Rotating electrical machine and drive device

Abstract

The present invention is provided with: a rotor capable of rotating about a central axis; a stator having a stator core facing the rotor with a gap therebetween in the radial direction; and a guide member disposed on one side of the stator core in the axial direction and supplying the refrigerant in the circumferential direction. The stator core is provided with a plurality of stator flow paths, and the plurality of stator flow paths penetrate the stator core in the axial direction, and a refrigerant flows through the plurality of stator flow paths. The plurality of stator flow paths are respectively arranged at different positions in the circumferential direction. The guide member has a connection flow path portion that connects the plurality of stator flow paths, and is configured from a plurality of flow path members stacked in the axial direction.

Description

Technical Field

[0001] This invention relates to rotary electric machines and drive devices. This application claims priority based on Japanese Patent Application No. 2023-141793, filed on August 31, 2023, the contents of which are incorporated herein by reference. Background Technology

[0002] A rotary motor is known to have a cooling oil supply pipe with spray nozzles for spraying cooling oil positioned above the stator, thereby supplying cooling oil sprayed from the nozzles to the stator and cooling the stator core (e.g., Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Publication No. 2012-130119. Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] In rotating motors like those described above, for example, the amount of cooling oil supplied to the stator in the circumferential direction is prone to deviation, which can easily lead to uneven stator temperature. As a result, the temperature of a part of the stator may become too high.

[0008] In view of the above, one objective of the present invention is to provide a rotary motor and drive device that can suppress the temperature rise of the stator as a whole.

[0009] Methods for solving problems

[0010] One embodiment of the rotary electric motor of the present invention comprises: a rotor capable of rotating about a central axis; a stator having a stator core opposed to the rotor in the radial direction with a gap; and a guide member disposed on one axial side of the stator core, supplying refrigerant circumferentially. A plurality of stator flow paths are provided in the stator core, the plurality of stator flow paths axially penetrating the stator core and supplying refrigerant flow. The plurality of stator flow paths are respectively disposed at mutually different positions in the circumferential direction. The guide member has a connecting flow path portion connecting the plurality of stator flow paths, and is composed of a plurality of flow path members stacked axially.

[0011] One embodiment of the drive device of the present invention includes: the aforementioned rotary motor; and a gear mechanism connected to the rotor.

[0012] The effects of the invention

[0013] According to one aspect of the present invention, the temperature rise of the stator as a whole can be suppressed in a rotating electric motor and a drive device. Attached Figure Description

[0014] Figure 1 This is a schematic diagram illustrating the drive device of the first embodiment.

[0015] Figure 2 This is a cross-sectional view showing the rotary electric motor of the first embodiment.

[0016] Figure 3 This is a perspective view showing the guide member and supply flow path of the first embodiment.

[0017] Figure 4 This is a cross-sectional view showing a portion of the rotary electric motor according to the first embodiment.

[0018] Figure 5 This is a partially enlarged cross-sectional view showing a portion of the rotary electric motor according to the first embodiment.

[0019] Figure 6 This is an external view of the guide member of the first embodiment when viewed from the axial side.

[0020] Figure 7 This is an exploded perspective view showing the guide member of the first embodiment.

[0021] Figure 8 This is a second view of the guide member of the first embodiment when viewed from the axial side.

[0022] Figure 9 This is a cross-sectional view showing a portion of the rotary electric motor according to the first embodiment, and is... Figure 6 IX-IX sectional view.

[0023] Figure 10 This is an exploded perspective view showing the guide member of the second embodiment.

[0024] Figure 11 This is a cross-sectional view showing a portion of the rotary electric motor according to the second embodiment.

[0025] Figure 12 This is an exploded perspective view showing the guide member of the third embodiment.

[0026] Figure 13 This is a cross-sectional view showing a portion of the rotary electric motor according to the third embodiment.

[0027] Figure 14 This is a cross-sectional view showing the rotary electric motor according to the fourth embodiment.

[0028] Figure 15 This is an exploded perspective view showing the guide member of the fourth embodiment. Detailed Implementation

[0030] In the following description, the vertical direction is defined and explained based on the positional relationship when the drive unit of the embodiment is mounted on a vehicle located on a horizontal road surface. That is, the positional relationship relative to the vertical direction described in the following embodiments is sufficient as long as the drive unit is mounted on a vehicle located on a horizontal road surface.

[0031] In the accompanying drawings, the XYZ coordinate system is appropriately represented 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 vertical direction, and the -Z side is the lower vertical direction. In the following description, the upper vertical direction is simply referred to as the "upper side," and the lower vertical direction is simply referred to as the "lower side." The X-axis direction is orthogonal to the Z-axis direction and is the longitudinal direction of the vehicle carrying the drive unit. 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 orthogonal to both the X-axis and Z-axis directions and is the left-right direction of the vehicle, i.e., the vehicle width direction. In the following embodiments, the +Y side is the right side of the vehicle, and the -Y side is the left side of the vehicle.

[0032] It should be noted that the front-to-back positional relationship is not limited to the positional relationship in the following implementation. It could also be that the +X side is the rear side of the vehicle, and the -X side is the front side of the vehicle. In this case, the +Y side is the left side of the vehicle, and the -Y side is the right side of the vehicle. Furthermore, in this specification, "parallel direction" includes substantially parallel directions, and "orthogonal direction" includes substantially orthogonal directions.

[0033] The central axis J shown in each figure is a virtual axis extending along the Y-axis direction, that is, along the left-right direction of the vehicle. In this embodiment, the central axis J extends in a direction orthogonal to the vertical direction (Z-axis direction). That is, the central axis J extends in a direction intersecting the vertical direction. In the following description, the direction parallel to the central axis J is simply referred to as "axial direction", the radial direction centered on the central axis J is simply referred to as "radial direction", and the circumferential direction centered on the central axis J is simply referred to as "circumferential direction". In addition, the +Y side is referred to as "axial side", and the -Y side is referred to as "axial side".

[0034] The circumferential direction is represented by arrow θ in each diagram. The side in the circumferential direction that arrow θ points towards (the +θ side) is called the "circumferential side". The side in the circumferential direction opposite to the side in the direction arrow θ points towards (the -θ side) is called the "circumferential side". The circumferential side is the side that moves clockwise around the central axis J when viewed from the right (+Y side). The circumferential side is the side that moves counterclockwise around the central axis J when viewed from the right.

[0035] <First Implementation>

[0036] Figure 1The drive unit 1 shown in this embodiment is a drive unit mounted on a vehicle to rotate the axle 73. Vehicles equipped with drive unit 1 are hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHVs), electric vehicles (EVs), and other vehicles powered by an electric motor. Drive unit 1 includes a rotary motor 10, a gear mechanism 70 connected to the rotary motor 10, a housing 63 that internally houses the rotary motor 10 and the gear mechanism 70, and a refrigerant flow path 90. In this embodiment, the rotary motor 10 is an electric motor.

[0037] The housing 63 internally houses the rotary motor 10 and the gear mechanism 70. The housing 63 has a motor housing 63a that internally houses the rotary motor 10 and a gear housing 63b that internally houses the gear mechanism 70. The motor housing 63a is connected to the right side (+Y side) of the gear housing 63b. The motor housing 63a internally houses the refrigerant L. The refrigerant L is stored in the lower region within the motor housing 63a. The motor housing 63a has a peripheral wall portion 63c, a partition wall portion 63d, and a cover portion 63e. The peripheral wall portion 63c and the partition wall portion 63d are, for example, part of the same single component. The cover portion 63e is, for example, separate from the peripheral wall portion 63c and the partition wall portion 63d.

[0038] The peripheral wall portion 63c is a cylindrical shape that surrounds the central axis J and opens on the right side (+Y side). The peripheral wall portion 63c radially surrounds the rotary motor 10. A partition wall portion 63d is connected to the left side (-Y side) of the peripheral wall portion 63c. The partition wall portion 63d axially separates the interior of the motor housing 63a from the interior of the gear housing 63b. The partition wall portion 63d has a partition wall opening 63f connecting the interior of the motor housing 63a to the interior of the gear housing 63b. A bearing 64a is held in the partition wall portion 63d. A cover portion 63e is fixed to the right end of the peripheral wall portion 63c. The cover portion 63e blocks the opening of the peripheral wall portion 63c. A bearing 64b is held in the cover portion 63e.

[0039] The gear housing 63b internally houses the refrigerant L. The refrigerant L is stored in the lower region within the gear housing 63b. The refrigerant L circulates in the refrigerant flow path 90. In this embodiment, the refrigerant L is a lubricating oil used to cool the rotary motor 10 and lubricate the gear mechanism 70. For example, to perform both cooling and lubrication functions, it is preferable to use an oil with a low viscosity, such as Automatic Transmission Fluid (ATF).

[0040] The gear mechanism 70 is connected to the rotor 15 of the rotary motor 10 (described later) and transmits the rotation of the rotor 15 to the vehicle axle 73. In this embodiment, the gear mechanism 70 includes: a reduction gear 71 connected to the rotor 15; and a differential gear 72 connected to the reduction gear 71. The differential gear 72 has a gear ring 72a. The torque output from the rotary motor 10 is transmitted to the gear ring 72a via the reduction gear 71. The lower end of the gear ring 72a is immersed in a refrigerant L stored in the gear housing 63b. When the gear ring 72a rotates, the refrigerant L is lifted, and the lifted refrigerant L lubricates the reduction gear 71 and the differential gear 72.

[0041] The rotary electric motor 10 includes: a rotor 15 rotatable about a central axis J; a stator 30 radially opposed to the rotor 15 with a gap; and a guide member 40. The rotor 15, stator 30, and guide member 40 are each housed in a housing 63. More specifically, the rotor 15, stator 30, and guide member 40 are each housed in a motor housing 63a. In this embodiment, the stator 30 is disposed radially outward of the rotor 15. The stator 30 and guide member 40 are fixed to the motor housing 63a. The rotor 15 includes a rotor core 16 and a shaft 17.

[0042] Shaft 17 is a cylindrical shape extending axially around the central axis J. Shaft 17 can also be a cylindrical shape extending axially around the central axis J. Shaft 17 is disposed inside the motor housing 63a. The left end of shaft 17 protrudes into the gear housing 63b. The right end of shaft 17 is supported by bearing 64b and is rotatable. The left end (-Y side) of shaft 17 is supported by bearing 64a and is rotatable. Thus, shaft 17 can rotate around the central axis J.

[0043] The rotor core 16 is approximately annular, centered on the central axis J. The rotor core 16 is made of magnetic material. The rotor core 16 is fixed to the outer circumferential surface of the shaft 17. Thus, the rotor core 16 can rotate about the central axis J. That is, the rotor 15 can rotate about the central axis J. Multiple magnets (not shown) are fixed to the rotor core 16. These magnets are arranged circumferentially.

[0044] like Figure 2 As shown, the stator 30 includes a stator core 31, an insulator 34, and a coil portion 35. The stator core 31 is annular with its central axis J as the center. In this embodiment, the stator core 31 is approximately annular with its central axis J as the center. The stator core 31 may also be octagonal or other shapes. The stator core 31 surrounds the rotor core 16 radially outward. The stator core 31 is radially opposed to the rotor 15 with a gap. The stator core 31 has a core back 32, multiple teeth 33, and a first fastening hole 31a. Multiple stator flow paths 96 are provided in the stator core 31.

[0045] The back of the core 32 is annular about the central axis J. In this embodiment, the back of the core 32 is approximately annular about the central axis J. Multiple teeth 33 protrude radially from the back of the core 32. In this embodiment, each tooth 33 protrudes radially inward from the inner circumferential surface of the back of the core 32. In this embodiment, the stator 30 has eight teeth 33. The number of teeth 33 in the stator 30 can be seven or less, or nine or more. Each tooth 33 is arranged circumferentially at approximately equal intervals along the inner circumferential surface of the back of the core 32. Each tooth 33 is radially opposed to the rotor core 16 with a gap between them.

[0046] The first fastening hole 31a is a hole that penetrates the stator core 31 axially. The stator core 31 has a plurality of first fastening holes 31a. In this embodiment, the stator core 31 has six first fastening holes 31a. The number of first fastening holes 31a in the stator core 31 can be five or less, or seven or more. The first fastening holes 31a are arranged at approximately equal intervals along the circumferential direction. Each first fastening hole 31a is provided at the radial outer edge of the stator core 31. In this embodiment, each first fastening hole 31a opens radially outward. The inner surface of each first fastening hole 31a is connected to the outer peripheral surface of the stator core 31. It should be noted that each first fastening hole 31a may also not open radially outward.

[0047] Multiple stator flow paths 96 are holes that penetrate the stator core 31 along the axial direction. When viewed axially, each stator flow path 96 is an elongated hole extending circumferentially. When viewed axially, the shape of each stator flow path 96 can also be other shapes such as circular or rectangular. Figure 1 As shown, refrigerant L flows inside each stator flow path 96. Figure 2 As shown, in this embodiment, twenty-four stator flow paths 96 are provided in the stator core 31. The number of stator flow paths 96 provided in the stator core 31 can be twenty-three or less, or twenty-five or more. Each stator flow path 96 is arranged at intervals along the circumferential direction. That is, multiple stator flow paths 96 are respectively arranged at different positions in the circumferential direction. In this embodiment, multiple stator flow paths 96 are provided on the back side 32 of the core.

[0048] Insulator 34 insulates the stator core 31 and the coil section 35. Insulator 34 is fitted to each of the plurality of teeth 33. The coil section 35 is fitted to the teeth 33. In this embodiment, the stator 30 has eight coil sections 35. Each coil section 35 is fitted to a different tooth 33 via insulator 34. Figure 1As shown, the portion of each coil section 35 on one axial side is located on the axial side of the stator core 31. The portion of each coil section 35 on the other axial side is located on the other axial side of the stator core 31.

[0049] Although not shown in the diagram, the coil section 35 is electrically connected to an external power source (not shown). When current is supplied to the coil section 35 from the external power source, each coil section 35 constitutes an electromagnet. At this time, heat and Joule heating caused by iron loss are generated in each coil section 35, thus the temperature of each coil section 35 rises. Furthermore, the heat generated in each coil section 35 is transferred to the stator core 31. As a result, the temperature of the stator 30, including the stator core 31, rises. If the temperature of each coil section 35 becomes too high, each coil section 35 may deteriorate. Therefore, in this embodiment, the heat generated in each coil section 35 is transferred via the stator core 31 to the refrigerant L flowing inside each stator flow path 96, thereby dissipating heat to the outside of the rotary motor 10. This prevents the temperature of the stator 30, especially the coil section 35, from becoming too high.

[0050] like Figure 3 As shown, the guide member 40 is a plate-shaped structure extending in a direction orthogonal to the axial direction. In this embodiment, the guide member 40 is a generally annular plate centered on the central axis J. The guide member 40 can also be other shapes, such as an octagon centered on the central axis J. Figure 4 As shown, the guide member 40 is disposed on one axial side of the stator core 31. The guide member 40 is fixed to the axially facing surface of the stator core 31 by adhesive. The guide member 40 is in contact with the axially facing surface of the stator core 31. That is, the guide member 40 is in axial contact with the stator core 31. Figure 1 As shown, the guide member 40 is radially opposed to the coil portion 35. Therefore, according to this embodiment, compared to the case where the guide member 40 is arranged axially opposite to the coil portion 35, i.e., arranged on the side axially closer to the coil portion 35, the guide member 40 can be arranged axially closer to the stator core 31. Therefore, it is possible to suppress the axial enlargement of the rotary motor 10 and the drive device 1.

[0051] The guide member 40 has a connecting flow path portion 95 that connects multiple stator flow paths 96. For example... Figure 3 As shown, the guide member 40 has a second fastening hole 40g and a mounting hole 40h. (As...) Figure 4 As shown, the guide member 40 is composed of a plurality of flow path members 40a stacked in the axial direction.

[0052] The second fastening hole 40g is a hole that passes through the guide member 40 axially. For example... Figure 3As shown, the guide member 40 has a plurality of second fastening holes 40g. In this embodiment, the guide member 40 has six second fastening holes 40g. Each second fastening hole 40g is arranged at approximately equal intervals along the circumferential direction. Each second fastening hole 40g is disposed at the radial outer edge of the guide member 40. In this embodiment, each second fastening hole 40g opens radially outward. Each second fastening hole 40g may also not open radially outward. Figure 5 As shown, when viewed from the axial direction, each of the second fastening hole portions 40g overlaps with the different first fastening hole portions 31a.

[0053] like Figure 6 As shown, the mounting hole 40h is a hole that passes through the guide member 40 axially. When viewed axially, the mounting hole 40h is a generally circular hole. In this embodiment, the mounting hole 40h is an internally threaded hole. In this embodiment, the guide member 40 has two mounting holes 40h. Each mounting hole 40h is provided on the upper (+Z side) portion of the guide member 40. The mounting holes 40h are arranged at intervals in the front-rear direction (X-axis direction).

[0054] like Figure 4 As shown, in this embodiment, the plurality of flow path components 40a include a first flow path component 41, a second flow path component 42, and a third flow path component 43. The first flow path component 41, the second flow path component 42, and the third flow path component 43 are each plate-shaped, extending in a direction orthogonal to the axial direction. The first flow path component 41, the second flow path component 42, and the third flow path component 43 are arranged in this order from one axial side. In this embodiment, the first flow path component 41, the second flow path component 42, and the third flow path component 43 are respectively fixed to each other by an adhesive. Thus, the first flow path component 41, the second flow path component 42, and the third flow path component 43 constitute a guide component 40.

[0055] like Figure 7 As shown, in this embodiment, the first flow path component 41 is approximately annular plate centered on the central axis J. The first flow path component 41 can also be other shapes such as an octagon centered on the central axis J. The first flow path component 41 has a first inlet hole 41a, a fastening hole 41g, and a mounting hole 41h. The first inlet hole 41a, the fastening hole 41g, and the mounting hole 41h are holes that axially penetrate the first flow path component 41.

[0056] The first inlet hole 41a is provided on the upper (+Z side) portion of the first flow path member 41. In this embodiment, when viewed axially, the first inlet hole 41a is a circular hole. The first flow path member 41 has six fastening holes 41g. Each fastening hole 41g is arranged at approximately equal intervals along the circumferential direction. Each fastening hole 41g is located on the radial outer edge of the first flow path member 41. Each fastening hole 41g opens radially outward. Each fastening hole 41g constitutes... Figure 3 A portion of each of the second fastening holes 40g shown.

[0057] Viewed axially, the mounting holes 41h are approximately circular. The first flow path member 41 has two mounting holes 41h. Each mounting hole 41h is located on the upper (+Z side) portion of the first flow path member 41. The mounting holes 41h are spaced apart in the front-to-back direction (X-axis direction). Each mounting hole 41h is positioned to sandwich the first inflow hole 41a in the front-to-back direction. Each mounting hole 41h constitutes... Figure 3 A portion of each mounting hole shown in Figure 40h.

[0058] In this embodiment, the second flow path component 42 is a generally annular plate centered on the central axis J. The second flow path component 42 can also be other shapes such as an octagon centered on the central axis J. Figure 4 As shown, the second flow path member 42 is positioned on the opposite side of the axial direction compared to the first flow path member 41. For example... Figure 7 As shown, the second flow path component 42 has a second flow path portion 42a, a first connecting hole 42c, a plurality of first connecting holes 42e, a fastening hole 42g, and a mounting hole 42h. The second flow path portion 42a, the first connecting hole 42c, the plurality of first connecting holes 42e, the fastening hole 42g, and the mounting hole 42h are holes that penetrate the second flow path component 42 axially.

[0059] The second flow path portion 42a is provided on the upper side (+Z side) of the second flow path member 42. In this embodiment, when viewed axially, the second flow path portion 42a is a circular hole. The second flow path portion 42a may also be a hole recessed from one axial side facing the second flow path member 42 to the other axial side. When viewed axially, at least a portion of the second flow path portion 42a overlaps with at least a portion of the first inflow hole 41a. Thus, the second flow path portion 42a and the first inflow hole 41a are connected axially.

[0060] The first connecting hole 42c is a hole extending downward (towards the -Z side) from the second flow path portion 42a. The first connecting hole 42c is radially connected to the second flow path portion 42a. The plurality of first connecting holes 42e are elongated holes extending circumferentially. In this embodiment, the second flow path member 42 has twenty-four first connecting holes 42e. The plurality of first connecting holes 42e are arranged at approximately equal intervals along the circumferential direction. The first connecting hole 42e located at the uppermost (+Z side) of the plurality of first connecting holes 42e is connected to the first connecting hole 42c. Thus, at least one first connecting hole 42e is connected to the second flow path portion 42a via the first connecting hole 42c. Furthermore, as... Figure 6 As shown, the plurality of first connecting holes 42e are positioned lower (-Z side) than the first inflow hole 41a. That is, the first inflow hole 41a is positioned higher (+Z side) in the vertical direction than the plurality of first connecting holes 42e.

[0061] like Figure 7 As shown, the second flow path member 42 has six fastening holes 42g. The fastening holes 42g are arranged at approximately equal intervals along the circumference. Each fastening hole 42g is located at the radial outer edge of the second flow path member 42. Each fastening hole 42g opens radially outward. When viewed axially, each fastening hole 42g overlaps with a different fastening hole 41g. The fastening holes 42g constitute... Figure 3 A portion of each of the second fastening holes 40g shown.

[0062] Viewed axially, the mounting holes 42h are approximately circular. The second flow path member 42 has two mounting holes 42h. Each mounting hole 42h is located on the upper (+Z side) portion of the second flow path member 42. The mounting holes 42h are spaced apart in the front-to-back direction (X-axis direction). The mounting holes 42h are positioned to sandwich the second flow path portion 42a in the front-to-back direction. Viewed axially, each mounting hole 42h overlaps with a different mounting hole 41h. Each mounting hole 42h constitutes... Figure 3 A portion of each mounting hole shown in Figure 40h.

[0063] In this embodiment, the third flow path component 43 is a generally annular plate centered on the central axis J. The third flow path component 43 can also be other shapes, such as an octagon centered on the central axis J. Figure 4 As shown, the third flow path member 43 is disposed between the second flow path member 42 and the stator core 31. The side of the third flow path member 43 facing the opposite axial direction is fixed to the stator core 31 by adhesive. The third flow path member 43 is in contact with the stator core 31. Figure 7As shown, the third flow path component 43 has multiple second connecting holes 43a, fastening holes 43g, and mounting holes 43h. The multiple second connecting holes 43a, fastening holes 43g, and mounting holes 43h are holes that penetrate the third flow path component 43 axially.

[0064] The plurality of second connecting holes 43a are elongated holes extending circumferentially. In this embodiment, the third flow path member 43 has twenty-four second connecting holes 43a. The plurality of second connecting holes 43a are arranged at approximately equal intervals along the circumferential direction. Figure 8 As shown, when viewed axially, the plurality of second connecting holes 43a overlap with the first connecting holes 42e respectively. More specifically, when viewed axially, the plurality of second connecting holes 43a overlap with a pair of first connecting holes 42e arranged adjacent to each other in the circumferential direction. Thus, as Figure 9 As shown, the portion of each second connecting hole 43a on the other side (-θ side) in the circumferential direction is axially connected to the first connecting hole 42e of the pair of first connecting holes 42e located on the other side in the circumferential direction. Furthermore, the portion of each second connecting hole 43a on one side (+θ side) in the circumferential direction is axially connected to the first connecting hole 42e of the pair of first connecting holes 42e located on one side in the circumferential direction. Thus, a pair of first connecting holes 42e arranged adjacent to each other in the circumferential direction are connected via second connecting holes 43a. Furthermore, a pair of second connecting holes 43a arranged adjacent to each other in the circumferential direction are connected via first connecting holes 42e.

[0065] When viewed axially, the multiple stator flow paths 96 overlap with the second connecting holes 43a respectively. More specifically, in this embodiment, when viewed axially, the multiple stator flow paths 96 overlap with different second connecting holes 43a. Thus, each stator flow path 96 is connected to the first inlet hole 41a via the second flow path portion 42a, the first connecting hole 42c, the multiple first connecting holes 42e, and the multiple second connecting holes 43a. In this embodiment, the connecting flow path portion 95 is composed of the first inlet hole 41a, the second flow path portion 42a, the first connecting hole 42c, the multiple first connecting holes 42e, and the multiple second connecting holes 43a. The connecting flow path portion 95 connects the multiple stator flow paths 96 arranged at different positions in the circumferential direction. It should be noted that, as Figure 1 As shown, in this embodiment, the radial distance between the stator flow path 96 and the central axis J is shorter than the radial distance between the first inlet hole 41a and the central axis J.

[0066] like Figure 7As shown, the third flow path member 43 has six fastening holes 43g. The fastening holes 43g are arranged at approximately equal intervals along the circumference. Each fastening hole 43g is located at the radial outer edge of the third flow path member 43. Each fastening hole 43g opens radially outward. When viewed axially, each fastening hole 43g overlaps with two different fastening holes 41g and 42g. The fastening holes 43g constitute... Figure 3 This is a portion of each of the second fastening hole portions 40g shown. As described above, each fastening hole 41g and each fastening hole 42g constitute a portion of each of the second fastening hole portions 40g. That is, each of the second fastening hole portions 40g is composed of fastening holes 41g, 42g, and 43g.

[0067] like Figure 5 As shown, when the fastening member 81 passes through the first fastening hole 31a and the second fastening hole 40g axially, respectively, and the external thread 81b of the fastening member 81 is fastened to the internal thread hole 63g provided in the peripheral wall portion 63c of the housing 63, the stator core 31 and the guide member 40 are pressed against the peripheral wall portion 63c by the head 81a of the fastening member 81. Thus, the stator 30 and the guide member 40 are fixed to the housing 63. According to this embodiment, the stator core 31 and the guide member 40 are fixed to the housing 63 by the fastening member 81, which passes through the first fastening hole 31a and the second fastening hole 40g axially and is fastened to the housing 63. Therefore, the stator 30 and the guide member 40 can be fixed to the housing 63 by the same fastening member 81. Therefore, compared to a configuration where the stator 30 and the guide member 40 are each individually fixed to the housing 63 by different fastening members, the increase in the number of fastening members 81 can be suppressed. Therefore, it can suppress the increase in the number of parts and manufacturing cost of the rotary motor 10 and the drive device 1.

[0068] Furthermore, in this embodiment, as described above, the stator 30 and the guide member 40 can be fixed to the housing 63 using the same fastening member 81. Therefore, the process of fixing the stator 30 and the guide member 40 to the housing 63 during the assembly process of the rotary motor 10 can be simplified. As a result, the increase in manufacturing time for the rotary motor 10 and the drive device 1 can be suppressed.

[0069] Furthermore, in this embodiment, the head 81a of the fastening member 81 presses the stator core 31 against the housing 63 via the guide member 40. This prevents direct contact between the head 81a of the fastening member 81 and the stator core 31, thus reducing the stress applied to the stator core 31 by the head 81a of the fastening member 81. Therefore, even when the stator core 31 is made of, for example, an amorphous metallic material with low fracture strain, damage to the stator core 31 can be suppressed.

[0070] like Figure 7As shown, when viewed axially, the mounting hole 43h is approximately circular. The third flow path member 43 has two mounting holes 43h. Each mounting hole 43h is located on the upper (+Z side) portion of the third flow path member 43. The mounting holes 43h are spaced apart in the front-to-back direction (X-axis direction). When viewed axially, each mounting hole 43h overlaps with two different mounting holes 41h and 42h. Each mounting hole 43h constitutes... Figure 3 This is a portion of the mounting hole portion 40h shown. As described above, each mounting hole 41h and each mounting hole 42h constitute a portion of each mounting hole portion 40h. That is, each mounting hole portion 40h is composed of mounting holes 41h, 42h, and 43h.

[0071] like Figure 1 As shown, the refrigerant flow path 90 is the path for supplying the refrigerant L stored in the gear housing 63b and the motor housing 63a to the stator 30. A pump 97 and a cooler 98 are provided in the refrigerant flow path 90. The refrigerant flow path 90 includes a first flow path section 91, a second flow path section 92, a third flow path section 93, a supply flow path section 94, a connecting flow path section 95, and a stator flow path 96.

[0072] The first flow path 91, the second flow path 92, and the third flow path 93 are provided, for example, in the wall of the motor housing 63a. The first flow path 91 connects the lower region of the gear housing 63b, where the refrigerant L is stored, to the pump 97. The second flow path 92 connects the pump 97 to the cooler 98. The third flow path 93 connects the cooler 98 to the supply flow path 94.

[0073] The supply flow path 94 is a pipe extending axially. The supply flow path 94 connects the third flow path 93 to the connecting flow path 95. The supply flow path 94 is positioned axially closer to the guide member 40. The supply flow path 94 is radially opposed to the coil section 35. The axial end of the supply flow path 94 is supported by the motor housing 63a. The axial end of the supply flow path 94 is connected to the third flow path 93. Figure 3 As shown, a flange 94a is provided at the end of the supply flow path 94 on the other side of the axial direction. The flange 94a is a plate-shaped part that protrudes from both sides of the supply flow path 94 in the front-back direction (X-axis direction). Two through holes 94b are provided in the flange 94a, extending through the flange 94a axially. Each through hole 94b is arranged to sandwich the supply flow path 94 in the front-back direction. When viewed axially, each through hole 94b overlaps with the different mounting holes 40h of the guide member 40. When a screw (not shown) passes through each through hole 94b and is screwed into each mounting hole 40h, the flange 94a is fixed to the guide member 40. Thus, the supply flow path 94 is fixed to the guide member 40. Therefore, as... Figure 4As shown, the end of the supply flow path 94 on the other side of the axial direction is connected to the first inlet hole 41a. That is, the supply flow path 94 is connected to the connecting flow path 95.

[0074] like Figure 9 As shown, the connecting flow path 95 connects the supply flow path 94 to a plurality of stator flow paths 96. As described above, the connecting flow path 95 is composed of a first inlet hole 41a, a second flow path 42a, a first connecting hole 42c, a plurality of first connecting holes 42e, and a plurality of second connecting holes 43a.

[0075] like Figure 1 As shown, multiple stator flow paths 96 extend axially inside the stator core 31. One axial end of each stator flow path 96 is connected to a connecting flow path portion 95. The other axial end of each stator flow path 96 opens inside the motor housing 63a.

[0076] When pump 97 is driven, refrigerant L stored in the lower region of gear housing 63b is drawn into pump 97 through first flow path 91. Refrigerant L discharged from pump 97 flows into cooler 98 through second flow path 92. After being cooled in cooler 98, refrigerant L flows into supply flow path 94 through third flow path 93. Figure 9 As shown, the refrigerant L flowing into the supply flow path 94 is supplied to the connecting flow path 95. That is, the supply flow path 94 supplies refrigerant L to the connecting flow path 95.

[0077] The refrigerant L supplied to the connecting flow path 95 flows into the first connecting hole 42e through the first inlet hole 41a, the second flow path 42a, and the first connecting hole 42c. The refrigerant L flowing into the first connecting hole 42e alternately passes through the second connecting hole 43a and the first connecting hole 42e, and flows towards both sides in the circumferential direction. That is, the guide member 40 supplies the refrigerant L in the circumferential direction. A portion of the refrigerant L flowing towards both sides in the circumferential direction flows into each stator flow path 96. Thus, the refrigerant L flows into each stator flow path 96 located at different positions in the circumferential direction.

[0078] The refrigerant L flowing into each stator flow path 96 absorbs heat from the stator 30 by contacting the inner surface of each stator flow path 96. As a result, the heat generated by iron losses and Joule heating in the coil section 35 is transferred to the refrigerant L, thus cooling the stator 30. Figure 1 As shown, the refrigerant L, which has absorbed heat from the stator 30, flows into the interior of the motor housing 63a from the opening on the other side of the axial direction of each stator flow path 96 and is stored in the lower region of the motor housing 63a.

[0079] In this embodiment, the lower (-Z side) portion of the stator 30 is immersed in refrigerant L stored in the lower region within the motor housing 63a. The lower portion of the stator core 31 and the coil portion 35 attached to the lower portion of the stator core 31 are immersed in refrigerant L. As a result, heat from the lower portion of the stator 30 is transferred to the refrigerant L, thus cooling the lower portion of the stator 30. The refrigerant L stored in the lower region within the motor housing 63a flows into the gear housing 63b through the partition wall opening 63f and is again stored in the lower region within the gear housing 63b.

[0080] According to this embodiment, a plurality of stator flow paths 96 are provided in the stator core 31, extending axially through the stator core 31 and supplying refrigerant L. The plurality of stator flow paths 96 are respectively arranged at different positions in the circumferential direction. The guide member 40 has a connecting flow path portion 95 that connects the plurality of stator flow paths 96, and is composed of a plurality of flow path members 40a stacked axially. Therefore, refrigerant L can be supplied to each stator flow path 96 arranged at different positions in the circumferential direction through the connecting flow path portion 95. Thus, heat from the stator core 31 can be transferred to the refrigerant L flowing in each stator flow path 96, thereby appropriately cooling the stator 30 over a large circumferential range. Therefore, the overall temperature rise of the stator 30 can be suppressed. Therefore, the temperature of a portion of the plurality of coil portions 35 arranged circumferentially can be prevented from becoming too high, thus suppressing the deterioration of the coil portions 35. Therefore, the stability of the operation of the rotary motor 10 and the drive device 1 can be improved.

[0081] Furthermore, in this embodiment, the connecting flow path 95 can be configured using shapes such as holes provided in the plurality of flow path members 40a stacked axially. This increases the shape freedom of the connecting flow path 95 compared to the case where the guide member 40 is a single member, making it easier to configure the shape of the connecting flow path 95 to match the positions of the supply flow path 94 and the stator flow path 96. Consequently, deviations in the flow rate of the refrigerant L flowing in each stator flow path 96 are easily suppressed, thus appropriately suppressing circumferential temperature deviations in the stator core 31. Therefore, the overall temperature rise of the stator 30 can be appropriately suppressed.

[0082] According to this embodiment, the guide member 40 is in axial contact with the stator core 31. Therefore, heat from the stator core 31 can be transferred via the guide member 40 to the refrigerant L flowing in the connecting flow path 95. As a result, the amount of heat transferred from the stator core 31 to the refrigerant L can be increased, thus more appropriately suppressing the temperature rise of the stator 30.

[0083] According to this embodiment, the first flow path member 41, the second flow path member 42, and the third flow path member 43 are all plate-shaped structures extending in a direction orthogonal to the axial direction. The first flow path member 41 has a first inlet hole 41a extending through it axially. The second flow path member 42 has a second flow path portion 42a connected to the first inlet hole 41a and a plurality of first connecting holes 42e. The third flow path member 43 has a plurality of second connecting holes 43a extending through it axially. When viewed axially, at least a portion of the second flow path portion 42a overlaps with at least a portion of the first inlet hole 41a. The plurality of first connecting holes 42e are arranged at intervals along the circumferential direction. At least one first connecting hole 42e is connected to the second flow path portion 42a. The plurality of second connecting holes 43a are arranged at intervals along the circumferential direction and overlap with the first connecting holes 42e when viewed axially. When viewed axially, a plurality of stator flow paths 96 overlap with the second connecting holes 43a. In this embodiment, holes such as the first inlet hole 41a, the second flow path portion 42a, a plurality of first connecting holes 42e, and a plurality of second connecting holes 43a can be fabricated by processing the plate-shaped first flow path member 41, the second flow path member 42, and the third flow path member 43 respectively using a simple processing method such as stamping. Furthermore, a connecting flow path portion 95 capable of supplying refrigerant L to each stator flow path 96 located at different positions in the circumferential direction can be constructed by simply stacking the first flow path member 41, the second flow path member 42, and the third flow path member 43 axially. Therefore, the increase in manufacturing time and cost of the guide member 40 can be suppressed.

[0084] Furthermore, in this embodiment, as described above, the plate-shaped first flow path member 41, second flow path member 42, and third flow path member 43 can be processed by stamping or other processing methods to form the connecting flow path portion 95, thus further increasing the degree of freedom in the shape of the connecting flow path portion 95. Consequently, the shape of the connecting flow path portion 95 can be configured to match the positions of the supply flow path portion 94 and the stator flow path 96, making it easier to more appropriately suppress deviations in the flow rate of refrigerant L flowing in each stator flow path 96. Therefore, circumferential temperature deviations of the stator core 31 can be more appropriately suppressed, and thus, overall temperature rise of the stator 30 can be more appropriately suppressed.

[0085] Furthermore, in this embodiment, the plurality of first connecting holes 42e and the plurality of second connecting holes 43a are holes extending circumferentially. Therefore, in the manufacturing process of the guide member 40, even if the third flow path member 43 is offset circumferentially relative to the second flow path member 42, it is easy to arrange the first connecting holes 42e and the second connecting holes 43a in an axially overlapping configuration. Furthermore, in the assembly process of the rotary motor 10, even if the third flow path member 43 is offset circumferentially relative to the stator core 31, it is easy to arrange the second connecting holes 43a and the stator flow path 96 in an axially overlapping configuration. Thus, refrigerant L can be stably supplied to each stator flow path 96 via the connecting flow path portion 95. Therefore, deviations in the flow rate of refrigerant L flowing in each stator flow path 96 can be more appropriately suppressed, thereby more appropriately suppressing the overall temperature rise of the stator 30.

[0086] Furthermore, in this embodiment, such as Figure 9 As shown, the refrigerant L flows axially and circumferentially between the first connecting hole 42e and the second connecting hole 43a, thus increasing the contact area between the refrigerant L and the inner surface of the connecting flow path 95. This further increases the amount of heat transferred from the stator core 31 to the refrigerant L flowing in the connecting flow path 95 via the guide member 40. Therefore, the heat transferred from the stator core 31 to the refrigerant L is further increased, and the temperature rise of the stator 30 can be more appropriately suppressed.

[0087] According to this embodiment, the radial distance between the stator flow path 96 and the central axis J is shorter than the radial distance between the first inlet hole 41a and the central axis J. Therefore, it is easier to position the first inlet hole 41a radially outward, thus making it easier to extend the radial distance between the first inlet hole 41a and the coil portion 35. Therefore, during the assembly process of the rotary motor 10, when fixing the supply flow path portion 94 to the guide member 40, interference between the supply flow path portion 94 and the coil portion 35 is easily suppressed. Therefore, the operation of fixing the supply flow path portion 94 to the guide member 40 can be simplified, thus more appropriately suppressing the increase in manufacturing time for the rotary motor 10 and the drive device 1.

[0088] Furthermore, in this embodiment, since the stator flow path 96 can be easily positioned radially inside, the distance between the stator flow path 96 and the tooth portion 33 can be easily shortened. Therefore, the heat generated in the coil portion 35 fitted to the tooth portion 33 can be easily transferred to the refrigerant L flowing in the stator flow path 96. Thus, the overall temperature rise of the stator 30 can be more appropriately suppressed.

[0089] According to this embodiment, the central axis J extends in a direction intersecting the vertical direction, and the first inlet hole 41a is positioned vertically upward (+Z side) than the plurality of first connecting holes 42e. Therefore, the refrigerant L flowing in from the first inlet hole 41a can be directed to the first connecting hole 42e by the gravity applied to the refrigerant L. As a result, the flow rate of the refrigerant L flowing in the first connecting hole 42e can be increased, thereby increasing the flow rate of the refrigerant L flowing in each stator flow path 96. Therefore, the heat that can be transferred from the stator core 31 to the refrigerant L can be further increased, thus more appropriately suppressing the temperature rise of the stator 30 as a whole.

[0090] According to this embodiment, the stator core 31 has an annular core back 32 and a plurality of teeth 33 protruding radially from the core back, and a plurality of stator flow paths 96 are provided on the core back 32. In this embodiment, the core back 32 is annular, which makes it easier to increase the number of stator flow paths 96 arranged at different positions in the circumferential direction. Therefore, the circumferential temperature deviation of the stator core 31 can be more appropriately suppressed, and thus the temperature rise of the stator 30 as a whole can be more appropriately suppressed.

[0091] Furthermore, in this embodiment, compared to a configuration where multiple stator flow paths 96 are provided in the tooth portion 33, the obstruction of magnetic flux flow through the interior of the tooth portion 33 can be suppressed. Therefore, the reduction in magnetic force between the stator 30 and the rotor 15 can be suppressed, thereby suppressing the reduction in output torque of the rotary motor 10 and the drive device 1.

[0092] According to this embodiment, the rotary motor 10 includes a supply flow path 94 connected to the connecting flow path 95 and supplying refrigerant L to the connecting flow path 95. The supply flow path 94 is radially opposed to the coil section 35. Therefore, compared to the case where the supply flow path 94 is positioned on the axial side of the coil section 35, it is possible to suppress the axial enlargement of the rotary motor 10 and the drive device 1.

[0093] <Second Implementation>

[0094] Figure 10 This is an exploded perspective view showing the guide member 240 of this embodiment. In the following description, the same reference numerals are used to mark the constituent elements that are the same as those in the first embodiment described above, and their descriptions are omitted.

[0095] like Figure 11 As shown, the guide member 240 of this embodiment has a connecting flow path portion 295 that connects a plurality of stator flow paths 96. The guide member 240 supplies refrigerant L circumferentially. Figure 10 As shown, the guide member 240 has a second fastening hole 240g and a mounting hole 240h. The guide member 240 is composed of a plurality of flow path members 240a stacked in the axial direction.

[0096] The second fastening hole 240g is a hole that passes through the guide member 240 axially. In this embodiment, the guide member 240 has six second fastening holes 240g. Each second fastening hole 240g is composed of fastening holes 41g, 42g, 43g, and fastening hole 244g. The other configurations of the second fastening hole 240g are the same as the other configurations of the second fastening hole 40g in the first embodiment described above.

[0097] Mounting hole 240h is an internally threaded hole that passes through the guide member 240 axially. In this embodiment, the guide member 240 has two mounting holes 240h. Each mounting hole 240h is composed of mounting holes 41h, 42h, 43h, and mounting hole 244h. The other configurations of the mounting hole 240h are the same as those of the mounting hole 40h in the first embodiment described above.

[0098] In this embodiment, the plurality of flow path components 240a include a first flow path component 41, a second flow path component 42, a third flow path component 43, and a fourth flow path component 244. The fourth flow path component 244 is a plate-shaped component extending in a direction orthogonal to the axial direction. The first flow path component 41, the second flow path component 42, the third flow path component 43, and the fourth flow path component 244 are arranged in this order from one axial side. In this embodiment, the first flow path component 41, the second flow path component 42, the third flow path component 43, and the fourth flow path component 244 are respectively fixed to each other by adhesive.

[0099] In this embodiment, the fourth flow path component 244 is a roughly annular plate centered on the central axis J. For example... Figure 11 As shown, the fourth flow path member 244 is disposed between the third flow path member 43 and the stator core 31. The side of the fourth flow path member 244 facing the opposite axial direction is fixed to the stator core 31 by adhesive. The fourth flow path member 244 is in contact with the stator core 31. Figure 10 As shown, the fourth flow path component 244 has multiple outflow holes 244a, fastening holes 244g, and mounting holes 244h. The multiple outflow holes 244a, fastening holes 244g, and mounting holes 244h are holes that penetrate the fourth flow path component 244 axially.

[0100] The plurality of outflow holes 244a are elongated holes extending circumferentially. In this embodiment, the fourth flow path member 244 has twenty-four outflow holes 244a. The plurality of outflow holes 244a are arranged at approximately equal intervals along the circumferential direction. Figure 11As shown, when viewed axially, the multiple outflow holes 244a overlap with the second connecting holes 43a respectively. More specifically, when viewed axially, each outflow hole 244a overlaps with a different second connecting hole 43a. Furthermore, when viewed axially, each outflow hole 244a overlaps with a stator flow path 96. More specifically, when viewed axially, each outflow hole 244a overlaps with a different stator flow path 96. In this embodiment, the connecting flow path portion 295 is composed of a first inflow hole 41a, a second flow path portion 42a, a first connecting hole 42c, multiple first connecting holes 42e, multiple second connecting holes 43a, and multiple outflow holes 244a. The connecting flow path portion 295 connects multiple stator flow paths 96 arranged at different positions in the circumferential direction. The other configurations of the connecting flow path portion 295 are the same as those of the connecting flow path portion 95 in the first embodiment described above.

[0101] like Figure 10 As shown, the fourth flow path member 244 has six fastening holes 244g. The fastening holes 244g are arranged at approximately equal intervals along the circumference. Each fastening hole 244g is located at the radial outer edge of the fourth flow path member 244. Each fastening hole 244g opens radially outward. When viewed axially, each fastening hole 244g overlaps with mutually different fastening holes 41g, 42g, and 43g. Each fastening hole 244g forms part of each second fastening hole portion 240g.

[0102] Viewed axially, the mounting hole 244h is a generally circular hole. The fourth flow path member 244 has two mounting holes 244h. Each mounting hole 244h is located on the upper (+Z side) portion of the fourth flow path member 244. The mounting holes 244h are spaced apart in the front-to-back direction (X-axis direction). Viewed axially, each mounting hole 244h overlaps with mutually different mounting holes 41h, 42h, and 43h. Each mounting hole 244h constitutes a part of the mounting hole portion 240h. The other configurations of the guide member 240 are the same as those of the guide member 40 in the first embodiment described above. Furthermore, the other configurations of the rotary motor 210 and the drive device 201 are the same as those of the rotary motor 10 and the drive device 1 in the first embodiment described above.

[0103] According to this embodiment, the plurality of flow path members 240a includes a plate-shaped fourth flow path member 244 extending in a direction orthogonal to the axial direction. The fourth flow path member 244 is disposed between the third flow path member 43 and the stator core 31. The fourth flow path member 244 has a plurality of outflow holes 244a extending through the fourth flow path member 244 axially. The plurality of outflow holes 244a are arranged at intervals along the circumferential direction and overlap with the second connecting hole 43a and the stator flow path 96 when viewed from the axial direction. Therefore, the refrigerant L flowing in the connecting flow path portion 295 can be guided to the stator flow path 96 through the outflow holes 244a. As a result, the refrigerant L can be stably supplied to each stator flow path 96 disposed at different positions in the circumferential direction, and thus the stator 30 can be appropriately cooled over a large range across the circumferential direction. Therefore, the temperature rise of the stator 30 as a whole can be more appropriately suppressed.

[0104] Furthermore, in this embodiment, the plate-shaped fourth flow path member 244 can be machined using a simple processing method such as stamping to create multiple outflow holes 244a and other holes. Moreover, the connecting flow path portion 295 can be constructed by a simple operation of stacking the first flow path member 41, the second flow path member 42, the third flow path member 43, and the fourth flow path member 244 axially. Therefore, the increase in manufacturing time and cost of the guide member 240 can be suppressed.

[0105] <Third Implementation Method>

[0106] Figure 12 This is an exploded perspective view showing the guide member 340 of this embodiment. In the following description, the same reference numerals are used to mark the constituent elements that are the same as those in the first embodiment described above, and their descriptions are omitted.

[0107] like Figure 13 As shown, the guide member 340 of this embodiment has a connecting flow path portion 395 that connects a plurality of stator flow paths 96. The guide member 340 supplies refrigerant L in the circumferential direction. Figure 12 As shown, the guide member 340 has a second fastening hole 340g and a mounting hole 340h. The guide member 340 is composed of a plurality of flow path members 340a stacked in the axial direction.

[0108] The second fastening hole 340g is a hole that passes through the guide member 340 axially. In this embodiment, the guide member 340 has six second fastening holes 340g. Each second fastening hole 340g is composed of fastening holes 41g and 42g. The other configurations of the second fastening hole 340g are the same as those of the second fastening hole 40g in the first embodiment described above.

[0109] Mounting hole 340h is an internally threaded hole that passes through guide member 340 axially. In this embodiment, guide member 340 has two mounting holes 340h. Each mounting hole 340h is composed of mounting holes 41h and 42h. The other configurations of mounting hole 340h are the same as those of mounting hole 40h in the first embodiment described above.

[0110] In this embodiment, the plurality of flow path components 340a include a first flow path component 341 and a second flow path component 342. The first flow path component 341 and the second flow path component 342 are plate-shaped components extending in a direction orthogonal to the axial direction. The first flow path component 341 and the second flow path component 342 are arranged in this order from one axial side. In this embodiment, the first flow path component 341 and the second flow path component 342 are fixed to each other by an adhesive.

[0111] In this embodiment, the first flow path component 341 is a generally annular plate centered on the central axis J. The first flow path component 341 has a first inflow hole 341a, a fastening hole 41g, and a mounting hole 41h. The first inflow hole 341a, the fastening hole 41g, and the mounting hole 41h are holes that pass through the first flow path component 341 axially.

[0112] The first inflow hole 341a is provided on the upper side (+Z side) of the first flow path member 341. In this embodiment, the first inflow hole 341a is an elongated hole extending in the front-back direction (X-axis direction). The other configurations of the first flow path member 341 are the same as the other configurations of the first flow path member 41 in the first embodiment described above.

[0113] In this embodiment, the second flow path component 342 is in the shape of a roughly annular plate centered on the central axis J. For example... Figure 13 As shown, the second flow path member 342 is disposed between the first flow path member 341 and the stator core 31. The side of the second flow path member 342 facing the opposite axial direction is fixed to the stator core 31 by adhesive. The second flow path member 342 is in contact with the stator core 31. Figure 12 As shown, the second flow path component 342 has two second flow path portions 342a and 342b, two first connecting holes 342c and 342d, two first connecting holes 342e and 342f, a fastening hole 42g, and a mounting hole 42h. The second flow path portions 342a and 342b, the first connecting holes 342c and 342d, the first connecting holes 342e and 342f, the fastening hole 42g, and the mounting hole 42h are holes that axially penetrate the second flow path component 342.

[0114] Each second flow path portion 342a, 342b is provided on the upper side (+Z side) of the second flow path member 342. Each second flow path portion 342a, 342b is a circular hole. The second flow path portions 342a, 342b may also be holes recessed from one axial side facing the second flow path member 342 to the other axial side. Each second flow path portion 342a, 342b is arranged at intervals in the front-rear direction (X-axis direction). The second flow path portion 342a is positioned forward (+X side) than the second flow path portion 342b. In the front-rear direction, each second flow path portion 342a, 342b is arranged between two mounting holes 41h. When viewed axially, at least a portion of each second flow path portion 342a, 342b overlaps with at least a portion of the first inflow hole 341a. Thus, each second flow path portion 342a, 342b is axially connected to the first inflow hole 341a.

[0115] The first connecting hole 342c is a hole extending downward (towards the -Z side) from the second flow path portion 342a. The first connecting hole 342d is a hole extending downward (towards the -Z side) from the second flow path portion 342b. The two first connecting holes 342e and 342f are holes extending circumferentially. The end of one first connecting hole 342e on the other circumferential side (towards the -θ side) is connected to the second flow path portion 342a via the first connecting hole 342c. The end of the other first connecting hole 342f on one circumferential side (towards the +θ side) is connected to the second flow path portion 342b via the first connecting hole 342d. That is, the two first connecting holes 342e and 342f are connected to the second flow path portions 342a and 342b, respectively.

[0116] One first connecting hole 342e extends from the second flow path 342a circumferentially to one side (+θ side). The other first connecting hole 342f extends from the second flow path 342b circumferentially to the other side (-θ side). The end of the other first connecting hole 342f on the other side circumferentially and the end of the first first connecting hole 342e on one side circumferentially are spaced apart in the front-back direction (X-axis direction). Figure 13As shown, when viewed axially, one first connecting hole 342e overlaps with two or more stator flow paths 96. Although not shown in the figure, in this embodiment, when viewed axially, one first connecting hole 342e overlaps with twelve stator flow paths 96. The other first connecting hole 342f overlaps with two or more stator flow paths 96 when viewed axially. Although not shown in the figure, in this embodiment, when viewed axially, the other first connecting hole 342f overlaps with twelve stator flow paths 96. Therefore, all stator flow paths 96 overlap axially with either one of the first connecting holes 342e or the other first connecting hole 342f. In this embodiment, the connecting flow path portion 395 is composed of a first inlet hole 341a, second flow path portions 342a, 342b, first connecting holes 342c, 342d, and first connecting holes 342e, 342f. The connecting flow path portion 395 connects multiple stator flow paths 96 arranged at different positions in the circumferential direction. The other configurations of the connecting flow path portion 395 are the same as those of the connecting flow path portion 95 in the first embodiment described above. The other configurations of the second flow path member 342 are the same as those of the second flow path member 42 in the first embodiment described above. The other configurations of the guide member 340 are the same as those of the guide member 40 in the first embodiment described above. Furthermore, the other configurations of the rotary motor 310 and the drive device 301 are the same as those of the rotary motor 10 and the drive device 1 in the first embodiment described above.

[0117] According to this embodiment, the first flow path member 341 and the second flow path member 342 are both plate-shaped extending in a direction orthogonal to the axial direction. The first flow path member 341 has a first inlet hole 341a extending through the first flow path member 341 axially. The second flow path member 342 has: second flow path portions 342a and 342b connected to the first inlet hole 341a; and two first connecting holes 342e and 342f. When viewed axially, at least a portion of the second flow path portions 342a and 342b overlaps with at least a portion of the first inlet hole 341a. The two first connecting holes 342e and 342f are connected to the second flow path portions 342a and 342b, respectively. One of the first connecting holes 342e extends from the second flow path portion 342a to one circumferential side (+θ side) and overlaps with two or more stator flow paths 96 when viewed axially. The first connecting hole 342f extends circumferentially from the second flow path portion 342b to the other side (-θ side) and overlaps with two or more stator flow paths 96 when viewed axially. Therefore, a connecting flow path portion 395 for supplying refrigerant L to each stator flow path 96 located at different positions in the circumferential direction can be formed by the two flow path members 340a. This suppresses the increase in the number of parts in the guide member 340. Therefore, it suppresses the increase in manufacturing time and manufacturing cost of the guide member 340.

[0118] Furthermore, in this embodiment, by connecting the flow path section 395, refrigerant L can be supplied to each stator flow path 96 located at different positions in the circumferential direction, thus enabling appropriate cooling of the stator 30 over a large circumferential range. Therefore, the overall temperature rise of the stator 30 can be suppressed.

[0119] Furthermore, in this embodiment, the plate-shaped first flow path member 341 and the second flow path member 342 can be machined using simple processing methods such as stamping to create holes such as the first inlet hole 341a and two first connecting holes 342e and 342f. Moreover, the connecting flow path portion 395 can be constructed by a simple operation of stacking the first flow path member 341 and the second flow path member 342 axially. Therefore, the increase in manufacturing time and cost of the guide member 340 can be suppressed.

[0120] <Fourth Implementation>

[0121] Figure 15 This is an exploded perspective view showing the guide member 440 of this embodiment. In the following description, the same reference numerals are used to mark the constituent elements of the same scheme as those in the first embodiment described above, and their descriptions are omitted.

[0122] like Figure 14 As shown, the stator 430 of this embodiment has a plurality of stator flow paths 496 in its stator core 431. Each stator flow path 496 is a hole that penetrates the stator core 431 axially. When viewed axially, each stator flow path 496 is an elongated hole extending circumferentially. When viewed axially, the shape of each stator flow path 496 can also be other shapes such as circular or rectangular. Refrigerant L flows inside each stator flow path 496. In this embodiment, eight stator flow paths 496 are provided in the stator core 431. The number of stator flow paths 496 provided in the stator core 431 can be seven or less, or nine or more. Each stator flow path 496 is arranged at intervals along the circumferential direction. That is, the plurality of stator flow paths 496 are respectively arranged at different positions in the circumferential direction. In this embodiment, the plurality of stator flow paths 496 are respectively provided in a plurality of teeth 33.

[0123] like Figure 15As shown, the guide member 440 of this embodiment has a connecting flow path portion 495 that connects a plurality of stator flow paths 496. The guide member 440 supplies refrigerant L circumferentially. The guide member 440 is composed of a plurality of flow path members 440a stacked axially. In this embodiment, the plurality of flow path members 440a includes a first flow path member 441, a second flow path member 442, and a third flow path member 443. The first flow path member 441, the second flow path member 442, and the third flow path member 443 are arranged in this order from one axial side. The first flow path member 441, the second flow path member 442, and the third flow path member 443 are respectively fixed to each other by adhesive.

[0124] In this embodiment, the first flow path member 441 is provided with a plurality of protrusions 441i. Each protrusion 441i protrudes radially inward from the first flow path member 441. The first flow path member 441 is provided with eight protrusions 441i. The protrusions 441i are arranged at approximately equal intervals along the circumferential direction. Although not shown in the figure, when viewed axially, each protrusion 441i overlaps with mutually different teeth 33 and mutually different stator flow paths 496. The other configurations of the first flow path member 441 are the same as those of the first flow path member 41 in the first embodiment described above.

[0125] In this embodiment, the second flow path member 442 is provided with a plurality of protrusions 442i. Each protrusion 442i protrudes radially inward from the second flow path member 442. There are eight protrusions 442i in the second flow path member 442. The protrusions 442i are arranged at approximately equal intervals along the circumferential direction. Although not shown in the figure, when viewed axially, each protrusion 442i overlaps with different tooth portions 33 and different stator flow paths 496. The other configurations of the second flow path member 442 are the same as those of the second flow path member 42 in the first embodiment described above.

[0126] In this embodiment, the third flow path component 443 has a plurality of third connecting holes 443c and a plurality of outflow holes 443e. The third flow path component 443 is provided with a plurality of protrusions 443i. The plurality of third connecting holes 443c and the plurality of outflow holes 443e are holes that axially penetrate the third flow path component 443.

[0127] Each protrusion 443i protrudes radially inward from the third flow path member 443. Eight protrusions 443i are provided in the third flow path member 443. The protrusions 443i are arranged at approximately equal intervals along the circumferential direction. Although not shown in the figure, when viewed axially, each protrusion 443i overlaps with different tooth portions 33 and different stator flow paths 496.

[0128] The plurality of third connecting holes 443c are radially extending holes. In this embodiment, the third flow path member 443 has eight third connecting holes 443c. Each third connecting hole 443c is arranged at approximately equal intervals along the circumference. The radially outer end of each third connecting hole 443c connects to a different second connecting hole 43a. The radially inner end of each third connecting hole 443c reaches a different protrusion 443i.

[0129] The multiple outflow holes 443e are elongated holes extending circumferentially. In this embodiment, the third flow path member 443 has eight outflow holes 443e. Each outflow hole 443e is arranged at approximately the same interval along the circumferential direction. Each outflow hole 443e is provided at a different protrusion 443i. Although not shown in the figure, when viewed axially, each outflow hole 443e overlaps with a different stator flow path 496. That is, when viewed axially, each stator flow path 496 overlaps with a different outflow hole 443e. In this embodiment, the connecting flow path portion 495 is composed of a first inflow hole 41a, a second flow path portion 42a, a first connecting hole 42c, a plurality of first connecting holes 42e, a plurality of second connecting holes 43a, a plurality of third connecting holes 443c, and a plurality of outflow holes 443e. The connecting flow path portion 495 connects the plurality of stator flow paths 496 arranged at different positions in the circumferential direction. The other configurations of the third flow path member 443 are the same as those of the third flow path member 43 in the first embodiment described above. The other configurations of the guide member 440 are the same as those of the guide member 40 in the first embodiment described above. Furthermore, the other configurations of the rotary motor 410 and the drive device 401 are the same as those of the rotary motor 10 and the drive device 1 in the first embodiment described above.

[0130] According to this embodiment, multiple stator flow paths 496 are respectively provided on multiple tooth portions 33. As described above, a coil portion 35 is mounted on each tooth portion 33. Furthermore, if current is supplied to each coil portion 35, heat is generated in each coil portion 35. In contrast, in this embodiment, since each stator flow path 496 can be arranged near each coil portion 35, the thermal resistance between each coil portion 35 and the stator flow path 496 can be reduced. As a result, the heat transferred from each coil portion 35 to the refrigerant L flowing in the stator flow path 496 can be increased. Therefore, the temperature rise of the stator 430 as a whole can be suppressed.

[0131] This invention is not limited to the embodiments described above. Other configurations and methods can be employed within the scope of the technical concept of this invention. The shape and configuration of the connecting flow path are not limited to this embodiment. Other shapes and configurations are also possible as long as refrigerant can be supplied to multiple stator flow paths arranged at different positions in the circumferential direction. Furthermore, the number of flow path members constituting the guide member can be five or more.

[0132] The configuration of the refrigerant flow path is not limited to this embodiment. As long as the stator can be cooled by the refrigerant circulating in the drive unit, it can be any configuration.

[0133] The rotary motor using this invention is not limited to a motor, but can also be a generator. The application of the rotary motor is not particularly limited. The rotary motor can also be mounted on equipment other than vehicles. The application of the drive device using this invention is not particularly limited. The drive device can be mounted on a vehicle for purposes other than rotating an axle, or it can be mounted on equipment other than vehicles. The orientation of the rotary motor and drive device when using them is not particularly limited. The central axis can be inclined relative to a horizontal direction orthogonal to the vertical direction, or it can extend along the vertical direction.

[0134] The embodiments of the present invention have been described above. However, the various components and combinations thereof in the embodiments are merely examples, and additions, omissions, substitutions, and other modifications to the components can be made without departing from the spirit of the present invention. Furthermore, the present invention is not limited to the embodiments.

[0135] It should be noted that this technology can be configured as described below.

[0136] (1) A rotary electric motor, comprising: The rotor can rotate about its central axis. The stator has a stator core that is radially opposed to the rotor by a gap; and A guide member, positioned on one axial side of the stator core, supplies refrigerant circumferentially. The stator core is provided with multiple stator flow paths, which axially penetrate the stator core and supply refrigerant flow. The multiple stator flow paths are respectively arranged at different positions in the circumferential direction. The guide member has a connecting flow path portion that connects the plurality of stator flow paths, and is composed of a plurality of flow path members stacked in the axial direction.

[0137] (2) The rotary motor according to (1), wherein, The guide member is in axial contact with the stator core.

[0138] (3) The rotary motor according to (2), wherein, The plurality of flow path components include a first flow path component, a second flow path component, and a third flow path component. The first flow path component, the second flow path component, and the third flow path component are all plate-shaped components that extend in a direction orthogonal to the axial direction. The second flow path component is positioned on the opposite side of the axial direction compared to the first flow path component. The third flow path component is disposed between the second flow path component and the stator core. The first flow path component has a first inlet hole that extends axially through the first flow path component. The second flow path component has a second flow path portion connected to the first inflow hole and a plurality of first connection holes. The third flow path component has a plurality of second connecting holes that extend through the third flow path component along the axial direction. When viewed from the axial direction, at least a portion of the second flow path overlaps with at least a portion of the first inlet hole. The plurality of the first connecting holes are respectively arranged at intervals along the circumferential direction. At least one of the first connecting holes is connected to the second flow path section. The plurality of second connecting holes are respectively arranged at intervals along the circumferential direction and overlap with the first connecting holes when viewed from the axial direction. When viewed from the axial direction, the multiple stator flow paths overlap with the second connecting hole.

[0139] (4) The rotary motor according to (3), wherein, The plurality of flow path components include a plate-shaped fourth flow path component extending in a direction orthogonal to the axial direction. The fourth flow path component is disposed between the third flow path component and the stator core. The fourth flow path component has multiple outflow holes that extend axially through the fourth flow path component. The plurality of outflow holes are arranged circumferentially spaced apart and overlap with the second connection hole and the stator flow path when viewed from the axial direction.

[0140] (5) The rotary motor according to (2), wherein, The plurality of flow path components include a first flow path component and a second flow path component. The first flow path component and the second flow path component are plate-shaped structures that extend in a direction orthogonal to the axial direction. The second flow path component is disposed between the first flow path component and the stator core. The first flow path component has a first inlet hole that extends axially through the first flow path component. The second flow path component has a second flow path portion connected to the first inlet hole and two first connecting holes. When viewed from the axial direction, at least a portion of the second flow path overlaps with at least a portion of the first inlet hole. The two first connecting holes are respectively connected to the second flow path section. The first connecting hole of one side extends circumferentially from the second flow path portion and overlaps with two or more of the stator flow paths when viewed axially. The first connection hole on the other side extends circumferentially from the second flow path portion to the other side and overlaps with two or more of the stator flow paths when viewed from the axial direction.

[0141] (6) The rotary electric motor according to any one of (3) to (5), wherein, The radial distance between the stator flow path and the central axis is shorter than the radial distance between the first inlet hole and the central axis.

[0142] (7) The rotary electric motor according to any one of (3) to (6), wherein, The central axis extends in a direction intersecting the vertical direction. The first inlet hole is positioned vertically above the plurality of first connection holes.

[0143] (8) The rotary electric motor according to any one of (1) to (7), wherein, The stator core has an annular core back and multiple teeth protruding radially from the core back. Multiple stator flow paths are located on the back of the iron core.

[0144] (9) The rotary electric motor according to any one of (1) to (7), wherein, The stator core has an annular core back and multiple teeth protruding radially from the core back. The stator flow paths are respectively located in the tooth section.

[0145] (10) The rotary electric motor according to (8) or (9), wherein, The stator has a coil portion that is fitted onto the teeth. The guide member is radially opposed to the coil portion.

[0146] (11) The rotary electric motor according to (10), wherein, It includes a supply flow path section connected to the connecting flow path section, which supplies the refrigerant to the connecting flow path section. The supply flow path section and the coil section are radially opposite each other.

[0147] (12) The rotary electric machine according to any one of (1) to (11), wherein, It has a housing that accommodates the rotor, the stator, and the guide members. The stator core has a first fastening hole that extends axially through the stator core. The guide member has a second fastening hole that extends axially through the guide member. When viewed from the axial direction, the second fastening hole overlaps with the first fastening hole. The stator core and the guide member are fixed to the housing by fastening members that pass through the first fastening hole and the second fastening hole respectively along the axial direction.

[0148] (13) A driving device comprising: A rotary electric motor according to any one of (1) to (12); and A gear mechanism is connected to the rotor.

[0149] Explanation of reference numerals in the attached figures

[0150] 1, 201, 301, 401: Drive unit; 10, 210, 310, 410: Rotary motor; 15: Rotor; 30, 430: Stator; 31, 431: Stator core; 31a: First fastening hole; 32: Back of core; 33: Tooth; 35: Coil; 40, 240, 340, 440: Guide member; 40a, 240a, 340a, 440a: Flow path member; 40g: Second fastening hole; 41, 341, 441: First flow path member; 41a, 341a: First... Inlet hole; 42, 342, 442: Second flow path component; 42a, 342a, 342b: Second flow path section; 42e, 342e, 342f: First connecting hole; 43, 443: Third flow path component; 43a: Second connecting hole; 63: Housing; 70: Gear mechanism; 81: Fastening component; 94: Supply flow path section; 95, 295, 395, 495: Connecting flow path section; 96, 496: Stator flow path; 244: Fourth flow path component; 244a: Outlet hole; J: Central axis; L: Refrigerant.

Claims

1. A rotary electric motor, comprising: The rotor can rotate around its central axis. The stator has a stator core that is radially opposed to the rotor by a gap; and A guide member, positioned on one axial side of the stator core, supplies refrigerant circumferentially. The stator core is provided with multiple stator flow paths, which axially penetrate the stator core and supply refrigerant flow. The multiple stator flow paths are respectively arranged at different positions in the circumferential direction. The guide member has a connecting flow path portion that connects the plurality of stator flow paths, and is composed of a plurality of flow path members stacked in the axial direction.

2. The rotary motor according to claim 1, wherein, The guide member is in axial contact with the stator core.

3. The rotary motor according to claim 2, wherein, The plurality of flow path components include a first flow path component, a second flow path component, and a third flow path component. The first flow path component, the second flow path component, and the third flow path component are all plate-shaped components that extend in a direction orthogonal to the axial direction. The second flow path component is positioned on the opposite side of the axial direction compared to the first flow path component. The third flow path component is disposed between the second flow path component and the stator core. The first flow path component has a first inlet hole that extends axially through the first flow path component. The second flow path component has a second flow path portion connected to the first inflow hole and a plurality of first connection holes. The third flow path component has a plurality of second connecting holes that extend through the third flow path component along the axial direction. When viewed from the axial direction, at least a portion of the second flow path overlaps with at least a portion of the first inlet hole. The plurality of the first connecting holes are respectively arranged at intervals along the circumferential direction. At least one of the first connecting holes is connected to the second flow path section. The plurality of second connecting holes are respectively arranged at intervals along the circumferential direction and overlap with the first connecting holes when viewed from the axial direction. When viewed from the axial direction, the multiple stator flow paths overlap with the second connecting hole.

4. The rotary motor according to claim 3, wherein, The plurality of flow path components include a plate-shaped fourth flow path component extending in a direction orthogonal to the axial direction. The fourth flow path component is disposed between the third flow path component and the stator core. The fourth flow path component has multiple outflow holes that extend axially through the fourth flow path component. The plurality of outflow holes are arranged circumferentially spaced apart and overlap with the second connection hole and the stator flow path when viewed from the axial direction.

5. The rotary motor according to claim 2, wherein, The plurality of flow path components include a first flow path component and a second flow path component. The first flow path component and the second flow path component are plate-shaped structures that extend in a direction orthogonal to the axial direction. The second flow path component is disposed between the first flow path component and the stator core. The first flow path component has a first inlet hole that extends axially through the first flow path component. The second flow path component has a second flow path portion connected to the first inlet hole and two first connecting holes. When viewed from the axial direction, at least a portion of the second flow path overlaps with at least a portion of the first inlet hole. The two first connecting holes are respectively connected to the second flow path section. The first connecting hole of one side extends circumferentially from the second flow path portion and overlaps with two or more of the stator flow paths when viewed axially. The first connection hole on the other side extends circumferentially from the second flow path portion to the other side and overlaps with two or more of the stator flow paths when viewed from the axial direction.

6. The rotary electric motor according to any one of claims 3 to 5, wherein, The radial distance between the stator flow path and the central axis is shorter than the radial distance between the first inlet hole and the central axis.

7. The rotary electric motor according to any one of claims 3 to 5, wherein, The central axis extends in a direction intersecting the vertical direction. The first inlet hole is positioned vertically above the plurality of first connection holes.

8. The rotary electric motor according to any one of claims 1 to 5, wherein, The stator core has an annular core back and multiple teeth protruding radially from the core back. Multiple stator flow paths are located on the back of the iron core.

9. The rotary electric motor according to any one of claims 1 to 5, wherein, The stator core has an annular core back and multiple teeth protruding radially from the core back. The stator flow paths are respectively located in the tooth section.

10. The rotary electric motor according to claim 8, wherein, The stator has a coil portion that is fitted onto the teeth. The guide member is radially opposed to the coil portion.

11. The rotary electric motor according to claim 10, wherein, It includes a supply flow path section connected to the connecting flow path section, which supplies the refrigerant to the connecting flow path section. The supply flow path section and the coil section are radially opposite each other.

12. The rotary electric motor according to any one of claims 1 to 5, wherein, It has a housing that accommodates the rotor, the stator, and the guide members. The stator core has a first fastening hole that extends axially through the stator core. The guide member has a second fastening hole that extends axially through the guide member. When viewed from the axial direction, the second fastening hole overlaps with the first fastening hole. The stator core and the guide member are fixed to the housing by fastening members that pass through the first fastening hole and the second fastening hole respectively along the axial direction.

13. A driving device comprising: Rotary electric motor according to any one of claims 1 to 5; and A gear mechanism is connected to the rotor.

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