motor unit
By introducing multiple jet flow channels in the motor unit, the refrigerant is directly injected to the stator coil end, solving the problem of low cooling efficiency in the prior art and achieving the effects of high-efficiency cooling and size optimization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- TOYOTA JIDOSHA KK
- Filing Date
- 2026-01-21
- Publication Date
- 2026-07-31
AI Technical Summary
Existing motor units have low cooling efficiency, especially the heat at the stator coil end is difficult to dissipate effectively.
By introducing multiple jet flow channels in the motor unit, the refrigerant is directly injected to the stator coil end, forming multiple jet flow channels to cool the stator coil end. By connecting the flow channels with the housing flow channels and the stator flow channels, all-round cooling is achieved.
This improves the cooling efficiency of the motor unit, especially the heat at the stator coil end, which can be directly and effectively cooled, reducing the impact on magnetic properties and helping to reduce the overall size of the motor unit.
Smart Images
Figure CN122495772A_ABST
Abstract
Description
Technical Field
[0001] The technology disclosed in this specification relates to a motor unit. Background Technology
[0002] Japanese Unexamined Patent Application Publication No. 2022-118472 (JP 2022-118472 A) discloses a motor unit including a housing and a stator core, the stator core being an annular body housed within the housing and extending along an axial direction. Summary of the Invention
[0003] The motor unit in JP 2022-118472 A also includes cooling pipes extending in the axial direction. The cooling pipes are positioned above the stator core. The motor is cooled by refrigerant flowing through the cooling pipes.
[0004] This specification provides a novel and effective technique for cooling motor units.
[0005] In a first aspect of this technology, a motor unit may include: a housing; a stator core, the stator core being an annular body, the stator core being housed within the housing and extending in an axial direction; and a first connecting member disposed between a first end surface and a first surface of the housing facing the first end surface, the first end surface being located at one end of the stator core in the axial direction. The housing may include a first housing flow channel having a first housing opening on a first surface. The first housing flow channel may be a flow channel for refrigerant. The stator core may include a stator flow channel extending from a first stator opening on a first end surface to a second stator opening on a second end surface, the second end surface being located at the other end of the stator core in the axial direction. The first connecting member may include a first connecting flow channel providing communication between the first housing opening of the first housing flow channel and the first stator opening of the stator flow channel.
[0006] In the above configuration, refrigerant flows through the first housing flow channel, the first connecting flow channel, and the stator flow channel. This allows for the cooling of the motor unit.
[0007] As a second aspect, in the first aspect, the motor unit may further include a stator coil disposed at the stator core. The stator coil may include a first coil end protruding from a first end surface of the stator core. The first connecting member may include at least one first jet flow channel branching off from the first connecting flow channel, through which refrigerant is supplied toward the first coil end.
[0008] The first coil end tends to generate heat easily. In the above configuration, the refrigerant injected from the first jet flow channel is directed towards the first coil end. Therefore, the first coil end can be directly cooled.
[0009] As a third aspect, in the first or second aspect, the at least one first jet flow channel may include a plurality of first jet flow channels that are different from each other in the direction of injecting refrigerant.
[0010] In the above structure, various parts on the first coil end can be directly cooled.
[0011] As a fourth aspect, in the third aspect, refrigerant can be injected into multiple locations on the first coil end that are different from each other in terms of axial direction through multiple first jet flow channels.
[0012] In the above structure, various parts on the first coil end can be directly cooled.
[0013] As a fifth aspect, in any of the second to fourth aspects, the stator flow channel can be located at the upper part of the stator core.
[0014] In the above configuration, the refrigerant injected from the first jet flow channel is more likely to come into contact with the first coil end. Therefore, the first coil end can be reliably cooled.
[0015] As a sixth aspect, in any of the first to fifth aspects, the motor unit may further include a second connecting member disposed between the second end surface and a second surface of the housing facing the second end surface. The housing may further include a second housing flow channel having a third housing opening on the second surface. The second connecting member may include a second connecting flow channel providing communication between the third housing opening of the second housing flow channel and a second stator opening of the stator flow channel.
[0016] In the above configuration, refrigerant flows through the first housing flow channel, the first connecting flow channel, the stator flow channel, the second connecting flow channel, and the second housing flow channel. This allows for the cooling of the motor unit.
[0017] As a seventh aspect, in the sixth aspect, the motor unit may further include a stator coil disposed at the stator core. The stator coil may include a second coil end protruding from a second end surface of the stator core. The second connecting member may include at least one second jet flow channel branching off from the second connecting flow channel, through which refrigerant is injected toward the second coil end.
[0018] The second coil end tends to generate heat easily. In the above configuration, the refrigerant injected from the second jet flow channel is directed towards the second coil end. Therefore, the second coil end can be directly cooled.
[0019] As an eighth aspect, in any of the first to seventh aspects, the stator core may include a main body having a cylindrical shape and a protrusion projecting radially outward from the outer peripheral surface of the main body. The protrusion may be provided with a stator flow channel.
[0020] The above structure can reduce the impact on the magnetic properties of the stator core.
[0021] As a ninth aspect, in the eighth aspect mentioned above, the protrusion may also be provided with a fixing hole, by means of which the stator core is fixed to the housing.
[0022] In the above configuration, compared to a configuration where the fixing hole and stator flow channel are located at different protrusions, the stator core can be easily formed.
[0023] As a tenth aspect, in the ninth aspect, the diameter of the stator flow channel can be smaller than the diameter of the fixing hole.
[0024] In the above structure, the size of the protrusion can be reduced. Attached Figure Description
[0025] The features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, wherein like symbols denote like elements, and wherein: Figure 1 This is a schematic diagram of drive device 2; Figure 2 This is a diagram of the stator core 46 as viewed from one side in the axial direction; Figure 3 This is a diagram showing the fixing part between the stator core 46 and the first housing 30; Figure 4 This is a perspective view showing the first connecting member 24, the second connecting member 26, and the stator core 46; Figure 5 This is an enlarged view of the first connecting member 24; and Figure 6 This is a schematic diagram of the drive unit 202. Detailed Implementation
[0026] Reference Figures 1 to 5 Describes drive unit 2. Drive unit 2 is equipped in electric vehicles, etc. In this specification, the rotation axis A of motor 22 is defined by having an axial direction D1, a radial direction D2, and a circumferential direction D3 (see [reference]). Figure 2A cylindrical coordinate system is used. The axial direction D1 is parallel to the rotation axis A of the motor 22, and the coordinate axes are defined on the rotation axis. The radial direction D2 is perpendicular to the axial direction D1 and is defined as a coordinate axis with its origin on the rotation axis A. Furthermore, Figure 2 The circumferential direction D3 is perpendicular to both the axial direction D1 and the radial direction D2, and is defined as a coordinate axis surrounding the rotation axis A. Furthermore, in the state where the electric vehicle is equipped with the drive unit 2, the vertical direction is... Figure 1 The vertical direction is roughly the same. However, in an electric vehicle equipped with drive unit 2, the left and right directions may differ. Figure 1 The left and right directions in the text. However, in the following text, for ease of understanding, it will sometimes be based on... Figure 1 The description of the accompanying drawings will be performed using the left-right direction. Furthermore, in the following text, Figure 1 The left side is referred to as "the side in the axial direction D1", and Figure 1 The right side is referred to as "the other side in the axial direction D1". In addition, one side in the axial direction D1 and the other side in the axial direction D1 are referred to as "one side in the axial direction" and "the other side in the axial direction", respectively.
[0027] like Figure 1 As shown, the drive unit 2 includes a motor unit 10, a gear unit (not shown), an oil pump 12, and an oil cooler 14. The gear unit is located on the opposite side of the motor unit 10 in the axial direction.
[0028] The motor unit 10 includes a housing 20, a motor 22, a first connecting member 24, and a second connecting member 26.
[0029] The housing 20 includes a first housing 30 and a second housing 32. The first housing 30 has an opening on the other side in the axial direction. The second housing 32 is connected to the end of the first housing 30 on the other side in the axial direction.
[0030] The first housing 30 includes a supply flow channel 34. The supply flow channel 34 extends along the axial direction D1 between a first housing opening 34A on the outer surface 30A of the first housing 30 and a second housing opening 34B on the inner surface 30B of the first housing 30. The outer surface 30A is the surface of the first housing 30 on one side in the axial direction. The inner surface 30B is the surface of the first housing 30 on the other side in the axial direction.
[0031] The second housing 32 includes a flow collection channel 36. The flow collection channel 36 extends along the axial direction D1 between a third housing opening 36A on a surface 32A on one side of the second housing 32 in the axial direction and a fourth housing opening 36B on a surface 32B on the other side of the second housing 32 in the axial direction. The first housing opening 34A, the second housing opening 34B, the third housing opening 36A, and the fourth housing opening 36B are located at the upper part of the housing 20.
[0032] Motor 22, first connecting member 24, and second connecting member 26 are housed in housing 20. Motor 22 includes shaft 40, rotor 42, and stator 44. Shaft 40 extends along axis of rotation A. Axis of rotation A is the center of rotation of shaft 40. Shaft 40 is rotatably supported in housing 20 by bearings. Rotor 42 is fixed to shaft 40.
[0033] The stator 44 includes the stator core 46 and the stator coil 48. For example... Figure 4 As shown, the stator core 46 is an annular body extending along the axial direction D1. The stator core 46 is composed of multiple magnetic steel plates stacked along the axial direction D1. Figure 1 As shown, the stator core 46 has a first end surface 46A on one side in the axial direction and a second end surface 46B on the other side in the axial direction. Figure 2 As shown, the stator core 46 includes a cylindrical body portion 50 and three protrusions 52, 54, and 56 projecting radially outward from the outer peripheral surface of the body portion 50. The protrusions 52, 54, and 56 are arranged at regular intervals in the circumferential direction D3. Protrusion 52 is located on the upper part of the stator core 46. The protrusions 52, 54, and 56 include fixing holes 52A, 54A, and 56A. Figure 3 As shown, fixing holes 52A, 54A, and 56A are through holes extending along the axial direction D1. Fixing holes 52A, 54A, and 56A are holes through which the stator core 46 is fixed to the housing 20 by fastening member 58. Figure 2 The protrusion 52 also includes a stator flow channel 52B. For example... Figure 1 As shown, the stator flow channel 52B extends along the axial direction D1 from the first stator opening 46C on the first end surface 46A to the second stator opening 46D on the second end surface 46B. Figure 2 As shown, the diameter of the stator flow channel 52B is smaller than the diameter of the fixing holes 52A, 54A, and 56A.
[0034] Figure 1 The stator coil 48 is wound on the stator core 46. The stator coil 48 includes a first coil end 48A and a second coil end 48B. The first coil end 48A protrudes from the first end surface 46A of the stator core 46 in the axial direction. The second coil end 48B protrudes from the second end surface 46B of the stator core 46 in the axial direction.
[0035] like Figure 5 As shown, a first connecting member 24 is disposed between the first end surface 46A of the stator core 46 and the inner surface 30B of the first housing 30 facing the first end surface 46A. The first connecting member 24 is disposed above the first coil end 48A of the stator core 46. The first connecting member 24 includes a first main body portion 60A, a pair of first insertion portions 62A and 64A, a first connecting flow channel 66A, and a plurality of first jet flow channels 68A and 70A. The first main body portion 60A includes a right main body portion 72A and a left main body portion 74A. The right main body portion 72A has a cylindrical shape extending along the axial direction D1. The diameter of the right main body portion 72A is larger than the diameter of the stator flow channel 52B. The end surface of the right main body portion 72A on the other side of the axial direction abuts against the first end surface 46A of the stator core 46. The left main body portion 74A extends from the end of the right main body portion 72A on one side of the axial direction towards the other side. The upper half of the left main body portion 74A has a semi-cylindrical shape, and the lower half of the left main body portion 74A has an inclined external shape so as to extend close to the central axis of the first main body portion 60A while extending from the other side in the axial direction to one side in the axial direction. The shape of the end of the left main body portion 74A on the other side in the axial direction is the same as the shape of the end of the right main body portion 72A on one side in the axial direction. When viewed along the axial direction D1, the external shape of the end of the left main body portion 74A on one side in the axial direction is larger than the external shape of the supply flow channel 34 of the first housing 30. The end surface of the left main body portion 74A on one side in the axial direction abuts against the inner surface 30B of the first housing 30.
[0036] Each of the first insertion portions 62A and 64A has a cylindrical shape extending along the axial direction D1. The first insertion portion 62A extends from the end of the first main body portion 60A on the other side of the axial direction. The first insertion portion 62A is inserted into the stator flow channel 52B of the stator core 46. The diameter of the first insertion portion 62A is approximately the same as the diameter of the stator flow channel 52B. The outer surface of the first insertion portion 62A abuts against the wall surface of the stator core 46 that defines the stator flow channel 52B. The first insertion portion 64A extends from the end of the right main body portion 72A on one side of the axial direction. The first insertion portion 64A is inserted into the supply flow channel 34 of the first housing 30. The diameter of the first insertion portion 64A is approximately the same as the diameter of the supply flow channel 34. The outer surface of the first insertion portion 64A abuts against the wall surface of the first housing 30 that defines the supply flow channel 34.
[0037] The first connecting flow channel 66A extends along the axial direction D1 at the central portion of the first connecting member 24. The first connecting flow channel 66A extends from the end surface of the first insertion portion 62A on the other side in the axial direction to the end surface of the first insertion portion 64A on one side in the axial direction. That is, the first connecting flow channel 66A passes through the first connecting member 24 in the axial direction D1. The diameter of the first connecting flow channel 66A is smaller than the diameter of the stator flow channel 52B and the diameter of the supply flow channel 34. The first connecting member 24 provides communication between the second housing opening 34B of the supply flow channel 34 and the first stator opening 46C of the stator flow channel 52B.
[0038] The first jet flow channels 68A and 70A branch off from the first connecting flow channel 66A. The first jet flow channel 68A branches off from the first connecting flow channel 66A at the right main body portion 72A. The first jet flow channel 68A extends in the radial direction D2 (i.e., in the vertical direction). The first jet flow channel 70A branches off from the first connecting flow channel 66A at the left main body portion 74A. The first jet flow channel 70A extends in a direction inclined relative to the vertical direction. The first jet flow channels 68A and 70A are configured such that the extension of the central axis of the respective flow channel passes through the first coil end 48A. In this way, the first jet flow channels 68A and 70A are different from each other in the direction of oil flow. Specifically, the oil injected from the first jet flow channel 68A and the oil injected from the first jet flow channel 70A move toward portions on the first coil end 48A that are different from each other in the axial direction D1.
[0039] like Figure 1As shown, the second connecting member 26 is disposed between the second end surface 46B of the stator core 46 and the surface 32A of the second housing 32 on the axial direction side facing the second end surface 46B. The second connecting member 26 is disposed above the second coil end 48B of the stator core 46. The second connecting member 26 and the first connecting member 24 are bilaterally symmetrical. The second main body 60B, a pair of second insertion parts 62B, 64B, the second connecting flow channel 66B, the second jet flow channel 68B, 70B, the left main body 72B, and the right main body 74B correspond to the first main body 60A, the first insertion parts 62A, 64A, the first connecting flow channel 66A, the first jet flow channel 68A, 70A, the right main body 72A, and the left main body 74A, respectively. The end surface on the axial direction side of the left main body 72B abuts against the second end surface 46B of the stator core 46. The end surface of the right main body 74B on the other side in the axial direction abuts against the surface 32A of the second housing 32 on one side in the axial direction. The outer surface of the second insertion part 62B abuts against the wall surface of the stator core 46 that defines the stator flow channel 52B. The outer surface of the second insertion part 64B abuts against the wall surface of the second housing 32 that defines the collection flow channel 36. The second connecting member 26 provides communication between the third housing opening 36A of the collection flow channel 36 and the second stator opening 46D of the stator flow channel 52B. Oil injected from the second jet flow channel 68B and oil injected from the second jet flow channel 70B move toward portions on the second coil end 48B that are different from each other relative to the axial direction D1.
[0040] An external flow channel 80 is connected to a first housing opening 34A of a first housing 30. An oil pump 12 and an oil cooler 14 are provided in the external flow channel 80. The external flow channel 80 provides communication between the first housing opening 34A and an oil storage section (not shown).
[0041] The flow of oil through the drive unit 2 will be described. Driven by the oil pump 12, the oil stored in the oil storage section is drawn into the external flow channel 80. The oil drawn into the external flow channel 80 passes through the oil cooler 14, whereby it is cooled. The oil cooled by the oil cooler 14 passes through the supply flow channel 34 of the first housing 30 and is supplied to the first connection flow channel 66A of the first connecting member 24. Some of the oil supplied to the first connection flow channel 66A is sprayed from the first jet flow channels 68A and 70A toward the first coil end 48A. Thus, the first coil end 48A is directly cooled. Furthermore, the remaining portion of the oil supplied to the first connection flow channel 66A passes through the stator flow channel 52B and is supplied to the second connection flow channel 66B of the second connecting member 26. The stator core 46 is cooled by the oil passing through the stator flow channel 52B. Some of the oil supplied to the second connection flow channel 66B is sprayed from the second jet flow channels 68B and 70B toward the second coil end 48B. Thus, the second coil end 48B is directly cooled. In addition, the remainder of the oil supplied to the second connecting flow channel 66B passes through the collection flow channel 36 of the second housing 32 and is supplied to the gear unit and other devices.
[0042] In this embodiment, oil cooled by the oil cooler 14 is supplied to the motor unit 10 before the gear unit and other devices. That is, the motor unit 10 is positioned upstream of the gear unit and other devices in the oil flow path. In this configuration, the motor unit 10 can be further cooled compared to a configuration where the motor unit 10 is positioned downstream of the gear unit and other devices.
[0043] As described above, the motor unit 10 includes a housing 20, a stator core 46, and a first connecting member 24. The stator core 46 is an annular body, housed within the housing 20, and extends along an axial direction D1. The first connecting member 24 is disposed between a first end surface 46A positioned at one end of the stator core 46 in the axial direction D1 and an inner surface 30B of the first housing 30 facing the first end surface 46A (an example of "first surface of the housing"). The housing 20 includes a supply flow channel 34 for oil (an example of "refrigerant") having a second housing opening 34B on the inner surface 30B (an example of "first housing flow channel"). The stator core 46 includes a stator flow channel 52B extending from a first stator opening 46C (an example of "first opening") on the first end surface 46A to a second stator opening 46D (an example of "second opening") on the second end surface 46B. The first connecting member 24 includes a first connecting flow channel 66A, which provides communication between the second housing opening 34B of the supply flow channel 34 and the first stator opening 46C of the stator flow channel 52B.
[0044] In the above configuration, oil flows through the supply flow channel 34, the first connecting flow channel 66A, and the stator flow channel 52B. This allows for the cooling of the motor unit 10.
[0045] The motor unit 10 also includes a stator coil 48 disposed at the stator core 46. The stator coil 48 includes a first coil end 48A protruding from a first end surface 46A of the stator core 46. The first connecting member 24 includes first jet flow channels 68A and 70A, which branch from the first connecting flow channel 66A, and oil is supplied to the first coil end 48A through the first jet flow channels 68A and 70A.
[0046] The first coil end 48A tends to generate heat easily. In the above configuration, the oil injected from the first jet flow channels 68A and 70A is sprayed toward the first coil end 48A. Therefore, the first coil end 48A can be directly cooled.
[0047] The first jet flow channels 68A and 70A are different from each other in the direction of oil injection.
[0048] In the above configuration, each part on the first coil end 48A can be directly cooled.
[0049] Oil is sprayed through the first jet flow channels 68A and 70A toward the parts of the first coil end 48A that are different from each other relative to the axial direction D1.
[0050] In the above configuration, each part on the first coil end 48A can be directly cooled.
[0051] The stator flow channel 52B is located on the upper part of the stator core 46.
[0052] In the above configuration, the oil injected from the first jet flow channels 68A and 70A is more likely to come into contact with the first coil end 48A. Therefore, the first coil end 48A can be reliably cooled.
[0053] The motor unit 10 also includes a second connecting member 26 disposed between the second end surface 46B and a surface 32A of the second housing 32 located on the axial side and facing the second end surface 46B ("Example of the second surface of the housing"). The housing 20 also includes a collection flow channel 36 ("Example of the second housing flow channel") having a third housing opening 36A on the surface 32A of the second housing 32 located on the axial side. The second connecting member 26 includes a second connecting flow channel 66B providing communication between the third housing opening 36A of the collection flow channel 36 and the second stator opening 46D of the stator flow channel 52B.
[0054] In the above configuration, oil flows through the supply flow channel 34, the first connecting flow channel 66A, the stator flow channel 52B, the second connecting flow channel 66B, and the collection flow channel 36. This allows for the cooling of the motor unit 10.
[0055] The motor unit 10 also includes a stator coil 48 disposed at the stator core 46. The stator coil 48 includes a second coil end 48B protruding from the second end surface 46B of the stator core 46. The second connecting member 26 includes second jet flow channels 68B and 70B, which branch from the second connecting flow channel 66B and through which oil is sprayed toward the second coil end 48B.
[0056] The second coil end 48B tends to generate heat easily. In the above configuration, the oil injected from the second jet flow channels 68B and 70B is directed towards the second coil end 48B. Therefore, the second coil end 48B can be directly cooled.
[0057] The stator core 46 includes a cylindrical body portion 50 and a protrusion 52 that protrudes radially outward from the outer peripheral surface of the body portion 50. The protrusion 52 is provided with a stator flow channel 52B.
[0058] In the above structure, the impact on the magnetic properties of the stator core 46 can be reduced.
[0059] The protrusion 52 is also provided with a fixing hole 52A, and the stator core 46 is fixed to the housing 20 by means of the fixing hole 52A.
[0060] In the above configuration, compared to a configuration where the fixing hole 52A and the stator flow channel 52B are located at different protrusions, the stator core 46 can be easily formed.
[0061] The diameter of the stator flow channel 52B is smaller than the diameter of the fixing hole 52A.
[0062] In the above structure, the size of the protrusion 52 can be reduced.
[0063] As described above, in this embodiment, oil flows within the stator core 46. Therefore, it is unnecessary to provide, for example, a cooling pipe for oil flow on the outer side of the stator core 46 in the radial direction D2. In this configuration, the drive unit 2 can be reduced in size compared to a configuration including the aforementioned cooling pipe. Furthermore, in the case of a configuration including the aforementioned cooling pipe, the length of the cooling pipe, etc., needs to be adjusted according to the length of the stator 44 in the axial direction D1, etc. In this embodiment, the first connecting member 24 and the second connecting member 26 can be used together in different types of drive units.
[0064] Specific examples of the techniques disclosed in this specification have been described in detail above. These are merely examples and do not limit the scope of the claims. The techniques disclosed in the claims include various variations and modifications of the specific examples described above.
[0065] First variant
[0066] The drive unit may not include one of the connecting members, the first connecting member 24 and the second connecting member 26. (Refer to...) Figure 6 The description does not include the drive device 202 of the second connecting member. Components common to the embodiments are indicated by the same reference numerals, and their descriptions are omitted.
[0067] like Figure 6 As shown, the second housing 232 includes a protrusion 234 projecting in the axial direction and a collection flow channel 236. The collection flow channel 236 extends along the axial direction D1 between a third housing opening 236A (on the surface 234A of the protrusion 234 on the axial direction side of the second housing 232) and a fourth housing opening 236B (on the surface 232B of the second housing 232 on the other axial direction side). The surface 234A of the protrusion 234 on the axial direction side abuts against the second end surface 46B of the stator core 46. The collection flow channel 236 is in direct communication with the stator flow channel 52B of the stator core 46. In this variant, the second housing 232 may include one or more jet flow channels branching from the collection flow channel 236. Oil injected from the one or more jet flow channels moves toward the second coil end 48B.
[0068] In the absence of a drive unit excluding the first connecting member, the supply flow channel 34 of the first housing 30 can be directly connected to the stator flow channel 52B of the stator core 46. In this variant, the second connecting member 26 is an example of the "first connecting member".
[0069] Second variant
[0070] The supply flow channel 34, the collection flow channel 36, and the stator flow channel 52B do not need to extend along the axial direction D1. As an example, a height difference can be provided between the supply flow channel 34, the collection flow channel 36, and the stator flow channel 52B.
[0071] Third variant
[0072] In this embodiment, oil flows from one side of the axial direction to the other side through the stator flow channel 52B. Oil can also flow from the other side of the axial direction to one side of the axial direction through the stator flow channel 52B. In this variant, the collection flow channel is the flow channel of the first housing 30, and the supply flow channel is the flow channel of the second housing 32.
[0073] Fourth variant
[0074] The jet flow channel may be included in only one of the first connecting member 24 and the second connecting member 26. Alternatively, neither the first connecting member 24 nor the second connecting member 26 may include a jet flow channel.
[0075] Fifth variant
[0076] The first connecting member 24 may include one first jet flow channel, or may include three or more first jet flow channels. Furthermore, the second connecting member 26 may include one second jet flow channel, or may include three or more second jet flow channels.
[0077] Sixth variant
[0078] The direction of oil injection can be the same between the first jet flow channels 68A and 70A. Furthermore, the direction of oil injection can be the same between the second jet flow channels 68B and 70B.
[0079] Seventh variant
[0080] The first jet flow channels 68A and 70A can spray oil toward the same location on the first coil end 48A relative to the axial direction D1. Furthermore, the second jet flow channels 68B and 70B can spray oil toward the same location on the second coil end 48B relative to the axial direction D1.
[0081] Eighth variant
[0082] The second connecting member 26 and the first connecting member 24 can be asymmetrical on both sides.
[0083] Ninth variant
[0084] The stator core 46 may not include a protrusion. In this variant, a stator flow channel 52B is provided at the main body portion 50 of the stator core 46. In this variant, the stator 44 is fixed to the housing 20 by press fitting or the like.
[0085] Tenth variant
[0086] The fixing hole 52A and the stator flow channel 52B can be located at different protrusions.
[0087] Eleventh Variation
[0088] The diameter of the stator flow channel 52B can be the same as or larger than the diameter of the fixing hole 52A.
[0089] Twelfth Variation
[0090] The first connecting member 24 may not include the first insertion portions 62A and 64A. In this variant, the diameter of the first connecting flow channel 66A may be the same as the diameter of the supply flow channel 34 and the stator flow channel 52B. In this variant, the motor unit 10 may include positioning portions for positioning the first connecting flow channel 66A and the supply flow channel 34, and positioning portions for positioning the first connecting flow channel 66A and the stator flow channel 52B. As an example, each positioning portion consists of a protrusion and a corresponding recess. This also applies to the second connecting member 26.
[0091] Each technical element described in this specification or drawings, individually or in various combinations, possesses technical usefulness, and is not limited to the combinations described in the claims at the time of filing. Furthermore, the technology shown in this specification or drawings can achieve multiple objectives simultaneously, and is technically useful by achieving only one of those objectives.
Claims
1. A motor unit characterized by include: case; The stator core is an annular body that is housed in the housing and extends in the axial direction; as well as A first connecting member is disposed between a first end surface and a first surface of the housing facing the first end surface, the first end surface being located at one end of the stator core in the axial direction, wherein: The housing includes a first housing flow channel having a first housing opening on the first surface, the first housing flow channel being a flow channel for refrigerant. The stator core includes a stator flow channel extending from a first stator opening on a first end surface to a second stator opening on a second end surface, the second end surface being located at the other end of the stator core in the axial direction; and The first connecting member includes a first connecting flow channel, which provides communication between the first housing opening of the first housing flow channel and the first stator opening of the stator flow channel.
2. The motor unit of claim 1, wherein It also includes a stator coil disposed at the stator core, wherein: The stator coil includes a first coil end protruding from the first end surface of the stator core; and The first connecting member includes at least one first jet flow channel, which branches off from the first connecting flow channel, and refrigerant is injected toward the first coil end through the first jet flow channel.
3. The motor unit of claim 2, wherein, The at least one first jet flow channel includes a plurality of first jet flow channels that are different from each other in the direction of injecting refrigerant.
4. The motor unit of claim 3, wherein, The refrigerant is injected through the first jet flow channel toward portions of the first coil end that are different from each other relative to the axial direction.
5. The motor unit according to claim 2, characterized in that, The stator flow channel is located at the upper part of the stator core.
6. The motor unit according to claim 1, characterized in that... It also includes a second connecting member disposed between the second end surface of the stator core and the second surface of the housing facing the second end surface, wherein: The housing further includes a second housing flow channel, the second housing flow channel having a third housing opening on the second surface; and The second connecting member includes a second connecting flow channel that provides communication between the third housing opening of the second housing flow channel and the second stator opening of the stator flow channel.
7. The motor unit according to claim 6, characterized in that... It also includes a stator coil disposed at the stator core, wherein: The stator coil includes a second coil end protruding from the second end surface of the stator core; and The second connecting member includes at least one second jet flow channel, which branches off from the second connecting flow channel, and refrigerant is injected toward the second coil end through the second jet flow channel.
8. The motor unit according to claim 1, characterized in that: The stator core includes a main body with a cylindrical shape and a protrusion that projects radially outward from the outer peripheral surface of the main body; and The protrusion is provided with the stator flow channel.
9. The motor unit according to claim 8, characterized in that, The protrusion is also provided with a fixing hole, through which the stator core is fixed to the housing.
10. The motor unit according to claim 9, characterized in that, The diameter of the stator flow channel is smaller than the diameter of the fixing hole.