Motor

Abstract

To eliminate a pressure difference between the inside and the outside of a space in which a static eliminator for a shaft is accommodated.SOLUTION: A static eliminator 7 electrically connects a shaft 2 of a motor and a housing. A plate portion 433 of the housing extends radially with an opening 4331 through which the shaft 2 is inserted. A cover member 44 is arranged on the plate portion 433 to cover the static eliminator 7. A seal member 435 is arranged between the shaft 2 and the plate portion 433 at the opening 4331. The through holes 443 are arranged in the plate portion 433 and / or the cover member 44. The static eliminator 7 is housed in a housing space 440 surrounded by the plate portion 433 and the cover member 44. The housing space 440 is connected to the outside through the through hole 443.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a motor. [Background technology]

[0002] Conventionally, a technology for discharging current from the shaft of a rotating machine such as a motor using a discharge device has been known. For example, the discharge device has a contactor formed from a molded carbon body. The contactor is housed in a guide sleeve. The contactor establishes electrical contact with a rotor contact surface formed on the periphery of the shaft due to a load applied by a coil spring. The contactor also forms a conductive connection with a sleeve portion constituting a ground via the guide sleeve. (See, for example, JP 2019-531679 A.)

[0003] When the contactor is brought into contact with the periphery of the shaft, the contactor wears as the shaft rotates, generating wear particles, such as carbon, from the contactor. To prevent the wear particles from entering the interior of the housing of the rotating machine, it is necessary to seal the space between the shaft and the housing and to house the discharge device in a space separate from the interior of the housing. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2019-531679 Summary of the Invention [Problem to be solved by the invention]

[0005] If the discharge device is housed in an enclosed space to prevent wear particles from scattering, the internal pressure will change due to changes in temperature inside the space, etc. If a pressure difference occurs between the inside and outside of the space, there is a risk that the seal between the shaft and the housing cannot be maintained.

[0006] An object of the present invention is to eliminate the pressure difference between the inside and outside of a space in which a static eliminator is housed. [Means for solving the problem]

[0007] An exemplary motor of the present invention includes a shaft, a rotor, a stator, a housing, and a static eliminator. The shaft extends axially along a rotation axis. The rotor is supported by the shaft and is rotatable together with the shaft. The stator is disposed radially outward of the rotor. The housing accommodates the rotor and the stator. The static eliminator electrically connects the shaft and the housing. The housing includes a plate portion, a cover member, a seal member, and a through hole. The plate portion extends radially and has an opening through which one axial end of the shaft is inserted. The cover member is disposed on one axial end face of the plate portion and covers the static eliminator. The seal member is disposed between the shaft and the plate portion at the opening. The through hole is disposed in at least one of the plate portion and the cover member. The static eliminator is housed in an accommodation space surrounded by the plate portion and the cover member. The accommodation space is connected to the outside through the through hole. [Effects of the Invention]

[0008] According to the exemplary motor of the present invention, it is possible to eliminate the pressure difference between the inside and outside of the space in which the static eliminator is housed. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a conceptual diagram showing an example of the configuration of a motor. [Figure 2] FIG. 2 is an enlarged conceptual diagram showing an example of the configuration of the main parts of the motor. [Figure 3] FIG. 3 is a schematic diagram showing an example of a vehicle equipped with a motor. [Figure 4] FIG. 4 is a perspective view showing an example of the configuration of the cover member and its interior. [Figure 5] FIG. 5 is a cross-sectional view of the cover member and its interior as viewed from the axial direction. [Figure 6] FIG. 6 is a perspective view showing another example of the configuration of the cover member and its interior. [Figure 7] FIG. 7 is a conceptual diagram showing a first example of arrangement of the through-hole, the cylindrical portion, and the filter. [Figure 8] FIG. 8 is a conceptual diagram showing a second example of arrangement of the through-hole, the cylindrical portion, and the filter. [Figure 9] FIG. 9 is a conceptual diagram showing a third example of arrangement of the through-hole, the cylindrical portion, and the filter. [Figure 10] FIG. 10 is a conceptual diagram showing a fourth example of the arrangement of the through-hole, the cylindrical portion, and the filter. [Figure 11] FIG. 11 is a conceptual diagram showing a fifth example of arrangement of the through-hole, the cylindrical portion, and the filter. [Figure 12] FIG. 12 is a conceptual diagram showing a sixth example of the arrangement of the through-hole, the cylindrical portion, and the filter. [Figure 13] FIG. 13 is a conceptual diagram showing a seventh example of arrangement of the through-hole, the cylindrical portion, and the filter. [Figure 14] FIG. 14 is a conceptual diagram showing an eighth example of the arrangement of the through-hole, the cylindrical portion, and the filter. [Figure 15] FIG. 15 is a perspective view showing a configuration example of a cover member and its interior in a modified example. [Figure 16] FIG. 16 is an enlarged conceptual diagram showing an example of the configuration of a main part of a motor in a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0010] Exemplary embodiments will now be described with reference to the 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. As shown in FIG. 1, the motor unit 1 side is referred to as one axial direction D1, and the power transmission device 3 side is referred to as the other axial direction D2. A radial direction perpendicular to a predetermined axis is simply referred to as the "radial direction," and a circumferential direction centered on the predetermined axis is simply referred to as the "circumferential direction." Furthermore, in this specification, a "parallel direction" includes not only completely parallel directions but also approximately parallel directions. Furthermore, "extending along" a predetermined direction or plane includes not only extending in the exact predetermined direction, but also extending in a direction tilted at an angle of less than 45° relative to the exact direction.

[0012] <1. Embodiment> FIG. 1 is a conceptual diagram showing an example of the configuration of motor 100. FIG. 2 is a conceptual diagram showing an enlarged example of the configuration of the main parts of motor 100. FIG. 3 is a schematic diagram showing an example of a vehicle 300 equipped with motor 100. Note that FIGS. 1 and 2 are merely conceptual diagrams, and the arrangement and dimensions of each part may not necessarily be the same as those of the actual motor 100. FIG. 2 is an enlarged view of part II surrounded by a dashed line in FIG. 1. FIG. 3 also shows a conceptual illustration of vehicle 300.

[0013] In this embodiment, as shown in FIG. 3, the motor 100 is mounted on a vehicle 300 that uses at least a motor as a power source, such as a hybrid vehicle (HV), a plug-in hybrid vehicle (PHV), or an electric vehicle (EV). The motor 100 is used as a power source for the vehicle 300. The vehicle 300 has the motor 100 and a battery 200. The battery 200 stores power to be supplied to the motor 100. In the example of the vehicle 300, the motor 100 drives the left and right front wheels. It is sufficient that the motor 100 drives at least one of the wheels.

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

[0015] The motor 100 further includes a static eliminator 7. The static eliminator 7 electrically connects the shaft 2 and the housing 4. The static eliminator 7 is fixed to the housing 4 and contacts the shaft 2. As shown in FIG. 2 , the static eliminator 7 of this embodiment further includes a conductive member 71, an elastic member 72, a holding member 73, and a fixing member 74.

[0016] The conductive member 71 is formed using a conductive material. The tip of the conductive member 71 contacts the second shaft 23 of the shaft 2, which will be described later. In this embodiment, the conductive member 71 is brush-shaped, but is not limited to this example and may be a molded body. The conductive member 71 is preferably made of a material with good sliding properties, and more preferably of a material with a low coefficient of friction. The conductive member 71 may be made of, for example, a composite resin containing a conductive filler such as carbon fiber or metal.

[0017] The elastic member 72 is housed in a compressed state inside the holding member 73. Due to its elasticity, the elastic member 72 presses the conductive member 71 toward the second shaft 23. In this embodiment, a spring coil is used as the elastic member 72, but the elastic member 72 is not limited to this example and other types of members such as a leaf spring or rubber may also be used.

[0018] The holding member 73 is cylindrical with a bottom, and houses a portion of the conductive member 71 and the elastic member 72 inside. The holding member 73 holds the conductive member 71. Specifically, the holding member 73 holds the end of the conductive member 71 on the elastic member 72 side so that the end can move in the direction in which the holding member 73 extends. The holding member 73 also holds the elastic member 72 so that the elastic member 72 can expand and contract in the direction in which the holding member 73 extends.

[0019] The fixing members 74 fix the static eliminator 7 to the housing 4. In this embodiment, the fixing members 74 are attached to the holding member 73. At least one fixing member 74 is fixed to a plate portion 433 (described later) (see FIG. 4 (described later)). However, without being limited to this example, at least one fixing member 74 may be fixed to a cover member 44 (described later). In other words, the fixing members 74 fix the holding member 73 to at least one of the plate portion 433 and the cover member 44.

[0020] Furthermore, the fixing member 74 is conductive and is electrically connected to the conductive member 71. The fixing member 74 is fixed to the conductive plate portion 433 or the cover member 44, whereby the conductive member 71 is electrically connected to the housing 4.

[0021] <1-1. Motor section 1> Next, the motor unit 1 will be described with reference to Figures 1 and 2. The motor unit 1 is a DC brushless motor. The motor unit 1 is the driving source of the motor 100, and is driven by power from an inverter (not shown). The motor unit 1 is an inner rotor type in which a rotor 11 is rotatably disposed inside a stator 12. As shown in Figure 1, the motor unit 1 has a rotor 11 and a stator 12.

[0022] <1-1-1. Rotor 11> The rotor 11 is supported by the shaft 2. The motor 100 includes the rotor 11. The rotor 11 is rotatable together with the shaft 2. More specifically, the rotor 11 is supported by a first shaft 21, which will be described later. The rotor 11 rotates when power is supplied to the stator 12 from a power supply unit (not shown) of the motor 100. The rotor 11 has a rotor core 111 and a magnet 112. The rotor core 111 is formed, for example, by laminating thin electromagnetic steel sheets. The rotor core 111 is a cylindrical body extending along the axial direction, and is fixed to the radially outer surface of the first shaft 21. A plurality of magnets 112 are fixed to the rotor core 111. The plurality of magnets 112 are arranged circumferentially with their magnetic poles alternating.

[0023] The rotor core 111 also has a rotor through-hole 1111. The rotor through-hole 1111 passes through the rotor core 111 in the axial direction and is connected to the first shaft through-hole 201. The rotor through-hole 1111 is used as a flow path for a fluid F. In this embodiment, the fluid F is a lubricating liquid that lubricates the bearings of the motor 100, the power transmission device 3, and the like, and is, for example, oil such as ATF (automatic transmission fluid). The motor 100 is provided with the fluid F. The fluid F is also used as a refrigerant that cools the stator 12 and bearings 4211 and 4314, which will be 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 via the first shaft through hole 201. Furthermore, the fluid F that flows into the rotor through hole 1111 can flow out of the rotor core 111 from both axial ends of the rotor through hole 1111. The outflowing fluid F flies toward the stator 12 and cools, for example, the coil portion 122 (particularly the coil end 1221). The outflowing fluid F also flies toward the bearings 4211, 4314 that rotatably support the first shaft 21, and lubricates and cools the bearings 4211, 4314.

[0025] <1-1-2. Stator 12> The stator 12 is disposed radially outward from the rotor 11. The motor 100 is equipped with the stator 12. The stator 12 has a stator core 121 and a coil portion 122. The stator 12 is held in a first housing cylindrical portion 41, which will be described later. The stator core 121 has a plurality of magnetic pole teeth (not shown) extending radially inward from the inner circumferential surface of an annular yoke. The coil portion 122 is formed by winding a conducting wire around the magnetic pole teeth via an insulator (not shown). The coil portion 122 has coil ends 1221 protruding from the axial end face of the stator core 121.

[0026] <1-2. Shaft 2> 1 and 2, the shaft 2 is rotatably supported by the housing 4 via bearings 4211, 4221, 4314, and 4611, which will be described later. That is, the motor 100 includes bearings 4211, 4221, 4314, and 4611. The bearings 4211, 4221, 4314, and 4611 rotatably support the first shaft 21.

[0027] The shaft 2 includes the first shaft 21. As described above, the motor 100 includes the shaft 2. The first shaft 21 is cylindrical and extends in the axial direction. A refrigerant flows inside the first shaft 21. The motor 100 also includes this refrigerant. In this embodiment, the refrigerant is a fluid F. As the shaft 2 rotates, the refrigerant flowing inside the first shaft 21 can be supplied to the stator 12, bearings 4211, 4314, and the like through a first shaft through-hole 201, which will be described later. Therefore, the stator 12 (particularly the coil end 1221 of the coil portion 122), bearings 4211, 4314, and the like can be cooled by the refrigerant.

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

[0029] The first shaft 21 may be split at a midpoint in the axial direction. If the first shaft 21 is split, the split parts of the first shaft 21 are connected, for example, by spline fitting. Alternatively, a screw coupling using male and female threads may be used. They may also be joined by a fixing method such as press fitting or welding. When a fixing method such as press fitting or welding is used, serrations that combine recesses and protrusions extending in the axial direction may be used. This configuration makes it possible to reliably transmit rotation.

[0030] The shaft 2 further includes a lid portion 22, a second shaft 23, a first shaft through-hole 201, and a second shaft through-hole 202. The lid portion 22 is disposed at one axial end of the first shaft 21. The second shaft 23 extends from the lid portion 22 in one axial direction D1. The first shaft through-hole 201 penetrates the first shaft 21 in the radial direction. The second shaft through-hole 202 communicates with the interior of the first shaft 21 and the external space of the shaft 2. The second shaft through-hole 202 is disposed further in the axial direction D1 than the first shaft through-hole 201. The first shaft 21, the lid portion 22, and the second shaft 23 are electrically conductive and are made of metal in this embodiment. The second shaft 23 contacts the static eliminator 7.

[0031] <1-2-1. Second shaft 23> The second shaft 23 extends in the axial direction along the first rotation axis J1. The second shaft 23 is an example of the "shaft" in the present invention. The outer diameter of the second shaft 23 is smaller than the outer diameter of the first shaft 21. The static eliminator 7 is in contact with the second shaft 23. In this embodiment, the static eliminator 7 is in contact with the radial outer surface of the second shaft 23, but is not limited to this example and may be in contact with one axial end surface of the second shaft 23.

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

[0033] 1, the first shaft through-holes 201 may be disposed on one axial side D1 from one axial end of the rotor 11, or may be disposed on the other axial side D2 from the other axial end of the rotor 11. In other words, at least some of the first shaft through-holes 201 may be disposed in 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 lid portion 22 and the shaft tube portion 212. In this embodiment, the second shaft through-hole 202 is disposed in the lid portion 22 and penetrates the lid portion 22 in the axial direction (see, for example, FIG. 2 ). This makes it easier to draw air into the first shaft 21 than when the second shaft through-hole 202 is disposed in the first shaft 21. Furthermore, if there are multiple second shaft through-holes 202 functioning as air intake ports, the amount of air drawn into the first shaft 21 and the flow of the drawn air can be appropriately adjusted depending on the number and arrangement of the second shaft through-holes 202. However, without being limited to the above example, the second shaft through-hole 202 may be disposed in the first shaft 21 and penetrate the first shaft 21 in the radial direction.

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

[0036] <1-2-4. Lid part 22> In this embodiment, the lid portion 22 has a plate shape that spreads radially from the first rotation axis J1, as shown in Fig. 2. However, the shape of the lid portion 22 is not limited to this example, and may be a shape other than a plate shape, for example, a cone shape that spreads radially outward toward one axial direction D1 or the other axial direction D2.

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

[0038] <1-3-1. Reduction device 31> The reduction gear 31 is connected to the shaft 2. The reduction gear 31 has a function of reducing the rotational speed of the motor unit 1 and increasing the torque output from the motor unit 1 in accordance with a reduction ratio. The reduction gear 31 transmits the torque output from the motor unit 1 to the output shaft Ds. In other words, the power transmission device 3 is connected to the other axial side D2 of the shaft 2, which rotates about a first rotation axis J1 extending along 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. Torque output from the motor unit 1 is transmitted to a ring gear 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 peripheral surface of the shaft 2. The main drive gear 311 may be the same member as the shaft 2, or may be a separate member that is firmly fixed to the shaft 2. The main drive gear 311 rotates together with the shaft 2 about 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 so as to be rotatable about the second rotation axis J2. The intermediate driven gear 312 and the final drive gear 313 are disposed on the outer circumferential surface of the intermediate shaft 314. The intermediate driven gear 312 may be the same member as the intermediate shaft 314, or may be a separate member that is firmly fixed.

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

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

[0044] <1-3-2. Differential device 32> The differential 32 is attached to the output shaft Ds. The differential 32 has a ring gear 321. The ring gear 321 transmits the output torque of the motor unit 1 to the output shaft Ds. The output shaft Ds has axles Ds1 and Ds2 attached to the left and right sides of the differential 32, respectively. When the vehicle is turning, for example, the differential 32 transmits torque to the left and right axles Ds1 and Ds2 while absorbing the difference in rotational speed between the left and right axles.

[0045] The lower end of the ring gear 321 is disposed inside a fluid reservoir P (described later) in which the fluid F stored in the lower portion of the gear portion accommodating space 402 accumulates (see FIG. 1). Therefore, when the first gear 331 rotates, the gear teeth of the ring gear 321 scoop up the fluid F. The fluid F scooped up by the ring gear 321 lubricates or cools the gears and bearings of the power transmission device 3. In addition, a portion of the scooped up fluid F is stored in a receiver 464 (described later) and is also used to cool the motor portion 1 via the shaft 2.

[0046] <1-4. Housing 4> Next, the housing 4 will be described in detail with reference to FIGS. 1 and 2. The housing 4 includes a first housing cylindrical portion 41, a side plate portion 42, a motor lid portion 43, a cover member 44, a second housing cylindrical portion 45, and a gear lid portion 46. The first housing cylindrical portion 41, the side plate portion 42, the motor lid portion 43, the second housing cylindrical portion 45, and the gear lid portion 46 are formed, for example, using a conductive material, and in this embodiment, are formed using a metal material such as iron, aluminum, or an alloy thereof. Furthermore, to suppress galvanic corrosion at contact portions, these are preferably formed using the same material. However, this is not limiting, and these may be formed using materials other than metal, or at least some of these may be formed using different materials.

[0047] As described above, the housing 4 accommodates the rotor 11, stator 12, bearings 4211, 4314, etc. of the motor section 1. More specifically, the housing 4 has a motor accommodating space 401. The motor accommodating space 401 is a space surrounded by the first housing cylindrical section 41, the side plate section 42, and the motor lid section 43, and accommodates the rotor 11, stator 12, bearings 4211, 4314, etc.

[0048] The housing 4 also accommodates the power transmission device 3. More specifically, the housing 4 has a gear portion accommodating space 402. The gear portion accommodating space 402 is a space surrounded by the side plate portion 42, the second housing cylindrical portion 45, and the gear cover portion 46, and accommodates the reduction gear 31, the differential gear 32, etc.

[0049] A fluid reservoir P in which fluid F accumulates is disposed in the lower portion of the gear portion accommodating space 402. A portion of the differential gear 32 is immersed in the fluid reservoir P. The fluid F accumulated in the fluid reservoir P is scooped up by the operation of the differential gear 32 and supplied to the inside of the gear portion accommodating space 402. For example, when the ring gear 321 of the differential gear 32 rotates, the fluid F is scooped up by the tooth surface of the ring gear 321. A portion of the scooped-up fluid F is supplied to the gears and bearings of the reduction gear 31 and the differential gear 32 in the gear portion accommodating space 402 and used for lubrication. Another portion of the scooped-up fluid F is supplied to the inside of the shaft 2, and is supplied to the rotor 11 and stator 12 of the motor unit 1 and the bearings in the gear portion accommodating space 402 and used for cooling and lubrication.

[0050] <1-4-1. First housing cylindrical portion 41> The first housing cylindrical portion 41 has a cylindrical shape extending in the axial direction. The motor unit 1, a reservoir 64 (described later), and the like are arranged inside the first housing cylindrical portion 41. A stator core 121 is fixed to the inner surface of the first housing cylindrical portion 41.

[0051] <1-4-2. Side plate part 42> The side plate portion 42 extends in a direction perpendicular to the first rotation axis J1 and covers the other axial end of the first housing cylindrical portion 41. In this embodiment, the first housing cylindrical portion 41 and the side plate portion 42 are different parts of a single member. By forming the two integrally, the rigidity of these can be increased. However, this is not limiting, and the first housing cylindrical portion 41 and the side plate portion 42 may be separate members.

[0052] The side plate portion 42 has a side plate through-hole 4201 through which the shaft 2 is inserted, and a first output shaft through-hole 4202. The side plate through-hole 4201 and the first output shaft through-hole 4202 axially pass through the side plate portion 42. The first shaft 21 is inserted through the side plate through-hole 4201. One axle Ds1 of the output shaft Ds is inserted through 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 the gap between them. Note that a seal refers to the adhesion between different members to such an extent that, for example, fluid F inside the members does not leak to the outside, and that foreign matter such as water, dirt, and dust from the outside does not enter. The same applies hereinafter to a seal.

[0053] The side plate portion 42 further has bearing holders 421, 422, 423, and 424. The bearing holder 421 is disposed on one axial end surface of the side plate portion 42 in the motor accommodating space 401 and holds a bearing 4211. The bearing holders 422, 423, and 424 are disposed on the other axial end surface of the side plate portion 42 in the gear portion accommodating space 402 (described later). The bearing holder 422 is disposed along the outer edge of the other axial end of the side plate through-hole 4201 and holds the bearing 4211. The bearing holder 423 holds a first intermediate bearing 4231. The bearing holder 424 is disposed along the outer edge of the other axial end of the first output shaft through-hole 4202 and holds a first output bearing 4241.

[0054] <1-4-3. Motor cover 43> The motor lid 43 is attached to one axial end of the first housing tubular portion 41. The motor lid 43 can be fixed to the first housing tubular portion 41 by, for example, screws, but is not limited to this. Any method that can firmly fix the plate portion 433 to the first housing tubular portion 41, such as screwing or press-fitting, can be widely used. This allows the motor lid 43 to fit tightly to one axial end of the first housing tubular portion 41. Note that "fitting tightly" refers to having a seal that prevents fluid F from leaking out of the member and prevents foreign matter such as water, dirt, and dust from entering from outside. The same applies hereinafter to "fitting tightly."

[0055] 2, the motor lid portion 43 has a lid portion 431, a cylindrical portion 432, a plate portion 433, and a bearing holding portion 434. In other words, the housing 4 has the lid portion 431, the cylindrical portion 432, and the plate portion 433.

[0056] <1-4-3-1. Lid section 431> The lid portion 431 extends in a direction intersecting the first rotation axis J1 and covers one axial end of the first housing cylindrical portion 41. The lid portion 431 has an opening 4311 through which the shaft 2 is inserted. The opening 4311 axially penetrates the lid portion 431. The first shaft 21 is inserted into the opening 4311. The lid portion 431 further has a bearing holder 4312 and a seal member 4313. The bearing holder 4312 is disposed on the other axial end surface of the lid portion 431 in the motor accommodating space 401. The bearing holder 4312 is disposed along the outer edge of the other axial end of the opening 4311 and holds a bearing 4314. The seal member 4313 is disposed between the first shaft 21 and the lid portion 431 in the opening 4311 to seal the gap between them. By sealing the opening 4311 with the sealing member 4313, foreign matter such as abrasion powder generated by the static eliminator 7 can be prevented from entering the motor accommodating space 401 containing the stator 12 and other components through the opening 4311.

[0057] <1-4-3-2.Cylinder part 432> The cylindrical portion 432 is cylindrical and surrounds the first rotation axis J1, and extends from one axial end face of the lid portion 431 in one axial direction D1.

[0058] <1-4-3-3. Plate part 433> The plate portion 433 is conductive, extends in a direction intersecting the first rotation axis J1, and is attached to the other axial end of the cylindrical portion 432. As described above, the housing 4 has the 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 in the radial direction. In detail, the plate portion 433 is disposed on one axial direction D1 relative to the stator 12 and a bearing 4341, which will be described later. The opening 4331 is disposed in the plate portion 433. The opening 4331 penetrates the plate portion 433 in the axial direction. Furthermore, the static eliminator 7 is disposed at one axial end of the plate portion 433.

[0059] The plate portion 433 further includes a fixing portion 4332, a rib 4333, and a wall portion 4334. The fixing portion 4332 and the rib 4333 protrude from the plate portion 433 in one axial direction D1. A fixing member 74 of the static eliminator 7 is fixed to the fixing portion 4332. A plurality of ribs 4333 extend radially from each fixing portion 4332. An 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 a through hole 443 (described later) when viewed from the axial direction.

[0060] <1-4-3-4. Bearing holder 434> The bearing holder 434 is disposed along the outer edge of one axial end of the opening 4331 on the other axial end face of the plate portion 433 , and holds a bearing 4341 .

[0061] <1-4-3-5. Sealing member 435> The seal member 435 is disposed in the opening 4331 of the plate portion 433. The motor 100 includes an annular seal member 435. The seal member 435 is disposed in the opening 4331 between the second shaft 23 and the plate portion 433 to seal the gap between them. A radially inner end of the plate portion 433, which extends along the outer edge of the opening 4331, contacts the radially outer surface of the second shaft 23 of the shaft 2 via the seal member 435. A radially outer end of the seal member 435 contacts the inner circumferential surface of the opening 4331 facing radially inward. The radially inner end of the seal member 435 contacts the radially outer surface of the second shaft 23. Sealing the opening 4331 with the seal member 435 prevents wear powder generated by the static eliminator 7 disposed on one axial end face of the plate portion 433 from entering the other axial direction D2 side of the plate portion 433 through the opening 4331. This prevents wear debris from entering the housing 4 that houses the stator 12 and other components. For example, it also prevents wear debris from entering the hollow portion 211 of the first shaft 21 through the second shaft through-hole 202. This prevents wear debris from entering the motor accommodating space 401 along with the flow of the fluid F in the hollow portion 211.

[0062] <1-4-4. Cover member 44> The cover member 44 is disposed on one axial end surface of the plate portion 433. As described above, the housing 4 has the cover member 44. The cover member 44 covers the static eliminator 7. In other words, the static eliminator 7 is accommodated in an accommodating space 440 surrounded by the plate portion 433 and the cover member 44. 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 accommodated in the accommodating space 440. Therefore, the wear powder can be prevented from scattering outside the accommodating space 440.

[0063] The accommodation space 440 also includes a lower space 4401 of a predetermined size. The lower space 4401 is disposed vertically below the opening 4331 of the plate portion 433. This allows wear powder generated at the contact portion between the second shaft 23 of the shaft 2 and the static eliminator 7 to accumulate in the lower space 4401. By making the lower space 4401 sufficiently large, it is possible to prevent the wear powder accumulated at the bottom of the accommodation space 440 from overflowing between the second shaft 23 and the plate portion 433 at the opening 4331.

[0064] The cover member 44 can be attached to the plate portion 433 by, for example, but not limited to, screw fastening. In this embodiment, the cover member 44 forms a storage space 440 together with the plate portion 433. The storage space 440 is a space surrounded by the cover member 44 and the plate portion 433, and houses the opening 4331 and the static eliminator 7.

[0065] The cover member 44 has a first cover portion 441 and a second cover portion 442. The first cover portion 441 covers the static eliminator 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 on one axial direction D1 from the opening 4331 and the static eliminator 7. The first cover portion 441 has a plate portion 4411 extending in a direction intersecting the first rotation axis J1. The second cover portion 442 is disposed on the other axial direction D2 from the first cover portion 441. A radially inner end portion of the second cover portion 442 is connected to a radially outer end portion of the first cover portion 441, and a radially outer end portion of the second cover portion 442 is connected to one axial end face of the plate portion 433. The lower space 4401 is disposed between the plate portion 433 and the second cover portion 442. This allows the second cover portion 442 to be disposed on the other axial side D2 of the first cover portion 441, thereby saving space in the housing 4 in the axial direction. Also, part of the space between the plate portion 433 and the second cover portion 442 can be used as the lower space 4401 where wear powder accumulates.

[0066] <1-4-4-1. Through-hole 443, cylindrical portion 444, and filter 445> In this embodiment, the cover member 44 further includes a through-hole 443, a cylindrical portion 444, and a filter 445. Here, the through-hole 443, the cylindrical portion 444, and the filter 445 will be described with reference to FIGS. 2 and 4 to 14.

[0067] FIG. 4 is a perspective view showing an example of the configuration of the cover member 44 and its interior. FIG. 5 is a cross-sectional view of the cover member 44 and its interior as viewed from the axial direction. In FIG. 4, the cover member 44 is shown transparent to make it easier to see the arrangement of the second shaft 23, the static eliminator 7, and the like. FIG. 5 also shows a cross-sectional structure of the second shaft 23, the static eliminator 7, and the cover member 44 cut along an imaginary plane perpendicular to the axial direction. In FIGS. 4 and 5, 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 figure is vertically upward, and the direction from the top to the bottom of the figure is vertically downward. In FIGS. 4 and 5, the axial direction, the vertical direction Dv, and the horizontal direction Dh are perpendicular to each other.

[0068] 7 to 14 are conceptual diagrams showing first to eighth arrangement examples of the through-hole 443, the cylindrical portion 444, and the filter 445, respectively. Note that Figs. 7 to 14 are merely conceptual diagrams, and the arrangement and dimensions of each part may not necessarily be the same as those of the actual motor 100. Also, Figs. 7 to 14 each correspond to part II surrounded by a dashed line in Fig. 1.

[0069] The through hole 443 connects the storage space 440 with the outside. The housing 4 has the through hole 443. In this embodiment, the through hole 443 is disposed in the first cover portion 441 (see, for example, FIGS. 2 and 4 to 9). However, the arrangement of the through hole 443 is not limited to the example of this embodiment. The through hole 443 may also be disposed in the second cover portion 442 (see, for example, FIG. 10). Furthermore, the through hole 443 may also be disposed only in the plate portion 433 (see, for example, FIGS. 11 and 12), or may also be disposed in both the plate portion 433 and the cover member 44 (see, for example, FIG. 13). In other words, it is sufficient that the through hole 443 is disposed in at least one of the plate portion 433 and the cover member 44.

[0070] The accommodation space 440 that accommodates the static eliminator 7 is connected to the outside through the through-hole 443. Because the accommodation space 440 is connected to the outside through the through-hole 443, it is possible to prevent changes in the internal pressure of the accommodation space 440 due to temperature changes and the like. Therefore, it is possible to eliminate the pressure difference between the inside and outside of the accommodation space 440 that accommodates the static eliminator 7.

[0071] The accommodating space 440 is connected to the outside via the through-hole 443 and the filter 445. The housing 4 has the filter 445. This prevents abrasion powder of the conductive member 71 generated by the static eliminator inside the accommodating space 440 from being discharged to the outside of the accommodating space 440, while eliminating the pressure difference between the inside and outside of the accommodating space 440. It also prevents foreign matter from entering the inside of the accommodating space 440 from the outside.

[0072] In this embodiment, the through-hole 443 extends in the axial direction. However, the present invention is not limited to this example, and the through-hole 443 may extend in a direction other than the axial direction, for example, in the radial direction as shown in FIG.

[0073] 10 to 13, the through hole 443 may overlap the second cover portion 442 when viewed in the axial direction. Specifically, the through hole 443 may be disposed in the second cover portion 442 (see FIG. 10). The through hole 443 may also be disposed in the plate portion 433 and axially face the second cover portion 442 (see FIGS. 11 to 13). This allows the through hole 443 to be positioned further away from the contact portion between the second shaft 23 of the shaft 2 and the static eliminator 7 in the radial direction. This makes it difficult for wear powder generated at the contact portion to reach the through hole 443. This makes it difficult for the wear powder to be discharged to the outside of the accommodation space 440. Furthermore, when the accommodation space 440 is connected to the outside through a filter 445, clogging of the filter 445 by wear powder reaching the through hole 443 can be suppressed. However, these examples do not exclude a configuration in which the through-hole 443 is disposed in the plate portion 433 and faces the first cover portion 441 in the axial direction.

[0074] Preferably, the through hole 443 is disposed vertically above the contact portion between the second shaft 23 of the shaft 2 and the static eliminator 7 (see FIGS. 4 and 5). Wear powder generated at the contact portion tends to fall vertically downward due to gravity. Therefore, by disposing the through hole 443 vertically above the contact portion, it is possible to prevent the wear powder from being discharged to the outside of the accommodation space 440 through the through hole 443. Note that this example does not exclude a configuration in which the through hole 443 is not disposed vertically above the contact portion.

[0075] Furthermore, in this embodiment, when viewed from the vertical direction Dv, in a direction perpendicular to the axial direction and parallel to the horizontal direction Dh, the static eliminator 7 is disposed on the opposite side of the through hole 443, across the contact portion between the second shaft 23 of the shaft 2 and the static eliminator 7 (see FIGS. 4 and 5). Wear powder generated at the contact portion may move toward the through hole 443 on the air flow generated by the pressure difference between the inside and outside of the accommodation space 440. When viewed from the axial direction, by disposing the static eliminator 7 at a position away from between the through hole 443 and the contact portion, the static eliminator 7 can be less likely to be exposed to wear powder moving toward the through hole 443.

[0076] Note that this example does not exclude a configuration in which the static eliminator 7 is not disposed on the opposite side of the through hole 443 across the contact portion in a direction perpendicular to the axial direction and parallel to the horizontal direction Dh, as viewed from the vertical direction Dv. For example, as shown in FIG. 6 , the static eliminator 7 may be disposed closer to the through hole 443 than the contact portion. In this case, the static eliminator 7 may be disposed between the contact portion between the shaft 2 and the static eliminator 7 and the through hole 443, in a direction perpendicular to the axial direction and parallel to the horizontal direction Dh, as viewed from the vertical direction Dv. By disposing the static eliminator 7 between the contact portion and the through hole 443, the through hole 443 can be spaced far away from the contact portion while the static eliminator 7 is brought close to the through hole 443. Therefore, the through hole 443 and the static eliminator 7 can be disposed compactly, while preventing wear powder generated at the contact portion from moving toward the through hole 443.

[0077] Preferably, as in this embodiment, a wall portion 4334 is disposed between the second shaft 23 of the shaft 2 and the through hole 443 when viewed in the axial direction (see FIGS. 4 to 6 ). The housing 4 has the wall portion 4334. Specifically, the wall portion 4334 protrudes from the plate portion 433 in one axial direction D1. However, this is not limiting, and the wall portion 4334 may protrude from the cover member 44 in the other axial direction D2. That is, the wall portion 4334 protrudes from one of the plate portion 433 and the cover member 44 to the other. The wall portion 4334 extends perpendicular to the axial direction and in a direction intersecting the direction from one of the second shaft 23 of the shaft 2 and the through hole 443 to the other. By disposing the wall portion 4334 between the through hole 443 and the second shaft 23, wear powder generated at the contact portion between the second shaft 23 and the static eliminator 7 is less likely to move toward the through hole 443. Therefore, it becomes difficult for wear powder to be discharged to the outside of the accommodation space 440 through the through hole 443. Note that the example of this embodiment does not exclude a configuration in which 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 housing 4 has the cylindrical portion 444. The inside of the cylindrical portion 444 is connected to the through-hole 443.

[0079] In this embodiment, the cylindrical portion 444 is disposed in the first cover portion 441. Furthermore, the cylindrical portion 444 is disposed outside the accommodation space 440, and extends in one axial direction D1 from the outer edge of the through-hole 443 (see, for example, FIG. 7). However, the arrangement of the cylindrical portion 444 is not limited to this example.

[0080] For example, the cylindrical portion 444 may be disposed inside the accommodation space 440 and extend in the other axial direction D2 from the outer edge of the through-hole 443 disposed in the first cover portion 441 (see, for example, FIG. 8).

[0081] Furthermore, when the through hole 443 extends radially, the tubular portion 444 may extend radially outward from the outer edge of the through hole 443 arranged in the first cover portion 441 (see Figure 9), or may extend radially inward from the outer edge of the through hole 443.

[0082] The cylindrical portion 444 may also be disposed in the second cover portion 442. In this case, the cylindrical portion 444 may be disposed outside the accommodation space 440 and extend in one axial direction D1 from the outer edge of the through-hole 443 disposed in the second cover portion 442 (see, for example, FIG. 10).

[0083] Furthermore, the cylindrical portion 444 may be disposed in the plate portion 433. In this case, the cylindrical portion 444 may be disposed inside the accommodation space 440 and extend in one axial direction D1 from the outer edge of the through-hole 443 disposed in the plate portion 433 (see, for example, FIG. 11). Alternatively, the cylindrical portion 444 may be disposed outside the accommodation space 440 and extend in the other axial direction D2 from the outer edge of the through-hole 443 disposed in the plate portion 433 (see, for example, FIG. 12).

[0084] Furthermore, the cylindrical portion 444 may be disposed on both the plate portion 433 and the cover member 44 (see, for example, FIG. 13).

[0085] Next, in this embodiment, the filter 445 is disposed in the cylindrical portion 444. In this way, the filter 445 can be disposed more easily than when the filter 445 is disposed inside the through-hole 443.

[0086] Furthermore, in this embodiment, the filter 445 is disposed at the tip of the cylindrical portion 444. This makes it possible to more easily dispose the filter 445.

[0087] However, the arrangement of filter 445 is not limited to the above example. For example, filter 445 may be arranged inside through-hole 443. Filter 445 may also be attached to one end of tubular member 446, such as a flexible hose or pipe, the other end of which is connected to the tip of tubular portion 444 (see FIG. 14).

[0088] <1-4-5. Second housing cylindrical portion 45> The second housing cylindrical portion 45 has a cylindrical shape that extends in the axial direction. The power transmission device 3 is disposed inside the second housing cylindrical portion 45. One axial end of the second housing cylindrical portion 45 is connected to and covered by the side plate portion 42.

[0089] <1-4-6. Gear cover part 46> The gear lid portion 46 extends in a direction intersecting the first rotation axis J1 and is detachably attached to one axial end of the second housing tubular portion 45. In this embodiment, the second housing tubular portion 45 and the gear lid portion 46 are different parts of a single member. However, this is not limited to this example, and the second housing tubular portion 45 and the gear lid portion 46 may be separate members. Furthermore, the gear lid portion 46 can be attached to the second housing tubular portion 45 by, for example, fastening with a screw, but is not limited thereto, and any method that can firmly fasten the gear lid portion 46 to the second housing tubular portion 45, such as screwing or press-fitting, can be widely used. This allows the gear lid portion 46 to be in close contact with one axial end of the second housing tubular 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 coincides with the third rotation axis J3. The output shaft Ds is inserted through 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] The gear lid portion 46 further has bearing holders 461, 462, and 463. The bearing holders 461, 462, and 463 are arranged on the other axial end surface of the gear lid portion 46 in the gear portion accommodating space 402. The bearing holder 461 holds a bearing 4611. The bearing holder 462 holds a second intermediate bearing 4621. The bearing holder 463 is arranged along the outer edge of the other axial end of the second output shaft through-hole 460, and holds a second output bearing 4631.

[0092] The gear lid portion 46 also has a tray portion 464 and an oil passage 465. The tray portion 464 is disposed on one axial end surface of the gear lid portion 46, and has a recess that is recessed vertically downward. The tray portion 464 can store the fluid F scooped up by the ring gear 321. The oil passage 465 is a passage for the fluid F, and connects the tray portion 464 and 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, a description will be given of the fluid circulation unit 6. The fluid circulation unit 6 has a piping unit 61, a pump 62, a cooler 63, and a reservoir 64.

[0094] The piping section 61 connects the pump 62 to a reservoir 64 disposed inside the first housing cylindrical section 41 and supplies the fluid F to the reservoir 64. The pump 62 sucks the fluid F stored in the lower region of the gear portion accommodating space 402. The pump 62 is an electric pump, but is not limited to this. For example, the pump 62 may be configured to be driven by using part of the power of the shaft 2 of the motor 100.

[0095] The cooler 63 is disposed between the pump 62 and the reservoir 64 of the piping unit 61. That is, the fluid F sucked by the pump 62 passes through the cooler 63 via the piping unit 61 and is then sent to the reservoir 64. A refrigerant such as water supplied from the outside is supplied to the cooler 63. The cooler 63 exchanges heat between the refrigerant and the fluid F to lower the temperature of the fluid F.

[0096] The reservoir 64 is a tray located vertically above the stator 12 inside the motor accommodating space 401. A drip hole is formed in the bottom of the reservoir 64, and fluid F is dripped from the drip hole 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. Modifications of the embodiment> Next, a modified example of the embodiment will be described with reference to Figures 15 and 16. The following describes the modified example with configurations that differ from the above-described embodiment. Furthermore, the same components as those in the above-described embodiment will be assigned the same reference numerals, and their description may be omitted.

[0098] FIG. 15 is a perspective view showing an example of the configuration of the cover member 44 and its interior in a modified example. FIG. 16 is a conceptual diagram showing an enlarged view of an example of the configuration of the main parts of the motor 100 in a modified example. In FIG. 15, the cover member 44 is shown transparent to make the arrangement of the second shaft 23, the static eliminator 7, and other components more easily visible. In FIG. 15, 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 drawing is vertically upward, and the direction from the top to the bottom of the drawing is vertically downward. In FIG. 15, the axial direction, the vertical direction Dv, and the horizontal direction Dh are perpendicular to one another. In addition, FIG. 16 shows a cross-sectional structure of the main parts of the motor 100 taken along an imaginary plane that includes the dashed-dotted line XVI-XVI in FIG. 15 and the first rotation axis J1 and is parallel to the axial direction.

[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 toward the other axial direction D2. That is, in the present embodiment, the first recess 447 is disposed in the first cover portion 441. However, this is not limiting, and the first recess 447 may be disposed in the second cover portion 442. At least one through hole 443 is disposed in the first recess 447. In the present embodiment, the through hole 443 is disposed in a bottom surface of the first recess 447 facing the one axial direction D1. At least a portion of the filter 445 covering this 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 closer to the other axial direction D2 than the plate portion 4411. In this way, the filter 445 covering the through hole 443 of the first recess 447 can be disposed closer to the other axial direction D2. Therefore, the arrangement of the filter 445 can prevent the axial size of the motor 100 from increasing.

[0100] Furthermore, when viewed from the radial direction, at least a portion of the filter 445 overlaps with the static eliminator 7. That is, the axial position of at least a portion of the filter 445 is the same as that of the static eliminator 7. This allows the filter 445 and the plate portion 4411 to be disposed further toward the other axial direction D2, thereby further reducing the axial size of the motor 100.

[0101] The motor cover portion 43 further has a second recess 436. In other words, the housing 4 has the second recess 436. The second recess 436 is arranged on one axial direction D1 side of the plate portion 433 and is recessed toward the other axial direction D2. At least a portion of the static eliminator 7 is housed in the second recess 436. By arranging at least a portion of the static eliminator 7 in the second recess 436 arranged on one axial direction D1 side of the plate portion 433, the static eliminator 7 can be arranged closer to the other axial direction D2. This reduces the axial size of the motor 100, making it more compact.

[0102] The second recess 436 also accommodates at least a part of the filter 445. This allows the static eliminator 7 to be disposed closer to the other axial direction D2. This reduces the axial size of the motor 100, making it possible to make it more compact.

[0103] 15 and 16, the static eliminator 7 is disposed between the second shaft 23 and the through-hole 443 and the filter 445. More specifically, when viewed from the vertical direction Dv, in a direction perpendicular to the axial direction and parallel to the horizontal direction Dh, the static eliminator 7 is disposed between the contact portion of the shaft 2 and the static eliminator 7 and the through-hole 443. However, these arrangements are not limited to the examples shown in FIGS. 15 and 16. For example, the static eliminator 7 may be disposed on the opposite side of the through-hole 443 and the filter 445 across the contact portion of the second shaft 23 and the static eliminator 7 of the shaft 2 (see, for example, FIGS. 4 and 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 above-described embodiments. The present invention can be implemented by adding various modifications to the above-described embodiments without departing from the spirit of the invention. Furthermore, the matters described in the above-described embodiments can be combined in any appropriate manner as long as no contradiction occurs. [Industrial Applicability]

[0105] The present invention is useful in devices for grounding shafts. [Explanation of symbols]

[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, 2 2 Cover portion, 23 Second shaft, 3 Power transmission device, 31 Reduction gear, 311 Main drive gear, 312 Intermediate driven gear, 313 Final drive gear, 314 Intermediate shaft, 32 Differential device, 321 Ring gear, 4 Housing, 401 Motor accommodating space, 402 Gear portion accommodating space, 41 First housing cylindrical portion, 42 Side plate portion, 4201 Side plate through hole, 4202 First output shaft through hole, 421 , 422, 423, 424... bearing holder, 4211... bearing, 4221... bearing, 4231... first intermediate bearing, 4241... first output bearing, 43... motor cover, 431... cover, 4311... opening, 4312... bearing holder, 4313... seal member, 4314... bearing, 432... cylinder portion, 433... plate portion, 4331... opening, 4332... fixing portion, 4333... rib, 4334... wall portion, 4 34... bearing holder, 4341... bearing, 435... seal member, 436... second recess, 44... cover member, 440... accommodation space, 4401... lower space, 441... first cover portion, 4411... plate portion, 442... second cover portion, 443... through hole, 444... cylindrical portion, 445... filter, 446... pipe member, 447... first recess, 45... second housing cylindrical portion, 46... gear cover portion, 460... second output shaft through hole, 461, 462,463...bearing holder, 4611...bearing, 4621...second intermediate bearing, 4631...second output bearing, 464...receiver, 465...oil passage, 6...fluid circulation section, 47...adhesive member, 61...piping section, 62...pump, 63...cooler, 64...reservoir, 7...static eliminator, 71...conductive member, 72...elastic member, 73...holding member, 74...fixing member, F...fluid, P...fluid storage section, Ds...output shaft, J1...first rotating shaft, J2...second rotating shaft, J3...third rotating shaft

Claims

1. a shaft extending axially along a rotation axis; a rotor supported by the shaft and rotatable together with the shaft; a stator disposed radially outward of the rotor; a housing that accommodates the rotor and the stator; a static eliminator that electrically connects the shaft and the housing; Equipped with The housing includes: a plate portion extending in a radial direction and having an opening through which one axial end portion of the shaft is inserted; a cover member disposed on one axial end surface of the plate portion to cover the static eliminator; a seal member disposed between the shaft and the plate portion at the opening; a through hole disposed in at least one of the plate portion and the cover member; A filter, Equipped with the static eliminator is accommodated in an accommodation space surrounded by the plate portion and the cover member, the accommodation space is connected to the outside through the through-hole and the filter; The cover member is a plate portion extending in a direction intersecting the rotation axis; a first recess recessed from the plate portion in the other axial direction; and the filter covering the through hole is disposed on the other side of the plate portion in the axial direction, At least one of the through holes is disposed in the first recess; The filter covering the through hole of the first recess is disposed on the other side of the plate portion in the axial direction.

2. A shaft extending axially along a rotation axis; a rotor supported by the shaft and rotatable together with the shaft; a stator disposed radially outward of the rotor; a housing that accommodates the rotor and the stator; a static eliminator that electrically connects the shaft and the housing; Equipped with The housing includes: a plate portion extending in a radial direction and having an opening through which one axial end portion of the shaft is inserted; a cover member disposed on one axial end surface of the plate portion to cover the static eliminator; a seal member disposed between the shaft and the plate portion at the opening; a through hole disposed in at least one of the plate portion and the cover member; A filter, Equipped with the static eliminator is accommodated in an accommodation space surrounded by the plate portion and the cover member, the accommodation space is connected to the outside through the through-hole and the filter; the cover member has a plate portion extending in a direction intersecting the rotation axis, The filter covering the through hole is disposed on the other side of the plate portion in the axial direction. the through hole is provided on one side of the shaft in the horizontal direction, A motor, wherein a contact portion between the shaft and the static eliminator is provided on the other horizontal side of one end of the shaft in the horizontal direction.

3. a shaft extending axially along a rotation axis; a rotor supported by the shaft and rotatable together with the shaft; a stator disposed radially outward of the rotor; a housing that accommodates the rotor and the stator; a static eliminator that electrically connects the shaft and the housing; Equipped with The housing includes: a plate portion extending in a radial direction and having an opening through which one axial end portion of the shaft is inserted; a cover member disposed on one axial end surface of the plate portion to cover the static eliminator; a seal member disposed between the shaft and the plate portion at the opening; a through hole disposed in at least one of the plate portion and the cover member; A filter, a second recessed portion disposed on one axial side of the plate portion and recessed in the other axial direction; Equipped with the static eliminator is accommodated in an accommodation space surrounded by the plate portion and the cover member, the accommodation space is connected to the outside through the through-hole and the filter; At least a portion of the static eliminator is accommodated in the second recess, The second recess accommodates at least a portion of the filter.

4. a shaft extending axially along a rotation axis; a rotor supported by the shaft and rotatable together with the shaft; a stator disposed radially outward of the rotor; a housing that accommodates the rotor and the stator; a static eliminator that electrically connects the shaft and the housing; Equipped with The housing includes: a plate portion extending in a radial direction and having an opening through which one axial end portion of the shaft is inserted; a cover member disposed on one axial end surface of the plate portion to cover the static eliminator; a seal member disposed between the shaft and the plate portion at the opening; a through hole disposed in at least one of the plate portion and the cover member; Equipped with the static eliminator is accommodated in an accommodation space surrounded by the plate portion and the cover member, The accommodation space is connected to the outside through the through hole, The cover member is a first cover portion that covers the static eliminator; a second cover portion disposed radially outward from the first cover portion; and the second cover portion is disposed on the other side of the axial direction than the first cover portion, The through hole overlaps with the second cover portion when viewed in the axial direction.

5. a shaft extending axially along a rotation axis; a rotor supported by the shaft and rotatable together with the shaft; a stator disposed radially outward of the rotor; a housing that accommodates the rotor and the stator; a static eliminator that electrically connects the shaft and the housing; Equipped with The housing includes: a plate portion extending in a radial direction and having an opening through which one axial end portion of the shaft is inserted; a cover member disposed on one axial end surface of the plate portion to cover the static eliminator; a seal member disposed between the shaft and the plate portion at the opening; a through hole disposed in at least one of the plate portion and the cover member; a wall portion disposed between the shaft and the through hole as viewed in the axial direction; Equipped with the static eliminator is accommodated in an accommodation space surrounded by the plate portion and the cover member, The accommodation space is connected to the outside through the through hole, A motor, wherein the wall portion protrudes from one of the plate portion and the cover member to 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 to the other.

6. The motor according to claim 1 , wherein at least a portion of the filter overlaps with the static eliminator when viewed in a radial direction.

7. the through hole is provided on one side of the shaft in the horizontal direction, 7. The motor according to claim 1, wherein a contact portion between the shaft and the static eliminator is provided on the other horizontal side of one end of the shaft in the horizontal direction.

8. the housing further comprises a filter; The motor according to claim 4 or 5, wherein the housing space is connected to the outside via the through-hole and the filter.

9. the housing further includes a second recess disposed on one axial side of the plate portion and recessed in the other axial direction, 9. The motor according to claim 1, wherein at least a portion of the static eliminator is housed in the second recess.

10. the housing further includes a cylindrical portion extending from an outer edge of the through hole; The motor according to claim 1 , wherein the filter is disposed in the cylindrical portion.

11. The motor according to claim 10 , wherein the filter is disposed at a tip end of the cylindrical portion.

12. The motor according to claim 1 , wherein the through hole is disposed vertically above a contact portion between the shaft and the static eliminator.

13. The motor according to claim 1 , wherein the accommodation space includes a lower space of a predetermined size that is disposed vertically below the opening.

Images