motor

Abstract

A de-electrization device electrically connects a shaft of a motor to a housing. A plate body portion of the housing has an opening portion through which the shaft is inserted, and expands in a radial direction. A cover member is arranged at the plate body portion and covers the de-electrization device. A seal member is arranged between the shaft and the plate body portion at the opening portion. A through hole is arranged in the plate body portion and / or the cover member. The de-electrization device is housed in a housing space surrounded by the plate body portion and the cover member. The housing space communicates with the outside through the through hole.

Description

Technical Field

[0001] This invention relates to motors. Background Technology

[0002] Previously, techniques for discharging current from the shaft of rotating machinery such as motors using a discharge device were known. For example, the discharge device had contacts formed from molded carbon material. The contacts were housed in a guide sleeve. The contacts established electrical contact with a rotor contact surface formed on the periphery of the shaft through a load acted by a helical spring. Furthermore, a conductive connection was formed between the contacts and the grounding sleeve portion via the guide sleeve (see, for example, Japanese Patent Application Publication No. 2019-531679).

[0003] When the contacts come into contact with the periphery of the shaft, the contacts wear due to the rotation of the shaft, generating abrasive powder, such as carbon, from the contacts. To prevent the abrasive powder from entering the interior of the rotating machinery housing, it is necessary to seal the shaft and the housing, and house the discharge device in a space separate from the interior of the housing. Existing technical documents Patent documents

[0004] Patent Document 1: Japanese Patent Publication No. 2019-531679

[0005] When the discharge device is housed in a sealed space to prevent the scattering of abrasive particles, changes in internal pressure due to variations in temperature and other factors can create a pressure difference between the inside and outside of the space, potentially compromising the seal between the shaft and the housing. Summary of the Invention

[0006] The purpose of this invention is to eliminate the pressure difference between the inside and outside of the space where the electrostatic discharge device is housed.

[0007] An exemplary motor of the present invention includes a shaft, a rotor, a stator, a housing, and a current-eliminating device. The shaft extends axially along a rotation axis. The rotor is supported by the shaft and is rotatable with the shaft. The stator is disposed radially outward from the rotor. The housing houses the rotor and the stator. The current-eliminating device electrically connects the shaft to the housing. The housing has a plate portion, a cover component, a sealing component, and a through hole. The plate portion has an opening for insertion of one axial end of the shaft and extends radially. The cover component is disposed on one axial end face of the plate portion and covers the current-eliminating device. The sealing component is disposed at the opening between the shaft and the plate portion. The through hole is disposed on at least one of the plate portion and the cover component. The current-eliminating device is housed within a housing space enclosed by the plate portion and the cover component. The housing space communicates with the outside through the through hole.

[0008] According to the exemplary motor of the present invention, the pressure difference between the inside and outside of the space housing the electrostatic discharge device can be eliminated. Attached Figure Description

[0009] Figure 1 This is a conceptual diagram showing an example of the structure of a motor. Figure 2 This is a conceptual diagram showing an enlarged view of the main structural components of a motor. Figure 3 This is a schematic diagram showing an example of a vehicle equipped with a motor. Figure 4 This is a perspective view showing an example of the structure of the cover component and its interior. Figure 5 This is a cross-sectional view of the cover component and its interior from an axial perspective. Figure 6 This is a perspective view showing the cover component and other structural examples inside it. Figure 7 This is a conceptual diagram showing a first configuration example of the through hole, cylinder, and filter. Figure 8 This is a conceptual diagram showing a second configuration example of the through hole, cylinder, and filter. Figure 9 This is a conceptual diagram showing a third configuration example of the through hole, cylinder, and filter. Figure 10 This is a conceptual diagram showing a fourth configuration example of the through hole, cylinder, and filter. Figure 11 This is a conceptual diagram showing a fifth configuration example of the through hole, cylinder, and filter. Figure 12 This is a conceptual diagram showing a sixth configuration example of the through hole, cylinder, and filter. Figure 13 This is a conceptual diagram showing a seventh configuration example of the through hole, cylinder, and filter. Figure 14 This is a conceptual diagram showing the eighth configuration example, including the through hole, the cylindrical section, and the filter. Figure 15 This is a perspective view showing the cover component and its internal structure in a modified example. Figure 16 This is a conceptual diagram showing an enlarged view of the main structural components of the motor in a modified example. Detailed Implementation

[0010] Exemplary embodiments will now be described with reference to the accompanying drawings.

[0011] In this specification, the direction parallel to the first rotation axis J1 of the motor unit 1 is referred to as the "axial direction" of the motor 100. Regarding the axial direction, as follows... Figure 1As shown, the motor section 1 side is designated as one axial direction D1, and the power transmission device 3 side is designated as the other axial direction D2. Furthermore, the radial direction orthogonal to the specified axis is simply referred to as "radial," and the circumferential direction centered on the specified axis is simply referred to as "circumferential." In addition, in this specification, "parallel direction" includes not only perfectly parallel directions but also approximately parallel directions. Moreover, the term "extending along" a specified direction or plane includes not only strictly extending along the specified direction but also extending along a direction inclined at a range of less than 45° relative to the strictly specified direction.

[0012] <1. Implementation Method> Figure 1 This is a conceptual diagram showing a structural example of motor 100. Figure 2 This is a conceptual diagram showing an enlarged view of the main structural components of the motor 100. Figure 3 This is a schematic diagram showing an example of a vehicle 300 equipped with a motor 100. Additionally, Figure 1 and Figure 2 This is just a concept drawing; the configuration and dimensions of each part are not necessarily the same as the actual Motor 100. Furthermore, Figure 2 It is Figure 1 The enlarged view of part II enclosed by the dashed line. Figure 3 The vehicle 300 is also schematically shown.

[0013] In this embodiment, such as Figure 3 As shown, motor 100 is installed in a vehicle 300, such as a hybrid electric vehicle (HV), a plug-in hybrid electric vehicle (PHV), or an electric vehicle (EV), which uses at least one motor as its power source. Motor 100 serves as the power source for the aforementioned vehicle 300. Vehicle 300 includes motor 100 and battery 200. Battery 200 stores electricity supplied to motor 100. In the example of vehicle 300, motor 100 drives the left and right front wheels. Alternatively, motor 100 only needs to drive at least one wheel.

[0014] like Figure 1 As shown, the motor 100 includes a motor section 1, a shaft 2, a power transmission device 3, a housing 4, and a fluid circulation section 6. The shaft 2 extends axially along a first rotation axis J1 parallel to the horizontal direction. The shaft 2 is rotatable about the first rotation axis J1. The housing 4 houses the motor section 1, the shaft 2, and the power transmission device 3. For example, the housing 4 houses the rotor 11 and stator 12 of the motor section 1, which will be described later.

[0015] Additionally, the motor 100 also includes an anti-static device 7. The anti-static device 7 electrically connects the shaft 2 to the housing 4. The anti-static device 7 is fixed to the housing 4 and contacts the shaft 2. Figure 2As shown, the current removal device 7 of this embodiment also includes a conductive member 71, an elastic member 72, a retaining member 73, and a fixing member 74.

[0016] The conductive component 71 is formed using a conductive material. The front end of the conductive component 71 contacts the second shaft 23 of the shaft 2 (described later). In this embodiment, the conductive component 71 is brush-shaped, but it is not limited to this example and may also be a molded body. The material of the conductive component 71 is preferably a material with good sliding properties, and more preferably a material with a low coefficient of friction. For example, a composite resin containing conductive fillers such as carbon fibers or metals can be used as the material for the conductive component 71.

[0017] The elastic member 72 is housed inside the retaining member 73 in a compressed state. Due to its elasticity, the elastic member 72 pushes the conductive member 71 towards the second axis 23. In this embodiment, a spring coil is used as the elastic member 72, but it is not limited to this example; other components such as leaf springs or rubber may also be used.

[0018] The retaining member 73 is a bottomed cylindrical shape, housing a portion of the conductive member 71 and the elastic member 72 inside. The retaining member 73 holds the conductive member 71. Specifically, the retaining member 73 holds the end of the conductive member 71 on the side of the elastic member 72 so that it can move along the direction in which the retaining member 73 extends. In addition, the retaining member 73 telescopically holds the elastic member 72 in the direction in which the retaining member 73 extends.

[0019] The fixing member 74 secures the electrostatic discharge device 7 to the housing 4. In this embodiment, the fixing member 74 is mounted on the retaining member 73. Additionally, at least one fixing member 74 is fixed to the plate portion 433 (described later). Figure 4 However, it is not limited to this example; at least one fixing member 74 may also be fixed to the cover member 44 described later. That is, the fixing member 74 will hold the member 73 fixed to at least one of the plate body portion 433 and the cover member 44.

[0020] In addition, the fixing member 74 is conductive and is electrically connected to the conductive member 71. By fixing the fixing member 74 to the conductive plate part 433 or the cover part 44, the conductive member 71 is electrically connected to the outer casing 4.

[0021] <1-1. Motor Section 1> Next, refer to Figure 1 and Figure 2 Motor unit 1 is described below. Motor unit 1 is a DC brushless motor. Motor unit 1 is the drive source for motor 100, driven by electricity from an inverter (not shown). Motor unit 1 is an inner rotor type, with a rotor 11 rotatably arranged inside the stator 12. Figure 1 As shown, the motor unit 1 has a rotor 11 and a stator 12.

[0022] <1-1-1. Rotor 11> Rotor 11 is supported on shaft 2. Motor 100 includes rotor 11. Rotor 11 is rotatable with shaft 2. Specifically, rotor 11 is supported by first shaft 21, described later. Rotor 11 rotates by supplying power to stator 12 from power source (not shown) of motor 100. Rotor 11 has rotor core 111 and magnets 112. Rotor core 111 is formed, for example, by stacking thin sheet-like electromagnetic steel plates. Rotor core 111 is an axially extending cylinder fixed to the radially outer surface of first shaft 21. A plurality of magnets 112 are fixed to rotor core 111. The plurality of magnets 112 are arranged circumferentially with alternating magnetic poles.

[0023] Furthermore, the rotor core 111 has a rotor through-hole 1111. The rotor through-hole 1111 extends axially through the rotor core 111 and is connected to the first shaft through-hole 201. The rotor through-hole 1111 serves as a flow path for the fluid F. In this embodiment, the fluid F is a lubricant used to lubricate the various bearings and power transmission device 3 of the motor 100, such as oil like ATF (automatic transmission fluid). The motor 100 includes the fluid F. Additionally, the fluid F is also used as a refrigerant to cool the stator 12 and the bearings 4211, 4314, etc., described later.

[0024] When the rotor 11 rotates, the fluid F flowing through the hollow portion 211 of the first shaft 21 can flow into the rotor through-hole 1111 through the first shaft through-hole 201. Furthermore, the fluid F flowing into the rotor through-hole 1111 can flow out from both axial ends of the rotor through-hole 1111 towards the outside of the rotor core 111. The outflowing fluid F disperses towards the stator 12, cooling, for example, the coil portion 122 (especially the coil end 1221). Additionally, the outflowing fluid F disperses towards the bearings 4211, 4314, etc., which rotatably support the first shaft 21, lubricating and cooling the bearings 4211, 4314.

[0025] <1-1-2. Stator 12> The stator 12 is positioned radially outward compared to the rotor 11. The motor 100 includes a stator 12. The stator 12 has a stator core 121 and a coil portion 122. The stator 12 is held by a first outer casing 41, described later. The stator core 121 has a plurality of pole teeth (not shown) extending radially inward from the inner circumference of the annular yoke. The coil portion 122 is formed by winding a wire around the pole teeth through an insulator (not shown). The coil portion 122 has a coil end 1221 protruding from the axial end face of the stator core 121.

[0026] <1-2. Axis 2> like Figure 1 and Figure 2 As shown, shaft 2 is rotatably supported by housing 4 via bearings 4211, 4221, 4314, and 4611 (described later). That is, motor 100 includes bearings 4211, 4221, 4314, and 4611. Bearings 4211, 4221, 4314, and 4611 rotatably support the first shaft 21.

[0027] Shaft 2 has a first shaft 21. As described above, motor 100 includes shaft 2. The first shaft 21 is cylindrical and extends axially. Refrigerant flows inside the first shaft 21. Motor 100 also includes this refrigerant. In this embodiment, the refrigerant is a fluid F. Depending on the rotation of shaft 2, the refrigerant flowing inside the first shaft 21 can be supplied to stator 12 and bearings 4211, 4314, etc. through the first shaft through-hole 201 described later. Therefore, the stator 12 (especially the coil end 1221 of coil section 122) and bearings 4211, 4314, etc. can be cooled by the refrigerant.

[0028] The first shaft 21 has a hollow portion 211, a shaft sleeve portion 212, and an inlet 213. The shaft sleeve portion 212 extends axially along a first rotation axis J1. The hollow portion 211 is disposed inside the shaft sleeve portion 212. The inlet 213 is disposed on the other axial side D2 of the shaft sleeve portion 212 and is connected to the oil passage 465 of the gear cover portion 46 (described later). The fluid F (described later) flows into the hollow portion 211 from the oil passage 465 via the inlet 213.

[0029] Alternatively, the first shaft 21 can be divided in the middle of its axial direction. When the first shaft 21 can be divided, the divided first shafts 21 can be connected, for example, by spline engagement. Alternatively, a threaded coupling structure using male and female threads can be employed. Furthermore, it can be joined by pressing, welding, or other fixing methods. When using pressing, welding, or other fixing methods, a combination of serrated recesses and protrusions extending axially can be used. By employing this structure, rotation can be reliably transmitted.

[0030] Additionally, shaft 2 also includes a cover 22, a second shaft 23, a first shaft through hole 201, and a second shaft through hole 202. The cover 22 is disposed at one axial end of the first shaft 21. The second shaft 23 extends from the cover 22 axially in one direction (D1). The first shaft through hole 201 radially penetrates the first shaft 21. The second shaft through hole 202 communicates with the interior of the first shaft 21 and the external space of shaft 2. The second shaft through hole 202 is disposed at a position axially closer (D1) than the first shaft through hole 201. The first shaft 21, cover 22, and second shaft 23 are conductive and, in this embodiment, are made of metal. The second shaft 23 is in contact with the current-eliminating device 7.

[0031] <1-2-1. Second Axis 23> The second shaft 23 extends axially along the first rotation axis J1. Furthermore, the second shaft 23 is an example of the "shaft" of the present invention. The outer diameter of the second shaft 23 is smaller than the outer diameter of the first shaft 21. The current-eliminating device 7 contacts the second shaft 23. In this embodiment, the current-eliminating device 7 contacts the radially outer surface of the second shaft 23, but it is not limited to this example; it may also contact one axial end face of the second shaft 23.

[0032] <1-2-2. First shaft through hole 201> Furthermore, a first shaft through-hole 201 is disposed in the shaft cylinder portion 212 and radially penetrates the shaft cylinder portion 212. When the shaft 2 rotates, the fluid F inside the first shaft 21 flows out through the first shaft through-hole 201 from the hollow portion 211 to the outside of the first shaft 21 due to centrifugal force. In this embodiment, as... Figure 1 As shown, the first shaft through hole 201 is located at a position D2 on one side of the axial direction and D1 on the other side of the axial direction of the rotor 11, and is connected to the rotor through hole 1111 as described above.

[0033] However, not limited to Figure 1 For example, the first shaft through hole 201 can be configured at a position D1 axially relative to one end of the rotor 11, or at a position D2 axially relative to the other end of the rotor 11. That is, at least a portion of the first shaft through hole 201 can be configured at at least one of these positions.

[0034] <1-2-3. Second shaft through hole 202> The second shaft through hole 202 is disposed in at least one of the cover portion 22 and the shaft sleeve portion 212. In this embodiment, the second shaft through hole 202 is disposed in the cover portion 22 and extends through the cover portion 22 axially (see, for example, reference...). Figure 2 In this way, compared to the case where the second shaft through-hole 202 is disposed on the first shaft 21, it is easier to draw air into the interior of the first shaft 21. Furthermore, if multiple second shaft through-holes 202 function as air intakes are provided, the amount of air drawn into the first shaft 21 and the flow of the drawn-in airflow can be appropriately adjusted according to the number and configuration of the second shaft through-holes 202. However, it is not limited to the above example; the second shaft through-hole 202 may also be disposed on the first shaft 21, penetrating the first shaft 21 radially.

[0035] Furthermore, the number of second shaft through holes 202 can be one or more. In the latter case, the second shaft through holes 202 can be arranged at equal or different intervals in the circumferential direction.

[0036] <1-2-4. Cover 22> In this embodiment, such as Figure 2 As shown, the cover portion 22 is plate-shaped, extending radially from the first axis of rotation J1. However, it is not limited to this example; the shape of the cover portion 22 may also be other than plate-shaped, for example, it may be a conical shape that extends radially outward toward one axial direction D1 or the other axial direction D2.

[0037] <1-3. Power Transmission Device 3> Next, refer to Figure 1 The power transmission device 3 will be described in detail. The power transmission device 3 transmits the power of the motor unit 1 to the output shaft Ds. The power transmission device 3 includes a reduction gear 31 and a differential gear 32.

[0038] <1-3-1. Speed ​​Reduction Device 31> The reduction gear 31 is connected to the shaft 2. The reduction gear 31 has the function of reducing the rotational speed of the motor 1, thereby increasing the torque output from the motor 1 and the reduction ratio accordingly. The reduction gear 31 transmits the torque output from the motor 1 to the output shaft Ds. That is, the power transmission device 3 is connected to the other side D2 of the shaft 2, which rotates around the first rotation axis J1 extending in the horizontal direction.

[0039] The reduction gear 31 has a main drive gear 311, an intermediate driven gear 312, a final drive gear 313, and an intermediate shaft 314. The torque output from the motor unit 1 is transmitted to the gear ring 321 of the output shaft Ds via the shaft 2, the main drive gear 311, the intermediate driven gear 312, the intermediate shaft 314, and the final drive gear 313.

[0040] The main drive gear 311 is disposed on the outer circumferential surface of the shaft 2. The main drive gear 311 can be the same component as the shaft 2, or it can be another component that is securely fixed. The main drive gear 311 rotates together with the shaft 2 around the first rotation axis J1.

[0041] The intermediate shaft 314 extends along a second rotation axis J2 parallel to the first rotation axis J1. Both ends of the intermediate shaft 314 are supported by a first intermediate bearing 4231 and a second intermediate bearing 4621, enabling it to rotate about the second rotation axis J2. An intermediate driven gear 312 and a final-stage drive gear 313 are disposed on the outer circumferential surface of the intermediate shaft 314. The intermediate driven gear 312 can be the same component as the intermediate shaft 314, or it can be another component that is securely fixed in place.

[0042] The intermediate driven gear 312 and the final stage drive gear 313 rotate integrally with the intermediate shaft 314 around the second rotation axis J2. The intermediate driven gear 312 meshes with the main drive gear 311. The final stage drive gear 313 meshes with the gear ring 321 of the output shaft Ds.

[0043] The torque of shaft 2 is transmitted from the main drive gear 311 to the intermediate driven gear 312. Then, the torque transmitted to the intermediate driven gear 312 is transmitted to the final drive gear 313 via the intermediate shaft 314. Furthermore, the torque is transmitted from the final drive gear 313 to the output shaft Ds.

[0044] <1-3-2. Differential Device 32> The differential device 32 is mounted on the output shaft Ds. The differential device 32 has a gear ring 321. The gear ring 321 transmits the output torque of the motor unit 1 to the output shaft Ds. The output shaft Ds has axles Ds1 and Ds2 respectively mounted on the left and right sides of the differential device 32. For example, when the vehicle is turning, the differential device 32 absorbs the speed difference between the left and right axles and transmits torque to the left and right axles Ds1 and Ds2.

[0045] The lower end of the gear ring 321 is disposed inside the fluid storage section P (described later) of the accumulated fluid F (see reference). Figure 1 The fluid F is stored in the lower part of the gear housing space 402. Therefore, when the gear ring 321 rotates, the fluid F is agitated by the teeth of the gear ring 321. The fluid F agitated by the gear ring 321 lubricates or cools the gears and bearings of the power transmission device 3. In addition, a portion of the agitated fluid F is stored in the tray portion 464 (described later) and is also used for cooling the motor portion 1 via the shaft 2.

[0046] <1-4. Outer Shell 4> Next, refer to Figure 1 and Figure 2 The housing 4 is described in detail below. The housing 4 includes a first housing cylindrical portion 41, a side plate portion 42, a motor cover portion 43, a cover member 44, a second housing cylindrical portion 45, and a gear cover portion 46. Furthermore, the first housing cylindrical portion 41, the side plate portion 42, the motor cover portion 43, the second housing cylindrical portion 45, and the gear cover portion 46 are formed, for example, using a conductive material; in this embodiment, they are formed using metallic materials such as iron, aluminum, or their alloys. Additionally, to suppress dissimilar metal contact corrosion in the contact portions, they are preferably formed using the same material. However, this is not a limitation to this example; they may also be formed using materials other than metallic materials, and at least some of them may be formed using different materials.

[0047] Furthermore, as described above, the housing 4 houses the rotor 11, stator 12, and bearings 4211 and 4314 of the motor unit 1. Specifically, the housing 4 has a motor housing space 401. The motor housing space 401 is a space enclosed by the first housing cylindrical portion 41, the side plate portion 42, and the motor cover portion 43, and houses the rotor 11, stator 12, and bearings 4211 and 4314.

[0048] In addition, the outer casing 4 houses the power transmission device 3. Specifically, the outer casing 4 has a gear storage space 402. The gear storage space 402 is a space enclosed by the side plate portion 42, the second outer casing cylinder portion 45, and the gear cover portion 46, and houses the reduction gear 31 and the differential device 32, etc.

[0049] A fluid storage section P for storing fluid F is disposed in the lower part of the gear housing space 402. A portion of the differential device 32 is immersed in the fluid storage section P. The fluid F stored in the fluid storage section P is agitated by the operation of the differential device 32 and supplied to the interior of the gear housing space 402. For example, when the gear ring 321 of the differential device 32 rotates, the fluid F is agitated by the tooth surface of the gear ring 321. A portion of the agitated fluid F is supplied to the reduction gear 31 and each gear and bearing of the differential device 32 in the gear housing space 402 for lubrication. In addition, another portion of the agitated fluid F is supplied to the interior of the shaft 2 and to the rotor 11 and stator 12 of the motor unit 1 and each bearing in the gear housing space 402 for cooling and lubrication.

[0050] <1-4-1. First Outer Shell Section 41> The first outer casing cylindrical portion 41 is cylindrical in shape and extends axially. The motor portion 1 and the storage unit 64 (described later) are disposed inside the first outer casing cylindrical portion 41. In addition, the stator core 121 is fixed to the inner surface of the first outer casing cylindrical portion 41.

[0051] <1-4-2. Side Panel Section 42> The side plate portion 42 extends in a direction perpendicular to the first rotation axis J1, covering the other axial end of the first outer casing portion 41. In this embodiment, the first outer casing portion 41 and the side plate portion 42 are different parts of a single component. By forming them integrally, their rigidity can be improved. However, this is not limited to this example; the first outer casing portion 41 and the side plate portion 42 can also be different components.

[0052] The side plate portion 42 has a side plate through hole 4201 for inserting the shaft 2 and a first output shaft through hole 4202. The side plate through hole 4201 and the first output shaft through hole 4202 extend axially through the side plate portion 42. The first shaft 21 is inserted into the side plate through hole 4201. An axle Ds1 with an output shaft Ds inserted into the first output shaft through hole 4202 is inserted into the first output shaft through hole 4202. An oil seal (not shown) is disposed in the gap between the output shaft Ds and the first output shaft through hole 4202 to seal between the two. In addition, the term "sealing" refers to the degree to which different components are in close contact with each other, for example, to the degree that the fluid F inside the component does not leak to the outside and to the degree that foreign objects such as water and dust from the outside do not enter. The same applies to the sealing below.

[0053] Additionally, the side plate portion 42 also has bearing retaining portions 421, 422, 423, and 424. Bearing retaining portion 421 is disposed in the motor housing space 401 on one axial end face of the side plate portion 42, retaining bearing 4211. Bearing retaining portions 422, 423, and 424 are disposed in the gear housing space 402 (described later) on the other axial end face of the side plate portion 42. Bearing retaining portion 422 is disposed along the outer edge of the other axial end of the side plate through hole 4201, retaining bearing 4211. Bearing retaining portion 423 retains the first intermediate bearing 4231. Bearing retaining portion 424 is disposed along the outer edge of the other axial end of the first output shaft through hole 4202, retaining the first output bearing 4241.

[0054] <1-4-3. Motor Cover 43> The motor cover 43 is mounted on one axial end of the first housing cylinder 41. The motor cover 43 can be fixed to the first housing cylinder 41, for example, by using screws, but is not limited to this; methods such as screwing or pressing can be widely used to securely fix the plate portion 433 to the first housing cylinder 41. Thus, the motor cover 43 can fit tightly against one axial end of the first housing cylinder 41. Furthermore, "tightly fitting" refers to a degree of airtightness that prevents the fluid F inside the component from leaking to the outside and prevents external foreign matter such as water and dust from entering. The same applies to the following regarding tight fitting.

[0055] like Figure 2 As shown, the motor cover 43 has a cover 431, a cylindrical part 432, a plate part 433, and a bearing retaining part 434. In other words, the housing 4 has a cover 431, a cylindrical part 432, and a plate part 433.

[0056] <1-4-3-1. Cover 431> The cover portion 431 extends in a direction intersecting the first rotation axis J1, covering one axial end of the first outer casing portion 41. The cover portion 431 has an opening 4311 through which the shaft 21 is inserted. The opening 4311 extends axially through the cover portion 431. The first shaft 21 is inserted through the opening 4311. Additionally, the cover portion 431 also has a bearing retainer 4312 and a sealing member 4313. The bearing retainer 4312 is disposed in the motor housing space 401 on the other axial end face of the cover portion 431. The bearing retainer 4312 is disposed along the outer edge of the other axial end of the opening 4311, retaining the bearing 4314. The sealing member 4313 is disposed in the opening 4311 between the first shaft 21 and the cover portion 431, sealing the two together. By sealing the opening 4311 with the sealing member 4313, foreign objects such as wear powder generated in the electrostatic eliminator 7 can be prevented from entering the motor storage space 401 containing the stator 12 through the opening 4311.

[0057] <1-4-3-2. Cylindrical section 432> The cylindrical portion 432 is cylindrical in shape, surrounding the first rotation axis J1, and extends from one axial end of the cover portion 431 to one axial end D1.

[0058] <1-4-3-3. Plate Body 433> The plate portion 433 is conductive, extends in a direction intersecting the first rotation axis J1, and is mounted at one axial end of the cylindrical portion 432. As described above, the outer casing 4 has a plate portion 433. In this embodiment, the plate portion 433 has an opening 4331 through which the second shaft 23 of the shaft 2 is inserted, and extends radially. Specifically, the plate portion 433 is positioned further axially to one side D1 than the stator 12 and the bearing 4341 described later. The opening 4331 is provided at the plate portion 433. The opening 4331 extends axially through the plate portion 433. In addition, a current-eliminating device 7 is provided at one axial end of the plate portion 433.

[0059] In addition, the plate body portion 433 also has a fixing portion 4332, a rib 4333, and a wall portion 4334. The fixing portion 4332 and the rib 4333 protrude from the plate body portion 433 in one axial direction D1. A fixing member 74 of the electrostatic elimination device 7 is fixed at the fixing portion 4332. For each fixing portion 4332, a plurality of ribs 4333 extend radially from the fixing portion 4332. In addition, the end of each rib 4333 on the fixing portion 4332 side is connected to the outer surface of the fixing portion 4332. The wall portion 4334 is disposed between the second shaft 23 of the shaft 2 and the through hole 443 described later when viewed from the axial direction.

[0060] <1-4-3-4. Bearing Retaining Part 434> The bearing retainer 434 is disposed at the other end face of the plate body 433 along the outer edge of one end of the opening 4331 in the axial direction, and retains the bearing 4341.

[0061] <1-4-3-5. Sealing component 435> A sealing member 435 is disposed at the opening 4331 of the plate body portion 433. The motor 100 includes an annular sealing member 435. The sealing member 435 is disposed at the opening 4331 between the second shaft 23 and the plate body portion 433, sealing the two together. The radially inner end of the plate body portion 433 along the outer edge of the opening 4331 contacts the radially outer side surface of the second shaft 23 of the shaft 2 via the sealing member 435. The radially outer end of the sealing member 435 contacts the radially inner side surface of the opening 4331. The radially inner end of the sealing member 435 contacts the radially outer side surface of the second shaft 23. By sealing the opening 4331 with the sealing member 435, wear dust generated from the de-energizing device 7 disposed on one axial end face of the plate body portion 433 can be prevented from entering the other axial side D2 of the plate body portion 433 through the opening 4331. Therefore, wear dust can be prevented from entering the interior of the housing 4 containing the stator 12, etc. For example, it can also prevent abrasive powder from entering the hollow portion 211 of the first shaft 21 through the second shaft through hole 202. Therefore, it can prevent abrasive powder from entering the motor housing space 401 with the flow of fluid F in the hollow portion 211.

[0062] <1-4-4. Cover Component 44> The cover member 44 is disposed on one axial end face of the plate body portion 433. As described above, the housing 4 has the cover member 44. The cover member 44 covers the current-eliminating device 7. That is, the current-eliminating device 7 is housed in the housing space 440 formed by the plate body portion 433 and the cover member 44. The wear powder of the conductive member 71 generated at the contact portion between the second shaft 23 of the shaft 2 and the conductive member 71 can be housed in the housing space 440. Therefore, it is possible to prevent the wear powder from scattering to the outside of the housing space 440.

[0063] The storage space 440 includes a lower space 4401 with a predetermined width. The lower space 4401 is disposed vertically below the opening 4331 of the plate body portion 433. In this way, wear powder generated at the contact portion between the second shaft 23 of the shaft 2 and the electrostatic removal device 7 can be accumulated in the lower space 4401. By making the lower space 4401 sufficiently wide, it is possible to prevent the wear powder accumulated in the lower part of the storage space 440 from overflowing into the opening 4331 between the second shaft 23 and the plate body portion 433.

[0064] The cover component 44 can be installed onto the plate body portion 433, for example, by threaded fixation, but is not limited thereto. In this embodiment, the cover component 44 and the plate body portion 433 together form a storage space 440. The storage space 440 is a space surrounded by the cover component 44 and the plate body portion 433, which houses the opening portion 4331 and the power elimination device 7.

[0065] The cover component 44 has a first cover portion 441 and a second cover portion 442. The first cover portion 441 covers the current-eliminating device 7. The second cover portion 442 is disposed radially outward from the first cover portion 441. Specifically, the first cover portion 441 and the second cover portion 442 extend in a direction intersecting the first rotation axis J1. The first cover portion 441 is disposed axially D1 further than the opening portion 4331 and the current-eliminating device 7. The first cover portion 441 has a plate portion 4411 extending in a direction intersecting the first rotation axis J1. In addition, the second cover portion 442 is disposed axially D2 away from the first cover portion 441. The radially inner end portion of the second cover portion 442 is connected to the radially outer end portion of the first cover portion 441, and the radially outer end portion of the second cover portion 442 is connected to one axial end face of the plate body portion 433. A lower space 4401 is provided between the plate body portion 433 and the second cover portion 442. Thus, since the second cover 442 is positioned D2 axially opposite to the first cover 441, space in the outer casing 4 can be saved axially. Furthermore, a portion of the space between the plate portion 433 and the second cover 442 can be used as a lower space 4401 for accumulating wear powder.

[0066] <1-4-4-1. Through hole 443, cylinder 444 and filter 445> In addition, in this embodiment, the cover component 44 also has a through hole 443, a cylindrical portion 444, and a filter 445. Referring here... Figure 2 and Figures 4 to 14 The through hole 443, the cylindrical part 444 and the filter 445 are described.

[0067] Figure 4 This is a perspective view showing an example of the structure of the cover component 44 and its interior. Figure 5 This is a cross-sectional view of the cover component 44 and its interior, viewed from the axial direction. Figure 4 In order to facilitate observation of the arrangement of the second shaft 23 and the current removal device 7, the cover component 44 is shown in a transparent manner. Additionally, Figure 5 The cross-sectional structure of the second shaft 23, the electrostatic eliminator 7, and the cover component 44 is shown by cutting them with an imaginary plane perpendicular to the axial direction. Additionally, in Figure 4 and Figure 5 In the diagram, the symbol Dv indicates the vertical direction, and the symbol Dh indicates the horizontal direction. In the vertical direction Dv, the direction from the bottom to the top of the diagram is vertically upward, and the direction from the top to the bottom is vertically downward. Figure 4 and Figure 5 In the middle, the axial direction, the vertical direction Dv, and the horizontal direction Dh are perpendicular to each other.

[0068] Figures 7 to 14 These are conceptual diagrams showing the first to eighth configuration examples, respectively, of the through hole 443, the cylindrical portion 444, and the filter 445. Additionally, Figures 7 to 14This is just a concept drawing; the configuration and dimensions of each part are not necessarily the same as the actual Motor 100. Furthermore, Figures 7 to 14 Corresponding to Figure 1 Part II, enclosed by the dashed line.

[0069] A through-hole 443 connects the receiving space 440 to its exterior. The housing 4 has a through-hole 443. In this embodiment, the through-hole 443 is disposed in the first cover portion 441 (see, for example, reference 443). Figure 2 and Figures 4 to 9 However, the configuration of the through hole 443 is not limited to the example of this embodiment. The through hole 443 can also be configured in the second cover portion 442 (see, for example, refer to...). Figure 10 Additionally, the through hole 443 can be disposed only in the plate body portion 433 (for example, see reference 433). Figure 11 and Figure 12 It can also be configured on both the plate body 433 and the cover component 44 (see, for example, reference). Figure 13 That is, the through hole 443 can be disposed on at least one of the plate body part 433 and the cover part 44.

[0070] The storage space 440 for housing the static eliminator 7 is connected to the outside via a through hole 443. Because the storage space 440 is connected to the outside via the through hole 443, changes in internal pressure within the storage space 440 due to temperature variations or other factors can be prevented. Therefore, the pressure difference between the inside and outside of the storage space 440 for housing the static eliminator 7 can be eliminated.

[0071] The storage space 440 is connected to the outside through a through hole 443 and a filter 445. The housing 4 has a filter 445. This prevents wear dust from the conductive parts 71 generated by the static elimination device from being discharged from the inside of the storage space 440 to the outside of the storage space 440, and also eliminates the pressure difference between the inside and outside of the storage space 440. In addition, it also prevents foreign objects from entering the inside of the storage space 440 from the outside.

[0072] In this embodiment, the through hole 443 extends axially. However, it is not limited to this example; the through hole 443 may also extend in a direction other than the axial direction, for example, as shown in the example below. Figure 9 It extends radially as shown.

[0073] In addition, such as Figures 10 to 13 As shown, when viewed axially, the through hole 443 can also overlap with the second cover portion 442. Specifically, the through hole 443 can be provided in the second cover portion 442 (see...). Figure 10 Alternatively, the through hole 443 can also be disposed on the plate portion 433 and axially opposite to the second cover portion 442 (see reference). Figures 11 to 13This allows the position of the through hole 443 to be radially further away from the contact portion between the second shaft 23 of shaft 2 and the electrostatic removal device 7. Therefore, abrasive particles generated at the contact portion are less likely to reach the through hole 443. Consequently, abrasive particles are less likely to be discharged outside the housing space 440. Furthermore, when the housing space 440 is connected to the outside via the filter 445, clogging of the filter 445 caused by abrasive particles reaching the through hole 443 can be suppressed. However, these examples do not preclude a structure where the through hole 443 is located in the plate portion 433 and axially opposite the first cover portion 441.

[0074] Preferably, the through hole 443 is positioned vertically above the contact portion between the second shaft 23 of the shaft 2 and the electrostatic removal device 7 (see reference). Figure 4 and Figure 5 The abrasive powder generated at the aforementioned contact portion tends to fall vertically downwards due to gravity. Therefore, by positioning the through hole 443 vertically above the contact portion, it is possible to prevent the abrasive powder from being discharged into the storage space 440 through the through hole 443. Furthermore, this example does not preclude a structure where the through hole 443 is not positioned vertically above the contact portion.

[0075] Furthermore, in this embodiment, viewed from the vertical direction Dv, in a direction perpendicular to the axial direction and parallel to the horizontal direction Dh, the contact portion of the electrostatic remover 7, separated from the second shaft 23 of the shaft 2, is positioned on the side opposite to the through hole 443 (see reference). Figure 4 and Figure 5 The abrasive particles generated at the aforementioned contact portion may sometimes move towards the through hole 443 due to the airflow caused by the pressure difference inside and outside the storage space 440. Viewed axially, by positioning the electrostatic eliminator 7 at a position away from the through hole 443 and the aforementioned contact portion, the abrasive particles moving towards the through hole 443 are less likely to accumulate on the electrostatic eliminator 7.

[0076] Furthermore, this example does not exclude the following structure: when viewed from the vertical direction Dv, in a direction perpendicular to the axial direction and parallel to the horizontal direction Dh, the current-removing device 7 is not positioned on the side opposite to the through hole 443, separated by the aforementioned contact portion. For example, as... Figure 6As shown, the current-eliminating device 7 can also be positioned closer to the through hole 443 than the contact portion described above. In this case, viewed from the vertical direction Dv, in a direction perpendicular to the axial direction and parallel to the horizontal direction Dh, the current-eliminating device 7 can also be positioned between the contact portion of the shaft 2 and the current-eliminating device 7 and the through hole 443. By arranging the current-eliminating device 7 between the contact portion and the through hole 443, the through hole 443 can be moved significantly away from the contact portion while the current-eliminating device 7 is close to the through hole 443. Therefore, the through hole 443 and the current-eliminating device 7 can be arranged compactly, and the wear particles generated at the contact portion are less likely to move into the through hole 443.

[0077] Furthermore, as is preferred in this embodiment, when viewed axially, a wall portion 4334 is disposed between the second shaft 23 of the shaft 2 and the through hole 443 (see reference). Figures 4 to 6 The outer casing 4 has a wall portion 4334. Specifically, the wall portion 4334 protrudes axially in one direction (D1) from the plate portion 433. However, it is not limited to this example; the wall portion 4334 may also protrude axially in the other direction (D2) from the cover member 44. That is, the wall portion 4334 protrudes from one direction between the plate portion 433 and the cover member 44. Furthermore, the wall portion 4334 extends in a direction perpendicular to the axial direction and intersecting a direction from one of the second shaft 23 and the through hole 443 towards the other. By distributing the wall portion 4334 between the through hole 443 and the second shaft 23, abrasive powder generated at the contact portion between the second shaft 23 and the electrostatic discharge device 7 is less likely to move towards the through hole 443. Therefore, abrasive powder is less likely to be discharged through the through hole 443 to the outside of the receiving space 440. Furthermore, this embodiment does not exclude a structure where the wall portion 4334 is not disposed between the through hole 443 and the second shaft 23. For example, the wall portion 4334 may be omitted.

[0078] The cylindrical portion 444 extends from the outer edge of the through hole 443. The outer casing 4 has the cylindrical portion 444. The interior of the cylindrical portion 444 is connected to the through hole 443.

[0079] In this embodiment, the cylindrical portion 444 is disposed on the first cover portion 441. Furthermore, the cylindrical portion 444 is disposed outside the receiving space 440, extending axially in one direction D1 from the outer edge of the through hole 443 (see, for example, reference...). Figure 7 However, the configuration of the cylinder 444 is not limited to this example.

[0080] For example, the cylindrical portion 444 can also be disposed inside the storage space 440, extending axially in the opposite direction D2 from the outer edge of the through hole 443 disposed in the first cover portion 441 (see, for example, reference). Figure 8 ).

[0081] Furthermore, when the through hole 443 extends radially, the cylindrical portion 444 can extend radially outward from the outer edge of the through hole 443 disposed in the first cover portion 441 (see reference). Figure 9 It can also extend radially inward from the outer edge of the through hole 443.

[0082] Alternatively, the cylindrical portion 444 can also be disposed on the second cover portion 442. In this case, the cylindrical portion 444 can also be disposed outside the storage space 440, extending axially in one direction D1 from the outer edge of the through hole 443 disposed on the second cover portion 442 (see, for example, reference). Figure 10 ).

[0083] Alternatively, the cylindrical portion 444 can also be disposed on the plate portion 433. In this case, the cylindrical portion 444 can also be disposed inside the storage space 440, extending axially in one direction D1 from the outer edge of the through hole 443 disposed on the plate portion 433 (for example, see reference). Figure 11 Alternatively, the cylindrical portion 444 may be disposed outside the storage space 440, extending axially in the opposite direction D2 from the outer edge of the through hole 443 disposed in the plate portion 433 (see, for example, reference). Figure 12 ).

[0084] Alternatively, the cylindrical portion 444 can also be disposed on both the plate portion 433 and the cover portion 44 (see, for example, reference). Figure 13 ).

[0085] Next, in this embodiment, the filter 445 is disposed in the cylindrical portion 444. In this way, compared with the case where the filter 445 is disposed inside the through hole 443, the filter 445 can be disposed more easily.

[0086] In addition, in this embodiment, the filter 445 is also disposed at the front end of the cylindrical portion 444. This makes it easier to configure the filter 445.

[0087] However, the configuration of filter 445 is not limited to the examples described above. For example, filter 445 may also be configured inside the through hole 443. Alternatively, filter 445 may be installed at the other end of a flexible hose, tube, or other pipe component 446, one end of which is connected to the front end of the cylindrical portion 444 (see reference). Figure 14 ).

[0088] <1-4-5. Second outer casing section 45> The second outer casing cylindrical portion 45 is cylindrical in shape and extends axially. A power transmission device 3 is disposed inside the second outer casing cylindrical portion 45. One axial end of the second outer casing cylindrical portion 45 is connected to and covered by the side plate portion 42.

[0089] <1-4-6. Gear Cover 46> The gear cover portion 46 extends in a direction intersecting the first rotation axis J1 and is detachably mounted to one axial end of the second housing cylinder portion 45. In this embodiment, the second housing cylinder portion 45 and the gear cover portion 46 are different parts of a single component. However, this is not limited to this example; the second housing cylinder portion 45 and the gear cover portion 46 may also be different components. Furthermore, the mounting of the gear cover portion 46 to the second housing cylinder portion 45 can be exemplified by fixing with screws, but is not limited to this; methods such as screwing in or pressing in can be widely used to securely fix the gear cover portion 46 to the second housing cylinder portion 45. Thus, the gear cover portion 46 can be tightly fitted to one axial end of the second housing cylinder portion 45.

[0090] The gear cover portion 46 has a second output shaft through hole 460. The center of the second output shaft through hole 460 is aligned with the third rotation axis J3. An output shaft Ds is inserted into the second output shaft through hole 460. An oil seal (not shown) is disposed in the gap between the other output shaft Ds and the second output shaft through hole 460.

[0091] Additionally, the gear cover portion 46 also has bearing retaining portions 461, 462, and 463. The bearing retaining portions 461, 462, and 463 are disposed in the gear portion receiving space 402 on the opposite axial end face of the gear cover portion 46. Bearing retaining portion 461 retains bearing 4611. Bearing retaining portion 462 retains the second intermediate bearing 4621. Bearing retaining portion 463 is disposed along the outer edge of the opposite axial end of the second output shaft through hole 460, retaining the second output bearing 4631.

[0092] Additionally, the gear cover portion 46 has a tray portion 464 and an oil passage 465. The tray portion 464 is disposed on one axial end face of the gear cover portion 46 and has a recessed portion that is recessed vertically downward. The tray portion 464 can store the fluid F stirred up by the gear ring 321. The oil passage 465 is the passage for the fluid F and connects the tray portion 464 to the inlet 213 of the shaft 2. The fluid F stored in the tray portion 464 is supplied to the oil passage 465 and flows into the hollow portion 211 from the inlet 213 at the other axial end of the shaft 2.

[0093] <1-5. Fluid Circulation Section 6> Next, the fluid circulation unit 6 will be described. The fluid circulation unit 6 includes a piping unit 61, a pump 62, a cooler 63, and a reservoir 64.

[0094] The piping section 61 connects the pump 62 and the reservoir 64 disposed inside the first housing section 41, supplying fluid F to the reservoir 64. The pump 62 draws in fluid F accumulated in the lower region of the gear receiving space 402. The pump 62 is an electric pump, but is not limited to it. For example, it may be a structure driven by a portion of the power from the shaft 2 of the motor 100.

[0095] A cooler 63 is disposed between the pump 62 and the reservoir 64 in the piping section 61. That is, the fluid F drawn by the pump 62 is transported to the reservoir 64 after passing through the cooler 63 via the piping section 61. A refrigerant, such as water supplied from the outside, is supplied to the cooler 63. The cooler 63 performs heat exchange between the refrigerant and the fluid F, thereby reducing the temperature of the fluid F.

[0096] The reservoir 64 is a tray disposed inside the motor housing space 401, vertically above the stator 12. A drip hole is formed at the bottom of the reservoir 64, through which fluid F is dripped to cool the motor section 1. The drip hole is formed, for example, above the coil end 1221 of the coil section 122 of the stator 12, and the coil section 122 is cooled by the fluid F.

[0097] <2. Variations of the Implementation Method> Next, refer to Figure 15 and Figure 16 Hereinafter, variations of the embodiments will be described. The structures in the variations that differ from the embodiments described above will be described. Furthermore, the same symbols are used to denote the same constituent elements as in the embodiments described above, and their descriptions are omitted.

[0098] Figure 15 This is a perspective view showing the cover component 44 in the modified example and its internal structure. Figure 16 This is a conceptual diagram showing an enlarged view of the main structural components of the motor 100 in a modified example. Additionally, in Figure 15 In order to facilitate observation of the arrangement of the second shaft 23 and the electrostatic eliminator 7, the cover component 44 is shown in a transparent manner. Additionally, in Figure 15 In the diagram, the symbol Dv indicates the vertical direction, and the symbol Dh indicates the horizontal direction. In the vertical direction Dv, the direction from the bottom to the top of the diagram is vertically upward, and the direction from the top to the bottom is vertically downward. Figure 15 In this context, the axial direction, the vertical direction Dv, and the horizontal direction Dh are perpendicular to each other. Additionally, Figure 16 Showing the use of included Figure 15 The cross-sectional structure of the main part of the motor 100 is cut by a single-dotted dashed line XVI-XVI and an imaginary plane parallel to the first axis of rotation J1.

[0099] In a modified example, the cover member 44 has a first recess 447. The first recess 447 is recessed from the plate portion 4411 in the opposite axial direction D2. That is, the first recess 447 is disposed in the first cover portion 441 in this embodiment. However, it is not limited to this example, and the first recess 447 may also be disposed in the second cover portion 442. At least one through hole 443 is provided in the first recess 447. In this embodiment, the through hole 443 is disposed on the bottom surface of the first recess 447 facing the axial direction D1. At least a portion of the filter 445 covering the through hole 443 is housed in the first recess 447. That is, at least a portion of the filter 445 covering the through hole 443 of the first recess 447 is disposed in the opposite axial direction D2 of the plate portion 4411. In this way, the filter 445 covering the through hole 443 of the first recess 447 can be further disposed in the opposite axial direction D2. Therefore, it is possible to prevent an increase in the axial dimension of the motor 100 caused by the configuration of the filter 445.

[0100] Furthermore, when viewed radially, at least a portion of the filter 445 overlaps with the current-removing device 7. That is, the axial position of at least a portion of the filter 445 is the same as that of the current-removing device 7. In this way, the filter 445 and the plate portion 4411 can be further arranged in the opposite axial direction D2, thereby further reducing the axial dimension of the motor 100.

[0101] Furthermore, the motor cover portion 43 also has a second recess 436. In other words, the housing 4 has a second recess 436. The second recess 436 is disposed on one axial side D1 of the plate portion 433 and recessed in the other axial side D2. At least a portion of the power-eliminating device 7 is housed in the second recess 436. By disposing at least a portion of the power-eliminating device 7 in the second recess 436 disposed on one axial side D1 of the plate portion 433, the power-eliminating device 7 can be further disposed in the other axial side D2. Therefore, the axial dimension of the motor 100 can be reduced, further miniaturizing it.

[0102] Furthermore, the second recess 436 accommodates at least a portion of the filter 445. This allows the current removal device 7 to be further positioned on the other axial side, D2. Therefore, the axial dimension of the motor 100 can be reduced, resulting in further miniaturization.

[0103] In addition, Figure 15 and Figure 16 In this configuration, a current-removing device 7 is arranged between the second shaft 23, the through hole 443, and the filter 445. More specifically, viewed from the vertical direction Dv, the current-removing device 7 is positioned between the contact portion of the shaft 2 and the through hole 443 in a direction perpendicular to the axial direction and parallel to the horizontal direction Dh. However, their arrangement is not limited to... Figure 15 and Figure 16Examples. For instance, the current-eliminating device 7 can also be positioned on the opposite side of the through hole 443 and the filter 445, sandwiching the contact portion of the second shaft 23 of the shaft 2 and the current-eliminating device 7 (see, for example, reference). Figure 4 and Figure 5 ).

[0104] <3. Other> The embodiments of the present invention have been described above. However, the scope of the present invention is not limited to the embodiments described above. The present invention can be implemented with various modifications to the above embodiments without departing from the spirit of the invention. Furthermore, the matters described in the above embodiments can be appropriately combined arbitrarily without causing contradictions.

[0105] This invention can be used in devices for grounding shafts. (Symbol Explanation)

[0106] 100…Motor; 200…Battery; 300…Vehicle; 1…Motor section; 11…Rotor; 111…Rotor core; 1111…Rotor through hole; 112…Magnet; 12…Stator; 121…Stator core; 122…Coil section; 1221…Coil end; 2…Shaft; 201…First shaft through hole; 202…Second shaft through hole; 21…First shaft; 211…Hollow section; 212…Shaft cylinder section; 213…Inlet; 22…Cover section; 23…Second shaft; 3…Power transmission device; 31…Reduction device; 311…Main drive gear; 312…Intermediate driven gear; 313 …final stage drive gear; 314…intermediate shaft; 32…differential device; 321…gear ring; 4…housing; 401…motor storage space; 402…gear storage space; 41…first housing cylindrical part; 42…side plate part; 4201…side plate through hole; 4202…first output shaft through hole; 421, 422, 423, 424…bearing retaining part; 4211…bearing; 4221…bearing; 4231…first intermediate bearing; 4241…first output bearing; 43…motor cover part; 431…cover part; 4311…opening part; 4312…bearing retaining part; 4313…closed 4314…Bearing; 432…Cylinder; 433…Plate; 4331…Opening; 4332…Fixing; 4333…Rib; 4334…Wall; 434…Bearing Retainer; 4341…Bearing; 435…Sealing; 436…Second Recess; 44…Cover; 440…Reservoir; 4401…Lower Space; 441…First Cover; 4411…Plate; 442…Second Cover; 443…Through Hole; 444…Cylinder; 445…Filter; 446…Pipe; 447…First Recess; 45…Second Outer Shell; 46…Gear Cover; 460… Second output shaft through hole; 461, 462, 463… Bearing retainer; 4611… Bearing; 4621… Second intermediate bearing; 4631… Second output bearing; 464… Tray; 465… Oil passage; 6… Fluid circulation section; 61… Piping section; 62… Pump; 63… Cooler; 64… Storer; 7… Electrostatic removal device; 71… Conductive component; 72… Elastic component; 73… Retaining component; 74… Fixing component; F… Fluid; P… Fluid storage section; Ds… Output shaft; J1… First rotation axis; J2… Second rotation axis; J3… Third rotation axis.

Claims

1. A motor, comprising: A shaft that extends axially along the axis of rotation; A rotor that is supported on the shaft and is capable of rotating together with the shaft; The stator is positioned radially outward from the rotor; A housing that houses the rotor and the stator; and An anti-static device that electrically connects the shaft to the housing. The outer casing includes: The plate portion has an opening for insertion into one axial end of the shaft, and extends radially. A cover component is disposed on one axial end face of the plate body and covers the power removal device; A sealing component disposed at the opening between the shaft and the plate portion; A through hole, the through hole being disposed on at least one of the plate portion and the cover portion; and Filter, The static electricity removal device is housed within a storage space enclosed by the plate portion and the cover component. The storage space is connected to the outside through the through hole and the filter. The cover component has: A plate portion that extends in a direction intersecting the axis of rotation; and A first recess, which is recessed from the plate portion in the opposite axial direction. The filter covering the through hole is positioned axially opposite to the plate portion. At least one of the through holes is disposed in the first recess. The filter covering the through hole of the first recess is positioned axially opposite to the plate portion.

2. The motor according to claim 1, wherein, Viewed radially, at least a portion of the filter overlaps with the electrostatic removal device.

3. The motor according to claim 1, wherein, The through hole is located on the side that is more horizontal than the shaft. The contact portion between the shaft and the electrostatic removal device is located on the opposite side of the horizontal direction from the end of the shaft on one side of the horizontal direction.

4. The motor according to claim 1, wherein, The outer casing also has a second recess, which is disposed on one axial side of the plate portion and recessed in the other axial direction. At least a portion of the current-removing device is housed in the second recess.

5. The motor according to claim 1, wherein, The outer casing also has a cylindrical portion extending from the outer edge of the through hole. The filter is disposed in the cylindrical portion.

6. The motor as claimed in claim 5, wherein, The filter is disposed at the front end of the cylinder.

7. The motor according to claim 1, wherein, The through hole is positioned vertically above the contact portion between the shaft and the electrostatic discharge device.

8. The motor according to any one of claims 1 to 7, wherein, The storage space includes a lower space configured to be vertically below a predetermined width than the opening.

9. A motor, comprising: A shaft that extends axially along the axis of rotation; A rotor that is supported on the shaft and is capable of rotating together with the shaft; The stator is positioned radially outward from the rotor; A housing that houses the rotor and the stator; and An anti-static device that electrically connects the shaft to the housing. The outer casing includes: The plate portion has an opening for insertion into one axial end of the shaft, and extends radially. A cover component is disposed on one axial end face of the plate body and covers the power removal device; A sealing component disposed at the opening between the shaft and the plate portion; A through hole, the through hole being disposed on at least one of the plate portion and the cover portion; and Filter, The static electricity removal device is housed within a storage space enclosed by the plate portion and the cover component. The storage space is connected to the outside through the through hole and the filter. The cover component has a plate portion that extends in a direction intersecting the axis of rotation. The filter covering the through hole is positioned axially opposite to the plate portion. The through hole is located on the side that is more horizontal than the shaft. The contact portion between the shaft and the electrostatic removal device is located on the opposite side of the horizontal direction from the end of the shaft on one side of the horizontal direction.

10. The motor according to claim 9, wherein, The outer casing also has a second recess, which is disposed on one axial side of the plate portion and recessed in the other axial direction. At least a portion of the current-removing device is housed in the second recess.

11. The motor according to claim 9, wherein, The outer casing also has a cylindrical portion extending from the outer edge of the through hole. The filter is disposed in the cylindrical portion.

12. The motor as claimed in claim 11, wherein, The filter is disposed at the front end of the cylinder.

13. The motor according to claim 9, wherein, The through hole is positioned vertically above the contact portion between the shaft and the electrostatic discharge device.

14. The motor according to any one of claims 9 to 13, wherein, The storage space includes a lower space configured to be vertically below a predetermined width than the opening.

15. A motor, comprising: A shaft that extends axially along the axis of rotation; A rotor that is supported on the shaft and is capable of rotating together with the shaft; The stator is positioned radially outward from the rotor; A housing that houses the rotor and the stator; and An anti-static device that electrically connects the shaft to the housing. The outer casing includes: The plate portion has an opening for insertion into one axial end of the shaft, and extends radially. A cover component is disposed on one axial end face of the plate body and covers the power removal device; A sealing component disposed at the opening between the shaft and the plate portion; A through hole is disposed on at least one of the plate portion and the cover portion; Filter; as well as The second recess is disposed on one axial side of the plate body portion and recessed in the other axial direction. The static electricity removal device is housed within a storage space enclosed by the plate portion and the cover component. The storage space is connected to the outside through the through hole and the filter. At least a portion of the current-removing device is housed in the second recess. The second recess receives at least a portion of the filter.

16. The motor according to claim 15, wherein, The through hole is located on the side that is more horizontal than the shaft. The contact portion between the shaft and the electrostatic removal device is located on the opposite side of the horizontal direction from the end of the shaft on one side of the horizontal direction.

17. The motor according to claim 15, wherein, The outer casing also has a cylindrical portion extending from the outer edge of the through hole. The filter is disposed in the cylindrical portion.

18. The motor of claim 17, wherein, The filter is disposed at the front end of the cylinder.

19. The motor according to claim 15, wherein, The through hole is positioned vertically above the contact portion between the shaft and the electrostatic discharge device.

20. The motor according to any one of claims 15 to 19, wherein, The storage space includes a lower space configured to be vertically below a predetermined width than the opening.

21. A motor, comprising: A shaft that extends axially along the axis of rotation; A rotor that is supported on the shaft and is capable of rotating together with the shaft; The stator is positioned radially outward from the rotor; A housing that houses the rotor and the stator; and An anti-static device that electrically connects the shaft to the housing. The outer casing includes: The plate portion has an opening for insertion into one axial end of the shaft, and extends radially. A cover component is disposed on one axial end face of the plate body and covers the power removal device; A sealing component, disposed at the opening between the shaft and the plate portion; and A through hole is disposed on at least one of the plate body and the cover component. The static electricity removal device is housed within a storage space enclosed by the plate portion and the cover component. The storage space is connected to the outside through the through hole. The cover component has: A first cover portion, the first cover portion covering the electrostatic removal device; and The second cover is positioned radially outward from the first cover. The second cover is positioned on the opposite side of the axial direction compared to the first cover. When viewed from the axial direction, the through hole overlaps with the second cover portion.

22. The motor according to claim 21, wherein, The through hole is located on the side that is more horizontal than the shaft. The contact portion between the shaft and the electrostatic removal device is located on the opposite side of the horizontal direction from the end of the shaft on one side of the horizontal direction.

23. The motor according to claim 21, wherein, The housing also includes a filter. The storage space is connected to the outside via the through hole and the filter.

24. The motor according to claim 21, wherein, The outer casing also has a second recess, which is disposed on one axial side of the plate portion and recessed in the other axial direction. At least a portion of the current-removing device is housed in the second recess.

25. The motor according to claim 23, wherein, The outer casing also has a cylindrical portion extending from the outer edge of the through hole. The filter is disposed in the cylindrical portion.

26. The motor of claim 25, wherein, The filter is disposed at the front end of the cylinder.

27. The motor according to claim 21, wherein, The through hole is positioned vertically above the contact portion between the shaft and the electrostatic discharge device.

28. The motor according to any one of claims 21 to 27, wherein, The storage space includes a lower space configured to be vertically below a predetermined width than the opening.

29. A motor, comprising: A shaft that extends axially along the axis of rotation; A rotor that is supported on the shaft and is capable of rotating together with the shaft; The stator is positioned radially outward from the rotor; A housing that houses the rotor and the stator; and An anti-static device that electrically connects the shaft to the housing. The outer casing includes: The plate portion has an opening for insertion into one axial end of the shaft, and extends radially. A cover component is disposed on one axial end face of the plate body and covers the power removal device; A sealing component disposed at the opening between the shaft and the plate portion; A through hole, the through hole being disposed on at least one of the plate portion and the cover portion; and A wall portion, which, when viewed axially, is positioned between the shaft and the through hole. The static electricity removal device is housed within a storage space enclosed by the plate portion and the cover component. The storage space is connected to the outside through the through hole. The wall portion protrudes from one of the plate portion and the cover component toward the other, and extends in a direction perpendicular to the axial direction and intersecting the direction from one of the shaft and the through hole toward the other.

30. The motor according to claim 29, wherein, The housing also includes a filter. The storage space is connected to the outside via the through hole and the filter.

31. The motor according to claim 29, wherein, The outer casing also has a second recess, which is disposed on one axial side of the plate portion and recessed in the other axial direction. At least a portion of the current-removing device is housed in the second recess.

32. The motor according to claim 30, wherein, The outer casing also has a cylindrical portion extending from the outer edge of the through hole. The filter is disposed in the cylindrical portion.

33. The motor as claimed in claim 32, wherein, The filter is disposed at the front end of the cylinder.

34. The motor according to claim 29, wherein, The through hole is positioned vertically above the contact portion between the shaft and the electrostatic discharge device.

35. The motor according to any one of claims 29 to 34, wherein, The storage space includes a lower space configured to be vertically below a predetermined width than the opening.

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