CN117335601A

CN117335601A - Rotary motor and driving device

Info

Publication number: CN117335601A
Application number: CN202310594533.6A
Authority: CN
Inventors: 川畑雄平; 大菅祥平; 上谷卓宽; 斋藤裕也; 高山翔吾; 山内睦
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2022-06-30
Filing date: 2023-05-24
Publication date: 2024-01-02
Also published as: JP2024006098A

Abstract

The rotating electrical machine of the present invention includes: a rotor rotatable about a central axis; a stator disposed radially outward of the rotor; and a housing that houses the rotor and the stator therein. The stator has a stator core surrounding the rotor from the radially outer side. The housing has a peripheral wall portion surrounding the stator from the radially outer side. The peripheral wall part has: a fixing surface which is in contact with the outer peripheral surface of the stator core and extends in the circumferential direction; a holding portion which is located at least on one side in the axial direction from the fixing surface and extends in the circumferential direction; and a flow path located radially outward of the fixing surface. Sealing portions are provided on both sides of the fixing surface in the axial direction, extend in the circumferential direction, and seal between the peripheral wall portion and the stator core. At least one sealing portion is held by the holding portion.

Description

Rotary motor and driving device

Technical Field

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

Background

In recent years, development of a rotary electric machine for driving mounted on a vehicle such as an electric car has been actively conducted. The rotating electrical machine is provided with a cooling structure. Patent document 1 discloses a structure in which a water path for circulating cooling water inside a casing holding a stator is provided, and a rotating electric machine is cooled by the casing.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 2007-143246

Disclosure of Invention

Technical problem to be solved by the invention

In the rotating electrical machines mounted in electric vehicles and the like as described above, high durability is required that can cope with difficult traffic roads and various climatic conditions.

In view of the above, an object of the present invention is to provide a driving device having high durability and a driving device provided with the rotating electric machine.

Technical proposal adopted for solving the technical problems

One embodiment of the rotating electrical machine of the present invention includes: a rotor rotatable about a central axis; a stator disposed radially outward of the rotor; and a housing that houses the rotor and the stator therein. The stator has a stator core surrounding the rotor from a radially outer side. The housing has a peripheral wall portion surrounding the stator from a radially outer side. The peripheral wall portion has: a fixing surface that is in contact with an outer peripheral surface of the stator core and extends in a circumferential direction; a holding portion that is located at least one side in an axial direction from the fixing surface and extends in a circumferential direction; and a flow path located radially outward of the fixed surface. Sealing portions are provided on both sides of the fixing surface in the axial direction, the sealing portions extending in the circumferential direction and sealing between the peripheral wall portion and the stator core. At least one of the seal portions is held by the holding portion.

One embodiment of the driving device of the present invention includes: the rotating electrical machine; and a transmission mechanism connected to the rotating electric machine.

Effects of the invention

According to one embodiment of the present invention, durability of the rotating electric machine and the driving device can be improved.

Drawings

Fig. 1 is a schematic diagram showing a driving device of a first embodiment.

Fig. 2 is a cross-sectional view showing a part of the driving device of the first embodiment.

Fig. 3A is a cross-sectional view showing a stator fixing process of the driving device of the first embodiment.

Fig. 3B is another cross-sectional view showing a stator fixing process of the driving device of the first embodiment.

Fig. 3C is a cross-sectional view showing another stator fixing process of the driving device of the first embodiment.

Fig. 3D is another cross-sectional view showing another stator fixing process of the driving device of the first embodiment.

Fig. 4 is a cross-sectional view showing a part of the driving device of the second embodiment.

Fig. 5 is a cross-sectional view showing a part of a driving device of a third embodiment.

Fig. 6 is a cross-sectional view showing a part of a driving device of a fourth embodiment.

Fig. 7 is a cross-sectional view showing a part of a driving device of a fifth embodiment.

Fig. 8 is a cross-sectional view showing a part of a driving device of a sixth embodiment.

Fig. 9 is a cross-sectional view showing a part of a driving device of a seventh embodiment.

Fig. 10 is a cross-sectional view showing a part of a driving device of the eighth embodiment.

(symbol description)

1. 201, 301, 401, 501, 601, 701, 801 drive means; 2. 202, 302, 402, 502, 602, 702, 802 rotating electrical machines; 3a transmission mechanism; 8 an inverter; 10. 210, 310, 410, 510, 610, 710, 810 housings; 12. 212, 312, 412, 512, 612, 712, 812 peripheral wall portions; 12b, 212b, 312b, 412b, 512b, 612b, 712b, 812b fixation surfaces; 12h, 212h, 312h, 712h, 812h bearing surfaces; 30 rotors; a 40 stator; 41 a stator core; a 50 flow path; 60. 260, 360, 460, 560, 660, 760, 860 holders; 61. 261 holding portion (first holding portion); 61a, 463a second face; 61b, 463b third face; 62. 262, 464, 664 radial retention surfaces; 63. 263, 363, 463, 663, 763, 863a holding portion (second holding portion); 863b holding portion (third holding portion); 64. 264, 364, 764, 864a, 864b axial retention surfaces; 90 connecting members; 95. 295, 395, 495, 595, 695, 795, 895 seals; 261a, 663a first face; j1 central axis

Detailed Description

In the following description, a description will be given of a vertical direction with reference to a positional relationship in a case where the driving device of the embodiment is mounted on a vehicle on a horizontal road surface. That is, at least in the case where the driving device is mounted on a vehicle on a horizontal road surface, the relative positional relationship with respect to the vertical direction described in the following embodiment may be satisfied.

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 arrow of the Z axis is directed (+z side) is the vertical direction upper side, and the opposite side (-Z side) of the side toward which the arrow of the Z axis is directed is the vertical direction lower side. In the following description, the upper side in the vertical direction will be simply referred to as "upper side", and the lower side in the vertical direction will be simply referred to as "lower side".

The central axis J1 appropriately shown in the drawing 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, a direction parallel to the central axis J1 is simply referred to as an "axial direction", a radial direction centered on the central axis J1 is simply referred to as a "radial direction", and a circumferential direction centered on the central axis J1 is simply referred to as a "circumferential direction". The side toward which the arrow of the Y axis in the axial direction is directed (+y side) is referred to as "axial side", and the side opposite to the side toward which the arrow of the Y axis is directed in the axial direction (-Y side) is referred to as "axial other side". The arrow θ appropriately shown in the figure indicates the circumferential direction.

In the following description, "the face is directed to the a direction" includes a case where the face is spread strictly in a direction orthogonal to the a direction and the face is directed strictly to the a direction, and also includes a case where the direction in which the face is directed has an a direction component. The term "the face faces the B in the a direction" includes a case where the face is strictly spread in a direction orthogonal to the a direction and the face is strictly opposed to the B in the a direction, and also includes a case where the face has an a direction component in a direction and the face overlaps the B when viewed along the a direction.

< first embodiment >, first embodiment

Fig. 1 is a schematic diagram showing a driving device 1 according to the present embodiment. Fig. 1 is a schematic diagram only, and does not accurately show the arrangement of the parts and the dimensions of the parts.

The drive device 1 of the present embodiment is mounted on a vehicle, and is a drive device that rotates an axle of the vehicle. The vehicle equipped with the drive device 1 is a vehicle using a rotating electric machine as a power source, such as a Hybrid Electric Vehicle (HEV), a plug-in hybrid electric vehicle (PHV), and an Electric Vehicle (EV).

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

The rotating electrical machine 2 includes a rotor 30, a stator 40, a housing 10, bearings 71, 73, an inverter 8, a connecting member 90, a seal 95, and a fluid L. The housing 10 has a housing space 18 for housing the rotating electric machine 2 and the transmission mechanism 3. The storage space 18 is divided into: a motor chamber 18a for housing the rotor 30 and the stator 40; a transmission mechanism chamber 18b accommodating the transmission mechanism 3; and an inverter chamber 18c that houses the inverter 8. The motor chamber 18a is an internal space of the motor housing portion 10 a. The transmission mechanism chamber 18b is an internal space of the transmission mechanism housing portion 10 b. The inverter chamber 18c is an internal space of the inverter housing portion 10 c.

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

The rotor body 32 is fixed to the outer peripheral surface of the shaft 31. Although not shown, the rotor 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 in the axial direction. The plurality of rotor magnets are circumferentially arranged in such a manner that the magnetic poles alternate.

The stator 40 is disposed radially outward of the rotor 30. The stator 40 is fixed to the inner side surface of the housing 10. The stator 40 has a stator core 41 and a plurality of coils 42.

The stator core 41 has a substantially annular shape surrounding the rotor 30 from the radially outer side. The outer peripheral surface of the stator core 41 is fixed to a fixing surface 12b of the housing 10 described below. The plurality of coils 42 are mounted on the stator core 41 via an insulating material, not shown. The plurality of coils 42 are arranged at intervals in the circumferential direction.

The inverter 8 is housed in the inverter housing 10c. The inverter 8 is electrically connected to an external power source, not shown, and the coil 42. The inverter 8 supplies electric power to the stator 40.

The connection member 90 electrically connects the inverter 8 and the stator 40. The connection member 90 extends in a substantially vertical direction (Z-axis direction). The connection member 90 is disposed on one axial side (+y side) of the fixing surface 12b. In the present embodiment, three connection members 90 are provided corresponding to the U-phase, V-phase, and W-phase coils 42 of the stator 40. The number of the connection members 90 is not limited to three, and for example, six or nine may be provided. The connection member 90 is made of a metal material having a bottom resistivity such as a copper alloy.

The housing 10 accommodates the rotor 30, the stator 40, the transmission mechanism 3, and the inverter 8. The housing 10 includes a motor housing portion 10a, a transmission mechanism housing portion 10b, and an inverter housing portion 10c. The motor housing 10a houses the rotor 30 and the stator 40 therein. The transmission mechanism housing section 10b houses the transmission mechanism 3 therein. The inverter housing 10c houses the inverter 8 therein. The transmission mechanism housing portion 10b is disposed on the other axial side (-Y side) of the motor housing portion 10a, and is connected to the motor housing portion 10a in the axial direction. The inverter housing portion 10c is disposed on the upper side (+z side) of the motor housing portion 10a, and is connected to the motor housing portion 10a in the vertical direction (Z axis direction). The inverter housing portion 10c may be disposed on one side of the motor housing portion 10a in the axial direction or on the other side thereof, and may be connected to the motor housing portion 10a in the axial direction. The housing 10 has 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 radially outer side. 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 side (-Y side) in the axial direction 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 case 82 is located on the upper side (+z side) of the first case member 11, and is fixed to the first case 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 portion 10 a. The first housing member 11 constitutes a portion of the lower side (-Z side) of the inverter housing section 10 c. The first housing member 11 has a peripheral wall portion 12, an inflow port 58, and an outflow port 59.

The peripheral wall 12 has a substantially cylindrical shape centered on the central axis J1. The peripheral wall 12 opens to one side in the axial direction (+y side) and the other side in the axial direction (-Y side). The peripheral wall 12 surrounds the rotor 30 and the stator 40 from the radially outer side. The peripheral wall 12 includes a first wall 12c, a fixing portion 12a, a second wall 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 is described in detail in the following paragraphs.

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 fixing portion 12a is a portion of the peripheral wall portion 12 located substantially in the center in the axial direction. The fixing portion 12a is radially opposed to the stator core 41. An end portion of one axial side (+y side) of the fixing portion 12a is connected to an end portion of the other axial side (-Y side) of the first wall portion 12 c. In the present embodiment, the inner diameter of the fixing portion 12a is smaller than the inner diameter of the first wall portion 12 c.

The fixing portion 12a has a fixing surface 12b. The fixing surface 12b is an inner peripheral surface of the fixing portion 12 a. The fixing surface 12b faces radially inward. The fixing surface 12b extends in the circumferential direction. As shown in fig. 2, the fixing surface 12b is in contact with the outer peripheral surface of the stator core 41. The other end portion (-Y side) of the fixing surface 12b in the axial direction coincides with the other end portion of the stator core 41 in the axial direction. On the other hand, the end portion of the fixing surface 12b on one axial side (+y side) is located on the other axial side from the end portion of the stator core 41 on one axial side. Therefore, the axial dimension of the fixing surface 12b is smaller than the axial dimension of the stator core 41. In the present embodiment, the stator core 41 is thermally fixed to the fixing surface 12b. Thereby, the stator core 41 is firmly fixed to the housing 10. The stator core 41 may be fixed to the fixing surface 12b by press-fitting other than heat fitting, or may be fixed to the fixing surface 12b by adhesion.

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

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 of the fixing 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 facing one axial direction (+y side) of the outer surfaces of the support portions 12g. The support surface 12h contacts the surface of the stator core 41 facing the axial direction radially inward of the outer peripheral surface of the stator core 41. In the present embodiment, the support surface 12h is in contact with the surface of the stator core 41 facing the other side (-Y side) in the axial direction. Therefore, according to the present embodiment, the position of the stator 40 in the axial direction with respect to the housing 10 can be accurately determined.

As shown in fig. 1, the flow path 50 is a flow path through which the fluid L flows. The fluid L cools the stator 40 and the inverter 8. In the present embodiment, the fluid L is water. The flow path 50 is provided inside the peripheral wall portion 12. The flow path 50 is located radially outward of the fixed surface 12b. Therefore, the flow path 50 is provided at least inside the fixing portion 12 a. The flow path 50 is provided over an end portion on one axial side (+y side) to an end portion on the other axial side (-Y side) of the peripheral wall portion 12. The flow path 50 extends in the circumferential direction inside the peripheral wall portion 12, and is provided circumferentially around the circumference. As described above, the stator core 41 is fixed to the fixing 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 12.

The inlet 58 and the outlet 59 are holes penetrating the peripheral wall 12 radially outward of the flow path 50. The inflow port 58 and the outflow port 59 are connected to the flow path 50, respectively. The inflow port 58 is provided at a portion above the peripheral wall portion 12 (+z side). The outflow port 59 is provided at a portion of the lower side (-Z side) of the peripheral wall portion 12. The fluid L flows into the flow path 50 through the inflow port 58 and flows out of the flow path 50 through the outflow port 59. The positions at which the inflow port 58 and the outflow port 59 are provided are not limited to the present embodiment, and the inflow port 58 may be provided at the lower side of the peripheral wall 12, and the outflow port 59 may be provided at the upper side of the peripheral wall 12. Further, both the inlet 58 and the outlet 59 may be provided above the peripheral wall portion 12, and both the inlet 58 and the outlet 59 may be provided below the peripheral wall portion 12.

In the present embodiment, the first housing member 11 is made of metal. The first housing member 11 is molded by casting. The first housing member 11 is impregnated with resin. Therefore, according to the present embodiment, the resin can be impregnated into the hole or the like of the first housing member 11, and therefore, the strength of the first housing member 11 can be improved. In the manufacturing process of the driving device 1 of the present embodiment, the step of impregnating the first housing member 11 with the resin is a step before a stator fixing step Pf1 described below of fixing the stator 40 to the first housing member 11. The step of impregnating the first housing member 11 with the resin may be a step subsequent to the stator fixing step Pf 1.

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 an end portion of the flow path 50 on one axial side. The second housing member 13 constitutes a part of one side in the axial direction of the motor housing portion 10 a. The second housing member 13 has: a cover portion 13a extending along a plane orthogonal to the central axis J1; and a bearing holding portion 13d provided in the cover portion 13a. The bearing holding portion 13d holds the bearing 71. The second housing member 13 may not close the end portion on the one axial side of the flow path 50. In this case, one end of the flow path 50 in the axial direction is connected to another flow path provided separately.

The third housing member 14 closes off the opening on the other side (-Y side) in the axial direction of the first housing member 11. The third housing member 14 closes the end portion on the other axial side of the flow path 50. The third housing member 14 constitutes the other axial side portion of the motor housing portion 10a and the one axial side (+y side) portion of the transmission mechanism housing portion 10 b. The third housing member 14 has: an opposing wall portion 14a extending along a plane orthogonal to the central axis J1; a bearing holding portion 14c provided on the opposing wall portion 14a; and a first hole portion 14d. The portion of the opposite wall portion 14a on the lower side (-Z side) is located on the lower side than the first housing member 11. The bearing holding portion 14c holds the bearing 73. The first hole portion 14d is a hole penetrating the opposing wall portion 14a in the axial direction. The first hole 14d may be located below the first housing member 11, and the third housing member 14 may not close the end portion of the flow path 50 on the other axial side. In this case, the other end portion in the axial direction of the flow path 50 is connected to another flow path provided separately.

The fourth housing member 15 is disposed on the other side (-Y side) in the axial direction of the third housing member 14. The fourth housing member 15 has a cylindrical shape that opens to one axial side. 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 10 b. The transmission mechanism 3 is housed inside the fourth housing member 15. The fourth housing member 15 has a second hole portion 15a. The second hole portion 15a is a hole penetrating the fourth housing member 15 in the axial direction. The second hole portion 15a overlaps the first hole portion 14d as viewed in the axial direction.

The inverter case 82 is disposed on the upper side (+z side) of the first case member 11. The inverter case 82 is fixed to the first case member 11. The inverter case 82 has a box shape opening downward. The inverter housing 82 constitutes a part of the inverter housing 10 c. The inverter case 82 has an inverter flow path 85, an inverter inlet 88, and an inverter outlet 89.

The inverter flow path 85 is provided in the inverter chamber 18c. The fluid L flows through the inverter flow path 85. The inverter inlet 88 is located at an upstream end of the inverter flow path 85. The inverter outflow port 89 is located at the downstream end of the inverter flow path 85. The inverter outflow port 89 is connected to the inflow port 58. The fluid L flows into the inverter flow path 85 from the inverter flow inlet 88. In the inverter flow path 85, the fluid L flows in the vicinity of 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 accommodated in the transmission mechanism chamber 18b. The transmission mechanism 3 is connected to the shaft 31. The transmission mechanism 3 includes a reduction gear 4 and a differential gear 5. The power output from the rotor 30 is transmitted to the output shaft 6 via the reduction gear 4 and the differential gear 5.

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

The differential device 5 is connected to the reduction gear 4 and the 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 the present embodiment, the output shaft 6 is an axle of a 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 the left and right wheels. The differential device 5 has a ring gear 5a. The ring gear 5a is rotatable about the output axis J2. The power output from the rotor 30 is transmitted to the ring gear 5a via the reduction gear 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 seal 95 extends in the circumferential direction and is provided circumferentially throughout. In the present embodiment, two sealing portions 95 are provided. The seal portions 95 are provided on both sides in the axial direction with respect to the fixing surface 12 b. The seal portion 95a is disposed on one axial side (+y side) of the fixing surface 12 b. The other seal portion 95b is disposed axially on the other side (-Y side) of the fixed surface 12 b. In the present embodiment, the sealing portion 95 is a liquid gasket. The sealing portions 95a and 95b are held by the holding portion 60. The sealing portions 95a and 95b are in a liquid state when uncured, and adhere to the peripheral wall portion 12 and the stator core portion 41 by curing.

The holding portion 60 is a part of the inner side surface of the peripheral wall portion 12. The holding portion 60 extends in the circumferential direction and is provided circumferentially throughout. The holding portions 60 are provided on both sides of the fixing surface 12b in the axial direction. In the present embodiment, the peripheral wall portion 12 has a first holding portion 61 and a second holding portion 63 as the holding portion 60. The holding portion 60 has holding surfaces 62, 64 opposed to the stator core 41. In more detail, the first holding portion 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) from the fixing surface 12 b. The first holding portion 61 is an inner side surface of the first wall portion 12 c. The first holding portion 61 has a second surface 61a and a third surface 61b. The second surface 61a is a portion of the radially inward facing surface of the inner side surface of the first wall portion 12c, and is a portion in contact with the seal portion 95 a. The third surface 61b is a surface facing one axial direction side of the inner surface of the fixing portion 12 a. The third surface 61b connects the end of the second surface 61a on the other side (-Y side) in the axial direction to the fixing surface 12 b.

In the present embodiment, the first holding surface 62 is a portion of the second surface 61a that is opposed to the stator core 41 in the radial direction. The first holding surface 62 is a radial holding surface that is radially opposed to the stator core 41.

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

The second holding portion 63 is located axially on the other side (-Y side) of the fixing surface 12 b. The second holding portion 63 is a portion of the inner side surface of the second wall portion 12f, and is a portion in contact with the sealing portion 95 b. The second holding portion 63 is disposed radially inward of the support surface 12 h. The second holding surface 64 is a surface connecting an end portion on the inner side in the radial direction of the support surface 12h and an end portion on one side (+y side) in the axial direction of the inner peripheral surface of the support portion 12 g. In the present embodiment, the second holding surface 64 is an inclined surface located in a direction away from the stator core 41 in the axial direction as going radially inward. The second holding surface 64 is axially opposite to the surface of the stator core 41 facing the other axial side. The second holding surface 64 is an axial holding surface axially opposed to the stator core 41. According to the present 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 other side of the support portion 12g facing the one side in the axial direction, and therefore, a decrease in the strength of the support portion 12g in the axial direction can be suppressed. Therefore, the position of the stator 40 in the axial direction can be accurately determined by the support portion 12 g.

Further, since the second holding portion 63 is disposed radially inward of the support surface 12h as described above, for example, a reduction in the axial strength of the support portion 12g can be suppressed as compared with a case where a groove recessed toward the other side in the axial direction is provided as the second holding portion at a portion radially inward of the support surface 12h of the support portion 12 g. Therefore, the position of the stator 40 in the axial direction can be accurately determined by the support portion 12 g.

The sealing portion 95b is filled between the second holding surface 64, i.e., the axial holding surface, and the stator core 41. The seal portion 95b is held by the second holding surface 64. Thereby, the sealing portion 95b is held by the second holding portion 63. The seal portion 95b is disposed axially between the second holding surface 64 and a surface of the stator core 41 facing the other side in the axial direction (-Y side), and contacts both the second holding surface 64 and a surface of the stator core 41 facing the other side in the axial direction. The sealing portion 95b seals between the peripheral wall portion 12 and the stator core 41 at the other side in the axial direction than the fixing surface 12 b. As described above, the sealing portion 95a seals between the peripheral wall portion 12 and the stator core 41 on the axial side (+y side) than the fixing surface 12 b. Therefore, according to the present embodiment, the sealing portions 95a and 95b seal the space between the peripheral wall portion 12 and the stator core 41 on both sides in the axial direction of the fixing surface 12 b. Further, the stator core 41 can be firmly fixed to the housing 10. In addition, in the event that the fluid L or the like enters the interior of the casing 10, the space between the stator core 41 and the peripheral wall 12 is sealed by the sealing portions 95a and 95b, so that the fluid L or the like can be sealed between the stator core 41 and the peripheral wall 12. Therefore, the adhesion of the fluid L or the like to the stator 40, the connecting member 90, the inverter 8, and the like can be suppressed. Therefore, it is possible to suppress a decrease in the driving performance of the rotary electric machine 2 and the driving device 1, and to improve the durability and reliability of the rotary electric machine 2 and the driving device 1.

As described above, the stator core 41 is thermally fixed to the fixing surface 12 b. According to the present embodiment, as described above, the sealing portions 95a and 95b can seal the space between the peripheral wall portion 12 and the stator core 41 on both axial sides of the fixing surface 12b, and therefore, the stator core 41 can be firmly fixed to the housing 10. In addition, in the event that the fluid L or the like enters the interior of the casing 10, the space between the stator core 41 and the peripheral wall 12 is sealed by the sealing portions 95a and 95b, so that the fluid L or the like can be sealed between the stator core 41 and the peripheral wall 12. Therefore, a decrease in the driving performance of the rotary electric machine 2 and the driving device 1 can be suppressed.

The support surface 12h is disposed on the other axial side (-Y side) than the fixing surface 12 b. As described above, the bearing surface 12h contacts the surface of the stator core 41 facing the other side in the axial direction, and determines the position of the stator core 41 in the axial direction with respect to the housing 10. The axial dimension of the stator core 41 is toleranced, and furthermore, the axial dimension between the support surface 12h and the first holding portion 61 is toleranced. Therefore, the relative position of the first holding portion 61 and the end portion on one axial side (+y side) of the stator core 41 is more likely to be deviated in the axial direction than the relative position of the second holding portion 63 and the end portion on the other axial side of the stator core 41. According to the present embodiment, the dimension L11 of the first holding portion 61 is larger than the dimension L12 of the second holding portion 63 in the axial direction. Therefore, the axial dimension of the first holding portion 61 can be made large, and therefore, the sealing portion 95a held by the first holding portion 61 can be brought into stable contact with the stator core 41. Therefore, the stator core 41 can be firmly fixed to the housing 10 on the axial side of the fixing surface 12 b. Further, since the space between the stator core 41 and the peripheral wall 12 is sealed by the sealing portions 95a and 95b, the fluid L and the like are sealed between the stator core 41 and the peripheral wall 12.

According to the present embodiment, the volume of the seal portion 95a held by the first holding portion 61 is larger than the volume of the seal portion 95b held by the second holding portion 63, and therefore, the sealing performance of the seal portion 95a can be improved. Therefore, the stator core 41 can be firmly fixed to the housing 10 on the axial side (+y side) of the fixing surface 12 b. Further, since the space between the stator core 41 and the peripheral wall 12 is sealed by the sealing portions 95a and 95b, the fluid L and the like are sealed between the stator core 41 and the peripheral wall 12. Therefore, the adhesion of the fluid L to the connection member 90 arranged on the axial side of the stator core 41 can be further appropriately suppressed. Therefore, the short circuit of the connecting member 90 can be further appropriately suppressed, and the reduction in the driving performance of the rotating electrical machine 2 and the driving device 1 can be further appropriately suppressed.

Next, in the present embodiment, a stator fixing step Pf1 of fixing the stator 40 to the first housing member 11 will be described. The stator fixing step Pf1 is a part of the manufacturing steps of the rotating electric machine 2 and the driving device 1. The stator fixing process Pf1 includes: a first step Pf11 of applying an uncured seal 95 to the stator core 41; a second step Pf12 of inserting the stator 40 into the first housing member 11; a third step Pf13 of fixing the stator 40 to the first housing member 11; and a fourth step Pf14 of curing the sealing portion 95. As described above, the stator core 41 is thermally fixed to the fixing surface 12 b. In the present specification, "worker and the like" include workers performing respective works, assembling devices, and the like. Each operation may be performed by only the operator, by only the assembling device, or by both the operator and the assembling device.

In the first step Pf11, an operator or the like applies an uncured seal portion 95 to the outer surface of the stator core 41 on which the coil 42 is previously mounted via an insulating material, not shown. As shown in fig. 3A, an operator or the like applies an uncured seal portion 95a to an edge portion on one axial side (+y side) of the outer peripheral surface of the stator core 41 so as to extend circumferentially around the periphery. The operator or the like applies the uncured seal portion 95b to the outer edge portion of the surface of the stator core 41 facing the other side (-Y side) in the axial direction so as to extend circumferentially.

In the second step Pf12, the operator or the like first heats the first housing member 11. The inner diameter of the peripheral wall portion 12 becomes large due to thermal expansion of the first housing member 11. At this time, the inner diameter of the fixing 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 toward the other axial side (-Y side), and inserts the stator 40 into the first housing member 11. As described above, since the inner diameter of the fixing 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 of the stator core 41 facing the other axial side contacts the support surface 12h, the second process Pf12 ends. At this time, the uncured seal portion 95a is filled between the first holding surface 62 and the stator core 41, and the uncured seal portion 95b is filled between the second holding surface 64 and the stator core 41. According to the present embodiment, the first holding portion 61 has: a second surface 61a facing radially inward and opposed to the stator core 41; and a third surface 61b that connects the second surface 61a and the fixing surface 12b and faces one side in the axial direction, the uncured seal portion 95a can be caught by the third surface 61b in the axial direction, and the uncured seal portion 95a can be properly filled between the first holding surface 62 and the stator core 41. Therefore, by the operation of moving the stator 40 to the other side in the axial direction alone, the uncured seal portion 95a can be filled between the first holding surface 62 and the stator core 41, and an increase in the number of operations in the stator fixing process Pf1 can be suppressed.

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

In the fourth step Pf14, the operator or the like cures the sealing portions 95a and 95 b. When the cured seal portion 95a is held by the first holding portion 61 and the cured seal portion 95b is held by the second holding portion 63, the stator fixing process Pf1 ends. The fourth step Pf14 is a step of selecting the content of the operation according to the type of the sealing portion 95, and for example, when the sealing portion 95 is made of an ultraviolet-curable material, ultraviolet rays are irradiated as the fourth step Pf 14.

In the present embodiment, the fixing step of fixing the stator 40 to the first housing member 11 may be a stator fixing step Pf2 described below. The stator fixing process Pf2 includes: a first step Pf21 of applying the seal 95 to the stator core 41; a second step Pf22 of inserting the stator 40 into the first housing member 11; a third step Pf23 of fixing the stator 40 to the first housing member 11; a fourth step Pf24 of filling the sealing portion 95a between the first holding surface 62 and the stator core 41; and a fifth step Pf25 of curing the sealing portion 95.

In the first step Pf21, as shown in fig. 3C, the operator or the like applies the uncured seal portion 95a to the outer edge portion of the surface of the stator core 41 facing one side in the axial direction (+y side) so as to extend all around the circumferential direction. The other operations of the first step Pf21 are the same as those of the first step Pf 11.

In the second step Pf22, as shown in fig. 3D, the stator 40 is inserted into the first housing member 11 until the surface of the stator core 41 facing the other side in the axial direction contacts the support surface 12h by the same operation as the second step Pf 12.

In the third step Pf23, the worker or the like cools the first housing member 11 by the same operation as in the third step Pf13, and fixes the stator core 41 to the fixing surface 12b.

In the fourth step Pf24, the worker or the like fills the uncured seal portion 95a between the first holding surface 62 and the stator core 41 by the leveling member 96.

In the fifth step Pf26, the sealing portions 95a and 95b are cured by the same operation as in the fourth step Pf 14. When the cured seal portion 95a is held by the first holding portion 61 and the cured seal portion 95b is held by the second holding portion 63, the stator fixing process Pf2 ends.

Further, if the peripheral wall portion 12 and the stator core 41 can be sealed between the both axial sides of the fixing surface 12b, the holding portion 60 need not be provided on both axial sides of the fixing surface 12b, and may be provided on only one axial side (+y side) and the other axial side (-Y side) of the fixing surface 12 b. For example, in the case where the second holding portion 63 is not provided, a seal portion provided on the other side in the axial direction from the fixing surface 12b may be disposed at a corner portion connecting the fixing surface 12b and the support surface 12 h. Thereby, the circumferential wall 12 and the stator core 41 can be sealed at the other side in the axial direction of the fixing surface 12 b.

< second embodiment >

Fig. 4 is a cross-sectional view showing a part of the driving device 201 of the second embodiment. In the following description, the same reference numerals are given to the same components as those of the first embodiment, and the description thereof will be omitted.

The rotating electric machine 202 of the present embodiment has a seal portion 295. The seal portion 295 has: a seal portion 295a disposed on one axial side (+y side) of the fixing surface 212b, which is an inner peripheral surface of the fixing portion 212 a; and a seal portion 295b disposed on the other side (-Y side) in the axial direction than the fixing surface 212 b.

The peripheral wall portion 212 of the first housing member 211 of the present embodiment has a holding portion 260. The peripheral wall portion 212 has a first holding portion 261 and a second holding portion 263 as the holding portion 260. The first holding portion 261 has a first holding surface 262. The second holding portion 263 has a second holding surface 264.

The first holding portion 261 is located on one axial side (+y side) of the fixing surface 212 b. The first holding portion 261 is a portion of the inner side surface of the first wall portion 212 c. The first holding portion 261 is a groove portion recessed radially outward from the inner peripheral surface of the peripheral wall portion 212. The first holding portion 261 extends in the circumferential direction and is disposed circumferentially throughout. The first holding portion 261 has a first surface 261a facing radially inward.

The first holding surface 262 is a portion of the first surface 261a that is opposite to the stator core 41 in the radial direction. The first holding surface 262 is a radial holding surface that is radially opposed to the stator core 41.

The seal portion 295a is filled between the first holding surface 262, that is, the radial holding surface, and the stator core 41. The seal portion 295a contacts both the first holding surface 262 and the outer peripheral surface of the stator core 41. The sealing portion 295a seals between the peripheral wall portion 212 and the stator core 41 on the axial side (+y side) than the fixing surface 212 b. The seal portion 295a is held by the first holding portion 261. The seal portion 295a is housed inside the first holding portion 261, that is, the groove portion recessed in the radial direction. Therefore, according to the present embodiment, the leakage of the seal portion 295a from the first holding portion 261 in the axial direction can be appropriately suppressed, and therefore, the seal portion 295a can be brought into contact with the stator core 41 more stably. Therefore, the peripheral wall 212 and the stator core 41 can be sealed more appropriately on the axial side of the fixing surface 212 b.

The second holding portion 263 is located at the other axial side (-Y side) of the fixing surface 212 b. The second holding portion 263 is a portion of the inner side surface of the second wall portion 212 f. The second holding portion 263 is a groove recessed from the other side of the support portion 212g facing the axial direction toward one side (+y side) in the axial direction. The second holding portion 263 extends in the circumferential direction and is provided circumferentially throughout. The second holding portion 263 is disposed radially outward of the support surface 212 h.

The second holding surface 264 is a surface facing one axial direction side of the inner side surface of the second holding portion 263. The second holding surface 264 is axially opposite to the surface of the stator core 41 facing the other axial side. The second holding surface 264 is an axial holding surface axially opposed to the stator core 41.

The sealing portion 295b is filled between the second holding surface 264, i.e., the axial holding surface, and the stator core 41. The seal portion 295b contacts both the second holding surface 264 and the surface of the stator core 41 facing the other side (-Y side) in the axial direction. The sealing portion 295b seals between the peripheral wall portion 212 and the stator core 41 at the other side in the axial direction than the fixing surface 212 b. The sealing portion 295b is held by the second holding portion 263. The seal portion 295b is accommodated in the second holding portion 263, i.e., the groove recessed in the axial direction. Therefore, according to the present embodiment, the leakage of the seal portion 295b from the second holding portion 263 to the radial outside can be appropriately suppressed, and therefore, the seal portion 295b can be brought into contact with the stator core 41 more stably. Therefore, the other side in the axial direction of the fixing surface 212b can more appropriately seal the space between the peripheral wall 212 and the stator core 41.

As described above, the sealing portion 295a seals between the peripheral wall portion 212 and the stator core 41 on the one axial side (+y side) than the fixing surface 212 b. Therefore, according to the present embodiment, the sealing portions 295a and 295b can seal between the peripheral wall portion 212 and the stator core 41 on both axial sides of the fixing surface 212b, and therefore, the stator core 41 can be firmly fixed to the housing 210. Since the space between the stator core 41 and the peripheral wall 212 is sealed by the sealing portions 295a and 295b, the fluid L and the like are sealed between the stator core 41 and the peripheral wall 212. Accordingly, durability and reliability of the rotary electric machine 202 and the driving device 201 can be improved.

Further, according to the present embodiment, the dimension L21 of the first holding portion 261 is larger than the dimension L22 of the second holding portion 263 in the axial direction. Therefore, the sealing portion 295a held by the first holding portion 261 can be brought into stable contact with the stator core 41, and therefore, the space between the peripheral wall portion 212 and the stator core 41 can be sealed more appropriately on the side in the axial direction than the fixing surface 212 b.

< third embodiment >

Fig. 5 is a cross-sectional view showing a part of a driving device 301 of the third embodiment. In the following description, the same reference numerals are given to the same components as those of the second embodiment, and the description thereof will be omitted.

The rotating electrical machine 302 of the present embodiment has a sealing portion 395. The sealing portion 395 includes: a seal portion 295a disposed on one axial side (+y side) of the fixing surface 312b, which is an inner peripheral surface of the fixing portion 312 a; and a seal portion 395b disposed axially opposite side (-Y side) of the fixed surface 312 b.

The peripheral wall portion 312 of the first housing member 311 of the present embodiment has a holding portion 360. The peripheral wall portion 312 has a first holding portion 261 and a second holding portion 363 as the holding portion 360. The first holding portion 261, the first holding surface 262, and the sealing portion 295a of the present embodiment are similar to the first holding portion 261, the first holding surface 262, and the sealing portion 295a of the second embodiment, and therefore, the description thereof is omitted. The second holding portion 363 has a second holding surface 364.

The second holding portion 363 is located on the other axial side (-Y side) than the fixed surface 312 b. The second holding portion 363 is a part of the inner side surface of the second wall portion 312 f. The second holding portion 363 is disposed radially outward of the support surface 312 h. The second holding portion 363 is a groove recessed in a direction between the other side in the axial direction and the outer side in the radial direction from a portion where the fixing surface 312b and the supporting surface 312h are connected. The second holding portion 363 extends in the circumferential direction and is provided circumferentially throughout. The second holding portion 363 has an arc shape when viewed in the circumferential direction. Therefore, according to the present embodiment, the second holding portion 363 can be easily provided by cutting using a cutting tool such as a drill, and an increase in the number of manufacturing steps of the rotating electric machine 302 and the driving device 301 can be suppressed, as compared with the case where the second holding portion 363 has a rectangular shape when viewed in the circumferential direction. Further, compared to the case where the second holding portion 363 has a rectangular shape when viewed in the circumferential direction, the force applied from the stator core 41 to the support portion 312g toward the other side in the axial direction can be suppressed from being applied intensively to a part of the second holding portion 363, and the support portion 312g can be suppressed from being deflected in the axial direction. Therefore, the position of the stator 40 in the axial direction can be accurately determined by the support portion 312 g.

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

The sealing portion 395b is filled between the second holding surface 364, i.e., the axial holding surface, and the stator core 41. The sealing portion 395b contacts both the second holding surface 364 and the surface of the stator core 41 facing the other side (-Y side) in the axial direction. The sealing portion 395b seals between the peripheral wall portion 312 and the stator core 41 at the other side in the axial direction than the fixing surface 312 b. The sealing portion 395b is held by the second holding portion 363. The seal portion 395b is accommodated in the second holding portion 363, i.e., the inside of the slot. Therefore, according to the present embodiment, the leakage of the seal portion 395b from the second holding portion 363 to the radial outside can be appropriately suppressed, and therefore, the seal portion 395b can be brought into contact with the stator core 41 more stably. Therefore, the other side in the axial direction of the fixing surface 312b can more appropriately seal the space between the peripheral wall portion 312 and the stator core 41.

The sealing portion 295a seals between the peripheral wall portion 312 and the stator core 41 on the axial side (+y side) than the fixing surface 312 b. Therefore, according to the present embodiment, the sealing portions 295a and 395b can seal the space between the peripheral wall portion 312 and the stator core 41 on both axial sides of the fixing surface 312b, and therefore, the stator core 41 can be firmly fixed to the housing 310. Since the space between the stator core 41 and the peripheral wall portion 312 is sealed by the sealing portions 295a and 395b, the fluid L and the like are sealed between the stator core 41 and the peripheral wall portion 312. Accordingly, durability and reliability of the rotating electric machine 302 and the driving device 301 can be improved.

Further, according to the present embodiment, the dimension L21 of the first holding portion 261 is larger than the dimension L32 of the second holding portion 363 in the axial direction. Therefore, the sealing portion 295a held by the first holding portion 261 can be brought into stable contact with the stator core 41, and therefore, the space between the peripheral wall portion 312 and the stator core 41 can be sealed more appropriately on the side in the axial direction than the fixing surface 312 b.

< fourth embodiment >, a third embodiment

Fig. 6 is a cross-sectional view showing a part of a driving device 401 of the fourth embodiment. In the following description, the same reference numerals are given to the same components as those of the first embodiment, and the description thereof will be omitted.

The rotating electrical machine 402 of the present embodiment has a sealing portion 495. The seal 495 has: a seal portion 95a disposed on one axial side (+y side) of the fixing surface 412b than the inner peripheral surface of the fixing portion 412 a; and a seal portion 495b disposed axially opposite side (-Y side) of the fixing surface 412 b.

The peripheral wall portion 412 of the first housing member 411 of the present embodiment has a holding portion 460. The peripheral wall portion 412 has a first holding portion 61 and a second holding portion 463 as the holding portion 460. The first holding portion 61, the first holding surface 62, and the sealing portion 95a of the present embodiment have the same configuration as the first holding portion 61, the first holding surface 62, and the sealing portion 95a of the first embodiment described above, and therefore, a description thereof may be omitted. The second holding portion 463 has a second holding surface 464.

The second holding portion 463 is located axially opposite (Y-side) the fixing surface 412 b. The second holding portion 463 is an inner side surface of the second wall portion 412 f. The second holding portion 463 has a second face 463a and a third face 463b. The second surface 463a is a surface facing radially inward of the inner surfaces of the second wall portions 412 f. The third surface 463b is a surface facing the other axial side of the inner surface of the second wall portion 412 f. The third surface 463b connects an end of the second surface 463a on one axial side (+y side) with the fixing surface 412 b.

The second holding surface 464 is a portion of the second surface 463a that is radially opposite to the stator core 41. The second holding surface 464 is a radial holding surface that is radially opposed to the stator core 41.

The sealing portion 495b is filled between the second holding surface 464, i.e., the radial holding surface, and the stator core 41. The sealing portion 495b contacts both the second holding surface 464 and the outer circumferential surface of the stator core 41. The sealing portion 495b is held by the second holding portion 463. The sealing portion 495b seals between the circumferential wall portion 412 and the stator core 41 at the other side (-Y side) in the axial direction than the fixing surface 412 b. The sealing portion 95a seals between the peripheral wall portion 412 and the stator core 41 on the axial side (+y side) of the fixing surface 412 b. Therefore, according to the present embodiment, the sealing portions 95a and 495b can seal between the peripheral wall portion 412 and the stator core 41 on both axial sides of the fixing surface 412b, and therefore, the stator core 41 can be firmly fixed to the case 410. Since the space between the stator core 41 and the peripheral wall 412 is sealed by the sealing portions 95a and 495b, the fluid L or the like is sealed between the stator core 41 and the peripheral wall 412. Accordingly, durability and reliability of the rotary electric machine 402 and the driving device 401 can be improved.

The peripheral wall portion 412 of the present embodiment does not have a support surface in contact with the surface of the stator core 41 facing the axial direction in the axial direction. Therefore, the first housing member 411 and the stator core 41 are positioned in the axial direction with each other by a jig used when the stator core 41 is assembled to the peripheral wall portion 412. The structure of the present embodiment and the fifth and sixth embodiments having no support surface as in the present embodiment can be suitably used in the case where the flatness and axial dimension of the axially facing surface of the stator core 41 are unstable.

< fifth embodiment >, a third embodiment

Fig. 7 is a cross-sectional view showing a part of a driving device 501 of the fifth embodiment. In the following description, the same reference numerals are given to the same components as those of the second embodiment, and the description thereof will be omitted. In the following description, the same reference numerals are given to the same components as those of the fourth embodiment, and the description thereof is omitted.

The rotary electric machine 502 of the present embodiment has a seal 595. The seal 595 includes: a seal portion 295a disposed on one axial side (+y side) of the fixing surface 512b, which is an inner peripheral surface of the fixing portion 512 a; and a seal portion 495b disposed axially opposite side (-Y side) of the fixing surface 512 b.

The peripheral wall portion 512 of the first case member 511 of the present embodiment has a holding portion 560. The peripheral wall portion 512 has a first holding portion 261 and a second holding portion 463 as the holding portion 560. The first holding portion 261, the first holding surface 262, and the sealing portion 295a of the present embodiment have the same structure as the first holding portion 261, the first holding surface 262, and the sealing portion 295a of the second embodiment. That is, the first holding portion 261 is a groove portion recessed radially outward from the inner peripheral surface of the peripheral wall portion 512 and having a first surface 261a facing radially inward. The first holding surface 262 is a portion of the first surface 261a that is opposite to the stator core 41 in the radial direction. The first holding surface 262 is a radial holding surface that is radially opposed to the stator core 41. The sealing portion 295a seals between the peripheral wall portion 512 and the stator core 41 on the axial side (+y side) than the fixing surface 512 b.

The second holding portion 463, the second holding surface 464, and the sealing portion 495b of the present embodiment have the same configuration as the second holding portion 463, the second holding surface 464, and the sealing portion 495b of the fourth embodiment described above. That is, the second holding portion 463 includes: a second face 463a facing radially inward; and a third surface 463b connecting the second surface 463a and the fixing surface 512b and facing the other side (-Y side) in the axial direction, the second holding surface 464 being a portion of the second surface 463a that is opposite to the stator core 41 in the radial direction. The second holding surface 464 is a radial holding surface that is radially opposed to the stator core 41. The sealing portion 495b seals between the peripheral wall portion 512 and the stator core 41 at the other side in the axial direction than the fixing surface 512 b. As described above, the sealing portion 295a seals between the peripheral wall portion 512 and the stator core 41 on the one axial side (+y side) than the fixing surface 512 b. Therefore, according to the present embodiment, the sealing portions 295a and 495b can seal between the peripheral wall portion 512 and the stator core 41 on both axial sides of the fixing surface 512b, and therefore, the stator core 41 can be firmly fixed to the housing 510. Since the space between the stator core 41 and the peripheral wall portion 512 is sealed by the sealing portions 295a and 495b, the fluid L or the like is sealed between the stator core 41 and the peripheral wall portion 512. Accordingly, durability and reliability of the rotary electric machine 502 and the driving device 501 can be improved.

In the present embodiment, the first holding portion may include: a second face facing radially inward; and a third surface connecting the second surface and the fixing surface 512b and facing one side in the axial direction (+y side), the first holding surface being a portion of the second surface that is opposite to the stator core 41 in the radial direction. The second holding portion may be a groove portion recessed radially outward from the inner peripheral surface of the peripheral wall portion 512 and having a first surface facing radially inward, and the second holding surface may be a portion of the first surface facing the stator core 41 in the radial direction.

< sixth embodiment >

Fig. 8 is a cross-sectional view showing a part of a driving device 601 of the sixth embodiment. In the following description, the same reference numerals are given to the same components as those of the second embodiment, and the description thereof will be omitted.

The rotary electric machine 602 of the present embodiment has a seal portion 695. The seal portion 695 includes: a seal portion 295a disposed on one axial side (+y side) of fixing surface 612b, which is the inner peripheral surface of fixing portion 612 a; and a seal portion 695b disposed on the other axial side (-Y side) of the fixed surface 612 b.

The peripheral wall portion 612 of the first housing member 611 of the present embodiment has a holding portion 660. The peripheral wall portion 612 has a first holding portion 261 and a second holding portion 663 as the holding portion 660. The first holding portion 261, the first holding surface 262, and the sealing portion 295a of the present embodiment have the same configuration as the first holding portion 261, the first holding surface 262, and the sealing portion 295a of the second embodiment, and therefore, a description thereof may be omitted. The second holding portion 663 has a second holding surface 664.

The second holding portion 663 is located axially on the other side (-Y side) of the fixing surface 212 b. The second holding portion 663 is a part of the inner side surface of the second wall portion 612 f. The second holding portion 663 is a groove portion recessed radially outward from the inner peripheral surface of the peripheral wall portion 612. The second holding portion 663 extends in the circumferential direction and is provided circumferentially throughout. 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 is radially opposite to the stator core 41. The second retaining surface 664 is a radial retaining surface that is radially opposed to the stator core 41.

The sealing portion 695b is filled between the second holding surface 664, i.e., the radial holding surface, and the stator core 41. The seal portion 695b contacts both the second holding surface 664 and the outer peripheral surface of the stator core 41. The seal portion 695b is held by the second holding portion 663. The sealing portion 695b seals between the peripheral wall portion 612 and the stator core 41 at the other side (-Y side) in the axial direction than the fixing surface 612 b. The sealing portion 295a seals between the peripheral wall portion 612 and the stator core 41 on the axial side (+y side) than the fixing surface 612 b. Therefore, according to the present embodiment, the sealing portions 295a and 695b can seal between the peripheral wall portion 612 and the stator core 41 on both axial sides of the fixing surface 612b, and therefore, the stator core 41 can be firmly fixed to the housing 610. Since the space between the stator core 41 and the peripheral wall portion 612 is sealed by the sealing portions 295a and 695b, the fluid L and the like are sealed between the stator core 41 and the peripheral wall portion 612. Accordingly, durability and reliability of the rotary electric machine 602 and the driving device 601 can be improved.

< seventh embodiment >, a third embodiment

Fig. 9 is a cross-sectional view showing a part of a driving device 701 of the seventh embodiment. In the present embodiment, the first holding portion and the sealing portion provided on one axial side (+y side) of the fixing surface 712b are not shown, but as the first holding portion and the sealing portion, any one of the first holding portion 61 and the sealing portion 95a of the first embodiment and the first holding portion 261 and the sealing portion 295a of the second embodiment may be provided. Thereby, the sealing portion held by the first holding portion seals between the peripheral wall portion 712 and the stator core 41 at the axial side (+y side) than the fixing surface 712 b.

The rotating electric machine 702 of the present embodiment has a sealing portion 795. The sealing portion 795 has: a sealing part held by the first holding part; and a sealing portion 795b disposed on the other side (-Y side) in the axial direction than the fixing surface 712b, which is the inner peripheral surface of the fixing portion 712 a.

The peripheral wall portion 712 of the first housing member 711 of the present embodiment has a holding portion 760. The peripheral wall portion 712 has the first and second holding portions 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 12h faces one axial side (+y side). The radially outer end of the support surface 712h is connected to the axially other side (-Y side) end of the fixing surface 712 b. The support surface 712h is in contact with the surface of the stator core 41 facing the other axial side. The fourth surface 712i is a surface facing radially inward. An end portion of the fourth surface 712i on one side in the axial direction is connected to an end portion of the supporting surface 712h on the inner side in the radial direction. 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 axially other end of the fourth surface 712 i. An end portion of the fifth surface 712j on the radially inner side is connected to the inner peripheral surface of the second wall portion 712 f.

The second holding portion 763 is located axially on the other side (-Y side) of the fixing surface 712 b. The second holding portion 763 is a part of the inner side surface of the second wall portion 712 f. The second holding portion 763 is formed of a fourth surface 712i and a fifth surface 712j. The second holding portion 763 extends in the circumferential direction and is provided circumferentially throughout. The second holding portion 763 is disposed radially inward of the support surface 712 h.

In the present embodiment, the second holding surface 764 is the fifth surface 712j. The second holding surface 764 is axially opposite to the surface of the stator core 41 facing the other axial side. The second holding surface 764 is an axial holding surface that is axially opposed to the stator core 41. The second holding surface 764 is disposed on the other side (-Y side) in the axial direction of the stator core 41. The second holding surface 764, i.e., the axial holding surface, is disposed at a position axially apart from the stator core 41 than the support surface 712 h.

The sealing portion 795b is filled between the second holding surface 764, i.e., 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 portion 795b is held by the second holding portion 763. The sealing portion 795b contacts both the second holding surface 764 and the surface of the stator core 41 facing the other side (-Y side) in the axial direction. The sealing portion 795b seals between the circumferential wall portion 712 and the stator core 41 at the other side in the axial direction than the fixing surface 712 b. 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 the one axial side (+y side) than the fixing surface 712 b. Therefore, according to the present embodiment, the sealing portion and the sealing portion 795b held by the first holding portion, which are not shown, can seal between the peripheral wall portion 712 and the stator core 41 on both sides in the axial direction of the fixing surface 712b, and 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 is sealed by the sealing portion 795b, the fluid L or the like is sealed between the stator core 41 and the peripheral wall portion 712. Accordingly, durability and reliability of the rotating electric machine 702 and the driving device 701 can be improved.

< eighth embodiment >, a third embodiment

Fig. 10 is a cross-sectional view showing a part of a driving device 801 of the eighth embodiment. In the present embodiment, the first holding portion and the sealing portion provided on the one axial side (+y side) than the fixing surface 812b, which is the inner peripheral surface of the fixing portion 812a, are not shown, but as the first holding portion and the sealing portion, any one of the first holding portion 61 and the sealing portion 95a of the first embodiment and the first holding portion 261 and the sealing portion 295a of the second embodiment may be provided. Thereby, the sealing portion held by the first holding portion seals between the peripheral wall portion 812 and the stator core 41 at the axial side (+y side) than the fixing surface 812 b.

The rotating electric machine 802 of the present embodiment has a sealing portion 895. The sealing portion 895 has: a sealing part held by the first holding part; and two seal portions 895b, 895c disposed on the other side (-Y side) in the axial direction than the fixed surface 812 b.

The peripheral wall portion 812 of the first housing member 811 of the present embodiment has a holding portion 860. The peripheral wall portion 812 has the first holding portion, the second holding portion 863a, and the third holding portion 863b as the holding portion 860.

The second holding portion 863a is provided on the other side (-Y side) in the axial direction than the fixing surface 812 b. The second holding portion 863a is a portion of the inner side surface of the second wall portion 812 f. The second holding portion 863a has a second holding surface 864a. The second holding portion 863a, the second holding surface 864a, and the sealing portion 895b of the present embodiment have the same configuration as the second holding portion 63, the second holding surface 64, and the sealing portion 95b of the first embodiment. That is, the second holding portion 863a is disposed radially inward of the support surface 812 h. The second holding surface 864a is an inclined surface located in a direction away from the stator core 41 in the axial direction as going radially inward. The second holding surface 864a is an axial holding surface axially opposed to the stator core 41. The seal portion 895b is filled between the second holding surface 864a, i.e., the axial holding surface, and the stator core 41. The sealing portion 895b is held by the second holding portion 863a. The seal portion 895b contacts both the second holding surface 864a and the surface of the stator core 41 facing the other axial side. The sealing portion 895b seals between the peripheral wall portion 812 and the stator core 41 at the other side in the axial direction than the fixing surface 812 b.

The third holding portion 863b is provided on the other side (-Y side) in the axial direction than the fixing surface 812 b. The third holding portion 863b is a part of the inner side surface of the second wall portion 812 f. The third holding portion 863b has a third holding surface 864b. The third holding portion 863b, the third holding surface 864b, and the sealing portion 895c of the present embodiment have the same configuration as the second holding portion 263, the second holding surface 264, and the sealing portion 295b of the second embodiment. That is, the third holding portion 863b is disposed radially outward of the support surface 812 h. The third holding portion 863b is a groove recessed from the other side of the support portion 812g facing the axial direction toward one side (+y side) in the axial direction. The third holding surface 864b is an axial holding surface that axially opposes the stator core 41. The seal portion 895c is filled between the third holding surface 864b, i.e., 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 axial side. The sealing portion 895c is held by the third holding portion 863b. The sealing portion 895c seals between the peripheral wall portion 812 and the stator core 41 at the other side in the axial direction than the fixing surface 812 b.

As described above, the sealing portion 895b seals between the peripheral wall portion 812 and the stator core 41 at the other side in the axial direction than the fixing surface 812 b. Therefore, according to the present embodiment, the peripheral wall portion 812 has a plurality of holding portions 863a, 863b on at least one side in the axial direction from the fixing surface 812b, and in the present embodiment, the peripheral wall portion 812 and the stator core 41 are sealed by the sealing portions 895b, 895c held by the respective holding portions 863a, 863b. Therefore, the sealing performance between the peripheral wall portion 812 and the stator core 41 can be improved at the other side in the axial direction than the fixing surface 812 b.

In the present embodiment, the peripheral wall portion 812 has two holding portions 863a and 863b on the other side in the axial direction from the fixed surface 812b, but the peripheral wall portion 812 may have three or more holding portions on the other side in the axial direction from the fixed surface 812 b. The peripheral wall portion 812 may have a plurality of holding portions only on one side in the axial direction of the fixing surface 812b, or may have a plurality of holding portions on both sides in the axial direction of the fixing surface 812 b.

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 the stator has a holding surface facing the stator, the sealing portion is filled between the stator and the holding surface, and the sealing portion can seal between the peripheral wall portion and the stator core, the shape and structure of the holding portion are not limited to the present embodiment, and various structures can be adopted.

The combination of the first holding portion and the second holding portion may be the following combination within a range that can be manufactured. For example, the first holding portion 61 of the first embodiment may be combined with one of the second holding portion 263 of the second embodiment and the second holding portion 363 of the third embodiment. The first holding portion 261 of the second embodiment may be combined with the second holding portion 63 of the first embodiment.

The structure of the flow path is not limited to this embodiment and other structures may be employed if the stator can be cooled. For example, the flow path may be constituted by a plurality of first flow paths extending in the axial direction and a plurality of second flow paths connecting first flow paths adjacent to each other in the circumferential direction.

While the embodiments and the modifications thereof have been described above, the respective structures and combinations thereof in the embodiments are examples, and the structures may be added, omitted, replaced, and other modified without departing from the scope of the present invention. The present invention is not limited to the embodiments.

In addition, the present technology can employ the following structure.

(1) A rotating electrical machine is provided with: a rotor rotatable about a central axis; a stator disposed radially outward of the rotor; and a housing that houses the rotor and the stator therein. The stator has a stator core surrounding the rotor from a radially outer side. The housing has a peripheral wall portion surrounding the stator from a radially outer side. The peripheral wall portion has: a fixing surface that is in contact with an outer peripheral surface of the stator core and extends in a circumferential direction; a holding portion that is located at least one side in an axial direction from the fixing surface and extends in a circumferential direction; and a flow path located radially outward of the fixed surface. Sealing portions are provided on both sides of the fixing surface in the axial direction, the sealing portions extending in the circumferential direction and sealing between the peripheral wall portion and the stator core. At least one of the seal portions is held by the holding portion.

(2) In the rotating electrical machine according to (1), the holding portion has a radial holding surface that is radially opposed to the stator core, and the sealing portion is filled between the radial holding surface and the stator core.

(3) In the rotating electrical machine according to (2), the peripheral wall portion includes a first holding portion and a second holding portion as the holding portions, the first holding portion being located on one side in the axial direction from the fixing surface, and the second holding portion being located on the other side in the axial direction from the fixing surface.

(4) The rotating electrical machine according to (2) or (3), wherein the holding portion is a groove portion recessed radially outward from an inner peripheral surface of the peripheral wall portion and having a first surface facing radially inward, the holding portion extending in a circumferential direction, and the radial holding surface is a portion of the first surface that is opposed to the stator core in a radial direction.

(5) The rotating electrical machine according to (2) or (3), wherein the holding portion includes: a second face facing radially inward; and a third face connecting the second face and the fixing face and facing in the axial direction, the radial holding face being a portion of the second face that is radially opposite to the stator core.

(6) In the rotating electrical machine according to (3), the first holding portion is a groove portion recessed radially outward from an inner peripheral surface of the peripheral wall portion and having a first surface facing radially inward, the radial holding surface of the first holding portion is a portion of the first surface that is radially opposed to the stator core, and the second holding portion has: a second face facing radially inward; and a third surface connecting the second surface and the fixing surface and facing in an axial direction, the radial holding surface of the second holding portion being a portion of the second surface that is opposite to the stator core in a radial direction.

(7) In the rotating electrical machine according to (1), the peripheral wall portion has a support surface that contacts an axially facing surface of the stator core portion radially inward of an outer peripheral surface of the stator core portion.

(8) In the rotating electrical machine according to (7), the holding portion has an axial holding surface that is axially opposed to the stator core, and the sealing portion is filled between the axial holding surface and the stator core.

(9) The rotating electrical machine according to (8), wherein the holding portion is disposed radially inward of the support surface.

(10) In the rotating electrical machine according to (9), the axial holding surface is an inclined surface that is located in a direction away from the stator core in the axial direction as going radially inward.

(11) In the rotating electrical machine according to (9), the axial holding surface is disposed at a position axially apart from the stator core portion than the support surface, and is opposed to an axially facing surface of the stator core portion.

(12) The rotating electrical machine according to (7) or (8), wherein the holding portion is disposed radially outward of the support surface.

(13) In the rotating electrical machine according to (12), the holding portion is a groove extending in a circumferential direction.

(14) In the rotating electrical machine according to (13), the holding portion has an arc shape when viewed in the circumferential direction.

(15) The rotating electrical machine according to (1), wherein the peripheral wall portion has a plurality of the holding portions on at least one side in an axial direction from the fixing surface.

(16) In the rotating electrical machine according to (1), 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, the first holding portion includes a radial holding surface facing the stator core in a radial direction, the seal portion is interposed between the radial holding surface and the stator core, the second holding portion includes an axial holding surface facing the stator core in an axial direction, and the seal portion is interposed between the axial holding surface and the stator core.

(17) In the rotating electrical machine according to (16), the peripheral wall portion has a support surface that contacts an axially facing surface of the stator core portion radially inward of an outer peripheral surface of the stator core portion, the support surface being disposed axially on the other side of the fixed surface, and the first holding portion is larger in size than the second holding portion in the axial direction.

(18) The rotating electrical machine according to any one of (1) to (17), comprising: an inverter that supplies electric power to the stator; and a connection member that electrically connects the inverter and the stator, wherein the connection member is disposed on one side in an axial direction with respect to the fixed surface, and the peripheral wall portion includes, as the holding portion, a first holding portion that is located on one side in the axial direction with respect to the fixed surface, and a second holding portion that is located on the other side in the axial direction with respect to the fixed surface, and wherein a volume of the sealing portion held by the first holding portion is larger than a volume of the sealing portion held by the second holding portion.

(19) In the rotating electrical machine of any one of (1) to (18), the stator core is thermally fixed to the fixing surface.

(20) In the rotating electrical machine of any one of (1) to (19), the casing is impregnated with a resin.

(21) A driving device is provided with: the rotating electrical machine according to any one of (1) to (20); and a transmission mechanism connected to the rotating electric machine.

Claims

1. An electric rotating machine, comprising:

a rotor rotatable about a central axis;

a stator disposed radially outward of the rotor; and

a housing that houses the rotor and the stator inside,

the stator has a stator core surrounding the rotor from a radially outer side,

the housing has a peripheral wall portion surrounding the stator from a radially outer side,

the peripheral wall portion has:

a fixing surface that is in contact with an outer peripheral surface of the stator core and extends in a circumferential direction;

a holding portion that is located at least one side in an axial direction from the fixing surface and extends in a circumferential direction; and

a flow path located radially outward of the fixed surface,

sealing portions which extend in the circumferential direction and seal between the peripheral wall portion and the stator core are provided on both sides of the fixing surface in the axial direction,

At least one of the seal portions is held by the holding portion.

2. The rotating electrical machine according to claim 1, wherein,

the holding portion has a radial holding surface facing the stator core in a radial direction,

the seal is filled between the radial holding surface and the stator core.

3. The rotating electrical machine according to claim 2, wherein,

as the holding portion, the peripheral wall portion has:

a first holding portion located on one axial side of the fixing surface; and

and a second holding portion located on the other side in the axial direction from the fixing surface.

4. A rotary electric machine according to claim 2 or 3, wherein,

the holding portion is a groove portion recessed radially outward from an inner peripheral surface of the peripheral wall portion and having a first surface facing radially inward,

the holding portion extends in the circumferential direction,

the radial holding surface is a portion of the first surface that is radially opposite to the stator core.

5. A rotary electric machine according to claim 2 or 3, wherein,

the holding portion has: a second face facing radially inward; and a third surface connecting the second surface and the fixing surface and facing in the axial direction,

The radial holding surface is a portion of the second surface that is radially opposite to the stator core.

6. A rotary electric machine according to claim 3, wherein,

the first holding portion is a groove portion recessed radially outward from an inner peripheral surface of the peripheral wall portion and having a first surface facing radially inward,

the radial holding surface of the first holding portion is a portion of the first surface that is radially opposite to the stator core,

the second holding portion has: a second face facing radially inward; and a third surface connecting the second surface and the fixing surface and facing in the axial direction,

the radial holding surface of the second holding portion is a portion of the second surface that is radially opposite to the stator core.

7. The rotating electrical machine according to claim 1, wherein,

the peripheral wall portion has a support surface that contacts an axially facing surface of the stator core radially inward of an outer peripheral surface of the stator core.

8. The rotating electrical machine according to claim 7, wherein,

the holding portion has an axial holding surface axially opposed to the stator core,

The seal portion is filled between the axial retention surface and the stator core.

9. The rotating electrical machine according to claim 8, wherein,

the holding portion is disposed radially inward of the support surface.

10. The rotating electrical machine according to claim 9, wherein,

the axial holding surface is an inclined surface located in a direction away from the stator core in an axial direction as going radially inward.

11. The rotating electrical machine according to claim 9, wherein,

the axial holding surface is disposed at a position axially apart from the stator core portion than the support surface, and faces an axially facing surface of the stator core portion.

12. The rotating electrical machine according to claim 8, wherein,

the holding portion is disposed radially outward of the support surface.

13. The rotating electrical machine according to claim 12, wherein,

the holding portion is a groove extending in the circumferential direction.

14. The rotating electrical machine according to claim 13, wherein,

the holding portion is arcuate when viewed in the circumferential direction.

15. The rotating electrical machine according to claim 1, wherein,

the peripheral wall portion has a plurality of the holding portions at least one side in an axial direction from the fixing surface.

16. The rotating electrical machine according to claim 1, wherein,

as the holding portion, the peripheral wall portion has:

a first holding portion located on one axial side of the fixing surface; and

a second holding portion located on the other side in the axial direction from the fixing surface,

the first holding portion has a radial holding surface radially opposed to the stator core,

the seal portion is filled between the radial holding surface and the stator core,

the second holding portion has an axial holding surface axially opposed to the stator core,

17. The rotating electrical machine according to claim 16, wherein,

the peripheral wall portion has a support surface contacting an axially facing surface of the stator core portion radially inward of an outer peripheral surface of the stator core portion,

the bearing surface is arranged at the other side of the axial direction of the fixed surface,

in the axial direction, the first holding portion is larger in size than the second holding portion.

18. The rotating electrical machine according to claim 1, wherein,

The device is provided with: an inverter that supplies electric power to the stator; and a connection member electrically connecting the inverter and the stator,

the connecting member is disposed at one side of the fixing surface in the axial direction,

as the holding portion, the peripheral wall portion has:

a first holding portion located on one axial side of the fixing surface; and

the sealing portion held by the first holding portion has a larger volume than the sealing portion held by the second holding portion.

19. The rotating electrical machine according to claim 1, wherein,

the stator core is thermally fixed to the fixing surface.

20. The rotating electrical machine according to claim 1, wherein,

the outer shell is impregnated with resin.

21. A driving device is characterized by comprising:

the rotary electric machine of claim 1; and

and the transmission mechanism is connected with the rotating motor.