Rotating electric machine

Abstract

A case (3) that accommodates a stator (1) and a rotor (2) comprises: a cylindrical inner case portion (31) having a fitting portion (311) that fits with a stator outer circumferential surface (11a); and a cylindrical outer case portion (32) disposed to cover an inner-case outer peripheral surface (31a). A cooling water passage (4) through which cooling water flows is formed between the inner-case outer circumferential surface (31a) and an outer-case inner circumferential surface (32a). The inner case portion (31) further comprises an axially protruding portion (312) that protrudes from the fitting portion (311) in an axial direction (L), and is disposed to cover at least an upper side of a coil end portion (13). The axially protruding portion (312) has, at a location facing the coil end portion (13) from above, a supply hole (5) for supplying oil toward the coil end portion (13), and the outer case portion (32) has an oil supply passage (6) for supplying the oil to the supply hole (5).

Description

Technical Field

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[0003]

[0001] The present invention relates to a rotating electric machine including a cylindrical stator core, a stator including a coil wound around the stator core, a rotor rotatably provided inside the stator in the radial direction, and a case housing them.

Background Art

[0002] An example of such a rotating electric machine is disclosed in Patent Document 1 below. In the following description of the background art, the reference numerals in Patent Document 1 are cited in parentheses.

[0003] In the rotating electric machine (3) of Patent Document 1, the coil (12b) is wound around the stator core (12a) so as to form a coil end portion (14) protruding axially outward from the stator core (12a). An oil passage for supplying cooling oil to the coil end portion (14) is provided in the case housing the stator (12) and the rotor (11).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in the rotating electric machine (3) of Patent Document 1, the case includes a center housing (10) formed in a cylindrical shape covering the outside in the radial direction of the stator (12), and a side housing (30) joined to the center housing from one side in the axial direction. A groove portion (17) is formed on the surface of the center housing (10) facing the side housing (30), and the oil passage is formed by covering the groove portion with the side housing (30).

[0006] In this configuration, an oil passage is formed at the joint between the center housing (10) and the side housing (30), which tends to make the oil passage configuration complex. Also, because a large radial dimension is required at the joint between the center housing (10) and the side housing (30) in order to seal the oil passage, the case tends to become large.

[0007] Therefore, there is a need to realize a rotating electric machine that can simplify the configuration of the oil passages for supplying oil to the coil ends while suppressing an increase in the size of the case. [Means for solving the problem]

[0008] In light of the above, the characteristic configuration of a rotating electric machine is: A stator comprising a cylindrical stator core and a coil wound around the stator core, A rotor is rotatably mounted radially inward from the stator, A rotating electric machine comprising a case housing the stator and the rotor, The coil has a coil end portion that protrudes axially outward from the stator core, The case comprises a cylindrical inner case portion having a fitting portion that fits onto the outer circumferential surface of the stator core, and a cylindrical outer case portion arranged to cover the outer circumferential surface of the inner case portion. A cooling water channel is formed between the outer circumferential surface of the inner case portion and the inner circumferential surface of the outer case portion, through which cooling water flows. The inner case portion further comprises an axial projection that protrudes from the fitting portion in the axial direction and is arranged to cover at least the upper side of the coil end portion. A supply hole for supplying oil toward the coil end is provided at a position in the axial projection facing the coil end from above. The key feature is that the outer case portion is provided with an oil supply passage for supplying oil to the supply hole.

[0009] According to this characteristic configuration, an axial projection is provided on the inner case portion that protrudes axially from a fitting portion that fits onto the outer circumferential surface of the stator core, and a supply hole is provided on the axial projection portion at a position facing the coil end portion from above, for supplying oil toward the coil end portion. Furthermore, an oil supply passage is provided on the outer case portion, which is arranged to cover the outer circumferential surface of the inner case portion, for supplying oil to the supply hole. This allows for proper supply of oil toward the coil end portion, and also simplifies the configuration of the oil passage, that is, the configuration of the supply hole provided on the axial projection portion of the inner case portion and the oil supply passage provided on the outer case portion. Therefore, it is possible to simplify the configuration of the oil passage for supplying oil to the coil end portion while suppressing an increase in the size of the case. [Brief explanation of the drawing]

[0010] [Figure 1] Cross-sectional view of a rotating electric machine according to an embodiment. [Figure 2] Perspective view of the inner casing of a rotating electric machine according to an embodiment. [Figure 3] Perspective view of the inner casing of a rotating electric machine according to another embodiment. [Figure 4] Cross-sectional view of a vehicle drive system equipped with a rotating electric machine according to an embodiment. [Figure 5] Cross-sectional view showing the flow of oil in a vehicle drive system. [Figure 6] Cross-sectional view showing the flow of oil in a vehicle drive system. [Figure 7] Cross-sectional view showing the flow of oil in a vehicle drive system. [Modes for carrying out the invention]

[0011] In the following description, the rotating electric machine 100 according to this embodiment will be explained with reference to the drawings. The rotating electric machine 100 according to this embodiment is used as a power source for vehicles such as hybrid vehicles and electric vehicles.

[0012] As shown in FIG. 1, the rotating electric machine 100 includes a stator 1, a rotor 2 provided rotatably with respect to the stator 1, and a case 3 that houses the stator 1 and the rotor 2. In the present embodiment, the rotating electric machine 100 further includes a rotor shaft 22 that rotates integrally with the rotor 2.

[0013] In the following description, the direction along the rotation axis center (refer to the dashed line in FIG. 1) of the rotor 2 is defined as the "axial direction L". One side of the axial direction L is defined as the "first axial side L1", and the other side of the axial direction L is defined as the "second axial side L2". Further, the direction orthogonal to the rotation axis center of the rotor 2 is defined as the "radial direction R". In the radial direction R, the side closer to the rotation axis center of the rotor 2 is defined as the "radial inner side R1", and the opposite side is defined as the "radial outer side R2". Further, the direction that circulates around the rotation axis center of the rotor 2 is defined as the "circumferential direction C".

[0014] The stator 1 includes a cylindrical stator core 11 and a coil 12 wound around the stator core 11. The stator core 11 is fixed to a non-rotating member (here, the case 3). The coil 12 includes a coil end portion 13 that protrudes outward in the axial direction L from the stator core 11. In the present embodiment, the coil end portion 13 includes a first coil end portion 14 that protrudes from the stator core 11 to the first axial side L1 and a second coil end portion 15 that protrudes from the stator core 11 to the second axial side L2.

[0015] The rotor 2 is disposed on the radially inner side R1 with respect to the stator 1. The rotor 2 includes a cylindrical rotor core 21. In the present embodiment, the rotor core 21 is connected so as to rotate integrally with a rotor shaft 22 that extends along the axial direction L. The rotor shaft 22 is disposed on the radially inner side R1 with respect to the rotor core 21 so as to penetrate the rotor core 21 in the axial direction L. Although not shown, permanent magnets are provided on the rotor core 21.

[0016] Case 3 includes an inner case part 31 and an outer case part 32. Each of the inner case part 31 and the outer case part 32 is formed in a cylindrical shape. The outer case part 32 is arranged radially outward R2 with respect to the inner case part 31. In this example, the outer case part 32 is integrally formed with a gear mechanism housing case that houses the gear mechanism constituting the above-described vehicle drive device.

[0017] The inner case part 31 and the outer case part 32 are arranged such that an inner case outer peripheral surface 31a, which is the outer peripheral surface of the inner case part 31, and an outer case inner peripheral surface 32a, which is the inner peripheral surface of the outer case part 32, contact each other. Thus, the outer case part 32 is arranged to cover the inner case outer peripheral surface 31a. In the present embodiment, the inner case outer peripheral surface 31a and the outer case inner peripheral surface 32a are in pressure contact with each other. Here, "pressure contact" means contacting with pressure. In this example, the inner case part 31 is press-fitted into the outer case part 32.

[0018] A cooling water passage 4 through which cooling water flows is formed between the inner case outer peripheral surface 31a and the outer case inner peripheral surface 32a. The cooling water passage 4 is constituted by a water passage forming groove part 41 formed in at least one of the inner case outer peripheral surface 31a and the outer case inner peripheral surface 32a. As shown in FIGS. 1 and 2, in the present embodiment, the water passage forming groove part 41 is formed in the inner case outer peripheral surface 31a. Also, in the present embodiment, the water passage forming groove part 41 includes a plurality of circumferentially extending parts 411 each formed along the circumferential direction C. The plurality of circumferentially extending parts 411 are arranged at intervals in the axial direction L with respect to each other. And the plurality of circumferentially extending parts 411 communicate with each other.

[0019] [[ID=|11]] As shown in Figure 1, the inner case portion 31 is provided with a fitting portion 311 that fits onto the stator outer surface 11a, which is the outer surface of the stator core 11. In this embodiment, the inner surface of the fitting portion 311 and the stator outer surface 11a are in pressure contact with each other. In this example, the fitting portion 311 is fitted to the stator outer surface 11a by shrink fitting. In addition, in this embodiment, a water channel forming groove portion 41 is formed on the inner case outer surface 31a of the inner case portion 31 that corresponds to the fitting portion 311.

[0020] The inner case portion 31 further includes an axial projection 312 formed to protrude axially L from the fitting portion 311. The axial projection 312 is positioned to cover at least the upper side of the coil end portion 13. In this application, "upper side" and "lower side" are defined based on the vertical direction (vertical direction in Figure 1) of the rotating electric machine 100 when it is mounted on the vehicle or other mounting object.

[0021] In this embodiment, the axial projection 312 includes a first axial projection 313 formed to project from the fitting portion 311 toward the first axial direction L1, and a second axial projection 314 formed to project from the fitting portion 311 toward the second axial direction L2. The first axial projection 313 is positioned to cover at least the upper side of the first coil end portion 14. The second axial projection 314 is positioned to cover at least the upper side of the second coil end portion 15. In this embodiment, each of the first axial projection 313 and the second axial projection 314 is formed continuously over the entire circumference in the circumferential direction C. That is, in this embodiment, each of the first axial projection 313 and the second axial projection 314 is formed in a cylindrical shape having an axis along the axial direction L.

[0022] In this embodiment, the inner case portion 31 further includes a fixing portion 315 for fixing to the outer case portion 32. In this embodiment, the fixing portion 315 protrudes radially outward R2 from the end of the second axial side L2 of the second axial projection 314 so as to face the outer case portion 32 from the second axial side L2. In the example shown in Figure 2, a plurality of fixing portions 315 are arranged dispersed in the circumferential direction C. Each of the plurality of fixing portions 315 is configured to be fixed to the outer case portion 32 by a bolt inserted from the second axial side L2.

[0023] As shown in Figure 1, a supply hole 5 is provided in the axial projection 312 at a position facing the coil end portion 13 from above, for supplying oil toward the coil end portion 13. Here, "position facing the coil end portion 13 from above" means a position above the coil end portion 13 and facing the coil end portion 13. Therefore, the supply hole 5 may be provided at a position that overlaps with the coil end portion 13 in a vertical view along the vertical direction (in other words, a position facing the coil end portion 13 in a direction along the vertical direction), or at a position that does not overlap with the coil end portion 13 in a vertical view (in other words, a position facing the coil end portion 13 in a direction inclined with respect to the vertical direction). In this embodiment, the supply hole 5 is provided at a position that overlaps with the coil end portion 13 in a vertical view, and is configured to drip oil toward the coil end portion 13. Furthermore, in this embodiment, the supply hole 5 includes a first supply hole 51 positioned opposite the first coil end portion 14 in the first axial projection 313 from above, and a second supply hole 52 positioned opposite the second coil end portion 15 in the second axial projection 314 from above.

[0024] In this embodiment, a circumferential groove 7 is formed on at least one of the outer peripheral surface 31a of the inner case and the inner peripheral surface 32a of the outer case. The circumferential groove 7 is formed in a concave shape extending in the circumferential direction C. In this embodiment, the circumferential groove 7 includes a first circumferential groove 71 located on the first axial side L1 with respect to the cooling water passage 4, and a second circumferential groove 72 located on the second axial side L2 with respect to the cooling water passage 4. In this embodiment, the first circumferential groove 71 is formed on the outer peripheral surface 31a of the inner case portion 31 in the portion corresponding to the first axial projection 313. The second circumferential groove 72 is formed on the outer peripheral surface 31a of the inner case portion 31 in the portion corresponding to the second axial projection 314.

[0025] As shown in Figure 2, in this embodiment, the first circumferential groove 71 and the second circumferential groove 72 are each formed in a part of the circumferential direction C on the outer peripheral surface 31a of the inner case (for example, the range of a circular arc in which the central angle defined by the axis of the inner case portion 31 is 120 degrees).

[0026] In this embodiment, multiple first supply holes 51 are distributed in the circumferential direction C. Multiple second supply holes 52 are also distributed in the circumferential direction C. In this embodiment, all of the multiple first supply holes 51 are arranged to overlap with the first coil end portion 14 when viewed in the vertical direction (vertical direction in Figure 1). Furthermore, all of the multiple second supply holes 52 are arranged to overlap with the second coil end portion 15 when viewed in the vertical direction. Here, regarding the arrangement of the two elements, "overlapping in a specific direction" means that when a virtual line parallel to the line of sight is moved in each direction perpendicular to that virtual line, there exists a region where the virtual line intersects both elements.

[0027] In this embodiment, each of the multiple first supply holes 51 communicates with a first circumferential groove 71. The first circumferential groove 71 is arranged to overlap with all of the multiple first supply holes 51 when viewed radially along the radial direction R. In this embodiment, each of the multiple second supply holes 52 communicates with a second circumferential groove 72. The second circumferential groove 72 is arranged to overlap with all of the multiple second supply holes 52 when viewed radially along the radial direction R. In the illustrated example, five first supply holes 51 are arranged at equal intervals in the circumferential direction C. The five first supply holes 51 are formed to penetrate the inner case portion 31 radially in the direction R from the bottom surface of the first circumferential groove 71. Also, five second supply holes 52 are arranged at equal intervals in the circumferential direction C. The five second supply holes 52 are formed to penetrate the inner case portion 31 radially in the direction R from the bottom surface of the second circumferential groove 72.

[0028] As shown in Figure 1, the outer case portion 32 is provided with an oil supply passage 6 for supplying oil to the supply hole 5. In this embodiment, the oil supply passage 6 is formed to communicate with the circumferential groove 7. In this embodiment, the oil supply passage 6 also includes a radial oil passage 61 formed along the radial direction R and an axial oil passage 62 formed along the axial direction L.

[0029] The radial oil passage 61 is formed to connect to the circumferential groove 7. In this embodiment, the radial oil passage 61 includes a first radial oil passage 611 formed to connect to the first circumferential groove 71, and a second radial oil passage 612 formed to connect to the second circumferential groove 72. The first radial oil passage 611 is formed to open to the portion of the inner circumferential surface 32a of the outer case that faces the first circumferential groove 71. The second radial oil passage 612 is formed to open to the portion of the inner circumferential surface 32a of the outer case that faces the second circumferential groove 72.

[0030] The axial oil passage 62 is formed to connect to the radial oil passage 61. Oil is supplied to the axial oil passage 62 from an oil supply source such as an oil pump, and the oil in the axial oil passage 62 is supplied to the circumferential groove 7 through the radial oil passage 61. In this embodiment, the axial oil passage 62 is formed to connect the first radial oil passage 611 and the second radial oil passage 612. Then, the oil from the axial oil passage 62 is supplied to the first circumferential groove 71 through the first radial oil passage 611, and the oil from the axial oil passage 62 is supplied to the second circumferential groove 72 through the second radial oil passage 612. In the illustrated example, the axial oil passage 62 is formed to connect to an oil passage formed in the gear mechanism housing case described above.

[0031] In the illustrated example, the radial oil passage 61 is formed by closing the radially outer R2 end of a hole that penetrates the outer case portion 32 in the radial direction R with a plug 61a (an example of a closing member). By forming the radial oil passage 61 with a hole formed in the outer case portion 32 in this way, it is easier to secure a higher degree of freedom in the formation position of the radial oil passage 61 in the axial direction L compared to when the radial oil passage 61 is formed with a groove formed on the mating surface between the outer case portion 32 and other case portions. Therefore, the configuration of the radial oil passage 61 formed to connect to the circumferential groove 7 can be simplified, thereby simplifying the configuration of the supply oil passage 6.

[0032] As described above, the rotating electric machine 100 is A stator 1 comprising a cylindrical stator core 11 and a coil 12 wound around the stator core 11, A rotor 2 is rotatably mounted radially inward R1 relative to the stator 1, A rotating electric machine 100 comprising a case 3 housing a stator 1 and a rotor 2, The coil 12 is provided with a coil end portion 13 that protrudes outward in the axial direction L from the stator core 11. Case 3 comprises a cylindrical inner case portion 31 having a fitting portion 311 that fits onto the outer peripheral surface 11a of the stator core 11, and a cylindrical outer case portion 32 arranged to cover the outer peripheral surface 31a of the inner case portion 31. A cooling water channel 4 is formed between the outer peripheral surface 31a of the inner case portion 31 and the inner peripheral surface 32a of the outer case portion 32 through which cooling water flows. The inner case portion 31 further includes an axial projection 312 that protrudes axially L from the fitting portion 311 and is arranged to cover at least the upper side of the coil end portion 13. A supply hole 5 is provided in the axial projection 312 at a position facing the coil end portion 13 from above, for supplying oil toward the coil end portion 13. The outer case portion 32 is provided with an oil supply passage 6 for supplying oil to the supply hole 5.

[0033] In this configuration, an axial projection 312 is provided on the inner case portion 31, which protrudes in the axial direction L from a fitting portion 311 that fits onto the outer peripheral surface 11a of the stator. A supply hole 5 is provided on the axial projection 312 at a position facing the coil end portion 13 from above, for supplying oil toward the coil end portion 13. A supply oil passage 6 for supplying oil to the supply hole 5 is provided on the outer case portion 32, which is arranged to cover the outer peripheral surface 31a of the inner case. This allows for proper supply of oil toward the coil end portion 13, and also simplifies the configuration of the oil passage, that is, the configuration of the supply hole 5 provided on the axial projection 312 of the inner case portion 31 and the supply oil passage 6 provided on the outer case portion 32. Therefore, it is possible to simplify the configuration of the oil passage for supplying oil to the coil end portion 13 while suppressing an increase in the size of the case 3.

[0034] As described above, in this embodiment, a concave circumferential groove 7 extending in the circumferential direction C is formed on at least one of the inner outer surface 31a of the inner case portion 31 and the inner outer surface 32a of the outer case portion 32. The supply oil passage 6 is formed to communicate with the circumferential groove 7, Multiple supply holes 5 are arranged in a distributed manner in the circumferential direction C. Each of the multiple supply holes 5 is connected to a circumferential groove 7.

[0035] This configuration allows oil to be supplied to multiple locations in the circumferential direction C of the coil end portion 13. Therefore, the coil end portion 13 can be cooled efficiently.

[0036] Furthermore, in this embodiment, the circumferential groove 7 is arranged so as to overlap with all of the multiple supply holes 5 when viewed radially along the radial direction R. The supply oil passage 6 includes a radial oil passage 61 formed along the radial direction R so as to connect to the circumferential groove 7, and an axial oil passage 62 formed along the axial direction L so as to connect to the radial oil passage 61.

[0037] In this configuration, the circumferential groove 7 formed on at least one of the outer peripheral surface 31a of the inner case and the inner peripheral surface 32a of the outer case is positioned so as to overlap all of the multiple supply holes 5, which are dispersed in the circumferential direction C, when viewed radially along the radial direction R. This allows for proper supply of oil to all of the multiple supply holes 5 with a simple configuration. Furthermore, according to this configuration, the supply oil passage 6 that supplies oil to the supply hole 5 includes a radial oil passage 61 formed along the radial direction R so as to connect to the circumferential groove 7, and an axial oil passage 62 formed along the axial direction L so as to connect to the radial oil passage 61. This allows for proper supply of oil to the circumferential groove 7 with a simple configuration.

[0038] As shown in Figure 1, in this embodiment, the rotating electric machine 100 further includes a sealing member 8 that seals the space between the outer peripheral surface 31a of the inner case and the inner peripheral surface 32a of the outer case. The sealing member 8 is configured to seal the space between the outer peripheral surface 31a of the inner case and the inner peripheral surface 32a of the outer case in a watertight and oiltight manner. The sealing member 8 is positioned between the cooling water channel 4 and the supply hole 5 in an axial direction L. On the other hand, the sealing member 8 is not positioned on the side opposite to the cooling water channel 4 in the axial direction L relative to the supply hole 5. In this embodiment, the sealing member 8 is provided in the groove portion formed in the portion of the outer peripheral surface 31a of the inner case between the water channel forming groove portion 41 and the first circumferential groove 71 in an axial direction L, and in the groove portion formed in the portion of the outer peripheral surface 31a of the inner case between the water channel forming groove portion 41 and the second circumferential groove 72 in an axial direction L. In this example, the sealing member 8 is an O-ring.

[0039] This configuration prevents the cooling water flowing through the cooling water passage 4 from mixing with the oil supplied to the supply hole 5 or leaking out to the stator 1. Furthermore, since the oil supplied to the supply hole 5 is for cooling the coil end portion 13, it is not a problem if it leaks out towards the stator 1. Therefore, by not providing a sealing member 8 on the side of the supply hole 5 opposite to the cooling water passage 4 in the axial direction L, as in this configuration, it is easier to keep the axial dimension L of the rotating electric machine 100 small.

[0040] In this embodiment, the inner case portion 31 is made of a different material from the outer case portion 32, and is made of a material with higher strength than the outer case portion 32. For example, ADC8-T5, an aluminum alloy, can be used as the material for the inner case portion 31, and ADC12-T5, an aluminum alloy, can be used as the material for the outer case portion 32.

[0041] With this configuration, the fitting portion 311 of the inner case portion 31 can be fitted to the outer peripheral surface 11a of the stator with a relatively large force.

[0042] In the following description, a vehicle drive system 1000 equipped with the above-mentioned rotating electric machine 100 will be explained with reference to the drawings.

[0043] As shown in Figure 4, the vehicle drive unit 1000 includes, in addition to the rotating electric machine 100, an input member I, a counter gear mechanism CG, a differential gear mechanism DF, and a housing member 9.

[0044] The input member I is positioned on the first axis X1, which is the rotation axis of the rotor 2. The counter gear mechanism CG is positioned on the second axis X2, which is different from the first axis X1. The differential gear mechanism DF is positioned on the third axis X3, which is different from the first axis X1 and the second axis X2. The first axis X1, the second axis X2, and the third axis X3 are positioned parallel to each other.

[0045] In the following explanation, the direction perpendicular to each of the axes X1 to X3 mentioned above will be referred to as the "radial direction R" relative to each axis. Note that when it is not necessary to distinguish which axis is the reference, or when it is clear which axis is the reference, it may simply be written as "radial direction R".

[0046] The housing member 9 houses the rotating electric machine 100, the input member I, the counter gear mechanism CG, and the differential gear mechanism DF. Inside the housing member 9, a first housing section A1 and a second housing section A2 are formed. The first housing section A1 is the space in which the rotating electric machine 100 is housed. The second housing section A2 is the space in which the input member I, the counter gear mechanism CG, and the differential gear mechanism DF are housed. The second housing section A2 is positioned adjacent to the first housing section A1 on the second axial side L2.

[0047] The housing member 9 comprises a first peripheral wall portion 91, a second peripheral wall portion 92, a first side wall portion 93, a second side wall portion 94, and a first partition wall portion 95.

[0048] The first circumferential wall portion 91 is formed in a cylindrical shape. The first circumferential wall portion 91 is positioned to cover the rotating electric machine 100 from the outside in the radial direction R.

[0049] The second circumferential wall portion 92 is formed in a cylindrical shape. The second circumferential wall portion 92 is positioned to cover the input member I, the counter gear mechanism CG, and the differential gear mechanism DF from the outside in the radial direction R.

[0050] The first side wall portion 93 is formed to extend along the radial direction R. The first side wall portion 93 is positioned to cover the rotating electric machine 100 from the axial first side L1.

[0051] The second side wall portion 94 is formed to extend along the radial direction R. The second side wall portion 94 is positioned to cover the input member I, the counter gear mechanism CG, and the differential gear mechanism DF from the axial second side L2.

[0052] The first partition wall 95 is formed to extend along the radial direction R. The first partition wall 95 is positioned to separate the first housing A1 and the second housing A2 in the axial direction L. In other words, the first partition wall 95 is positioned to cover the rotating electric machine 100 from the axial second side L2, and to cover the input member I, the counter gear mechanism CG, and the differential gear mechanism DF from the axial first side L1.

[0053] The first housing section A1 is formed by the first circumferential wall section 91, the first side wall section 93, and the first partition wall section 95. In other words, the space enclosed by the first circumferential wall section 91, the first side wall section 93, and the first partition wall section 95 inside the housing member 9 is formed as the first housing section A1.

[0054] The second housing section A2 is formed by the second peripheral wall section 92, the second side wall section 94, and the first partition wall section 95. In other words, the space enclosed by the second peripheral wall section 92, the second side wall section 94, and the first partition wall section 95 within the housing member 9 is formed as the second housing section A2.

[0055] As shown in Figures 4 and 5, the input member I is a member that rotates integrally with the rotor 2. The input member I comprises an input gear G1 and an input shaft IS.

[0056] The input gear G1 is connected to the input shaft IS so as to rotate integrally with it. The input shaft IS is formed to extend along the first axis X1. The input shaft IS penetrates the first bulkhead 95 in the axial direction L and is connected so as to rotate integrally with the rotor shaft 22. The rotor shaft 22 is rotatably supported against the first sidewall 93 via the first rotor bearing B11 and rotatably supported against the first bulkhead 95 via the second rotor bearing B12. The input shaft IS is also rotatably supported against the first bulkhead 95 via the first input bearing B21 and rotatably supported against the second sidewall 94 via the second input bearing B22.

[0057] As shown in Figures 4 and 6, the counter gear mechanism CG comprises a counter input gear G2, a counter output gear G3, and a counter shaft CS.

[0058] The counter input gear G2 and the counter output gear G3 are connected to rotate integrally via the counter shaft CS. The counter input gear G2 meshes with the input gear G1. The counter output gear G3 is formed to have a smaller diameter than the counter input gear G2. The counter output gear G3 is positioned axially on the first side L1 relative to the counter input gear G2.

[0059] The counter shaft CS is formed to extend along the second axis X2. The counter shaft CS is rotatably supported relative to the first partition wall 95 via the first counter bearing B31 and rotatably supported relative to the second side wall 94 via the second counter bearing B32.

[0060] The differential gear mechanism DF includes a differential input gear G4 that meshes with the counter output gear G3. The differential gear mechanism DF is configured to distribute the rotation of the differential input gear G4 to a pair of wheels (not shown).

[0061] The differential gear mechanism DF further comprises a differential case DC, a pair of pinion gears G5, and a pair of side gears G6. Here, both the pair of pinion gears G5 and the pair of side gears G6 are bevel gears.

[0062] The differential case DC is a hollow member that houses a pair of pinion gears G5 and a pair of side gears G6. The differential case DC is connected to the differential input gear G4 so as to rotate integrally with it. The differential case DC is rotatably supported against the first bulkhead 95 via the first differential bearing B41 and also rotatably supported against the second side wall 94 via the second differential bearing B42.

[0063] The pair of pinion gears G5 are positioned opposite each other, spaced radially R with respect to the third axis X3. The pair of pinion gears G5 are mounted on a pinion shaft PS, which is supported to rotate integrally with the differential case DC. Each of the pair of pinion gears G5 is configured to rotate freely (rotate) around the pinion shaft PS and to revolve freely (orbit) around the third axis X3.

[0064] A pair of side gears G6 mesh with a pair of pinion gears G5. The pair of side gears G6 are arranged to rotate around the third axis X3 as their axis of rotation. The pair of side gears G6 are spaced apart from each other in the axial direction L, facing each other with the pinion shaft PS in between.

[0065] The side gear G6 on the first axial side L1 is connected via the output shaft member OS to the first drive shaft DS1, which is connected to the wheel on the first axial side L1, so as to rotate integrally with it. The output shaft member OS is formed to extend along the third axis X3. The output shaft member OS is positioned to penetrate the differential case DC in the axial direction L. The output shaft member OS is slidably supported relative to the differential case DC. The output shaft member OS is also positioned to penetrate the first side wall portion 93 in the axial direction L. The output shaft member OS is rotatably supported relative to the first side wall portion 93 via the output bearing B5.

[0066] The axial second side gear G6 L2 is connected to the second drive shaft DS2, which is connected to the axial second side wheel L2, so as to rotate integrally with it. The axial second side gear G6 L2 includes a cylindrical portion G6a that extends along the axial direction L. The cylindrical portion G6a is positioned to penetrate the differential case DC and the second side wall 94 in the axial direction L. The cylindrical portion G6a is slidably supported relative to the differential case DC.

[0067] As shown in Figure 7, the vehicle drive system 1000 includes an inverter device INV. The inverter device INV is configured to control the rotating electric machine 100.

[0068] Inside the housing member 9, in addition to the first housing section A1 and the second housing section A2 described above, a third housing section A3 is formed. The third housing section A3 is a space in which the inverter device INV is housed. The third housing section A3 is positioned adjacent to the first housing section A1 and the second housing section A2 on the upper side when the vehicle is mounted. Here, "vehicle mounted state" refers to the state in which the vehicle drive unit 1000 is mounted on a vehicle.

[0069] The housing member 9 further comprises a second partition wall 96. The second partition wall 96 is formed to separate the first housing section A1 and the second housing section A2 from the third housing section A3.

[0070] The following describes the oil flow in the vehicle drive system 1000 with reference to Figures 5 to 7. In each of Figures 5 to 7, the black arrows indicate the oil flow.

[0071] As shown in Figure 5, the vehicle drive unit 1000 is equipped with an oil pump OP that pumps up and discharges oil stored inside the housing member 9. The oil pump OP is driven by a dedicated power source (e.g., an electric motor) that is independent of the power transmission path between the rotating electric machine 100 and the differential gear mechanism DF.

[0072] The oil discharged from the oil pump OP is cooled by the oil cooler OC. The oil cooled by the oil cooler OC is supplied to the axial oil passage 62. The oil supplied to the axial oil passage 62 is supplied to the second circumferential groove 72 through the second radial oil passage 612 and to the first circumferential groove 71 through the first radial oil passage 611. The oil supplied to the second circumferential groove 72 is supplied to the second coil end portion 15 through the second supply hole 52. The oil supplied to the first circumferential groove 71 is supplied to the first coil end portion 14 through the first supply hole 51. After the oil supplied to the first coil end portion 14 is cooled, it is supplied to the first rotor bearing B11 via the outer circumferential surface of the rotor shaft 22.

[0073] The supply oil passage 6 is connected to the internal shaft oil passage 22a to supply oil to the internal shaft oil passage 22a. The internal shaft oil passage 22a is formed inside the rotor shaft 22 so as to extend along the axial direction L. In this embodiment, the internal shaft oil passage 22a is the internal space of the rotor shaft 22, which is formed in a cylindrical shape with the first axis X1 as its axis.

[0074] In this embodiment, the oil supplied to the axial oil passage 62 flows along the axial oil passage 62 toward the first axial side L1 and is supplied to the first wall-internal oil passage 93a formed in the first side wall portion 93. The oil supplied to the first wall-internal oil passage 93a is supplied to the second wall-internal oil passage 93b formed in the first side wall portion 93 so as to extend along the radial direction R. The oil supplied to the second wall-internal oil passage 93b is supplied to a terminal block for electrically connecting the rotating electric machine 100 and the inverter device INV (see Figure 7), and cools the terminal block.

[0075] Furthermore, the oil supplied to the first wall-internal oil passage 93a is supplied to the shaft-internal oil passage 22a from the supply port 93c. The supply port 93c opens towards the axial second side L2 inside the rotor shaft 22 so as to supply oil to the shaft-internal oil passage 22a from the axial first side L1.

[0076] The oil supplied to the internal shaft oil passage 22a is supplied to the first through-hole 22b and the second through-hole 22c, which are formed to penetrate the rotor shaft 22 radially in the direction R. The first through-hole 22b and the second through-hole 22c are through-holes for supplying the oil from the internal shaft oil passage 22a toward the coil end portion 13. The first through-hole 22b is located on the first axial side L1 relative to the rotor core 21. The second through-hole 22c is located on the second axial side L2 relative to the rotor core 21. Multiple first through-holes 22b and second through-holes 22c are provided, distributed in the circumferential direction C.

[0077] In this embodiment, the oil supplied to the internal shaft oil passage 22a is supplied by the centrifugal force generated as the rotor shaft 22 rotates, through the first through hole 22b, and into the first internal core oil passage 21a, which is formed to penetrate the rotor core 21 in the axial direction L. Furthermore, the oil supplied to the internal shaft oil passage 22a is supplied by the centrifugal force generated as the rotor shaft 22 rotates, through the second through hole 22c, which is formed to penetrate the rotor shaft 22 radially R, and into the second internal core oil passage 21b, which is formed to penetrate the rotor core 21 in the axial direction L.

[0078] The oil supplied to the first core internal oil passage 21a flows through the first core internal oil passage 21a toward the second axial side L2 and reaches the first opening 21c which opens radially inward relative to the second coil end portion 15 in the radial direction R. The oil that reaches the first opening 21c is supplied to the second coil end portion 15 by the centrifugal force generated as the rotor 2 rotates.

[0079] The oil supplied to the second core internal oil passage 21b flows through the second core internal oil passage 21b toward the first axial side L1 and reaches the second opening 21d, which opens radially inward relative to the first coil end portion 14. The oil that reaches the second opening 21d is supplied to the first coil end portion 14 by the centrifugal force generated as the rotor 2 rotates.

[0080] As shown in Figure 6, the oil stored inside the housing member 9 is scraped up by the differential input gear G4. The oil scraped up by the differential input gear G4 is supplied to the surface of the differential case DC. A portion of the oil supplied to the surface of the differential case DC is supplied to the first differential bearing B41 and the second differential bearing B42, respectively. Another portion of the oil supplied to the surface of the differential case DC is supplied to the pair of pinion gears G5 and the pair of side gears G6 through through holes formed in the differential case DC.

[0081] Furthermore, the oil stirred up by the differential input gear G4 is supplied to a catch tank T located inside the storage member 9. The catch tank T is configured to store the oil stirred up by the differential input gear G4. The catch tank T is configured to supply the stored oil to the second rotor bearing B12 and the first input bearing B21, respectively, through the first tank oil passage T1. The catch tank T is also configured to supply the stored oil to the first counter bearing B31 through the second tank oil passage T2. The catch tank T is also configured to supply the stored oil to the second input bearing B22 through the third tank oil passage T3. The catch tank T is also configured to supply the stored oil to the second counter bearing B32 through the fourth tank oil passage T4.

[0082] Furthermore, as shown in Figure 7, the oil scraped up by the differential input gear G4 is supplied to the region adjacent to the axial first side L1 of the differential case DC, passing through the first differential oil passage 96a formed in the second partition wall 96, and then supplied from the axial first side L1 to the sliding part between the differential case DC and the output shaft member OS. Also, the oil scraped up by the differential input gear G4 is supplied to the region adjacent to the axial second side L2 of the differential case DC, passing through the second differential oil passage 94a formed in the second side wall 94, and then supplied from the axial second side L2 to the sliding part between the differential case DC and the cylindrical part G6a.

[0083] [Other Embodiments] (1) In the above embodiment, a configuration in which the first axial projection 313 and the second axial projection 314 are each continuously formed over the entire circumference of the circumferential direction C was described as an example. However, the configuration is not limited to such a configuration, and at least one of the first axial projection 313 and the second axial projection 314 may be formed only in a part of the circumferential direction C, or a part of the circumferential direction C may be cut out. For example, as shown in Figure 3, the first axial projection 313 may be formed to match the region in the circumferential direction C where the first circumferential groove 71 is located, and the second axial projection 314 may be formed to match the region in the circumferential direction C where the second circumferential groove 72 is located. In this case, the first axial projection 313 and the second axial projection 314 are provided above the rotation axis of the rotor 2, and not below the rotation axis of the rotor 2. With this configuration, it becomes easy to arrange, for example, a member for connecting the coil 12 to another device by utilizing the region in the circumferential direction C where the first axial projection 313 and the second axial projection 314 are not provided. This makes it easier to keep the axial dimension L of the rotating electric machine 100 small.

[0084] (2) In the above embodiment, a configuration was described as in which all of the multiple first supply holes 51 overlap with the first coil end portion 14 in a vertical view along the vertical direction, and all of the multiple second supply holes 52 overlap with the second coil end portion 15 in a vertical view along the vertical direction. However, the configuration is not limited to such a configuration, and some of the multiple first supply holes 51 do not overlap with the first coil end portion 14 in a vertical view, and some of the multiple second supply holes 52 do not overlap with the second coil end portion 15 in a vertical view. In this case, it is preferable that the multiple supply holes 5 are formed along the radial direction R and configured to spray oil toward the coil end portion 13. The multiple supply holes 5 may also be formed along the vertical direction.

[0085] (3) In the above embodiment, a configuration in which the first circumferential groove 71 and the second circumferential groove 72 are each formed in a part of the circumferential direction C on the outer peripheral surface 31a of the inner case was described as an example. However, the configuration is not limited to such a configuration, and at least one of the first circumferential groove 71 and the second circumferential groove 72 may not be formed on the outer peripheral surface 31a of the inner case but on the inner peripheral surface 32a of the outer case, or it may be formed on both the outer peripheral surface 31a of the inner case and the inner peripheral surface 32a of the outer case. Furthermore, at least one of the first circumferential groove 71 and the second circumferential groove 72 may be formed over the entire circumferential direction C.

[0086] (4) In the above embodiment, a configuration in which the supply hole 5 includes a first supply hole 51 and a second supply hole 52 was described as an example. However, the configuration is not limited to such a configuration, and the supply hole 5 may be configured not to include the first supply hole 51 or the second supply hole 52. For example, if the supply hole 5 does not include the second supply hole 52, it is preferable that cooling oil is supplied to the second coil end portion 15 from a supply portion of a different form than the supply hole 5 (for example, a supply portion provided radially inward R1 relative to the second coil end portion 15). Also, if the supply hole 5 does not include the first supply hole 51 or the second supply hole 52, the axial projection 312 may be configured not to include the first axial projection 313 or the second axial projection 314.

[0087] (5) In the above embodiment, a configuration was described as in which the first circumferential groove 71 is formed on the outer circumferential surface 31a of the inner case portion 31 corresponding to the first axial projection 313, and the second circumferential groove 72 is formed on the outer circumferential surface 31a of the inner case portion 31 corresponding to the second axial projection 314. However, the configuration is not limited to such a configuration, and at least one of the first circumferential groove 71 and the second circumferential groove 72 may be formed on the outer circumferential surface 31a of the inner case portion 31 other than the portion corresponding to the axial projection 312 (for example, the portion corresponding to the fitting portion 311). In this case, it is preferable that the circumferential groove 7 and the supply hole 5 are in communication with each other by a groove formed along the axial direction L.

[0088] (6) In the above embodiment, an example was described in which the material constituting the inner case portion 31 and the material constituting the outer case portion 32 are different from each other. However, the embodiment is not limited to such a configuration, and the inner case portion 31 and the outer case portion 32 may be made of the same material.

[0089] (7) In the above embodiment, a configuration was described as in which the oil in the shaft oil passage 22a is supplied to the first core oil passage 21a through the first through hole 22b and to the second core oil passage 21b through the second through hole 22c. However, the configuration is not limited to such a configuration, and for example, the oil in the shaft oil passage 22a may be supplied directly to the first coil end portion 14 from the first through hole 22b and to the second coil end portion 15 from the second through hole 22c.

[0090] (8) In the above embodiment, a configuration in which the first through hole 22b and the second through hole 22c are formed at two different locations in the axial direction L of the rotor shaft 22 was described as an example. However, the configuration is not limited to this, and through holes may be formed at one or three or more different locations in the axial direction L of the rotor shaft 22.

[0091] (9) The configurations disclosed in each of the embodiments described above can be applied in combination with configurations disclosed in other embodiments, as long as no inconsistencies arise. With regard to other configurations, the embodiments disclosed herein are merely illustrative in all respects. Therefore, various modifications can be made as appropriate without departing from the spirit of this disclosure.

[0092] [Summary of this embodiment] The following describes the overview of the rotating electric machine (100) described above.

[0093] The rotating electric machine (100) is A stator (1) comprising a cylindrical stator core (11) and a coil (12) wound around the stator core (11), A rotor (2) is rotatably mounted radially (R) inward (R1) relative to the stator (1), A rotating electric machine (100) comprising a case (3) housing the stator (1) and the rotor (2), The coil (12) is provided with a coil end portion (13) that protrudes outward in the axial direction (L) from the stator core (11), The case (3) comprises a cylindrical inner case portion (31) having a fitting portion (311) that fits onto the outer circumferential surface (11a) of the stator core (11), and a cylindrical outer case portion (32) arranged to cover the outer circumferential surface (31a) of the inner case portion (31). A cooling water channel (4) is formed between the outer circumferential surface (31a) of the inner case portion (31) and the inner circumferential surface (32a) of the outer case portion (32), through which cooling water flows. The inner case portion (31) further comprises an axial projection (312) that protrudes from the fitting portion (311) in the axial direction (L) and is arranged to cover at least the upper side of the coil end portion (13), A supply hole (5) for supplying oil toward the coil end portion (13) is provided at a position in the axial projection (312) that faces the coil end portion (13) from above. The outer case portion (32) is provided with an oil supply passage (6) for supplying oil to the supply hole (5).

[0094] In this configuration, an axial projection (312) is provided on the inner case portion (31) that protrudes axially (L) from a fitting portion (311) that fits onto the outer circumferential surface (11a) of the stator, and a supply hole (5) is provided on the axial projection (312) at a position facing the coil end portion (13) from above, for supplying oil toward the coil end portion (13). Furthermore, an oil supply passage (6) for supplying oil to the supply hole (5) is provided on the outer case portion (32) which is arranged to cover the outer circumferential surface (31a) of the inner case portion (31). This allows for proper supply of oil toward the coil end portion (13), and also simplifies the configuration of the oil passage, that is, the configuration of the supply hole (5) provided on the axial projection (312) of the inner case portion (31) and the oil supply passage (6) provided on the outer case portion (32). Therefore, the configuration of the oil passage for supplying oil to the coil end portion (13) can be simplified while suppressing an increase in the size of the case (3).

[0095] Here, the direction in which the rotor (2) rotates around its axis of rotation is defined as the circumferential direction (C). A concave circumferential groove (7) extending in the circumferential direction (C) is formed on at least one of the outer circumferential surface (31a) of the inner case portion (31) and the inner circumferential surface (32a) of the outer case portion (32). The oil supply passage (6) is formed to communicate with the circumferential groove (7), Multiple supply holes (5) are arranged in a distributed manner in the circumferential direction (C), It is preferable that each of the multiple supply holes (5) communicates with the circumferential groove (7).

[0096] This configuration allows oil to be supplied to multiple locations in the circumferential direction (C) of the coil end portion (13). Therefore, the coil end portion (13) can be cooled efficiently.

[0097] Furthermore, the circumferential groove (7) is arranged so as to overlap all of the multiple supply holes (5) when viewed radially along the radial direction (R). The supply oil passage (6) preferably comprises a radial oil passage (61) formed along the radial direction (R) so as to connect to the circumferential groove (7), and an axial oil passage (62) formed along the axial direction (L) so as to connect to the radial oil passage (61).

[0098] In this configuration, the circumferential groove (7) formed on at least one of the outer circumferential surface (31a) of the inner case portion (31) and the inner circumferential surface (32a) of the outer case portion (32) is positioned so as to overlap all of the multiple supply holes (5) that are dispersed in the circumferential direction (C) when viewed radially along the radial direction (R). This allows for the proper supply of oil to all of the multiple supply holes (5) with a simple configuration. Furthermore, according to this configuration, the supply oil passage (6) that supplies oil to the supply hole (5) includes a radial oil passage (61) formed along the radial direction (R) so as to connect to the circumferential groove (7), and an axial oil passage (62) formed along the axial direction (L) so as to connect to the radial oil passage (61). This allows for the proper supply of oil to the circumferential groove (7) with a simple configuration.

[0099] Furthermore, the rotating electric machine (100) further comprises a rotor shaft (22) that rotates integrally with the rotor (2), An internal oil passage (22a) is formed inside the rotor shaft (22) and extends along the axial direction (L). The supply oil passage (6) is connected to the shaft oil passage (22a) to supply oil to the shaft oil passage (22a), Preferably, the through holes (22b, 22c) for supplying oil from the internal shaft oil passage (22a) toward the coil end portion (13) are formed so as to penetrate the rotor shaft (22) in the radial direction (R).

[0100] With this configuration, in addition to supplying oil to the coil end portion (13) from the radially (R) outside through the supply hole (5), oil can also be supplied to the coil end portion (13) from the radially (R) inside through the through holes (22b, 22c). This ensures that the coil end portion (13) is adequately supplied with oil. Therefore, oil-based insulation between the conductors constituting the coil end portion (13) can be effectively achieved. Note that oil-based insulation between the conductors constituting the coil end portion (13) is particularly effective in high-voltage, high-output vehicle drive systems (1000) with relatively high system voltages (e.g., 800V or more).

[0101] Furthermore, the rotating electric machine (100) is further provided with a sealing member (8) that seals the space between the outer circumferential surface (31a) of the inner case portion (31) and the inner circumferential surface (32a) of the outer case portion (32). Preferably, the sealing member (8) is positioned between the cooling water channel (4) and the supply hole (5) in the axial direction (L), and is not positioned on the side of the supply hole (5) that is opposite to the cooling water channel (4) in the axial direction (L).

[0102] This configuration prevents the cooling water flowing through the cooling water passage (4) from mixing with the oil supplied to the supply hole (5) or leaking out to the stator (1). Furthermore, since the oil supplied to the supply hole (5) is for cooling the coil end section (13), it is not a problem if it leaks out towards the stator (1). Therefore, as in this configuration, by not providing a sealing member (8) on the side of the supply hole (5) opposite to the cooling water passage (4) in the axial direction (L), it is easier to keep the axial dimension (L) of the rotating electric machine (100) small.

[0103] Furthermore, it is preferable that the inner case portion (31) is made of a different material from the outer case portion (32) and is made of a material with higher strength than the outer case portion (32).

[0104] With this configuration, the fitting portion (311) of the inner case portion (31) can be fitted to the outer circumferential surface (11a) of the stator core (11) with a relatively large force. [Industrial applicability]

[0105] The technology described herein can be used in a rotating electric machine comprising a stator having a cylindrical stator core and coils wound around the stator core, a rotor rotatably mounted radially inward from the stator, and a case housing them. [Explanation of Symbols]

[0106] 100: Rotating electric machine, 1: Stator, 11: Stator core, 11a: Stator outer surface, 12: Coil, 13: Coil end, 2: Rotor, 3: Case, 31: Inner case section, 31a: Inner case outer surface, 311: Fitting section, 312: Axial projection, 32: Outer case section, 32a: Inner outer surface of outer case, 4: Cooling water passage, 5: Supply hole, 6: Supply oil passage, L: Axial direction, R: Radial direction, C: Circumferential direction

Claims

1. A stator comprising a cylindrical stator core and a coil wound around the stator core, A rotor is rotatably mounted radially inward from the stator, A rotating electric machine comprising a case housing the stator and the rotor, The coil has a coil end portion that protrudes axially outward from the stator core, The case comprises a cylindrical inner case portion having a fitting portion that fits onto the outer circumferential surface of the stator core, and a cylindrical outer case portion arranged to cover the outer circumferential surface of the inner case portion. A cooling water channel is formed between the outer circumferential surface of the inner case portion and the inner circumferential surface of the outer case portion, through which cooling water flows. The inner case portion further comprises an axial projection that protrudes from the fitting portion in the axial direction and is arranged to cover at least the upper side of the coil end portion. A supply hole for supplying oil toward the coil end is provided at a position in the axial projection facing the coil end from above. The outer case portion is provided with an oil supply passage for supplying oil to the supply hole. The direction in which the rotor rotates around its axis of rotation is defined as the circumferential direction. The axial projection is formed only in a portion of the circumferential region so as to face the coil end portion from above, in a rotating electric machine.

2. A concave circumferential groove extending in the circumferential direction is formed on at least one of the outer circumferential surface of the inner case portion and the inner circumferential surface of the outer case portion, The oil supply passage is formed to communicate with the circumferential groove, Multiple supply holes are arranged in a dispersed manner in the circumferential direction, The rotating electric machine according to claim 1, wherein each of the plurality of supply holes communicates with the circumferential groove.

3. The circumferential groove is arranged so as to overlap all of the multiple supply holes when viewed in the radial direction along the radial direction. The rotating electric machine according to claim 2, wherein the supply oil passage comprises a radial oil passage formed along the radial direction so as to connect to the circumferential groove, and an axial oil passage formed along the axial direction so as to connect to the radial oil passage.

4. The rotor shaft further comprises the rotor which rotates integrally with the rotor, An internal oil passage extending along the axial direction is formed inside the rotor shaft. The supply oil passage is connected to the shaft oil passage to supply oil to the shaft oil passage, The rotating electric machine according to claim 1, wherein a through hole for supplying oil from the internal shaft oil passage toward the coil end portion is formed so as to penetrate the rotor shaft in the radial direction.

5. The system further includes a sealing member that seals the space between the outer peripheral surface of the inner case portion and the inner peripheral surface of the outer case portion. The rotating electric machine according to any one of claims 1 to 4, wherein the sealing member is disposed between the cooling water passage and the supply hole in the axial direction, and is not disposed on the side of the supply hole opposite to the cooling water passage in the axial direction.

6. The rotating electric machine according to any one of claims 1 to 4, wherein the inner case portion is made of a different material from the outer case portion and is made of a material with higher strength than the outer case portion.

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