Rotating electrical machine and drive device

Abstract

According to one embodiment of the present invention, a rotating electrical machine is provided with: a rotor; a stator; a housing having a first housing part in which the rotor and the stator are housed; and a pipe member that is hollow, extends in the axial direction, and is housed inside the first housing part. The stator core has a stator core main body and at least one fixing portion protruding radially outward from an outer peripheral surface of the stator core main body. At least one of the fixing parts includes an upper fixing part located at a position closer to the upper side in the vertical direction than the central axis. The upper fixing portion is located on one side of the pipe member in the circumferential direction. The pipe member has a first opening portion that opens inside the first housing portion, and is positioned on the upper side of the stator core body in the vertical direction. When viewed in the vertical direction, at least a portion of the pipe member overlaps with a tooth located closest to the upper side in the vertical direction among the plurality of teeth. The inner surface of the first accommodating part is provided with an opposite part which is opposite to the radial outer side of the upper side fixing part through a gap. The first opening portion opens toward the facing portion.

Description

Technical Field

[0001] The present invention relates to a rotating electrical machine and a driving device.

[0002] This application claims priority based on Japanese Patent Application No. 2022-096764 filed in Japan on June 15, 2022, the contents of which are cited here. Background Art

[0003] There is known a rotating electric machine having a structure for supplying a refrigerant to a stator. For example, Patent Document 1 describes a rotating electric machine having a structure for injecting cooling oil as a refrigerant to a stator core.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2012-115001 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In the rotating electric machine of Patent Document 1, the refrigerant is injected from the injection hole that opens toward the fixing portion in the stator for fixing the stator body to the housing. Therefore, when the injected refrigerant contacts the fixing portion, the momentum of the refrigerant decreases, and the refrigerant may have difficulty passing over the fixing portion. Therefore, the stator may not be properly cooled by the refrigerant.

[0009] The present invention has been made in view of the above circumstances, and one object of the present invention is to provide a rotating electrical machine and a drive device having a structure capable of improving the cooling efficiency of a stator.

[0010] Means for solving problems

[0011] One embodiment of the present invention is a rotating electric machine, which includes: a rotor that can rotate around a central axis extending in a direction intersecting the vertical direction; a stator that includes a stator core located radially outside the rotor; a housing that includes a first housing portion that houses the rotor and the stator; and a pipe member that is hollow, extends in the axial direction, and is housed inside the first housing portion. The stator core includes: a stator core body that includes a cylindrical core back surrounding the rotor and a plurality of teeth that protrude radially inward from the core back; and at least one fixing portion that protrudes radially outward from the outer peripheral surface of the stator core body. The at least one fixing portion includes an upper fixing portion that is located vertically above the central axis. The upper fixing portion is located on one circumferential side of the pipe member. The pipe member includes a first opening that opens inside the first housing portion, and the pipe member is located vertically above the stator core body. When viewed in the vertical direction, at least a portion of the tube member overlaps with a tooth located most upward in the vertical direction among the plurality of teeth. The inner surface of the first housing portion includes an opposing portion that is opposed to the radially outer side of the upper fixing portion with a gap therebetween. The first opening portion opens toward the opposing portion.

[0012] One aspect of the present invention is a drive device including the above-mentioned rotating electric machine and a gear mechanism connected to the rotating electric machine.

[0013] Effects of the Invention

[0014] According to one aspect of the present invention, in a rotating electrical machine and a drive device, it is possible to improve the cooling efficiency of a stator. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic configuration diagram schematically showing the driving device in the first embodiment.

[0016] Figure 2 is a cross-sectional view showing a portion of the rotating electrical machine in the first embodiment. Figure 1 Sectional view II-II in FIG.

[0017] Figure 3 It is a perspective view showing the stator core and the pipe member in the first embodiment.

[0018] Figure 4 This is a diagram of the stator core and the pipe member in the first embodiment as viewed from above in the vertical direction.

[0019] Figure 5 is a cross-sectional view showing a portion of the rotating electrical machine in the first embodiment. Figure 1 VV section view in.

[0020] Figure 6 It is a partially cutaway perspective view showing a part of the motor housing and a part of the pipe member in the first embodiment.

[0021] Figure 7 It is a cross-sectional view showing a part of the rotating electrical machine in the second embodiment.

[0022] Figure 8 It is a cross-sectional view showing a part of the rotating electrical machine in the third embodiment. DETAILED DESCRIPTION

[0023] In the following description, the vertical direction is defined and described based on the positional relationship when the drive device of the embodiment is mounted on a vehicle located on a horizontal road surface. That is, the relative positional relationship related to the vertical direction described in the following embodiments only needs to be satisfied at least when the drive device is mounted on a vehicle located on a horizontal road surface.

[0024] In the accompanying 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 +Z side is the upper side in the vertical direction, and the -Z side is the lower side in the vertical direction. In the following description, the upper side in the vertical direction is referred to as the "upper side", and the lower side in the vertical direction is referred to as the "lower side". The X-axis direction is a direction perpendicular to the Z-axis direction, and is the front-to-back direction of a vehicle equipped with a drive device. In the following embodiments, the +X side is the front side of the vehicle, and the -X side is the rear side of the vehicle. The Y-axis direction is a direction perpendicular to both the X-axis direction and the Z-axis direction, and is the left-to-right direction of the vehicle, that is, the vehicle width direction. In the following embodiments, the +Y side is the left side of the vehicle, and the -Y side is the right side of the vehicle. The front-to-back direction and the left-to-right direction are horizontal directions perpendicular to the vertical direction.

[0025] In addition, the positional relationship in the front-rear direction is not limited to the positional relationship in the following embodiments, and the +X side may be the rear side of the vehicle and the -X side may be the front side of the vehicle. In this case, the +Y side is the right side of the vehicle and the -Y side is the left side of the vehicle. In addition, in this specification, "parallel direction" also includes a substantially parallel direction, and "vertical direction" also includes a substantially vertical direction.

[0026] The center axis J shown in the figure appropriately is an imaginary axis extending in a direction intersecting the vertical direction. In more detail, the center axis J extends in the Y-axis direction perpendicular to the vertical direction, that is, the left-right direction of the vehicle. In the following description, unless otherwise specified, the direction parallel to the center axis J is referred to as the "axial direction", the radial direction centered on the center axis J is referred to as the "radial direction", and the circumferential direction centered on the center axis J, that is, the direction around the center axis J is referred to as the "circumferential direction". In the following description, the right side is one side of the axial direction, and the left side is the other side of the axial direction.

[0027] The arrow θ shown in the figure appropriately indicates the circumferential direction. In the following description, the side that moves clockwise around the central axis J when viewed from the right side in the circumferential direction, that is, the side to which the arrow θ points (+θ side) is referred to as "one side in the circumferential direction", and the side that moves counterclockwise around the central axis J when viewed from the right side in the circumferential direction, that is, the side opposite to the side to which the arrow θ points (-θ side) is referred to as "the other side in the circumferential direction".

[0028] <First embodiment>

[0029] Figure 1 The drive device 100 of the present embodiment shown is a drive device mounted on a vehicle and rotates the axle 64. The vehicle equipped with the drive device 100 is a vehicle using a motor as a power source, such as a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHV), or an electric vehicle (EV). Figure 1 As shown, the drive device 100 includes a rotating electric machine 10 and a gear mechanism 60. The gear mechanism 60 is connected to the rotating electric machine 10, and transmits the rotation of the rotating electric machine 10, that is, the rotation of the rotor 30 described later, to the axle 64 of the vehicle. The gear mechanism 60 of this embodiment includes a gear housing 61, a reduction gear 62 connected to the rotating electric machine 10, and a differential device 63 connected to the reduction gear 62.

[0030] The gear housing 61 accommodates the reduction gear 62, the differential gear 63, and the oil O therein. The oil O is stored in the lower area of ​​the gear housing 61. The oil O circulates in the refrigerant flow path 90 described later. The oil O is used as a refrigerant for cooling the rotary electric machine 10. In addition, the oil O is used as a lubricating oil for the reduction gear 62 and the differential gear 63. As the oil O, for example, in order to function as a refrigerant and a lubricating oil, it is preferable to use an oil equivalent to an automatic transmission lubricating oil (ATF: Automatic Transmission Fluid) with a relatively low viscosity.

[0031] The differential device 63 has a ring gear 63a. The torque output from the rotary electric machine 10 is transmitted to the ring gear 63a via the reduction gear 62. The lower end of the ring gear 63a is immersed in the oil O stored in the gear housing 61. The oil O is lifted up by the rotation of the ring gear 63a. The lifted oil O is provided to the reduction gear 62 and the differential device 63 as lubricating oil, for example.

[0032] The rotating electric machine 10 is a part that drives the driving device 100. The rotating electric machine 10 is, for example, located on the right side of the gear mechanism 60. In the present embodiment, the rotating electric machine 10 is a motor. The rotating electric machine 10 includes a motor housing 20, a rotor 30 that can rotate about a central axis J, a stator 40, a pipe member 50, and an inverter device 80. Figure 2 As shown, the rotary electric machine 10 has a bus bar assembly 86 .

[0033] The motor housing 20 is a housing having a first housing portion 20a for housing the rotor 30 and the stator 40 therein and a second housing portion 20b for housing the inverter device 80 therein. Figure 1 As shown, the first housing portion 20a in the motor housing 20 is connected to the right side of the gear housing 61. The first housing portion 20a has a peripheral wall portion 21, a partition wall portion 22, and a cover portion 23. The peripheral wall portion 21 and the partition wall portion 22 are, for example, parts of the same single component. The cover portion 23 is, for example, separate from the peripheral wall portion 21 and the partition wall portion 22.

[0034] The peripheral wall portion 21 is in the shape of a tube that surrounds the central axis J and opens on the right side. The partition wall portion 22 is connected to the left end of the peripheral wall portion 21. The partition wall portion 22 separates the interior of the first housing portion 20a from the interior of the gear housing 61 in the axial direction. The partition wall portion 22 has a partition wall opening 22a that connects the interior of the first housing portion 20a and the interior of the gear housing 61. The bearing 34 is retained in the partition wall portion 22. The cover portion 23 is fixed to the right end of the peripheral wall portion 21. The cover portion 23 closes the opening on the right side of the peripheral wall portion 21. The bearing 35 is retained in the cover portion 23.

[0035] like Figure 2 As shown, the inner surface of the first storage portion 20a has a recess 21c that is recessed radially outward. In the present embodiment, the recess 21c is provided in the portion located on the upper side of the inner circumferential surface of the peripheral wall portion 21, and the recess 21c is recessed upward. The inner surface of the recess 21c is a part of the inner surface of the first storage portion 20a. When viewed axially, the internal shape of the recess 21c is a roughly trapezoidal shape whose circumferential dimension decreases as it moves radially outward. Although the illustration is omitted, the recess 21c extends axially. The recess 21c opens on the right side (-Y side). The portion of the peripheral wall portion 21 of the first storage portion 20a where the recess 21c is provided becomes a protrusion 21d that protrudes radially outward. The protrusion 21d protrudes into the second storage portion 20b.

[0036] The first storage portion 20a has a core support portion 21a. The core support portion 21a is arranged on the inner circumferential surface of the peripheral wall portion 21. The core support portion 21a protrudes radially inward. The radially inner surface of the core support portion 21a is an arc-shaped curved surface centered on the central axis J. The radially inner surface of the core support portion 21a contacts the outer circumferential surface 43c of the stator core body 43 of the stator 40 described later. Thus, the core support portion 21a supports the stator 40 from the radially outer side. Although omitted from the illustration, the core support portion 21a extends in the axial direction. A plurality of core support portions 21a are arranged at intervals along the circumferential direction. The core support portions 21a are respectively arranged on one circumferential side of the recess 21c and on the other circumferential side of the recess 21c.

[0037] The core support portion 21a has a through groove 21b that penetrates the core support portion 21a in the circumferential direction. The through groove 21b is recessed from the radial inner side of the core support portion 21a to the radial outer side. Although not shown in the figure, in the present embodiment, a plurality of through grooves 21b are provided at intervals in the axial direction for each core support portion 21a.

[0038] The second storage portion 20b is connected to the upper side of the first storage portion 20a. Figure 1 As shown in FIG. 1 , the second storage portion 20b is provided across the upper side of the gear housing 61 and the upper side of the first storage portion 20a. The second storage portion 20b is connected to the upper side of the gear housing 61. Figure 2 As shown, the second storage section 20b is a storage section for storing a substrate 84 described later in the inverter device 80. The second storage section 20b includes a box-shaped storage body 28a opened at the top and an inverter cover 28b closing the upper opening of the storage body 28a.

[0039] The storage body 28a is connected to the upper side of the peripheral wall 21 of the first storage part 20a. The storage body 28a and the peripheral wall 21 are, for example, parts of the same single component. The storage body 28a has a bottom wall 28e constituting the lower wall of the second storage part 20b and a frame-shaped portion 28f protruding upward from the outer peripheral edge of the bottom wall 28e. A part of the bottom wall 28e is constituted by a part of the upper side of the peripheral wall 21. The part of the peripheral wall 21 constituting a part of the bottom wall 28e includes a protruding portion 21d.

[0040] The inverter cover 28b is fixed to the upper end of the frame-shaped portion 28f. The inverter cover 28b extends in a direction perpendicular to the vertical direction and covers the inverter device 80 from the upper side. The inverter device 80 is fixed to the lower surface of the inverter cover 28b. The inverter cover 28b has a first portion 28c located on the upper side of the first storage portion 20a and a second portion 28d connected to the rear side (-X side) of the first portion 28c. The second portion 28d is located at a position higher than the first portion 28c. The distance in the vertical direction between the second portion 28d and the bottom wall portion 28e is greater than the distance in the vertical direction between the first portion 28c and the bottom wall portion 28e.

[0041] The motor housing 20 has a partition wall portion 24 that protrudes radially outward from the peripheral wall portion 21. The partition wall portion 24 protrudes upward from the upper portion of the right side (-Y side) end portion of the peripheral wall portion 21. The partition wall portion 24 protrudes radially outward from the protruding portion 21d. The partition wall portion 24 constitutes a part of the right side wall portion of the frame-shaped portion 28f of the second storage portion 20b. The partition wall portion 24 is a wall portion that separates the interior of the first storage portion 20a from the interior of the second storage portion 20b.

[0042] The partition wall portion 24 has a connection hole 24a that penetrates the partition wall portion 24 in the axial direction. That is, the motor housing 20 has the connection hole 24a. The connection hole 24a is a hole that connects the inside of the first housing portion 20a and the inside of the second housing portion 20b. The right end (-Y side) of the connection hole 24a opens inside the first housing portion 20a. The left end (+Y side) of the connection hole 24a opens inside the second housing portion 20b.

[0043] like Figure 1 As shown, the rotor 30 includes a shaft 31 and a rotor body 32. Although not shown in the figure, the rotor body 32 includes a rotor core and a rotor magnet fixed to the rotor core. The torque of the rotor 30 is transmitted to the gear mechanism 60.

[0044] The shaft 31 is rotatable about the center axis J. The shaft 31 is rotatably supported by bearings 34 and 35. In the present embodiment, the shaft 31 is a hollow shaft. The shaft 31 is cylindrical and extends axially about the center axis J. A hole portion 33 is provided on the shaft 31 to connect the inside of the shaft 31 and the outside of the shaft 31. The shaft 31 extends across the inside of the motor housing 20 and the inside of the gear housing 61. The left end of the shaft 31 protrudes into the inside of the gear housing 61. A reduction device 62 is connected to the left end of the shaft 31.

[0045] The stator 40 and the rotor 30 are opposed to each other with a gap therebetween in the radial direction. More specifically, the stator 40 is located radially outside the rotor 30. The stator 40 is fixed inside the motor housing 20. The stator 40 has a stator core 41 and a coil assembly 42. The stator core 41 is in a ring shape surrounding the central axis J of the rotating electrical machine 10. The stator core 41 is located radially outside the rotor 30. The stator core 41 surrounds the rotor 30. The stator core 41 is formed by stacking a plurality of plate members such as electromagnetic steel plates in the axial direction, for example.

[0046] like Figure 3 and Figure 4 As shown, the stator core 41 has a stator core body 43 and at least one fixing portion 44. The stator core body 43 is in a ring shape surrounding the rotor 30. In more detail, the stator core body 43 is in a cylindrical shape centered on the central axis J and open on both axial sides. The stator core body 43 has a cylindrical outer peripheral surface 43c surrounding the rotor 30. In the present embodiment, the outer peripheral surface 43c is in a cylindrical shape centered on the central axis J. The outer peripheral surface 43c constitutes a part of the outer peripheral surface of the stator core 41. In the present embodiment, the outer peripheral surface of the stator core 41 is composed of the outer peripheral surface 43c and the radial outer side surface of the fixing portion 44. As shown in FIG. Figure 2As shown, the outer peripheral surface 43c is supported from the radially outer side by the core support portion 21a provided on the inner peripheral surface of the motor housing 20. The outer peripheral surface 43c and the portion of the inner peripheral surface of the motor housing 20 where the core support portion 21a is not provided are arranged opposite to each other in the radial direction with a gap therebetween. The outer peripheral surface 43c and the inner surface of the recessed portion 21c are arranged opposite to each other in the radial direction with a gap therebetween.

[0047] like Figure 1 and Figure 3 As shown in FIG. 1 , the stator core body 43 has a cylindrical core back 43a surrounding the rotor 30 and a plurality of teeth 43b protruding radially inward from the core back 43a. The core back 43a is cylindrical and extends axially with the central axis J as the center. The outer peripheral surface of the core back 43a is the outer peripheral surface 43c of the stator core body 43. The plurality of teeth 43b are arranged at equal intervals along the circumferential direction over the entire circumference. Figure 5 As shown, the stator core body 43 has a top 43t located at the uppermost position in the vertical direction of the outer peripheral surface 43c of the stator core body 43. The top 43t is a portion of the upper portion of the outer peripheral surface 43c that intersects with an imaginary line L1 that passes through the center axis J and extends in the vertical direction when viewed in the axial direction.

[0048] The fixing portion 44 protrudes radially outward from the outer peripheral surface 43c of the stator core body 43. The fixing portion 44 is a portion fixed to the first housing portion 20a. Figure 3 As shown, the fixing portion 44 extends in the axial direction. The fixing portion 44 extends, for example, from the end portion on the right side of the stator core body 43 to the end portion on the left side of the stator core body 43. When viewed in the axial direction, the circumferential dimension of the fixing portion 44 decreases as it moves radially outward. The outer shape of the radially outer end portion of the fixing portion 44 is an arc-shaped protruding radially outward when viewed in the axial direction. The fixing portion 44 is a symmetrical shape in the circumferential direction. The ends on both sides of the circumferential direction of the fixing portion 44 are smoothly connected to the outer peripheral surface 43c. In this embodiment, a plurality of fixing portions 44 are arranged at intervals in the circumferential direction. For example, four fixing portions 44 are arranged.

[0049] Each fixing portion 44 has a bolt hole 44b extending in the axial direction. In the present embodiment, the bolt hole 44b is a through hole that penetrates each fixing portion 44 in the axial direction. The bolt hole 44b is, for example, a circular hole. Figure 5 As shown, a bolt 45 extending in the axial direction is passed through the bolt hole 44b. The bolt 45 is passed through the bolt hole 44b from the right side (-Y side), for example, and is screwed into the internal threaded hole provided in the first housing portion 20a. Thus, the fixing portion 44 is fixed to the first housing portion 20a by the bolt 45. In addition, the bolt hole 44b may also be a hole having a bottom at the axial end.

[0050] like Figure 3As shown, one of the fixing portions 44 protrudes upward from the stator core body 43. Another of the fixing portions 44 protrudes downward from the stator core body 43. Still another of the fixing portions 44 protrudes forward (+X side) from the stator core body 43. The remaining one of the fixing portions 44 protrudes backward (-X side) from the stator core body 43.

[0051] In this embodiment, the fixing portion 44 protruding upward among the four fixing portions 44 is the upper fixing portion 44a located vertically above the center axis J. That is, at least one fixing portion 44 includes the upper fixing portion 44a. The upper fixing portion 44a is the fixing portion 44 located at the uppermost position among the four fixing portions 44. Figure 5 As shown, the upper fixing portion 44a is located at a position closer to one side (+θ side) in the circumferential direction than the top portion 43t. The upper fixing portion 44a protrudes from the stator core body 43 in a direction slightly inclined toward one side in the circumferential direction relative to directly above the vertical direction. In the present embodiment, the upper fixing portion 44a protrudes from the stator core body 43 in a direction slightly inclined toward the front side (+X side) relative to directly above the vertical direction. At least a portion of the upper fixing portion 44a is located inside the recess 21c. In the present embodiment, the entire upper fixing portion 44a is located inside the recess 21c. The upper fixing portion 44a is located at a portion on one side in the circumferential direction, that is, a portion on the front side, inside the recess 21c.

[0052] The portion of the inner surface of the recessed portion 21c that is opposed to the radially outer side of the upper fixing portion 44a with a gap therebetween is the opposing portion 25. That is, the inner surface of the first housing portion 20a has an opposing portion 25 that is opposed to the radially outer side of the upper fixing portion 44a with a gap therebetween. The opposing portion 25 has: a first portion 25a that is located on one circumferential side (+θ side) relative to the circumferential center of the upper fixing portion 44a; and a second portion 25b that is located on the other circumferential side (-θ side) relative to the circumferential center of the upper fixing portion 44a. Figure 5 , the center of the circumferential direction of the upper fixing portion 44a is indicated by an imaginary line L2. The imaginary line L2 is an imaginary line that passes through the central axis J and the center of the circumferential direction of the upper fixing portion 44a when viewed in the axial direction and extends in the radial direction. The imaginary line L2 passes through the center CP2 of the bolt hole 44b of the upper fixing portion 44a when viewed in the axial direction. The upper fixing portion 44a has a shape that is line-symmetrical about the imaginary line L2 as an axis when viewed in the axial direction.

[0053] When viewed in the axial direction, the first portion 25a extends along the radially outer side of the portion of the upper fixing portion 44a located closer to one side (+θ side) in the circumferential direction than the imaginary line L2. The first portion 25a is located radially inward as it approaches one side in the circumferential direction. The gap between the first portion 25a and the upper fixing portion 44a is, for example, substantially uniform in the entire circumferential direction. When viewed in the axial direction, the second portion 25b extends in the circumferential direction. The gap between the second portion 25b and the upper fixing portion 44a increases, for example, as it approaches the other side (-θ side) in the circumferential direction.

[0054] like Figure 1 As shown, the coil assembly 42 has a plurality of coils 42c installed on the stator core 41 along the circumferential direction. The plurality of coils 42c are respectively installed on the teeth 43b of the stator core 41 via insulating members not shown. The plurality of coils 42c are arranged along the circumferential direction. In more detail, the plurality of coils 42c are arranged at equal intervals throughout the circumference along the circumferential direction. Although not shown in the figure, the coil assembly 42 may have a bundling member for bundling the coils 42c, or may have a lap wire connecting the coils 42c to each other.

[0055] The coil assembly 42 has coil ends 42a and 42b that protrude axially from the stator core 41. That is, the stator 40 has coil ends 42a and 42b that protrude axially from the stator core 41. The coil end 42a is a portion that protrudes to the left side than the stator core 41. The coil end 42b is a portion that protrudes to the right side than the stator core 41. The coil end 42a includes a portion that protrudes to the left side than the stator core 41 in each coil 42c included in the coil assembly 42. The coil end 42b includes a portion that protrudes to the right side than the stator core 41 in each coil 42c included in the coil assembly 42. In the present embodiment, the coil ends 42a and 42b are annular in shape with the central axis J as the center. Although not shown in the figure, the coil ends 42a and 42b may include a bundling component for bundling the coils 42c, or may include a lap wire that connects the coils 42c to each other.

[0056] The inverter device 80 is stored in the second storage portion 20b. Figure 2 As shown, the inverter device 80 includes a power element 82, a capacitor 83, a substrate 84, and an electronic component 85. That is, the rotating electrical machine 10 includes the power element 82, the capacitor 83, the substrate 84, and the electronic component 85.

[0057] The power element 82 has, for example, an insulated gate bipolar transistor (IGBT: Insulated Gate Bipolar

[0058] The plurality of transistors constitute an inverter circuit electrically connected to the stator 40.

[0059] In the present embodiment, the power element 82 is located inside the portion of the front side (+X side) of the second storage portion 20b. The power element 82 is located on the upper side of the stator core 41. At least a portion of the power element 82 overlaps with the stator core 41 when viewed in the vertical direction. In the present embodiment, the power element 82 as a whole overlaps with the stator core 41 when viewed in the vertical direction. The power element 82 is fixed to the lower surface of the inverter cover 28b. In more detail, the power element 82 is fixed to the lower surface of the first portion 28c in the inverter cover 28b.

[0060] The capacitor 83 is, for example, an electrolytic capacitor or a film capacitor. In the present embodiment, the capacitor 83 is located inside the portion of the rear side (-X side) of the second storage portion 20b. The capacitor 83 is located on the rear side of the power element 82. The vertical dimension of the capacitor 83 is larger than the vertical dimension of the power element 82. The capacitor 83 is electrically connected to the power element 82. The capacitor 83 is fixed to the lower surface of the inverter cover portion 28b. In more detail, the capacitor 83 is fixed to the lower surface of the second portion 28d in the inverter cover portion 28b.

[0061] The substrate 84 is in the shape of a plate extending in a direction perpendicular to the vertical direction. The plate surface of the substrate 84 faces the vertical direction. The substrate 84 is located below the power element 82 and the capacitor 83. The substrate 84 is fixed to a plurality of substrate mounting portions 82a provided on the surface below the power element 82 and a plurality of substrate mounting portions 83a provided on the surface below the capacitor 83, and is mounted on the power element 82 and the capacitor 83. The substrate 84 is electrically connected to the power element 82 and the capacitor 83.

[0062] When viewed in the axial direction, the substrate 84 extends in the front-rear direction X. The substrate 84 is located at a position on the rear side (-X side) of the connection hole 24a provided in the partition wall portion 24. The substrate 84 is located at a position on the upper side than the end of the upper side of the protrusion 21d and on the lower side than the end of the upper side of the connection hole 24a. The substrate 84 is located on the upper side of the protrusion 21d and the recess 21c. In more detail, the end of the front side (+X side) of the substrate 84 is located on the upper side of the protrusion 21d and the recess 21c. The substrate 84 is electrically connected to the stator 40 via the power element 82 and the bus bar 86a of the bus bar assembly 86 described later.

[0063] The electronic component 85 is mounted on the lower surface of the substrate 84. A plurality of electronic components 85 are provided. The plurality of electronic components 85 are mounted on the lower surface of the rear side (-X side) of the substrate 84. The plurality of electronic components 85 are located at a position further back than the protrusion 21d. The lower end of the plurality of electronic components 85 is located at a position further down than the upper end of the protrusion 21d. The electronic component 85 is a component with a relatively large vertical dimension among the components mounted on the lower surface of the substrate 84.

[0064] like Figure 4 As shown, the bus bar assembly 86 extends in the axial direction. The bus bar assembly 86 is located on the upper side of the stator 40. The bus bar assembly 86 protrudes in the axial direction from the stator 40. The bus bar assembly 86 is inserted into the connection hole 24a provided in the partition wall portion 24 in the axial direction. The bus bar assembly 86 is arranged across the interior of the first housing portion 20a and the interior of the second housing portion 20b via the connection hole 24a.

[0065] like Figure 2 and Figure 5 As shown, when the bus bar assembly 86 is viewed in the front-back direction (X-axis direction) perpendicular to both the axial direction and the vertical direction, at least a portion overlaps with the recess 21c. Therefore, compared with the case where the entire bus bar assembly 86 is arranged on the upper side of the recess 21c, the rotating electric machine 10 can be miniaturized in the vertical direction. In addition, as described above, the substrate 84 is located on the upper side of the recess 21c. Therefore, it is easy to arrange the substrate 84 close to the bus bar assembly 86, and it is easy to connect the substrate 84 and the bus bar assembly 86 via the power element 82. In addition, by arranging the end of the front side (+X side) of the substrate 84 on the upper side of the recess 21c, it is easy to expand the vertical direction between the rear side (-X side) of the substrate 84 and the bottom wall 28e of the second storage section 20b. As a result, it is easy to mount the electronic component 85 with a relatively large size in the vertical direction on the lower side of the rear side of the substrate 84 and arrange it in the second storage section 20b.

[0066] In this embodiment, the lower end of the bus bar assembly 86 overlaps with the upper end of the recess 21c when viewed in the front-rear direction. The bus bar assembly 86 is located in front of the upper fixing portion 44a (+X side) and on the upper side (+Z side). Figure 2 As shown, the bus bar assembly 86 is located on the front side of the base plate 84. The bus bar assembly 86 has a bus bar 86a and a bus bar holder 86b. That is, the rotary electric machine 10 has the bus bar 86a and the bus bar holder 86b.

[0067] The busbar 86a is in the shape of a plate extending in the axial direction. The plate surface of the busbar 86a faces the vertical direction. A plurality of busbars 86a are provided. In the present embodiment, three busbars 86a are arranged in the vertical direction at intervals. The busbar 86a is inserted into the connection hole 24a in the axial direction. The busbar 86a is arranged across the interior of the first storage section 20a and the interior of the second storage section 20b via the connection hole 24a. The portion of the busbar 86a located inside the first storage section 20a is electrically connected to the coil 42c of the stator 40. Thus, the busbar 86a is electrically connected to the stator 40. The portion of the busbar 86a located inside the second storage section 20b is electrically connected to the power element 82. Thus, the busbar 86a electrically connects the substrate 84 to the stator 40 via the power element 82.

[0068] The bus bar holder 86b holds the bus bar 86a. In the present embodiment, a portion of the bus bar 86a is embedded in the bus bar holder 86b. The bus bar holder 86b is made of resin. The bus bar holder 86b is made, for example, by insert molding in which the bus bar 86a is an insert component. Figure 4 As shown, the bus bar holder 86b extends in the axial direction. The bus bar holder 86b is inserted into the connection hole 24a in the axial direction. The bus bar holder 86b has a base portion 86c, an inserted portion 86d, and an extended portion 86e.

[0069] The base 86c is located inside the first storage portion 20a. Although not shown in the figure, a portion of the bus bar 86a is exposed from the base 86c. The portion of the bus bar 86a exposed from the base 86c is electrically connected to the coil 42c of the stator 40. The inserted portion 86d is connected to the left side (+Y side) of the base 86c. The inserted portion 86d is inserted into the inside of the connection hole 24a. Figure 2 As shown in FIG. 1 , when viewed along the axial direction, the inserted portion 86d is substantially circular. In addition, the outer shape of the inserted portion 86d when viewed along the axial direction is not particularly limited, and may be a shape other than a circular shape. The outer shape of the inserted portion 86d when viewed along the axial direction may also be a polygonal shape such as a quadrilateral. Figure 4 As shown in FIG. 8 , the extension portion 86e is connected to the left side of the inserted portion 86d. The extension portion 86e extends from the inserted portion 86d to the left side. Figure 5 As shown, the extension portion 86e is located inside the second housing portion 20b. The extension portion 86e is roughly rectangular when viewed in the axial direction. In addition, the outer shape of the extension portion 86e when viewed in the axial direction is not particularly limited, and it can also be a shape other than a rectangle. The outer shape of the extension portion 86e when viewed in the axial direction can be, for example, a polygonal shape other than a rectangle, or a circular shape. Although the illustration is omitted, a portion of the bus bar 86a is exposed from the extension portion 86e. The portion of the bus bar 86a exposed from the extension portion 86e is electrically connected to the power element 82.

[0070] like Figure 1 As shown, the tube component 50 is in the shape of a tube extending in the axial direction. The tube component 50 is a hollow component, which is a roughly cylindrical tube opened on both sides in the axial direction. The tube component 50 is housed inside the first housing portion 20a. Both axial ends of the tube component 50 are supported by the first housing portion 20a. The left end of the tube component 50 is supported by, for example, the partition wall portion 22. The right end of the tube component 50 is supported by, for example, the cover portion 23. The tube component 50 is located radially outside the stator 40. As shown in FIG. Figure 5 As shown, the pipe member 50 is located on the upper side of the stator core body 43. The pipe member 50 is arranged adjacent to the other circumferential side (-θ side) of the upper fixing portion 44a. That is, the upper fixing portion 44a is located on one circumferential side (+θ side) of the pipe member 50. In this embodiment, the portion of the pipe member 50 on one circumferential side overlaps with the end of the other circumferential side of the upper fixing portion 44a when viewed in the vertical direction. Figure 4 As shown, the pipe member 50 protrudes in both axial directions from the stator 40 .

[0071] The pipe member 50 includes a main body 51, an arm 52, a pin 53, a flange 54, and a rib 55. The main body 51 is in the shape of a tube extending in the axial direction. The main body 51 is in the shape of a cylinder opened on both sides in the axial direction. The main body 51 protrudes in both sides in the axial direction from the stator 40. The axial center portion of the main body 51 is located on the upper side of the stator core body 43.

[0072] The left side (+Y side) end of the main body 51 is an inlet portion 51a opened on the left side. The inlet portion 51a is the left side end of the tube member 50. The inlet portion 51a is, for example, embedded in a hole (not shown) provided in the partition wall 22 and supported by the partition wall 22. The oil O flows into the inside of the tube member 50 from the inlet portion 51a.

[0073] The end portion on the right side (-Y side) of the main body 51 is an outflow portion 51b that opens on the right side. The outflow portion 51b is the end portion on the right side of the tube member 50. The outflow portion 51b is, for example, embedded in a hole (not shown) provided in the cover portion 23 and supported by the cover portion 23. A portion of the oil O that flows into the interior of the tube member 50 from the inflow portion 51a flows out from the outflow portion 51b. In the present embodiment, the direction in which the oil O flows in the tube member 50 is from the left side (+Y side) to the right side. That is, in the flow direction of the oil O in the tube member 50, the left side is the upstream side and the right side is the downstream side.

[0074] The arm portion 52 protrudes from the main body portion 51 in a direction perpendicular to the axial direction. In the present embodiment, the arm portion 52 protrudes from the portion of the main body portion 51 that is on the right side (-Y side) of the stator core 41 to the rear side (-X side). The arm portion 52 is located on the right side of the coil end portion 42b. Figure 3 and Figure 6As shown, the dimension of the arm 52 in the direction perpendicular to both the axial direction and the direction in which the arm 52 protrudes decreases as the distance from the body 51 increases. In the present embodiment, the direction perpendicular to both the axial direction and the direction in which the arm 52 protrudes is a substantially vertical direction.

[0075] The pin portion 53 protrudes axially from the arm portion 52. In the present embodiment, the pin portion 53 protrudes from the front end portion of the arm portion 52, that is, the rear end portion (-X side) toward the left side (+Y side). The pin portion 53 is substantially cylindrical. Figure 6 As shown, the pin portion 53 is supported by a support portion 26 provided on the peripheral wall portion 21. The support portion 26 is provided at the end portion on the right side (-Y side) of the peripheral wall portion 21. The support portion 26 protrudes to the right side. That is, the motor housing 20 has a support portion 26 protruding in the axial direction. The support portion 26 is in the shape of a cylinder protruding in the axial direction. The support portion 26 has a fitting hole 26a for the pin portion 53 to fit in. By fitting the pin portion 53 in the fitting hole 26a, the pipe component 50 can be properly positioned relative to the motor housing 20, and the pipe component 50 can be prevented from rotating around the axis extending in the axial direction. The fitting hole 26a is a hole that is recessed from the end surface on the right side of the support portion 26 to the left side. The fitting hole 26a is a hole having a bottom at the end portion on the left side. The front end portion of the arm portion 52 contacts the right side surface of the support portion 26.

[0076] The flange 54 protrudes from the main body 51 to the outside in the radial direction around the central axis of the cylindrical main body 51. The flange 54 is provided in the main body 51 between the arm 52 and the outlet 51b in the axial direction. The flange 54 is annular and surrounds the main body 51.

[0077] The rib 55 protrudes from the arm 52 toward the flange 54. The rib 55 is substantially triangular in shape when viewed in a direction perpendicular to both the axial direction and the direction in which the arm 52 protrudes. The rib 55 is in the shape of a plate with the plate surface facing the vertical direction. The rib 55 is connected to the main body 51, the arm 52, and the flange 54. By providing the rib 55, the strength of the arm 52 can be improved.

[0078] like Figure 5 As shown, at least a portion of the pipe member 50 is located inside the recess 21c. In the present embodiment, a portion of the main body 51 of the pipe member 50 located to the left (+Y side) of the arm 52 is located inside the recess 21c. When viewed in the vertical direction, at least a portion of the pipe member 50 overlaps with the tooth 43d located at the uppermost position among the plurality of teeth 43b. In the present embodiment, when viewed in the vertical direction, a portion of the main body 51 of the pipe member 50 located on the upper side of the stator core 41 on the other circumferential side (-θ side) overlaps with the tooth 43d.

[0079] The tooth 43d located at the uppermost position among the plurality of teeth 43b is a tooth 43b having a portion located at the uppermost position among the plurality of teeth 43b. The upper end of the tooth 43d is located at a position higher than the other teeth 43b. The tooth 43d is located on one side (+θ side) of the imaginary line L1 in the circumferential direction. In the present embodiment, the tooth 43d is the tooth 43b located closest to the imaginary line L1 in the circumferential direction among the plurality of teeth 43b.

[0080] In the present embodiment, the pipe member 50 is arranged offset in the circumferential direction to the side where the upper fixing portion 44a is located, that is, to the one circumferential side (+θ side) relative to the top 43t of the stator core body 43. In addition, regarding "the pipe member 50 is offset in the circumferential direction to the side where the upper fixing portion 44a is located relative to the top 43t", it is sufficient as long as the center CP1 of the main body 51 is at a different circumferential position from the top 43t. The center CP1 is the center of the substantially cylindrical main body 51. The center CP1 is the circumferential center of the main body 51 and the radial center.

[0081] The radial center CP1 of the pipe member 50 is located radially outward from the center CP2 of the bolt hole 44b of the upper fixing portion 44a. The center CP2 is the center of the substantially circular bolt hole 44b. The center CP2 is the circumferential center of the bolt hole 44b and the radial center of the bolt hole 44b. The center CP2 is located at the circumferential center of the upper fixing portion 44a. Figure 5 , an imaginary circle C is shown which is centered on the central axis J and passes through the center CP2. The center CP1 of the pipe member 50 is located radially outward from the imaginary circle C. The upper end of the main body 51 of the pipe member 50 is located above the upper end of the upper fixing portion 44a. The radially outer end of the main body 51 is located radially inward from the radially outer end of the upper fixing portion 44a.

[0082] like Figure 4 As shown in the figure, the pipe member 50 has a plurality of openings 56 provided in the main body 51. The plurality of openings 56 include a first opening 56a, a second opening 56b, a third opening 56c, and a fourth opening 56d. That is, the pipe member 50 has a first opening 56a, a second opening 56b, a third opening 56c, and a fourth opening 56d. The first opening 56a, the second opening 56b, the third opening 56c, and the fourth opening 56d are opened inside the first housing portion 20a. Each opening 56 is a supply port for supplying oil O as a refrigerant to the stator 40. More specifically, in the present embodiment, each opening 56 is an injection port for injecting a portion of the oil O flowing into the pipe member 50 to the outside of the pipe member 50.

[0083] Each opening 56 is formed by a hole penetrating the wall of the tubular main body 51 from the inner circumference to the outer circumference. Each opening 56 is an opening that opens on the outer circumference of the main body 51 among the openings of the hole penetrating the wall of the tubular main body 51 from the inner circumference to the outer circumference. Each opening 56 is, for example, substantially circular.

[0084] like Figure 4 As shown, the first opening 56a is provided in the portion of the main body 51 located above the stator core 41. A plurality of first openings 56a are provided at intervals in the axial direction. In the present embodiment, two first openings 56a are provided. Figure 5 As shown in FIG. 1 , the first opening 56a is an opening of the hole 56e that penetrates the wall of the main body 51 from the inner circumferential surface to the outer circumferential surface, and is an opening that opens on the outer circumferential surface of the main body 51. The hole 56e penetrates the main body 51 from the inner circumferential surface to the outer circumferential surface, and is located on one side (+θ side) of the circumferential direction and radially outward from the center CP1 in the main body 51. The hole 56e is located radially outward as it goes toward one side of the circumferential direction.

[0085] The first opening 56a opens in a direction obliquely inclined toward the radially outer side relative to the circumferential direction. The first opening 56a opens on one side (+θ side) in the circumferential direction and on the radially outer side. The first opening 56a opens in a direction obliquely inclined toward the upper side of the vertical direction relative to the front-back direction (X-axis direction). The first opening 56a opens on the front side (+X side) and the upper side (+Z side).

[0086] The first opening 56a opens toward the facing portion 25. Figure 5As shown by the middle dotted line, the oil O injected from the first opening 56a collides with the opposing portion 25. In the present embodiment, the oil O injected from the first opening 56a toward one circumferential side (+θ side) and radially outward, in other words, toward the front side (+X side) and the upper side (+Z side), collides with the opposing portion 25. The oil O that collides with the opposing portion 25 flows along the opposing portion 25 on the inner surface of the first housing portion 20a, passes through the radially outward side of the upper fixing portion 44a in the circumferential direction, and flows toward one circumferential side (+θ side) than the upper fixing portion 44a. Thus, compared with the case where the oil O injected from the first opening 56a collides with the upper fixing portion 44a, it is possible to suppress the momentum of the oil O from decreasing, and the oil O can easily pass over the upper fixing portion 44a. In addition, in the present embodiment, when viewed in the vertical direction, at least a portion of the pipe member 50 overlaps with the tooth 43d located most upward in the vertical direction among the plurality of teeth 43b. Therefore, the position of the pipe member 50 in the vertical direction relative to the stator core 41 can be made relatively close to the upper side, and the oil O ejected from the first opening 56a can be easily made to collide with the opposing portion 25 located on the upper side of the upper fixing portion 44a more appropriately. As a result, the oil O that has collided with the opposing portion 25 can be made to pass over the upper fixing portion 44a more easily. As described above, according to the present embodiment, the oil O supplied from the first opening 56a can be easily transported to the circumferential side of the upper fixing portion 44a, and the stator core 41 can be easily and appropriately cooled. Therefore, the cooling efficiency of the stator 40 can be improved. The oil O that passes over the upper fixing portion 44a and flows to the circumferential side more than the upper fixing portion 44a flows to the circumferential side along the outer peripheral surface 43c. The oil O that flows to the circumferential side along the outer peripheral surface 43c flows in the through groove 21b.

[0087] In addition, according to the present embodiment, the upper fixing portion 44a is located on the circumferential side (+θ side) of the top portion 43t, and the pipe member 50 is arranged to be offset in the circumferential direction to the side where the upper fixing portion 44a is located relative to the top portion 43t. Therefore, the pipe member 50 can be brought closer to the upper fixing portion 44a located on the circumferential side than the top portion 43t in the circumferential direction, and the distance between the first opening 56a and the facing portion 25 can be easily reduced. As a result, the oil O ejected from the first opening 56a can easily collide with the facing portion 25 while maintaining its momentum. Therefore, the oil O can easily pass over the upper fixing portion 44a.

[0088] In addition, according to the present embodiment, at least a portion of the pipe member 50 and at least a portion of the upper fixing portion 44a are located inside the recessed portion 21c. Therefore, it is easy to arrange the pipe member 50 and the upper fixing portion 44a close to each other. Thus, the oil O injected from the first opening 56a can easily pass over the upper fixing portion 44a.

[0089] In addition, in the present specification, “the opening of the tube member opens toward a certain object” means that, when an extension line is imaginarily extended from the opening to the direction toward which the opening is facing, the extension line passes through the certain object. In addition, in the case where the opening is composed of an opening of a hole that passes through the tube member from the inner peripheral surface to the outer peripheral surface, “the direction toward which the opening of the tube member is facing” is a direction toward the outside of the tube member in the direction in which the hole passes through the tube member from the inner peripheral surface to the outer peripheral surface. That is, for example, “the first opening 56a opens toward the opposing portion 25” means that, when an extension line is imaginarily extended from the first opening 56a to the direction toward which the first opening 56a is facing, the extension line passes through the opposing portion 25. The extension line is, for example, along Figure 5 The dashed arrow in FIG. 5 represents the oil O ejected from the first opening 56a. In addition, the “direction toward which the first opening 56a is directed” is the direction toward the outside of the tube member 50 in the direction in which the hole 56e penetrates the main body 51 from the inner circumference to the outer circumference. The direction toward which the first opening 56a is directed is Figure 5 In FIG. 5 , the dotted arrow in FIG. 5 shows the direction in which the oil O ejected from the first opening 56 a points.

[0090] In the present embodiment, the first opening portion 56a opens toward the second portion 25b in the opposing portion 25. The first opening portion 56a and the upper end portion of the upper fixing portion 44a are located at substantially the same position in the vertical direction. The first opening portion 56a is located at a position radially inward of the radially outer end portion of the upper fixing portion 44a. The first opening portion 56a is located at a position radially outward of the radial center CP2 of the bolt hole 44b in the upper fixing portion 44a. Therefore, the first opening portion 56a can be arranged at a position radially outward relative to the upper fixing portion 44a, so that the oil O ejected from the first opening portion 56a can easily pass through the radially outer side of the upper fixing portion 44a and more appropriately pass over the upper fixing portion 44a.

[0091] As described above, in the present embodiment, the radial center CP1 of the pipe member 50 is located radially outward from the radial center CP2 of the bolt hole 44b in the upper fixing portion 44a. Therefore, the pipe member 50 can be arranged radially outward relative to the upper fixing portion 44a, and the first opening 56a can be easily arranged radially outward relative to the upper fixing portion 44a. As a result, the oil O injected from the first opening 56a can easily pass over the upper fixing portion 44a.

[0092] In the present embodiment, the first opening 56a opens in a direction toward the bus bar assembly 86. Therefore, the oil O ejected from the first opening 56a easily collides with a portion of the motor housing 20 located near the bus bar assembly 86. Thus, the bus bar assembly 86 is easily cooled via the portion of the motor housing 20 that collides with the oil O. Specifically, in the present embodiment, the oil O ejected from the first opening 56a easily collides with a portion of the partition wall portion 24 of the motor housing 20 that is close to the connection hole 24a through which the bus bar assembly 86 passes. Therefore, the partition wall portion 24 is easily cooled by the oil O ejected from the first opening 56a, and the bus bar assembly 86 that passes into the connection hole 24a via the cooled partition wall portion 24 is easily cooled.

[0093] like Figure 4 As shown, the second opening 56b is provided in the portion of the main body 51 located on the upper side of the stator core 41. A plurality of second openings 56b are provided at intervals in the axial direction. In the present embodiment, two second openings 56b are provided. The axial positions of the two second openings 56b are respectively the same as the axial positions of the two first openings 56a. Figure 5 As shown, the second opening 56b is an opening portion that opens on the outer peripheral surface of the main body 51 among the opening portions of the hole 56f that penetrates the wall portion of the main body 51 from the inner peripheral surface to the outer peripheral surface. The hole 56f penetrates the main body 51 from the inner peripheral surface to the outer peripheral surface, and is located at a portion of the main body 51 that is located on the other side (-θ side) in the circumferential direction and radially inward of the center CP1. The hole 56f is located radially inward as it goes toward the other side in the circumferential direction. The second opening 56b is located radially inward of the center CP2 of the bolt hole 44b.

[0094] The second opening 56b opens in a direction different from that of the first opening 56a. Therefore, it is easy to make the oil O ejected from the second opening 56b collide with a portion different from the portion with which the oil O ejected from the first opening 56a collide. Thus, it is easy to cool the rotary electric machine 10 more appropriately by the oil O provided from the pipe member 50. In the present embodiment, the second opening 56b opens in a direction obliquely inclined toward the radial inner side relative to the circumferential direction. The second opening 56b opens on the other side (-θ side) in the circumferential direction and on the radial inner side. That is, the second opening 56b opens on the opposite side (-θ side) to the side where the upper fixing portion 44a is located in the circumferential direction and on the radial inner side. The second opening 56b opens in a direction obliquely inclined toward the lower side in the vertical direction relative to the front-rear direction (X-axis direction). The second opening 56b opens on the rear side (-X side) and on the lower side (-Z side).

[0095] The second opening 56b is opposed to the outer peripheral surface 43c of the stator core body 43. Therefore, the oil O injected from the second opening 56b can be supplied to the stator core body 43. Thus, the stator core body 43 can be cooled more appropriately. In addition, as described above, the second opening 56b is opened on the opposite side (-θ side) to the side where the upper fixing portion 44a is located in the circumferential direction and on the radially inner side. Therefore, the oil O injected from the second opening 56b is injected to the side opposite to the oil O injected from the first opening 56a in the circumferential direction. Therefore, the oil O can be appropriately supplied to both sides of the stator core body 43 in the circumferential direction through the first opening 56a and the second opening 56b. Therefore, the cooling efficiency of the stator 40 can be further improved. In particular, as described above, in the present embodiment, at least a portion of the pipe member 50 overlaps with the tooth 43d located most upward in the vertical direction among the plurality of teeth 43b when viewed in the vertical direction, and thus the pipe member 50 can be arranged near the top 43t of the stator core body 43. Therefore, by spraying the oil O from the pipe member 50 to both sides in the circumferential direction, it is easy to appropriately supply the oil O to the entire stator core body 43. As a result, it is possible to suppress uneven cooling of the stator core body 43, and the cooling efficiency of the stator 40 can be further improved.

[0096] In the present embodiment, the second opening 56b is opposed to a portion of the outer peripheral surface 43c of the stator core body 43 located between the top 43t and the upper fixing portion 44a in the circumferential direction. The oil O injected from the second opening 56b collides with the outer peripheral surface 43c of the stator core body 43 and then flows toward the other circumferential side (-θ side) along the outer peripheral surface 43c. The oil O flowing toward the other circumferential side along the outer peripheral surface 43c flows in the through groove 21b.

[0097] like Figure 4 As shown, in the present embodiment, a plurality of third openings 56c are provided at intervals in the circumferential direction in the portion of the main body 51 located on the upper side of the coil end 42a and the portion of the main body 51 located on the upper side of the coil end 42b. For example, two third openings 56c are provided in the portion of the main body 51 located on the upper side of the coil end 42a and the portion of the main body 51 located on the upper side of the coil end 42b. Each third opening 56c opens at the lower side. Each third opening 56c opens toward the coil ends 42a, 42b. Therefore, the oil O ejected from the third opening 56c can be provided to the coil ends 42a, 42b. Thus, the coil ends 42a, 42b can be cooled. Therefore, the cooling efficiency of the stator 40 can be further improved.

[0098] In the present embodiment, one fourth opening 56d is provided in each of a portion of the pipe member 50 located on the left side (+Y side) of the stator 40 and a portion of the pipe member 50 located on the right side (-Y side) of the stator 40. Each fourth opening 56d is opened at the bottom. The oil O injected from each fourth opening 56d is supplied to the bearings 34 and 35 that rotatably support the rotor 30.

[0099] like Figure 1 As shown, in the present embodiment, a refrigerant flow path 90 for circulating oil O as a refrigerant is provided in the drive device 100. The refrigerant flow path 90 is provided across the inside of the first housing portion 20a in the motor housing 20 and the inside of the gear housing 61. The refrigerant flow path 90 is a path for supplying the oil O stored in the gear housing 61 to the rotary electric machine 10 and returning it to the gear housing 61 again. The pump 71, the cooler 72, and the pipe member 50 are provided in the refrigerant flow path 90. The refrigerant flow path 90 has a first flow path portion 91, a second flow path portion 92, a third flow path portion 93, and a fourth flow path portion 94.

[0100] The first flow path portion 91, the second flow path portion 92, and the third flow path portion 93 are provided, for example, on the wall portion of the gear housing 61. The fourth flow path portion 94 is provided, for example, on the cover portion 23. The first flow path portion 91 connects the portion in which the oil O is stored in the interior of the gear housing 61 and the pump 71. The second flow path portion 92 connects the pump 71 and the cooler 72. The third flow path portion 93 connects the cooler 72 and the interior of the pipe member 50. In the present embodiment, the third flow path portion 93 is connected to the left end portion of the pipe member 50. The fourth flow path portion 94 connects the interior of the pipe member 50 and the interior of the shaft 31. In the present embodiment, the fourth flow path portion 94 is connected to the right end portion of the pipe member 50 and the right end portion of the shaft 31.

[0101] When the pump 71 is driven, the oil O stored in the gear housing 61 is sucked up through the first flow path portion 91 and flows into the cooler 72 through the second flow path portion 92. The oil O flowing into the cooler 72 is cooled in the cooler 72 and then flows into the inside of the pipe member 50 through the third flow path portion 93.

[0102] By allowing the oil O to flow into the pipe member 50 in this way, the oil O is ejected from each opening portion 56 as described above. A portion of the oil O that has flowed into the pipe member 50 is ejected from the first opening portion 56a, the second opening portion 56b, and the third opening portion 56c and is supplied to the stator 40. In the present embodiment, the oil O ejected from the first opening portion 56a and the second opening portion 56b is supplied to the stator core 41. The oil O ejected from the third opening portion 56c is supplied to the coil ends 42a, 42b. Another portion of the oil O that has flowed into the pipe member 50 is ejected from the fourth opening portion 56d and is supplied to the bearings 34, 35. The remaining portion of the oil O that has flowed into the pipe member 50 flows into the interior of the shaft 31 through the fourth flow path portion 94. A portion of the oil O that has flowed into the shaft 31 is scattered toward the stator 40 through the inside of the rotor body 32 from the hole portion 33. The other part of the oil O that has flowed into the shaft 31 is discharged from the opening on the left side of the shaft 31 into the gear housing 61 and is stored again in the gear housing 61 .

[0103] The oil O supplied from the openings 56 to the stator 40 or the bearings 34 and 35 and the oil O supplied from the shaft 31 to the stator 40 fall downward and accumulate in the lower area of ​​the motor housing 20. The oil O accumulated in the lower area of ​​the motor housing 20 returns to the gear housing 61 via the partition opening 22a provided in the partition portion 22.

[0104] <Second embodiment>

[0105] In the following description, for the same structure as the above-mentioned embodiment, the description is sometimes omitted by appropriately marking the same reference numerals. Figure 7 As shown, in the rotating electrical machine 210 of the present embodiment, the main body 251 of the pipe member 250 is arranged upward, that is, radially outward, away from the stator core body 43 compared to the main body 51 in the first embodiment.

[0106] The first opening 256a provided in the main body 251 opens toward a portion of the opposing portion 25 that is farther from the tube member 250 in the circumferential direction than the circumferential center of the upper fixing portion 44a, that is, the first portion 25a located on one side (+θ side) of the circumferential direction than the imaginary line L2. Therefore, the oil O injected from the first opening 256a can more easily pass over the upper fixing portion 44a. In the present embodiment, the first opening 256a opens in a direction slightly inclined in the vertical direction with respect to the front-rear direction X. The first opening 256a opens in a direction slightly inclined upward with respect to the direction straight toward the front side (+X side).

[0107] The second opening 256b provided in the main body 251 is located, for example, at a radially outer side than the center CP2 of the bolt hole 44b. The other structures of the main body 251 are the same as the other structures of the main body 51 of the first embodiment. The other structures of the pipe member 250 are the same as the other structures of the pipe member 50 of the first embodiment. The other structures of the rotating electric machine 210 are the same as the other structures of the rotating electric machine 10 of the first embodiment.

[0108] <Third embodiment>

[0109] In the following description, for the same structure as the above-mentioned embodiment, the description is sometimes omitted by appropriately marking the same reference numerals. Figure 8 As shown, in the stator 340 of the rotating electrical machine 310 of the present embodiment, the upper fixing portion 344a of the stator core 341 is provided at a position circumferentially farther from the pipe member 350 than the upper fixing portion 44a of the first embodiment. The upper fixing portion 344a is located below the lower end of the pipe member 350.

[0110] The circumferential dimensions of the recess 321c and the protrusion 321d of the first housing portion 320a in the motor housing 320 of the present embodiment are larger than the circumferential dimensions of the recess 21c and the protrusion 21d of the first embodiment. In the present embodiment, the motor housing 320 has a protrusion 327 protruding radially inward from the radially outer surface of the inner surface of the recess 321c. In the present embodiment, the radially inner surface of the protrusion 327 is substantially arc-shaped protruding radially inward when viewed in the axial direction. The protrusion 327 is located at a position closer to one side (+θ side) of the circumferential direction than the pipe member 350, and is located closer to the other side (−θ side) of the circumferential direction than the upper fixing portion 344a. The protrusion 327 is provided with a hole 327a recessed in the axial direction. The hole 327a is, for example, an internal threaded hole into which a bolt for fixing the cover 23 to the peripheral wall portion 321 is screwed.

[0111] In the present embodiment, the first opening portion 356a provided in the main body portion 351 of the pipe member 350 is open at the front side (+X side) and the lower side. The first opening portion 356a is open toward the second portion 25b in the opposing portion 25. More specifically, the first opening portion 356a is open toward a position in the opposing portion 25 that is opposite to the circumferential center portion of the upper fixing portion 344a. The first opening portion 356a is open toward a portion located between the protrusion 327 and the stator core body 43 in the radial direction. Therefore, as Figure 8As shown by the dotted arrow, the oil O injected from the first opening 356a passes between the convex portion 327 and the stator core body 43 in the radial direction and collides with the opposing portion 25. In this way, in the present embodiment, even if the convex portion 327 is provided on the inner surface of the concave portion 321c, the oil O injected from the first opening 356a can be appropriately collided with the opposing portion 25.

[0112] The other structures of the main body 351 are the same as those of the main body 51 of the first embodiment. The other structures of the pipe member 350 are the same as those of the pipe member 50 of the first embodiment. The other structures of the rotating electrical machine 310 are the same as those of the rotating electrical machine 10 of the first embodiment.

[0113] The present invention is not limited to the above-mentioned embodiments, and other structures and other methods can also be adopted within the scope of the technical concept of the present invention. The pipe component can be arranged at any position as long as it is located on the upper side of the stator core body in the vertical direction and at least a part of it overlaps with the tooth located most on the upper side in the vertical direction among the plurality of teeth when viewed in the vertical direction. The pipe component can also be arranged at a position overlapping with the top of the outer peripheral surface of the stator core body located most on the upper side in the vertical direction when viewed in the vertical direction.

[0114] The tube component only needs to have the first opening portion, and may not have other opening portions. The number of the first opening portions only needs to be one or more, and is not particularly limited. The shape of the first opening portion is not particularly limited. The first opening portion only needs to be open toward the opposing portion of the inner surface of the first housing portion that is opposite to the radially outer side of the upper fixing portion with a gap therebetween, and may be opened in any direction. In the case where a plurality of first opening portions are provided, the plurality of first opening portions may also include two or more first opening portions facing different directions.

[0115] The second opening portion may be opened in any direction as long as it opens in a direction different from that of the first opening portion. The number of the second opening portions is not particularly limited. The second opening portion may not be provided. The third opening portion may be opened in any direction as long as it opens toward the coil end portion. The number of the third opening portions is not particularly limited. The third opening portion may not be provided.

[0116] The tube component can be fixed to the housing having the first housing portion in any manner. The tube component only needs to have a tubular main body extending in the axial direction, and may not have an arm portion, a pin portion, a flange portion, and a rib portion. The tube component only needs to be a hollow component extending in the axial direction, and may be of any shape. For example, the tube component may be in the shape of a flat tube whose radial dimension is smaller than the circumferential dimension. One of the ends on both sides of the axial direction of the tube component may also be closed. A plurality of tube components may also be provided.

[0117] The refrigerant may flow into the interior of the tube member through any path. The refrigerant flowing into the interior of the tube member is not particularly limited as long as it can be supplied to the stator to cool the stator. The refrigerant may be, for example, an insulating liquid or water. When the refrigerant is water, the surface of the stator may be insulated. The refrigerant may flow out from the opening of the tube member in any manner.

[0118] The rotary electric machine to which the present invention is applied is not limited to a motor, but may also be a generator. The purpose of the rotary electric machine is not particularly limited. For example, the rotary electric machine may be mounted on a vehicle for purposes other than rotating an axle, or may be mounted on equipment other than a vehicle. The posture when using the rotary electric machine is not particularly limited. The central axis of the rotary electric machine may be in a direction intersecting the vertical direction, or in a direction inclined relative to the horizontal direction. Regarding the number of fixing parts in the stator core of the rotary electric machine, it is not particularly limited as long as at least one upper fixing part is provided.

[0119] In addition, the present technology can adopt the following structures.

[0120] (1) A rotating electrical machine, comprising: a rotor rotatable about a central axis extending in a direction intersecting a vertical direction; a stator having a stator core located radially outward of the rotor; a housing having a first housing portion for housing the rotor and the stator; and a hollow pipe member extending in an axial direction and housed in the first housing portion, the stator core comprising: a stator core body having a cylindrical core back surrounding the rotor and a plurality of teeth protruding radially inward from the core back; and at least one fixing portion extending radially inward from an outer peripheral surface of the stator core body. The at least one fixing portion protrudes outward, and includes an upper fixing portion located at an upper side of the central axis in the vertical direction, the upper fixing portion is located on one side of the circumferential direction of the tube component, the tube component has a first opening portion opened inside the first housing portion, and the tube component is located at the upper side of the stator core body in the vertical direction, when viewed along the vertical direction, at least a portion of the tube component overlaps with a tooth located most upward in the vertical direction among the plurality of teeth, the inner surface of the first housing portion has an opposing portion opposed to the radially outer side of the upper fixing portion with a gap therebetween, and the first opening portion opens toward the opposing portion.

[0121] (2) A rotating electrical machine according to (1), wherein the stator core body has a top portion, the top portion being located at a position on the upper side of the outer peripheral surface of the stator core body in the vertical direction, the upper fixing portion being located at a position on the circumferential side of the top portion, and the pipe component being arranged to be offset in the circumferential direction toward the side where the upper fixing portion is located relative to the top portion.

[0122] (3) The rotating electrical machine according to (1) or (2), wherein the upper fixing portion has a bolt hole extending in the axial direction, and the first opening is located radially outward of a radial center of the bolt hole.

[0123] (4) The rotating electrical machine according to (3), wherein the radial center of the pipe member is located radially outward of the radial center of the bolt hole.

[0124] (5) The rotating electrical machine according to any one of (1) to (4), wherein the inner surface of the first housing portion has a recessed portion recessed radially outward, and at least a portion of the pipe member and at least a portion of the upper fixing portion are located inside the recessed portion.

[0125] (6) A rotating electric machine according to (5), wherein the rotating electric machine comprises: a bus bar assembly having a bus bar electrically connected to the stator; and a substrate electrically connected to the stator via the bus bar, the housing having a second housing portion for housing the substrate therein, and when viewed in a direction perpendicular to both the axial direction and the vertical direction, at least a portion of the bus bar assembly overlaps with the recess, and the substrate is located on the upper side of the recess in the vertical direction.

[0126] (7) The rotating electrical machine according to (6), wherein the housing has a connection hole connecting the interior of the first housing portion and the interior of the second housing portion, the bus bar assembly is inserted into the connection hole, and the first opening is opened in a direction toward the bus bar assembly.

[0127] (8) A rotating electrical machine according to any one of (5) to (7), wherein the housing has a convex portion protruding radially inward from a surface located radially outward of an inner surface of the recess, and the first opening portion opens toward a portion located radially between the convex portion and the stator core body.

[0128] (9) The rotating electrical machine according to any one of (1) to (8), wherein the first opening portion opens toward a portion of the opposing portion that is circumferentially farther from the pipe member than a circumferential center of the upper fixing portion.

[0129] (10) The rotating electrical machine according to any one of (1) to (9), wherein the pipe member has a second opening portion that opens inside the first housing portion, and the second opening portion opens in a direction different from that of the first opening portion.

[0130] (11) The rotating electrical machine according to (10), wherein the second opening portion opens in the circumferential direction to the side opposite to the side where the upper fixing portion is located and in the radial direction inward, and the second opening portion faces the outer peripheral surface of the stator core body.

[0131] (12) A rotating electrical machine according to any one of (1) to (11), wherein the stator has a coil end portion protruding axially beyond the stator core, and the tube member has a third opening portion opening inside the first housing portion, the third opening portion opening toward the coil end portion.

[0132] (13) A rotating electrical machine according to any one of (1) to (12), wherein the tube component comprises: a main body portion extending in the axial direction; an arm portion protruding from the main body portion in a direction perpendicular to the axial direction; and a pin portion protruding from the arm portion in the axial direction, and the housing comprises a supporting portion protruding in the axial direction, and the supporting portion comprises a fitting hole for the pin portion to fit into.

[0133] (14) A drive device comprising: the rotating electrical machine described in any one of (1) to (13); and a gear mechanism connected to the rotating electrical machine.

[0134] The configurations described above in this specification can be appropriately combined within a range that does not contradict each other.

[0135] Description of symbols

[0136] 10, 210, 310: rotating electrical machine; 20: motor housing (housing); 20a, 320a: first housing portion; 20b: second housing portion; 21c, 321c: recessed portion; 24a: connecting hole; 25: opposing portion; 26: supporting portion; 26a: fitting hole; 30: rotor; 40, 340: stator; 41, 341: stator core; 42a, 42b: coil end; 43: stator core body; 43a: core back; 43b, 43d: teeth; 43c: outer peripheral surface; 43 t: top; 44: fixing portion; 44a, 344a: upper fixing portion; 44b: bolt hole; 50, 250, 350: pipe part; 51, 251, 351: main body; 52: arm portion; 53: pin portion; 56a, 256a, 356a: first opening portion; 56b, 256b: second opening portion; 56c: third opening portion; 60: gear mechanism; 84: substrate; 86: busbar assembly; 86a: busbar; 100: driving device; 327: convex portion; J: center axis.

Claims

1. A rotating electrical machine, comprising: A rotor capable of rotating about a central axis extending in a direction intersecting the vertical direction; a stator having a stator core located radially outside the rotor; a housing having a first housing portion for housing the rotor and the stator therein; and a tube member which is hollow, extends in the axial direction, and is accommodated in the first accommodation portion; The stator core has: a stator core body having a cylindrical core back surrounding the rotor and a plurality of teeth protruding radially inward from the core back; and at least one fixing portion protruding radially outward from the outer peripheral surface of the stator core body, The at least one fixing portion includes an upper fixing portion located vertically above the central axis. The upper fixing portion is located on one side of the tube member in the circumferential direction. The pipe member has a first opening portion that opens inside the first housing portion, and the pipe member is located on the upper side in the vertical direction of the stator core body. When viewed in the vertical direction, at least a portion of the tube member overlaps with a tooth located most upward in the vertical direction among the plurality of teeth. The inner surface of the first housing portion has an opposing portion that opposes the radially outer side of the upper fixing portion with a gap therebetween. The first opening is opened toward the facing portion.

2. The rotating electrical machine according to claim 1, wherein: The stator core body has a top portion, and the top portion is located at a position on the upper side in the vertical direction of the outer peripheral surface of the stator core body. The upper fixing portion is located closer to one side in the circumferential direction than the top portion. The pipe member is disposed so as to be offset in the circumferential direction with respect to the top portion toward the side where the upper fixing portion is located.

3. The rotating electrical machine according to claim 1, wherein: The upper fixing portion has a bolt hole extending in the axial direction. The first opening is located radially outward of the radial center of the bolt hole.

4. The rotating electrical machine according to claim 3, wherein: The radial center of the pipe member is located radially outward of the radial center of the bolt hole.

5. The rotating electrical machine according to claim 1, wherein: The inner surface of the first housing portion has a recessed portion recessed radially outward. At least a portion of the pipe member and at least a portion of the upper fixing portion are located inside the recessed portion.

6. The rotating electrical machine according to claim 5, wherein: The rotating electrical machine has: a bus bar assembly having a bus bar electrically connected to the stator; and a substrate electrically connected to the stator via the bus bar, The housing has a second housing portion for housing the substrate therein. When viewed in a direction perpendicular to both the axial direction and the vertical direction, at least a portion of the bus bar assembly overlaps with the recessed portion. The substrate is located on the upper side of the recess in the vertical direction.

7. The rotating electrical machine according to claim 6, wherein: The housing has a connection hole connecting the interior of the first housing portion and the interior of the second housing portion. The busbar assembly is passed into the connection hole, The first opening opens in a direction toward the bus bar assembly.

8. The rotating electrical machine according to claim 5, wherein: The housing has a convex portion protruding radially inward from a radially outer side of an inner surface of the concave portion, The first opening is opened toward a portion located between the protrusion and the stator core body in a radial direction.

9. The rotating electrical machine according to any one of claims 1 to 8, wherein: The first opening is opened toward a portion of the facing portion that is farther from the pipe member in the circumferential direction than the center in the circumferential direction of the upper fixing portion.

10. The rotating electrical machine according to any one of claims 1 to 8, wherein: The tube member has a second opening portion opened inside the first housing portion, The second opening opens in a direction different from that of the first opening.

11. The rotating electrical machine according to claim 10, wherein: The second opening is opened in the circumferential direction to the side opposite to the side where the upper fixing portion is located and to the radially inner side, and the second opening faces the outer peripheral surface of the stator core body.

12. The rotating electrical machine according to any one of claims 1 to 8, wherein: The stator has coil ends protruding in the axial direction from the stator core. The tube member has a third opening portion opened inside the first housing portion, The third opening is opened toward the coil end.

13. The rotating electrical machine according to any one of claims 1 to 8, wherein: The pipe component has: a main body portion extending in the axial direction; an arm portion protruding from the main body portion in a direction perpendicular to the axial direction; and a pin portion, which protrudes axially from the arm portion, The housing has a supporting portion protruding in the axial direction. The support portion has a fitting hole into which the pin portion is fitted.

14. A driving device, comprising: The rotating electrical machine according to any one of claims 1 to 8; and A gear mechanism is connected to the rotating motor.

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