Rotating electric machine

Abstract

The invention relates to a rotating electrical machine. A housing (3) for housing a stator (1) and a rotor (2) is provided with a cylindrical inner housing part (31) provided with a fitting part (311) fitted to a stator outer peripheral surface (11a), and a cylindrical outer housing part (32) disposed so as to cover an inner housing outer peripheral surface (31a), and a cooling water path (4) through which cooling water flows is formed between the inner housing outer peripheral surface (31a) and an outer housing inner peripheral surface (32a). The inner housing section (31) is further provided with an axial protruding section (312) which is disposed so as to protrude in the axial direction (L) from the fitting section (311) and which covers at least the upper side of the coil end section (13), a supply hole (5) which supplies oil toward the coil end section (13) is provided in the axial protruding section (312) at a position facing the coil end section (13) from the upper side, and a supply oil passage (6) which supplies oil to the supply hole (5) is provided in the outer housing section (32).

Description

Technical Field

[0001] The present invention relates to a rotating electric machine including: a stator including a cylindrical stator core and a coil wound around the stator core; a rotor rotatably provided radially inwardly of the stator; and a housing accommodating these. Background Art

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

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

[0004] Patent Document 1: Japanese Patent Application Publication No. 2014-225969

[0005] However, in the rotating electric machine (3) of Patent Document 1, the housing includes: a center housing (10) formed in a cylindrical shape covering the radially outer side of a stator (12), and a side housing (30) joined to the center housing from one axial side. Furthermore, a groove (17) is formed on a surface of the center housing (10) facing the side housing (30), and the oil passage is formed by the groove being covered by the side housing (30).

[0006] In such a structure, since an oil passage is formed at the joint portion between the center housing (10) and the side housing (30), the structure of the oil passage tends to become complicated. In addition, in order to seal the oil passage, it is necessary to ensure a large radial dimension of the joint portion between the center housing (10) and the side housing (30), so the housing tends to be large. Summary of the invention

[0007] Therefore, it is desired to realize a rotating electric machine that can simplify the structure of an oil passage for supplying oil to the coil end portions and can suppress an increase in the size of a housing.

[0008] In view of the above situation, a characteristic structure of a rotating electric machine is a rotating electric machine comprising: a stator having a cylindrical stator core and a coil wound on the stator core; a rotor rotatably arranged on the inner side in the radial direction relative to the stator; and a housing that accommodates the stator and the rotor, wherein the coil comprises a coil end protruding outward in the axial direction from the stator core, the housing comprises: a cylindrical inner housing portion having a fitting portion fitted with the outer peripheral surface of the stator core, and a cylindrical outer housing portion configured to cover the outer peripheral surface of the inner housing portion, a cooling water passage for cooling water to flow is formed between the outer peripheral surface of the inner housing portion and the inner peripheral surface of the outer housing portion, the inner housing portion further comprises: an axial protrusion configured to protrude from the fitting portion in the axial direction and cover at least the upper side of the coil end, a supply hole for supplying oil toward the coil end is provided at a position of the axial protrusion that is opposite to the coil end from the upper side, and an oil supply passage for supplying oil to the supply hole is provided in the outer housing portion.

[0009] According to this characteristic structure, an axial protrusion that protrudes axially from an engaging portion engaged with the outer peripheral surface of the stator core is provided in the inner housing portion, and a supply hole for supplying oil toward the coil end is provided at a position in the axial protrusion that is opposite to the coil end from the upper side. Moreover, an oil supply passage for supplying oil to the supply hole is provided in the outer housing portion that is configured to cover the outer peripheral surface of the inner housing portion. Thus, oil can be appropriately supplied toward the coil end, and the structure of the oil passage used therefor, i.e., the supply hole provided in the axial protrusion of the inner housing portion and the structure of the oil supply passage provided in the outer housing portion, can be easily simplified. Therefore, the structure of the oil passage for supplying oil to the coil end can be simplified and the enlargement of the housing can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a cross-sectional view of the rotating electrical machine according to the embodiment.

[0011] Figure 2 It is a perspective view of the inner case portion of the rotating electrical machine according to the embodiment.

[0012] Figure 3 It is a perspective view of an inner case portion of a rotating electrical machine according to another embodiment.

[0013] Figure 4 It is a cross-sectional view of a vehicle drive device including a rotating electrical machine according to an embodiment.

[0014] Figure 5 It is a cross-sectional view showing the flow of oil in a vehicle drive device.

[0015] Figure 6 It is a cross-sectional view showing the flow of oil in a vehicle drive device.

[0016] Figure 7 It is a cross-sectional view showing the flow of oil in a vehicle drive device. DETAILED DESCRIPTION

[0017] Hereinafter, a rotating electrical machine 100 according to an embodiment will be described with reference to the drawings. The rotating electrical machine 100 according to the present embodiment is used as a driving force source for a vehicle such as a hybrid vehicle or an electric vehicle.

[0018] like Figure 1 As shown, the rotating electric machine 100 includes a stator 1, a rotor 2 rotatably provided on the stator 1, and a housing 3 accommodating 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.

[0019] In the following description, the axis of rotation of the rotor 2 (see Figure 1 The direction (single-dot chain line in FIG. 1 ) is defined as “axial direction L”. Furthermore, one side of the axial direction L is defined as “axial first side L1”, and the other side of the axial direction L is defined as “axial second side L2”. In addition, the direction orthogonal to the rotation axis of the rotor 2 is defined as “radial direction R”. Furthermore, in the radial direction R, the rotation axis side of the rotor 2 is defined as “radial inner side R1”, and the opposite side is defined as “radial outer side R2”. Furthermore, the direction around the rotation axis of the rotor 2 is defined as “circumferential direction C”.

[0020] The stator 1 includes a cylindrical stator core 11 and a coil 12 wound on the stator core 11. The stator core 11 is fixed to a non-rotating member (here, the housing 3). The coil 12 includes a coil end 13 protruding from the stator core 11 to the outside in the axial direction L. In the present embodiment, the coil end 13 includes: a first coil end 14 protruding from the stator core 11 to the first axial side L1, and a second coil end 15 protruding from the stator core 11 to the second axial side L2.

[0021] The rotor 2 is arranged radially inwardly R1 relative to the stator 1. The rotor 2 includes a cylindrical rotor core 21. In the present embodiment, the rotor core 21 is connected to a rotor shaft 22 extending along the axial direction L so as to rotate integrally therewith. The rotor shaft 22 is arranged radially inwardly R1 relative to the rotor core 21 so as to penetrate the rotor core 21 along the axial direction L. Although not shown in the figure, permanent magnets are provided in the rotor core 21.

[0022] The housing 3 includes an inner housing portion 31 and an outer housing portion 32. Each of the inner housing portion 31 and the outer housing portion 32 is formed in a cylindrical shape. The outer housing portion 32 is arranged radially outward R2 relative to the inner housing portion 31. In this example, the outer housing portion 32 is formed integrally with a gear mechanism housing housing that houses a gear mechanism constituting the above-mentioned vehicle drive device.

[0023] The inner housing portion 31 and the outer housing portion 32 are configured so that the outer peripheral surface of the inner housing portion 31, that is, the inner housing outer peripheral surface 31a, and the inner peripheral surface of the outer housing portion 32, that is, the outer housing inner peripheral surface 32a, are in contact with each other. In this way, the outer housing portion 32 is configured to cover the inner housing outer peripheral surface 31a. In this embodiment, the inner housing outer peripheral surface 31a and the outer housing inner peripheral surface 32a are pressed against each other. Here, "pressing" means contacting with pressure. In this example, the inner housing portion 31 is pressed into the outer housing portion 32.

[0024] A cooling water path 4 through which cooling water flows is formed between the inner case outer circumferential surface 31a and the outer case inner circumferential surface 32a. The cooling water path 4 is composed of a water path forming groove 41 formed in at least one of the inner case outer circumferential surface 31a and the outer case inner circumferential surface 32a. Figure 1 as well as Figure 2 As shown, in this embodiment, the water channel forming groove portion 41 is formed on the inner shell outer peripheral surface 31a. In addition, in this embodiment, the water channel forming groove portion 41 includes a plurality of circumferential extension portions 411 respectively formed along the circumferential direction C. The plurality of circumferential extension portions 411 are arranged at intervals from each other in the axial direction L. Moreover, the plurality of circumferential extension portions 411 are connected to each other.

[0025] like Figure 1 As shown in FIG. 1 , the inner housing portion 31 includes a fitting portion 311 that fits with the outer peripheral surface of the stator core 11, that is, the stator outer peripheral surface 11a. In this embodiment, the inner peripheral surface of the fitting portion 311 and the stator outer peripheral surface 11a are pressed against each other. In this example, the fitting portion 311 fits with the stator outer peripheral surface 11a by burn-fitting. In addition, in this embodiment, a water channel forming groove portion 41 is formed on the inner housing outer peripheral surface 31a of the inner housing portion 31 corresponding to the fitting portion 311.

[0026] The inner housing portion 31 further includes an axial protrusion 312 formed to protrude from the fitting portion 311 in the axial direction L. The axial protrusion 312 is configured to cover at least the upper side of the coil end portion 13. In the present application, "upper side" and "lower side" are based on the up-down direction (L) of the rotating electrical machine 100 in a state of being mounted on a mounting object such as the above-mentioned vehicle. Figure 1 The up and down directions in the diagram are specified.

[0027] In the present embodiment, the axial protrusion 312 includes: a first axial protrusion 313 formed to protrude from the fitting portion 311 to the first axial side L1, and a second axial protrusion 314 formed to protrude from the fitting portion 311 to the second axial side L2. The first axial protrusion 313 is configured to cover at least the upper side of the first coil end 14. The second axial protrusion 314 is configured to cover at least the upper side of the second coil end 15. In the present embodiment, each of the first axial protrusion 313 and the second axial protrusion 314 is continuously formed over the entire circumference of the circumferential direction C. That is, in the present embodiment, each of the first axial protrusion 313 and the second axial protrusion 314 is formed into a cylindrical shape having an axis along the axial direction L.

[0028] In the present embodiment, the inner housing portion 31 further includes a fixing portion 315 for fixing to the outer housing portion 32. In the present embodiment, the fixing portion 315 projects radially outward R2 from the end of the second axial protrusion portion 314 on the second axial side L2 in a manner opposed to the outer housing portion 32 from the second axial side L2. Figure 2 In the illustrated example, the plurality of fixing portions 315 are dispersedly arranged 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 .

[0029] like Figure 1 As shown, a supply hole 5 for supplying oil toward the coil end 13 is provided at a position in the axial protrusion 312 that is opposite to the coil end 13 from the upper side. Here, "a position opposite to the coil end 13 from the upper side" refers to a position that is higher than the coil end 13 and opposite to the coil end 13. Therefore, the supply hole 5 can be provided at a position that overlaps with the coil end 13 when viewed in the up-down direction along the up-down direction (in other words, a position that is opposite to the coil end 13 in the direction along the up-down direction), or it can be provided at a position that does not overlap with the coil end 13 when viewed in the up-down direction (in other words, a position that is opposite to the coil end 13 in a direction inclined relative to the up-down direction). In the present embodiment, the supply hole 5 is configured to be provided at a position that overlaps with the coil end 13 when viewed in the up-down direction, and to drip oil toward the coil end 13. In the present embodiment, the supply holes 5 include a first supply hole 51 disposed in the first axially protruding portion 313 and facing the first coil end 14 from above, and a second supply hole 52 disposed in the second axially protruding portion 314 and facing the second coil end 15 from above.

[0030] In the present embodiment, a circumferential groove 7 is formed on at least one of the inner housing outer peripheral surface 31a and the outer housing inner peripheral surface 32a. The circumferential groove 7 is formed in a concave shape extending in the circumferential direction C. In the present embodiment, the circumferential groove 7 includes: a first circumferential groove 71 arranged on the axial first side L1 relative to the cooling water channel 4, and a second circumferential groove 72 arranged on the axial second side L2 relative to the cooling water channel 4. In the present embodiment, the first circumferential groove 71 is formed on the inner housing outer peripheral surface 31a of the portion corresponding to the first axial protrusion 313 in the inner housing portion 31. In addition, the second circumferential groove 72 is formed on the inner housing outer peripheral surface 31a of the portion corresponding to the second axial protrusion 314 in the inner housing portion 31.

[0031] like Figure 2 As shown, in the present embodiment, each of the first circumferential groove 71 and the second circumferential groove 72 is formed in a portion of the circumferential direction C of the inner shell outer peripheral surface 31a (for example, a range of an arc whose central angle defined by the axis of the inner shell portion 31 is 120 degrees).

[0032] In the present embodiment, the plurality of first supply holes 51 are arranged in a dispersed manner along the circumferential direction C. In addition, the plurality of second supply holes 52 are arranged in a dispersed manner along the circumferential direction C. In the present embodiment, all of the plurality of first supply holes 51 are arranged in a dispersed manner along the up-down direction ( Figure 1 When viewed in the up-down direction (the up-down direction in the vertical direction), the first coil end portion 14 is overlapped. In addition, all of the plurality of second supply holes 52 are configured to overlap with the second coil end portion 15 when viewed in the up-down direction along the up-down direction. Here, regarding the configuration of two components, "overlapping when viewed in a specific direction" means that when an imaginary straight line parallel to the line of sight is moved in directions orthogonal to the imaginary straight line, there is an area where the imaginary straight line intersects both of the two components.

[0033] In the present embodiment, each of the plurality of first supply holes 51 is communicated with the first circumferential groove 71. Furthermore, the first circumferential groove 71 is configured to overlap all of the plurality of first supply holes 51 when viewed radially in the radial direction R. In addition, in the present embodiment, each of the plurality of second supply holes 52 is communicated with the second circumferential groove 72. Furthermore, the second circumferential groove 72 is configured to overlap all of the plurality of second supply holes 52 when viewed radially in the radial direction R. In the illustrated example, five first supply holes 51 are arranged at equal intervals in the circumferential direction C. Furthermore, the five first supply holes 51 are formed to penetrate the inner housing portion 31 in the radial direction R from the bottom surface of the first circumferential groove 71. Furthermore, the five second supply holes 52 are arranged at equal intervals in the circumferential direction C. Furthermore, the five second supply holes 52 are formed to penetrate the inner housing portion 31 in the radial direction R from the bottom surface of the second circumferential groove 72.

[0034] like Figure 1As shown, the outer housing portion 32 is provided with a supply oil passage 6 for supplying oil to the supply hole 5. In the present embodiment, the supply oil passage 6 is formed to communicate with the circumferential groove 7. In the present embodiment, the supply oil passage 6 includes a radial oil passage 61 formed along the radial direction R and an axial oil passage 62 formed along the axial direction L.

[0035] The radial oil passage 61 is formed to be connected to the circumferential groove 7. In the present embodiment, the radial oil passage 61 includes a first radial oil passage 611 formed to be connected to the first circumferential groove 71, and a second radial oil passage 612 formed to be connected to the second circumferential groove 72. The first radial oil passage 611 is formed to be opened in a portion of the outer case inner circumferential surface 32a that is opposite to the first circumferential groove 71. The second radial oil passage 612 is formed to be opened in a portion of the outer case inner circumferential surface 32a that is opposite to the second circumferential groove 72.

[0036] The axial oil passage 62 is formed to be connected 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 the present embodiment, the axial oil passage 62 is formed to connect the first radial oil passage 611 and the second radial oil passage 612. Moreover, the oil in the axial oil passage 62 is supplied to the first circumferential groove 71 through the first radial oil passage 611, and the oil in the axial oil passage 62 is supplied to the second circumferential groove 72 through the second radial oil passage 612. In the example shown in the figure, the axial oil passage 62 is formed to be connected to the oil passage formed in the gear mechanism housing housing.

[0037] In the example shown in the figure, the radial oil passage 61 is formed by closing the end of the radial outer side R2 of the hole portion penetrating the outer housing portion 32 in the radial direction R with a plug 61a (an example of a closing member). In this way, compared with the case where the radial oil passage 61 is formed by a groove portion formed on the mating surface of the outer housing portion 32 and other housing portions, the radial oil passage 61 is formed by the hole portion formed in the outer housing portion 32, and the degree of freedom of the formation position of the radial oil passage 61 in the axial direction L can be easily ensured. Therefore, the structure of the radial oil passage 61 formed to be connected to the circumferential groove 7 can be simplified, and the structure of the supply oil passage 6 can be simplified.

[0038] As described above, the rotating electric machine 100 includes: a stator 1 including a cylindrical stator core 11 and a coil 12 wound around the stator core 11; a rotor 2 rotatably disposed on the radially inner side R1 relative to the stator 1; and a housing 3 accommodating the stator 1 and the rotor 2. The coil 12 includes a coil end 13 protruding outward from the stator core 11 in the axial direction L. The housing 3 includes: a cylindrical inner housing portion 31 including a fitting portion 311 fitted with a stator outer peripheral surface 11a of the stator core 11, and an inner housing portion 31 configured to cover the inner housing portion 31. The cylindrical outer housing portion 32 of the side housing outer circumferential surface 31a forms a cooling water path 4 for cooling water to flow between the inner housing outer circumferential surface 31a of the inner housing portion 31 and the outer housing inner circumferential surface 32a of the outer housing portion 32. The inner housing portion 31 also includes an axial protrusion 312 configured to protrude from the fitting portion 311 in the axial direction L and cover at least the upper side of the coil end 13. A supply hole 5 for supplying oil to the coil end 13 is provided at a position in the axial protrusion 312 that is opposite to the coil end 13 from the upper side, and an oil supply path 6 for supplying oil to the supply hole 5 is provided in the outer housing portion 32.

[0039] According to this structure, an axial protrusion 312 protruding in the axial direction L from a fitting portion 311 fitted with the stator outer peripheral surface 11a is provided in the inner housing portion 31, and a supply hole 5 for supplying oil toward the coil end 13 is provided at a position in the axial protrusion 312 that is opposite to the coil end 13 from the upper side. In addition, an oil supply passage 6 for supplying oil to the supply hole 5 is provided in the outer housing portion 32 that is configured to cover the inner housing outer peripheral surface 31a. Thus, oil can be appropriately supplied to the coil end 13, and the structure of the oil passage used therefor, that is, the supply hole 5 provided in the axial protrusion 312 of the inner housing portion 31 and the structure of the oil supply passage 6 provided in the outer housing portion 32 can be easily simplified. Therefore, the structure of the oil passage for supplying oil to the coil end 13 can be simplified and the enlargement of the housing 3 can be suppressed.

[0040] As described above, in the present embodiment, a concave circumferential groove 7 extending along the circumferential direction C is formed on at least one of the inner shell outer peripheral surface 31a of the inner shell portion 31 and the outer shell inner peripheral surface 32a of the outer shell portion 32, the supply oil passage 6 is formed to be connected to the circumferential groove 7, and a plurality of supply holes 5 are dispersedly arranged along the circumferential direction C, and each of the plurality of supply holes 5 is connected to the circumferential groove 7.

[0041] According to this configuration, oil can be supplied to a plurality of positions in the coil end portion 13 in the circumferential direction C. Therefore, the coil end portion 13 can be cooled efficiently.

[0042] In addition, in the present embodiment, the circumferential groove 7 is configured to overlap with all of the multiple supply holes 5 when viewed radially along the radial direction R, and the supply oil passage 6 includes: a radial oil passage 61 formed along the radial direction R in a manner connected to the circumferential groove 7, and an axial oil passage 62 formed along the axial direction L in a manner connected to the radial oil passage 61.

[0043] According to this structure, the circumferential groove 7 formed in at least one of the inner case outer peripheral surface 31a and the outer case inner peripheral surface 32a is arranged to overlap all of the plurality of supply holes 5 dispersedly arranged along the circumferential direction C when viewed in the radial direction along the radial direction R. Thus, oil can be appropriately supplied to all of the plurality of supply holes 5 with a simple structure.

[0044] In addition, according to this structure, the supply oil passage 6 for supplying oil to the supply hole 5 includes a radial oil passage 61 formed along the radial direction R so as to be connected to the circumferential groove 7, and an axial oil passage 62 formed along the axial direction L so as to be connected to the radial oil passage 61. Thus, oil can be appropriately supplied to the circumferential groove 7 with a simple structure.

[0045] like Figure 1 As shown, in the present embodiment, the rotary electric machine 100 further includes a sealing member 8 that seals between the inner case outer circumferential surface 31a and the outer case inner circumferential surface 32a. The sealing member 8 is configured to seal between the inner case outer circumferential surface 31a and the outer case inner circumferential surface 32a in a watertight and oiltight manner. The sealing member 8 is arranged between the cooling water path 4 and the supply hole 5 in the axial direction L. On the other hand, the sealing member 8 is not arranged on the side opposite to the cooling water path 4 side in the axial direction L with respect to the supply hole 5. In the present embodiment, the sealing member 8 is provided in each of the groove portion formed in the inner case outer circumferential surface 31a between the water path forming groove portion 41 and the first circumferential groove 71 in the axial direction L, and the groove portion formed in the inner case outer circumferential surface 31a between the water path forming groove portion 41 and the second circumferential groove 72 in the axial direction L. In this example, the sealing member 8 is an O-ring.

[0046] According to this configuration, it is possible to prevent the cooling water flowing through the cooling water channel 4 from being mixed with the oil supplied to the supply hole 5 or from leaking toward the stator 1 side.

[0047] In addition, the oil supplied to the supply hole 5 is oil for cooling the coil end 13, so there is no problem even if it leaks to the stator 1 side. Therefore, as in this structure, the sealing member 8 is not provided on the side opposite to the cooling water channel 4 side in the axial direction L with respect to the supply hole 5, so that the dimension of the axial direction L of the rotating electric machine 100 can be easily suppressed to be small.

[0048] In the present embodiment, the inner housing portion 31 is made of a material different from that of the outer housing portion 32 and having a higher strength than that of the outer housing portion 32. For example, ADC8-T5, which is an aluminum alloy, can be used as the material constituting the inner housing portion 31, and ADC12-T5, which is an aluminum alloy, can be used as the material constituting the outer housing portion 32.

[0049] According to this structure, the fitting portion 311 of the inner case portion 31 can be fitted into the stator outer peripheral surface 11 a with a relatively large force.

[0050] Hereinafter, a vehicle drive device 1000 including the above-described rotating electrical machine 100 will be described with reference to the drawings.

[0051] like Figure 4 As shown, the vehicle drive device 1000 includes an input member I, a counter gear mechanism CG, a differential gear mechanism DF, and a storage member 9 in addition to the above-mentioned rotating electrical machine 100.

[0052] The input member I is arranged on the first axis X1, which is the rotation axis of the rotor 2. The counter gear mechanism CG is arranged on the second axis X2 which is different from the first axis X1. The differential gear mechanism DF is arranged 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 arranged parallel to each other.

[0053] In the following description, directions orthogonal to the axes X1 to X3 are referred to as “radial directions R” based on the axes. When it is not necessary to distinguish which axis is used as a reference or it is clear which axis is used as a reference, it may be simply described as “radial directions R”.

[0054] The storage component 9 stores the rotating electrical machine 100, the input component I, the counter gear mechanism CG, and the differential gear mechanism DF. A first storage portion A1 and a second storage portion A2 are formed inside the storage component 9. The first storage portion A1 is a space for storing the rotating electrical machine 100. The second storage portion A2 is a space for storing the input component I, the counter gear mechanism CG, and the differential gear mechanism DF. The second storage portion A2 is adjacent to the first storage portion A1 and is arranged on the second axial side L2.

[0055] The storage member 9 includes 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 .

[0056] The first peripheral wall portion 91 is formed in a cylindrical shape. The first peripheral wall portion 91 is arranged so as to cover the rotating electrical machine 100 from the radial direction R outer side.

[0057] The second peripheral wall portion 92 is formed in a cylindrical shape. The second peripheral wall portion 92 is arranged so as 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.

[0058] The first side wall portion 93 is formed to extend along the radial direction R. The first side wall portion 93 is arranged to cover the rotary electric machine 100 from the axial first side L1 .

[0059] The second side wall portion 94 is formed to extend in the radial direction R. The second side wall portion 94 is arranged to cover the input member I, the counter gear mechanism CG, and the differential gear mechanism DF from the second axial side L2.

[0060] The first partition wall portion 95 is formed to extend along the radial direction R. The first partition wall portion 95 is configured to separate the first housing portion A1 from the second housing portion A2 along the axial direction L. That is, the first partition wall portion 95 is configured to cover the rotary 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.

[0061] The first storage section A1 is formed by the first peripheral wall 91, the first side wall 93, and the first partition wall 95. That is, the space surrounded by the first peripheral wall 91, the first side wall 93, and the first partition wall 95 inside the storage member 9 is formed as the first storage section A1.

[0062] The second storage section A2 is formed by the second peripheral wall 92, the second side wall 94, and the first partition wall 95. That is, the space surrounded by the second peripheral wall 92, the second side wall 94, and the first partition wall 95 inside the storage member 9 is formed as the second storage section A2.

[0063] like Figure 4 as well as Figure 5 As shown, the input member I is a member that rotates integrally with the rotor 2. The input member I includes an input gear G1 and an input shaft IS.

[0064] The input gear G1 is connected to the input shaft IS in a manner of integral rotation. The input shaft IS is formed to extend along the first axis X1. The input shaft IS penetrates the first partition wall portion 95 in the axial direction L and is connected to the rotor shaft 22 in a manner of integral rotation. The rotor shaft 22 is rotatably supported by the first side wall portion 93 via the first rotor bearing B11, and is rotatably supported by the first partition wall portion 95 via the second rotor bearing B12. In addition, the input shaft IS is rotatably supported by the first partition wall portion 95 via the first input bearing B21, and is rotatably supported by the second side wall portion 94 via the second input bearing B22.

[0065] like Figure 4 as well as Figure 6As shown, the counter gear mechanism CG includes a counter input gear G2, a counter output gear G3 and a counter shaft CS.

[0066] The reverse input gear G2 and the reverse output gear G3 are connected to rotate integrally via the countershaft CS. The reverse input gear G2 meshes with the input gear G1. The reverse output gear G3 is formed to have a smaller diameter than the reverse input gear G2. The reverse output gear G3 is arranged on the first axial side L1 relative to the reverse input gear G2.

[0067] The auxiliary shaft CS is formed to extend along the second axis X2. The auxiliary shaft CS is rotatably supported by the first partition wall portion 95 via the first auxiliary bearing B31, and is rotatably supported by the second side wall portion 94 via the second auxiliary bearing B32.

[0068] The differential gear mechanism DF includes a differential input gear G4 meshing 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).

[0069] The differential gear mechanism DF further includes a differential case DC, a pair of pinion gears G5, and a pair of side gears G6. Here, the pair of pinion gears G5 and the pair of side gears G6 are both bevel gears.

[0070] The differential case DC is a hollow component that accommodates 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 in a manner that rotates integrally. The differential case DC is rotatably supported by the first partition wall portion 95 via the first differential bearing B41, and is rotatably supported by the second side wall portion 94 via the second differential bearing B42.

[0071] The pair of pinion gears G5 are arranged to be spaced apart and opposed to each other along the radial direction R based on the third axis X3. The pair of pinion gears G5 are mounted on the pinion shaft PS supported to rotate integrally with the differential case DC. Each of the pair of pinion gears G5 is configured to be rotatable (autorotation) around the pinion shaft PS and rotatable (revolution) around the third axis X3.

[0072] The pair of side gears G6 mesh with the pair of pinion gears G5. The pair of side gears G6 are arranged to rotate about the third axis X3 as the rotation axis. The pair of side gears G6 are arranged to be spaced apart from each other in the axial direction L and to face each other with the pinion shaft PS interposed therebetween.

[0073] The side gear G6 on the axial first side L1 is connected to the first drive shaft DS1 connected to the wheel connected to the axial first side L1 via the output shaft member OS in a manner of integral rotation. The output shaft member OS is formed to extend along the third axis X3. The output shaft member OS is configured to penetrate the differential case DC in the axial direction L. The output shaft member OS is supported by the differential case DC so as to be slidable. In addition, the output shaft member OS is configured to penetrate the first side wall portion 93 in the axial direction L. The output shaft member OS is supported by the first side wall portion 93 so as to be rotatable via the output bearing B5.

[0074] The side gear G6 on the axial second side L2 is connected to the second drive shaft DS2 connected to the wheel on the axial second side L2 in a manner that rotates integrally. The side gear G6 on the axial second side L2 includes a tubular portion G6a formed in a tubular shape extending along the axial direction L. The tubular portion G6a is configured to penetrate the differential case DC and the second side wall portion 94 along the axial direction L. The tubular portion G6a is supported by the differential case DC so as to be slidable.

[0075] like Figure 7 As shown, the vehicle drive device 1000 includes an inverter device INV. The inverter device INV is configured to control the rotating electric machine 100.

[0076] In addition to the first storage section A1 and the second storage section A2, a third storage section A3 is formed inside the storage component 9. The third storage section A3 is a space for storing the inverter device INV. The third storage section A3 is arranged adjacent to the upper side of the first storage section A1 and the second storage section A2 in the vehicle-mounted state. Here, the "vehicle-mounted state" refers to a state in which the vehicle drive device 1000 is mounted on a vehicle.

[0077] The storage member 9 further includes a second partition wall portion 96. The second partition wall portion 96 is formed to partition the first storage portion A1 and the second storage portion A2 from the third storage portion A3.

[0078] Below, refer to Figure 5 to Figure 7 The flow of oil in the vehicle drive device 1000 will be described. Figure 5 to Figure 7 In each of the figures, the black arrows show the flow of oil.

[0079] like Figure 5 As shown, the vehicle drive device 1000 includes an oil pump OP for pumping and discharging oil stored in the storage member 9. The oil pump OP is driven by a dedicated driving force source (eg, an electric motor) independent of the power transmission path between the rotary electric machine 100 and the differential gear mechanism DF.

[0080] 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 is supplied to the first circumferential groove 71 via the first radial oil passage 611. The oil supplied to the second circumferential groove 72 is supplied to the second coil end 15 through the second supply hole 52. The oil supplied to the first circumferential groove 71 is supplied to the first coil end 14 through the first supply hole 51. The oil supplied to the first coil end 14 is supplied to the first rotor bearing B11 through the outer peripheral surface of the rotor shaft 22 after cooling the first coil end 14.

[0081] The supply oil passage 6 is connected to the in-shaft oil passage 22a so as to supply oil to the in-shaft oil passage 22a. The in-shaft oil passage 22a is formed inside the rotor shaft 22 so as to extend along the axial direction L. In the present embodiment, the in-shaft oil passage 22a is an internal space of the rotor shaft 22 formed in a cylindrical shape with the first axis X1 as the axis center.

[0082] In the present embodiment, the oil supplied to the axial oil passage 62 flows in the axial oil passage 62 toward the axial first side L1 and is supplied to the first inner wall oil passage 93a formed in the first side wall portion 93. The oil supplied to the first inner wall oil passage 93a is supplied to the second inner wall oil passage 93b formed in the first side wall portion 93 so as to extend in the radial direction R. The oil supplied to the second inner wall oil passage 93b is supplied to the inverter device INV ( Figure 7 ) is supplied to an electrically connected junction box to cool the junction box.

[0083] The oil supplied to the first wall oil passage 93a is supplied from the supply port 93c to the shaft oil passage 22a. The supply port 93c opens toward the axial second side L2 in the rotor shaft 22 to supply oil from the axial first side L1 to the shaft oil passage 22a.

[0084] The oil supplied to the shaft oil passage 22a is supplied to the first through hole 22b and the second through hole 22c formed to penetrate the rotor shaft 22 in the radial direction R. The first through hole 22b and the second through hole 22c are through holes for supplying the oil in the shaft oil passage 22a toward the coil end 13. The first through hole 22b is arranged on the axial first side L1 with respect to the rotor core 21. The second through hole 22c is arranged on the axial second side L2 with respect to the rotor core 21. A plurality of the first through holes 22b and the second through holes 22c are arranged dispersedly in the circumferential direction C.

[0085] In the present embodiment, the oil supplied to the in-shaft oil passage 22a is supplied to the first in-core oil passage 21a formed to penetrate the rotor core 21 in the axial direction L through the first through hole 22b by the centrifugal force generated by the rotation of the rotor shaft 22. In addition, the oil supplied to the in-shaft oil passage 22a is supplied to the second in-core oil passage 21b formed to penetrate the rotor core 21 in the axial direction L through the second through hole 22c formed to penetrate the rotor shaft 22 in the radial direction R by the centrifugal force generated by the rotation of the rotor shaft 22.

[0086] The oil supplied to the first iron core oil passage 21a flows toward the axial second side L2 in the first iron core oil passage 21a and reaches the first opening 21c opened inwardly in the radial direction R relative to the second coil end 15. The oil reaching the first opening 21c is supplied to the second coil end 15 by the centrifugal force generated by the rotation of the rotor 2.

[0087] The oil supplied to the second iron core oil passage 21b flows in the second iron core oil passage 21b toward the axial first side L1 and reaches the second opening 21d opened inwardly in the radial direction R relative to the first coil end 14. The oil reaching the second opening 21d is supplied to the first coil end 14 by the centrifugal force generated by the rotation of the rotor 2.

[0088] like Figure 6 As shown, the oil stored in the storage member 9 is lifted up by the differential input gear G4. The oil lifted 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 each of the first differential bearing B41 and the second differential bearing B42. Another portion of the oil supplied to the surface of the differential case DC is supplied to a pair of pinion gears G5 and a pair of side gears G6 through a through hole formed in the differential case DC.

[0089] In addition, the oil lifted by the differential input gear G4 is supplied to the oil collecting tank T provided inside the storage part 9. The oil collecting tank T is configured to store the oil lifted by the differential input gear G4. The oil collecting tank T is configured to supply the stored oil to each of the second rotor bearing B12 and the first input bearing B21 through the first tank oil passage T1. In addition, the oil collecting tank T is configured to supply the stored oil to the first auxiliary bearing B31 through the second tank oil passage T2. In addition, the oil collecting tank T is configured to supply the stored oil to the second input bearing B22 through the third tank oil passage T3. In addition, the oil collecting tank T is configured to supply the stored oil to the second auxiliary bearing B32 through the fourth tank oil passage T4.

[0090] In addition, if Figure 7As shown, the oil lifted up by the differential input gear G4 is supplied to the region adjacent to the end of the differential case DC on the axial first side L1 in the axial direction through the first differential oil passage 96a formed in the second partition wall portion 96, and then supplied to the sliding portion between the differential case DC and the output shaft member OS from the axial first side L1. In addition, the oil lifted up by the differential input gear G4 is supplied to the region adjacent to the end of the differential case DC on the axial second side L2 in the axial direction through the second differential oil passage 94a formed in the second side wall portion 94, and then supplied to the sliding portion between the differential case DC and the cylindrical portion G6a from the axial second side L2.

[0091] [Other implementation methods]

[0092] (1) In the above embodiment, the structure in which each of the first axial protrusion 313 and the second axial protrusion 314 is continuously formed over the entire circumference C is described as an example. However, the present invention is not limited to such a structure, and at least one of the first axial protrusion 313 and the second axial protrusion 314 may be formed only in a part of the circumference C, or a part of the circumference C may be cut off. For example, Figure 3 As shown, the first axial protrusion 313 may also be formed in accordance with the area where the first circumferential groove 71 is located in the circumferential direction C, and the second axial protrusion 314 may also be formed in accordance with the area where the second circumferential groove 72 is located in the circumferential direction C. In this case, the first axial protrusion 313 and the second axial protrusion 314 are arranged on the upper side of the rotation axis of the rotor 2, and are not arranged on the lower side of the rotation axis of the rotor 2. According to this structure, it becomes easy to configure a component for connecting the coil 12 to other identifications by utilizing the area in the circumferential direction C where the first axial protrusion 313 and the second axial protrusion 314 are not arranged. As a result, it is easy to suppress the size of the axial direction L of the rotating electric machine 100 to be small.

[0093] (2) In the above embodiment, the structure in which all of the plurality of first supply holes 51 overlap with the first coil end 14 when viewed in the up-down direction along the up-down direction, and all of the plurality of second supply holes 52 overlap with the second coil end 15 when viewed in the up-down direction along the up-down direction is described as an example. However, the present invention is not limited to such a structure, and a part of the plurality of first supply holes 51 may not overlap with the first coil end 14 when viewed in the up-down direction, and a part of the plurality of second supply holes 52 may not overlap with the second coil end 15 when viewed in the up-down direction. In this case, it is preferred that the plurality of supply holes 5 are formed along the radial direction R so as to spray oil toward the coil end 13. In addition, the plurality of supply holes 5 may also be formed along the up-down direction.

[0094] (3) In the above embodiment, the first circumferential groove 71 and the second circumferential groove 72 are each formed in a part of the area in the circumferential direction C of the inner case outer peripheral surface 31a. However, the present invention is not limited to such a structure, and at least one of the first circumferential groove 71 and the second circumferential groove 72 may be formed in the outer case inner peripheral surface 32a but not in the inner case outer peripheral surface 31a, or may be formed in both the inner case outer peripheral surface 31a and the outer case inner peripheral surface 32a. In addition, at least one of the first circumferential groove 71 and the second circumferential groove 72 may be formed in the entire area in the circumferential direction C.

[0095] (4) In the above embodiment, the structure in which the supply hole 5 includes the first supply hole 51 and the second supply hole 52 is described as an example. However, the present invention is not limited to such a structure, and the supply hole 5 may also be a structure that does not include the first supply hole 51 or the second supply hole 52. For example, in the case where the supply hole 5 does not include the second supply hole 52, it is preferable to set a structure in which the cooling oil is supplied to the second coil end 15 from a supply portion of a different form from the supply hole 5 (for example, a supply portion provided at the radial inner side R1 relative to the second coil end 15). In addition, in the case where the supply hole 5 does not include the first supply hole 51 or the second supply hole 52, it is also possible to set a structure in which the axial protrusion 312 does not include the first axial protrusion 313 or the second axial protrusion 314.

[0096] (5) In the above embodiment, the first circumferential groove 71 is formed on the inner housing outer peripheral surface 31a of the portion corresponding to the first axial protrusion 313 in the inner housing portion 31, and the second circumferential groove 72 is formed on the inner housing outer peripheral surface 31a of the portion corresponding to the second axial protrusion 314 in the inner housing portion 31. However, the present invention is not limited to such a structure, and at least one of the first circumferential groove 71 and the second circumferential groove 72 may be formed on the inner housing outer peripheral surface 31a of a portion other than the portion corresponding to the axial protrusion 312 in the inner housing portion 31 (for example, a portion corresponding to the fitting portion 311). In this case, it is preferable that the circumferential groove 7 and the supply hole 5 are connected via a groove formed along the axial direction L.

[0097] (6) In the above embodiment, the material constituting the inner housing portion 31 and the material constituting the outer housing portion 32 are described as examples. However, the present invention is not limited to such a structure, and the inner housing portion 31 and the outer housing portion 32 may be made of the same material.

[0098] (7) In the above embodiment, the structure in which the oil in the shaft oil passage 22a is supplied to the first iron core oil passage 21a through the first through hole 22b and is supplied to the second iron core oil passage 21b through the second through hole 22c is described as an example. However, the present invention is not limited to such a structure, and for example, the oil in the shaft oil passage 22a may be supplied directly to the first coil end 14 from the first through hole 22b and directly to the second coil end 15 from the second through hole 22c.

[0099] (8) In the above embodiment, the structure in which the first through hole 22b and the second through hole 22c are respectively formed at two different positions in the axial direction L of the rotor shaft 22 is described as an example. However, the present invention is not limited to such a structure, and the through holes may be formed at one position or three or more different positions in the axial direction L of the rotor shaft 22.

[0100] (9) In addition, the structures disclosed in the above-mentioned embodiments can be combined with the structures disclosed in other embodiments for application as long as no contradiction occurs. With regard to other structures, the embodiments disclosed in this specification are merely exemplary in all aspects. Therefore, various changes can be appropriately made without departing from the scope of the purpose of the present invention.

[0101] [Summary of the present embodiment]

[0102] Hereinafter, the outline of the rotating electrical machine 100 described above will be described.

[0103] The rotating electric machine 100 includes: a stator 1 including a cylindrical stator core 11 and a coil 12 wound on the stator core 11; a rotor 2 rotatably disposed on an inner side R1 in a radial direction R relative to the stator 1; and a housing 3 accommodating the stator 1 and the rotor 2, wherein the coil 12 includes a coil end 13 protruding outward from the stator core 11 in an axial direction L, and the housing 3 includes: a cylindrical inner housing portion 31 including a fitting portion 311 fitted with an outer peripheral surface 11a of the stator core 11, and an outer peripheral surface 31a configured to cover the inner housing portion 31 The cylindrical outer housing portion 32 forms a cooling water path 4 for cooling water to flow between the outer circumferential surface 31a of the inner housing portion 31 and the inner circumferential surface 32a of the outer housing portion 32. The inner housing portion 31 also includes: an axial protrusion 312 configured to protrude from the interlocking portion 311 toward the axial direction L and cover at least the upper side of the coil end 13, a supply hole 5 for supplying oil toward the coil end 13 is provided at a position of the axial protrusion 312 opposite to the coil end 13 from the upper side, and an oil supply path 6 for supplying oil to the supply hole 5 is provided in the outer housing portion 32.

[0104] According to this structure, an axial protrusion 312 protruding in the axial direction L from a fitting portion 311 fitted with the stator outer peripheral surface 11a is provided in the inner housing portion 31, and a supply hole 5 for supplying oil to the coil end 13 is provided at a position in the axial protrusion 312 that is opposite to the coil end 13 from the upper side. In addition, an oil supply passage 6 for supplying oil to the supply hole 5 is provided in the outer housing portion 32 that is configured to cover the outer peripheral surface 31a of the inner housing portion 31. Thus, oil can be appropriately supplied to the coil end 13, and the structure of the oil passage used therefor, that is, the supply hole 5 provided in the axial protrusion 312 of the inner housing portion 31 and the structure of the oil supply passage 6 provided in the outer housing portion 32 can be easily simplified. Therefore, the structure of the oil passage for supplying oil to the coil end 13 can be simplified, and the enlargement of the housing 3 can be suppressed.

[0105] Here, it is preferred that the direction around the rotation axis of the above-mentioned rotor 2 is set as the circumferential direction C, and a concave circumferential groove 7 extending along the above-mentioned circumferential direction C is formed on at least one of the outer circumferential surface 31a of the above-mentioned inner housing portion 31 and the inner circumferential surface 32a of the above-mentioned outer housing portion 32, and the above-mentioned supply oil passage 6 is formed to be connected to the above-mentioned circumferential groove 7, and the multiple supply holes 5 are dispersedly arranged along the above-mentioned circumferential direction C, and each of the multiple supply holes 5 is connected to the above-mentioned circumferential groove 7.

[0106] According to this configuration, oil can be supplied to a plurality of positions in the coil end portion 13 in the circumferential direction C. Therefore, the coil end portion 13 can be cooled efficiently.

[0107] In addition, it is preferred that the circumferential groove 7 is configured to overlap with all of the multiple supply holes 5 when observed radially along the radial direction R, and the supply oil passage 6 comprises: a radial oil passage 61 formed along the radial direction R in a manner connected to the circumferential groove 7, and an axial oil passage 62 formed along the axial direction L in a manner connected to the radial oil passage 61.

[0108] According to this structure, 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 arranged so as to overlap all of the plurality of supply holes 5 dispersedly arranged along the circumferential direction C when viewed in the radial direction along the radial direction R. Thus, oil can be appropriately supplied to all of the plurality of supply holes 5 with a simple structure.

[0109] In addition, according to this structure, the supply oil passage 6 for supplying oil to the supply hole 5 includes a radial oil passage 61 formed along the radial direction R so as to be connected to the circumferential groove 7, and an axial oil passage 62 formed along the axial direction L so as to be connected to the radial oil passage 61. Thus, oil can be appropriately supplied to the circumferential groove 7 with a simple structure.

[0110] In addition, it is preferred that the above-mentioned rotating electrical machine 100 further includes a rotor shaft 22 that rotates integrally with the above-mentioned rotor 2, and an in-shaft oil passage 22a extending along the above-mentioned axial direction L is formed inside the above-mentioned rotor shaft 22, and the above-mentioned supply oil passage 6 is connected to the above-mentioned in-shaft oil passage 22a in a manner of supplying oil to the above-mentioned in-shaft oil passage 22a, and the through holes 22b and 22c for supplying the oil in the above-mentioned in-shaft oil passage 22a toward the above-mentioned coil end portion 13 are formed to penetrate the above-mentioned rotor shaft 22 along the above-mentioned radial direction R.

[0111] According to this structure, in addition to supplying oil to the coil end 13 from the outside of the radial direction R through the supply hole 5, oil can also be supplied to the coil end 13 from the inside of the radial direction R through the through holes 22b and 22c. As a result, oil can be fully supplied to the coil end 13. Therefore, insulation by oil between the conductors constituting the coil end 13 can be effectively performed. In addition, insulation by oil between the conductors constituting the coil end 13 is particularly effective in a vehicle drive device 1000 with a relatively high system voltage, for example, a high voltage / high output of 800V or more.

[0112] In addition, the rotating electrical machine 100 preferably further comprises: a sealing component 8 for sealing the outer circumferential surface 31a of the inner housing portion 31 and the inner circumferential surface 32a of the outer housing portion 32, wherein the sealing component 8 is arranged between the cooling water path 4 and the axial direction L of the supply hole 5, and is not arranged on the side of the axial direction L opposite to the cooling water path 4 side relative to the supply hole 5.

[0113] According to this configuration, it is possible to prevent the cooling water flowing through the cooling water channel 4 from being mixed with the oil supplied to the supply hole 5 or from leaking toward the stator 1 side.

[0114] In addition, the oil supplied to the supply hole 5 is oil for cooling the coil end 13, so there is no problem even if it leaks to the stator 1 side. Therefore, as in this structure, the sealing member 8 is not provided on the side opposite to the cooling water channel 4 side in the axial direction L with respect to the supply hole 5, so that the dimension of the axial direction L of the rotating electric machine 100 can be suppressed to be small.

[0115] In addition, it is preferable that the inner case portion 31 is made of a material different from that of the outer case portion 32 and has a higher strength than that of the outer case portion 32 .

[0116] According to this structure, the fitting portion 311 of the inner case portion 31 can be fitted into the outer peripheral surface 11 a of the stator core 11 with a relatively large force.

[0117] Possibility of industrial application

[0118] The technology of the present invention can be used for a rotating electric machine including: a stator including a cylindrical stator core and a coil of the stator core; a rotor rotatably provided radially inwardly of the stator; and a case accommodating these.

[0119] Description of Reference Numerals

[0120] 100: Rotating electric machine, 1: Stator, 11: Stator core, 11a: Stator outer peripheral surface, 12: Coil, 13: Coil end, 2: Rotor, 3: Housing, 31: Inner housing portion, 31a: Inner housing outer peripheral surface, 311: Fitting portion, 312: Axial protrusion, 32: Outer housing portion, 32a: Outer housing inner peripheral surface, 4: Cooling water passage, 5: Supply hole, 6: Oil supply passage, L: Axial direction, R: Radial direction, C: Circumferential direction.

Claims

1. A rotating electrical machine comprising: A stator including a cylindrical stator core and a coil wound around the stator core; a rotor rotatably disposed radially inwardly of the stator; and a housing for housing the stator and the rotor, In the rotating electrical machine, The coil includes: a coil end portion protruding outward in the axial direction from the stator core; The housing includes: a cylindrical inner housing portion including a fitting portion fitted with an outer peripheral surface of the stator core, and a cylindrical outer housing portion arranged to cover the outer peripheral surface of the inner housing portion. A cooling water passage through which cooling water flows is formed between the outer peripheral surface of the inner casing portion and the inner peripheral surface of the outer casing portion. The inner housing portion further includes an axially protruding portion that is configured to protrude from the fitting portion in the axial direction and cover at least an upper side of the coil end portion. A supply hole for supplying oil toward the coil end is provided at a position of the axially protruding portion that is opposed to the coil end from the upper side. The outer case portion is provided with an oil supply passage for supplying oil to the supply hole.

2. The rotating electrical machine according to claim 1, wherein: The direction around the rotation axis of the rotor is defined as the circumferential direction. A concave circumferential groove extending in the circumferential direction is formed on at least one of the outer circumferential surface of the inner casing portion and the inner circumferential surface of the outer casing portion. The oil supply passage is formed to communicate with the circumferential groove. The plurality of supply holes are dispersedly arranged along the circumferential direction. Each of the plurality of supply holes communicates with the circumferential groove.

3. The rotating electrical machine according to claim 2, wherein: The circumferential groove is arranged to overlap all of the plurality of supply holes when viewed in the radial direction. The oil supply passage includes a radial oil passage formed along the radial direction so as to be connected to the circumferential groove, and an axial oil passage formed along the axial direction so as to be connected to the radial oil passage.

4. The rotating electrical machine according to claim 1, wherein: It also includes: a rotor shaft that rotates integrally with the rotor, An inner shaft oil passage extending along the axial direction is formed inside the rotor shaft. The oil supply passage is connected to the shaft inner oil passage in a manner of supplying oil to the shaft inner oil passage. A through hole for supplying the oil in the shaft oil passage toward the coil end portion is formed to penetrate the rotor shaft in the radial direction.

5. The rotating electrical machine according to any one of claims 1 to 4, wherein: The invention further comprises: a sealing member for sealing between the outer peripheral surface of the inner casing portion and the inner peripheral surface of the outer casing portion; 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 electrical machine according to any one of claims 1 to 4, wherein: The inner case portion is made of a material different from that of the outer case portion and having a higher strength than that of the outer case portion.

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