JP2024006098A - Rotary electric machine and drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine having high durability, and to provide a drive device.

SOLUTION: A rotary electric machine includes: a rotor which may rotate around a center axis; a stator 40 disposed at the radial outer side of the rotor; and a housing 10 which houses the rotor and the stator 40 therein. The stator 40 has a stator core 41 which encloses the rotor from the radial outer side. The housing 10 has a peripheral wall part 12 which encloses the stator 40 from the radial outer side. The peripheral wall part 12 includes: a fixed surface 12b which comes into contact with an outer peripheral surface of the stator core 41 and extends in a circumferential direction; a holding part 60 which is located closer to at least one side in an axial direction than the fixed surface 12b and extends in the circumferential direction; and a passage 50 located at the radial outer side of the fixed surface 12b. Sealing parts 95 each of which extends in the circumferential direction and seals a space between the peripheral wall part 12 and the stator core 41 are provided at both axial sides of the fixed surface 12b. At least one of the sealing parts 95 is held by the holding part 60.

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a rotating electrical machine and a drive device.

BACKGROUND ART In recent years, there has been active development of rotating electric machines for driving purposes that are mounted on vehicles such as electric cars. Such a rotating electric machine is equipped with a cooling structure. Patent Document 1 discloses a structure in which a housing that holds a stator is provided with a water channel through which cooling water flows, and the rotating electric machine is cooled by the housing.

Japanese Patent Application Publication No. 2007-143246

Rotating electrical machines installed in electric vehicles and the like described above are required to have high durability so that they can withstand rough roads and various climatic conditions.

In view of the above circumstances, one object of the present invention is to provide a highly durable rotating electrical machine and a drive device including such a rotating electrical machine.

One aspect of the rotating electric machine of the present invention includes a rotor rotatable around a central axis, a stator disposed radially outside the rotor, and a housing housing the rotor and the stator therein. . The stator has a stator core that surrounds the rotor from the outside in a radial direction. The housing has a peripheral wall portion that surrounds the stator from the outside in a radial direction. The peripheral wall portion includes a fixing surface that contacts the outer circumferential surface of the stator core and extends in the circumferential direction, a holding portion located on at least one side of the fixing surface in the axial direction and extending in the circumferential direction, and a diameter of the fixing surface. A flow path located on the outside in the direction. Sealing portions that extend in the circumferential direction and seal between the peripheral wall portion and the stator core are provided on both sides of the fixed surface in the axial direction. At least one of the sealing parts is held by the holding part.

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

According to one aspect of the present invention, the durability of the rotating electric machine and the drive device can be increased.

FIG. 1 is a schematic diagram showing a drive device according to a first embodiment. FIG. 2 is a sectional view showing a part of the drive device of the first embodiment. FIG. 3A is a cross-sectional view showing a stator fixing process of the drive device of the first embodiment. FIG. 3B is another cross-sectional view showing the stator fixing process of the drive device of the first embodiment. FIG. 3C is a sectional view showing another stator fixing process of the drive device of the first embodiment. FIG. 3D is another cross-sectional view showing another stator fixing process of the drive device of the first embodiment. FIG. 4 is a sectional view showing a part of the drive device of the second embodiment. FIG. 5 is a sectional view showing a part of the drive device of the third embodiment. FIG. 6 is a cross-sectional view showing a part of the drive device of the fourth embodiment. FIG. 7 is a sectional view showing a part of the drive device of the fifth embodiment. FIG. 8 is a cross-sectional view showing a part of the drive device of the sixth embodiment. FIG. 9 is a sectional view showing a part of the drive device of the seventh embodiment. FIG. 10 is a sectional view showing a part of the drive device of the eighth embodiment.

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

In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction is the vertical direction. The side toward which the Z-axis arrow points (+Z side) is the vertically upper side, and the side opposite to the side toward which the Z-axis arrow points (-Z side) is the vertically lower side. In the following description, the upper side in the vertical direction is simply referred to as the "upper side", and the lower side in the vertical direction is simply referred to as the "lower side".

The central axis J1 shown in the figures as appropriate is a virtual axis extending in a direction intersecting the vertical direction. More specifically, the central axis J1 extends in the Y-axis direction perpendicular to the vertical direction. In the following description, unless otherwise specified, the direction parallel to the central axis J1 is simply referred to as the "axial direction", the radial direction centered on the central axis J1 is simply referred to as the "radial direction", and the central axis J1 is referred to as the "radial direction". The circumferential direction around the center is simply called the "circumferential direction." The side of the axis where the Y-axis arrow points (+Y side) is called the "one axial side", and the side opposite to the direction of the Y-axis arrow (-Y side) is called the "other axial side". ”. Arrows θ shown in the figures as appropriate indicate the circumferential direction.

In the following explanation, "the surface faces the A direction" means that the surface extends strictly in a direction perpendicular to the A direction, and in addition to the case where the surface strictly faces the A direction, the direction in which the surface faces has a component in the A direction. This also includes cases where it has. Furthermore, "the surface faces B and A directions" means that the surface extends strictly in a direction perpendicular to the A direction, and in addition to the case where the surface strictly opposes the B and A directions, the direction in which the surface faces is It has an A direction component, and includes cases where the surface and B overlap when viewed in the A direction.

<First embodiment>
FIG. 1 is a schematic diagram showing a drive device 1 of this embodiment. Note that FIG. 1 is only a schematic diagram, and does not accurately illustrate the arrangement of each part and the dimensions of each part.

The drive device 1 of this embodiment is a drive device that is mounted on a vehicle and rotates the axle of the vehicle. The vehicle in which the drive device 1 is mounted is a vehicle that uses a rotating electric machine as a power source, such as a hybrid vehicle (HEV), a plug-in hybrid vehicle (PHV), or an electric vehicle (EV).

The drive device 1 includes a rotating electrical machine 2 and a transmission mechanism 3. The rotating electric machine 2 is a part that generates power. Further, the rotating electric machine 2 may have a function as a generator. The transmission mechanism 3 is a part that is connected to the rotating electrical machine 2 and transmits the power generated by the rotating electrical machine 2 to the output shaft 6.

The rotating electric machine 2 includes a rotor 30, a stator 40, a housing 10, bearings 71 and 73, an inverter 8, a connecting member 90, a sealing part 95, and a fluid L. An accommodation space 18 is provided inside the housing 10 to accommodate the rotating electric machine 2 and the transmission mechanism 3. The accommodation space 18 is divided into a motor chamber 18a that accommodates the rotor 30 and the stator 40, a transmission mechanism chamber 18b that accommodates the transmission mechanism 3, and an inverter chamber 18c that accommodates the inverter 8. The motor chamber 18a is an internal space of the motor accommodating portion 10a. The transmission mechanism chamber 18b is an internal space of the transmission mechanism housing section 10b. The inverter chamber 18c is an internal space of the inverter housing section 10c.

The rotor 30 is rotatable about the central axis J1. The rotor 30 has a shaft 31 and a rotor body 32. The power of the rotor 30 is transmitted to the transmission mechanism 3.

The shaft 31 extends in the axial direction centering on the central axis J1. The shaft 31 is arranged astride the motor chamber 18a and the transmission mechanism chamber 18b. The other end of the shaft 31 in the axial direction (-Y side) projects from the motor chamber 18a to the transmission mechanism chamber 18b. The shaft 31 is rotatably supported by bearings 71 and 73 about the central axis J1. The bearings 71 and 73 are, for example, ball bearings.

The rotor main body 32 is fixed to the outer peripheral surface of the shaft 31. Although not shown, the rotor main body 32 includes a rotor core and a plurality of rotor magnets fixed to the rotor core. The rotor core has a cylindrical shape extending along the axial direction. The plurality of rotor magnets are arranged along the circumferential direction with alternating magnetic poles.

Stator 40 is arranged radially outside of rotor 30. Stator 40 is fixed to the inner surface of housing 10. Stator 40 includes a stator core 41 and a plurality of coils 42.

The stator core 41 has a substantially annular shape that surrounds the rotor 30 from the outside in the radial direction. The outer peripheral surface of the stator core 41 is fixed to a fixing surface 12b of the housing 10, which will be described later. The plurality of coils 42 are attached to the stator core 41 via an insulator (not shown). The plurality of coils 42 are arranged at intervals along the circumferential direction.

The inverter 8 is housed inside the inverter housing section 10c. Inverter 8 is electrically connected to an external power source and coil 42 (not shown). Inverter 8 supplies power to stator 40 .

Connection member 90 electrically connects inverter 8 and stator 40. The connecting member 90 extends substantially vertically (Z-axis direction). The connecting member 90 is arranged on one axial side (+Y side) of the fixed surface 12b. In this embodiment, three connection members 90 are provided corresponding to each of the U-phase, V-phase, and W-phase coils 42 of the stator 40. The number of connection members 90 is not limited to three, and may be provided, for example, six or nine. The connecting member 90 is made of a metal material with low electrical resistivity, such as a copper alloy.

Housing 10 accommodates rotor 30, stator 40, transmission mechanism 3, and inverter 8 therein. The housing 10 has a motor housing part 10a, a transmission mechanism housing part 10b, and an inverter housing part 10c. The motor accommodating portion 10a accommodates the rotor 30 and the stator 40 therein. The transmission mechanism accommodating portion 10b accommodates the transmission mechanism 3 therein. The inverter accommodating portion 10c accommodates the inverter 8 therein. The transmission mechanism housing part 10b is arranged on the other axial side (-Y side) of the motor housing part 10a, and is connected to the motor housing part 10a in the axial direction. The inverter accommodating part 10c is arranged above the motor accommodating part 10a (+Z side) and is connected to the motor accommodating part 10a in the vertical direction (Z-axis direction). The inverter accommodating portion 10c may be disposed on one axial side or the other axial side of the motor accommodating portion 10a, and may be connected to the motor accommodating portion 10a in the axial direction. The housing 10 includes a first housing member 11 , a second housing member 13 , a third housing member 14 , a fourth housing member 15 , and an inverter housing 82 .

The first housing member 11 surrounds the rotor 30 and the stator 40 from the outside in the radial direction. The second housing member 13 is located on one axial side (+Y side) of the first housing member 11 and is fixed to the first housing member 11 . The third housing member 14 is located on the other axial side (-Y side) of the first housing member 11 and is fixed to the first housing member 11. The fourth housing member 15 is located on the other axial side of the third housing member 14 and is fixed to the third housing member 14 . The inverter housing 82 is located above the first housing member 11 (+Z side) and is fixed to the first housing member 11.

The first housing member 11 has a substantially cylindrical shape centered on the central axis J1. The first housing member 11 constitutes a part of the motor housing section 10a. The first housing member 11 constitutes a lower (−Z side) portion of the inverter accommodating portion 10c. The first housing member 11 has a peripheral wall portion 12, an inlet 58, and an outlet 59.

The peripheral wall portion 12 has a substantially cylindrical shape centered on the central axis J1. The peripheral wall portion 12 opens on one axial side (+Y side) and the other axial side (−Y side). The peripheral wall portion 12 surrounds the rotor 30 and the stator 40 from the outside in the radial direction. The peripheral wall portion 12 includes a first wall portion 12c, a fixing portion 12a, a second wall portion 12f, and a flow path 50. As shown in FIG. 2, the peripheral wall portion 12 has a holding portion 60. The holding portion 60 will be described in detail later.

As shown in FIG. 1, the first wall portion 12c is a portion of the peripheral wall portion 12 on one axial side (+Y side).
The fixed portion 12a is a portion of the peripheral wall portion 12 located approximately at the center in the axial direction. Fixed portion 12a faces stator core 41 in the radial direction. An end on one axial side (+Y side) of the fixed portion 12a is connected to an end on the other axial side (−Y side) of the first wall portion 12c. In this embodiment, the inner diameter of the fixed portion 12a is smaller than the inner diameter of the first wall portion 12c.

The fixed portion 12a has a fixed surface 12b. The fixed surface 12b is the inner peripheral surface of the fixed portion 12a. The fixed surface 12b faces radially inward. The fixed surface 12b extends in the circumferential direction. As shown in FIG. 2, the fixed surface 12b contacts the outer peripheral surface of the stator core 41. The other axial end (-Y side) of the fixed surface 12b coincides with the other axial end of the stator core 41. On the other hand, the end portion of the fixed surface 12b on one axial side (+Y side) is located on the other axial side than the end portion of the stator core 41 on the one axial side. Therefore, the axial dimension of the fixed surface 12b is smaller than the axial dimension of the stator core 41. In this embodiment, the stator core 41 is fixed to the fixed surface 12b by shrink fitting. Thereby, stator core 41 is firmly fixed to housing 10. Note that the stator core 41 and the fixing surface 12b may be fixed by press fitting other than shrink fitting, or may be fixed by adhesive.

As shown in FIG. 1, the second wall portion 12f is a portion of the peripheral wall portion 12 on the other axial side (−Y side). An end on one axial side (+Y side) of the second wall portion 12f is connected to an end on the other axial side of the fixed portion 12a. In this embodiment, the inner diameter of the second wall portion 12f is smaller than the inner diameter of the fixed portion 12a.

As shown in FIG. 2, the second wall portion 12f has a support portion 12g. The support portion 12g is a portion of the second wall portion 12f located radially inward than the fixed surface 12b. The support portion 12g has a support surface 12h. That is, the second wall portion 12f has a support surface 12h. The support surface 12h is a surface of the outer surface of the support portion 12g that faces one side in the axial direction (+Y side). The support surface 12h contacts a surface of the stator core 41 facing in the axial direction on the radially inner side of the outer circumferential surface of the stator core 41. In this embodiment, the support surface 12h contacts the surface of the stator core 41 facing the other axial side (-Y side). Therefore, according to this embodiment, the axial position of the stator 40 with respect to the housing 10 can be determined with high precision.

As shown in FIG. 1, the flow path 50 is a flow path through which the fluid L flows. Fluid L cools stator 40 and inverter 8. In this embodiment, the fluid L is water. The flow path 50 is provided inside the peripheral wall portion 12 . The flow path 50 is located on the radially outer side of the fixed surface 12b. Therefore, the flow path 50 is provided at least inside the fixed portion 12a. The flow path 50 is provided from an end on one axial side (+Y side) of the peripheral wall portion 12 to an end on the other axial side (−Y side). The flow path 50 extends along the circumferential direction inside the peripheral wall portion 12 and is provided all around the circumferential direction. As described above, the stator core 41 is fixed to the fixed surface 12b of the peripheral wall portion 12. The stator 40 is cooled by the fluid L flowing through the flow path 50 via the peripheral wall portion 12 .

The inflow port 58 and the outflow port 59 are holes that radially penetrate a portion of the peripheral wall portion 12 that is radially outer than the flow path 50 . The inlet 58 and the outlet 59 are each connected to the flow path 50. The inflow port 58 is provided on the upper side (+Z side) of the peripheral wall portion 12 . The outflow port 59 is provided at the lower (-Z) portion of the peripheral wall portion 12. The fluid L flows into the channel 50 via the inlet 58 and flows out from the channel 50 via the outlet 59. Note that the positions where the inlet 58 and the outlet 59 are provided are not limited to the present embodiment, and the inlet 58 may be provided on the lower side of the peripheral wall 12 and the outlet 59 may be provided on the upper side of the peripheral wall. good. Furthermore, both the inlet 58 and the outlet 59 may be provided above the peripheral wall 12 , or both the inlet 58 and the outlet 59 may be provided below the peripheral wall 12 .

In this embodiment, the first housing member 11 is made of metal. The first housing member 11 is formed by casting. The first housing member 11 is impregnated with resin. Therefore, according to the present embodiment, defects such as blow holes in the first housing member 11 can be impregnated with the resin, so that the strength of the first housing member 11 can be increased. In the manufacturing process of the drive device 1 of this embodiment, the step of impregnating the first housing member 11 with resin is performed before the stator fixing step Pf1, which will be described later, in which the stator 40 is fixed to the first housing member 11. It is a process. The process of impregnating the first housing member 11 with resin may be a process subsequent to the stator fixing process Pf1.

The second housing member 13 closes an opening on one axial side (+Y side) of the first housing member 11 . The second housing member 13 closes one end of the flow path 50 in the axial direction. The second housing member 13 constitutes a portion on one axial side of the motor housing portion 10a. The second housing member 13 includes a lid portion 13a extending along a plane orthogonal to the central axis J1, and a bearing holding portion 13d provided on the lid portion 13a. The bearing holding portion 13d holds the bearing 71. Note that the second housing member 13 does not need to close one end of the flow path 50 in the axial direction. In this case, one end of the channel 50 in the axial direction is connected to another channel provided separately.

The third housing member 14 closes the opening on the other axial side (-Y side) of the first housing member 11. The third housing member 14 closes the other end of the flow path 50 in the axial direction. The third housing member 14 constitutes a portion on the other axial side of the motor housing portion 10a and a portion on one axial side (+Y side) of the transmission mechanism housing portion 10b. The third housing member 14 includes an opposing wall 14a extending along a plane perpendicular to the central axis J1, a bearing holding portion 14c provided on the opposing wall 14a, and a first hole 14d. The lower (−Z side) portion of the opposing wall portion 14a is located below the first housing member 11. The bearing holding portion 14c holds the bearing 73. The first hole 14d is a hole that passes through the opposing wall 14a in the axial direction. The first hole 14d is located below the first housing member 11. Note that the third housing member 14 does not need to close the other end of the flow path 50 in the axial direction. In this case, the other end of the flow path 50 in the axial direction is connected to another flow path provided separately.

The fourth housing member 15 is arranged on the other axial side (-Y side) of the third housing member 14. The fourth housing member 15 has a cylindrical shape that opens on one side in the axial direction. The fourth housing member 15 is fixed to the third housing member 14. The fourth housing member 15 constitutes a part of the transmission mechanism housing portion 10b. The transmission mechanism 3 is housed inside the fourth housing member 15 . The fourth housing member 15 has a second hole 15a. The second hole portion 15a is a hole that passes through the fourth housing member 15 in the axial direction. When viewed in the axial direction, the second hole 15a overlaps the first hole 14d.

Inverter housing 82 is arranged above first housing member 11 (+D1 side). Inverter housing 82 is fixed to first housing member 11 . The inverter housing 82 is box-shaped and opens downward. Inverter housing 82 constitutes a part of inverter accommodating portion 10c. Inverter housing 82 has an inverter flow path 85, an inverter inlet 88, and an inverter outlet 89.

Inverter flow path 85 is provided in inverter chamber 18c. Fluid L flows through the inverter flow path 85 . Inverter inlet 88 is located at the upstream end of inverter flow path 85 . Inverter outlet 89 is located at the downstream end of inverter flow path 85 . Inverter outlet 89 is connected to inlet 58 . Fluid L flows into inverter flow path 85 from inverter inlet 88 . In the inverter flow path 85, the fluid L flows near the inverter 8 and cools the inverter 8. Fluid L flows into flow path 50 via inverter outlet 89 and inlet 58 .

The transmission mechanism 3 is housed in the transmission mechanism chamber 18b. The transmission mechanism 3 is connected to the shaft 31. The transmission mechanism 3 includes a speed reduction device 4 and a differential device 5. The power output from the rotor 30 is transmitted to the output shaft 6 via the reduction gear device 4 and the differential device 5.

The speed reducer 4 is connected to the shaft 31. The speed reducer 4 reduces the rotational speed of the rotating electric machine 2 and increases the torque output from the rotor 30 according to the speed reduction ratio. The reduction gear 4 transmits the power output from the rotor 30 to the differential gear 5.

Differential device 5 is connected to reduction gear device 4 and output shaft 6 . The differential device 5 transmits the power output from the rotor 30 to the output shaft 6. The output shaft 6 extends in the axial direction along an output axis J2 parallel to the central axis J1. In this embodiment, the output shaft 6 is the axle of the vehicle. The differential device 5 absorbs the speed difference between the left and right wheels when the vehicle turns, and transmits the same torque to the output shaft 6 connected to both the left and right wheels. The differential device 5 has a ring gear 5a. Ring gear 5a is rotatable around output axis J2. Power output from the rotor 30 is transmitted to the ring gear 5a via the reduction gear device 4.

As shown in FIG. 2, the sealing portion 95 contacts the peripheral wall portion 12 and the stator core 41 and seals between the peripheral wall portion 12 and the stator core 41. The sealing portion 95 extends in the circumferential direction and is provided all around the circumferential direction. In this embodiment, two sealing parts 95 are provided. The sealing portions 95 are provided on both sides of the fixed surface 12b in the axial direction. One of the sealing portions 95a is arranged on one axial side (+Y side) of the fixed surface 12b. The other sealing portion 95b is arranged on the other axial side (-Y side) of the fixed surface 12b. In this embodiment, the sealing portion 95 is a liquid gasket. The sealing parts 95a and 95b are each held by the holding part 60. The sealing portions 95a and 95b are liquid in an uncured state, and adhere to the peripheral wall portion 12 and the stator core 41 when cured.

The holding portion 60 is a part of the inner surface of the peripheral wall portion 12. The holding portion 60 extends in the circumferential direction and is provided all around the circumferential direction. The holding portions 60 are provided on both sides of the fixed surface 12b in the axial direction. In this embodiment, the peripheral wall portion 12 includes a first holding portion 61 and a second holding portion 63 as the holding portion 60 . Holding portion 60 has holding surfaces 62 and 64 that face stator core 41 . More specifically, the first holding part 61 has a first holding surface 62. The second holding portion 63 has a second holding surface 64 .

The first holding portion 61 is located on one axial side (+Y side) of the fixed surface 12b. The first holding portion 61 is the inner surface of the first wall portion 12c. The first holding portion 61 has a second surface 61a and a third surface 61b. The second surface 61a is a portion of the inner surface of the first wall portion 12c that faces radially inward, and is a portion that contacts the sealing portion 95a. The third surface 61b is a surface facing one side in the axial direction among the inner surfaces of the fixed portion 12a. The third surface 61b connects the end of the second surface 61a on the other axial side (-Y side) and the fixed surface 12b.
In this embodiment, the first holding surface 62 is a portion of the second surface 61a that faces the stator core 41 in the radial direction. The first holding surface 62 is a radial holding surface that faces the stator core 41 in the radial direction.

The sealing portion 95a is filled between the first holding surface 62, that is, the radial holding surface and the stator core 41. The sealing portion 95a is held on the second surface 61a and the third surface 61b. Thereby, the sealing part 95a is held by the first holding part 61. Sealing portion 95a is arranged between first holding surface 62 and the outer circumferential surface of stator core 41 in the radial direction, and contacts both first holding surface 62 and the outer circumferential surface of stator core 41. Sealing portion 95a seals between peripheral wall portion 12 and stator core 41 on one axial side of fixed surface 12b.

The second holding portion 63 is located on the other axial side (−Y side) of the fixed surface 12b. The second holding portion 63 is a part of the inner surface of the second wall portion 12f and is a portion that comes into contact with the sealing portion 95b. The second holding portion 63 is arranged on the radially inner side of the support surface 12h. The second holding surface 64 is a surface that connects the radially inner end of the support surface 12h and the end on one axial side (+Y side) of the inner circumferential surface of the support portion 12g. In this embodiment, the second holding surface 64 is an inclined surface located in a direction axially away from the stator core 41 as it goes radially inward. The second holding surface 64 axially faces the surface of the stator core 41 facing the other side in the axial direction. The second holding surface 64 is an axial holding surface that faces the stator core 41 in the axial direction. According to this embodiment, the second holding surface 64 facing the stator core 41 in the axial direction can be provided without providing a groove recessed from the surface facing one axial direction of the support portion 12g to the other axial direction. Therefore, it is possible to suppress the strength of the support portion 12g from decreasing in the axial direction. Therefore, the axial position of the stator 40 can be determined with high precision by the support portion 12g.

Further, as described above, since the second holding part 63 is disposed on the radially inner side of the support surface 12h, for example, the second holding part may be placed on a portion of the support part 12g that is radially inner than the support surface 12h. Compared to the case where a groove recessed on the other side in the direction is provided, it is possible to suppress the strength of the support portion 12g from decreasing in the axial direction. Therefore, the axial position of the stator 40 can be determined with high precision by the support portion 12g.

The sealing portion 95b is filled between the second holding surface 64, that is, the axial holding surface and the stator core 41. The sealing portion 95b is held by the second holding surface 64. Thereby, the sealing part 95b is held by the second holding part 63. The sealing portion 95b is arranged in the axial direction between the second holding surface 64 and the surface of the stator core 41 facing the other axial direction (-Y side). Contact both sides facing the other side. Sealing portion 95b seals between peripheral wall portion 12 and stator core 41 on the other axial side of fixed surface 12b. As described above, the sealing portion 95a seals between the peripheral wall portion 12 and the stator core 41 on one axial side (+Y side) of the fixed surface 12b. Therefore, according to the present embodiment, the sealing portions 95a and 95b can seal between the peripheral wall portion 12 and the stator core 41 on both sides of the fixed surface 12b in the axial direction. Furthermore, the stator core 41 can be firmly fixed to the housing 10. Furthermore, even if the fluid L or the like intrudes into the inside of the housing 10, the space between the stator core 41 and the peripheral wall 12 is sealed by the sealing parts 95a and 95b. 12, the fluid L etc. are sealed. Therefore, it is possible to suppress the fluid L and the like from adhering to the stator 40, the connecting member 90, the inverter 8, and the like. Therefore, it is possible to suppress the drive performance of the rotating electrical machine 2 and the drive device 1 from deteriorating, and it is possible to improve the durability and reliability of the rotating electrical machine 2 and the drive device 1.

As described above, the stator core 41 is fixed to the fixed surface 12b by shrink fitting. According to this embodiment, as described above, the sealing parts 95a and 95b can seal between the peripheral wall part 12 and the stator core 41 on both sides of the fixed surface 12b in the axial direction, so that the stator core 41 can be attached to the housing 10. Can be firmly fixed. Furthermore, even if the fluid L or the like intrudes into the inside of the housing 10, the space between the stator core 41 and the peripheral wall 12 is sealed by the sealing parts 95a and 95b. 12, the fluid L etc. are sealed. Therefore, it is possible to suppress the drive performance of the rotating electrical machine 2 and the drive device 1 from deteriorating.

The support surface 12h is arranged on the other axial side (-Y side) of the fixed surface 12b. As described above, the support surface 12h comes into contact with the surface of the stator core 41 facing the other side in the axial direction, and determines the axial position of the stator core 41 with respect to the housing 10. The axial dimension of the stator core 41 has a tolerance, and the axial dimension between the support surface 12h and the first holding part 61 has a tolerance. Therefore, in the axial direction, the relative position between the first holding part 61 and the end of the stator core 41 on one axial side (+Y side) is the same as the relative position of the second holding part 63 and the end of the stator core 41 on the other side in the axial direction. It is more likely to vary than relative position. According to this embodiment, the dimension L11 of the first holding part 61 is larger than the dimension L12 of the second holding part 63 in the axial direction. Therefore, since the axial dimension of the first holding part 61 can be increased, the sealing part 95a held by the first holding part 61 can be stably brought into contact with the stator core 41. Therefore, stator core 41 can be firmly fixed to housing 10 on one axial side of fixing surface 12b. Further, since the space between the stator core 41 and the peripheral wall 12 is sealed by the sealing parts 95a and 95b, the fluid L and the like are sealed between the stator core 41 and the peripheral wall 12.
According to this embodiment, the volume of the sealing part 95a held by the first holding part 61 is larger than the volume of the sealing part 95b held by the second holding part 63, so the sealing part 95a is sealed. Stopping performance can be improved. Therefore, stator core 41 can be firmly fixed to housing 10 on one axial side (+Y side) of fixing surface 12b. Further, since the space between the stator core 41 and the peripheral wall 12 is sealed by the sealing parts 95a and 95b, the fluid L and the like are sealed between the stator core 41 and the peripheral wall 12. Therefore, it is possible to more suitably suppress the fluid L from adhering to the connection member 90 which is disposed on one axial side of the stator core 41. Therefore, short-circuiting of the connecting member 90 can be more suitably suppressed, and deterioration of the driving performance of the rotating electric machine 2 and the drive device 1 can be more suitably suppressed.

Next, in this embodiment, a stator fixing step Pf1 for fixing the stator 40 to the first housing member 11 will be described. The stator fixing process Pf1 is part of the manufacturing process of the rotating electric machine 2 and the drive device 1. The stator fixing step Pf1 includes a first step Pf11 of applying an uncured sealing portion 95 to the stator core 41, a second step Pf12 of inserting the stator 40 into the first housing member 11, and a second step Pf12 of inserting the stator 40 into the first housing member 11. and a fourth step Pf14 of curing the sealing portion 95. As described above, stator core 41 is fixed to fixed surface 12b by shrink fitting. Note that in this specification, "workers, etc." includes workers who perform each work, assembly equipment, and the like. Each work may be performed only by a worker, only by an assembly device, or by a worker and an assembly device.

In the first step Pf11, an operator or the like applies in advance an uncured sealing portion 95 to the outer surface of the stator core 41 to which the coil 42 is attached via an insulator (not shown). As shown in FIG. 3A, an operator or the like applies an uncured sealing portion 95a to the edge of the outer peripheral surface of the stator core 41 on one axial side (+Y side) all around the circumferential direction. An operator or the like applies uncured sealing portion 95b to the outer edge of the surface of stator core 41 facing the other axial side (-Y side) all around the circumference.

In the second step Pf12, an operator or the like first heats the first housing member 11. Since the first housing member 11 thermally expands, the inner diameter of the peripheral wall portion 12 increases. At this time, the inner diameter of the fixed portion 12a is slightly larger than the outer diameter of the stator core 41, and the inner diameter of the second wall portion 12f is smaller than the outer diameter of the stator core 41. Next, the operator or the like moves the stator 40 from one axial side (+Y side) of the first housing member 11 to the other axial side (-Y side), and moves the stator 40 to the first housing member 11. Insert inside. As described above, since the inner diameter of the fixed portion 12a is slightly larger than the outer diameter of the stator core 41, the stator 40 can be easily inserted into the first housing member 11. As shown in FIG. 3B, when the stator 40 is inserted until the surface facing the other axial direction of the stator core 41 comes into contact with the support surface 12h, the second step Pf12 ends. At this time, the uncured sealing portion 95a is filled between the first holding surface 62 and the stator core 41, and the uncured sealing portion 95b is filled between the second holding surface 64 and the stator core 41. Ru. According to the present embodiment, the first holding part 61 has a second surface 61a that radially faces the stator core 41 and faces inward in the radial direction, and a second surface 61a that connects the second surface 61a and the fixed surface 12b and faces one side in the axial direction. Since the third surface 61b has the third surface 61b, the unhardened sealing part 95a can be dammed in the axial direction, and the unhardened sealing part 95a can be held between the first holding surface 62 and the stator core 41. 95a can be suitably filled. Therefore, the uncured sealing portion 95a can be filled between the first holding surface 62 and the stator core 41 only by moving the stator 40 to the other side in the axial direction, and the number of work steps in the stator fixing step Pf1 increases. can be suppressed.

In the third step Pf13, the operator or the like cools the first housing member 11. As a result, the first housing member 11 undergoes thermal contraction, and the inner diameter of the peripheral wall portion 12 becomes smaller. At this time, the inner diameter of the fixed portion 12a becomes smaller than the outer diameter of the stator core 41, and the stator core 41 is fixed to the fixed surface 12b.

In the fourth step Pf14, an operator or the like hardens the sealing parts 95a and 95b. When the hardened sealing part 95a is held by the first holding part 61 and the hardened sealing part 95b is held by the second holding part 63, the stator fixing step Pf1 ends. Note that the fourth process Pf14 is a process in which the content of the work is selected depending on the type of the sealing part 95. For example, if the sealing part 95 is made of an ultraviolet curable material, the fourth process Pf14 is a process in which the content of the work is selected depending on the type of the sealing part 95. irradiated.

In addition, in this embodiment, the step of fixing the stator 40 to the first housing member 11 may be a stator fixing step Pf2 described below. The stator fixing step Pf2 includes a first step Pf21 of applying the sealing portion 95 to the stator core 41, a second step Pf22 of inserting the stator 40 into the first housing member 11, and fixing the stator 40 to the first housing member 11. The step Pf23 includes a third step Pf23, a fourth step Pf24 in which the sealing portion 95a is filled between the first holding surface 62 and the stator core 41, and a fifth step Pf25 in which the sealing portion 95 is hardened.

In the first step Pf21, as shown in FIG. 3C, an operator or the like applies an uncured sealing portion 95a to the outer edge of the surface of the stator core 41 facing one side in the axial direction (+Y side) over one circumference in the circumferential direction. Apply. Other operations in the first step Pf21 are similar to those in the first step Pf11 described above.

In the second step Pf22, as shown in FIG. 3D, by the same operation as the second step Pf12 described above, the stator 40 is moved into the first Insert into the housing member 11.

In the third step Pf23, the operator cools the first housing member 11 and fixes the stator core 41 to the fixing surface 12b by performing the same operations as in the third step Pf13 described above.

In the fourth step Pf24, an operator or the like fills the space between the first holding surface 62 and the stator core 41 with the uncured sealing portion 95a using the leveling member 96.

In the fifth step Pf25, the sealing portions 95a and 95b are hardened by the same operation as the fourth step Pf14 described above. When the hardened sealing part 95a is held by the first holding part 61 and the hardened sealing part 95b is held by the second holding part 63, the stator fixing step Pf2 ends.

Note that if it is possible to seal between the peripheral wall portion 12 and the stator core 41 on both sides of the fixed surface 12b in the axial direction, the holding portions 60 do not need to be provided on both sides of the fixed surface 12b in the axial direction. It may be provided only on one side in the axial direction (+Y side) or the other side in the axial direction (−Y side). For example, when the second holding part 63 is not provided, a sealing part provided on the other axial side of the fixing surface 12b can be arranged at a corner where the fixing surface 12b and the support surface 12h are connected. Thereby, the space between the peripheral wall portion 12 and the stator core 41 can be sealed on the other axial side of the fixed surface 12b.

<Second embodiment>
FIG. 4 is a cross-sectional view showing a part of the drive device 201 of the second embodiment. In the following description, the same reference numerals are given to the same components as in the first embodiment described above, and the description thereof will be omitted.

The rotating electric machine 202 of this embodiment has a sealing part 295. The sealing portion 295 has a sealing portion 295a disposed on one axial side (+Y side) of the fixing surface 212b, which is the inner peripheral surface of the fixing portion 212a, and a sealing portion 295a disposed on the other axial side (−Y side) of the fixing surface 212b. a sealing portion 295b disposed on the side).
The peripheral wall portion 212 of the first housing member 211 of this embodiment has a holding portion 260. The peripheral wall portion 212 includes a first holding portion 261 and a second holding portion 263 as the holding portion 260 . The first holding part 261 has a first holding surface 262. The second holding part 263 has a second holding surface 264.

The first holding portion 261 is located on one axial side (+Y side) of the fixed surface 212b. The first holding portion 261 is a part of the inner surface of the first wall portion 212c. The first holding portion 261 is a groove portion recessed radially outward from the inner circumferential surface of the peripheral wall portion 212 . The first holding portion 261 extends in the circumferential direction and is provided all around the circumferential direction. The first holding portion 261 has a first surface 261a facing inward in the radial direction.
The first holding surface 262 is a portion of the first surface 261a that faces the stator core 41 in the radial direction. The first holding surface 262 is a radial holding surface that faces the stator core 41 in the radial direction.

The sealing portion 295a is filled between the first holding surface 262, that is, the radial holding surface and the stator core 41. Sealing portion 295a contacts both first holding surface 262 and the outer peripheral surface of stator core 41. Sealing portion 295a seals between peripheral wall portion 212 and stator core 41 on one axial side (+Y side) of fixed surface 212b. The sealing part 295a is held by the first holding part 261. The sealing portion 295a is housed inside the first holding portion 261, that is, a groove portion recessed in the radial direction. Therefore, according to the present embodiment, it is possible to suitably suppress leakage of the sealing part 295a from the first holding part 261 in the axial direction, so that the sealing part 295a can be more stably brought into contact with the stator core 41. . Therefore, the space between the peripheral wall portion 212 and the stator core 41 can be more preferably sealed on one axial side of the fixed surface 212b.

The second holding portion 263 is located on the other axial side (−Y side) of the fixing surface 212b. The second holding portion 263 is a part of the inner surface of the second wall portion 212f. The second holding portion 263 is a groove recessed from the surface facing one axial side (+Y side) of the support portion 212g toward the other axial side. The second holding portion 263 extends in the circumferential direction and is provided all around the circumferential direction. The second holding portion 263 is arranged on the radially outer side of the support surface 212h.
The second holding surface 264 is a surface of the inner surface of the second holding portion 263 that faces one side in the axial direction. The second holding surface 264 axially faces the surface of the stator core 41 facing the other side in the axial direction. The second holding surface 264 is an axial holding surface that faces the stator core 41 in the axial direction.

The sealing portion 295b is filled between the second holding surface 264, that is, the axial holding surface and the stator core 41. Sealing portion 295b contacts both second holding surface 264 and the surface of stator core 41 facing the other axial side (-Y side). Sealing portion 295b seals between peripheral wall portion 212 and stator core 41 on the other axial side of fixed surface 212b. The sealing part 295b is held by the second holding part 263. The sealing portion 295b is housed inside the second holding portion 263, that is, a groove recessed in the radial direction. Therefore, according to the present embodiment, it is possible to suitably suppress leakage of the sealing part 295b from the second holding part 263 to the outside in the radial direction, so that the sealing part 295b can be more stably brought into contact with the stator core 41. can. Therefore, the space between the peripheral wall portion 212 and the stator core 41 can be more preferably sealed on the other axial side of the fixed surface 212b.
Furthermore, as described above, the sealing portion 295a seals between the peripheral wall portion 212 and the stator core 41 on one axial side (+Y side) of the fixed surface 212b. Therefore, according to the present embodiment, the sealing parts 295a and 295b can seal between the peripheral wall part 212 and the stator core 41 on both sides of the fixed surface 212b in the axial direction, so that the stator core 41 can be firmly fixed to the housing 210. can do. Since the space between stator core 41 and peripheral wall portion 212 is sealed by sealing portions 295a and 295b, fluid L and the like are sealed between stator core 41 and peripheral wall portion 212. Therefore, the durability and reliability of the rotating electric machine 202 and the drive device 201 can be improved.

Further, according to the present embodiment, the dimension L21 of the first holding part 261 is larger than the dimension L22 of the second holding part 263 in the axial direction. Therefore, the sealing part 295a held by the first holding part 261 can be stably brought into contact with the stator core 41, so that the space between the peripheral wall part 212 and the stator core 41 is further reduced on one axial side of the fixed surface 212b. Can be sealed appropriately.

<Third embodiment>
FIG. 5 is a cross-sectional view showing a part of the drive device 301 of the third embodiment. In the following description, the same reference numerals are given to the same components as in the second embodiment described above, and the description thereof will be omitted.

The rotating electric machine 302 of this embodiment has a sealing part 395. The sealing portion 395 includes a sealing portion 295a disposed on one axial side (+Y side) of the fixing surface 312b, which is the inner circumferential surface of the fixing portion 312a, and a sealing portion 295a disposed on the other axial side (−Y side) of the fixing surface 312b. a sealing portion 395b disposed on the side).
The peripheral wall portion 312 of the first housing member 311 of this embodiment has a holding portion 360. The peripheral wall portion 312 includes a first holding portion 261 and a second holding portion 363 as the holding portion 360 . The first holding part 261, first holding surface 262, and sealing part 295a of this embodiment have the same configuration as the first holding part 261, first holding surface 262, and sealing part 295a of the above-mentioned second embodiment. Therefore, the explanation will be omitted. The second holding part 363 has a second holding surface 364.

The second holding portion 363 is located on the other axial side (−Y side) of the fixed surface 312b. The second holding portion 363 is a part of the inner surface of the second wall portion 312f. The second holding portion 363 is arranged on the radially outer side of the support surface 312h. The second holding portion 363 is a groove recessed from a portion where the fixed surface 312b and the support surface 312h are connected in a direction between the other axial side and the radial outside. The second holding portion 363 extends in the circumferential direction and is provided all around the circumferential direction. The second holding portion 363 has an arc shape when viewed in the circumferential direction. Therefore, according to the present embodiment, the second holding part 363 can be easily cut by cutting using a cutting tool such as a drill, compared to a case where the second holding part 363 has a rectangular shape when viewed in the circumferential direction. The number of man-hours for manufacturing the rotating electric machine 302 and the drive device 301 can be suppressed from increasing. Furthermore, compared to the case where the second holding part 363 has a rectangular shape when viewed in the circumferential direction, the force applied from the stator core 41 to the supporting part 312g in the other axial direction is applied to a part of the second holding part 363. It is possible to suppress the concentrated application, and it is possible to suppress the support portion 312g from being bent in the axial direction. Therefore, the axial position of the stator 40 can be determined with high precision by the support portion 312g.

The second holding surface 364 is a portion of the inner surface of the second holding portion 363 that faces one side in the axial direction. The second holding surface 364 axially faces the surface of the stator core 41 facing the other side in the axial direction. The second holding surface 364 is an axial holding surface that faces the stator core 41 in the axial direction.

The sealing portion 395b is filled between the second holding surface 364, that is, the axial holding surface and the stator core 41. Sealing portion 395b contacts both second holding surface 364 and the surface of stator core 41 facing the other axial side (-Y side). Sealing portion 395b seals between peripheral wall portion 312 and stator core 41 on the other axial side of fixed surface 312b. The sealing part 395b is held by the second holding part 363. The sealing part 395b is housed inside the second holding part 363, that is, the groove. Therefore, according to the present embodiment, it is possible to suitably suppress leakage of the sealing part 395b from the second holding part 363 to the outside in the radial direction, so that the sealing part 395b can be more stably brought into contact with the stator core 41. can. Therefore, the space between the peripheral wall portion 312 and the stator core 41 can be more preferably sealed on the other axial side of the fixed surface 312b.
Further, the sealing portion 295a seals between the peripheral wall portion 312 and the stator core 41 on one axial side (+Y side) of the fixed surface 312b. Therefore, according to the present embodiment, the sealing parts 295b and 395b can seal between the peripheral wall part 312 and the stator core 41 on both sides of the fixed surface 312b in the axial direction, so that the stator core 41 can be firmly fixed to the housing 310. can do. Since the space between stator core 41 and peripheral wall 312 is sealed by sealing parts 295b and 395b, fluid L and the like are sealed between stator core 41 and peripheral wall 312. Therefore, the durability and reliability of the rotating electric machine 302 and the drive device 301 can be improved.

Further, according to the present embodiment, the dimension L21 of the first holding part 261 is larger than the dimension L32 of the second holding part 363 in the axial direction. Therefore, the sealing part 295a held by the first holding part 261 can be stably brought into contact with the stator core 41, so that the space between the peripheral wall part 312 and the stator core 41 is further reduced on one axial side of the fixed surface 312b. Can be sealed appropriately.

<Fourth embodiment>
FIG. 6 is a cross-sectional view showing a part of the drive device 401 of the fourth embodiment. In the following description, the same reference numerals are given to the same components as in the first embodiment described above, and the description thereof will be omitted.

The rotating electrical machine 402 of this embodiment has a sealing part 495. The sealing portion 495 includes a sealing portion 95a that is disposed on one axial side (+Y side) of the fixing surface 412b, which is the inner peripheral surface of the fixing portion 412a, and a sealing portion 95a that is disposed on the other axial side (-Y side) of the fixing surface 412b. a sealing portion 495b disposed on the side).
The peripheral wall portion 412 of the first housing member 411 of this embodiment has a holding portion 460. The peripheral wall portion 412 includes a first holding portion 61 and a second holding portion 463 as the holding portion 460 . The first holding part 61, first holding surface 62, and sealing part 95a of this embodiment have the same configuration as the first holding part 61, first holding surface 62, and sealing part 95a of the above-described first embodiment. Therefore, the explanation may be omitted. The second holding part 463 has a second holding surface 464.

The second holding portion 463 is located on the other axial side (−Y side) of the fixing surface 412b. The second holding portion 463 is the inner surface of the second wall portion 412f. The second holding portion 463 has a second surface 463a and a third surface 463b. The second surface 463a is a surface of the inner surface of the second wall portion 412f that faces outward in the radial direction. The third surface 463b is a surface of the inner surface of the second wall portion 412f that faces the other side in the axial direction. The third surface 463b connects the end of the second surface 463a on one axial side (+Y side) and the fixed surface 412b.
The second holding surface 464 is a portion of the second surface 463a that faces the stator core 41 in the radial direction. The second holding surface 464 is a radial holding surface that faces the stator core 41 in the radial direction.

The sealing portion 495b is filled between the second holding surface 464, that is, the radial holding surface and the stator core 41. Sealing portion 495b contacts both second holding surface 464 and the outer peripheral surface of stator core 41. The sealing part 495b is held by the second holding part 463. Sealing portion 495b seals between peripheral wall portion 412 and stator core 41 on the other axial side (−Y side) of fixed surface 412b. Furthermore, the sealing portion 95a seals between the peripheral wall portion 412 and the stator core 41 on one axial side (+Y side) of the fixed surface 412b. Therefore, according to the present embodiment, the sealing parts 95a and 495b can seal between the peripheral wall part 412 and the stator core 41 on both sides of the fixed surface 412b in the axial direction, so that the stator core 41 can be firmly fixed to the housing 410. can do. Since the space between stator core 41 and peripheral wall portion 412 is sealed by sealing portions 95a and 495b, fluid L and the like are sealed between stator core 41 and peripheral wall portion 412. Therefore, the durability and reliability of the rotating electric machine 402 and the drive device 401 can be improved.

The peripheral wall portion 412 of this embodiment does not have a support surface that contacts the axially facing surface of the stator core 41 in the axial direction. Therefore, the first housing member 411 and the stator core 41 are positioned relative to each other in the axial direction by a jig used when assembling the stator core 41 to the peripheral wall portion 412. This embodiment and the configurations of the fifth and sixth embodiments, which do not have a support surface like this embodiment, are suitable when the flatness and axial dimension of the axially facing surface of the stator core 41 are unstable. will be adopted.

<Fifth embodiment>
FIG. 7 is a cross-sectional view showing a part of the drive device 501 of the fifth embodiment. In the following description, the same reference numerals are given to the same components as in the second embodiment described above, and the description thereof will be omitted. In addition, in the following description, the same reference numerals are given to the same components as in the fourth embodiment described above, and the description thereof will be omitted.

The rotating electric machine 502 of this embodiment has a sealing part 595. The sealing part 595 has a sealing part 295a arranged on one axial side (+Y side) of the fixing surface 512b, which is the inner circumferential surface of the fixing part 512a, and a sealing part 295a disposed on the other axial side (-Y side) of the fixing surface 512b. a sealing portion 495b disposed on the side).
The peripheral wall portion 512 of the first housing member 511 of this embodiment has a holding portion 560. The peripheral wall portion 512 includes a first holding portion 261 and a second holding portion 463 as the holding portion 560 . The first holding part 261, first holding surface 262, and sealing part 295a of this embodiment have the same configuration as the first holding part 261, first holding surface 262, and sealing part 295a of the above-mentioned second embodiment. be. That is, the first holding portion 261 is a groove portion that is recessed radially outward from the inner circumferential surface of the peripheral wall portion 512 and has a first surface 261a facing radially inward. The first holding surface 262 is a portion of the first surface 261a that faces the stator core 41 in the radial direction. The first holding surface 262 is a radial holding surface that faces the stator core 41 in the radial direction. Sealing portion 295a seals between peripheral wall portion 512 and stator core 41 on one axial side (+Y side) of fixed surface 512b.

The second holding part 463, second holding surface 464, and sealing part 495b of this embodiment have the same configuration as the second holding part 463, second holding surface 464, and sealing part 495b of the fourth embodiment described above. be. That is, the second holding portion 463 has a second surface 463a facing inward in the radial direction, and a third surface 463b connecting the second surface 463a and the fixed surface 512b and facing the other side in the axial direction (-Y side). However, the second holding surface 464 is a portion of the second surface 463a that faces the stator core 41 in the radial direction. The second holding surface 464 is a radial holding surface that faces the stator core 41 in the radial direction. Sealing portion 495b seals between peripheral wall portion 512 and stator core 41 on the other axial side of fixed surface 512b. Furthermore, as described above, the sealing portion 295a seals between the peripheral wall portion 512 and the stator core 41 on one axial side (+Y side) of the fixed surface 512b. Therefore, according to the present embodiment, the sealing parts 295a and 495b can seal between the peripheral wall part 512 and the stator core 41 on both sides of the fixed surface 512b in the axial direction, so that the stator core 41 can be firmly fixed to the housing 510. can do. Since the space between stator core 41 and peripheral wall portion 512 is sealed by sealing portions 295a and 495b, fluid L and the like are sealed between stator core 41 and peripheral wall portion 512. Therefore, the durability and reliability of the rotating electric machine 502 and the drive device 501 can be improved.

In this embodiment, the first holding portion has a second surface facing inward in the radial direction, and a third surface connecting the second surface and the fixing surface 512b and facing one side in the axial direction (+Y side). However, the first holding surface may be a portion of the second surface that faces the stator core 41 in the radial direction. Further, the second holding portion is a groove portion that is recessed radially outward from the inner circumferential surface of the peripheral wall portion 512 and has a first surface facing radially inward, and the second holding surface is a portion of the first surface that is attached to the stator core 41. It may also be a portion radially opposed to.

<Sixth embodiment>
FIG. 8 is a cross-sectional view showing a part of the drive device 601 of the sixth embodiment. In the following description, the same reference numerals are given to the same components as in the second embodiment described above, and the description thereof will be omitted.

The rotating electric machine 602 of this embodiment has a sealing part 695. The sealing part 695 has a sealing part 295a disposed on one axial side (+Y side) of the fixing surface 612b, which is the inner circumferential surface of the fixing part 612a, and a sealing part 295a disposed on the other axial side (-Y side) of the fixing surface 612b. a sealing portion 695b disposed on the side).
The peripheral wall portion 612 of the first housing member 611 of this embodiment has a holding portion 660. The peripheral wall portion 612 includes a first holding portion 261 and a second holding portion 663 as the holding portion 660 . The first holding part 261, first holding surface 262, and sealing part 295a of this embodiment have the same configuration as the first holding part 261, first holding surface 262, and sealing part 295a of the above-mentioned second embodiment. Therefore, the explanation may be omitted. The second holding part 663 has a second holding surface 664.

The second holding portion 663 is located on the other axial side (−Y side) of the fixing surface 212b. The second holding portion 663 is a part of the inner surface of the second wall portion 612f. The second holding portion 663 is a groove portion recessed radially outward from the inner circumferential surface of the peripheral wall portion 612 . The second holding portion 663 extends in the circumferential direction and is provided all around the circumferential direction. The second holding portion 663 has a first surface 663a facing radially inward.
The second holding surface 664 is a portion of the first surface 663a that faces the stator core 41 in the radial direction. The second holding surface 664 is a radial holding surface that faces the stator core 41 in the radial direction.

The sealing portion 695b is filled between the second holding surface 664, that is, the radial holding surface and the stator core 41. Sealing portion 695b contacts both second holding surface 664 and the outer peripheral surface of stator core 41. The sealing portion 695b is held by the second holding portion 663. Sealing portion 695b seals between peripheral wall portion 612 and stator core 41 on the other axial side (−Y side) of fixed surface 612b. Furthermore, the sealing portion 295a seals between the peripheral wall portion 612 and the stator core 41 on one axial side (+Y side) of the fixed surface 612b. Therefore, according to the present embodiment, the sealing parts 295a and 695b can seal between the peripheral wall part 612 and the stator core 41 on both sides of the fixed surface 612b in the axial direction, so that the stator core 41 can be firmly fixed to the housing 610. can do. Since the space between stator core 41 and peripheral wall 612 is sealed by sealing parts 295a and 695b, fluid L and the like are sealed between stator core 41 and peripheral wall 612. Therefore, the durability and reliability of the rotating electric machine 602 and the drive device 601 can be improved.

<Seventh embodiment>
FIG. 9 is a cross-sectional view showing a part of the drive device 701 of the seventh embodiment. In this embodiment, the first holding part and the sealing part provided on one axial side (+Y side) of the fixing surface 712b are not shown; however, as the first holding part and the sealing part, the first Either the first holding part 61 and sealing part 95a of the embodiment or the first holding part 261 and sealing part 295a of the second embodiment can be provided. Thereby, the sealing part held by the first holding part seals between the peripheral wall part 712 and the stator core 41 on one axial side (+Y side) of the fixed surface 712b.

The rotating electric machine 702 of this embodiment has a sealing part 795. The sealing portion 795 includes a sealing portion held by the first holding portion described above, and a sealing portion disposed on the other axial side (−Y side) of the fixing surface 712b, which is the inner peripheral surface of the fixing portion 712a. 795b.
The peripheral wall portion 712 of the first housing member 711 of this embodiment has a holding portion 760. The peripheral wall portion 712 includes the above-described first holding portion and a second holding portion 763 as the holding portion 760 .

The support portion 712g of the second wall portion 712f has a support surface 712h, a fourth surface 712i, and a fifth surface 712j. The support surface 712h is a surface facing one side in the axial direction (+Y side). The radially outer end of the support surface 712h is connected to the end of the fixed surface 712b on the other axial side (−Y side). The support surface 712h contacts the surface of the stator core 41 facing the other axial side. The fourth surface 712i is a surface facing inward in the radial direction. One axial end of the fourth surface 712i is connected to the radially inner end of the support surface 712h. The fifth surface 712j is a surface facing one side in the axial direction. The radially outer end of the fifth surface 712j is connected to the other axial end of the fourth surface 712i. A radially inner end of the fifth surface 712j is connected to the inner circumferential surface of the second wall 712f.

The second holding portion 763 is located on the other axial side (−Y side) of the fixed surface 712b. The second holding portion 763 is a part of the inner surface of the second wall portion 712f. The second holding portion 763 includes a fourth surface 712i and a fifth surface 712j. The second holding portion 763 extends in the circumferential direction and is provided all around the circumferential direction. The second holding portion 763 is arranged on the radially inner side of the support surface 712h.
In this embodiment, the second holding surface 764 is the fifth surface 712j. The second holding surface 764 axially faces the surface of the stator core 41 facing the other side in the axial direction. The second holding surface 764 is an axial holding surface that faces the stator core 41 in the axial direction. The second holding surface 764 is arranged on the other axial side (-Y side) of the stator core 41. The second holding surface 764, that is, the axial holding surface is arranged at a position further away from the stator core 41 in the axial direction than the supporting surface 712h.

The sealing portion 795b is filled between the second holding surface 764, that is, the axial holding surface and the stator core 41. The sealing portion 795b is held by the fourth surface 712i and the second holding surface 764. That is, the sealing part 795b is held by the second holding part 763. Sealing portion 795b contacts both second holding surface 764 and the surface of stator core 41 facing the other axial side (-Y side). Sealing portion 795b seals between peripheral wall portion 712 and stator core 41 on the other axial side of fixed surface 712b. As described above, the sealing portion held by the first holding portion (not shown) seals between the peripheral wall portion 712 and the stator core 41 on one axial side (+Y side) of the fixed surface 712b. Therefore, according to the present embodiment, the sealing portion held by the first holding portion (not shown) and the sealing portion 795b seal between the peripheral wall portion 712 and the stator core 41 on both sides of the fixed surface 712b in the axial direction. Therefore, the stator core 41 can be firmly fixed to the housing 710. Since the space between the stator core and the peripheral wall portion 795b is sealed, the fluid L and the like are sealed between the stator core 41 and the peripheral wall portion 712. Therefore, the durability and reliability of the rotating electric machine 702 and the drive device 701 can be improved.

<Eighth embodiment>
FIG. 10 is a cross-sectional view showing a part of the drive device 801 of the eighth embodiment. In this embodiment, the first holding part and the sealing part provided on one axial side (+Y side) of the fixing surface 812b, which is the inner circumferential surface of the fixing part 812a, are not shown in the drawings, but the first holding part The sealing portion includes the first holding portion 61 and the sealing portion 95a of the first embodiment, or the first holding portion 261 and the sealing portion 295a of the second embodiment. A sealing portion can be provided. Thereby, the sealing portion held by the first holding portion seals between the peripheral wall portion 812 and the stator core 41 on one axial side (+Y side) of the fixed surface 812b.

The rotating electric machine 802 of this embodiment has a sealing part 895. The sealing part 895 includes a sealing part held by the first holding part described above, and two sealing parts 895b and 895c arranged on the other side (-Y side) of the fixing surface 812b in the axial direction. have
The peripheral wall portion 812 of the first housing member 811 of this embodiment has a holding portion 860. The peripheral wall portion 812 includes, as the holding portion 860, the above-described first holding portion, a second holding portion 863a, and a third holding portion 863b.

The second holding portion 863a is provided on the other side (−Y side) of the fixing surface 812b in the axial direction. The second holding portion 863a is a part of the inner surface of the second wall portion 812f. The second holding portion 863a has a second holding surface 864a. The second holding part 863a, second holding surface 864a, and sealing part 895b of this embodiment have the same configuration as the second holding part 63, second holding surface 64, and sealing part 95b of the first embodiment described above. be. That is, the second holding portion 863a is arranged radially inside the support surface 812h. The second holding surface 864a is an inclined surface located axially away from the stator core 41 as it goes radially inward. The second holding surface 864a is an axial holding surface that faces the stator core 41 in the axial direction. The sealing portion 895b is filled between the second holding surface 864a, that is, the axial holding surface and the stator core 41. The sealing part 895b is held by the second holding part 863a. Sealing portion 895b contacts both second holding surface 864a and the surface of stator core 41 facing the other axial direction. Sealing portion 895b seals between peripheral wall portion 812 and stator core 41 on the other axial side of fixing surface 812b.

The third holding portion 863b is provided on the other side (-Y side) of the fixing surface 812b in the axial direction. The third holding portion 863b is a part of the inner surface of the second wall portion 812f. The third holding portion 863b has a third holding surface 864b. The third holding part 863b, third holding surface 864b, and sealing part 895c of this embodiment have the same configuration as the second holding part 263, second holding surface 264, and sealing part 295b of the second embodiment described above. be. That is, the third holding portion 863b is arranged on the radially outer side of the support surface 812h. The third holding portion 863b is a groove recessed from the surface of the support portion 812g facing one axial side (+Y side) to the other axial side. The third holding surface 864b is an axial holding surface that faces the stator core 41 in the axial direction. The sealing portion 895c is filled between the third holding surface 864b, that is, the axial holding surface and the stator core 41. The sealing portion 895c contacts both the third holding surface 864b and the surface of the stator core 41 facing the other side in the axial direction. The sealing part 895c is held by the third holding part 863b. Sealing portion 895b seals between peripheral wall portion 812 and stator core 41 on the other axial side of fixing surface 812b.
As described above, sealing portion 895b seals between peripheral wall portion 812 and stator core 41 on the other axial side of fixing surface 812b. Therefore, according to the present embodiment, the peripheral wall portion 812 has a plurality of holding portions 863a, 863b on at least one axial side of the fixing surface 812b, and in the present embodiment, on the other axial side of the fixing surface 812b. However, the sealing portions 895b and 895c held by the holding portions 863a and 863b, respectively, can seal between the peripheral wall portion 812 and the stator core 41. Therefore, the sealing performance between the peripheral wall portion 812 and the stator core 41 can be improved on the other axial side of the fixed surface 812b.

In this embodiment, the peripheral wall part 812 has two holding parts 863a and 863b on the other side in the axial direction than the fixing surface 812b, but the peripheral wall part 812 has three holding parts 863a and 863b on the other side in the axial direction than the fixing surface 812b. It may have more than one holding part. Further, the peripheral wall portion 812 may have a plurality of holding portions only on one side of the fixed surface 812b in the axial direction, or may have a plurality of holding portions on each of both sides of the fixed surface 812b in the axial direction. good.

The present invention is not limited to the above-described embodiments, and other configurations and other methods may be adopted within the scope of the technical idea of the present invention. For example, if it has a holding surface facing the stator, a sealing part is filled between the stator and the holding surface, and the sealing part can seal between the peripheral wall part and the stator core, the shape of the holding part and The configuration is not limited to this embodiment, and various configurations can be adopted.

The first holding part and the second holding part can be combined in the following combinations within a manufacturing possible range. For example, the first holding part 61 of the first embodiment and one of the second holding part 263 of the second embodiment or the second holding part 363 of the third embodiment may be combined. Furthermore, the first holding section 261 of the second embodiment and the second holding section 63 of the first embodiment may be combined.

As long as the stator can be cooled, the configuration of the flow path is not limited to this embodiment, and other configurations can be adopted. For example, the flow path may be configured by a plurality of first flow paths extending in the axial direction and a plurality of second flow paths that connect circumferentially adjacent first flow paths to each other in the circumferential direction.

The embodiments of the present invention and their modifications have been described above, but each configuration and combination thereof in the embodiments are merely examples, and additions, omissions, and substitutions of configurations may be made within the scope of the spirit of the present invention. and other changes are possible. Moreover, the present invention is not limited by the embodiments.

Note that the present technology can have the following configuration.
(1) A rotor rotatable about a central axis, a stator disposed radially outside the rotor, and a housing housing the rotor and the stator therein. The stator has a stator core that surrounds the rotor from the outside in a radial direction. The housing has a peripheral wall portion that surrounds the stator from the outside in a radial direction. The peripheral wall portion includes a fixing surface that contacts the outer circumferential surface of the stator core and extends in the circumferential direction, a holding portion located on at least one side of the fixing surface in the axial direction and extending in the circumferential direction, and a diameter of the fixing surface. A flow path located on the outside in the direction. Sealing portions that extend in the circumferential direction and seal between the peripheral wall portion and the stator core are provided on both sides of the fixed surface in the axial direction. The rotating electric machine, wherein at least one of the sealing parts is held by the holding part.
(2) According to (1), the holding part has a radial holding surface facing the stator core in a radial direction, and the sealing part is filled between the radial holding surface and the stator core. The rotating electric machine described.
(3) The peripheral wall portion includes, as the holding portions, a first holding portion located on one axial side of the fixing surface, and a second holding portion located on the other axial side of the fixing surface. The rotating electric machine according to (2).
(4) The holding portion is a groove portion that is recessed radially outward from the inner circumferential surface of the peripheral wall portion and has a first surface facing inward in the radial direction, and the holding portion extends in the circumferential direction and The rotating electric machine according to (2) or (3), wherein the surface is a portion of the first surface that faces the stator core in a radial direction.
(5) The holding portion has a second surface facing inward in the radial direction, and a third surface connecting the second surface and the fixing surface and facing in the axial direction, and the radial holding surface has a second surface facing inward in the radial direction. The rotating electric machine according to (2) or (3), which is a portion of the second surface that faces the stator core in the radial direction.
(6) The first holding portion is a groove portion that is recessed radially outward from the inner circumferential surface of the peripheral wall portion and has a first surface facing radially inward, and the radial holding surface of the first holding portion is , the second holding portion is a portion of the first surface that faces the stator core in the radial direction, and the second holding portion connects the second surface facing inward in the radial direction, and the second surface and the fixed surface and The rotation according to (3), wherein the radial holding surface of the second holding portion is a portion of the second surface that faces the stator core in the radial direction. Electric machine.
(7) The rotating electric machine according to (1), wherein the peripheral wall portion has a support surface that contacts an axially facing surface of the stator core on a radially inner side of the outer peripheral surface of the stator core.
(8) The holding part has an axial holding surface facing the stator core in the axial direction, and the sealing part is filled between the axial holding surface and the stator core. The rotating electric machine described.
(9) The rotating electric machine according to (8), wherein the holding portion is arranged radially inside the support surface.
(10) The rotating electrical machine according to (9), wherein the axial holding surface is an inclined surface that is positioned axially away from the stator core as it goes radially inward.
(11) The rotating electric machine according to (9), wherein the axial holding surface is disposed at a position further away from the stator core in the axial direction than the supporting surface, and faces an axially facing surface of the stator core.
(12) The rotating electric machine according to (7) or (8), wherein the holding portion is arranged radially outward of the support surface.
(13) The rotating electric machine according to (12), wherein the holding portion is a groove extending in the circumferential direction.
(14) The rotating electric machine according to (13), wherein the holding portion has an arc shape when viewed in the circumferential direction.
(15) The rotating electric machine according to (1), wherein the peripheral wall portion has a plurality of the holding portions on at least one side of the fixed surface in the axial direction.
(16) The peripheral wall portion includes, as the holding portions, a first holding portion located on one axial side of the fixing surface, and a second holding portion located on the other axial side of the fixing surface. The first holding part has a radial holding surface facing the stator core in the radial direction, the sealing part is filled between the radial holding surface and the stator core, The rotating electric machine according to (1), wherein the holding part has an axial holding surface facing the stator core in the axial direction, and the sealing part is filled between the axial holding surface and the stator core. .
(17) The peripheral wall portion has a support surface that contacts an axially facing surface of the stator core on a radially inner side than the outer peripheral surface of the stator core, and the support surface is located on the other side of the stator core in the axial direction than the fixed surface. The rotating electric machine according to (16), wherein the first holding part is arranged on the side and has a larger dimension in the axial direction than the second holding part.
(18) An inverter that supplies power to the stator, and a connection member that electrically connects the inverter and the stator, the connection member being disposed on one side in the axial direction with respect to the fixed surface, The peripheral wall portion includes, as the holding portion, a first holding portion located on one axial side of the fixing surface, and a second holding portion located on the other axial side of the fixing surface, According to any one of (1) to (17), the volume of the sealing part held by the first holding part is larger than the volume of the sealing part held by the second holding part. rotating electric machine.
(19) The rotating electric machine according to any one of (1) to (18), wherein the stator core is fixed to the fixed surface by shrink fitting.
(20) The rotating electric machine according to any one of (1) to (19), wherein the housing is impregnated with resin.
(21) A drive device comprising the rotating electrical machine according to any one of (1) to (20) and a transmission mechanism connected to the rotating electrical machine.

1,201,301,401,501,601,701,801... Drive device, 2,202,302,402,502,602,702,802... Rotating electric machine, 3... Transmission mechanism, 8... Inverter, 10,210 , 310, 410, 510, 610, 710, 810... Housing, 12, 212, 312, 412, 512, 612, 712, 812... Surrounding wall portion, 12b, 212b, 312b, 412b, 512b, 612b, 712b, 812b... Fixed surface, 12h, 212h, 312h, 712h, 812h... Support surface, 30... Rotor, 40... Stator, 41... Stator core, 50... Channel, 60, 260, 360, 460, 560, 660, 760, 860... Holding Part, 61, 261... Holding part (first holding part), 61a, 463a... Second surface, 61b, 463b... Third surface, 62, 262, 464, 664,... Radial direction holding surface, 63, 263, 363 , 463, 663, 763, 863a... Holding part (second holding part), 863b... Holding part (third holding part), 64, 264, 364, 764, 864a, 864b... Axial direction holding surface, 90... Connection member , 95,295,395,495,595,695,795,895...Sealing portion, 261a, 663a...First surface, J1...Central axis line

Claims (21)

a rotor that can rotate around a central axis;
a stator disposed radially outward of the rotor;
a housing that houses the rotor and the stator therein;
Equipped with
The stator has a stator core that surrounds the rotor from the outside in a radial direction,
The housing has a peripheral wall portion surrounding the stator from the outside in a radial direction,
The peripheral wall portion is
a fixing surface that contacts the outer peripheral surface of the stator core and extends in the circumferential direction;
a holding portion located on at least one side of the fixed surface in the axial direction and extending in the circumferential direction;
a flow path located on the radially outer side of the fixed surface,
Sealing portions extending in the circumferential direction and sealing between the peripheral wall portion and the stator core are provided on both sides of the fixed surface in the axial direction,
The rotating electric machine, wherein at least one of the sealing parts is held by the holding part. The holding portion has a radial holding surface that faces the stator core in a radial direction,
The rotating electric machine according to claim 1, wherein the sealing portion is filled between the radial holding surface and the stator core. The peripheral wall portion serves as the holding portion,
a first holding portion located on one side in the axial direction of the fixing surface;
a second holding part located on the other axial side of the fixing surface;
The rotating electrical machine according to claim 2, comprising: The holding portion is a groove portion that is recessed radially outward from the inner circumferential surface of the peripheral wall portion and has a first surface facing radially inward,
The holding portion extends in the circumferential direction,
The rotating electric machine according to claim 2 or 3, wherein the radial holding surface is a portion of the first surface that faces the stator core in the radial direction. The holding portion has a second surface facing inward in the radial direction, and a third surface connecting the second surface and the fixing surface and facing in the axial direction,
The rotating electrical machine according to claim 2 or 3, wherein the radial holding surface is a portion of the second surface that faces the stator core in the radial direction. The first holding portion is a groove portion that is recessed radially outward from the inner circumferential surface of the peripheral wall portion and has a first surface facing radially inward,
The radial holding surface of the first holding part is a portion of the first surface that faces the stator core in the radial direction,
The second holding part has a second surface facing inward in the radial direction, and a third surface connecting the second surface and the fixing surface and facing in the axial direction,
The rotating electric machine according to claim 3, wherein the radial holding surface of the second holding portion is a portion of the second surface that faces the stator core in the radial direction. The rotating electric machine according to claim 1, wherein the peripheral wall portion has a support surface that contacts an axially facing surface of the stator core on a radially inner side of the outer peripheral surface of the stator core. The holding portion has an axial holding surface facing the stator core in the axial direction,
The rotating electrical machine according to claim 7, wherein the sealing portion is filled between the axial holding surface and the stator core. The rotating electrical machine according to claim 8, wherein the holding portion is arranged radially inside the support surface. The rotating electric machine according to claim 9, wherein the axial holding surface is an inclined surface that is positioned axially away from the stator core as it goes radially inward. The rotating electric machine according to claim 9, wherein the axial holding surface is disposed at a position further away from the stator core in the axial direction than the supporting surface, and faces an axially facing surface of the stator core. The rotating electric machine according to claim 8, wherein the holding portion is arranged radially outside the support surface. The rotating electric machine according to claim 12, wherein the holding portion is a groove extending in the circumferential direction. The rotating electric machine according to claim 13, wherein the holding portion has an arc shape when viewed in the circumferential direction. The rotating electric machine according to claim 1, wherein the peripheral wall portion has a plurality of the holding portions on at least one side of the fixed surface in the axial direction. The peripheral wall portion serves as the holding portion,
a first holding portion located on one side in the axial direction of the fixing surface;
a second holding part located on the other axial side of the fixing surface;
has
The first holding part has a radial holding surface that faces the stator core in a radial direction,
The sealing portion is filled between the radial holding surface and the stator core,
The second holding part has an axial holding surface facing the stator core in the axial direction,
The rotating electric machine according to claim 1, wherein the sealing portion is filled between the axial holding surface and the stator core. The peripheral wall portion has a support surface that contacts an axially facing surface of the stator core at a radially inner side than an outer peripheral surface of the stator core,
The support surface is arranged on the other side in the axial direction than the fixed surface,
The rotating electrical machine according to claim 16, wherein the first holding portion has a larger dimension than the second holding portion in the axial direction. an inverter that supplies power to the stator; and a connection member that electrically connects the inverter and the stator;
The connecting member is arranged on one side in the axial direction than the fixing surface,
The peripheral wall portion serves as the holding portion,
a first holding portion located on one side in the axial direction of the fixing surface;
a second holding part located on the other axial side of the fixing surface;
has
The rotating electric machine according to claim 1, wherein a volume of the sealing part held by the first holding part is larger than a volume of the sealing part held by the second holding part. The rotating electrical machine according to claim 1, wherein the stator core is fixed to the fixed surface by shrink fitting. The rotating electric machine according to claim 1, wherein the housing is impregnated with resin. A rotating electrical machine according to claim 1;
A drive device comprising: a transmission mechanism connected to the rotating electric machine.

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