Motor unit

Abstract

To provide a technique that can improve cooling performance of a motor unit.SOLUTION: A motor unit comprises a motor extending along a central axis, a housing that houses the motor, and a flow path, provided on the housing, which is configured to flow coolants in a circumferential direction of the housing. The flow path comprises: a supply flow path to which coolants are supplied; an ejection flow path from which the coolants are ejected, whose position is different from the position of the supply flow path in the circumferential direction of the housing; a first coolant system provided on a first range extending from the supply flow path to the ejection flow path, toward one side in the circumferential direction; and a second coolant system provided on a second range extending from the supply flow path to the ejection flow path, toward the other side in the circumferential direction. The first coolant system comprises a first coolant flow path through which the supply flow path is connected to the ejection flow path, and a second coolant flow path, formed independently from the first coolant flow path, through which the supply flow path is connected to the ejection flow path.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] Patent Document 1 discloses a motor unit including a motor extending along a central axis, a housing that accommodates the motor, and a flow path provided in the housing and configured to allow a refrigerant to circulate. The flow path includes a supply flow path through which the refrigerant is supplied, a discharge flow path through which the refrigerant is discharged and which is positioned differently in the circumferential direction of the housing from the supply flow path, a first refrigerant system provided in a first range extending from the supply flow path to 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 to the other side in the circumferential direction to the discharge flow path. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2023 / 074571 Summary of the Invention [Problem to be solved by the invention]

[0004] In the motor unit, the cooling capacity in the first refrigerant system near the discharge passage is lower than the cooling capacity in the supply passage, and it is desirable to reduce the difference between the cooling capacity in the first refrigerant system near the supply passage and the cooling capacity in the supply passage.

[0005] This specification provides a technique that can improve the cooling performance of a motor unit. [Means for solving the problem]

[0006] In a first aspect of the present technology, the motor unit may include a motor extending along a central axis, a housing that houses the motor, and a flow path provided in the housing and configured such that a refrigerant flows in a circumferential direction of the housing. The flow path may include a supply flow path to which the refrigerant is supplied, a discharge flow path from which the refrigerant is discharged and whose position in the circumferential direction is different from that of the supply flow path, a first refrigerant system provided in a first range extending 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 may include 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.

[0007] According to the above configuration, compared with a configuration in which the first refrigerant system includes 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. Accordingly, 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.

[0008] In a second aspect, in the first aspect, a first length in the circumferential direction of the first range may be longer than a second length in the circumferential direction of the second range.

[0009] 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 larger 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 configuration, since the amount of the refrigerant supplied to the first refrigerant system can be increased, the difference in the cooling capacity in the first refrigerant system, where the difference in the cooling capacity is relatively large, can be reduced.

[0010] In a third aspect, in the first or second aspect, the first refrigerant flow path and the second refrigerant flow path may include a plurality of axial flow paths extending in the axial direction of the housing and at least one circumferential flow path extending in the circumferential direction. The plurality of axial flow paths in the first refrigerant flow path and the second refrigerant flow path may be connected in series by the at least one circumferential flow path.

[0011] A configuration in which the first refrigerant flow path and the second refrigerant flow path include a plurality of flow paths extending in the circumferential direction of the housing and at least one flow path extending in the axial direction is conceivable. According to the above configuration, the first refrigerant flow path and the second refrigerant flow path can be more easily formed as compared with a configuration in which a plurality of flow paths extending in 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 in the axial direction.

[0012] In a fourth aspect, in the third aspect, 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 the at least one circumferential flow path may be provided in one of the first cover or the second cover.

[0013] According to the above configuration, the first refrigerant flow path and the second refrigerant flow path can be more easily formed as compared with a configuration in which the housing is composed of two members.

[0014] In a fifth aspect, in the fourth aspect, all of the plurality of axial flow paths may be provided at the same position in the radial direction. The at least one circumferential flow path may include 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 axial flow paths.

[0015] According to the above configuration, it is possible to easily form a plurality of axial flow paths as compared with a configuration in which each of the plurality of axial flow paths is provided at different positions in the radial direction.

[0016] In a sixth aspect, in the fourth or fifth aspect, in the first cover and the second cover, the first circumferential flow path and the second circumferential flow path may be at least partially adjacent to each other in the radial direction.

[0017] According to the above configuration, it is possible to easily form a plurality of circumferential flow paths as compared with a configuration in which the first circumferential flow path and the second circumferential flow path are at least partially adjacent to each other in the axial direction.

[0018] In a seventh aspect, in any one of the first to sixth aspects, the second refrigerant system may include a third refrigerant flow path connecting the supply flow path and the discharge flow path, and a fourth refrigerant flow path independent of the third refrigerant flow path and connecting the supply flow path and the discharge flow path.

[0019] According to the above configuration, 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

[0020]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0021] (Example) Referring to FIGS. 1 to 4, the drive device 2 will be described. The drive device 2 is mounted on an electric vehicle or the like. Note that the front-rear direction, left-right direction, and up-down direction in FIGS. 1 to 3 are provided for easier understanding of the description and do not define the actual directions. Also, hereinafter, based on the direction of viewing the drive device 2 from the rear, the "clockwise direction" and "counterclockwise direction" will be described.

[0022] As shown in FIG. 1, the drive device 2 includes a motor unit 10 and a gear unit (not shown). The gear unit is provided in front of the motor unit 10. The motor unit 10 includes a housing 12 and a motor 14.

[0023] 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 direction of axis A. Axis A is the central axis of the motor 14. Both 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 direction of axis A.

[0024] As shown in FIG. 2, 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. Hereinafter, 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 the "first inner flow path 34" and the "first outer flow path 36". The first inner flow paths 34 are arranged along the circumferential direction. The first inner flow paths 34 extend along the circumferential direction. The front end portions of the axial flow paths 20A of the central housing 20 are connected to both ends in the circumferential direction of each of the first inner flow paths 34. That is, the first inner flow path 34 connects two adjacent axial flow paths 20A in the circumferential direction.

[0025] The first outer flow paths 36 are arranged along the circumferential direction. The first outer flow paths 36 include a first connection flow path 38 and two first radial flow paths 40. For ease of viewing, the reference numerals of the first connection flow path 38 and the two first radial flow paths 40 in the first outer flow paths 36B to 36F are not shown. 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 path 38 is provided radially outside the first inner flow path 34 and extends along 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 axial flow path 20A of the central housing 20 is connected to the radially inner ends of the two first radial flow paths 40. That is, the first outer flow path 36 connects two axial flow paths 20A located on both sides of the two axial flow paths 20A connected by the first inner flow path 34.

[0026] The supply flow path 30 is provided at the central portions 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 with the first inner flow path 34A and the first outer flow path 36A. The discharge flow path 32 is provided at the central portions 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 with the first inner flow path 34F and the first outer flow path 36F.

[0027] As shown in FIG. 3, the rear cover 24 includes a plurality of second inner channels 54A to 54F and a plurality of second outer channels 56A to 56F. Hereinafter, each of the plurality of second inner channels 54A to 54F and each of the plurality of second outer channels 56A to 56F may be collectively referred to as "second inner channel 54" and "second outer channel 56". The second inner channels 54 are arranged along the circumferential direction. The second inner channels 54 extend along the circumferential direction. At each of both ends of the second inner channel 54 in the circumferential direction, the rear end of the axial channel 20A of the central housing 20 is connected. That is, the second inner channel 54 connects two axial channels 20A adjacent to each other in the circumferential direction.

[0028] The second outer channels 56 are arranged along the circumferential direction. The second outer channel 56 includes a second connecting channel 58 and two second radial channels 60. For ease of viewing, the illustration of the reference numerals of the second connecting channel 58 of the second outer channels 56B to 56F and the two second radial channels 60 is omitted. Each of the plurality of second outer channels 56A to 56F corresponds to each of the plurality of second inner channels 54A to 54F. The second connecting channel 58 is provided radially outside the second inner channel 54 and extends along the circumferential direction. The end on the clockwise side of the second connecting channel 58 is located clockwise of the end on the clockwise side of the second inner channel 54. The end on the counterclockwise side of the second connecting channel 58 is located counterclockwise of the end on the counterclockwise side of the second inner channel 54. One of the two second radial channels 60 extends radially inward from the end on the counterclockwise side of the second connecting channel 58, and the other extends radially inward from the end on the clockwise side of the second connecting channel 58. In the radial direction, the positions of the radially inner ends of the two second radial channels 60 are the same as the position of the second inner channel 54. The axial channel 20A of the central housing 20 is connected to the radially inner ends of the two second radial channels 60. That is, the second outer channel 56 connects two axial channels 20A located on both sides of the two axial channels 20A connected by the second inner channel 54.

[0029] As shown in FIG. 1, the motor 14 extends along the central axis A. The motor 14 is housed within the housing 12. The motor 14 includes a motor shaft 70, a rotor 72, and a stator 74. The motor shaft 70 extends along the axial 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 shrink fitting or the like.

[0030] A high-voltage current flows through the coil (not shown) of the stator 74. For this reason, the stator 74 generates heat. In order to cool the stator 74, a refrigerant flows through the flow path within the housing 12.

[0031] (Flow path within the housing 12) With reference to FIGS. 2 to 4, the flow path within the housing 12 will be described. FIG. 4 is a developed view of the flow path within the housing 12. In FIG. 4, for ease of viewing, the horizontal position of the first inner flow path 34 and the horizontal positions of the first connection flow path 38 of the first outer flow path 36 are offset. Also, the horizontal position of the second inner flow path 54 and the horizontal positions of the second connection flow path 58 of the second outer flow path 56 are offset.

[0032] As shown in FIG. 4, 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 provided in a first range R1 extending from the supply flow path 30 toward the discharge flow path 32 in the counterclockwise direction (upper side in FIG. 4) in the circumferential direction. The second refrigerant system 82 is provided in a second range R2 extending from the supply flow path 30 toward the discharge flow path 32 in the clockwise direction (lower side in FIG. 4) in the circumferential direction. The first length L1 in the circumferential direction of the first range R1 is longer than the second length L2 in the circumferential direction of the second range R2.

[0033] 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 FIG. 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 includes a counterclockwise-side portion 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 clockwise-side portion 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. Further, the second refrigerant flow path 92 includes a counterclockwise-side portion 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 clockwise-side portion 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. In the first range R1, the first refrigerant flow path 90 and the second refrigerant flow path 92 do not intersect. 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 flows in a meandering manner in the axial direction A within the first refrigerant flow path 90 and the second refrigerant flow path 92.

[0034] 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 a supply flow path 30 and a discharge flow path 32. In FIG. 4, an arrow indicating the direction in which the refrigerant flows in the third refrigerant flow path 100 is shown as a thin arrow, and an arrow indicating the direction in which the refrigerant flows 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 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 third refrigerant flow path 100 are connected in series by the first outer flow path 36 and the second inner flow path 54. Further, 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 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 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 intersect. 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 flows in a meandering manner in the axial direction A within the third refrigerant flow path 100 and the fourth refrigerant flow path 102.

[0035] As described above, as shown in FIGS. 1 and 4, the motor unit 10 includes a motor 14 extending along the axis A direction, a housing 12 for housing the motor 14, and a flow path provided in the housing 12 and configured such that a refrigerant flows in the circumferential direction (an example of the "circumferential direction") of the housing 12. The flow path includes a supply flow path 30 to which the refrigerant is supplied, a discharge flow path 32 from which the refrigerant is discharged and whose position in the circumferential direction is different from that of the supply flow path 30, a first refrigerant system 80 provided in a first range R1, and a second refrigerant system 82 provided in a 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.

[0036] According to the above configuration, compared with the configuration in which the first refrigerant system 80 includes only 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. Accordingly, in the first refrigerant system 80, the difference between the cooling capacity in the vicinity of the supply flow path 30 and the cooling capacity in the vicinity of the discharge flow path 32 can be reduced. As a result, the cooling performance of the motor unit 10 can be improved.

[0037] Also, as shown in FIG. 4, a first length L1 in the circumferential direction of the first range R1 is longer than a second length in the circumferential direction of the second range R2.

[0038] When the first length L1 is longer than the second length L2, the difference between the cooling capacity in the vicinity of the supply flow path 30 and the cooling capacity in the vicinity of the discharge flow path 32 in the first refrigerant system 80 is larger than the difference between the cooling capacity in the vicinity of the supply flow path 30 and the cooling capacity in the vicinity of the discharge flow path 32 in the second refrigerant system 82. According to the above configuration, 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.

[0039] Also, as shown in FIG. 4, the first refrigerant flow path 90 and the second refrigerant flow path 92 include a plurality of axial flow paths 20A extending in the axial direction of the housing 12 and at least one circumferential flow path (e.g., the first inner flow path 34, the first outer flow path 36, the second inner flow path 54, the second outer flow path 56) extending in the circumferential direction. 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.

[0040] A configuration 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 axis A is conceivable. According to the above configuration, the first refrigerant flow path 90 and the second refrigerant flow path 92 can be easily formed as compared with a configuration 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 axis A.

[0041] Also, as shown in FIG. 1, 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 "one end") of the central housing 20 in the direction of 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 axis A. The plurality of axial flow paths 20A are provided in the central housing 20, and at least one circumferential flow path is provided in one of the front cover 22 or the rear cover 24.

[0042] According to the above configuration, the first refrigerant flow path 90 and the second refrigerant flow path 92 can be easily formed as compared with a configuration in which the housing 12 is composed of two members.

[0043] Also, as shown in FIGS. 2 and 3, all of the plurality of axial flow paths 20A are provided at the same position in the radial direction. As shown in FIG. 4, at least one circumferential flow path includes 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.

[0044] According to the above configuration, compared with a configuration in which each of the plurality of axial flow paths 20A is provided at a different position in the radial direction, the plurality of axial flow paths 20A can be easily formed.

[0045] Also, as shown in FIG. 4, 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.

[0046] According to the above configuration, compared with a configuration 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.

[0047] Also, as shown in FIG. 4, 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 is independent of the third refrigerant flow path 100 and connects the supply flow path 30 and the discharge flow path 32.

[0048] According to the above configuration, the pressure loss of the entire motor unit 10 can be reduced. Therefore, the cooling capacity of the motor unit 10 can be improved.

[0049] As described above, specific examples of the technology disclosed in this specification have been described in detail, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

[0050] (First Modified Example) As shown in FIG. 5, the second refrigerant system 182 may include only one refrigerant flow path 200. In this modified example, the first outer flow path 36A of the front cover 22 does not include the first radial flow path 40 on the clockwise side, and the first outer flow path 36F of the front cover 22 does not include the first radial flow path 40 on the clockwise side. Also, the rear cover 24 does not include the second outer flow path 56F. With such a configuration, compared with the configuration 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. For this reason, the difference between the cooling capacity in the vicinity of the supply flow path 30 of the first refrigerant system 80 and the cooling capacity in the vicinity of the discharge flow path 32 of the first refrigerant system 80 can be reduced. Also, the difference between the cooling capacity of the first refrigerant system 80 and the cooling capacity of the second refrigerant system 182 can be reduced.

[0051] (Second Modified Example) The first length L1 of the first range R1 and the second length L2 of the second range R2 may be the same.

[0052] (Third Modified Example) 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.

[0053] (Fourth Modified Example) The first outer flow path 36 may not include two first radial flow paths 40. Also, the second outer flow path 56 may not include two second radial flow paths 60. In this modified example, the axial flow path 20A of the central housing 20 is inclined with respect to the axis A direction.

[0054] (Fifth Modified Example) The front cover 22 may not include the first outer flow path 36A. In this modified example, 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.

[0055] (Sixth Modified Example) The first refrigerant flow path 90 and the second refrigerant flow path 92 may be flow paths that meander in the circumferential direction.

[0056] In addition, the technical elements described in this specification or the drawings exhibit technical utility either alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Also, the technologies exemplified in this specification or the drawings can achieve multiple purposes simultaneously, and achieving one of those purposes by itself has technical utility.

Description of Reference Numerals

[0057] 2: Driving device, 10: Motor unit, 12: Housing, 14: Motor, 20: Central housing, 20A: Axial flow path, 22: Front cover, 24: Rear cover, 30: Supply flow path, 30A: Refrigerant supply port, 32: Discharge flow path, 32A: Refrigerant discharge port, 34, 34A - 34F: First inner flow path, 36, 36A - 36F: First outer flow path, 38: First connection flow path, 40: First radial flow path, 54, 54A - 54F: Second inner flow path, 56, 56A - 56F: Second outer flow path, 58: Second connection flow path, 60: Second radial flow path, 70: Motor shaft, 72: Rotor, 74: Stator, 80: First refrigerant system, 82: Second refrigerant system, 90: First refrigerant flow path, 92: Second refrigerant flow path, 100: Third refrigerant flow path, 102: Fourth refrigerant flow path

Claims

1. a motor extending along a central axis; a housing that accommodates the motor; a flow path provided in the housing, the flow path being configured to allow a coolant to flow in a circumferential direction of the housing; Equipped with The flow path is a supply flow path through which the coolant is supplied; a discharge flow path through which the coolant is discharged and which is positioned differently in the circumferential direction from the supply flow path; a first refrigerant system provided in a first range extending from the supply flow path toward one side in the circumferential direction to the discharge flow path; 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, independent of the first refrigerant flow path. Motor unit.

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

3. the first refrigerant flow path and the second refrigerant flow path have a plurality of axial flow paths extending in an axial direction of the housing and at least one circumferential flow path extending in the circumferential direction, The motor unit according to claim 1 , wherein the plurality of axial flow passages in the first refrigerant flow passage and the plurality of axial flow passages in the second refrigerant flow passage are connected in series by the at least one circumferential flow passage.

4. 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 passages are provided in the center housing, The motor unit according to claim 3 , wherein the at least one circumferential flow passage is provided in one of the first cover and the second cover.

5. All of the plurality of axial flow paths are provided at the same position in the radial direction, 5. The motor unit according to claim 4, wherein the at least one circumferential flow passage includes a first circumferential flow passage connecting two adjacent axial flow passages, and a second circumferential flow passage connecting two axial flow passages located on either side of the two axial flow passages.

6. The motor unit according to claim 5 , wherein the first circumferential flow passage and the second circumferential flow passage are at least partially adjacent to each other in the radial direction in the first cover and the second cover.

7. 2. 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 connecting the supply flow path and the discharge flow path independently of the third refrigerant flow path.

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