Motor unit

Abstract

The invention relates to a motor unit. The motor unit includes a flow path. The flow path includes: a supply flow path for supplying a refrigerant; a discharge flow path for discharging the refrigerant; a first refrigerant system provided in a first range from the supply flow path toward one side in the circumferential direction to the discharge flow path; and a second refrigerant system provided in a second range extending from the supply flow path toward the other side in the circumferential direction to the discharge flow path. The first refrigerant system includes a first refrigerant flow path connecting the supply flow path and the discharge flow path, and a second refrigerant flow path connecting the supply flow path and the discharge flow path independently of the first refrigerant flow path.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a motor unit. Background Art

[0002] An international publication No. WO2023 / 074571 discloses a motor unit including: a motor extending along a central axis; a housing accommodating the motor; and a flow path provided in the housing and configured to allow a refrigerant to flow therethrough. The flow path includes: a supply flow path for supplying the refrigerant; a discharge flow path for discharging the refrigerant and having a position in the circumferential direction of the housing different from that of the supply flow path; a first refrigerant system provided in a first range reaching the discharge flow path from the supply flow path toward one side in the circumferential direction; and a second refrigerant system provided in a second range reaching the discharge flow path from the supply flow path toward the other side in the circumferential direction.

[0003] In the motor unit, in the first refrigerant system, the cooling capacity near the discharge flow path is lower than the cooling capacity near the supply flow path. In the first refrigerant system, it is desired to reduce the difference between the cooling capacity near the supply flow path and the cooling capacity near the discharge flow path. Summary of the Invention

[0004] In this specification, a technology capable of improving the cooling performance of a motor unit is provided.

[0005] In a first aspect of the present technology, a motor unit includes: a motor extending along a central axis; a housing accommodating the motor; and a flow path provided in the housing and configured to allow a refrigerant to flow along the circumferential direction of the housing. The flow path includes: a supply flow path for supplying the refrigerant; a discharge flow path for discharging the refrigerant and provided at a position in the circumferential direction different from that of the supply flow path; a first refrigerant system provided in a first range reaching the discharge flow path from the supply flow path toward one side in the circumferential direction; and a second refrigerant system provided in a second range reaching the discharge flow path from the supply flow path toward the other side in the circumferential direction. The first refrigerant system includes a first refrigerant flow path connecting the supply flow path and the discharge flow path and a second refrigerant flow path connecting the supply flow path and the discharge flow path independently of the first refrigerant flow path.

[0006] According to the above structure, compared with a structure in which the first refrigerant system has only one independent refrigerant flow path, the pressure loss in the first refrigerant system can be reduced. Therefore, the amount of the refrigerant supplied to the first refrigerant system can be increased. Therefore, in the first refrigerant system, the difference between the cooling capacity near the supply flow path and the cooling capacity near the discharge flow path can be reduced. As a result, the cooling performance of the motor unit can be improved.

[0007] The second mode is completed on the basis of the first mode above. Among them, the length along the circumferential direction of the first range, that is, the first length, is longer than the length along the circumferential direction of the second range, that is, the second length.

[0008] When the first length is longer than the second length, the difference between the cooling capacity near the supply flow path and the cooling capacity near the discharge flow path in the first refrigerant system is greater than the difference between the cooling capacity near the supply flow path and the cooling capacity near the discharge flow path in the second refrigerant system. According to the above structure, since the amount of refrigerant supplied to the first refrigerant system can be increased, the difference in cooling capacity in the first refrigerant system with a relatively large difference in cooling capacity can be reduced.

[0009] The third mode is completed on the basis of the first or second mode above. Among them, the first refrigerant flow path and the second refrigerant flow path may each include: a plurality of axial flow paths extending along the axial direction of the housing; and at least one circumferential flow path extending along the circumferential direction, and at least one circumferential flow path connects the plurality of axial flow paths in series.

[0010] It is possible to consider a structure in which the first refrigerant flow path and the second refrigerant flow path have a plurality of flow paths extending along the circumferential direction of the housing and at least one flow path extending along the axial direction. According to the above structure, compared with the structure in which a plurality of flow paths extending along the circumferential direction of the housing in the first refrigerant flow path and the second refrigerant flow path are connected in series by at least one flow path extending along the axial direction, the first refrigerant flow path and the second refrigerant flow path can be easily formed.

[0011] The fourth mode is completed on the basis of the third mode above. Among them, the housing may include a cylindrical central housing, a first cover connected to one end of the central housing in the axial direction, and a second cover connected to the other end of the central housing in the axial direction. The plurality of axial flow paths are provided in the central housing, and each of the at least one circumferential flow path may be provided on one of the first cover or the second cover.

[0012] According to the above structure, compared with the structure in which the housing is composed of two components, the first refrigerant flow path and the second refrigerant flow path can be easily formed.

[0013] The fifth mode is completed on the basis of the fourth mode above. Among them, all of the plurality of axial flow paths may be provided at positions at equal distances from the central axis of the cylindrical central housing. The at least one circumferential flow path may have a first circumferential flow path connecting two adjacent axial flow paths and a second circumferential flow path connecting two axial flow paths located on both sides of the two adjacent axial flow paths.

[0014] According to the above structure, compared with a structure in which each of a plurality of axial flow paths is radially disposed at different positions, a plurality of axial flow paths can be easily formed.

[0015] The sixth mode is completed on the basis of the above fourth or fifth mode, wherein, in the above first cover and the above second cover, the above first circumferential flow path may be at least partially adjacent to the above second circumferential flow path in the radial direction.

[0016] According to the above structure, compared with a structure in which the above first circumferential flow path and the above second circumferential flow path are at least partially adjacent to each other in the axial direction, a plurality of circumferential flow paths can be easily formed.

[0017] The seventh mode is completed on the basis of any one of the above first to sixth modes, wherein the above second refrigerant system may include a third refrigerant flow path connecting the above supply flow path and the above discharge flow path, and a fourth refrigerant flow path connecting the above supply flow path and the above discharge flow path independently of the above third refrigerant flow path.

[0018] According to the above structure, the pressure loss of the entire motor unit can be reduced. Therefore, the cooling capacity of the motor unit can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Hereinafter, with reference to the drawings, the features, advantages, techniques, and industrial importance of the exemplary embodiments of the present invention will be described. In the drawings, the same reference numerals denote the same components, wherein:

[0020] Figure 1 is a schematic diagram of the drive device 2.

[0021] Figure 2 is a rear view of the front cover 22 of the housing 12.

[0022] Figure 3 is a front view of the rear cover 24 of the housing 12.

[0023] Figure 4 is a schematic diagram of the refrigerant flow path in the housing 12.

[0024] Figure 5 is a schematic diagram of the refrigerant flow path according to the first modification. DETAILED DESCRIPTION OF THE INVENTION

[0025] Refer to Figures 1 to 4 to describe the drive device 2. The drive device 2 is mounted on an electric vehicle or the like. Among them, Figures 1 to 3 the front-rear direction, left-right direction, and up-down direction are directions marked for easy understanding of the description and do not define the actual direction. In addition, the "clockwise direction" and "counterclockwise direction" are described based on the direction of observing the drive device 2 from the rear.

[0026] As Figure 1 shown, the drive device 2 includes a motor unit 10 and a gear unit (not shown). The gear unit is disposed in front of the motor unit 10. The motor unit 10 includes a housing 12 and a motor 14.

[0027] The housing 12 includes a central housing 20, a front cover 22, and a rear cover 24. The central housing 20 has a cylindrical shape. The central housing 20 extends along the axis A direction. The axis A is the central axis of the motor 14. The front and rear ends of the central housing 20 are open. A plurality of axial flow paths 20A communicating with the central housing 20 are formed in the central housing 20. The plurality of axial flow paths 20A extend along the axis A direction.

[0028] As Figure 2 shown, the front cover 22 includes: a supply flow path 30 having a refrigerant supply port 30A; a discharge flow path 32 having a refrigerant discharge port 32A; a plurality of first inner flow paths 34A to 34F; and a plurality of first outer flow paths 36A to 36F. Herein, each of the plurality of first inner flow paths 34A to 34F and the plurality of first outer flow paths 36A to 36F may be collectively referred to as a "first inner flow path 34" and a "first outer flow path 36", respectively. The first inner flow paths 34 are arranged along the circumferential direction. The first inner flow paths 34 extend along the circumferential direction. Each of the two end portions in the circumferential direction of the first inner flow path 34 is connected to the front end portion of the axial flow path 20A of the central housing 20. That is, the first inner flow path 34 connects two axial flow paths 20A adjacent to each other in the circumferential direction.

[0029] The first outer flow paths 36 are arranged in the circumferential direction. The first outer flow paths 36 include first connection flow paths 38 and two first radial flow paths 40. Among them, for easy observation, the reference numerals of the first connection flow paths 38 and the two first radial flow paths 40 in the first outer flow paths 36B to 36F are omitted from the drawings. Each of the plurality of first outer flow paths 36A to 36F corresponds to each of the plurality of first inner flow paths 34A to 34F. The first connection flow paths 38 are provided radially outside the first inner flow paths 34 and extend in the circumferential direction. The end on the clockwise side of the first connection flow path 38 is located clockwise of the end on the clockwise side of the first inner flow path 34. The end on the counterclockwise side of the first connection flow path 38 is located counterclockwise of the end on the counterclockwise side of the first inner flow path 34. One of the two first radial flow paths 40 extends radially inward from the end on the counterclockwise side of the first connection flow path 38, and the other extends radially inward from the end on the clockwise side of the first connection flow path 38. In the radial direction, the positions of the radially inner ends of the two first radial flow paths 40 are the same as the position of the first inner flow path 34. The axially inner ends of the two first radial flow paths 40 are connected to the axial flow path 20A of the central housing 20. That is, the first outer flow path 36 connects the two axial flow paths 20A located on both sides of the two axial flow paths 20A connected by the first inner flow path 34.

[0030] The supply flow path 30 is provided at the central part of the first inner flow path 34A and the first outer flow path 36A in the circumferential direction. The supply flow path 30 communicates the refrigerant supply port 30A, the first inner flow path 34A, and the first outer flow path 36A. The discharge flow path 32 is provided at the central part of the first inner flow path 34F and the first outer flow path 36F in the circumferential direction. The discharge flow path 32 communicates the refrigerant discharge port 32A, the first inner flow path 34F, and the first outer flow path 36F.

[0031] As Figure 3 shown, the rear cover 24 includes a plurality of second inner flow paths 54A to 54F and a plurality of second outer flow paths 56A to 56F. Among them, hereinafter, each of the plurality of second inner flow paths 54A to 54F and the plurality of second outer flow paths 56A to 56F may be collectively referred to as "second inner flow path 54" and "second outer flow path 56". The second inner flow paths 54 are arranged in the circumferential direction. The second inner flow paths 54 extend in the circumferential direction. Each of the two end portions in the circumferential direction of the second inner flow path 54 is connected to the rear end portion of the axial flow path 20A of the central housing 20. That is, the second inner flow path 54 connects two axial flow paths 20A adjacent to each other in the circumferential direction.

[0032] The second outer flow paths 56 are arranged in the circumferential direction. The second outer flow paths 56 include second connecting flow paths 58 and two second radial flow paths 60. Among them, the reference numerals of the second connecting flow paths 58 and the two second radial flow paths 60 of the second outer flow paths 56B to 56F are omitted for easy observation. Each of the plurality of second outer flow paths 56A to 56F corresponds to each of the plurality of second inner flow paths 54A to 54F. The second connecting flow paths 58 are provided radially outside the second inner flow paths 54 and extend in the circumferential direction. The end on the clockwise side of the second connecting flow path 58 is located clockwise of the end on the clockwise side of the second inner flow path 54. The end on the counterclockwise side of the second connecting flow path 58 is located counterclockwise of the end on the counterclockwise side of the second inner flow path 54. One of the two second radial flow paths 60 extends radially inward from the end on the counterclockwise side of the second connecting flow path 58, and the other extends radially inward from the end on the clockwise side of the second connecting flow path 58. In the radial direction, the positions of the radially inner ends of the two second radial flow paths 60 are the same as the position of the second inner flow path 54. The axial flow path 20A of the central housing 20 is connected to the radially inner ends of the two second radial flow paths 60. That is, the second outer flow path 56 connects the two axial flow paths 20A located on both sides of the two axial flow paths 20A connected by the second inner flow path 54.

[0033] As Figure 1 shown, the motor 14 extends along the central axis A. The motor 14 is housed in the housing 12. The motor 14 includes a motor shaft 70, a rotor 72, and a stator 74. The motor shaft 70 extends in the direction of the axis A. The motor shaft 70 is rotatably supported by the front cover 22 and the rear cover 24 of the housing 12 by bearings. The rotor 72 is fixed to the motor shaft 70. The stator 74 is fixed to the inner wall of the central housing 20 of the housing 12 by thermal press fitting or the like.

[0034] A high-voltage current flows through the coil (not shown) of the stator 74. Therefore, the stator 74 generates heat. In order to cool the stator 74, the refrigerant flows through the flow paths in the housing 12.

[0035] (Flow paths in the housing 12)

[0036] Refer to Figures 2 to 4 to describe the flow paths in the housing 12. Figure 4 is an expanded view of the flow paths in the housing 12. Among them, in Figure 4 it, the positions in the left-right direction of the first inner flow path 34 and the positions in the left-right direction of the first connecting flow path 38 of the first outer flow path 36 are offset for easy observation. In addition, the positions in the left-right direction of the second inner flow path 54 and the positions in the left-right direction of the second connecting flow path 58 of the second outer flow path 56 are also offset.

[0037] As Figure 4 shown, the flow path within the housing 12 includes a supply flow path 30, a discharge flow path 32, a first refrigerant system 80, and a second refrigerant system 82. The first refrigerant system 80 is disposed in a first range R1 that extends from the supply flow path 30 toward the counterclockwise side in the circumferential direction (the upper side in Figure 4 ), and reaches the discharge flow path 32. The second refrigerant system 82 is disposed in a second range R2 that extends from the supply flow path 30 toward the clockwise side in the circumferential direction (the lower side in Figure 4 ), and reaches the discharge flow path 32. The length in the circumferential direction of the first range R1, i.e., the first length L1, is longer than the length in the circumferential direction of the second range R2, i.e., the second length L2.

[0038] The first refrigerant system 80 includes a first refrigerant flow path 90 and a second refrigerant flow path 92. The first refrigerant flow path 90 and the second refrigerant flow path 92 each connect the supply flow path 30 and the discharge flow path 32. In Figure 4 , the arrow indicating the direction in which the refrigerant flows in the first refrigerant flow path 90 is shown as a thin arrow, and the arrow indicating the direction in which the refrigerant flows in the second refrigerant flow path 92 is shown as a thick arrow. The first refrigerant flow path 90 is composed of a portion on the counterclockwise side of the first outer flow path 36A of the front cover 22, the first outer flow paths 36B to 36E of the front cover 22, a portion on the clockwise side of the first outer flow path 36F, the second inner flow paths 54A to 54E of the rear cover 24, and a plurality of axial flow paths 20A that connect the respective flow paths of the front cover 22 and the respective flow paths of the rear cover 24. That is, the axial flow paths 20A in the first refrigerant flow path 90 are connected in series by the first outer flow path 36 and the second inner flow path 54. In addition, the second refrigerant flow path 92 is composed of a portion on the counterclockwise side of the first inner flow path 34A of the front cover 22, the first inner flow paths 34B to 34E of the front cover 22, a portion on the clockwise side of the first inner flow path 34F, the second outer flow paths 56A to 56E of the rear cover 24, and a plurality of axial flow paths 20A that connect the respective flow paths of the front cover 22 and the respective flow paths of the rear cover 24. That is, the axial flow paths 20A in the second refrigerant flow path 92 are connected in series by the first inner flow path 34 and the second outer flow path 56. Within the first range R1, the first refrigerant flow path 90 and the second refrigerant flow path 92 do not cross. That is, the first refrigerant flow path 90 and the second refrigerant flow path 92 are independent flow paths. In the first range R1, the refrigerant meanders along the axis A direction within the first refrigerant flow path 90 and the second refrigerant flow path 92.

[0039] The second refrigerant system 82 includes a third refrigerant flow path 100 and a fourth refrigerant flow path 102. The third refrigerant flow path 100 and the fourth refrigerant flow path 102 each connect the supply flow path 30 and the discharge flow path 32. InFigure 4 In Figure 4 , the arrow indicating the flow direction of the refrigerant in the third refrigerant flow path 100 is shown as a thin arrow, and the arrow indicating the flow direction of the refrigerant in the fourth refrigerant flow path 102 is shown as a thick arrow. The third refrigerant flow path 100 is composed of a portion on the clockwise side of the first outer flow path 36A of the front cover 22, a portion on the counterclockwise side of the first outer flow path 36F, the second inner flow path 54F of the rear cover 24, and a plurality of axial flow paths 20A connecting the flow paths of the front cover 22 and the flow paths of the rear cover 24. That is, the axial flow paths 20A in the third refrigerant flow path 100 are connected in series by the first outer flow path 36 and the second inner flow path 54. In addition, the fourth refrigerant flow path 102 is composed of a portion on the clockwise side of the first inner flow path 34A of the front cover 22, a portion on the counterclockwise side of the first inner flow path 34F, the second outer flow path 56F of the rear cover 24, and a plurality of axial flow paths 20A connecting the flow paths of the front cover 22 and the flow paths of the rear cover 24. That is, the axial flow paths 20A in the fourth refrigerant flow path 102 are connected in series by the first inner flow path 34 and the second outer flow path 56. In the second range R2, the third refrigerant flow path 100 and the fourth refrigerant flow path 102 do not cross. That is, the third refrigerant flow path 100 and the fourth refrigerant flow path 102 are independent flow paths. In the second range R2, the refrigerant meanders along the axis A direction within the third refrigerant flow path 100 and the fourth refrigerant flow path 102.

[0040] As described above, as Figure 1 , Figure 4 shown, the motor unit 10 includes: a motor 14 extending along the axis A direction; a housing 12 housing the motor 14; and a flow path provided in the housing 12 and configured to allow the refrigerant to flow in the circumferential direction (an example of the "circumferential direction") of the housing 12. The flow path includes: a supply flow path 30 for supplying the refrigerant; a discharge flow path 32 for discharging the refrigerant, the position in the circumferential direction being different from that of the supply flow path 30; a first refrigerant system 80 provided in the first range R1; and a second refrigerant system 82 provided in the second range R2. The first refrigerant system 80 includes a first refrigerant flow path 90 connecting the supply flow path 30 and the discharge flow path 32 and a second refrigerant flow path 92 connecting the supply flow path 30 and the discharge flow path 32 independently of the first refrigerant flow path 90.

[0041] According to the above structure, compared with the structure in which the first refrigerant system 80 only has one independent refrigerant flow path, the pressure loss in the first refrigerant system 80 can be reduced. Therefore, the amount of refrigerant supplied to the first refrigerant system 80 can be increased. Thus, in the first refrigerant system 80, the difference between the cooling capacity near the supply flow path 30 and the cooling capacity near the discharge flow path 32 can be reduced. As a result, the cooling performance of the motor unit 10 can be improved.

[0042] In addition, as Figure 4 shown, the length in the circumferential direction of the first range R1, that is, the first length L1, is longer than the length in the circumferential direction of the second range R2, that is, the second length L2.

[0043] When the first length L1 is longer than the second length L2, the difference between the cooling capacity near the supply flow path 30 and the cooling capacity near the discharge flow path 32 in the first refrigerant system 80 is greater than the difference between the cooling capacity near the supply flow path 30 and the cooling capacity near the discharge flow path 32 in the second refrigerant system 82. According to the above structure, since the amount of refrigerant supplied to the first refrigerant system 80 can be increased, the difference in cooling capacity in the first refrigerant system 80 where the difference in cooling capacity is relatively large can be reduced.

[0044] In addition, as Figure 4 shown, the first refrigerant flow path 90 and the second refrigerant flow path 92 have a plurality of axial flow paths 20A extending along the axial direction of the housing 12 and at least one circumferential flow path extending in the circumferential direction (for example, the first inner flow path 34, the first outer flow path 36, the second inner flow path 54, and the second outer flow path 56). The plurality of axial flow paths 20A in the first refrigerant flow path 90 and the second refrigerant flow path 92 are connected in series by at least one circumferential flow path.

[0045] A structure in which the first refrigerant flow path 90 and the second refrigerant flow path 92 have a plurality of flow paths extending in the circumferential direction of the housing 12 and at least one flow path extending in the direction of the axis A can be considered. According to the above structure, the first refrigerant flow path 90 and the second refrigerant flow path 92 can be formed more easily than a structure in which a plurality of flow paths extending in the circumferential direction of the housing 12 are connected in series by at least one flow path extending in the direction of the axis A.

[0046] In addition, as Figure 1 shown, the housing 12 includes a cylindrical central housing 20, a front cover 22 (an example of a "first cover") connected to the front end (an example of an "one end") of the central housing 20 in the direction of the axis A, and a rear cover 24 (an example of a "second cover") connected to the rear end (an example of the "other end") of the central housing 20 in the direction of the axis A. A plurality of axial flow paths 20A are provided in the central housing 20, and at least one circumferential flow path is provided in either the front cover 22 or the rear cover 24.

[0047] According to the above structure, the first refrigerant flow path 90 and the second refrigerant flow path 92 can be formed more easily than a structure in which the housing 12 is composed of two components.

[0048] In addition, as Figure 2 , Figure 3As shown, all of the plurality of axial flow paths 20A are arranged at the same position in the radial direction. That is, the plurality of axial flow paths (20A) are arranged at positions having the same distance from the central axis of the cylindrical central housing. As Figure 4 shown, at least one circumferential flow path has a first inner flow path 34 and a second inner flow path 54 (an example of a "first circumferential flow path") that connect two adjacent axial flow paths 20A, and a first outer flow path 36 and a second outer flow path 56 (an example of a "second circumferential flow path") that connect two axial flow paths 20A located on both sides of the two axial flow paths 20A.

[0049] According to the above structure, compared with a structure in which each of the plurality of axial flow paths 20A is arranged at a different position in the radial direction, the plurality of axial flow paths 20A can be easily formed.

[0050] In addition, as Figure 4 shown, in the front cover 22 or the rear cover 24, the first inner flow path 34, the second inner flow path 54, the first outer flow path 36, and the second outer flow path 56 are at least partially adjacent in the radial direction.

[0051] According to the above structure, compared with a structure in which the first inner flow path 34, the second inner flow path 54, the first outer flow path 36, and the second outer flow path 56 are at least partially adjacent in the direction of axis A, a plurality of circumferential flow paths can be easily formed.

[0052] In addition, as Figure 4 shown, the second refrigerant system 82 includes a third refrigerant flow path 100 that connects the supply flow path 30 and the discharge flow path 32, and a fourth refrigerant flow path 102 that independently connects the supply flow path 30 and the discharge flow path 32 with respect to the third refrigerant flow path 100.

[0053] According to the above structure, the pressure loss of the entire motor unit 10 can be reduced. Therefore, the cooling capacity of the motor unit 10 can be improved.

[0054] The specific examples of the technology disclosed in this specification have been described in detail above, but these are merely examples and do not limit the scope of the claims of the present application. The technology described in the claims of the present application includes technologies obtained by various modifications and changes to the above-described specific examples.

[0055] First Modification Example

[0056] As Figure 5As shown, the second refrigerant system 182 may have only one refrigerant flow path 200. In this modification, the first outer flow path 36A of the front cover 22 does not have the first radial flow path 40 on the clockwise side, and the first outer flow path 36F of the front cover 22 does not have the first radial flow path 40 on the clockwise side. In addition, the rear cover 24 does not have the second outer flow path 56F. With such a structure, compared with the structure in which the first refrigerant system and the second refrigerant system each have only one flow path, the amount of refrigerant supplied to the first refrigerant system 80 can be increased. Therefore, the difference in cooling capacity between the vicinity of the supply flow path 30 of the first refrigerant system 80 and the vicinity of the discharge flow path 32 of the first refrigerant system 80 can be reduced. In addition, the difference in cooling capacity between the first refrigerant system 80 and the second refrigerant system 182 can be reduced.

[0057] Second modification

[0058] The first length L1 of the first range R1 and the second length L2 of the second range R2 may be the same.

[0059] Third modification

[0060] The first refrigerant system 80 may have three or more independent refrigerant flow paths. The second refrigerant system 82 may also have three or more independent refrigerant flow paths.

[0061] Fourth modification

[0062] The first outer flow path 36 may not have two first radial flow paths 40. In addition, the second outer flow path 56 may not have two second radial flow paths 60. In this modification, the axial flow path 20A of the central housing 20 is inclined with respect to the direction of the axis A.

[0063] Fifth modification

[0064] The front cover 22 may not have the first outer flow path 36A. In this modification, the first inner flow path 34A extends between the circumferential positions of the first radial flow paths 40 at both ends in the first outer flow path 36A.

[0065] Sixth modification

[0066] The first refrigerant flow path 90 and the second refrigerant flow path 92 may be flow paths that meander in the circumferential direction.

[0067] In addition, the technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the technical solutions at the time of application. In addition, the technologies illustrated in this specification or the drawings can achieve multiple purposes at the same time, and achieving one of the purposes itself has technical usefulness.

Claims

1. A motor unit, characterized in that, Comprising: A motor extending along a central axis; A housing for accommodating the motor; And A flow path provided in the housing and configured to allow a refrigerant to flow circumferentially along the housing, Wherein, The flow path includes: A supply flow path for supplying the refrigerant; A discharge flow path for discharging the refrigerant and provided at a position different from the supply flow path in the circumferential direction; A first refrigerant system provided in a first range which is a range from the supply flow path toward one side in the circumferential direction to the discharge flow path; and A second refrigerant system provided in a second range which is a range from the supply flow path toward the other side in the circumferential direction to the discharge flow path, The first refrigerant system includes a first refrigerant flow path connecting the supply flow path and the discharge flow path and a second refrigerant flow path independently connecting the supply flow path and the discharge flow path to the first refrigerant flow path.

2. The motor unit according to claim 1, wherein The length in the circumferential direction of the first range, i.e., the first length, is longer than the length in the circumferential direction of the second range, i.e., the second length.

3. The motor unit according to claim 1, wherein The first refrigerant flow path and the second refrigerant flow path each include: A plurality of axial flow paths extending along the axial direction of the housing; and At least one circumferential flow path extending along the circumferential direction, and at least one circumferential flow path connects the plurality of axial flow paths in series.

4. The motor unit according to claim 3, wherein The housing includes a cylindrical central housing, a first cover connected to one end of the central housing in the axial direction, and a second cover connected to the other end of the central housing in the axial direction, The plurality of axial flow paths are provided in the central housing, Each of the at least one circumferential flow path is provided in either the first cover or the second cover.

5. The motor unit according to claim 4, wherein All of the plurality of axial flow paths are provided at positions at an equal distance from the central axis of the cylindrical central housing, The at least one circumferential flow path has a first circumferential flow path connecting two adjacent axial flow paths and a second circumferential flow path connecting two axial flow paths located on both sides of the two adjacent axial flow paths.

6. The motor unit according to claim 5, wherein In the first cover and the second cover, the first circumferential flow path is at least partially adjacent to the second circumferential flow path in the radial direction.

7. The motor unit according to claim 1, wherein The second refrigerant system includes a third refrigerant flow path connecting the supply flow path and the discharge flow path and a fourth refrigerant flow path independently connecting the supply flow path and the discharge flow path to the third refrigerant flow path.

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