding the central axis J. In this embodiment, the first connecting portion 63a is annular, centered on the central axis J. The first connecting portion 63a connects the stator fixing portion 61 and the first supported portion 62a. The end of the first connecting portion 63a on one axial side (+Y side) is connected to the end of the first supported portion 62a on the other axial side (-Y side). The end of the first connecting portion 63a on the other axial side is connected to the end of the stator fixing portion 61 on one axial side.

[0043] The first connecting portion 63a is located on the axial side (+Y side) of the stator core portion 51. The first connecting portion 63a is located radially outward of the portion on the other axial side (-Y side) of the coil end 53a. The first connecting portion 63a surrounds the portion on the other axial side of the coil end 53a around the central axis J. At least a portion of the first connecting portion 63a is arranged radially outward from the coil end 53a. In this embodiment, the entire first connecting portion 63a is arranged radially outward from the coil end 53a. The radially inner surface of the first connecting portion 63a does not contact the stator 50.

[0044] At least a portion of the first connecting portion 63a is arranged radially inward from the inner surface of the motor housing 31. Therefore, the rigidity of the first connecting portion 63a is likely to be less than the rigidity of the stator fixing portion 61 to which the stator 50 is fixed and the rigidity of the first supported portion 62a supported by the motor housing 31. Consequently, in the cylindrical member 60, the first connecting portion 63a is more prone to vibration than the stator fixing portion 61 and the first supported portion 62a. Therefore, if vibration generated at the stator 50 is transmitted to the first connecting portion 63a via the stator fixing portion 61, the first connecting portion 63a is more prone to significant vibration compared to the stator fixing portion 61 and the first supported portion 62a, and this vibration is easily attenuated at the first connecting portion 63a. Therefore, the vibration transmitted from the first connecting portion 63a to the first supported portion 62a is easily reduced, and the vibration transmitted from the first supported portion 62a to the motor housing 31 is easily reduced.

[0045] Furthermore, as described above, at least a portion of the stator fixing portion 61 is arranged radially inward from the inner surface of the motor housing 31. Therefore, vibrations transmitted from the stator 50 to the stator fixing portion 61 can be suppressed from being directly transmitted from the stator fixing portion 61 to the motor housing 31. Consequently, vibrations transmitted from the stator 50 to the stator fixing portion 61 are easily transmitted to the first connecting portion 63a that connects the stator fixing portion 61 and the first supported portion 62a. Therefore, vibrations generated at the stator 50 are easily attenuated at the first connecting portion 63a before being transmitted to the motor housing 31, and the vibrations transmitted to the motor housing 31 are easily and appropriately reduced.

[0046] As described above, in this embodiment, the vibration generated at the stator 50 fixed to the cylindrical member 60 is configured such that it easily passes through the easily vibrating first connecting portion 63a before being transmitted to the motor housing 31. This allows the vibration transmitted from the cylindrical member 60 to the motor housing 31 to be appropriately reduced. Therefore, vibration of the housing 30 can be suppressed. The first connecting portion 63a of this embodiment makes it particularly easy to appropriately attenuate radial vibrations generated at the stator 50. Therefore, radial vibration of the housing 30 can be appropriately suppressed, especially effectively.

[0047] In this embodiment, the first connecting portion 63a is disposed radially inward from the inner surface of the motor housing 31. Therefore, the rigidity of the first connecting portion 63a is more likely to be less than the rigidity of the stator fixing portion 61 and the rigidity of the first supported portion 62a. Consequently, it is easier to vibrate the first connecting portion 63a, and it is easier to attenuate the vibration at the first connecting portion 63a. Therefore, the vibration transmitted from the first supported portion 62a to the motor housing 31 is more easily reduced, and vibration of the housing 30 can be further suppressed.

[0048] Furthermore, as described above, in this embodiment, the stator fixing portion 61 is disposed radially inwardly separated from the inner surface of the motor housing 31. Therefore, vibrations transmitted from the stator 50 to the stator fixing portion 61 are not directly transmitted from the stator fixing portion 61 to the motor housing 31. Consequently, vibrations transmitted to the stator fixing portion 61 can be easily and appropriately transmitted to the first connecting portion 63a, and the vibrations can be further and appropriately attenuated at the first connecting portion 63a. Therefore, vibrations transmitted from the first supported portion 62a to the motor housing 31 are more easily reduced, and vibrations of the housing 30 can be further suppressed.

[0049] In this embodiment, the first connecting portion 63a is radially separated from the end of the opposing portion 34c on one axial side (+Y side). The first connecting portion 63a is arranged radially outward from the coil edge end 53a. In this embodiment, the first connecting portion 63a does not contact any of the components constituting the rotary motor 10 within the motor housing 31. Therefore, the rigidity of the first connecting portion 63a is more likely to be less than the rigidity of the stator fixing portion 61 and the rigidity of the first supported portion 62a. As a result, it is easier to vibrate the first connecting portion 63a and to attenuate the vibration at the first connecting portion 63a. Therefore, the vibration transmitted from the first supported portion 62a to the motor housing 31 is more likely to be reduced, and the vibration of the housing 30 can be further suppressed.

[0050] In this embodiment, the inner diameter of the first connecting portion 63a is the same as the inner diameter of the stator fixing portion 61 and the inner diameter of the first supported portion 62a. The outer diameter of the first connecting portion 63a is the same as the outer diameter of the stator fixing portion 61, and smaller than the outer diameter of the first supported portion 62a.

[0051] The radial dimension T3a of at least a portion of the wall portion constituting the first connecting portion 63a is less than or equal to the radial dimension T2a of the wall portion constituting the first supported portion 62a and the radial dimension T1 of the wall portion constituting the stator fixing portion 61. Therefore, it is easier to further reduce the rigidity of the first connecting portion 63a to be less than the rigidity of the first supported portion 62a and the rigidity of the stator fixing portion 61. This further facilitates vibration attenuation at the first connecting portion 63a and further suppresses vibration of the housing 30.

[0052] In this embodiment, the radial dimension T3a of the wall portion constituting the first connecting portion 63a is the same throughout the entire axial direction. In this embodiment, the radial dimension T3a of the wall portion constituting the first connecting portion 63a is smaller than the radial dimension T2a of the wall portion constituting the first supported portion 62a. Therefore, it is easier to further reduce the rigidity of the first connecting portion 63a to be smaller than the rigidity of the first supported portion 62a and the rigidity of the stator fixing portion 61. Therefore, vibration attenuation at the first connecting portion 63a can be further facilitated, and vibration of the housing 30 can be further suppressed.

[0053] In this embodiment, the radial dimension T3a of the wall portion constituting the first connecting portion 63a is the same as the radial dimension T1 of the wall portion constituting the stator fixing portion 61. Therefore, compared to the case where the radial dimension T3a of the wall portion constituting the first connecting portion 63a is smaller than the radial dimension T1 of the wall portion constituting the stator fixing portion 61, it is possible to suppress the excessive rigidity of the first connecting portion 63a. Thus, the rigidity of the first connecting portion 63a is ensured to a certain extent, while the rigidity of the first connecting portion 63a can be appropriately reduced more easily.

[0054] In this embodiment, the radially outer surface of the first connecting portion 63a is smoothly connected to the axial side (+Y side) of the radially outer surface of the stator fixing portion 61 without any steps. A stepped portion 64a is provided between the radially outer surface of the first connecting portion 63a and the radially outer surface of the first supported portion 62a in the axial direction, and the stepped portion 64a has a stepped surface 64c facing the other axial side (-Y side). The radially inner surface of the first connecting portion 63a is smoothly connected to the axial side of the radially inner surface of the stator fixing portion 61 without any steps. The radially inner surface of the first connecting portion 63a is smoothly connected to the other axial side of the radially inner surface of the first supported portion 62a without any steps.

[0055] The second supported portion 62b is located on the opposite side (-Y side) of the stator fixing portion 61 along the axial direction. The second supported portion 62b is located radially outside the portion on the opposite side of the axial direction of the coil edge 53b. The second supported portion 62b is annular, surrounding the portion on the opposite side of the axial direction of the coil edge 53b around the central axis J. In this embodiment, the second supported portion 62b is annular with the central axis J as its center.

[0056] The second supported portion 62b is embedded within the second supported portion 34b. Thus, the second supported portion 62b is radially supported against the motor housing 31. In this embodiment, the second supported portion 62b is clearance-fitted into the second supported portion 34b. Therefore, compared to the case where the second supported portion 62b is interference-fitted into the second supported portion 34b, it is possible to suppress the application of excessive force from the motor housing 31 to the second supported portion 62b. Thus, damage to the second supported portion 62b can be suppressed while ensuring its support against the motor housing 31. Furthermore, by fitting the second supported portion 62b into the second supported portion 34b to support the motor housing 31, compared to fixing the second supported portion 62b to the motor housing 31 using threaded members such as screws, the number of components in the rotary motor 10 can be reduced.

[0057] Alternatively, the second supported portion 62b can also be fitted into the second support portion 34b through a fit other than a clearance fit. For example, the second supported portion 62b can be fitted into the second support portion 34b through an interference fit or a transition fit. When the second supported portion 62b is supported by these fits, the number of components in the rotary motor 10 can be reduced compared to the case where the second supported portion 62b is supported to the motor housing 31 by threaded members such as screws.

[0058] The end of the second supported portion 62b on one axial side (+Y side) protrudes to a position axially closer to the second support portion 34b. A sealing member 66b is provided between the radially outer surface of the second supported portion 62b and the radially inner surface of the second support portion 34b. In this embodiment, the sealing member 66b is an annular O-ring surrounding the second supported portion 62b. The sealing member 66b seals the radially outer surface of the second supported portion 62b and the radially inner surface of the second support portion 34b circumferentially. In this embodiment, the sealing member 66b is embedded in a groove provided on the radially outer surface of the second supported portion 62b and held in the cylindrical member 60.

[0059] In this embodiment, the inner diameter of the second supported portion 62b is the same as the inner diameter of the stator fixing portion 61. In this embodiment, the outer diameter of the second supported portion 62b is larger than the outer diameter of the stator fixing portion 61. The radial dimension T2b of the wall portion constituting the second supported portion 62b is larger than the radial dimension T1 of the wall portion constituting the stator fixing portion 61. In other words, the radial dimension T1 of the wall portion constituting the stator fixing portion 61 is smaller than the radial dimension T2b of the wall portion constituting the second supported portion 62b.

[0060] In this embodiment, the radial dimension T2b of the wall portion constituting the second supported portion 62b is approximately the same throughout the entire axial direction. More specifically, except for the end portion on the other side (-Y side) of the axial direction of the second supported portion 62b, the radial dimension T2b of the wall portion constituting the second supported portion 62b is the same throughout the entire axial direction. The radial dimension T2b of the wall portion constituting the second supported portion 62b is slightly smaller at the end portion on the other side of the axial direction of the second supported portion 62b. In this embodiment, the radial dimension T2b of the wall portion constituting the second supported portion 62b is smaller than the radial dimension T2a of the wall portion constituting the first supported portion 62a. The axial dimension of the second supported portion 62b is larger than the axial dimension of the first supported portion 62a. Alternatively, the axial dimension of the second supported portion 62b may be the same as or smaller than the axial dimension of the first supported portion 62a. The end portion on the other side of the axial direction of the second supported portion 62b is axially separated from the dividing wall portion 33 by a gap.

[0061] The second connecting portion 63b is located axially between the stator fixing portion 61 and the second supported portion 62b. The second connecting portion 63b is annular, surrounding the central axis J. In this embodiment, the second connecting portion 63b is annular with the central axis J as its center. The second connecting portion 63b connects the stator fixing portion 61 and the second supported portion 62b. One axial side (+Y side) end of the second connecting portion 63b is connected to the other axial side (-Y side) end of the stator fixing portion 61. The other axial side end of the second connecting portion 63b is connected to one axial side end of the second supported portion 62b.

[0062] The second connecting portion 63b is located on the opposite side (-Y side) axially relative to the stator core portion 51. The second connecting portion 63b is located radially outward of the portion on one axial side (+Y side) of the coil end 53b. The second connecting portion 63b surrounds the portion on one axial side of the coil end 53b around the central axis J. At least a portion of the second connecting portion 63b is disposed radially outward from the coil end 53b. In this embodiment, the second connecting portion 63b is disposed entirely radially outward from the coil end 53b. The radially inner surface of the second connecting portion 63b does not contact the stator 50.

[0063] At least a portion of the second connecting portion 63b is arranged radially inward from the inner surface of the motor housing 31. Therefore, the rigidity of the second connecting portion 63b is easily less than the rigidity of the stator fixing portion 61 to which the stator 50 is fixed and the rigidity of the second supported portion 62b supported on the motor housing 31. Consequently, in the cylindrical member 60, the second connecting portion 63b is more prone to vibration than the stator fixing portion 61 and the second supported portion 62b. Therefore, if vibration generated at the stator 50 is transmitted to the second connecting portion 63b via the stator fixing portion 61, the second connecting portion 63b is more prone to significant vibration compared to the stator fixing portion 61 and the second supported portion 62b, and this vibration is easily attenuated at the second connecting portion 63b. Therefore, the vibration transmitted from the second connecting portion 63b to the second supported portion 62b is easily reduced, and the vibration transmitted from the second supported portion 62b to the motor housing 31 is easily reduced. This makes it easier to reduce the vibration transmitted from the first supported portion 62a and the second supported portion 62b to the motor housing 31. Therefore, the vibration of the housing 30 can be suppressed more effectively.

[0064] Thus, in this embodiment, by providing the first connecting portion 63a and the second connecting portion 63b, the cylindrical member 60 can be axially supported at both ends at the first supported portion 62a and the second supported portion 62b, while appropriately suppressing the transmission of vibration from the stator 50 to the housing 30 via the cylindrical member 60. Therefore, the stator 50, which is fixed within the cylindrical member 60, can be stably maintained, and the vibration of the housing 30 can be further appropriately suppressed.

[0065] In this embodiment, the second connecting portion 63b is disposed radially inward from the inner surface of the motor housing 31. Therefore, the rigidity of the second connecting portion 63b is more likely to be less than the rigidity of the stator fixing portion 61 and the rigidity of the second supported portion 62b. Consequently, it is easier to vibrate the second connecting portion 63b, and it is easier to attenuate the vibration at the second connecting portion 63b. Therefore, the vibration transmitted from the second supported portion 62b to the motor housing 31 is more easily reduced, and vibration of the housing 30 can be further suppressed.

[0066] In this embodiment, the stator fixing portion 61, the first connecting portion 63a, and the second connecting portion 63b are arranged radially inward from the inner surface of the motor housing 31. Therefore, vibrations generated at the stator 50 are not directly transmitted to the motor housing 31 from each of the stator fixing portion 61, the first connecting portion 63a, and the second connecting portion 63b. Vibrations transmitted from the stator 50 to the stator fixing portion 61 are dispersed and transmitted to the first connecting portion 63a and the second connecting portion 63b, and then transmitted to the motor housing 31 from each supported portion connected to each connecting portion. Therefore, vibrations generated at the stator 50 pass through the first connecting portion 63a or the second connecting portion 63b before being transmitted to the motor housing 31. This allows all vibrations transmitted from the stator 50 to the motor housing 31 to become vibrations attenuated at the first connecting portion 63a or the second connecting portion 63b. Therefore, the transmission of vibrations from the stator 50 to the housing 30 can be further appropriately suppressed, and the vibration of the housing 30 can be further appropriately suppressed.

[0067] In this embodiment, the second connecting portion 63b is radially separated from the portion on the opposite side (-Y side) of the opposing portion 34c. The second connecting portion 63b is arranged radially outward from the coil edge end 53b. In this embodiment, the second connecting portion 63b does not contact any of the components constituting the rotary motor 10 within the motor housing 31. Therefore, the rigidity of the second connecting portion 63b is more likely to be less than the rigidity of the stator fixing portion 61 and the rigidity of the second supported portion 62b. As a result, it is easier to vibrate the second connecting portion 63b and to attenuate the vibration at the second connecting portion 63b. Therefore, the vibration transmitted from the second supported portion 62b to the motor housing 31 is more likely to be reduced, and the vibration of the housing 30 can be further suppressed.

[0068] In this embodiment, the inner diameter of the second connecting portion 63b is the same as the inner diameter of the stator fixing portion 61 and the inner diameter of the second supported portion 62b. The outer diameter of the second connecting portion 63b is the same as the outer diameter of the stator fixing portion 61 and smaller than the outer diameter of the second supported portion 62b. In this embodiment, the inner and outer diameters of the second connecting portion 63b are the same as the inner and outer diameters of the first connecting portion 63a, respectively.

[0069] The radial dimension T3b of the wall constituting the second connecting portion 63b and the radial dimension T2b of the wall constituting the second supported portion 62b are in the same relationship as the radial dimension T3a of the wall constituting the first connecting portion 63a and the radial dimension T2a of the wall constituting the first supported portion 62a. In this embodiment, the radial dimension T3b of the wall constituting the second connecting portion 63b is the same as the radial dimension T3a of the wall constituting the first connecting portion 63a.

[0070] The radially outer surface of the second connecting portion 63b is smoothly connected to the other axial side (-Y side) of the radially outer surface of the stator fixing portion 61 without any steps. A stepped portion 64b is provided between the radially outer surface of the second connecting portion 63b and the radially outer surface of the second supported portion 62b in the axial direction, and the stepped portion 64b has a stepped surface 64d facing one axial side (+Y side). The radially inner surface of the second connecting portion 63b is smoothly connected to the other axial side of the radially inner surface of the stator fixing portion 61 without any steps. The radially inner surface of the second connecting portion 63b is smoothly connected to one axial side of the radially inner surface of the second supported portion 62b without any steps.

[0071] As described above, in this embodiment, the first supported portion 62a is fitted into the first support portion 34a. Therefore, by properly positioning the first supported portion 62a radially by the first support portion 34a, the radial rigidity of the first supported portion 62a is easily increased. Consequently, the radial rigidity of the first connecting portion 63a is relatively reduced. Therefore, it is further easier to properly attenuate radial vibrations generated at the stator 50 at the first connecting portion 63a. Thus, vibration of the housing 30 can be more effectively suppressed. The same effect applies to the second supported portion 62b and the second connecting portion 63b.

[0072] As described above, in this embodiment, the radially outer surface of the stator core 51 contacts the radially inner surface of the stator fixing portion 61 throughout the entire circumference of the central axis J. Therefore, it is easier to increase the rigidity of the stator fixing portion 61 to which the stator core 51 is fixed. Consequently, it is easier to relatively reduce the rigidity of the first connecting portion 63a and the second connecting portion 63b. Therefore, it is easier to appropriately attenuate vibrations generated at the stator 50 at the first connecting portion 63a and the second connecting portion 63b. Therefore, vibrations of the housing 30 can be more appropriately suppressed. Furthermore, the stator 50 can be further securely and stably held by the cylindrical member 60.

[0073] like Figure 2 As shown, the fixed portion 65 is connected to one axial side (+Y side) of the first supported portion 62a. The fixed portion 65 has: an annular base 65a surrounding the central axis J; and a plurality of protrusions 65b protruding radially outward from the base 65a. The base 65a is approximately annular about the central axis J. The outer diameter of the base 65a is smaller than the outer diameter of the first supported portion 62a. The inner diameter of the base 65a is the same as the inner diameter of the first supported portion 62a.

[0074] Multiple protrusions 65b are spaced apart circumferentially. The multiple protrusions 65b are equally spaced throughout the entire circumference. In this embodiment, four protrusions 65b are provided. The circumferential dimension of each protrusion 65b decreases as it moves radially outward. Each protrusion 65b has a hole 65c that extends axially through it. Bolts screwed into threaded holes 35a of each fixing surface 35 of the motor housing 31 pass through the holes 65c of each protrusion 65b from one axial side (+Y side). Each protrusion 65b is fixed to its fixing surface 35 by these bolts. Thus, the fixed part 65 is fixed to the motor housing 31, and the cylindrical member 60 is fixed to the motor housing 31.

[0075] By fixing the first supported portion 62a to the motor housing 31 via the fixed portion 65 connected to it, the rigidity of the first supported portion 62a can be further increased. This, in turn, further reduces the relative rigidity of the first connecting portion 63a, making it more prone to vibration. Consequently, it becomes easier to appropriately attenuate vibrations generated at the stator 50 at the first connecting portion 63a. Therefore, vibrations of the housing 30 can be more effectively suppressed.

[0076] like Figure 1 As shown, the drive device 100 has a flow path 80 that guides oil O to a radial gap G1 between the motor housing 31 and the cylindrical member 60. In this embodiment, the gap G1 includes the gap between the radially outer surface of the stator fixing portion 61 and the radially inner surface of the opposing portion 34c, the gap between the radially outer surface of the first connecting portion 63a and the radially inner surface of the opposing portion 34c, the gap between the radially outer surface of the second connecting portion 63b and the radially inner surface of the opposing portion 34c, and the gap between the radially outer surface of the second supported portion 62b at its axial side (+Y side) end and the radially inner surface of the opposing portion 34c. The gap G1 is formed by surrounding the opposing portion 34c, the second supported portion 34b, the stator fixing portion 61, the first supported portion 62a, and the second supported portion 62b. The gap G1 is annular, surrounding the cylindrical member 60. In this embodiment, the gap G1 is annular, centered on the central axis J.

[0077] A pump 85a and a cooler 85b are provided midway through the flow path 80. The pump 85a and the cooler 85b are mounted on the housing 30. The pump 85a is an electric pump. The flow path 80 has a first connecting flow path section 81, a second connecting flow path section 82, a third connecting flow path section 83, and a supply flow path section 84.

[0078] The first connecting flow path 81 connects the interior of the storage section 39 to the pump 85a. In this embodiment, the first connecting flow path 81 is provided on the bottom wall of the gear housing 32. The second connecting flow path 82 connects the pump 85a to the cooler 85b. In this embodiment, the second connecting flow path 82 is provided on the bottom wall of the motor housing 31. The third connecting flow path 83 connects the cooler 85b to the supply flow path 84. In this embodiment, the third connecting flow path 83 extends from the bottom wall of the motor housing 31 through the motor cover 31b to the upper end of the motor cover 31b.

[0079] A supply flow path 84 is provided in the upper portion of the peripheral wall portion 31a. The supply flow path 84 extends axially. The supply flow path 84 is provided with a supply hole 84a. The supply hole 84a connects the interior of the supply flow path 84 to the interior of the motor housing 31. The supply hole 84a opens radially inward on the upper portion of the peripheral wall portion 31a. The supply hole 84a opens downward toward the gap G1. A plurality of supply holes 84a are provided at axial intervals. In this embodiment, three supply holes 84a are provided.

[0080] Driven by pump 85a, oil O in storage section 39 flows sequentially through first connecting flow path 8, second connecting flow path 82, and third connecting flow path 83, and then into supply flow path 84. Oil O flowing into supply flow path 84 is discharged from multiple supply holes 84a to the upper end of gap G1. Oil O discharged into gap G1 is supplied to the radially outer surfaces of stator fixing part 61, first connecting part 63a, and second connecting part 63b, cooling the stator 50 located radially inner to the cylindrical member 60. Within gap G1, oil O flows circumferentially and downwards along the radially outer surfaces of stator fixing part 61, first connecting part 63a, and second connecting part 63b. Oil O flowing to the lower end of gap G1 returns to storage section 39 via flow path 86 connecting gap G1 and gear housing 32. The flow path 86 penetrates the dividing wall 33 in the axial direction.

[0081] Hereinafter, embodiments different from the embodiments described above will be described. In the following descriptions of each embodiment, for structures that are the same as those described above in the descriptions of each embodiment, descriptions are sometimes omitted by appropriately using the same symbols, etc. Furthermore, for parts corresponding to each part of the structures described above in the descriptions of each embodiment, different symbols are used while assigning the same names, and the differences from the above structures are described, while the similarities with the above structures are sometimes omitted. In addition, in each of the following embodiments, as structures for which descriptions are omitted, structures that are the same as those described above in the descriptions of each embodiment may be used to the extent that there is no contradiction.

[0082] <Second Implementation> like Figure 4 As shown, in the rotary motor 210 of the drive device 200 of this embodiment, the shape of the cylindrical member 260 is different from that of the rotary motor 10 of the first embodiment. In the cylindrical member 260 of this embodiment, the stator fixing portion 261 is located further radially inward than the stator fixing portion 61 of the first embodiment. The radially inner surface of the stator fixing portion 261 is located further radially inward than the radially inner surface of the first supported portion 62a and the second supported portion 62b. The radially outer surface of the stator fixing portion 261 is located further radially inward than the radially outer surface of the first connecting portion 263a and the second connecting portion 263b.

[0083] The radially inner surface of the first connecting portion 263a is located radially outer than the radially inner surface of the stator fixing portion 261, and radially inner than the radially inner surface of the first supported portion 62a. In this embodiment, the radial dimension T3c of the wall constituting the first connecting portion 263a is smaller than the radial dimension T1 of the wall constituting the stator fixing portion 261. Therefore, the rigidity of the first connecting portion 263a can be further reduced, making it more prone to vibration. Consequently, it is easier to appropriately attenuate vibrations generated at the stator 50 at the first connecting portion 263a. Therefore, vibrations of the housing 30 can be more appropriately suppressed.

[0084] In this embodiment, the first connecting portion 263a has a bent portion 263c that bends radially from the stator fixing portion 261. Therefore, compared to the case where the first connecting portion 263a is connected axially in a straight line relative to the stator fixing portion 261, the first connecting portion 263a is more prone to vibration in the axial direction. As a result, when vibration is transmitted to the first connecting portion 263a, it is easy to cause the first connecting portion 263a to vibrate more significantly, and the vibration can be further attenuated at the first connecting portion 263a. Therefore, the vibration of the housing 30 can be further appropriately suppressed. In this embodiment, the bent portion 263c bends radially outward from the stator fixing portion 261. Alternatively, the bent portion 263c may also bend radially inward from the stator fixing portion 261.

[0085] The radially inner surface of the second connecting portion 263b is located radially outer than the radially inner surface of the stator fixing portion 261, and radially inner than the radially inner surface of the second supported portion 62b. In this embodiment, the radial dimension T3d of the wall constituting the second connecting portion 263b is smaller than the radial dimension T1 of the wall constituting the stator fixing portion 261. Therefore, the rigidity of the second connecting portion 263b can be further reduced, and the second connecting portion 263b can be made more prone to vibration. As a result, it is easier to properly attenuate the vibration generated at the stator 50 at the second connecting portion 263b. Therefore, the vibration of the housing 30 can be further properly suppressed.

[0086] In this embodiment, the second connecting portion 263b has a bent portion 263d that bends radially from the stator fixing portion 261. Therefore, compared to the case where the second connecting portion 263b is directly connected to the stator fixing portion 261 in the axial direction, the second connecting portion 263b is more prone to vibration in the axial direction. As a result, when vibration is transmitted to the second connecting portion 263b, it is easy to cause the second connecting portion 263b to vibrate more significantly, and the vibration can be further attenuated at the second connecting portion 263b. Therefore, the vibration of the housing 30 can be further appropriately suppressed. In this embodiment, the bent portion 263d bends radially outward from the stator fixing portion 261. Alternatively, the bent portion 263d may also bend radially inward from the stator fixing portion 261.

[0087] The other structures of the cylindrical member 260 are the same as those of the cylindrical member 60 in the first embodiment. The other structures of the rotary motor 210 are the same as those of the rotary motor 10 in the first embodiment. The other structures of the drive device 200 are the same as those of the drive device 100 in the first embodiment.

[0088] <Third Implementation Method> like Figure 5 As shown, in the rotary motor 310 of the drive device 300 of this embodiment, the cylindrical member 360 has a through hole 367 provided in the stator fixing part 361. The through hole 367 extends radially from the radially outer side to the radially inner side at the upper end of the stator fixing part 361. The through hole 367 is, for example, a circular hole. A plurality of through holes 367 are provided at intervals in the axial direction. In this embodiment, two through holes 367 are provided. Figure 6 As shown, the through hole 367 connects the gap G1 between the motor housing 31 and the cylindrical member 360 to the interior of the cylindrical member 360. The through hole 367 is connected to the gap G2, which will be described later. The through hole 367 is positioned to overlap with the supply hole 84a when viewed radially. In this embodiment, the through hole 367 is positioned opposite to the lower side of the supply hole 84a.

[0089] like Figure 5As shown, in this embodiment, the radially inner surface of the stator fixing part 361 is provided with a first protrusion 368 protruding radially inward. For example... Figure 6 As shown, the first protrusion 368 protrudes towards the radially outer surface of the stator core 51 and is a protrusion that contacts the radially outer surface of the stator core 51. Multiple first protrusions 368 are provided. The multiple first protrusions 368 are arranged at intervals along the circumference. The multiple first protrusions 368 are arranged within a full circumference.

[0090] In this embodiment, the radially inner surfaces of the plurality of first protrusions 368 contact the radially outer surfaces of the stator core 51, thereby holding the stator core 51 inside the cylindrical member 360. The stator core 51 is fixed to the cylindrical member 360, for example, by being pressed into the radially inner surfaces of the plurality of first protrusions 368 arranged circumferentially. By providing the plurality of first protrusions 368, a gap G2 is provided between the radially outer surfaces of the stator core 51 and the radially inner surfaces of the stator fixing portion 361. Therefore, by allowing oil O or the like to flow through the gap G2, the oil O can directly contact the radially outer surfaces of the stator core 51. This allows for easy cooling of the stator core 51 via the oil O. Therefore, the cooling efficiency of the stator 50 can be improved.

[0091] In this embodiment, the stator fixing part 361 is provided with a through hole 367 that connects the gap G1 between the motor housing 31 and the cylindrical member 360 and the interior of the cylindrical member 360. Therefore, at least a portion of the oil O flowing into the gap G1 from the supply hole 84a of the supply flow path part 84 flows through the through hole 367 into the interior of the cylindrical member 360. As a result, the oil O flowing into the interior of the cylindrical member 360 flows in the gap G2, and the stator core 51 can be cooled by the oil O.

[0092] Furthermore, in this embodiment, the stator core portion 51 corresponds to a core body portion that is disposed radially inward from the radially inner side surface of the stator fixing portion 361. That is, the stator core portion 51 has a core body portion, and in this embodiment, it is constituted by a core body portion.

[0093] In this embodiment, the plurality of first protrusions 368 include a plurality of first protrusions 368a, a plurality of first protrusions 368b, a plurality of first protrusions 368c, and a plurality of first protrusions 368d. First protrusions 368a and 368b are located on the radially inner surface of the stator fixing portion 361 at a position forward (+X side) from the central axis J. First protrusions 368c and 368d are located on the radially inner surface of the stator fixing portion 361 at a position forward (-X side) from the central axis J. First protrusions 368a and 368c are identical in structure except that they have a circumferentially symmetrical shape. First protrusions 368b and 368d are identical in structure except that they have a circumferentially symmetrical shape. In the following description, the first protrusion 368a and the first protrusion 368b will be described, while the description of the first protrusion 368c and the first protrusion 368d may be omitted at times.

[0094] like Figure 5 As shown, first protrusions 368a and 368b are alternately arranged in the circumferential direction. First protrusions 368a and 368b are adjacent first protrusions 368 in the circumferential direction. When viewed radially, first protrusions 368a and 368b are approximately trapezoidal, longer in the axial direction. The circumferential dimension of first protrusion 368a decreases towards the opposite axial side (-Y side). The circumferential dimension of first protrusion 368b decreases towards one axial side (+Y side). First protrusion 368a protrudes further towards one axial side than first protrusion 368b. First protrusion 368b protrudes further towards the opposite axial side than first protrusion 368a. In this embodiment, the portion of first protrusion 368a on the opposite axial side and the portion of first protrusion 368b on one axial side are circumferentially spaced apart.

[0095] like Figure 7 As shown, the first protrusion 368a has an inclined surface 368e extending in a direction that is obliquely inclined circumferentially relative to the axial direction. The first protrusion 368b has an inclined surface 368f extending in a direction that is obliquely inclined circumferentially relative to the axial direction. Therefore, the oil O flowing into the gap G2 can easily flow axially along the inclined surfaces 368e and 368f. As a result, the range of the radially outer surface of the stator core 51 to which oil O is supplied can be increased axially, and the stator core 51 can be properly cooled over a large range axially. Therefore, the cooling efficiency of the stator 50 can be further improved.

[0096] The inclined surface 368e of the first protrusion 368a is the upper-facing surface of one of the two circumferential sides of the first protrusion 368a. The inclined surface 368e is the surface of the first protrusion 368a that is circumferentially closer to the through hole 367. The inclined surface 368f of the first protrusion 368b is the upper-facing surface of one of the two circumferential sides of the first protrusion 368b. The inclined surface 368f is the surface of the first protrusion 368b that is circumferentially closer to the through hole 367.

[0097] In the following description, the side where the upper end of the stator fixing part 361 is located relative to the lower end of the stator fixing part 361 in the circumferential direction is referred to as the "circumferential side", and the side where the lower end of the stator fixing part 361 is located relative to the upper end of the stator fixing part 361 in the circumferential direction is referred to as the "circumferential other side". The front portion of the stator fixing part 361, viewed from the axial side (+Y side), is the side that advances counterclockwise around the central axis J, i.e. Figure 6 The side towards which the arrow θ1 points (the +θ1 side) is the circumferential side. In the rear portion of the stator fixing part 361, the side that moves clockwise from the central axis J when viewed from the axial side is... Figure 6 The side that the arrow θ2 points to (the +θ2 side) is the circumferential side. Figure 7 middle, Figure 7 The upper side is the circumferential side (+θ1 side). Figure 7 The lower side is the other side of the circumference (-θ1 side).

[0098] like Figure 7 As shown, the inclined surface 368e of the first protrusion 368a is located on the other side of the circumference (-θ1 side) as it faces the other side of the axial direction (-Y side). The inclined surface 368f of the first protrusion 368b is located on the other side of the circumference as it faces one side of the axial direction (+Y side). That is, among the circumferentially adjacent first protrusions 368a and 368b, the inclined surface 368e of one first protrusion 368a is located on one side of the circumference (+θ1 side) as it faces one side of the axial direction, and the inclined surface 368f of the other first protrusion 368b is located on the other side of the circumference as it faces one side of the axial direction. Therefore, the slopes of the inclined surfaces 368e and 368f of the circumferentially adjacent first protrusions 368a and 368b are different. Thus, as Figure 7As indicated by the middle arrow, oil O flowing along the inclined surface 368e of the first protrusion 368a to the other side axially and circumferentially can flow along the inclined surface 368f of the first protrusion 368b adjacent to the other side circumferentially of the first protrusion 368a to one side axially and circumferentially. Thus, the oil O flowing from the through hole 367 into the gap G2 can alternately change its orientation axially along the inclined surfaces 368e and 368f as it moves towards the other side circumferentially, flowing in a zigzag pattern. This allows for proper cooling of the stator core 51 over a wide axial range via the oil O. Consequently, the cooling efficiency of the stator 50 can be further improved.

[0099] In this embodiment, the extension line EL1 of the inclined surface 368e of the first protrusion 368a extending axially to the other side (-Y side) passes through the end of the inclined surface 368f of the first protrusion 368b adjacent to the other circumferential side (-θ1 side) of the first protrusion 368a on the other side of the circumference. Therefore, oil O flowing along the inclined surface 368e can be easily supplied to the inclined surface 368f of the first protrusion 368b adjacent on the other circumferential side.

[0100] The extension line EL2 of the inclined surface 368f of the first protrusion 368b extending axially to one side (+Y side) passes through the end of the inclined surface 368e of the first protrusion 368a adjacent to the other circumferential side of the first protrusion 368b on the axial side. As a result, the oil O flowing along the inclined surface 368f can be easily supplied to the inclined surface 368e of the first protrusion 368a adjacent on the other circumferential side.

[0101] The faces of the first protrusion 368a with the inclined surfaces 368e on opposite sides of the circumferential direction extend straight along the axial direction. Similarly, the faces of the first protrusion 368b with the inclined surfaces 368f on opposite sides of the circumferential direction extend straight along the axial direction. Therefore, for example, when the cylindrical member 360 is manufactured by die forming using a mold, the first protrusions 368a and 368b can be manufactured more easily than when the faces of the first protrusions 368a and 368b with the inclined surfaces 368e and 368f on opposite sides of the circumferential direction are made to extend in an axially inclined direction. Thus, the cylindrical member 360 having the first protrusions 368a and 368b on its radially inner surfaces can be easily manufactured.

[0102] Oil O flowing along the plurality of first protrusions 368 to the lower end of the cylinder member 360 flows out through openings on both sides of the cylinder member 360 to the outside of the cylinder member 360. Oil O flowing out to the outside of the cylinder member 360 returns to the storage portion 39 in the gear housing 32, for example, through holes provided in the dividing wall portion 33.

[0103] The other structures of the cylindrical member 360 are the same as those of the cylindrical member 60 in the first embodiment. The other structures of the rotary motor 310 are the same as those of the rotary motor 10 in the first embodiment. The other structures of the drive device 300 are the same as those of the drive device 100 in the first embodiment.

[0104] Alternatively, in this embodiment, the first protrusion 368 may also be provided on the radially outer side of the stator core portion 51, which serves as the core body portion. In this case, the first protrusion 368 protrudes toward the radially inner side of the stator fixing portion 361 and contacts the radially inner side of the stator fixing portion 361.

[0105] <Fourth Implementation> like Figure 8 As shown, in the rotary motor 410 of the drive device 400 of this embodiment, the supply flow path 484 is a tubular member extending axially. The supply flow path 484 is located above the cylindrical member 460. The supply flow path 484 has a plurality of supply holes 484a opening downwards. The supply holes 484a open into the gap G1. The plurality of supply holes 484a are arranged at intervals along the axial direction. In this embodiment, two supply holes 484a are provided.

[0106] The stator fixing portion 461 of the cylindrical member 460 is provided with two through holes 467, similar to that in the third embodiment. The two through holes 467 are identical to the two through holes 367 in the third embodiment, except for their axial position. Each through hole 467 is positioned to overlap with each supply hole 484a when viewed radially. In this embodiment, each through hole 467 is positioned opposite the lower side of each supply hole 484a.

[0107] The stator fixing portion 461 has a plurality of first protrusions 468 arranged at intervals in the circumferential direction and a plurality of second protrusions 469 arranged at intervals in the circumferential direction. In this embodiment, the plurality of first protrusions 468 and the plurality of second protrusions 469 are generally rectangular plate-shaped protrusions extending in a direction obliquely inclined in the circumferential direction relative to the axial direction. The plate surfaces of the plurality of first protrusions 468 and the plate surfaces of the plurality of second protrusions 469 are surfaces facing the circumferential direction and extending in a direction obliquely inclined in the circumferential direction relative to the axial direction.

[0108] A plurality of first protrusions 468 are disposed on one axial side (+Y side) of the inner surface of the stator fixing portion 461. A plurality of second protrusions 469 are disposed on the other axial side (-Y side) of the inner surface of the stator fixing portion 461. That is, the plurality of second protrusions 469 are located on the other axial side than the plurality of first protrusions 468.

[0109] The plurality of first protrusions 468 include a plurality of first protrusions 468a and a plurality of first protrusions 468b. The first protrusions 468a and 468b are alternately arranged at intervals in the circumferential direction. The first protrusion 468a has an inclined surface 468e. The first protrusion 468b has an inclined surface 468f. The inclined surface 468e is the same as the inclined surface 368e in the third embodiment. The inclined surface 468f is the same as the inclined surface 368f in the third embodiment. That is, among the circumferentially adjacent first protrusions 468a and 468b, the inclined surface 468e of one first protrusion 468a is located on one side of the circumferential direction (+θ1 side) as it faces one side of the axial direction (+Y side), and the inclined surface 468f of the other first protrusion 468b is located on the other side of the circumferential direction (-θ1 side) as it faces one side of the axial direction. Therefore, similar to the third embodiment, the oil O flowing into the gap G2 can alternately change its orientation axially along the inclined surfaces 468e and 468f as it moves toward the opposite side circumferentially, and flow in a serrated pattern. This further improves the cooling efficiency of the stator 50. In this embodiment, at least a portion of the oil O flowing into the gap G1 from the supply hole 484a of one of the supply flow paths 484 flows into the gap G2 via the through hole 467 of one of the supply paths and flows along the plurality of first protrusions 468.

[0110] The circumferential position of the second protrusion 469 is the circumferential position between the circumferentially adjacent first protrusions 468. Therefore, for example, when the cylindrical member 460 is manufactured by die forming using a pair of axially combined molds, it is easy to manufacture multiple first protrusions 468 and multiple second protrusions 469 separately using each mold. Therefore, it is easy to manufacture a cylindrical member 460 having multiple first protrusions 468 and multiple second protrusions 469.

[0111] The plurality of second protrusions 469 include a plurality of second protrusions 469a and a plurality of second protrusions 469b. The second protrusions 469a and 469b are alternately arranged at intervals in the circumferential direction. The second protrusions 469a and 469b are second protrusions 469 adjacent in the circumferential direction. The second protrusion 469a has an inclined surface 469e. The second protrusion 469b has an inclined surface 469f. The inclined surface 469e is the same as the inclined surface 468e of the first protrusion 468a. The inclined surface 468f is the same as the inclined surface 468f of the first protrusion 468b. That is, among the circumferentially adjacent second protrusions 469, the inclined surface 469e of one second protrusion 469a is located on one circumferential side (-θ1 side) as it faces one axial side (+Y side), while the inclined surface 469f of the other second protrusion 469b is located on the other circumferential side (-θ1 side) as it faces one axial side. Therefore, similar to the first protrusion 468, the oil O flowing into the gap G2 can alternately change its orientation axially along the inclined surfaces 469e and 469f as it faces the other circumferential side and flow in a zigzag pattern. As a result, the cooling efficiency of the stator 50 can be further improved. In this embodiment, at least a portion of the oil O flowing into the gap G1 from the supply hole 484a of the other supply flow path 484 flows into the gap G2 through the other through hole 467 and flows along the plurality of second protrusions 469.

[0112] Thus, in this embodiment, the flow of oil O in the gap G2 between the stator core 51 and the cylinder member 460 can be configured as both oil O flow along the plurality of first protrusions 468 and oil O flow along the plurality of second protrusions 469. Therefore, the flow path length between the oil O flowing into the gap G2 and reaching the lower end of the stator fixing portion 461 can be shortened in each flow. This prevents the temperature of the oil O from becoming excessively high midway through its flow to the lower end of the stator fixing portion 461. Therefore, the stator core 51 can be properly cooled by the oil O during the period from its flow into the gap G2 to its flow to the lower end of the stator fixing portion 461. Therefore, the cooling efficiency of the stator 50 can be further improved.

[0113] The surfaces of the first protrusion 468a on the opposite sides of its circumferential side, opposite to the inclined surface 468e, extend in the same direction as the inclined surface 468e. The surfaces of the first protrusion 468b on the opposite sides of its circumferential side, opposite to the inclined surface 468f, extend in the same direction as the inclined surface 468f. The surfaces of the second protrusion 469a on the opposite sides of its circumferential side, opposite to the inclined surface 469e, extend in the same direction as the inclined surface 469e. The surfaces of the second protrusion 469b on the opposite sides of its circumferential side, opposite to the inclined surface 469f, extend in the same direction as the inclined surface 469f.

[0114] The other structures of the cylindrical member 460 are the same as those of the cylindrical member 360 in the third embodiment. The other structures of the rotary motor 410 are the same as those of the rotary motor 310 in the third embodiment. The other structures of the drive device 400 are the same as those of the drive device 300 in the third embodiment.

[0115] Alternatively, in this embodiment, the first protrusion 468 and the second protrusion 469 may also be provided on the radially outer side of the stator core portion 51, which serves as the core body portion. In this case, the second protrusion 469 protrudes toward the radially inner side of the stator fixing portion 461 and contacts the radially inner side of the stator fixing portion 461.

[0116] <Fifth Implementation> like Figure 9 As shown, in the rotary motor 510 of the drive device 500 of this embodiment, the stator fixing portion 561 of the cylindrical member 560 is provided with a first through hole 567 and a second through hole 568. The first through hole 567 extends radially from the radially outer side to the radially inner side at the upper end of the stator fixing portion 561. Although not shown in the figure, the first through hole 567 connects the gap G1 between the motor housing 31 and the cylindrical member 560 and the interior of the cylindrical member 560. The first through hole 567 is, for example, a circular hole. A plurality of first through holes 567 are provided at axial intervals. In this embodiment, four first through holes 567 are provided.

[0117] The second through hole 568 extends radially from the radially inner side to the radially outer side at the lower end of the stator fixing part 561. Although not shown in the figure, the second through hole 568 connects the gap G1 between the motor housing 31 and the cylindrical member 560 and the interior of the cylindrical member 560. The second through hole 568 is, for example, a circular hole. Multiple second through holes 568 are provided at axial intervals. In this embodiment, two second through holes 568 are provided. The two second through holes 568 are positioned to overlap with two of the four first through holes 567 when viewed radially. In this embodiment, the two first through holes 567 and the two second through holes 568 are positioned to overlap each other when viewed vertically.

[0118] In this embodiment, the radially inner surface of the stator fixing portion 561 is provided with a first groove 591 extending circumferentially. Therefore, the first groove 591 allows a gap to be formed between the radially outer surface of the stator core portion 51 and the radially inner surface of the stator fixing portion 561. Consequently, by allowing oil O or the like to flow through the first groove 591, the stator core portion 51 can be easily cooled. Therefore, the cooling efficiency of the stator 50 can be improved. Furthermore, since oil O can flow circumferentially through the first groove 591, the stator 50 can be easily cooled over a large circumferential range.

[0119] In this embodiment, the first groove 591 is annular, surrounding the central axis J. More specifically, the first groove 591 is annular, centered on the central axis J. Multiple first grooves 591 are spaced apart axially. In this embodiment, four first grooves 591 are provided. Each first through hole 567 is connected to each first groove 591. Two of the four first grooves 591, excluding the two located at the two axial ends, are connected to two second through holes 568. Oil O flowing from the first through hole 567 into the first groove 591 connected to the second through hole 568 flows circumferentially along the first groove 591 to its lower end and exits from the second through hole 568 to the outside of the cylindrical member 560.

[0120] In this embodiment, the radially inner surface of the stator fixing portion 561 is provided with a second groove 592 extending axially. Therefore, the second groove 592 allows a gap to be formed between the radially outer surface of the stator core portion 51 and the radially inner surface of the stator fixing portion 561. Consequently, by allowing oil O or the like to flow through the second groove 592, the stator core portion 51 can be easily cooled. Therefore, the cooling efficiency of the stator 50 can be improved. Furthermore, since oil O can flow axially through the second groove 592, the stator 50 can be easily cooled over a large axial range.

[0121] Multiple second grooves 592 are provided. These multiple second grooves 592 include second grooves 592a and second grooves 592b. Second groove 592a is a second groove 592 connected to the first groove 591 located on the axially closest side (+Y side) of the plurality of first grooves 591, and opens to the axial side. Second groove 592b is a second groove 592 connected to the first groove 591 located on the opposite axial side (-Y side) of the plurality of first grooves 591, and opens to the opposite axial side. Therefore, a portion of the oil O flowing into the first groove 591 located on the axially closest side can flow into the second groove 592a. Furthermore, a portion of the oil O flowing into the first groove 591 located on the opposite axial side can flow into the second groove 592b. Thus, in the radial gap between the stator core 51 and the cylinder member 560, the oil O can flow properly in both the circumferential and axial directions, making it easier to cool the stator core 51. Therefore, the cooling efficiency of stator 50 can be further improved.

[0122] Furthermore, the second groove 592a opens to one axial side (+Y side), so the oil O flowing out of the second groove 592a along the axial direction can be supplied to the coil end 53a, which protrudes further to one axial side than the stator core 51. The second groove 592b opens to the other axial side (-Y side), so the oil O flowing out of the second groove 592a along the axial direction can be supplied to the coil end 53b, which protrudes further to one axial side than the stator core 51. Therefore, the cooling efficiency of the stator 50 can be further improved.

[0123] Since the first grooves 591 located at both ends of the axial direction are not connected to the second through holes 568, the oil O flowing into the first grooves 591 does not flow out of the second through holes 568 to the outside of the cylindrical member 560. This allows the pressure of the oil O flowing into the first grooves 591 to increase, and this pressure allows the oil O in the first grooves 591 to flow into the second grooves 592. Therefore, the oil O can be properly directed to flow into the second grooves 592.

[0124] The second groove 592a extends axially from the first groove 591 located on the axially closest side (+Y side). Multiple second grooves 592a are provided at circumferential intervals. The multiple second grooves 592a are located on the radially inner side of the stator fixing portion 561, at a position higher than the central axis J. In this embodiment, four second grooves 592a are provided. Each second groove 592a is positioned at a different circumferential position than the first through hole 567.

[0125] The second groove 592b extends from the first groove 591, located on the opposite side of the axial direction (-Y side), to the other side of the axial direction. Multiple second grooves 592b are provided at intervals in the circumferential direction. The multiple second grooves 592b are located on the radially inner surface of the stator fixing portion 561, at a position higher than the central axis J. In this embodiment, four second grooves 592b are provided. Each second groove 592b is positioned to overlap with each second groove 592a when viewed axially. Each second groove 592b is positioned at a different position in the circumferential direction from the first through hole 567.

[0126] In this embodiment, a plurality of radially inwardly protruding wall portions are provided on the radially inner side of the stator fixing portion 561, and a first groove portion 591 and a second groove portion 592 are formed between these plurality of wall portions. Alternatively, the first groove portion 591 and the second groove portion 592 may be formed by recesses that are recessed radially inward, without providing radially inwardly protruding wall portions.

[0127] The other structures of the cylindrical member 560 are the same as those of the cylindrical member 60 in the first embodiment. The other structures of the rotary motor 510 are the same as those of the rotary motor 10 in the first embodiment. The other structures of the drive device 500 are the same as those of the drive device 100 in the first embodiment.

[0128] In addition, in this embodiment, the first groove 591 and the second groove 592 may also be provided on the radially outer side of the stator core 51, or on both the radially inner side of the stator fixing part 561 and the radially outer side of the stator core 51.

[0129] This invention is not limited to the embodiments described above. Other structures and methods can also be employed within the scope of the technical concept of this invention. The stator fixing portion only needs to be arranged so that at least a portion separates radially inward from the inner surface of the housing (motor housing). That is, a portion of the stator fixing portion can also contact the inner surface of the housing. The first connecting portion only needs to be arranged so that at least a portion separates radially inward from the inner surface of the housing. That is, a portion of the first connecting portion can also contact the inner surface of the housing. The second connecting portion only needs to be arranged so that at least a portion separates radially inward from the inner surface of the housing. That is, a portion of the second connecting portion can also contact the inner surface of the housing.

[0130] Furthermore, an adhesive or other substance other than air may be provided between the inner surfaces of the stator fixing part and the receiving part, between the inner surfaces of the first connecting part and the receiving part, and between the inner surfaces of the second connecting part and the receiving part. That is, in the above embodiment, at least a portion of the gap G1 may also be provided with an adhesive or the like.

[0131] The dimensions of the stator fixing part, the first supported part, the first connecting part, the second supported part, and the second connecting part are not particularly limited. The materials constituting the first connecting part and the second connecting part may also differ from the materials constituting the stator fixing part, the first supported part, and the second supported part. In this case, the materials constituting the first connecting part and the second connecting part may also be materials with lower rigidity compared to the materials constituting the stator fixing part, the first supported part, and the second supported part. The first supported part and the second supported part can be supported by the receiving part in any way. The first supported part and the second supported part can be fixed to the receiving part by threaded members such as screws, or they can be fixed to the receiving part by adhesive. The first supported part and the second supported part can also be supported by abutting against the receiving part. Alternatively, the second supported part and the second connecting part may not be provided.

[0132] The application of the drive device used in this invention is not particularly limited. For example, the drive device can be installed in a vehicle for purposes other than rotating the axle, or in equipment other than a vehicle. The rotary motor using this invention is not limited to a motor, but can also be a generator. The application of the rotary motor is not particularly limited. The rotary motor can be installed in equipment other than a vehicle. The posture when using the rotary motor is not particularly limited. The central axis of the rotary motor can extend in any direction.

[0133] In addition, this technology can adopt the following structure. (1) A rotary electric motor comprising: a rotor rotatable about a central axis; a stator located radially outward of the rotor; a cylindrical member located radially outward of the stator and housing the stator therein; and a housing having a housing portion housing the rotor, the stator, and the cylindrical member therein, the cylindrical member having: a stator fixing portion for fixing the stator; a first supported portion located axially closer to the stator fixing portion and supported by the housing portion; and a first connecting portion located axially between the stator fixing portion and the first supported portion and connecting the stator fixing portion and the first supported portion, wherein at least a portion of the stator fixing portion and at least a portion of the first connecting portion are arranged radially inward from the inner surface of the housing portion. (2) In the rotary motor described in (1), the stator fixing part and the first connecting part are arranged radially inward from the inner surface of the receiving part. (3) In the rotary motor described in (1) or (2), the radial dimension of at least a portion of the wall portion constituting the first connecting portion is less than or equal to the radial dimension of the wall portion constituting the first supported portion and the radial dimension of the wall portion constituting the stator fixing portion. (4) In the rotary motor described in (3), the radial dimension of the wall portion constituting the first connecting portion is smaller than the radial dimension of the wall portion constituting the first supported portion. (5) In the rotary motor described in (4), the radial dimension of the wall portion constituting the stator fixing portion is smaller than the radial dimension of the wall portion constituting the first supported portion, and the radial dimension of the wall portion constituting the first connecting portion is the same as the radial dimension of the wall portion constituting the stator fixing portion. (6) In the rotary motor described in (4), the radial dimension of the wall portion constituting the stator fixing portion is smaller than the radial dimension of the wall portion constituting the first supported portion, and the radial dimension of the wall portion constituting the first connecting portion is smaller than the radial dimension of the wall portion constituting the stator fixing portion. (7) In any of (1) to (6) of the rotary motor, the first connecting portion has a buckled portion that buckles radially from the stator fixing portion. (8) In any of (1) to (7) of the rotary motor, the cylindrical member has: a second supported portion located on the axial side opposite to the stator fixing portion and supported by the receiving portion; and a second connecting portion located between the stator fixing portion and the second supported portion in the axial direction and connecting the stator fixing portion and the second supported portion, wherein at least a portion of the second connecting portion is arranged radially inward from the inner surface of the receiving portion. (9) In the rotary motor described in (8), the second connecting part is disposed radially inward from the inner surface of the receiving part. (10) In any of (1) to (9) of the rotary motor, the receiving part has a support portion surrounding the first supported part, the first supported part being fitted into the support portion. (11) In any of (1) to (10) of the rotary motor, the stator has a stator core, the radially outer surface of the stator core being in contact with the radially inner surface of the stator fixing portion over a full circumference around the central axis. (12) In any of (1) to (10) the rotary motor, the stator has a stator core, and a gap is provided between the radially outer side surface of the stator core and the radially inner side surface of the stator fixing part. (13) In the rotary motor described in (12), the stator core has a core body portion disposed integrally away from the radially inner side of the stator fixing portion. A protrusion is provided on one of the radially outer side of the core body portion and the radially inner side of the stator fixing portion. The protrusion protrudes toward and contacts the other of the radially outer side of the core body portion and the radially inner side of the stator fixing portion. The protrusion has an inclined surface that extends in a direction that is obliquely inclined circumferentially relative to the axial direction. (14) In the rotary motor described in (13), the protrusion is provided in a plurality of ways, the protrusion including a plurality of first protrusions arranged at intervals in the circumferential direction, in the circumferentially adjacent first protrusions, the inclined surface of one first protrusion is located on one side of the circumferential direction as it faces one side of the axial direction, and the inclined surface of the other first protrusion is located on the other side of the circumferential direction as it faces one side of the axial direction. (15) In the rotary motor described in (14), the plurality of protrusions include a plurality of second protrusions arranged circumferentially spaced apart, the plurality of second protrusions being located on the opposite side of the axial direction from the plurality of first protrusions, in the circumferentially adjacent second protrusions, the inclined surface of one second protrusion is located on one circumferential side as it faces the axial direction, and the inclined surface of the other second protrusion is located on the opposite circumferential side as it faces the axial direction. (16) In the rotary motor described in (15), the circumferential position of the second protrusion is the circumferential position of the first protrusions that are circumferentially adjacent to each other. (17) In the rotary motor described in (12), at least one of the radial inner side of the stator fixing part and the radial outer side of the stator core part is provided with a first groove extending in the circumferential direction. (18) In the rotary motor described in (12), at least one of the radial inner side of the stator fixing part and the radial outer side of the stator core part is provided with a second groove extending in the axial direction. (19) In the rotary motor described in (12), at least one of the radially inner side surface of the stator fixing portion and the radially outer side surface of the stator core portion is provided with: a plurality of first slots extending in the circumferential direction and spaced apart in the axial direction; and a plurality of second slots extending in the axial direction, the plurality of second slots including: a second slot connected to the first slot located on the axial side of the plurality of first slots and opening to the axial side; and a second slot connected to the first slot located on the other axial side of the plurality of first slots and opening to the other axial side. (20) A drive device that rotates the axle of a vehicle, comprising: a rotary motor as described in any one of (1) to (19); and a gear mechanism connected to the rotary motor.

[0134] The structures and methods described above can be appropriately combined within a range that do not contradict each other. (Symbol Explanation)

[0135] 10, 210, 310, 410, 510 Rotary motor; 20 Gear mechanism; 30 Housing; 31 Motor housing (storage part); 34a First support part (support part); 40 Rotor; 50 Stator; 51 Stator core part (core body part); 60, 260, 360, 460, 560 Cylindrical component; 61, 261, 361, 461, 561 Stator fixing part; 62a First supported part; 62b Second supported part; 63a, 263a First connecting part; 63b, 263b Second connecting part; 1 00, 200, 300, 400, 500 drive units; 263c, 263d buckling portions; 368, 368a, 368b, 368c, 368d, 468, 468a, 468b first protrusions (protrusions); 368e, 368f, 468e, 468f, 469e, 469f inclined surfaces; 469, 469a, 469b second protrusions (protrusions); 591 first groove; 592, 592a, 592b second grooves; DS axle; J… center axis.

Claims

1. A rotary electric motor, characterized in that, have: A rotor that can rotate about a central axis; A stator, located radially outside the rotor; A cylindrical member, located radially outside the stator and housing the stator internally; as well as The housing has a receiving portion for internally housing the rotor, the stator, and the cylindrical component. The cylindrical component has: A stator fixing part, wherein the stator is fixed in the stator fixing part; The first supported part is located on the axial side of the stator fixing part and is supported by the storage part. as well as A first connecting portion is located axially between the stator fixing portion and the first supported portion, connecting the stator fixing portion and the first supported portion. At least a portion of the stator fixing portion and at least a portion of the first connecting portion are arranged radially inward from the inner surface of the receiving portion.

2. The rotary motor according to claim 1, characterized in that, The stator fixing part and the first connecting part are arranged radially inward from the inner surface of the receiving part.

3. The rotary motor according to claim 1, characterized in that, The radial dimension of at least a portion of the wall portion constituting the first connecting portion is less than or equal to the radial dimension of the wall portion constituting the first supported portion and the radial dimension of the wall portion constituting the stator fixing portion.

4. The rotary motor according to claim 3, characterized in that, The radial dimension of the wall portion constituting the first connecting portion is smaller than the radial dimension of the wall portion constituting the first supported portion.

5. The rotary motor according to claim 4, characterized in that, The radial dimension of the wall portion constituting the stator fixing part is smaller than the radial dimension of the wall portion constituting the first supported part. The radial dimension of the wall portion constituting the first connecting portion is the same as the radial dimension of the wall portion constituting the stator fixing portion.

6. The rotary motor according to claim 4, characterized in that, The radial dimension of the wall portion constituting the stator fixing part is smaller than the radial dimension of the wall portion constituting the first supported part. The radial dimension of the wall portion constituting the first connecting portion is smaller than the radial dimension of the wall portion constituting the stator fixing portion.

7. The rotary motor according to claim 1, characterized in that, The first connecting portion has a buckled portion that bends radially from the stator fixing portion.

8. The rotary electric motor according to any one of claims 1 to 7, characterized in that, The cylindrical component has: The second supported part is located on the axial side opposite to the stator fixing part and is supported by the storage part; as well as The second connecting portion is located axially between the stator fixing portion and the second supported portion, and connects the stator fixing portion and the second supported portion. At least a portion of the second connecting portion is disposed radially inward from the inner surface of the receiving portion.

9. The rotary electric motor according to claim 8, characterized in that, The second connecting portion is disposed radially inward from the inner surface of the receiving portion.

10. The rotary electric motor according to any one of claims 1 to 7, characterized in that, The storage section has a support section that surrounds the first supported section. The first supported portion is fitted into the support portion.

11. The rotary electric motor according to any one of claims 1 to 7, characterized in that, The stator has a stator core. The radially outer surface of the stator core contacts the radially inner surface of the stator fixing part over a full circumference around the central axis.

12. The rotary electric motor according to any one of claims 1 to 7, characterized in that, The stator has a stator core. A gap is provided between the radial outer surface of the stator core and the radial inner surface of the stator fixing part.

13. The rotary electric motor according to claim 12, characterized in that, The stator core has a core body portion that is integrally disposed radially inward from the radially inner side of the stator fixing portion. A protrusion is provided on one of the radially outer surface of the core body and the radially inner surface of the stator fixing part. The protrusion protrudes toward and contacts the other surface of the radially outer surface of the core body and the radially inner surface of the stator fixing part. The protrusion has an inclined surface that extends along a direction that is obliquely inclined circumferentially relative to the axial direction.

14. The rotary electric motor according to claim 13, characterized in that, The protrusions are provided in multiple portions. The protrusions include a plurality of first protrusions arranged at circumferential intervals. In the first protrusion that is circumferentially adjacent, The inclined surface of the first protrusion of one side is located on the circumferential side as it faces the axial side. The inclined surface of the first protrusion on the other side is located on the other side of the circumference as it faces one side of the axial direction.

15. The rotary electric motor according to claim 14, characterized in that, The plurality of protrusions includes a plurality of second protrusions arranged at circumferential intervals. The plurality of second protrusions are located on the opposite side of the axial direction compared to the plurality of first protrusions. In the second protrusion that is circumferentially adjacent, The inclined surface of the second protrusion on one side is located on the circumferential side as it faces the axial side. The inclined surface of the second protrusion on the other side is located on the other side of the circumference as it faces one side of the axial direction.

16. The rotary electric motor according to claim 15, characterized in that, The circumferential position of the second protrusion is the circumferential position of the first protrusions that are circumferentially adjacent to each other.

17. The rotary electric motor according to claim 12, characterized in that, At least one of the radial inner surface of the stator fixing part and the radial outer surface of the stator core part is provided with a first groove extending in the circumferential direction.

18. The rotary electric motor according to claim 12, characterized in that, At least one of the radial inner side of the stator fixing part and the radial outer side of the stator core part is provided with a second groove extending in the axial direction.

19. The rotary electric motor according to claim 12, characterized in that, At least one of the radial inner surface of the stator fixing part and the radial outer surface of the stator core part is provided with: A plurality of first grooves extending circumferentially and spaced apart axially; as well as Multiple second grooves extending axially. The plurality of second grooves include: A second groove that is connected to the first groove located on the axial side of the plurality of first grooves and opens to the axial side; as well as A second groove that is connected to the first groove located on the opposite side of the axial direction among the plurality of first grooves and opens to the opposite side of the axial direction.

20. A driving device, The drive unit rotates the vehicle's axle, characterized in that, have: The rotary electric motor according to any one of claims 1 to 7; and A gear mechanism, which is connected to the rotary motor.

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