Rotating electric machine and drive unit

Abstract

To provide a rotary electric machine and a driving device having a structure that allows a reduced number of components.SOLUTION: A rotary electric machine 10 comprises: a hollow shaft 31; a housing 20; a static elimination device 80 that is fixed on the housing 20 and makes electrical contact with the hollow shaft 31 and the housing 20; and a nozzle member 70 that supplies a fluid into an inside of the shaft 31. The shaft 31 includes an open end part 31d being open to one side of an axial direction. The housing 20 includes: a bottom wall part 23a positioned at one side of the axial direction of the open end part 31d; and a peripheral wall part 23b projecting to the other side of the axial direction from the bottom wall part 23a and surrounding the open end part 31d. The nozzle member 70 includes: a supply cylinder part 71 with at least one part thereof being inserted into an inside of the shaft 31 from the open end part 31d; and a flange part 72 projecting to an outer side of a radial direction from the supply cylinder part 71. The static elimination device 80 is positioned in an inner side of the radial direction of the peripheral wall part 23b, and the flange part 72 is positioned between the static elimination device 80 and the bottom wall part 23a in the axial direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a rotating electric machine and a drive device. [Background technology]

[0002] There is known a charge dissipation device that dissipates charge from the shaft of a rotating electric machine. For example, Patent Document 1 discloses a current distribution ring having conductive segments that contact the shaft. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6163480 Summary of the Invention [Problem to be solved by the invention]

[0004] In a rotating electric machine equipped with the above-mentioned charge dissipation device, a nozzle member that supplies a fluid into the hollow shaft may be provided, for example, for the purpose of cooling, etc. In such a rotating electric machine, fixing members are required to fix the charge dissipation device and the nozzle member, respectively, which increases the number of parts in the rotating electric machine.

[0005] In view of the above circumstances, an object of the present invention is to provide a rotating electric machine and a drive device having a structure that can reduce the number of parts. [Means for solving the problem]

[0006] One aspect of the rotating electric machine of the present invention includes a rotor having a hollow shaft rotatable around a central axis, a stator facing the rotor with a gap therebetween, a housing that accommodates the rotor and the stator inside, a bearing that rotatably supports the rotor, a static eliminator fixed to the housing and in electrical contact with the shaft and the housing, and a nozzle member that supplies a fluid to the inside of the shaft. The shaft has an open end that opens to one axial side. The housing has a bottom wall portion located on one axial side of the open end, and a peripheral wall portion that protrudes from the bottom wall portion to the other axial side and surrounds the open end. The nozzle member has a supply tube portion at least a part of which is inserted into the inside of the shaft from the open end, and a flange portion that protrudes radially outward from the supply tube portion. The static eliminator is located radially inside the peripheral wall portion. The flange portion is located axially between the static eliminator and the bottom wall portion.

[0007] One aspect of the drive device of the present invention is a drive device mounted on a vehicle, and comprises the above-mentioned rotating electric machine and a transmission device connected to the rotating electric machine and transmitting the rotation of the rotating electric machine to an axle of the vehicle. Effect of the Invention

[0008] According to one aspect of the present invention, the number of parts of a rotating electric machine and the number of parts of a drive device can be reduced. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram showing a drive device according to a first embodiment. [Diagram 2] FIG. 2 is a cross-sectional view showing a part of the rotating electric machine according to the first embodiment. [Diagram 3] FIG. 3 is an exploded perspective view showing the static eliminator and the nozzle member of the first embodiment. [Figure 4] FIG. 4 is a perspective view showing the nozzle member of the first embodiment. [Diagram 5]FIG. 5 is a cross-sectional view showing a part of a rotating electric machine according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] In the following description, the vertical direction is defined based on the positional relationship when the drive device of the embodiment is mounted on a vehicle positioned on a horizontal road surface. In other words, the relative positional relationship in the vertical direction described in the following embodiment only needs to be satisfied when the drive device is mounted on a vehicle positioned on a horizontal road surface.

[0011] In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction is the vertical direction. The side where the Z-axis arrow points (+Z side) is the upper side in the vertical direction, and the opposite side to the side where the Z-axis arrow points (-Z side) is the lower side in the vertical direction. In the following description, the upper side in the vertical direction is simply called the "upper side", and the lower side in the vertical direction is simply called the "lower side". The X-axis direction is a direction perpendicular to the Z-axis direction and is the front-rear direction of the vehicle on which the drive unit is mounted. In the following embodiments, the side where the X-axis arrow points (+X side) is the front side of the vehicle, and the opposite side to the side where the X-axis arrow points (-X side) is the rear side of the vehicle. The Y-axis direction is a direction perpendicular to both the X-axis direction and the Z-axis direction, and is the left-right direction of the vehicle, that is, the vehicle width direction. In the following embodiments, the side toward which the Y-axis arrow points (+Y side) is the left side of the vehicle, and the opposite side to the side toward which the Y-axis arrow points (-Y side) is the right side of the vehicle. The front-rear and left-right directions are horizontal directions perpendicular to the vertical direction.

[0012] The positional relationship in the front-rear direction is not limited to that in the following embodiment, and the side toward which the X-axis arrow points (+X side) may be the rear side of the vehicle, and the opposite side to the side toward which the X-axis arrow points (-X side) may be the front side of the vehicle. In this case, the side toward which the Y-axis arrow points (+Y side) is the right side of the vehicle, and the opposite side to the side toward which the Y-axis arrow points (-Y side) is the left side of the vehicle. In this specification, the "parallel direction" includes a substantially parallel direction, and the "perpendicular direction" includes a substantially perpendicular direction.

[0013] The central axis J, which is shown in the drawings as appropriate, is a virtual axis extending in a direction intersecting the vertical direction. More specifically, the central axis J extends in the Y-axis direction perpendicular to the vertical direction, that is, in the left-right direction of the vehicle. In the following description, unless otherwise specified, the direction parallel to the central axis J is simply referred to as the "axial direction", the radial direction centered on the central axis J is simply referred to as the "radial direction", and the circumferential direction centered on the central axis J, that is, around the axis of the central axis J, is simply referred to as the "circumferential direction". In the following embodiments, the right side (-Y side) is referred to as the "one axial side", and the left side (+Y side) is referred to as the "other axial side".

[0014] First Embodiment A drive device 100 according to the present embodiment shown in FIG. 1 is a drive device mounted on a vehicle and rotates an axle 64. The vehicle on which the drive device 100 is mounted is a vehicle that uses a motor as a power source, such as a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHV), or an electric vehicle (EV). As shown in FIG. 1, the drive device 100 includes a rotating electric machine 10 and a transmission device 60. The transmission device 60 is connected to the rotating electric machine 10 and transmits the rotation of the rotating electric machine 10, that is, the rotation of a rotor 30 described below, to an axle 64 of the vehicle. The transmission device 60 according to the present embodiment includes a gear housing 61, a reduction gear 62 connected to the rotating electric machine 10, and a differential gear 63 connected to the reduction gear 62.

[0015] The gear housing 61 accommodates therein the reduction gear 62, the differential gear 63, and oil O. The oil O is stored in a lower region within the gear housing 61. The oil O circulates within a refrigerant flow passage 90, which will be described later. The oil O is used as a refrigerant that cools the rotating electric machine 10. The oil O is also used as a lubricant for the reduction gear 62 and the differential gear 63. As the oil O, for example, it is preferable to use an oil equivalent to an automatic transmission lubricant (ATF: Automatic Transmission Fluid) that has a relatively low viscosity in order to function as a refrigerant and a lubricant.

[0016] The differential device 63 has a ring gear 63a. Torque output from the rotating electric machine 10 is transmitted to the ring gear 63a via the reduction gear 62. A lower end of the ring gear 63a is immersed in oil O stored in the gear housing 61. The oil O is scooped up as the ring gear 63a rotates. The scooped up oil O is supplied to the reduction gear 62 and the differential device 63, for example, as lubricating oil.

[0017] The rotating electric machine 10 is a part that drives the drive device 100. The rotating electric machine 10 is located, for example, on one axial side (-Y side) of the transmission device 60. In this embodiment, the rotating electric machine 10 is a motor. The rotating electric machine 10 includes a motor housing 20, a rotor 30 having a shaft 31, bearings 34 and 35 that rotatably support the rotor 30, a stator 40, a resolver 50, a nozzle member 70, and a static eliminator 80. The bearings 34 and 35 are, for example, ball bearings.

[0018] The motor housing 20 is a housing that accommodates the rotor 30 and the stator 40 therein. The motor housing 20 is connected to one axial side (-Y side) of the gear housing 61. The motor housing 20 has a main body portion 21, a partition wall portion 22, and a lid portion 23. The main body portion 21 and the partition wall portion 22 are, for example, part of the same single member. The lid portion 23 is, for example, separate from the main body portion 21 and the partition wall portion 22.

[0019] The main body 21 is cylindrical and surrounds the central axis J, opening on one axial side (-Y side). The partition wall 22 is connected to an end of the main body 21 on the other axial side (+Y side). The partition wall 22 axially separates the interior of the motor housing 20 from the interior of the gear housing 61. The partition wall 22 has a partition wall opening 22a connecting the interior of the motor housing 20 to the interior of the gear housing 61. A bearing 34 is held in the partition wall 22. The lid portion 23 is fixed to an end of the main body 21 on one axial side. The lid portion 23 closes the opening on one axial side of the main body 21. A bearing 35 is held in the lid portion 23.

[0020] As shown in Fig. 2, the cover portion 23 has a hole portion 23f recessed from the surface of the cover portion 23 on the other axial side (+Y side) toward one axial side (-Y side). The hole portion 23f is a hole that has a bottom on one axial side and opens to the other axial side. In this embodiment, the hole portion 23f is a circular hole centered on the central axis J. By providing the hole portion 23f, the cover portion 23 is provided with a bottom wall portion 23a and a peripheral wall portion 23b. In other words, the motor housing 20 has the bottom wall portion 23a and the peripheral wall portion 23b.

[0021] The bottom wall portion 23a is the bottom of the hole portion 23f. The bottom wall portion 23a is located on one axial side (-Y side) of the open end portion 31d of the shaft 31. The peripheral wall portion 23b protrudes from the radial outer circumferential edge portion of the bottom wall portion 23a to the other axial side (+Y side). The peripheral wall portion 23b surrounds the open end portion 31d of the shaft 31. The inner peripheral surface of the peripheral wall portion 23b is the inner peripheral surface of the hole portion 23f. In this embodiment, the inner peripheral surface of the peripheral wall portion 23b is cylindrical with the central axis J as its center.

[0022] The peripheral wall portion 23b has a first wall portion 23c, a second wall portion 23d, and a third wall portion 23e. The first wall portion 23c is a portion connected to the radial outer peripheral edge portion of the bottom wall portion 23a. The second wall portion 23d is connected to the other axial side (+Y side) of the first wall portion 23c. The inner diameter of the second wall portion 23d is larger than the inner diameter of the first wall portion 23c. The axial dimension of the second wall portion 23d is larger than the axial dimension of the first wall portion 23c. The third wall portion 23e is connected to the other axial side of the second wall portion 23d. The inner diameter of the third wall portion 23e is larger than the inner diameter of the second wall portion 23d. The axial dimension of the third wall portion 23e is larger than the axial dimension of the second wall portion 23d. A bearing 35 is held on the radial inner side of the third wall portion 23e. The outer ring of the bearing 35 is fitted into the radially inner side of the third wall portion 23e.

[0023] In this embodiment, the inner peripheral surface of the peripheral wall portion 23b has a first step portion 24a and a second step portion 24b. The first step portion 24a is a step provided in the axial direction between the inner peripheral surface of the first wall portion 23c and the inner peripheral surface of the second wall portion 23d. The first step portion 24a has a first step surface 24c facing the other axial side (+Y side). The first step surface 24c is an annular shape centered on the central axis J. The first step surface 24c is a flat surface perpendicular to the axial direction. The second step portion 24b is a step provided in the axial direction between the inner peripheral surface of the second wall portion 23d and the inner peripheral surface of the third wall portion 23e. The second step portion 24b has a second step surface 24d facing the other axial side. The second step surface 24d is an annular shape centered on the central axis J. The second step surface 24d is a flat surface perpendicular to the axial direction. The bearing 35 held in the third wall portion 23e is in contact with the second step surface 24d. Therefore, the bearing 35 can be appropriately positioned in the axial direction with respect to the motor housing 20. More specifically, the outer ring of the bearing 35 is in contact with the second step surface 24d from the other axial side.

[0024] A resolver holding portion 25 is provided on the surface of the other axial side (+Y side) of the cover portion 23. In this embodiment, the resolver holding portion 25 is configured by a plurality of protruding wall portions 25a that protrude to the other axial side. The plurality of protruding wall portions 25a are provided on the periphery of the hole portion 23f on the surface of the other axial side of the cover portion 23. The plurality of protruding wall portions 25a are arranged to surround the shaft 31.

[0025] 1, the rotor 30 has a shaft 31 and a rotor body 32. Although not shown, the rotor body 32 has a rotor core and a rotor magnet fixed to the rotor core. Torque of the rotor 30 is transmitted to a transmission device 60.

[0026] The shaft 31 is rotatable about a central axis J. The shaft 31 is rotatably supported by bearings 34, 35. The shaft 31 is a hollow shaft. The shaft 31 is cylindrical and extends in the axial direction about the central axis J. The shaft 31 is provided with a hole 33 that connects the inside of the shaft 31 to the outside of the shaft 31. The shaft 31 extends across the inside of the motor housing 20 and the inside of the gear housing 61. An end of the shaft 31 on the other axial side (+Y side) protrudes into the inside of the gear housing 61. A reduction gear 62 is connected to the end of the shaft 31 on the other axial side.

[0027] The shaft 31 is open on both sides in the axial direction. As shown in FIG. 2, the shaft 31 has an open end 31d that opens to one axial side (-Y side). The shaft 31 has a first shaft portion 31a, a second shaft portion 31b, and a third shaft portion 31c. The second shaft portion 31b is connected to one axial side of the first shaft portion 31a. The outer diameter of the second shaft portion 31b is smaller than the outer diameter of the first shaft portion 31a. The third shaft portion 31c is connected to one axial side of the second shaft portion 31b. The outer diameter of the third shaft portion 31c is smaller than the outer diameter of the second shaft portion 31b. The axial dimension of the third shaft portion 31c is smaller than the axial dimension of the second shaft portion 31b. The end portion on one axial side of the third shaft portion 31c is the end portion on one axial side of the shaft 31, and is the open end portion 31d.

[0028] The inner diameter of the first shaft portion 31a, the inner diameter of the second shaft portion 31b, and the inner diameter of the third shaft portion 31c are the same. A step portion having a step surface facing one axial side (-Y side) is provided between the outer peripheral surface of the first shaft portion 31a and the outer peripheral surface of the second shaft portion 31b. A step portion having a step surface facing one axial side is provided between the outer peripheral surface of the second shaft portion 31b and the outer peripheral surface of the third shaft portion 31c.

[0029] The second shaft portion 31b at one axial side (-Y side) and the third shaft portion 31c are located radially inside the peripheral wall portion 23b. More specifically, the second shaft portion 31b at one axial side is located radially inside the third wall portion 23e. The third shaft portion 31c is located radially inside the second wall portion 23d and the first wall portion 23c. In this embodiment, the opening end 31d is located radially inside the first wall portion 23c. The outer peripheral surface of the second shaft portion 31b and the outer peripheral surface of the third shaft portion 31c are disposed radially inwardly away from the inner peripheral surface of the peripheral wall portion 23b. The opening end 31d is disposed radially inwardly away from the bottom wall portion 23a (+Y side).

[0030] 1, the stator 40 faces the rotor 30 in the radial direction with a gap therebetween. More specifically, the stator 40 is located radially outside the rotor 30. The stator 40 is fixed inside the motor housing 20. The stator 40 has a stator core 41 and a coil assembly 42.

[0031] The stator core 41 is annular and surrounds the central axis J of the rotating electric machine 10. The stator core 41 is located radially outside the rotor 30. The stator core 41 surrounds the rotor 30. The stator core 41 is formed by, for example, stacking a plurality of plate members such as electromagnetic steel sheets in the axial direction. Although not shown, the stator core 41 has a cylindrical core back extending in the axial direction and a plurality of teeth extending radially inward from the core back.

[0032] The coil assembly 42 has a plurality of coils 42c attached to the stator core 41 along the circumferential direction. The plurality of coils 42c are respectively attached to the teeth of the stator core 41 via insulators (not shown). The coil assembly 42 has coil ends 42a, 42b protruding from the stator core 41 in the axial direction.

[0033] The resolver 50 can detect the rotation of the rotor 30. The resolver 50 is accommodated inside the motor housing 20. The resolver 50 has a resolver rotor 51 and a resolver stator 52. The resolver rotor 51 is fixed to the shaft 31. The resolver rotor 51 is annular and surrounds the shaft 31. In this embodiment, the resolver rotor 51 is annular and centered on the central axis J. As shown in FIG. 2, in this embodiment, the resolver rotor 51 surrounds the end of the second shaft portion 31b on the other axial side (+Y side). The resolver rotor 51 is plate-shaped with the plate surface facing the axial direction. The surface of the resolver rotor 51 on the other axial side is in contact with a step surface of a step portion provided between the first shaft portion 31a and the second shaft portion 31b in the axial direction. The resolver rotor 51 protrudes radially outward from the outer circumferential surface of the first shaft portion 31a. The resolver rotor 51 is disposed on the other axial side of the bearing 35 with a gap therebetween.

[0034] The resolver stator 52 is located radially outside the resolver rotor 51. The resolver stator 52 is annular and surrounds the resolver rotor 51. The resolver stator 52 is held by the resolver holding portion 25. Although not shown, the resolver stator 52 has a coil. When the resolver rotor 51 rotates together with the shaft 31, an induced voltage is generated in the coil of the resolver stator 52 according to the circumferential position of the resolver rotor 51. The resolver 50 can detect the rotation of the resolver rotor 51 and the shaft 31 based on a change in the induced voltage generated in the coil of the resolver stator 52. This allows the resolver 50 to detect the rotation of the rotor 30.

[0035] The static eliminator 80 is located radially inside the peripheral wall portion 23b. The static eliminator 80 is annular and surrounds the shaft 31. In this embodiment, the static eliminator 80 is annular and centered on the central axis J. The static eliminator 80 surrounds the third shaft portion 31c. In this embodiment, the static eliminator 80 is fitted into the radial inside of the second wall portion 23d. The static eliminator 80 is located on the other axial side (+Y side) of the opening end 31d. In other words, the opening end 31d is located on one axial side (-Y side) of the static eliminator 80.

[0036] The static eliminator 80 is located on one axial side (-Y side) of the bearing 35. As a result, the bearing 35 is located axially between the resolver rotor 51 and the static eliminator 80. In this embodiment, the static eliminator 80 faces the bearing 35 with a gap therebetween. The axial distance between the static eliminator 80 and the bearing 35 is smaller than the axial distance between the bearing 35 and the resolver rotor 51. As shown in FIG. 3, the static eliminator 80 has an annular base 81 centered on the central axis J, and a brush portion 82 provided around the entire circumference of the radially inner edge of the base 81.

[0037] 2, the base 81 is fitted to the radially inner side of the second wall portion 23d. The base 81 is fixed to the second wall portion 23d by, for example, an adhesive. This fixes the static eliminator 80 to the motor housing 20. Note that the method for fixing the static eliminator 80 to the motor housing 20 is not particularly limited. The static eliminator 80 may be fixed to the motor housing 20 by, for example, press fitting.

[0038] A surface on one axial side (-Y side) of the radial outer edge of the base 81 contacts the first step surface 24c. This brings the static eliminator 80 into contact with the first step surface 24c. Therefore, the static eliminator 80 can be suitably positioned in the axial direction with respect to the motor housing 20. The base 81 is in electrical contact with the peripheral wall portion 23b. This brings the static eliminator 80 into electrical contact with the motor housing 20. In this specification, "a certain object is in electrical contact with another object" means that a current can flow between the certain object and the other object.

[0039] The brush portion 82 is annular and surrounds the shaft 31. More specifically, the brush portion 82 is annular and surrounds the third shaft portion 31c, centered on the central axis J. In this embodiment, the brush portion 82 is composed of a plurality of conductive fibers protruding radially inward from the radial inner edge of the base portion 81. The fibers constituting the brush portion 82 are, for example, microfibers. The brush portion 82 is electrically connected to the base portion 81. The radial inner edge of the brush portion 82 is in electrical contact with the outer circumferential surface of the third shaft portion 31c. As a result, the static eliminator 80 is in electrical contact with the shaft 31. In this embodiment, the shaft 31 rotates while the outer circumferential surface of the third shaft portion 31c is rubbed against the radial inner edge of the brush portion 82.

[0040] In this manner, the shaft 31 and the motor housing 20 are electrically connected via the static eliminator 80. Therefore, the current generated in the shaft 31 can be passed from the peripheral wall portion 23b to the motor housing 20 via the brush portion 82 and the base portion 81 in this order. This makes it possible to prevent the current from flowing from the shaft 31 to the bearings 34, 35 that rotatably support the shaft 31. Therefore, the occurrence of electrolytic corrosion in the bearings 34, 35 can be suppressed.

[0041] In this embodiment, the static eliminator 80 has excellent oil resistance. That is, the static eliminator 80 is unlikely to undergo changes due to contact with the oil O. The oil resistance can be evaluated by an immersion test in the oil O. In this case, the oil resistance is evaluated based on the weight change and strength change after immersion for a predetermined time. The evaluation of the weight change includes, for example, aspects of corrosion and swelling.

[0042] The nozzle member 70 is a member for supplying oil O as a fluid to the inside of the shaft 31. The nozzle member 70 is made, for example, by subjecting a metal plate member to machining such as press working. The nozzle member 70 is disposed within the peripheral wall portion 23b. The nozzle member 70 has a supply tube portion 71 and a flange portion 72.

[0043] The supply tube portion 71 extends in the axial direction. In this embodiment, the supply tube portion 71 is cylindrical with the central axis J as the center. The supply tube portion 71 opens on both axial sides. At least a part of the supply tube portion 71 is inserted into the inside of the shaft 31 from the open end 31d. In this embodiment, the entire supply tube portion 71 except for the end portion on one axial side (-Y side) is inserted into the inside of the shaft 31. The end portion on one axial side of the supply tube portion 71 is located on the one axial side of the shaft 31. In this embodiment, the outer peripheral surface of the supply tube portion 71 is disposed radially inwardly away from the inner peripheral surface of the shaft 31. Therefore, it is possible to suppress the supply tube portion 71 from rubbing against the shaft 31. This makes it possible to suppress the wear of the supply tube portion 71. The supply tube portion 71 has a large diameter portion 71a, a small diameter portion 71b, and a connection portion 71c. As shown in FIGS. 2 to 4, in this embodiment, the supply tube portion 71 is configured in a funnel shape by a large diameter portion 71a, a small diameter portion 71b, and a connection portion 71c.

[0044] As shown in FIG. 2, the large diameter portion 71a is a portion on one axial side (-Y side) of the supply tube portion 71. The end portion on one axial side of the large diameter portion 71a is the end portion on one axial side of the supply tube portion 71. The large diameter portion 71a has an inserted portion 71d inserted into the shaft 31 and an expanded diameter portion 71e connected to one axial side of the inserted portion 71d. In this embodiment, the inserted portion 71d is located radially inside the third shaft portion 31c. The outer peripheral surface of the inserted portion 71d is disposed away from the inner peripheral surface of the third shaft portion 31c radially inward. The inner diameter and the outer diameter of the inserted portion 71d are the same throughout the axial direction. The inner diameter and the outer diameter of the expanded diameter portion 71e become larger as they move away from the inserted portion 71d to one axial side. As a result, in this embodiment, the inner diameter at the end portion on one axial side of the supply tube portion 71 becomes larger as it moves toward one axial side.

[0045] The inner peripheral surface of the enlarged diameter portion 71e is a tapered surface in which the inner diameter linearly decreases toward the other axial side (+Y side). The outer peripheral surface of the enlarged diameter portion 71e is a tapered surface in which the outer diameter linearly decreases toward the other axial side. In this embodiment, the end of the enlarged diameter portion 71e on one axial side (-Y side) is located radially outward from the inner peripheral surface of the opening end 31d and radially inward from the outer peripheral surface of the opening end 31d. The end of the enlarged diameter portion 71e on one axial side is disposed away from the opening end 31d toward one axial side. The axial dimension of the enlarged diameter portion 71e is smaller than the axial dimension of the inserted portion 71d.

[0046] The small diameter portion 71b is a portion on the other axial side (+Y side) of the supply tube portion 71. The small diameter portion 71b is connected to the other axial side of the large diameter portion 71a. In this embodiment, the small diameter portion 71b is connected to the large diameter portion 71a via a connecting portion 71c. The end portion on the other axial side of the small diameter portion 71b is the end portion on the other axial side of the supply tube portion 71. The inner diameter of the small diameter portion 71b is smaller than the inner diameter of the large diameter portion 71a. The inner diameter of the small diameter portion 71b is, for example, half or less of the inner diameter of the large diameter portion 71a. The outer diameter of the small diameter portion 71b is smaller than the outer diameter of the large diameter portion 71a. The outer diameter of the small diameter portion 71b is, for example, half or less of the outer diameter of the large diameter portion 71a. The axial dimension of the small diameter portion 71b is larger than the axial dimension of the large diameter portion 71a.

[0047] The entire small diameter portion 71b is inserted inside the shaft 31. In this embodiment, the small diameter portion 71b is located radially inside the second shaft portion 31b. The outer peripheral surface of the small diameter portion 71b is located radially inwardly away from the inner peripheral surface of the second shaft portion 31b. The radial distance between the outer peripheral surface of the small diameter portion 71b and the inner peripheral surface of the shaft 31 is greater than the radial distance between the outer peripheral surface of the large diameter portion 71a and the inner peripheral surface of the shaft 31. In this embodiment, the end portion on the other axial side (+Y side) of the small diameter portion 71b is located radially inside the resolver rotor 51.

[0048] The connecting portion 71c expands in the radial direction and connects an end portion on the other axial side (+Y side) of the large diameter portion 71a and an end portion on one axial side (-Y side) of the small diameter portion 71b. In this embodiment, the connecting portion 71c is located on the other axial side as it moves from the radial outside to the radial inside. The connecting portion 71c has a connecting surface 71f facing one axial side. The connecting surface 71f is an annular surface centered on the central axis J. The connecting surface 71f connects the inner peripheral surface of the large diameter portion 71a and the inner peripheral surface of the small diameter portion 71b. More specifically, the connecting surface 71f connects the end portion on the other axial side of the inner peripheral surface of the inserted portion 71d and the end portion on one axial side of the inner peripheral surface of the small diameter portion 71b. The connecting surface 71f is located on the other axial side as it moves from the inner peripheral surface of the large diameter portion 71a to the inner peripheral surface of the small diameter portion 71b. The connecting surface 71f is a tapered surface whose inner diameter linearly decreases toward the other axial side. The inclination of the connecting surface 71f with respect to the axial direction is greater than the inclination of the inner circumferential surface of the expanded diameter portion 71e with respect to the axial direction.

[0049] The flange portion 72 protrudes radially outward from the supply tube portion 71. In this embodiment, the flange portion 72 protrudes radially outward from one axial side (-Y side) of the supply tube portion 71. The flange portion 72 is annular and surrounds the central axis J. In this embodiment, the flange portion 72 is annular and centered on the central axis J.

[0050] The flange portion 72 is located axially between the static eliminator 80 and the bottom wall portion 23a. As a result, the static eliminator 80 is located axially between the bearing 35 and the flange portion 72. The flange portion 72 is disposed facing the other axial side (+Y side) of the bottom wall portion 23a. The flange portion 72 is disposed facing one axial side of the static eliminator 80. The flange portion 72 has an annular portion 72a and a cylindrical portion 72b.

[0051] The annular portion 72a is a portion that protrudes radially outward from the supply tube portion 71. In this embodiment, the annular portion 72a protrudes radially outward from an end portion on one axial side (-Y side) of the expanded diameter portion 71e. The annular portion 72a is in the shape of a ring centered on the central axis J. The annular portion 72a is in the shape of a plate with a plate surface facing the axial direction. The annular portion 72a has an inner annular portion 72c and an outer annular portion 72d.

[0052] The inner annular portion 72c is a radially inner portion of the annular portion 72a. The radially inner edge of the inner annular portion 72c is connected to an end portion on one axial side (-Y side) of the expanded diameter portion 71e. The radially outer edge of the inner annular portion 72c is located radially outward from the outer circumferential surface of the second shaft portion 31b. The surface on one axial side of the inner annular portion 72c is a flat surface 72e that constitutes a part of the surface on one axial side of the flange portion 72. The flat surface 72e is perpendicular to the axial direction. As shown in FIG. 3, the flat surface 72e is annular about the central axis J.

[0053] The outer annular portion 72d is a radially outer portion of the annular portion 72a. The outer annular portion 72d is connected to the radially outer side of the inner annular portion 72c. The outer annular portion 72d is located on the other axial side (+Y side) as it moves from the radially outer edge of the inner annular portion 72c to the radially outer side. The surface on one axial side (-Y side) of the outer annular portion 72d is an inclined surface 72f that constitutes a part of the surface on one axial side of the flange portion 72. That is, the surface on one axial side of the flange portion 72 has an inclined surface 72f. In this embodiment, the surface on one axial side of the flange portion 72 is composed of a flat surface 72e and an inclined surface 72f. The inclined surface 72f is located on the other axial side as it moves radially outward. The inclined surface 72f is an annular shape centered on the central axis J. The inclined surface 72f is a tapered surface whose outer diameter linearly decreases as it moves toward one axial side.

[0054] As shown in FIG. 2, the cylindrical portion 72b protrudes from the radial outer edge of the annular portion 72a toward the other axial side (+Y side). The cylindrical portion 72b is cylindrical and centered on the central axis J. The cylindrical portion 72b is gap-fitted into the radial inner side of the first wall portion 23c. As a result, in this embodiment, the flange portion 72 is fitted into the inside of the peripheral wall portion 23b. Therefore, the nozzle member 70 can be radially positioned with respect to the motor housing 20. In this embodiment, the cylindrical portion 72b protruding in the axial direction from the radial outer edge of the annular portion 72a is provided, and therefore the nozzle member 70 can be more suitably positioned in the radial direction with respect to the motor housing 20 by fitting the cylindrical portion 72b into the inside of the peripheral wall portion 23b.

[0055] The other axial end of the cylindrical portion 72b is located on the other axial side of the opening end 31d. The other axial end of the cylindrical portion 72b surrounds the opening end 31d. That is, in this embodiment, the opening end 31d is located radially inside the cylindrical portion 72b. The cylindrical portion 72b is disposed facing the static eliminator 80 in the axial direction. In the example of FIG. 2, the other axial end of the cylindrical portion 72b contacts a surface of the base portion 81 on one axial side (-Y side).

[0056] The axial dimension L1 of the flange portion 72 is smaller than the axial distance L2 between the bottom wall portion 23a and the static eliminator 80. Therefore, the flange portion 72 is disposed away from at least one of the bottom wall portion 23a and the static eliminator 80 in the axial direction. In the example of FIG. 2, the flange portion 72 is disposed away from the bottom wall portion 23a on the other axial side (+Y side) and is in contact with the static eliminator 80. In this embodiment, the nozzle member 70 is movable in the axial direction within a range in which the flange portion 72 can move between the bottom wall portion 23a and the static eliminator 80 in the axial direction. The axial dimension L1 of the flange portion 72 is the axial distance between the flat surface 72e and the end portion of the cylindrical portion 72b on the other axial side. The axial distance L2 between the bottom wall portion 23a and the static eliminator 80 is the axial distance between the surface of the bottom wall portion 23a on the other axial side and the surface of the base portion 81 on one axial side (-Y side). In this embodiment, the axial distance L2 between the bottom wall portion 23a and the static eliminator 80 is the same as the axial dimension of the first wall portion 23c.

[0057] In this embodiment, a gap G is provided between the flange portion 72 and the bottom wall portion 23a in the axial direction. The gap G includes a gap G1 between the flat surface 72e and the surface of the bottom wall portion 23a on the other axial side (+Y side), and a gap G2 between the inclined surface 72f and the surface of the bottom wall portion 23a on the other axial side. The gap G2 is larger than the gap G1. When the nozzle member 70 moves toward one axial side (-Y side) from the position shown in FIG. 2 and the flat surface 72e comes into contact with the surface of the bottom wall portion 23a on the other axial side, only the gap G2 is provided between the flange portion 72 and the bottom wall portion 23a in the axial direction. In this way, by providing the inclined surface 72f, even when the flange portion 72 comes into contact with the bottom wall portion 23a, the gap G2 can be provided between the flange portion 72 and the bottom wall portion 23a in the axial direction.

[0058] In this embodiment, the flange portion 72 has at least one supply hole 73 that supplies oil O as a fluid to the bearing 35. Therefore, the oil O as a lubricant can be supplied to the bearing 35 through the supply hole 73. In this embodiment, the supply hole 73 is a hole that penetrates the flange portion 72 in the axial direction. In this embodiment, the supply hole 73 is provided in the outer annular portion 72d. The supply hole 73 opens to the inclined surface 72f. The supply hole 73 opens to a gap G between the flange portion 72 and the bottom wall portion 23a. More specifically, the supply hole 73 opens to a gap G2 between the inclined surface 72f and a surface on the other axial side (+Y side) of the bottom wall portion 23a. The supply hole 73 opens between the static eliminator 80 and the flange portion 72. As shown in FIG. 3 and FIG. 4, in this embodiment, the supply hole 73 is a circular hole. A plurality of supply holes 73 are provided at intervals in the circumferential direction. The supply holes 73 are arranged at equal intervals around the circumference in the circumferential direction. For example, four supply holes 73 are provided.

[0059] As shown in FIG. 1, in this embodiment, the drive unit 100 is provided with a refrigerant flow path 90 in which oil O circulates as a refrigerant. The refrigerant flow path 90 is provided across the interior of the motor housing 20 and the interior of the gear housing 61. The refrigerant flow path 90 is a path through which the oil O stored in the gear housing 61 is supplied to the rotating electric machine 10 and returns to the gear housing 61. The refrigerant flow path 90 is provided with a pump 96, a cooler 97, and a refrigerant supply unit 95. In the following description, the upstream side in the flow direction of the oil O in the refrigerant flow path 90 is simply referred to as the "upstream side", and the downstream side in the flow direction of the oil O in the refrigerant flow path 90 is simply referred to as the "downstream side". The refrigerant flow path 90 has a gear side flow path portion 91, a connection flow path portion 92, and a rotating electric machine side flow path portion 93.

[0060] The gear side flow passage portion 91 has a first portion 91a and a second portion 91b. The first portion 91a and the second portion 91b are provided, for example, on a wall portion of the gear housing 61. The first portion 91a connects a portion of the inside of the gear housing 61 in which the oil O is stored and the pump 96. The second portion 91b connects the pump 96 and the cooler 97.

[0061] The connection flow path portion 92 is provided across a wall portion of the gear housing 61 and a wall portion of the motor housing 20. The connection flow path portion 92 connects the gear side flow path portion 91 and the rotating electric machine side flow path portion 93. More specifically, the connection flow path portion 92 connects the cooler 97 and a third flow path portion 93c described later.

[0062] The rotating electric machine side flow passage portion 93 is provided in the rotating electric machine 10. The rotating electric machine side flow passage portion 93 has a first flow passage portion 93a, a second flow passage portion 93b, and a third flow passage portion 93c. That is, the rotating electric machine 10 includes the first flow passage portion 93a, the second flow passage portion 93b, and the third flow passage portion 93c. The first flow passage portion 93a and the third flow passage portion 93c are provided in the wall portion of the motor housing 20. The second flow passage portion 93b has a housing flow passage portion 93d provided in the wall portion of the motor housing 20, and a refrigerant supply portion 95. In this embodiment, the first flow passage portion 93a, the third flow passage portion 93c, and the housing flow passage portion 93d are provided in the cover portion 23. The first flow passage portion 93a and the second flow passage portion 93b are connected to the third flow passage portion 93c. In this embodiment, the first flow path portion 93a and the second flow path portion 93b branch off from the third flow path portion 93c.

[0063] The first flow passage portion 93a is a flow passage portion that supplies oil O as a fluid to the inside of the peripheral wall portion 23b. An upstream end of the first flow passage portion 93a is connected to a downstream end of the third flow passage portion 93c. A downstream end of the first flow passage portion 93a opens into the inside of the peripheral wall portion 23b. Although not shown in the drawings, the downstream end of the first flow passage portion 93a opens, for example, to an end of the inner circumferential surface of the peripheral wall portion 23b on one axial side (-Y side).

[0064] The second flow path portion 93b is a flow path portion that supplies oil O as a fluid to the stator 40. An upstream end of the housing flow path portion 93d of the second flow path portion 93b is connected to a downstream end of the third flow path portion 93c. A downstream end of the housing flow path portion 93d is connected to an upstream end of the refrigerant supply portion 95.

[0065] In this embodiment, the refrigerant supply unit 95 is tubular and extends in the axial direction. In other words, in this embodiment, the refrigerant supply unit 95 is a pipe that extends in the axial direction. Both axial end portions of the refrigerant supply unit 95 are supported by the motor housing 20. An end portion on the other axial side (+Y side) of the refrigerant supply unit 95 is supported by, for example, the partition wall portion 22. An end portion on one axial side (-Y side) of the refrigerant supply unit 95 is supported by, for example, the lid portion 23.

[0066] The refrigerant supply unit 95 is located radially outside the stator 40. In this embodiment, the refrigerant supply unit 95 is located above the stator 40. In this embodiment, the flow direction of the oil O in the refrigerant supply unit 95 is from one axial side to the other axial side. That is, in the flow direction of the oil O in the refrigerant supply unit 95, the one axial side is the upstream side, and the other axial side is the downstream side. The refrigerant supply unit 95 has a supply port 95a that supplies the oil O as a refrigerant to the stator 40. In this embodiment, the supply port 95a is an injection port that injects a portion of the oil O that has flowed into the refrigerant supply unit 95 to the outside of the refrigerant supply unit 95. A plurality of supply ports 95a are provided.

[0067] When the pump 96 is driven, the oil O stored in the gear housing 61 is sucked up through the first portion 91a and flows into the cooler 97 through the second portion 91b. The oil O that flows into the cooler 97 is cooled in the cooler 97, and then flows through the connecting flow path portion 92 and into the rotary electric machine side flow path portion 93 from the third flow path portion 93c. The oil O that flows into the third flow path portion 93c branches into the first flow path portion 93a and the second flow path portion 93b. The oil O that flows into the first flow path portion 93a flows into the inside of the peripheral wall portion 23b. In this embodiment, the oil O from the first flow path portion 93a flows into the axial gap G between the flange portion 72 and the bottom wall portion 23a. More specifically, the oil O from the first flow path portion 93a flows into the axial gap G2 between the inclined surface 72f and the bottom wall portion 23a.

[0068] As shown in FIG. 2, a part of the oil O that has flowed into the inside of the peripheral wall portion 23b flows into the inside of the shaft 31 through the inside of the supply tube portion 71 of the nozzle member 70. In this manner, in this embodiment, the first flow path portion 93a is provided, so that the oil O can be supplied from inside the peripheral wall portion 23b into the inside of the shaft 31. In this embodiment, the oil O that has flowed into the gap G2 flows into the supply tube portion 71 from the end portion on one axial side (-Y side) of the supply tube portion 71 through the gap G1. Here, in this embodiment, since the axial dimension L1 of the flange portion 72 is smaller than the axial distance L2 between the bottom wall portion 23a and the static electricity removal device 80, the gap G1 can be suitably generated. As a result, even when the oil O is supplied from the first flow path portion 93a to the gap G2 as in this embodiment, the oil O can be easily supplied into the supply tube portion 71 through the gap G1. Also, in this embodiment, the inner diameter at the end portion on one axial side of the supply tube portion 71 becomes larger toward the one axial side. Therefore, the oil O can be easily caused to flow into the supply tube portion 71 from one axial end of the supply tube portion 71. This makes it easier to supply the oil O into the supply tube portion 71.

[0069] 1, the oil O that flows into the shaft 31 from the nozzle member 70 passes through the inside of the rotor body 32 from the hole portion 33, and is splashed onto the stator 40. As shown in Fig. 2, another portion of the oil O that flows into the inside of the peripheral wall portion 23b passes through the supply hole 73 from one axial side (-Y side) to the other axial side (+Y side), and is supplied to the bearing 35.

[0070] Here, in this embodiment, the supply hole 73 opens into the gap G between the flange portion 72 and the bottom wall portion 23a. Therefore, the oil O that flows into the gap G can easily pass through the supply hole 73. This makes it possible to easily supply the oil O to the bearing 35 through the supply hole 73. Also, in this embodiment, the supply hole 73 opens into the inclined surface 72f. Therefore, even when the flange portion 72 contacts the bottom wall portion 23a, the oil O can easily flow into the supply hole 73 from the axial gap G2 between the inclined surface 72f and the bottom wall portion 23a. This makes it possible to more easily supply the oil O to the bearing 35 through the supply hole 73.

[0071] The oil O supplied to the bearing 35 passes through the supply hole 73, for example, and then passes through a radial gap between the static eliminator 80 and the shaft 31 to reach the bearing 35. Note that a portion of the oil O that has flowed into the peripheral wall portion 23b may pass through the supply hole 73 from one axial side to the other axial side, and then flow into the shaft 31 from the radial gap between the shaft 31 and the supply tube portion 71.

[0072] 1, the oil O that has flowed into the second flow path portion 93b passes through the housing flow path portion 93d and flows into the inside of the refrigerant supply portion 95. The oil O that has flowed into the refrigerant supply portion 95 is sprayed from the supply port 95a and supplied to the stator 40. In this manner, by providing the first flow path portion 93a and the second flow path portion 93b branching off from the third flow path portion 93c, the oil O sent from inside the gear housing 61 can be suitably and easily supplied into the shaft 31 through the circumferential wall portion 23b and can also be supplied from the refrigerant supply portion 95 to the stator 40.

[0073] In this embodiment, a portion of the oil O scooped up by the ring gear 63a enters a reservoir 98 provided in the gear housing 61. The oil O that enters the reservoir 98 flows into the shaft 31 from the end on the other axial side (+Y side). The oil O that flows from the reservoir 98 into the shaft 31 passes through the inside of the rotor body 32 from the hole 33, and splashes onto the stator 40.

[0074] The oil O supplied to the stator 40 from the supply port 95a and the oil O supplied to the stator 40 from within the shaft 31 remove heat from the stator 40. After cooling the stator 40, the oil O drops downward and accumulates in the lower region within the motor housing 20. The oil O that has accumulated in the lower region within the motor housing 20 returns to the gear housing 61 via the partition opening 22a provided in the partition portion 22. In this manner, the refrigerant flow path 90 supplies the oil O stored in the gear housing 61 to the rotor 30 and the stator 40.

[0075] According to this embodiment, the flange portion 72 is located between the static eliminator 80 fixed to the motor housing 20 and the bottom wall portion 23a in the axial direction. Therefore, the flange portion 72 can be pressed from one axial side by the bottom wall portion 23a, and the flange portion 72 can be pressed from the other axial side by the static eliminator 80. That is, the static eliminator 80 can suppress the nozzle member 70 from moving in the axial direction relative to the motor housing 20. Therefore, by fixing the static eliminator 80 to the motor housing 20, the nozzle member 70 can be attached to the motor housing 20. Therefore, there is no need to provide a fixing member for fixing the nozzle member 70 to the motor housing 20 other than the static eliminator 80, and the number of parts of the rotating electric machine 10 can be reduced. This also reduces the number of parts of the drive device 100. By reducing the number of parts of the rotating electric machine 10 and the drive device 100, the man-hours and time required for assembling the rotating electric machine 10 and the drive device 100 can be reduced.

[0076] Furthermore, according to this embodiment, the static eliminator 80 is located between the bearing 35 and the flange portion 72 in the axial direction. Therefore, even if the static eliminator 80 comes off from the motor housing 20, the bearing 35 can prevent the static eliminator 80 from moving to the other axial side. As a result, even if the static eliminator 80 comes off from the motor housing 20, the static eliminator 80 can prevent the flange portion 72 from moving to the other axial side.

[0077] Furthermore, according to this embodiment, the bearing 35 is located axially between the resolver rotor 51 and the static eliminator 80. Therefore, the bearing 35 can be disposed closer to the static eliminator 80 than when the resolver rotor 51 is provided axially between the bearing 35 and the static eliminator 80. This makes it easier for the oil O to reach the bearing 35 from the supply hole 73 of the nozzle member 70 in a configuration in which the oil O is supplied to the bearing 35 from the supply hole 73 of the nozzle member 70 as in this embodiment.

[0078] Furthermore, according to this embodiment, the opening end 31d is located on one axial side (-Y side) of the static eliminator 80 and radially inside the cylindrical portion 72b. Therefore, by extending the shaft 31 to one axial side of the static eliminator 80, it is possible to easily bring the static eliminator 80 into contact with the shaft 31, while by arranging the portion of the shaft 31 that extends to one axial side of the static eliminator 80 inside the cylindrical portion 72b, it is possible to prevent the entire rotating electric machine 10 from becoming large in the axial direction.

[0079] According to the present embodiment, the supply tube portion 71 has a large diameter portion 71a and a small diameter portion 71b that is connected to the other axial side (+Y side) of the large diameter portion 71a and has an inner diameter smaller than that of the large diameter portion 71a. In this manner, by providing the small diameter portion 71b in the supply tube portion 71 and thinning a part of the supply tube portion 71, it is possible to prevent the oil O from flowing too much into the shaft 31 from the supply tube portion 71. This makes it easier to supply a part of the oil O that has flowed into the peripheral wall portion 23b from the supply hole 73 to the bearing 35. Also, it is possible to prevent the total amount of oil O flowing from the first flow passage portion 93a into the peripheral wall portion 23b from becoming too large. Therefore, it is possible to prevent the amount of oil O branching from the third flow passage portion 93c to the first flow passage portion 93a from becoming too large, and it is possible to prevent the amount of oil O branching from the third flow passage portion 93c to the second flow passage portion 93b from becoming too small. This makes it possible to suitably supply the oil O from the second flow passage portion 93b to the stator 40. Furthermore, the oil O can be stored in the large diameter portion 71a, and the oil O stored in the large diameter portion 71a can be stably supplied to the inside of the shaft 31 successively from the small diameter portion 71b.

[0080] According to this embodiment, the connecting portion 71c connecting the end of the large diameter portion 71a on the other axial side (+Y side) and the end of the small diameter portion 71b on one axial side (-Y side) has a connecting surface 71f located on the other axial side from the inner peripheral surface of the large diameter portion 71a toward the inner peripheral surface of the small diameter portion 71b. This makes it easier for the oil O that has flowed into the large diameter portion 71a to flow into the small diameter portion 71b along the connecting surface 71f. This makes it easier to supply the oil O from the small diameter portion 71b into the shaft 31.

[0081] <Second embodiment> 5, in the rotating electric machine 210 of the drive device 200 of this embodiment, a first flow passage portion 293a is opened at the radial center of a bottom wall portion 223a. Unlike the first embodiment, a first wall portion 23c is not provided on a peripheral wall portion 223b. In this embodiment, a second wall portion 23d is connected to the bottom wall portion 223a.

[0082] In the supply tube portion 271 of the nozzle member 270, the inner diameter and the outer diameter of the large diameter portion 271a are the same throughout the axial direction. The flange portion 272 protrudes radially outward from an end portion on one axial side (-Y side) of the large diameter portion 271a. In this embodiment, the flange portion 272 is plate-shaped having a flat plate surface perpendicular to the axial direction. Unlike the flange portion 72 of the first embodiment, the flange portion 272 does not have the tube portion 72b. The surface on one axial side of the flange portion 272 contacts the surface on the other axial side (+Y side) of the bottom wall portion 223a.

[0083] A surface on one axial side (-Y side) of the base 281 of the static eliminator 280 contacts a surface on the other axial side (+Y side) of the flange portion 272. As a result, the flange portion 272 contacts both the bottom wall portion 223a and the static eliminator 280 in the axial direction. Therefore, the static eliminator 280 can more suitably suppress the nozzle member 270 from moving to the other axial side. In this manner, in this embodiment, the static eliminator 280 can more stably attach the nozzle member 270 to the motor housing 220. Also, the nozzle member 270 can be suppressed from rattling in the axial direction. Therefore, noise generated from the rotating electric machine 210 can be suppressed.

[0084] In this embodiment, the static eliminator 280 is positioned in the axial direction with respect to the motor housing 220 by contacting the other axial side surface of the flange portion 272. Unlike the first embodiment, no gap is provided between the flange portion 272 and the bottom wall portion 223a in the axial direction. Unlike the flange portion 72 of the first embodiment, the flange portion 272 does not have a supply hole 73. The radial outer edge portion of the flange portion 272 is spaced radially inward from the inner circumferential surface of the peripheral wall portion 223b.

[0085] In this embodiment, an open end 231d of a third shaft portion 231c of the shaft 231 is located on the other axial side (+Y side) of the end portion on one axial side (-Y side) of the static eliminator 280. The open end 231d is disposed facing the other axial side of the flange portion 272 with a gap therebetween. Other configurations of the rotating electric machine 210 can be similar to other configurations of the rotating electric machine 10 of the first embodiment. Other configurations of the drive device 200 can be similar to other configurations of the drive device 100 of the first embodiment.

[0086] The present invention is not limited to the above-described embodiment, and other configurations and methods may be adopted within the scope of the technical concept of the present invention. The static eliminator may be of any type as long as it is in electrical contact with the shaft and the housing of the rotating electrical machine and can release the current flowing through the shaft to the housing.

[0087] The nozzle member may have any shape as long as it has a supply tube portion and a flange portion. The tube portion of the nozzle member may protrude from the radial outer edge portion of the annular portion to one side in the axial direction. The inner diameter of the supply tube portion may be the same throughout the axial direction. The outer peripheral surface of the supply tube portion may be in contact with the inner peripheral surface of the shaft. The fluid supplied from the nozzle member to the inside of the shaft may be any type of fluid. The fluid may be an insulating liquid or water. When the fluid is water, an insulating treatment may be applied to the surface of the stator. The structure and method for supplying the fluid into the peripheral wall portion are not particularly limited. The arrangement of the resolver and the arrangement of the bearings are not particularly limited.

[0088] The rotating electric machine to which the present invention is applied is not limited to a motor, and may be a generator. The use of the rotating electric machine is not particularly limited. For example, the rotating electric machine may be mounted on a vehicle for a purpose other than rotating an axle, or may be mounted on equipment other than a vehicle. The attitude of the rotating electric machine when used is not particularly limited. The central axis of the rotating electric machine may extend in the vertical direction. The configurations and methods described in this specification above can be combined as appropriate within a range that does not contradict each other. [Explanation of symbols]

[0089] Reference Signs List 10,210... rotating electric machine, 20,220... motor housing (housing), 23a,223a... bottom wall portion, 23b,223b... peripheral wall portion, 24a... first step portion, 24b... second step portion, 24c... first step surface, 24d... second step surface, 30... rotor, 31,231... shaft, 31d,231d... opening end portion, 35... bearing, 40... stator, 50... resolver, 51... resolver rotor, 52... resolver stator, 60... transmission device, 64... wheel Shaft, 70, 270... nozzle member, 71, 271... supply tube portion, 71a, 271a... large diameter portion, 71b... small diameter portion, 71c... connection portion, 71f... connection surface, 72, 272... flange portion, 72a... annular portion, 72b... cylindrical portion, 72f... inclined surface, 73... supply hole, 80, 280... static eliminator, 93a, 293a... first flow path portion, 93b... second flow path portion, 93c... third flow path portion, 100, 200... drive device, G, G1, G2... gap, J... central axis, O... oil (fluid)

Claims

1. A rotor having a hollow shaft rotatable about a central axis; a stator facing the rotor with a gap therebetween; a housing that accommodates the rotor and the stator therein; a bearing that rotatably supports the rotor; a static eliminator fixed to the housing and in electrical contact with the shaft and the housing; a nozzle member for supplying a fluid to an interior of the shaft; Equipped with The shaft has an open end portion that opens to one side in the axial direction, The housing includes: a bottom wall portion located on one axial side of the opening end portion; a peripheral wall portion that protrudes from the bottom wall portion toward the other axial direction and surrounds the opening end portion; having The nozzle member is a supply tube portion at least a portion of which is inserted into the shaft from the open end; a flange portion protruding radially outward from the supply tube portion; having The static eliminator is located radially inside the peripheral wall portion, The flange portion is located axially between the static eliminator and the bottom wall portion.

2. The inner peripheral surface of the peripheral wall portion has a first step portion having a first step surface facing the other axial direction, The rotating electric machine according to claim 1 , wherein the static eliminator is in contact with the first step surface.

3. The rotating electric machine according to claim 1 , wherein the static eliminator is located axially between the bearing and the flange portion.

4. A resolver capable of detecting the rotation of the rotor is further provided. The resolver includes: A resolver rotor fixed to the shaft; A resolver stator located radially outside the resolver rotor; having The rotating electric machine according to claim 3 , wherein the bearing is located axially between the resolver rotor and the static eliminator.

5. an inner circumferential surface of the peripheral wall portion has a second step portion having a second step surface facing the other axial direction; The rotating electric machine according to claim 3 , wherein the bearing is in contact with the second step surface.

6. The rotating electric machine according to claim 1 , wherein the flange portion has at least one supply hole for supplying the fluid to the bearing.

7. A gap is provided between the flange portion and the bottom wall portion in the axial direction, The rotating electric machine according to claim 6 , wherein the supply hole is open into the gap.

8. The surface of the flange portion on one axial side has an inclined surface that is positioned on the other axial side as it extends radially outward, The rotating electric machine according to claim 6 , wherein the supply hole is open to the inclined surface.

9. The rotating electric machine according to claim 1 , wherein the flange portion is fitted inside the peripheral wall portion.

10. The flange portion is an annular portion protruding radially outward from the supply tube portion; a cylindrical portion protruding in an axial direction from a radial outer edge portion of the annular portion; The rotating electric machine according to claim 1 , further comprising:

11. the cylindrical portion protrudes from a radial outer edge portion of the annular portion toward the other axial direction and is disposed opposite the static eliminator in the axial direction, The rotating electric machine according to claim 10 , wherein the opening end is located on one axial side of the static eliminator and radially inward of the cylindrical portion.

12. The supply tube portion is A large diameter portion; a small diameter portion connected to the other axial side of the large diameter portion and having an inner diameter smaller than that of the large diameter portion; The rotating electric machine according to claim 1 , further comprising:

13. the supply tube portion has a connection portion that extends radially and connects an end portion on the other axial side of the large diameter portion and an end portion on the one axial side of the small diameter portion, the connecting portion has a connecting surface facing one axial direction and connecting an inner circumferential surface of the large diameter portion and an inner circumferential surface of the small diameter portion, The rotating electric machine according to claim 12 , wherein the connection surface is positioned on the other axial side as it moves from the inner circumferential surface of the large diameter portion to the inner circumferential surface of the small diameter portion.

14. The rotating electric machine according to claim 1 , wherein an outer circumferential surface of the supply tube portion is disposed radially inwardly and spaced apart from an inner circumferential surface of the shaft.

15. The rotating electric machine according to claim 1 , wherein an inner diameter of the supply tube portion at one axial end portion increases toward the one axial end portion.

16. The rotating electric machine according to claim 1 , wherein an axial dimension of the flange portion is smaller than an axial distance between the bottom wall portion and the static eliminator.

17. The rotating electric machine according to claim 1 , wherein the flange portion is in axial contact with both the bottom wall portion and the static eliminator.

18. The rotating electric machine according to claim 1 , further comprising a first flow passage portion that supplies the fluid to an inside of the peripheral wall portion.

19. a second flow path portion that supplies the fluid to the stator; a third flow path portion connecting the first flow path portion and the second flow path portion; Further equipped with The rotating electric machine according to claim 18 , wherein the first flow path portion and the second flow path portion branch off from the third flow path portion.

20. A drive device mounted on a vehicle, A rotating electric machine according to any one of claims 1 to 19, a transmission device connected to the rotating electric machine and configured to transmit rotation of the rotating electric machine to an axle of the vehicle; A drive device comprising:

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