Motor unit

Abstract

The motor unit includes: a housing; a stator housed in the housing; a rotor rotatably held inside the stator; a rotating shaft disposed at the rotor and rotatably supported by the housing; a cooling device that sprays a coolant to the stator; and a ventilation path having a breathing membrane that allows air to pass through and passing through from an inner wall surface to an outer wall surface of the housing; and further includes a prescribed electrical component disposed between a spray port of the cooling device and an inner wall surface side opening portion of the ventilation path.

Description

Technical Field

[0001] This invention relates to an electric motor unit. Background Technology

[0002] It is known that a breathable membrane made of synthetic resin such as PTFE is installed on a waterproof, box-shaped housing used in equipment such as electric motors or transmissions to mitigate the pressure difference between the inside and outside of the housing. Additionally, techniques for cooling components housed within the housing using coolant are also known.

[0003] However, when using coolant for cooling, if the coolant seeps into the breather membrane, the breather membrane's permeability decreases, resulting in a failure to mitigate pressure differences. JP2017-125536A discloses a structure that, in order to prevent coolant from adhering to the breather membrane, covers the opening of the passage communicating with the breather membrane with a cover formed from a component different from the housing.

[0004] However, in the structures described in the above documents, there is a problem of increased component quantity and cost due to the formation of a cover by other components, which in turn leads to the problem of unavoidably large shell size in order to ensure space for installing the cover. Summary of the Invention

[0005] Therefore, the object of the present invention is to suppress coolant seepage into the breathing membrane without causing the aforementioned problems.

[0006] An electric motor unit according to one aspect of the present invention comprises: a housing; a stator housed in the housing; a rotor rotatably held inside the stator; a rotating shaft disposed on the rotor and rotatably supported on the housing; a cooling device that sprays coolant onto the stator; and a ventilation passage having a breathing membrane that allows air to pass through and extending from the inner wall surface of the housing to the outer wall surface. Furthermore, it also comprises predetermined electrical components disposed between the spray nozzle of the cooling device and the opening on the inner wall surface of the ventilation passage. Attached Figure Description

[0007] Figure 1 This is an exploded perspective view of the motor unit according to the first embodiment.

[0008] Figure 2 It is a diagram used to illustrate the flow of coolant.

[0009] Figure 3 This is a cross-sectional view of the motor unit of the first embodiment viewed from a horizontal direction.

[0010] Figure 4 This is a diagram showing the motor unit of the first embodiment viewed from the direction of the rotation axis.

[0011] Figure 5This is a diagram showing the busbar unit as viewed from the stator side.

[0012] Figure 6 This is a diagram showing the motor unit of the first embodiment viewed from the direction of the rotation axis.

[0013] Figure 7 This is a diagram used to illustrate the structure of the ventilation path outside the casing.

[0014] Figure 8 This is a cross-sectional view of the motor unit of the second embodiment viewed from a horizontal direction. Detailed Implementation

[0015] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0016] (First Implementation)

[0017] Figure 1 This is an exploded perspective view of the motor unit 10 of this embodiment.

[0018] The electric motor unit 10 in this embodiment is used, for example, as a power source for an electric vehicle or a hybrid vehicle. The electric motor unit 10... Figure 1 The Z-axis direction is the upward direction in the usage state. In the following description, the direction along the X-axis will be defined as the left-right or horizontal direction, the direction along the Y-axis will be defined as the front-back or axial direction, and the direction along the Z-axis will be defined as the up-down direction.

[0019] like Figure 1 As shown, the motor unit 10 includes: a stator 2, a housing 1 housing the stator 2, a rotating shaft 4 rotatably supported on the housing 1, a rotor 3 fixedly supported on the rotating shaft 4, a cooling device 5 for spraying coolant toward the stator 2, and a venting passage 6 for adjusting the pressure inside the housing 1. Furthermore, the wall surface 1A with the venting passage 6 is shown exploded to illustrate one axial wall surface of the housing 1. Additionally, the busbar group 9 shown between wall surface 1A and the stator 2 is the electrical wiring for supplying power from the inverter (not shown) to the stator 2. For details regarding the busbar group 9, please refer to... Figures 3-5 This will be described later. Furthermore, the busbar group 9 in the undisassembled motor unit 10 is configured to extend from the outside of the housing 1 to the inside, but... Figure 1 The through hole through which the busbar group 9 passes in the housing 1 is omitted.

[0020] The stator 2 comprises: a stator core 2A made of laminated steel plates; coils (not shown) disposed in slots of the stator core 2A; and a stator support 2B that holds the stator core 2A from the outer periphery. In this specification, unless otherwise specified, the stator core 2A, the coils, and the stator support 2B are collectively referred to as the stator 2.

[0021] The stator support 2B has multiple bolt holes 7, through which the stator 2 is fixed to the housing 1 by bolts (not shown). Additionally, a protrusion 2C is provided on the outer periphery of the stator support 2B in this embodiment. This protrusion 2C protrudes radially from the front end to the rear end of the stator support 2B, but it is not necessarily required. The outer periphery of the stator support 2B is not limited to the shape shown in the figure; for example, it can be a cylindrical shape similar to the outer periphery of the stator 2.

[0022] The housing 1 is formed into a box shape with space for accommodating the electric motor consisting of a stator 2, a rotor 3, and a rotating shaft 4. A cooling device 5 (described later) and a ventilation passage 6 are provided on the housing 1. A coolant reservoir 1B is provided at the lower part of the housing 1. The coolant reservoir 1B can be integrally formed with the housing 1, or it can be a component formed as another part and mounted onto the housing 1. Furthermore, there are no particular limitations on the type of coolant used, but in this embodiment, oil is used as the coolant.

[0023] The rotating shaft 4 is rotatably supported on the housing 1 via bearings (not shown). The rotor 3 is fixedly supported on the rotating shaft 4 by pressing or other methods, and rotates integrally with the rotating shaft 4.

[0024] The cooling device 5 is mainly used to cool the coil ends of the stator 2 housed in the housing 1. In this embodiment, the cooling device 5 is arranged with the spray nozzle 5a facing the inside of the housing at approximately the center in both the left-right and front-back directions on the upper surface of the housing 1, and coolant is supplied from the spray nozzle 5a downwards in the vertical direction. The position approximately at the center in both the left-right and front-back directions on the upper surface of the housing 1 is referred to as the "apex".

[0025] Coolant is drawn from coolant reservoir 1B by an oil pump (not shown) and delivered to cooling unit 5 via coolant passage (not shown). The flow of coolant supplied from nozzle 5a will be described later.

[0026] Ventilation passage 6 is a pipe for ventilation that extends from the inner wall of housing 1 to the outer wall. Ventilation passage 6 functions to mitigate the pressure difference between the inside and outside of housing 1. More specifically, ventilation passage 6 is configured as a pressure regulating device, which includes a breathable membrane that allows air to pass through while preventing dust or liquid from passing through. When connected to ventilation passage 6, the breathable membrane (not shown) blocks the passage connecting the inside and outside of housing 1. Furthermore, the breathable membrane refers to a thin film formed from a synthetic resin (e.g., Polytetrafluoroethylene: PTFE). For details regarding the configuration of the breathable membrane, please refer to [reference needed]. Figure 7 To be described later.

[0027] Furthermore, the ventilation passage 6 is arranged on the housing 1 such that a specified electrical component is sandwiched between its inner wall side opening (hereinafter referred to as the inner wall side opening 6a) and the injection port 5a. The specified electrical component is not particularly limited, and can be any electrical wiring, connector, etc., used to supply power to the stator 2. In addition, the electrical component here includes not only the conductive electrical component itself, such as the electrical wiring, but also cover components such as resin covering the electrical component, housings that house the electrical component, or clamping components for arranging the electrical wiring.

[0028] In this embodiment, the busbar group 9 is configured as a defined electrical component. The busbar group 9 is a collective term for the flat busbars 9u, 9v, and 9w used to supply power to the stator coils of each phase (e.g., U phase, V phase, and W phase) of the stator 2. In this embodiment, the busbars 9u, 9v, and 9w are arranged horizontally in a manner orthogonal to the axial direction. As shown in the figure, the busbar group 9 in this embodiment is configured as busbar units 9 covered with resin to ensure insulation between the electrodes of the busbars 9u, 9v, and 9w.

[0029] Furthermore, the busbar group 9 is preferably arranged horizontally in such a way that the busbars 9u, 9v, and 9w do not overlap when viewed from the axial direction. This is because by arranging them horizontally, the horizontal width of the busbar group 9 is increased, thus improving its function as a barrier for coolant, as described later. However, the busbars 9u, 9v, and 9w may also have overlapping portions when viewed from the axial direction. Additionally, the busbars 9u, 9v, and 9w do not necessarily need to be arranged in the same axial position as shown in the figure; they can also be arranged staggered in the axial direction. For details regarding the busbar group 9 and its positional relationship with the inner wall side opening 6a, please refer to... Figures 3-5 To be described later.

[0030] Here, refer to Figure 2 The flow of coolant injected from the apex of housing 1 into the interior of housing 1 will be described.

[0031] Figure 2 This is a perspective view of the stator 2, rotor 3, and rotating shaft 4. The thick arrows in the figure indicate the flow of coolant. Additionally, P in the figure indicates the portion on the upper surface 2D of the stator 2 that receives the coolant.

[0032] Coolant is sprayed from the nozzle 5a of the cooling device 5 located at the apex of the housing 1 toward the stator 2 and collides (impacts) with the coolant-receiving part P of the stator 2. The coolant that collides with part P flows radially around the outer periphery of the stator 2, and a portion of it directly reaches the ends of the stator 2 in the front-rear direction to cool the coil ends that have become hot due to operation.

[0033] In addition, in this embodiment, the coolant that collides with the protrusion 2C before reaching each end of the stator 2 in the left and right directions is stored in the accumulation section divided by the wall surface on the P side of the protrusion 2C and the upper surface of the stator 2. Figure 3 The accumulation section shown by the dashed line is open at the front-rear end of the stator 2, so the coolant accumulated in the accumulation section flows along the protrusion 2C in the front-rear direction of the stator 2 to cool the end of the coil.

[0034] The coolant that cooled the coil ends was recycled to the coolant reservoir 1B located below the housing 1 (see reference). Figure 1 )middle.

[0035] In the prior art, when a portion of the coolant flow approaches the opening on the inner wall of the venting passage, it may scatter into droplets, for example, due to vibrations from a running electric motor unit or vehicle, and enter the venting passage 6. Additionally, coolant sprayed from the injection port 5a may also enter the venting passage 6 as droplets due to collisions with the stator 2. Furthermore, when coolant repeatedly enters the venting passage 6, it accumulates there, seeps into the breather membrane, and reduces its permeability, thus diminishing the pressure regulating function of the venting passage 6.

[0036] In contrast, in the motor unit 10 of this embodiment, the above-mentioned problem is solved by sandwiching an electrical component (busbar assembly 9) between the spray port 5a of the cooling device 5 and the inner wall side opening 6a of the ventilation passage 6. Hereinafter, refer to... Figure 3 , Figure 4 The positional relationship between the busbar group 9 and the inner wall side opening 6a in this embodiment will be explained.

[0037] Figure 3 From the horizontal direction ( Figure 1 (Observation along the X-axis) Figure 1 The diagram shows a cross-sectional view of the motor unit 10 according to this embodiment. (Using...) Figure 3 This diagram illustrates the axial positional relationship between busbar assembly 9, the inner wall side opening 6a, and the injection port 5a. The dashed arrows shown in the diagram represent a portion of the coolant flow (oil passage) injected into the housing 1.

[0038] Furthermore, the inverter housing 8 shown in the diagram is a housing that internally houses the inverter and is positioned above the housing 1. The busbar assembly 9 is configured to protrude from the inverter housing 8 into the interior of the housing 1, and electrically connects the inverter and the coils by connecting them to each phase of the stator 2 inside the housing 1, thereby supplying power to the stator 2. The wiring diagram between the busbar assembly 9 and the coils is omitted.

[0039] like Figure 3As shown, the injection port 5a is arranged on the upper surface of the housing 1 such that coolant is injected from the upper side of the housing 1 toward the interior of the housing 1. The inner wall side opening 6a of the vent passage 6 is arranged on the axial end face (wall 1A) of the front side of the housing 1. Furthermore, the busbar assembly 9 is arranged inside the housing 1 between the injection port 5a and the inner wall side opening 6a.

[0040] Thus, in the motor unit 10 of this embodiment, by interposing the busbar assembly 9 between the inner wall side opening 6a of the ventilation passage 6 and the injection port 5a, the busbar assembly 9 functions as a barrier against the flow of coolant. As a result, coolant entry into the ventilation passage 6 can be suppressed, and consequently, coolant seepage into the breathing membrane can be prevented.

[0041] Furthermore, the vertical position of the opening 6a on the inner wall side of the venting passage 6 is preferably positioned higher than the upper surface 2D of the stator 2. By positioning the opening 6a on the inner wall side of the stator 2 above the stator 2, the possibility of coolant flowing through the stator 2 intruding into the venting passage 6 can be further reduced.

[0042] Figure 4 From the axial direction ( Figure 1 The schematic structural diagram of the motor unit 10 of this embodiment (viewed from the Y-axis direction) illustrates the positional relationship between the inner wall side opening 6A and the busbar group 9 in the left-right direction.

[0043] As shown by the two double-headed arrows, the inner wall side opening 6a is preferably configured to be located at the center in the left-right direction when viewed from the axial direction of the busbar group 9. By configuring the inner wall side opening 6a and the busbar group 9 in this way, the possibility of coolant flowing around the busbar group 9 from the left-right direction and reaching the inner wall side opening 6a can be further reduced. Furthermore, "center" here includes a general central position that allows for slight left-right offset. Additionally, the position of the inner wall side opening 6a does not necessarily need to be in the center; it can be appropriately moved to a position that further reduces the possibility of coolant flowing around the busbar group 9 from the left-right direction and reaching the inner wall side opening 6a, depending on the coolant flow path.

[0044] By setting the positional relationship between the inner wall side opening 6a and the busbar assembly 9 in the left-right direction, the function of the busbar assembly 9 as a barrier to the flow of coolant can be further improved.

[0045] Next, refer to Figure 5 The method of bus group 9 in this embodiment will be described in detail.

[0046] Figure 5This is a schematic structural diagram of the busbar assembly 9 (busbar unit 9) as viewed from the stator 2 side, disposed in the housing 1. As described above, the busbar unit 9 is constructed by covering the busbars 9u, 9v, and 9w with resin. However, the busbars 9u, 9v, and 9w may also be configured such that at least a portion of the surface on the stator 2 side, i.e., the surface opposite to the flow of coolant, is exposed. Therefore, since the coolant is in contact with the exposed surfaces of the busbars 9u, 9v, and 9w, the busbars 9u, 9v, and 9w are cooled by the coolant, and the heat generation of the busbars 9u, 9v, and 9w can be suppressed.

[0047] However, the axial wall 1A of the housing 1 does not necessarily need to be composed of a single component; it can also be a structure composed of multiple components. For example, the wall 1A of the housing 1 can also have... Figure 6 The example shown is the cover component 1Aa.

[0048] Figure 6 This diagram illustrates the location of the ventilation passage 6 when the axial wall 1A of the housing 1 is composed of multiple components. The cover component 1Aa is formed in any shape and is configured to be detachable from the wall 1A via bolts or the like. When the cover component 1Aa is removed from the housing 1, a portion of the wall 1A corresponding to the shape of the cover component 1Aa is opened. This allows hands or tools to be inserted into the interior of the housing 1 through the opened portion, thus enabling easy maintenance or component replacement of the motor housed inside the housing 1 without removing the motor from the housing 1.

[0049] In this configuration of wall 1A, it is preferable that the vent passage 6 is provided on the cover member 1Aa. This allows for easy maintenance of the pressure regulating device, including the vent passage 6, by removing the cover member 1Aa from the housing 1. Furthermore, there are no particular limitations on the arrangement, shape, or number of cover members on wall 1A, as long as the inner wall-side opening 6a of the vent passage 6 on at least one cover member overlaps with the busbar assembly 9 when viewed from the axial direction.

[0050] Next, refer to Figure 7 The structure of the pressure regulating device, which includes the ventilation path 6, will be described. Figure 7 This is a diagram illustrating an example of the structure of the external ventilation passage 6 of the housing 1.

[0051] As shown in the figure, the external ventilation passage 6 of the housing 1 in this embodiment includes: a ventilation pipe 6b, a hose 6c, an adapter 6d, and a filter 6e.

[0052] The vent pipe 6b and hose 6c are tubes used to extend the vent passage 6 outside the housing 1. They are fixed to the wall surface 1A via a specified clamping member, with the front end on the opposite side to the vent passage 6 positioned higher than the vertical position of the vent passage 6. In this embodiment, the vent pipe 6b is made of metal, and the hose 6c is made of a material such as rubber; however, these materials can be appropriately selected considering durability, cost, etc. Furthermore, the vent pipe 6b and hose 6c do not necessarily have to be separate components; they can be integrally formed. Additionally, the hose 6c does not necessarily have the crank shape shown in the illustration; it can also be a straight line extending upwards from the vent passage 6.

[0053] The filter 6e is a PTFE (breathable membrane) covered by a general-purpose cover. In this embodiment, the filter 6e is connected to the front end of the rubber hose 6c via a flange-shaped adapter 6d. By configuring the filter 6e in this way, the breathable membrane is positioned above the ventilation passage 6, thus, even if coolant seeps in from the inner wall side opening 6a of the ventilation passage 6, coolant penetration into the breathable membrane can be more reliably suppressed. In addition, as shown in the figure, the flange-shaped portion of the adapter 6d is configured to extend horizontally near the lower part of the filter 6e, thereby preventing water from splashing onto the filter 6e, even in the event of splashing, such as rainwater from the road surface.

[0054] The above describes the detailed structure of the external ventilation passage 6 of the housing 1. In this embodiment, as shown in the figure, the pressure regulating device consists of the ventilation passage 6, the inner wall side opening 6a, the ventilation pipe 6b, the flexible hose 6c, the adapter 6d, and the filter 6e. However, the pressure regulating device does not necessarily have to be... Figure 7 The structure shown can be modified as long as it has at least a venting passage 6 and an opening 6a on the inner wall side, and has the function of mitigating the pressure difference between the inside and outside of the housing 1. For example, the pressure regulating device can also be configured such that the filter 6e is directly connected to the venting passage 6 outside the housing 1 without a hose 6c, etc. In addition, it is not necessary to use PTFE, and the filter 6e can be replaced, for example, by simply installing a cap on the front end of the hose 6c.

[0055] The effects of the motor unit 10 in this embodiment will be explained below.

[0056] The motor unit 10 of this embodiment includes: a housing 1, a stator 2 housed in the housing 1, a rotor 3 rotatably held inside the stator 2, a rotating shaft 4 disposed on the rotor 3 and rotatably supported on the housing, a cooling device 5 that sprays coolant toward the stator 2, a ventilation passage 6 having a breathing membrane that allows air to pass through and extending from the inner wall surface of the housing to the outer wall surface, and predetermined electrical components disposed between the spray nozzle of the cooling device and the inner wall surface opening (6a) of the ventilation passage. Thus, the electrical components disposed between the inner wall surface opening 6a of the ventilation passage 6 and the spray nozzle 5a can prevent coolant from entering the ventilation passage 6, thereby preventing coolant from seeping into the breathing membrane of the ventilation passage 6. Furthermore, since the electrical components are already present in the housing 1, there is no increase in the number of components or the cost.

[0057] Furthermore, in this embodiment, the injection port 5a is positioned on the upper surface of the housing 1 in its operating state, and the inner wall side opening 6a is positioned on the wall surface 1A orthogonal to the rotation axis 4 in the operating state of the housing 1. By arranging the injection port 5a in this way, the coil ends of the stator 2 can be cooled by the flow generated by the weight of the coolant. In addition, by arranging the inner wall side opening 6a on the wall surface 1A of the housing 1 orthogonal to the rotation axis 4, electrical components can be arranged between the inner wall side opening 6a and the injection port 5a without the need for significant layout changes as in the past.

[0058] Furthermore, in this embodiment, the inner wall side opening 6a is positioned higher than the upper surface 2D of the stator 2 in the vertical direction when the housing 1 is in use. This further reduces the possibility of coolant flowing through the stator 2 intruding into the ventilation passage 6.

[0059] Furthermore, in this embodiment, the inner wall side opening 6a is positioned opposite the center of the designated electrical component (busbar assembly 9) in the horizontal direction. This further reduces the possibility of coolant flowing into the busbar assembly 9 from the left or right and reaching the inner wall side opening 6a.

[0060] Furthermore, in this embodiment, the specified electrical component is a busbar (busbar group 9) used to supply power to the stator. The busbar group 9 is configured as a busbar unit 9 housing multiple buses corresponding to the number of phases of the stator 2, and the busbar unit 9 is configured such that at least a portion of the stator-side surface of the buses (9u, 9v, 9w) is exposed. Therefore, since the coolant is in contact with the exposed surfaces of the buses 9u, 9v, 9w, the buses 9u, 9v, 9w are cooled by the coolant, and the heat generation of the buses 9u, 9v, 9w can be suppressed.

[0061] (Second Implementation)

[0062] Figure 8 FromFigure 1 A cross-sectional view of the motor unit 20 of the second embodiment viewed along the X-axis.

[0063] and Figure 3 The difference between the motor unit 10 of the first embodiment shown is that, unlike the case in the first embodiment where the injection port 5a is disposed on the upper surface of the housing 1, the injection port 5a of this embodiment is disposed on the axial end face of the housing 1. Hereinafter, the description will focus on this difference.

[0064] like Figure 8 As shown, in this embodiment, the injection port 5a is disposed on the axial end face of the housing 1, configured to spray coolant toward any one or more of the stator 2, rotor 3, and rotating shaft 4. The locations where the sprayed coolant collides with the stator 2, rotor 3, and rotating shaft 4 are exemplified as locations P1, P2, and P3 (refer to the dashed elliptical frame). Furthermore, in this embodiment, the busbar assembly 9 is disposed between any one or more of locations P1, P2, and P3 and the inner wall side opening 6a. With this structure, the busbar assembly 9 can also function as a barrier to coolant flow, preventing coolant from entering the ventilation passage 6. As a result, coolant infiltration into the breather membrane can be prevented.

[0065] Furthermore, in this embodiment, the inner wall side opening 6a is positioned on the wall surface 1A of the housing 1 at a position higher than the injection port 5a. This further reduces the likelihood of coolant injected from the injection port 5a entering the inner wall side opening 6a.

[0066] The motor unit 20 according to this embodiment includes: a housing 1; a stator 2 housed in the housing 1; a rotor 3 rotatably held inside the stator 2; a rotating shaft 4 mounted on the rotor 3 and rotatably supported on the housing; a cooling device 5 that sprays coolant toward the stator 2; and a ventilation passage 6 having a breathing membrane that allows air to pass through and extending from the inner wall surface of the housing to the outer wall surface; furthermore, it includes a predetermined electrical component disposed between the location (parts P1, P2, P3) where the coolant sprayed from the cooling device (5) collides with the coolant and the inner wall surface opening (6a) of the ventilation passage (6). Thus, the electrical component disposed between the inner wall surface opening 6a of the ventilation passage 6 and the location (parts P1, P2, P3) where the coolant collides with the coolant can prevent coolant from entering the ventilation passage 6, thereby preventing coolant from seeping into the breathing membrane of the ventilation passage 6.

[0067] Furthermore, in this embodiment, the inner wall side opening 6a is positioned above the injection port 5a. This further reduces the likelihood of coolant injected from the injection port 5a entering the inner wall side opening 6a.

[0068] The embodiments of the present invention have been described above. However, the above embodiments are merely examples of the application of the present invention and are not intended to limit the technical scope of the present invention to the specific structures of the above embodiments.

[0069] For example, the layout shown in the attached figures is merely an example and is not limited to the layout illustrated. Appropriate modifications can be made based on the premise that the electrical components are disposed between the injection port 5a and the inner wall side opening 6a, or between any of the locations P1, P2, and P3 where the coolant injected from the injection port 5a collides with the motor and the inner wall side opening 6a. For example, considering the positional relationship between the housing 1 and the inverter housing 8, the inner wall side opening 6a can be positioned on the left-right side wall of the housing 1.

Claims

1. A motor unit, characterized in that, have: case; The stator is housed within the casing; The rotor, which rotates freely and remains inside the stator; A rotating shaft, which is disposed on the rotor and rotatably supported on the housing; A cooling device that sprays coolant into the stator; A ventilation passage having a breathing membrane that allows air to pass through and extending from the inner wall surface of the housing to the outer wall surface; The specified electrical components are disposed between the injection port of the cooling device and the opening on the inner wall side of the ventilation passage. The ventilation passage opens on the inner wall surface of one wall portion of the housing in the axial direction. The spray nozzle of the cooling device is positioned on the upper surface of the housing during its operating state, so that the sprayed coolant is radially dispersed and flows on the outer peripheral surface of the stator. The electrical components function as a barrier to prevent coolant from entering the ventilation path.

2. The motor unit as claimed in claim 1, wherein, The inner wall side opening is disposed on the wall surface of the housing that is orthogonal to the rotation axis when the housing is in use.

3. The motor unit as described in claim 1 or 2, wherein, The opening on the inner wall side is positioned higher than the upper surface of the stator in the vertical direction when the housing is in use.

4. The motor unit as described in claim 1 or 2, wherein, The inner wall side opening is positioned opposite the central portion of the specified electrical component in the horizontal direction.

5. The motor unit as described in claim 1 or 2, wherein, The specified electrical component is a busbar used to supply power to the stator.

6. The motor unit as described in claim 5, wherein, have: A busbar unit that houses multiple busbars corresponding to the number of phases of the stator. The busbar unit is configured such that at least a portion of the stator side surface of the busbar is exposed.

7. A motor unit, characterized in that, have: case; The stator is housed within the casing; The rotor, which rotates freely and remains inside the stator; A rotating shaft, which is disposed on the rotor and rotatably supported on the housing; A cooling device that sprays coolant onto any one of the stator, the rotor, and the rotating shaft; A ventilation passage having a breathing membrane that allows air to pass through and extending from the inner wall surface of the housing to the outer wall surface; The specified electrical components are positioned between the point of impact of the coolant sprayed from the cooling device and the opening on the inner wall side of the vent passage, and... The electrical components function as a barrier to prevent coolant from entering the ventilation path.

8. The motor unit as claimed in claim 7, wherein, The opening on the inner wall side is positioned above the spray nozzle of the cooling device when the housing is in use.

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