Rotating electric machine and drive device

Abstract

Provided is a rotary electric machine and a driving device. The rotary electric machine includes a rotor having a hollow shaft, a housing, a de-electrification device 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 portion that is open on one axial side. The housing has a bottom wall portion on the one axial side of the open end portion and a peripheral wall portion that protrudes from the bottom wall portion toward the other axial side and surrounds the open end portion. The nozzle member has a supply cylinder portion into which at least a portion of the open end portion is inserted into the inside of the shaft and a flange portion that protrudes from the supply cylinder portion toward the radial outside. The de-electrification device is located on the radial inside of the peripheral wall portion, and the flange portion is located between the de-electrification device and the bottom wall portion in the axial direction.

Description

Technical Field

[0001] This invention relates to rotary electric motors and drive devices. Background Technology

[0002] A charge release device for releasing charge from the shaft of a rotating electric machine is known. For example, Patent Document 1 describes a current shunt ring having a conductive section in contact with the shaft.

[0003] [Existing Technical Documents]

[0004] [Patent Literature]

[0005] Patent Document 1: Japanese Patent No. 6163480

[0006] In rotary motors that include charge release devices as described above, for purposes such as cooling, a nozzle component for supplying fluid is sometimes installed inside a hollow shaft. In such rotary motors, fixing components are required to separately secure the charge release device and the nozzle component, resulting in an increase in the number of parts in the rotary motor. Summary of the Invention

[0007] In view of the above, one of the objectives of the present invention is to provide a rotary motor and drive device having a structure that can reduce the number of parts.

[0008] One embodiment of the rotary electric motor of the present invention includes: a rotor having a hollow shaft rotatable about a central axis; a stator opposite the rotor with a clearance; a housing housing the rotor and the stator; a bearing supporting the rotor for rotation; an electrostatic eliminator fixed to the housing and in electrical contact with the shaft and the housing; and a nozzle assembly supplying fluid to the interior of the shaft. The shaft has an open end portion opening on one axial side. The housing has: a bottom wall portion located on one axial side of the open end portion; and a peripheral wall portion projecting from the bottom wall portion to the other axial side and surrounding the open end portion. The nozzle assembly has: a supply cylinder portion at least partially inserted into the interior of the shaft from the open end portion; and a flange portion projecting radially outward from the supply cylinder portion. The electrostatic eliminator is located radially inward of the peripheral wall portion. The flange portion is located axially between the electrostatic eliminator and the bottom wall portion.

[0009] One embodiment of the drive device of the present invention is a drive device installed in a vehicle, comprising: the aforementioned rotary motor; and a transmission device connected to the rotary motor to transmit the rotation of the rotary motor to the axle of the vehicle.

[0010] According to one aspect of the present invention, the number of parts in a rotary electric motor and the number of parts in a drive device can be reduced. Attached Figure Description

[0011] Figure 1 This is a schematic structural diagram of the drive device according to the first embodiment.

[0012] Figure 2 This is a cross-sectional view showing a portion of the rotary motor according to the first embodiment.

[0013] Figure 3 This is an exploded perspective view showing the electrostatic removal device and nozzle components of the first embodiment.

[0014] Figure 4 This is a perspective view showing the nozzle component of the first embodiment.

[0015] Figure 5 This is a cross-sectional view showing a portion of the rotary motor according to the second embodiment.

[0016] (Symbol Explanation)

[0017] 10, 210… Rotary motors;

[0018] 20, 220… Motor housing (casing);

[0019] 23a, 223a… Bottom wall portion;

[0020] 23b, 223b… Peripheral wall portion;

[0021] 24a…First step section;

[0022] 24b…Second step;

[0023] 24c…First step surface;

[0024] 24d…second step surface;

[0025] 30… rotor;

[0026] 31, 231… axis;

[0027] 31d, 231d… opening ends;

[0028] 35…bearings;

[0029] 40…Stator;

[0030] 50… resolver;

[0031] 51…Resolver rotor;

[0032] 52…Resolver stator;

[0033] 60…transmission device;

[0034] 64… axles;

[0035] 70, 270… Nozzle components;

[0036] 71, 271… supply cylinder section;

[0037] 71a, 271a...large diameter part;

[0038] 71b…small diameter section;

[0039] 71c…Connecting part;

[0040] 71f…Connecting surface;

[0041] 72, 272… flange portion;

[0042] 72a… Annular portion;

[0043] 72b...cylindrical part;

[0044] 72f… Inclined surface;

[0045] 73…supply hole;

[0046] 80, 280… Electrostatic removal devices;

[0047] 93a, 293a...the first flow path part;

[0048] 93b…Second flow path section;

[0049] 93c…Third flow path section;

[0050] 100, 200… drive units;

[0051] G, G1, G2… gaps;

[0052] J…Central axis;

[0053] O… Oil (fluid). Detailed Implementation

[0054] In the following description, the vertical direction is defined based on the positional relationship of the drive unit of the embodiment when it is installed on a vehicle located on a horizontal road surface. That is, the relative positional relationship related to the vertical direction described in the following embodiments is sufficient at least when the drive unit is installed on a vehicle located on a horizontal road surface.

[0055] In the accompanying drawings, the XYZ coordinate system is appropriately represented as a three-dimensional Cartesian coordinate system. In the XYZ coordinate system, the Z-axis direction is the vertical direction. The side to which the Z-axis arrow points (+Z side) is the upper vertical direction, and the opposite side (-Z side) is the lower vertical direction. In the following description, the upper vertical direction is simply referred to as the "upper side," and the lower vertical direction is simply referred to as the "lower side." The X-axis direction is orthogonal to the Z-axis direction and represents the front-rear direction of the vehicle equipped with the drive unit. In the following embodiments, the side to which the X-axis arrow points (+X side) is the front side of the vehicle, and the opposite side (-X side) is the rear side of the vehicle. The Y-axis direction is orthogonal to both the X-axis and Z-axis directions and represents the left-right direction of the vehicle, i.e., the vehicle width direction. In the following embodiments, the side to which the Y-axis arrow points (+Y side) is the left side of the vehicle, and the opposite side (-Y side) is the right side of the vehicle. The front-back and left-right directions are horizontal directions orthogonal to the vertical direction.

[0056] Furthermore, the front-to-back positional relationship is not limited to the positional relationship described in the following embodiment. It can also be that the side towards which the arrow on the X-axis points (+X side) is the rear of the vehicle, and the opposite side (-X side) is the front of the vehicle. In this case, the side towards which the arrow on the Y-axis points (+Y side) is the right side of the vehicle, and the opposite side (-Y side) is the left side of the vehicle. Additionally, in this specification, "parallel direction" includes substantially parallel directions, and "orthogonal direction" includes substantially orthogonal directions.

[0057] The central axis J, as illustrated in the diagram, is an imaginary axis extending in a direction intersecting the vertical direction. More specifically, the central axis J extends along the Y-axis direction, which is orthogonal to the vertical direction, i.e., 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 "axial," the radial direction centered on the central axis J is simply referred to as "radial," and the circumferential direction centered on the central axis J, i.e., the direction around the central axis J, is simply referred to as "circumferential." In the following embodiments, the right side (-Y side) is referred to as "axial side," and the left side (+Y side) is referred to as "axial side."

[0058] <First Implementation>

[0059] Figure 1 The drive unit 100 shown in this embodiment is installed in a vehicle and is a drive unit that rotates the axle 64. Vehicles equipped with the drive unit 100 are hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHVs), electric vehicles (EVs), and other vehicles that use an electric motor as a power source. Figure 1As shown, the drive unit 100 includes a rotary motor 10 and a transmission device 60. The transmission device 60 is connected to the rotary motor 10 and transmits the rotation of the rotary motor 10, i.e., the rotation of the rotor 30 described later, to the axle 64 of the vehicle. The transmission device 60 in this embodiment includes: a gear housing 61; a reduction gear 62 connected to the rotary motor 10; and a differential device 63 connected to the reduction gear 62.

[0060] The gear housing 61 internally houses the reduction gear 62, the differential gear 63, and oil O. Oil O is stored in the lower region of the gear housing 61. Oil O circulates within the refrigerant flow path 90, described later. Oil O is used as a refrigerant to cool the rotary motor 10. Additionally, oil O is used as lubricating oil for the reduction gear 62 and the differential gear 63. As for oil O, for example, to perform the functions of both refrigerant and lubricating oil, it is preferable to use an oil with a low viscosity, similar to automatic transmission fluid (ATF).

[0061] The differential 63 has a gear ring 63a. The torque output from the rotary motor 10 is transmitted to the gear ring 63a via the reduction gear 62. The lower end of the gear ring 63a is immersed in oil O stored in the gear housing 61. As the gear ring 63a rotates, the oil O is lifted up. The lifted oil O is supplied to the reduction gear 62 and the differential 63, for example, as lubricating oil.

[0062] The rotary motor 10 is part of the drive unit 100. The rotary motor 10 is located, for example, on the axial side (-Y side) of the transmission device 60. In this embodiment, the rotary motor 10 is a motor. The rotary motor 10 includes: a motor housing 20; a rotor 30 having a shaft 31; bearings 34 and 35 supporting the rotor 30 for rotation; a stator 40; a separator 50; a nozzle assembly 70; and an electrostatic removal device 80. The bearings 34 and 35 are, for example, ball bearings.

[0063] The motor housing 20 is a housing that internally houses the rotor 30 and the stator 40. The motor housing 20 is connected to the gear housing 61 on one axial side (-Y side). The motor housing 20 has a main body 21, a partition wall 22, and a cover 23. The main body 21 and the partition wall 22 are, for example, part of the same single component. The cover 23 is, for example, separate from the main body 21 and the partition wall 22.

[0064] The main body 21 is cylindrical, surrounding the central axis J and open on one axial side (-Y side). A partition wall 22 is connected to the 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 and the interior of the gear housing 61. A bearing 34 is held at the partition wall 22. A cover 23 is fixed to the end of the main body 21 on one axial side. The cover 23 blocks the opening on one axial side of the main body 21. A bearing 35 is held at the cover 23.

[0065] like Figure 2 As shown, the cover portion 23 has an opening portion 23f recessed from the axial side (+Y side) of the cover portion 23 towards the axial side (-Y side). The opening portion 23f is an opening with a bottom on one axial side and an opening on the other axial side. In this embodiment, the opening portion 23f is a circular opening centered on the central axis J. By providing the opening portion 23f, a bottom wall portion 23a and a peripheral wall portion 23b are provided at the cover portion 23. That is, the motor housing 20 has a bottom wall portion 23a and a peripheral wall portion 23b.

[0066] The bottom wall portion 23a is the bottom of the orifice portion 23f. The bottom wall portion 23a is located on one axial side (-Y side) of the opening end 31d of the shaft 31. The peripheral wall portion 23b protrudes from the radial outer periphery of the bottom wall portion 23a to the other axial side (+Y side). The peripheral wall portion 23b surrounds the opening end 31d of the shaft 31. The inner circumferential surface of the peripheral wall portion 23b is the inner circumferential surface of the orifice portion 23f. In this embodiment, the inner circumferential surface of the peripheral wall portion 23b is cylindrical about the central axis J.

[0067] 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 connected to the radially outer peripheral edge 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 radially inside the third wall portion 23e. The outer ring of the bearing 35 is fitted into the radially inside the third wall portion 23e.

[0068] In this embodiment, the inner circumferential 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 between the inner circumferential surface of the first wall portion 23c and the inner circumferential surface of the second wall portion 23d along the axial direction. The first step portion 24a has a first step surface 24c facing the other side (+Y side) along the axial direction. The first step surface 24c is annular about the central axis J. The first step surface 24c is a flat surface orthogonal to the axial direction. The second step portion 24b is a step provided between the inner circumferential surface of the second wall portion 23d and the inner circumferential surface of the third wall portion 23e along the axial direction. The second step portion 24b has a second step surface 24d facing the other side along the axial direction. The second step surface 24d is annular about the central axis J. The second step surface 24d is a flat surface orthogonal to the axial direction. The bearing 35, held within the third wall portion 23e, contacts the second step surface 24d. Therefore, the bearing 35 can be properly positioned axially relative to the motor housing 20. More specifically, the outer ring of bearing 35 contacts the second stepped surface 24d from the other side of the axial direction.

[0069] A resolver holding portion 25 is provided on the surface of the cover portion 23 on the other axial side (+Y side). In this embodiment, the resolver holding portion 25 is composed of a plurality of protruding wall portions 25a protruding to the other axial side. The plurality of protruding wall portions 25a are provided on the periphery of the orifice portion 23f in the surface of the cover portion 23 on the other axial side. The plurality of protruding wall portions 25a are arranged to surround the shaft 31.

[0070] like Figure 1 As shown, rotor 30 has a shaft 31 and a rotor body 32. Although not shown in the figure, rotor body 32 has a rotor core and rotor magnets fixed to the rotor core. The torque of rotor 30 is transmitted to transmission device 60.

[0071] Shaft 31 is rotatable about its central axis J. Shaft 31 is supported by bearings 34 and 35 to enable rotation. Shaft 31 is hollow. Shaft 31 is cylindrical, extending axially about its central axis J. Shaft 31 has a bore 33 connecting its interior and exterior. Shaft 31 is positioned to span the interior of motor housing 20 and gear housing 61. The axial end of shaft 31 on the other side (+Y side) protrudes into the interior of gear housing 61. A speed reduction device 62 is connected to the axial end of shaft 31.

[0072] Shaft 31 has openings on both axial sides. For example... Figure 2As shown, shaft 31 has an open end 31d that opens on one axial side (-Y side). 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 of the third shaft portion 31c on one axial side is the end of the shaft 31 on one axial side, which is the open end 31d.

[0073] The inner diameters of the first shaft portion 31a, the second shaft portion 31b, and the third shaft portion 31c are identical. A stepped portion is provided between the outer peripheral surface of the first shaft portion 31a and the outer peripheral surface of the second shaft portion 31b, and this stepped portion has a stepped surface facing one axial direction (-Y side). A stepped portion is also provided between the outer peripheral surface of the second shaft portion 31b and the outer peripheral surface of the third shaft portion 31c, and this stepped portion has a stepped surface facing one axial direction.

[0074] The portion of the second shaft portion 31b on one axial side (-Y side) and the third shaft portion 31c are located radially inside the peripheral wall portion 23b. More specifically, the portion of the second shaft portion 31b on 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 portion 31d is located radially inside the first wall portion 23c. The outer peripheral surfaces of the second shaft portion 31b and the third shaft portion 31c are configured to move radially inside from the inner peripheral surface of the peripheral wall portion 23b. The opening end portion 31d is configured to move axially from the bottom wall portion 23a to the other side (+Y side).

[0075] like Figure 1 As shown, the stator 40 is radially opposed to the rotor 30 with a gap. 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.

[0076] The stator core 41 is annular, surrounding the central axis J of the rotary electric machine 10. The stator core 41 is located radially outward of the rotor 30. The stator core 41 surrounds the rotor 30. The stator core 41 is constructed, for example, by stacking multiple plate components such as electromagnetic steel plates axially. Although not shown in the figures, the stator core 41 has: a cylindrical core back extending axially; and multiple pole teeth extending radially inward from the core back.

[0077] The coil assembly 42 has a plurality of coils 42c mounted circumferentially on the stator core 41. The plurality of coils 42c are respectively mounted on each pole tooth of the stator core 41 via an insulator (not shown). The coil assembly 42 has coil end ends 42a, 42b protruding axially from the stator core 41.

[0078] The resolver 50 is capable of detecting the rotation of the rotor 30. The resolver 50 is housed 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, surrounding the shaft 31. In this embodiment, the resolver rotor 51 is annular, centered on the central axis J. Figure 2 As shown, 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 its plate surface facing axially. The surface of the resolver rotor 51 on the other axial side contacts the step surface of the step portion provided between the first shaft portion 31a and the second shaft portion 31b on the axial side. The resolver rotor 51 protrudes radially outward from the outer peripheral surface of the first shaft portion 31a. The resolver rotor 51 is spaced apart on the other axial side of the bearing 35.

[0079] The resolver stator 52 is located radially outside the resolver rotor 51. The resolver stator 52 is annular, surrounding the resolver rotor 51. The resolver stator 52 is held by the resolver holding part 25. Although not shown in the figure, the resolver stator 52 has coils. By rotating the resolver rotor 51 together with the shaft 31, an induced voltage corresponding to the circumferential position of the resolver rotor 51 is generated in the coils of the resolver stator 52. The resolver 50 can detect the rotation of the resolver rotor 51 and the shaft 31 based on the change in the induced voltage generated in the coils of the resolver stator 52. Thus, the resolver 50 can detect the rotation of the rotor 30.

[0080] The current-eliminating device 80 is located radially inside the peripheral wall portion 23b. The current-eliminating device 80 is annular, surrounding the shaft 31. In this embodiment, the current-eliminating device 80 is annular with the central axis J as its center. The current-eliminating device 80 surrounds the third shaft portion 31c. In this embodiment, the current-eliminating device 80 is fitted radially inside the second wall portion 23d. The current-eliminating device 80 is located on the axially opposite side (+Y side) of the opening end portion 31d. That is, the opening end portion 31d is located on the axially opposite side (-Y side) of the current-eliminating device 80.

[0081] The electrostatic removal device 80 is located on one axial side (-Y side) of the bearing 35. Therefore, the bearing 35 is positioned axially between the resolver rotor 51 and the electrostatic removal device 80. In this embodiment, the electrostatic removal device 80 is positioned opposite the bearing 35 with a clearance. The axial distance between the electrostatic removal device 80 and the bearing 35 is less than the axial distance between the bearing 35 and the resolver rotor 51. Figure 3 As shown, the de-energizing device 80 has: an annular base 81 centered on the central axis J; and a brush portion 82 provided throughout the entire circumference of the radial inner edge of the base 81.

[0082] like Figure 2 As shown, the base 81 is fitted into the radially inner side of the second wall portion 23d. The base 81 is fixed to the second wall portion 23d, for example, by an adhesive. Thus, the current-eliminating device 80 is fixed to the motor housing 20. Furthermore, the method of fixing the current-eliminating device 80 to the motor housing 20 is not particularly limited. The current-eliminating device 80 may also be fixed to the motor housing 20 by pressing, for example.

[0083] The axial side (-Y side) of the radial outer edge of the base 81 contacts the first stepped surface 24c. Thus, the current-eliminating device 80 contacts the first stepped surface 24c. Therefore, the current-eliminating device 80 can be properly positioned axially relative to the motor housing 20. The base 81 is in electrical contact with the peripheral wall portion 23b. Thus, the current-eliminating device 80 is in electrical contact with the motor housing 20. Furthermore, in this specification, the phrase "electrical contact between one object and another object" simply means that current can flow between the object and the other object.

[0084] The brush portion 82 is annular, surrounding the shaft 31. More specifically, the brush portion 82 is annular, centered on the central axis J, and surrounding the third shaft portion 31c. In this embodiment, the brush portion 82 is composed of a plurality of conductive fibers protruding radially inward from the radially inner edge of the base 81. The fibers constituting the brush portion 82 are, for example, microfibers. The brush portion 82 is electrically connected to the base 81. The radially inner edge of the brush portion 82 is in electrical contact with the outer peripheral surface of the third shaft portion 31c. Thus, the current-eliminating device 80 is in electrical contact with the shaft 31. In this embodiment, the shaft 31 rotates while rubbing the outer peripheral surface of the third shaft portion 31c against the radially inner edge of the brush portion 82.

[0085] Thus, the shaft 31 and the motor housing 20 are electrically connected via the current removal device 80. Therefore, the current generated in the shaft 31 can flow sequentially from the peripheral wall portion 23b to the motor housing 20 via the brush portion 82 and the base portion 81. This prevents current from flowing from the shaft 31 to the bearings 34 and 35 that rotatably support the shaft 31. Therefore, electrolytic corrosion in the bearings 34 and 35 can be suppressed.

[0086] In this embodiment, the electrostatic precipitator 80 exhibits excellent oil resistance. That is, changes caused by contact with oil O are not easily observed in the electrostatic precipitator 80. Furthermore, regarding oil resistance, an immersion test in oil O is considered for evaluation. In this case, oil resistance is evaluated by the weight change and strength change after immersion for a specified time. The evaluation of weight change includes considerations such as corrosion and swelling.

[0087] The nozzle component 70 is a component for supplying oil O, which is a fluid, into the interior of the shaft 31. The nozzle component 70 is manufactured, for example, by machining a sheet metal component by stamping. The nozzle component 70 is disposed within the peripheral wall portion 23b. The nozzle component 70 has a supply cylinder portion 71 and a flange portion 72.

[0088] The supply cylinder 71 extends axially. In this embodiment, the supply cylinder 71 is cylindrical about the central axis J. The supply cylinder 71 is open on both axial sides. At least a portion of the supply cylinder 71 is inserted into the interior of the shaft 31 from the open end 31d. In this embodiment, the entire supply cylinder 71, except for the end on the axial side (-Y side), is inserted into the interior of the shaft 31. The end on the axial side of the supply cylinder 71 is located axially closer to the shaft 31. In this embodiment, the outer peripheral surface of the supply cylinder 71 is configured to move radially inward from the inner peripheral surface of the shaft 31. Therefore, friction between the supply cylinder 71 and the shaft 31 can be suppressed. Thus, wear of the supply cylinder 71 can be suppressed. The supply cylinder 71 has a large diameter portion 71a, a small diameter portion 71b, and a connecting portion 71c. Figures 2 to 4 As shown, in this embodiment, the supply cylinder 71 is configured in a funnel shape by a large diameter portion 71a, a small diameter portion 71b, and a connecting portion 71c.

[0089] like Figure 2 As shown, the large-diameter portion 71a is the portion on one axial side (-Y side) of the supply cylinder portion 71. The end of the large-diameter portion 71a on one axial side is the end of the supply cylinder portion 71 on one axial side. The large-diameter portion 71a has: an insertion portion 71d inserted into the shaft 31; and an expanding portion 71e connected to the axial side of the insertion portion 71d. In this embodiment, the insertion portion 71d is located radially inward of the third shaft portion 31c. The outer peripheral surface of the insertion portion 71d is configured to move radially inward from the inner peripheral surface of the third shaft portion 31c. The inner diameter and outer diameter of the insertion portion 71d are the same throughout the axial direction. The inner diameter and outer diameter of the expanding portion 71e increase as it moves away from the insertion portion 71d towards the axial side. Thus, in this embodiment, the inner diameter of the end of the supply cylinder portion 71 on one axial side increases as it moves towards the axial side.

[0090] The inner circumferential surface of the enlarged diameter portion 71e is a conical surface whose inner diameter linearly decreases towards the other axial side (+Y side). The outer circumferential surface of the enlarged diameter portion 71e is a conical surface whose outer diameter linearly decreases towards the other axial side. In this embodiment, the end of the enlarged diameter portion 71e on the axial side (-Y side) is located radially outward from the inner circumferential surface of the opening end 31d, and radially inward from the outer circumferential surface of the opening end 31d. The end of the enlarged diameter portion 71e on the axial side is configured to move away from the opening end 31d towards the axial side. The axial dimension of the enlarged diameter portion 71e is smaller than the axial dimension of the inserted portion 71d.

[0091] The small-diameter portion 71b is the portion on the other axial side (+Y side) of the supply cylinder 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 of the small-diameter portion 71b on the other axial side is the end of the supply cylinder portion 71 on the other axial side. The inner diameter of the small-diameter portion 71b is smaller than the inner diameter of the large-diameter portion 71a. For example, the inner diameter of the small-diameter portion 71b is less than half 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. For example, the outer diameter of the small-diameter portion 71b is less than half 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.

[0092] The entire small-diameter portion 71b is inserted into the interior of 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 configured to move radially inward 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 of the small-diameter portion 71b on the other axial side (+Y side) is located radially inside the resolver rotor 51.

[0093] The connecting portion 71c extends radially, connecting the end of the larger diameter portion 71a on the other axial side (+Y side) to the end of the smaller diameter portion 71b on one axial side (-Y side). In this embodiment, the connecting portion 71c is positioned so that it faces the other axial side as it moves from the radially outer side to the radially inner side. The connecting portion 71c has a connecting surface 71f facing the axial side. The connecting surface 71f is an annular surface centered on the central axis J. The connecting surface 71f connects the inner circumferential surface of the larger diameter portion 71a and the inner circumferential surface of the smaller diameter portion 71b. More specifically, the connecting surface 71f connects the end of the insert portion 71d on the other axial side in the inner circumferential surface to the end of the smaller diameter portion 71b on one axial side in the inner circumferential surface. The connecting surface 71f is a conical surface whose inner diameter linearly decreases towards the other axial side. The slope of the connecting surface 71f relative to the axial direction is greater than the slope of the inner circumferential surface of the enlarged diameter portion 71e relative to the axial direction.

[0094] The flange portion 72 protrudes radially outward from the supply cylinder portion 71. In this embodiment, the flange portion 72 protrudes radially outward from one axial side (-Y side) of the supply cylinder portion 71. The flange portion 72 is annular around the central axis J. In this embodiment, the flange portion 72 is annular with the central axis J as its center.

[0095] The flange portion 72 is located axially between the current-eliminating device 80 and the bottom wall portion 23a. Thus, the current-eliminating device 80 is located axially between the bearing 35 and the flange portion 72. The flange portion 72 is positioned opposite to the other axial side (+Y side) of the bottom wall portion 23a. The flange portion 72 is positioned opposite to one axial side of the current-eliminating device 80. The flange portion 72 has an annular portion 72a and a cylindrical portion 72b.

[0096] The annular portion 72a is the portion that protrudes radially outward from the supply cylinder portion 71. In this embodiment, the annular portion 72a protrudes radially outward from the end of the expanded diameter portion 71e on one axial side (-Y side). The annular portion 72a is circular about the central axis J. The annular portion 72a is plate-shaped with the plate surface facing axially. The annular portion 72a has an inner annular portion 72c and an outer annular portion 72d.

[0097] The inner annular portion 72c is the radially inner portion of the annular portion 72a. The radially inner edge of the inner annular portion 72c is connected to the end of the expanded diameter portion 71e on one axial side (-Y side). The radially outer edge of the inner annular portion 72c is located radially outer than the outer peripheral surface of the second shaft portion 31b. The axially side surface of the inner annular portion 72c is a flat surface 72e, which is part of the axially side surface of the flange portion 72. The flat surface 72e is orthogonal to the axial direction. Figure 3 As shown, the flat surface 72e is in the shape of a ring centered on the central axis J.

[0098] The outer annular portion 72d is the radially outer portion of the annular portion 72a. The outer annular portion 72d is connected to the radially outer portion of the inner annular portion 72c. The outer annular portion 72d is positioned such that it faces the other side (+Y side) axially as it moves radially outward from the radially outer edge of the inner annular portion 72c. The surface of the outer annular portion 72d on the axial side (-Y side) is an inclined surface 72f that forms part of the surface of the flange portion 72 on the axial side. That is, the surface of the flange portion 72 on the axial side has an inclined surface 72f. In this embodiment, the surface of the flange portion 72 on the axial side is composed of a flat surface 72e and an inclined surface 72f. The inclined surface 72f is positioned such that it faces the other side axially as it moves radially outward. The inclined surface 72f is annular about the central axis J. The inclined surface 72f is a conical surface whose outer diameter linearly decreases towards the axial side.

[0099] like Figure 2As shown, the cylindrical portion 72b protrudes axially from the radially outer edge of the annular portion 72a to the other side (+Y side). The cylindrical portion 72b is cylindrical with the central axis J as its center. The cylindrical portion 72b is fitted into the radially inner side of the first wall portion 23c. Thus, in this embodiment, the flange portion 72 is fitted inside the peripheral wall portion 23b. Therefore, the nozzle component 70 can be radially positioned relative to the motor housing 20. In this embodiment, since the cylindrical portion 72b protrudes axially from the radially outer edge of the annular portion 72a is provided, by fitting the cylindrical portion 72b inside the peripheral wall portion 23b, the nozzle component 70 can be more appropriately positioned radially relative to the motor housing 20.

[0100] The axial end of the cylindrical portion 72b is located on the opposite side of the opening end 31d. The 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 and the electrostatic removal device 80 are axially opposed to each other. Figure 2 In the example, the end of the cylindrical portion 72b on the other side of the axial direction is in contact with the surface of the base portion 81 on one side of the axial direction (-Y side).

[0101] The axial dimension L1 of the flange portion 72 is smaller than the axial distance L2 between the bottom wall portion 23a and the current-eliminating device 80. Therefore, the flange portion 72 is configured to be axially separated from at least one of the bottom wall portion 23a and the current-eliminating device 80. Figure 2 In this example, the flange portion 72 is positioned away from the bottom wall portion 23a and moves axially to the other side (+Y side) to contact the electrostatic removal device 80. In this embodiment, the nozzle component 70 is axially movable within a range that the flange portion 72 can move between the bottom wall portion 23a and the electrostatic removal device 80. The axial dimension L1 of the flange portion 72 is the axial distance between the flat surface 72e and the end of the cylindrical portion 72b on the other side of the axial direction. The axial distance L2 between the bottom wall portion 23a and the electrostatic removal device 80 is the axial distance between the surface of the bottom wall portion 23a on the other side of the axial direction and the surface of the base portion 81 on one side of the axial direction (-Y side). In this embodiment, the axial distance L2 between the bottom wall portion 23a and the electrostatic removal device 80 is the same as the axial dimension of the first wall portion 23c.

[0102] 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 on the other side (+Y side) of the bottom wall portion 23a in the axial direction; and a gap G2 between the inclined surface 72f and the surface on the other side of the bottom wall portion 23a in the axial direction. Gap G2 is larger than gap G1. Additionally, when the nozzle component 70... Figure 2When the position shown is moved to one axial side (-Y side) and the flat surface 72e contacts the surface on the other axial side of the bottom wall portion 23a, only a 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 is in contact with the bottom wall portion 23a, a gap G2 can be provided between the flange portion 72 and the bottom wall portion 23a in the axial direction.

[0103] In this embodiment, the flange portion 72 has at least one supply hole 73 for supplying oil O, a fluid, to the bearing 35. Therefore, oil O, as a lubricant, can be supplied to the bearing 35 via the supply hole 73. In this embodiment, the supply hole 73 is a hole that extends axially through the flange portion 72. In this embodiment, the supply hole 73 is provided in the outer annular portion 72d. The supply hole 73 opens on the inclined surface 72f. The supply hole 73 opens in the gap G between the flange portion 72 and the bottom wall portion 23a. More specifically, the supply hole 73 opens in the gap G2 between the inclined surface 72f and the surface on the other axial side (+Y side) of the bottom wall portion 23a. The supply hole 73 opens between the electrostatic removal device 80 and the flange portion 72. Figure 3 and Figure 4 As shown, in this embodiment, the supply hole 73 is a circular hole. Multiple supply holes 73 are provided at intervals in the circumferential direction. The multiple supply holes 73 are arranged at equal intervals around the circumference. For example, four supply holes 73 are provided.

[0104] like Figure 1 As shown, in this embodiment, a refrigerant flow path 90 for circulating oil O, which is a refrigerant, is provided in the drive device 100. The refrigerant flow path 90 is configured to span the interior of the motor housing 20 and the interior of the gear housing 61. The refrigerant flow path 90 is the path through which oil O stored in the gear housing 61 is supplied to the rotary motor 10 and then returns to the gear housing 61. A pump 96, a cooler 97, and a refrigerant supply unit 95 are provided in the refrigerant flow path 90. In the following description, the upstream side in the flow direction of oil O in the refrigerant flow path 90 will be referred to as the "upstream side", and the downstream side in the flow direction of oil O in the refrigerant flow path 90 will be referred to as the "downstream side". The refrigerant flow path 90 has a gear-side flow path 91, a connecting flow path 92, and a rotary motor-side flow path 93.

[0105] The gear-side flow path 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 the wall of the gear housing 61. The first portion 91a connects the portion of the gear housing 61 containing oil O to the pump 96. The second portion 91b connects the pump 96 to the cooler 97.

[0106] The connecting flow path 92 is configured to span the wall of the gear housing 61 and the wall of the motor housing 20. The connecting flow path 92 connects the gear-side flow path 91 and the rotary motor-side flow path 93. More specifically, the connecting flow path 92 connects the cooler 97 and the third flow path 93c, which will be described later.

[0107] A rotary motor-side flow path 93 is provided on the rotary motor 10. The rotary motor-side flow path 93 has a first flow path 93a, a second flow path 93b, and a third flow path 93c. That is, the rotary motor 10 includes a first flow path 93a, a second flow path 93b, and a third flow path 93c. The first flow path 93a and the third flow path 93c are provided on the wall of the motor housing 20. The second flow path 93b has a housing flow path 93d and a refrigerant supply section 95 provided on the wall of the motor housing 20. In this embodiment, the first flow path 93a, the third flow path 93c, and the housing flow path 93d are provided on the cover 23. The first flow path 93a and the second flow path 93b are connected to the third flow path 93c. In this embodiment, the first flow path 93a and the second flow path 93b branch off from the third flow path 93c.

[0108] The first flow path 93a is a flow path that supplies oil O as a fluid to the interior of the peripheral wall 23b. The upstream end of the first flow path 93a is connected to the downstream end of the third flow path 93c. The downstream end of the first flow path 93a opens inside the peripheral wall 23b. Although not shown in the figure, the downstream end of the first flow path 93a opens, for example, at the end on the axial side (-Y side) of the inner circumferential surface of the peripheral wall 23b.

[0109] The second flow path 93b is a flow path that supplies oil O as a fluid to the stator 40. The upstream end of the housing flow path 93d in the second flow path 93b is connected to the downstream end of the third flow path 93c. The downstream end of the housing flow path 93d is connected to the upstream end of the refrigerant supply section 95.

[0110] In this embodiment, the refrigerant supply section 95 is a tubular shape extending axially. In other words, in this embodiment, the refrigerant supply section 95 is a tubular shape extending axially. Both axial ends of the refrigerant supply section 95 are supported by the motor housing 20. The end of the refrigerant supply section 95 on the other axial side (+Y side) is supported, for example, by the partition wall portion 22. The end of the refrigerant supply section 95 on one axial side (-Y side) is supported, for example, by the cover portion 23.

[0111] The refrigerant supply section 95 is located radially outside the stator 40. In this embodiment, the refrigerant supply section 95 is located above the stator 40. In this embodiment, the flow direction of the oil O within the refrigerant supply section 95 is from one axial side to the other axial side. That is, in the flow direction of the oil O within the refrigerant supply section 95, the axial side is the upstream side, and the other axial side is the downstream side. The refrigerant supply section 95 has a supply port 95a for supplying oil O as refrigerant to the stator 40. In this embodiment, the supply port 95a is a spray port that sprays a portion of the oil O flowing into the refrigerant supply section 95 to the outside of the refrigerant supply section 95. Multiple supply ports 95a are provided.

[0112] When the pump 96 is driven, the oil O stored in the gear housing 61 is drawn up through the first part 91a and flows into the cooler 97 through the second part 91b. After being cooled in the cooler 97, the oil O flows through the connecting flow path 92 and from the third flow path 93c into the rotary motor side flow path 93. The oil O flowing into the third flow path 93c branches into the first flow path 93a and the second flow path 93b. The oil O flowing into the first flow path 93a flows into the interior of the peripheral wall 23b. In this embodiment, the oil O from the first flow path 93a flows into the axial gap G between the flange 72 and the bottom wall 23a. More specifically, the oil O from the first flow path 93a flows into the axial gap G2 between the inclined surface 72f and the bottom wall 23a.

[0113] like Figure 2 As shown, a portion of the oil O flowing into the interior of the peripheral wall portion 23b passes through the supply cylinder portion 71 of the nozzle component 70 and flows into the interior of the shaft 31. Thus, in this embodiment, by providing the first flow path portion 93a, oil O can be supplied from inside the peripheral wall portion 23b into the shaft 31. In this embodiment, oil O flowing into the gap G2 passes through the gap G1 and flows into the supply cylinder portion 71 from the end on the axial side (-Y side). 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 electrostatic eliminator 80, the gap G1 can be appropriately generated. Therefore, as in this embodiment, even when oil O is supplied from the first flow path portion 93a to the gap G2, oil O can be easily supplied into the supply cylinder portion 71 via the gap G1. Furthermore, in this embodiment, the inner diameter of the end on the axial side of the supply cylinder portion 71 increases towards the axial side. Therefore, oil O can be easily flowed into the supply cylinder 71 from the end on the axial side of the supply cylinder 71. As a result, oil O can be supplied into the supply cylinder 71 more easily.

[0114] like Figure 1 As shown, the oil O flowing from the nozzle component 70 into the shaft 31 passes through the orifice 33 into the interior of the rotor body 32 and disperses towards the stator 40. For example... Figure 2 As shown, another portion of the oil O flowing into the interior of the peripheral wall 23b is supplied to the bearing 35 from one axial side (-Y side) through the supply hole 73 to the other axial side (+Y side).

[0115] In this embodiment, the supply hole 73 opens at the gap G between the flange portion 72 and the bottom wall portion 23a. Therefore, oil O flowing into the gap G easily passes through the supply hole 73. This allows oil O to be easily supplied to the bearing 35 via the supply hole 73. Furthermore, in this embodiment, the supply hole 73 opens on the inclined surface 72f. Therefore, even when the flange portion 72 is in contact with the bottom wall portion 23a, 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. Therefore, it is even easier to supply oil O to the bearing 35 via the supply hole 73.

[0116] Oil O supplied to bearing 35, for example, passes through the supply hole 73 and then through the radial gap between the electrostatic eliminator 80 and shaft 31 to reach bearing 35. Alternatively, a portion of the oil O flowing into the peripheral wall portion 23b may also flow into shaft 31 through the radial gap between shaft 31 and supply cylinder portion 71 after passing through the supply hole 73 from one axial side to the other axial side.

[0117] like Figure 1 As shown, the oil O flowing into the second flow path 93b flows through the housing flow path 93d to the interior of the refrigerant supply section 95. The oil O flowing into the refrigerant supply section 95 is sprayed from the supply port 95a and supplied to the stator 40. In this way, by providing the first flow path 93a and the second flow path 93b branching from the third flow path 93c, the oil O delivered from the gear housing 61 can be supplied appropriately and easily to the shaft 31 via the peripheral wall 23b, and can be supplied to the stator 40 from the refrigerant supply section 95.

[0118] In this embodiment, a portion of the oil O stirred up by the gear ring 63a enters the storage section 98 provided within the gear housing 61. The oil O entering the storage section 98 flows into the shaft 31 from the end on the other axial side (+Y side). The oil O flowing into the shaft 31 from the storage section 98 passes through the bore 33 through the interior of the rotor body 32 and disperses towards the stator 40.

[0119] Oil O supplied to the stator 40 from the supply port 95a and oil O supplied to the stator 40 from inside the shaft 31 carry away heat from the stator 40. The oil O that has cooled the stator 40 falls downward and accumulates in the lower region inside the motor housing 20. The oil O accumulated in the lower region inside the motor housing 20 returns to the gear housing 61 through the partition wall opening 22a provided in the partition wall portion 22. As described above, the refrigerant flow path 90 supplies the oil O stored in the gear housing 61 to the rotor 30 and the stator 40.

[0120] According to this embodiment, the flange portion 72 is located axially between the current-eliminating device 80 fixed to the motor housing 20 and the bottom wall portion 23a. Therefore, the flange portion 72 can be pressed from one axial side using the bottom wall portion 23a, and the flange portion 72 can be pressed from the other axial side using the current-eliminating device 80. That is, the nozzle component 70 can be suppressed from axial movement relative to the motor housing 20 by the current-eliminating device 80. Therefore, by fixing the current-eliminating device 80 to the motor housing 20, the nozzle component 70 can be mounted on the motor housing 20. Therefore, apart from the current-eliminating device 80, there is no need to provide a fixing component for fixing the nozzle component 70 to the motor housing 20, and the number of parts in the rotary motor 10 can be reduced. As a result, the number of parts in the drive device 100 can also be reduced. By reducing the number of parts in the rotary motor 10 and the drive device 100, the labor time and time required for assembling the rotary motor 10 and the drive device 100 can be reduced.

[0121] Furthermore, according to this embodiment, the current-eliminating device 80 is located axially between the bearing 35 and the flange 72. Therefore, even if the current-eliminating device 80 detaches from the motor housing 20, the bearing 35 can suppress the current-eliminating device 80 from moving to the other side axially. Thus, even if the current-eliminating device 80 detaches from the motor housing 20, the current-eliminating device 80 can suppress the flange 72 from moving to the other side axially.

[0122] Furthermore, according to this embodiment, the bearing 35 is located axially between the decomposer rotor 51 and the electrostatic precipitator 80. Therefore, compared to the case where the decomposer rotor 51 is positioned axially between the bearing 35 and the electrostatic precipitator 80, the bearing 35 can be positioned closer to the electrostatic precipitator 80. Consequently, in the case where oil O is supplied to the bearing 35 from the supply hole 73 of the nozzle component 70 as in this embodiment, it is easier for oil O to reach the bearing 35 from the supply hole 73.

[0123] Furthermore, according to this embodiment, the opening end 31d is located radially inside the cylindrical portion 72b on the axial side (-Y side) of the electrostatic remover 80. Therefore, by extending the shaft 31 towards the axial side of the electrostatic remover 80, it is easy for the electrostatic remover 80 to contact the shaft 31. Moreover, by arranging the portion of the shaft 31 extending towards the axial side of the electrostatic remover 80 within the cylindrical portion 72b, it is possible to suppress the overall axial enlargement of the rotary motor 10.

[0124] Furthermore, according to this embodiment, the supply cylinder 71 has a large-diameter portion 71a and a small-diameter portion 71b connected to the other axial side (+Y side) of the large-diameter portion 71a, with an inner diameter smaller than that of the large-diameter portion 71a. Thus, by providing the small-diameter portion 71b on the supply cylinder 71, a portion of the supply cylinder 71 is made thinner, which can suppress excessive flow of oil O from the supply cylinder 71 into the shaft 31. Therefore, a portion of the oil O flowing into the peripheral wall portion 23b can be easily supplied to the bearing 35 through the supply hole 73. In addition, excessive amounts of oil O flowing into the peripheral wall portion 23b from the first flow path portion 93a can be suppressed. Therefore, excessive oil O branching from the third flow path portion 93c to the first flow path portion 93a can be suppressed, and insufficient oil O branching from the third flow path portion 93c to the second flow path portion 93b can be suppressed. Therefore, oil O can be appropriately supplied to the stator 40 from the second flow path portion 93b. In addition, oil O can be accumulated in the large diameter portion 71a, and the oil O accumulated in the large diameter portion 71a can be stably supplied to the shaft 31 sequentially from the small diameter portion 71b.

[0125] Furthermore, according to this embodiment, the connecting portion 71c, which connects the end of the large-diameter portion 71a on the other axial side (+Y side) to the end of the small-diameter portion 71b on one axial side (-Y side), has a connecting surface 71f positioned such that it faces the other axial side as it moves from the inner circumferential surface of the large-diameter portion 71a toward the inner circumferential surface of the small-diameter portion 71b. Therefore, oil O flowing into the large-diameter portion 71a can easily flow into the small-diameter portion 71b along the connecting surface 71f. Consequently, oil O can be easily supplied from the small-diameter portion 71b into the shaft 31.

[0126] <Second Implementation>

[0127] like Figure 5 As shown, in the rotary motor 210 of the drive device 200 of this embodiment, a first flow path 293a is provided in the radial center of the bottom wall portion 223a. Unlike the first embodiment, the first wall portion 23c is not provided on the peripheral wall portion 223b. In this embodiment, the second wall portion 23d is connected to the bottom wall portion 223a.

[0128] In the supply cylinder portion 271 of the nozzle component 270, the inner and outer diameters of the large-diameter portion 271a are the same throughout the axial direction. The flange portion 272 protrudes radially outward from the end of the large-diameter portion 271a on one axial side (-Y side). In this embodiment, the flange portion 272 is plate-shaped with a flat, plate-like surface orthogonal to the axial direction. Unlike the flange portion 72 of the first embodiment, the flange portion 272 does not have a cylindrical portion 72b. The axial side surface of the flange portion 272 contacts the axial side surface of the bottom wall portion 223a on the other axial side (+Y side).

[0129] The axial side (-Y side) of the base 281 of the electrostatic eliminator 280 contacts the axial side (+Y side) of the flange 272. Thus, the flange 272 contacts both the bottom wall 223a and the electrostatic eliminator 280 in the axial direction. Therefore, the electrostatic eliminator 280 can more appropriately suppress the nozzle component 270 from moving to the other axial side. In this embodiment, the electrostatic eliminator 280 allows for a more stable mounting of the nozzle component 270 to the motor housing 220. Furthermore, axial wobbling of the nozzle component 270 can be suppressed. Therefore, noise generated from the rotary motor 210 can be suppressed.

[0130] In this embodiment, the electrostatic discharge device 280 is axially positioned relative to the motor housing 220 by contacting the surface of the flange portion 272 on the other side of the axial direction. Unlike the first embodiment, there is no gap between the flange portion 272 and the bottom wall portion 223a in the axial direction. Unlike the flange portion 72 in the first embodiment, the flange portion 272 does not have a supply hole 73. The radially outer edge of the flange portion 272 moves radially inward from the inner circumferential surface of the peripheral wall portion 223b.

[0131] In this embodiment, the opening end 231d of the third shaft portion 231c of shaft 231 is located on the opposite axial side (+Y side) of the end of the electric stripper 280, relative to one axial side (-Y side). The opening end 231d is disposed opposite to the opposite axial side of the flange portion 272 with a gap between them. Other structures of the rotary motor 210 may be the same as those of the rotary motor 10 of the first embodiment. Other structures of the drive device 200 may be the same as those of the drive device 100 of the first embodiment.

[0132] This invention is not limited to the embodiments described above. Within the scope of the technical concept of this invention, other structures and methods can also be employed. The current removal device can be of any type, as long as it makes electrical contact with the shaft and the housing of the rotating motor to allow the current flowing through the shaft to escape into the housing.

[0133] The nozzle assembly can be of any shape as long as it has a supply cylinder and a flange. The cylindrical portion of the nozzle assembly can also protrude axially from the radial outer edge of the annular portion. The inner diameter of the supply cylinder can be the same throughout the axial direction. The outer circumferential surface of the supply cylinder can also contact the inner circumferential surface of the shaft. The fluid supplied from the nozzle assembly to the inside of the shaft can be any kind of fluid. This fluid can be an insulating liquid or water. If the fluid is water, the surface of the stator can also be insulated. There are no particular limitations on the construction and method of supplying fluid into the peripheral wall portion. There are no particular limitations on the configuration of the decomposer and the bearings.

[0134] The rotary motor using this invention is not limited to a motor, but can also be a generator. The application of the rotary motor is not particularly limited. For example, the rotary motor can be installed in a vehicle for purposes other than rotating an axle, or in equipment other than a vehicle. The posture when using the rotary motor is not particularly limited. The central axis of the rotary motor can also extend in a vertical direction. The structures and methods described above in this specification can be appropriately combined without contradiction.

Claims

1. A rotary electric motor, wherein, The rotary motor includes: A rotor having a hollow shaft capable of rotating about a central axis; The stator is opposite the rotor with a gap between them; A housing that internally houses the rotor and the stator; The bearing supports the rotor so that it can rotate; An electric shock eliminator, fixed to the housing, and in electrical contact with the shaft and the housing; and Nozzle assembly that supplies fluid to the interior of the shaft. The shaft has an open end that opens on one side in the axial direction. The housing has: The bottom wall portion, located on one axial side of the opening end; and A peripheral wall portion, which protrudes axially from the bottom wall portion to the other side and surrounds the opening end. The nozzle component has: A supply cylinder, at least a portion of which is inserted into the interior of the shaft from the open end; and A flange portion that protrudes radially outward from the supply cylinder portion. The electrostatic removal device is located radially inside the peripheral wall portion. The flange portion is located axially between the electrostatic removal device and the bottom wall portion.

2. The rotary motor as claimed in claim 1, wherein, The inner circumferential surface of the peripheral wall portion has a first stepped portion, and the first stepped portion has a first stepped surface facing the other side of the axial direction. The current removal device is in contact with the first stepped surface.

3. The rotary motor as described in claim 1, wherein, The current removal device is located axially between the bearing and the flange.

4. The rotary motor as described in claim 2, wherein, The current removal device is located axially between the bearing and the flange.

5. The rotary motor as described in claim 3, wherein, The rotary motor also includes a decomposer capable of detecting the rotation of the rotor. The decomposer includes: The resolver rotor fixed to the shaft; and The resolver stator is located radially outside the resolver rotor. The bearing is located axially between the decomposer rotor and the electrostatic removal device.

6. The rotary electric motor as claimed in claim 4, wherein, The rotary motor also includes a decomposer capable of detecting the rotation of the rotor. The decomposer includes: The resolver rotor fixed to the shaft; and The resolver stator is located radially outside the resolver rotor. The bearing is located axially between the decomposer rotor and the electrostatic removal device.

7. The rotary motor as claimed in claim 3, wherein, The inner circumferential surface of the peripheral wall portion has a second stepped portion, and the second stepped portion has a second stepped surface facing the other side of the axial direction. The bearing is in contact with the second stepped surface.

8. The rotary electric motor as claimed in claim 4, wherein, The inner circumferential surface of the peripheral wall portion has a second stepped portion, and the second stepped portion has a second stepped surface facing the other side of the axial direction. The bearing is in contact with the second stepped surface.

9. The rotary electric motor as claimed in claim 5, wherein, The inner circumferential surface of the peripheral wall portion has a second stepped portion, and the second stepped portion has a second stepped surface facing the other side of the axial direction. The bearing is in contact with the second stepped surface.

10. The rotary electric motor as claimed in claim 6, wherein, The inner circumferential surface of the peripheral wall portion has a second stepped portion, and the second stepped portion has a second stepped surface facing the other side of the axial direction. The bearing is in contact with the second stepped surface.

11. The rotary electric motor as claimed in any one of claims 1 to 10, wherein, The flange portion has at least one supply hole for supplying the fluid to the bearing.

12. The rotary electric motor as claimed in claim 11, wherein, A gap is provided between the flange portion and the bottom wall portion in the axial direction. The supply hole opens at the gap.

13. The rotary electric motor as claimed in claim 11, wherein, The axial side of the flange has an inclined surface positioned so that it faces the other axial side as it moves radially outward. The supply hole opens on the inclined surface.

14. The rotary electric motor as claimed in claim 12, wherein, The axial side of the flange has an inclined surface positioned so that it faces the other axial side as it moves radially outward. The supply hole opens on the inclined surface.

15. The rotary electric motor as claimed in any one of claims 1 to 10, wherein, The flange portion is fitted inside the peripheral wall portion.

16. The rotary electric motor as claimed in any one of claims 1 to 10, wherein, The flange portion has: An annular portion protruding radially outward from the supply cylinder portion; and A cylindrical portion that protrudes axially from the radial outer edge of the annular portion.

17. The rotary electric motor as claimed in claim 16, wherein, The cylindrical portion protrudes from the radial outer edge of the annular portion to the other side in the axial direction, and is axially opposite to the electrostatic removal device. The opening end is located on the axial side of the power removal device and on the radially inner side of the cylindrical portion.

18. The rotary electric motor as claimed in any one of claims 1 to 10, wherein, The supply cylinder has: Large diameter part; The small diameter portion is connected to the other side of the large diameter portion along its axial direction, and the inner diameter of the small diameter portion is smaller than the inner diameter of the large diameter portion.

19. The rotary electric motor as claimed in claim 18, wherein, The supply cylinder has a connecting portion that extends radially and connects the end of the large-diameter portion on one axial side to the end of the small-diameter portion on one axial side. The connecting portion has a connecting surface facing one axial direction, and connects the inner circumferential surface of the large-diameter portion to the inner circumferential surface of the small-diameter portion. The connecting surface is positioned such that it faces the opposite side of the axial direction as it moves from the inner circumferential surface of the larger diameter portion toward the inner circumferential surface of the smaller diameter portion.

20. The rotary electric motor as claimed in any one of claims 1 to 10, wherein, The outer peripheral surface of the supply cylinder is configured to move radially inward from the inner peripheral surface of the shaft.

21. The rotary electric motor as claimed in any one of claims 1 to 10, wherein, The inner diameter at the end of the supply cylinder on the axial side increases as it moves toward the axial side.

22. The rotary electric motor as claimed in any one of claims 1 to 10, wherein, The axial dimension of the flange portion is smaller than the axial distance between the bottom wall portion and the electrostatic removal device.

23. The rotary electric motor as claimed in any one of claims 1 to 10, wherein, The flange portion is in axial contact with both the bottom wall portion and the electrostatic removal device.

24. The rotary electric motor as claimed in any one of claims 1 to 10, wherein, The rotary motor also includes a first flow path that supplies the fluid to the interior of the peripheral wall portion.

25. The rotary electric motor as claimed in claim 24, wherein, The rotary motor also includes: A second flow path section that supplies the fluid to the stator; and The third flow path section is located in the peripheral wall portion and is connected to the upstream of the first flow path section and the upstream of the second flow path section. The first flow path and the second flow path branch off from the third flow path.

26. A drive unit installed in a vehicle, wherein, The driving device includes: The rotary electric motor according to any one of claims 1 to 25; and A transmission device that is connected to the rotary motor and transmits the rotation of the rotary motor to the axle of the vehicle.

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