Motor unit

Abstract

The motor unit (10) includes a flow path. The flow path includes a supply flow path (30) through which refrigerant is supplied, a discharge flow path (32) through which refrigerant is discharged, a first refrigerant system (80) provided in a first range extending from the supply flow path (30) toward one side in the circumferential direction to the discharge flow path (32), and a second refrigerant system (82) provided in a second range extending from the supply flow path (30) toward the other side in the circumferential direction to the discharge flow path (32). 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).

Description

Technology Field

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

[0002] International Publication No. 2023 / 074571 discloses a motor unit comprising a motor extending along a central axis, a housing for housing the motor, and a flow path provided in the housing and configured to allow refrigerant to flow. The flow path comprises a supply flow path through which refrigerant is supplied, a discharge flow path through which refrigerant is discharged and which is located at a different position from the supply flow path in the circumferential direction of the housing, 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 problem to be solved

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

[0004] The present specification provides a technology that can improve the cooling performance of a motor unit. means of solving the problem

[0005] In a first embodiment of the present invention, a motor unit comprises a motor extending along a central axis, a housing for housing the motor, and a flow path provided in the housing and configured to allow refrigerant to flow in the circumferential direction of the housing. The flow path comprises a supply flow path through which the refrigerant is supplied, a discharge flow path through which the refrigerant is discharged and which is provided at a position different from the supply flow path in the circumferential direction, a first refrigerant system provided in a first range extending from the supply flow path toward one side of 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 of the circumferential direction to the discharge flow path. The first refrigerant system comprises 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 configuration, pressure loss in the first refrigerant system can be reduced compared to a configuration in which the first refrigerant system has only one independent refrigerant path. For this reason, the amount of refrigerant supplied to the first refrigerant system can be increased. Consequently, in the first refrigerant system, the difference between the cooling capacity near the supply path and the cooling capacity near the discharge path can be reduced. As a result, the cooling performance of the motor unit can be improved.

[0007] In the second embodiment, the first length, which is the length along the perimeter of the first range in the first embodiment, may be longer than the second length, which is the length along the perimeter of the second range.

[0008] In the case where the first length is longer than the second length, the difference between the cooling capacity near the supply path and the cooling capacity near the discharge path in the first refrigerant system becomes greater than the difference between the cooling capacity near the supply path and the cooling capacity near the discharge path in the second refrigerant system. According to the above configuration, since the amount of refrigerant supplied to the first refrigerant system can be increased, the difference in cooling capacity in the first refrigerant system, which has a relatively large difference in cooling capacity, can be reduced.

[0009] In the third embodiment, in the first or second embodiment, the first refrigerant flow path and the second refrigerant flow path may each 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, and the at least one circumferential flow path connects the plurality of axial flow paths in series.

[0010] A configuration can be considered in which the first refrigerant flow path and the second refrigerant flow path have a plurality of flow paths extending in the circumferential direction of the housing and at least one flow path extending in the axial direction. According to the above configuration, the first refrigerant flow path and the second refrigerant flow path can be easily formed compared to a configuration in which the 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.

[0011] In the fourth embodiment, in the third embodiment, the housing may comprise 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 in either the first cover or the second cover.

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

[0013] In the fifth embodiment, in the fourth embodiment, all of the plurality of axial channels may be provided at positions where they are equal in distance from the central axis of the cylindrical central housing. The at least one circumferential channel may have a first circumferential channel connecting two adjacent axial channels and a second circumferential channel connecting two axial channels located on both sides of the two adjacent axial channels.

[0014] According to the above configuration, a plurality of axial flow channels can be easily formed compared to a configuration in which each of the plurality of axial flow channels is provided at a different position in the diameter direction.

[0015] In the sixth embodiment, in the fourth or fifth embodiment, the first circumferential flow path in the first cover and the second cover may be at least partially adjacent to the second circumferential flow path in the radial direction.

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

[0017] In the seventh embodiment, in any one of the first to sixth embodiments, the second refrigerant system may comprise a third refrigerant path connecting the supply path and the discharge path, and a fourth refrigerant path connecting the supply path and the discharge path independently of the third refrigerant path.

[0018] According to the above configuration, pressure loss as a whole motor unit can be reduced. Therefore, the cooling capacity of the motor unit can be improved. Brief explanation of the drawing

[0019] The features, advantages, and technical and industrial significance of exemplary embodiments of the present invention are described below with reference to the accompanying drawings, in which similar reference numerals indicate similar elements. Figure 1 is a schematic diagram of a driving device (2). FIG. 2 is a rear view of the front cover (22) of the housing (12). FIG. 3 is a front view of the rear side cover (24) of the housing (12). Figure 4 is a schematic diagram of the refrigerant flow path within the housing (12). FIG. 5 is a schematic diagram of a refrigerant flow path for a first modified example. Specific details for implementing the invention

[0020] With reference to FIGS. 1 to 4, the drive device (2) will be described. The drive device (2) is mounted on an electric vehicle, etc. Also, the front-rear, left-right, and up-down directions in FIGS. 1 to 3 are used to make the explanation easier to understand and do not define the actual directions. Additionally, below, "clockwise" and "counterclockwise" directions are described based on the direction viewed from the rear of the drive device (2).

[0021] As shown in FIG. 1, the driving device (2) comprises 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) comprises a housing (12) and a motor (14).

[0022] The housing (12) comprises a central housing (20), a front side cover (22), and a rear side 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 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.

[0023] As shown in FIG. 2, the front cover (22) has a supply path (30) having a refrigerant supply port (30A), a discharge path (32) having a refrigerant discharge port (32A), a plurality of first inner paths (34A to 34F), and a plurality of first outer paths (36A to 36F). Additionally, in the following description, each of the plurality of first inner paths (34A to 34F) and the plurality of first outer paths (36A to 36F) may be collectively referred to as "first inner path (34)" and "first outer path (36)". The first inner path (34) is arranged along the circumferential direction. The first inner path (34) extends along the circumferential direction. At each of the two ends in the circumferential direction of the first inner channel (34), the front end of the axial channel (20A) of the central housing (20) is connected. That is, the first inner channel (34) connects two axial channels (20A) that are adjacent to each other in the circumferential direction.

[0024] The first outer channel (36) is arranged along the circumferential direction. The first outer channel (36) has a first connecting channel (38) and two first radial channels (40). Also, for ease of viewing, the symbols of the first connecting channel (38) and the two first radial channels (40) in the first outer channels (36B to 36F) are omitted. Each of the plurality of first outer channels (36A to 36F) corresponds to each of the plurality of first inner channels (34A to 34F). The first connecting channel (38) is provided radially outward from the first inner channel (34) and also extends along the circumferential direction. The clockwise end of the first connecting channel (38) is located clockwise from the clockwise end of the first inner channel (34). The counterclockwise end of the first connecting channel (38) is located counterclockwise from the counterclockwise end of the first inner channel (34). One of the two first radial channels (40) extends inward in the radial direction from the counterclockwise end of the first connecting channel (38), and the other extends inward in the radial direction from the clockwise end of the first connecting channel (38). In the radial direction, the position of the radially inner end of the two first radial channels (40) is the same as the position of the first inner channel (34). The axial channel (20A) of the central housing (20) is connected to the radially inner end of the two first radial channels (40). That is, the first outer channel (36) connects two axial channels (20A) located on both sides of two axial channels (20A) connected by the first inner channel (34).

[0025] The supply path (30) is provided in the central part of the first inner path (34A) and the first outer path (36A) in the circumferential direction. The supply path (30) is connected to the refrigerant supply port (30A), the first inner path (34A), and the first outer path (36A). The discharge path (32) is provided in the central part of the first inner path (34F) and the first outer path (36F) in the circumferential direction. The discharge path (32) is connected to the refrigerant discharge port (32A), the first inner path (34F), and the first outer path (36F).

[0026] As shown in FIG. 3, the rear side cover (24) is provided with a plurality of second inner channels (54A to 54F) and a plurality of second outer channels (56A to 56F). Additionally, in the following description, each of the plurality of second inner channels (54A to 54F) and the plurality of second outer channels (56A to 56F) may be collectively referred to as "second inner channels (54)" and "second outer channels (56)". The second inner channels (54) are arranged along the circumferential direction. The second inner channels (54) are extended along the circumferential direction. The rear end of the axial channel (20A) of the central housing (20) is connected to each of the two ends of the second inner channels (54) in the circumferential direction. That is, the second inner channels (54) connect two axial channels (20A) that are adjacent to each other in the circumferential direction.

[0027] The second outer channel (56) is arranged along the circumferential direction. The second outer channel (56) is provided with a second connecting channel (58) and two second radial channels (60). Also, for ease of viewing, the symbols of the second connecting channel (58) and the two second radial channels (60) of the second outer channels (56B to 56F) are 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 outward from the second inner channel (54) and also extends along the circumferential direction. The clockwise end of the second connecting channel (58) is located clockwise from the clockwise end of the second inner channel (54). The counterclockwise end of the second connecting channel (58) is located counterclockwise from the counterclockwise end of the second inner channel (54). One of the two second radial channels (60) extends inward in the radial direction from the counterclockwise end of the second connecting channel (58), and the other extends inward in the radial direction from the clockwise end of the second connecting channel (58). In the radial direction, the position of the radial inner end of the two second radial channels (60) is the same as the position of the second inner channel (54). The axial channel (20A) of the central housing (20) is connected to the radial inner end of the two second radial channels (60). That is, the second outer channel (56) connects two axial channels (20A) located on both sides of two axial channels (20A) connected by the second inner channel (54).

[0028] As shown in FIG. 1, the motor (14) extends along a central axis A. The motor (14) is housed within a housing (12). The motor (14) comprises a motor shaft (70), a rotor (72), and a stator (74). The motor shaft (70) extends along the direction of axis A. The motor shaft (70) is rotatably supported by bearings on the front cover (22) and the rear cover (24) of the housing (12). 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 means of a shrink fit or the like.

[0029] A high-voltage current flows through the coil (not shown) of the stator (74). Because of this, the stator (74) generates heat. To cool the stator (74), a coolant flows through the flow path inside the housing (12).

[0030] (Euro inside the housing (12))

[0031] With reference to FIGS. 2 to 4, the flow path within the housing (12) will be described. FIG. 4 is an unfolded view of the flow path within the housing (12). In FIG. 4, for ease of viewing, the left-right position of the first inner flow path (34) and the left-right position of the first connecting flow path (38) of the first outer flow path (36) are offset. In addition, the left-right position of the second inner flow path (54) and the left-right position of the second connecting flow path (58) of the second outer flow path (56) are also offset.

[0032] As shown in FIG. 4, the flow path within the housing (12) comprises 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 circumferential counterclockwise direction (upper side in FIG. 4). 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 circumferential clockwise direction (lower side in FIG. 4). The first length L1, which is the circumferential length of the first range R1, is longer than the second length L2, which is the circumferential length of the second range R2.

[0033] The first refrigerant system (80) is provided with 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 to 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 first refrigerant flow path (90) is shown as a thin arrow, and an 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 passage (90) is composed of a counterclockwise portion of the first outer passage (36A) of the front cover (22), a clockwise portion of the first outer passage (36B to 36E) and the first outer passage (36F) of the front cover (22), a second inner passage (54A to 54E) of the rear cover (24), and a plurality of axial passages (20A) connecting each passage of the front cover (22) and each passage of the rear cover (24). That is, the axial passages (20A) in the first refrigerant passage (90) are connected in series by the first outer passage (36) and the second inner passage (54). Additionally, the second refrigerant passage (92) is composed of a counterclockwise portion of the first inner passage (34A) of the front cover (22), a clockwise portion of the first inner passage (34B to 34E) and the first inner passage (34F) of the front cover (22), a second outer passage (56A to 56E) of the rear cover (24), and a plurality of axial passages (20A) connecting each passage of the front cover (22) and each passage of the rear cover (24). That is, the axial passages (20A) in the second refrigerant passage (92) are connected in series by the first inner passage (34) and the second outer passage (56). In the first range R1, the first refrigerant passage (90) and the second refrigerant passage (92) do not intersect. That is, the first refrigerant path (90) and the second refrigerant path (92) are independent paths.In the first range R1, the refrigerant flows in a meandering direction along axis A within the first refrigerant path (90) and the second refrigerant path (92).

[0034] The second refrigerant system (82) is provided with 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 to a supply flow path (30) and a discharge flow path (32). In FIG. 4, the arrow indicating the direction of refrigerant flow in the third refrigerant flow path (100) is shown as a thin arrow, and the arrow indicating the direction of refrigerant flow in the fourth refrigerant flow path (102) is shown as a thick arrow. The third refrigerant passage (100) is composed of a clockwise portion of the first outer passage (36A) of the front side cover (22), a counterclockwise portion of the first outer passage (36F), a second inner passage (54F) of the rear side cover (24), and a plurality of axial passages (20A) connecting each passage of the front side cover (22) and each passage of the rear side cover (24). That is, the axial passages (20A) in the third refrigerant passage (100) are connected in series by the first outer passage (36) and the second inner passage (54). Additionally, the fourth refrigerant passage (102) is composed of a portion on the clockwise side of the first inner passage (34A) of the front side cover (22), a portion on the counterclockwise side of the first inner passage (34F), a second outer passage (56F) of the rear side cover (24), and a plurality of axial passages (20A) connecting each passage of the front side cover (22) and each passage of the rear side cover (24). That is, the axial passages (20A) in the fourth refrigerant passage (102) are connected in series by the first inner passage (34) and the second outer passage (56). In the second range R2, the third refrigerant passage (100) and the fourth refrigerant passage (102) do not intersect. That is, the third refrigerant passage (100) and the fourth refrigerant passage (102) are independent passages. In the second range R2, the refrigerant flows meanderingly in the direction of axis A within the third refrigerant path (100) and the fourth refrigerant path (102).

[0035] As described above, as shown in FIGS. 1 and FIGS. 4, the motor unit (10) comprises a motor (14) extending along the direction of axis A, a housing (12) that accommodates the motor (14), and a flow path provided in the housing (12) and configured to allow refrigerant to flow in the circumferential direction (an example of the “circumferential direction”) of the housing (12). The flow path comprises a supply flow path (30) through which refrigerant is supplied, a discharge flow path (32) through which refrigerant is discharged and which is located at a different position in the circumferential direction from 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) has a first refrigerant path (90) connecting a supply path (30) and a discharge path (32), and a second refrigerant path (92) connecting a supply path (30) and a discharge path (32) independently of the first refrigerant path (90).

[0036] According to the above configuration, compared to a configuration in which the first refrigerant system (80) has only one independent refrigerant path, the pressure loss in the first refrigerant system (80) can be reduced. Because of this, the amount of refrigerant supplied to the first refrigerant system (80) can be increased. Therefore, in the first refrigerant system (80), the difference between the cooling capacity near the supply path (30) and the cooling capacity near the discharge path (32) can be reduced. As a result, the cooling performance of the motor unit (10) can be improved.

[0037] In addition, as shown in FIG. 4, the first length L1, which is the length in the circumferential direction of the first range R1, is longer than the second length L2, which is the length in the circumferential direction of the second range R2.

[0038] In the case where the first length L1 is longer than the second length L2, the difference between the cooling capacity near the supply path (30) and the cooling capacity near the discharge path (32) in the first refrigerant system (80) is greater than the difference between the cooling capacity near the supply path (30) and the cooling capacity near the discharge 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), which has a relatively large difference in cooling capacity, can be reduced.

[0039] Additionally, as shown in FIG. 4, the first refrigerant passage (90) and the second refrigerant passage (92) have a plurality of axial passages (20A) extending in the axial direction of the housing (12) and at least one circumferential passage extending in the circumferential direction (e.g., a first inner passage (34), a first outer passage (36), a second inner passage (54), and a second outer passage (56)). The plurality of axial passages (20A) in the first refrigerant passage (90) and the second refrigerant passage (92) are connected in series by at least one circumferential passage.

[0040] A configuration can be conceived 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. According to the above configuration, the first refrigerant flow path (90) and the second refrigerant flow path (92) can be easily formed compared to 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] Additionally, as shown in FIG. 1, the housing (12) comprises a cylindrical central housing (20), a front side cover (22) (an example of a "first cover") connected to the front end (an example of a "first end") in the axis A direction of the central housing (20), and a rear side cover (24) (an example of a "second cover") connected to the rear end (an example of a "other end") in the axis A direction of the central housing (20). 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 side cover (22) or the rear side cover (24).

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

[0043] Additionally, as shown in FIG. 2 and FIG. 3, all of the plurality of axial channels (20A) are provided at the same position in the diameter direction. That is, the plurality of axial channels (20A) are provided at positions that are equal in distance from the center axis of the cylindrical central housing. As shown in FIG. 4, at least one circumferential channel has a first inner channel (34) and a second inner channel (54) (an example of the "first circumferential channel") connecting two axial channels (20A) adjacent to each other, and a first outer channel (36) and a second outer channel (56) (an example of the "second circumferential channel") connecting two axial channels (20A) located on both sides of the two axial channels (20A).

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

[0045] Additionally, as shown in FIG. 4, in the front side cover (22) or rear side cover (24), the first inner flow path (34), the second inner flow path (54), and the first outer flow path (36) and the second outer flow path (56) are at least partially adjacent in the diameter direction.

[0046] According to the above configuration, a plurality of circumferential flow paths can be easily formed compared to 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.

[0047] Additionally, as shown in FIG. 4, the second refrigerant system (82) has a third refrigerant path (100) connecting the supply path (30) and the discharge path (32), and a fourth refrigerant path (102) connecting the supply path (30) and the discharge path (32) independently of the third refrigerant path (100).

[0048] According to the above configuration, pressure loss as a whole of the motor unit (10) can be reduced. Therefore, the cooling capacity of the motor unit (10) can be improved.

[0049] Although specific embodiments of the technology disclosed in this specification have been described in detail above, they are merely examples and do not limit the scope of the patent claims. The technology described in the patent claims includes various modifications and alterations of the specific embodiments exemplified above.

[0050] First variant

[0051] As shown in FIG. 5, the second refrigerant system (182) may have only one refrigerant flow path (200). In this modified example, the first outer flow path (36A) of the front side cover (22) does not have a first radial flow path (40) in the clockwise direction, and the first outer flow path (36F) of the front side cover (22) does not have a first radial flow path (40) in the clockwise direction. Additionally, the rear side cover (24) does not have a second outer flow path (56F). With this configuration, the amount of refrigerant supplied to the first refrigerant system (80) can be increased compared to a configuration in which the first refrigerant system and the second refrigerant system each have only one flow path. For this reason, the difference between the cooling capacity near the supply path (30) of the first refrigerant system (80) and the cooling capacity near the discharge path (32) of the first refrigerant system (80) can be reduced. Additionally, 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.

[0052] Second variant

[0053] The first length L1 of the first range R1 and the second length L2 of the second range R2 may be the same.

[0054] Third variant

[0055] 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.

[0056] 4th variant

[0057] The first outer channel (36) does not have to have two first radial channels (40). Also, the second outer channel (56) does not have to have two second radial channels (60). In this modified example, the axial channel (20A) of the central housing (20) is inclined with respect to the axis A direction.

[0058] Fifth variant

[0059] The front side cover (22) may not be provided with a first outer flow path (36A). In this modified example, a first inner flow path (34A) is extended between the circumferential positions of the first diameter flow path (40) at both ends of the first outer flow path (36A).

[0060] 6th variant

[0061] The first refrigerant path (90) and the second refrigerant path (92) may be paths that meander in the circumferential direction.

[0062] Furthermore, the technical elements described in this specification or 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. Additionally, the technology exemplified in this specification or drawings can achieve multiple objectives simultaneously, and achieving one of those objectives possesses technical utility in itself.

Claims

Claim 1 A motor unit (10) and a motor (14) extending along a central axis; a housing (12) housing the motor (14); and a flow path provided in the housing (12) and configured to allow refrigerant to flow in the circumferential direction of the housing (12), wherein the flow path includes a supply flow path (30) through which the refrigerant is supplied, a discharge flow path (32) through which the refrigerant is discharged and which is provided at a position different from the supply flow path (30) in the circumferential direction, a first refrigerant system (80) provided in a first range extending from the supply flow path (30) toward one side of the circumferential direction to the discharge flow path (32), and a second refrigerant system (82) provided in a second range extending from the supply flow path (30) toward the other side of the circumferential direction to the discharge flow path (32), wherein the first refrigerant system (80) connects the supply flow path (30) and the discharge flow path (32). The apparatus comprises a first refrigerant passage (90) and a second refrigerant passage (92) that connects the supply passage (30) and the discharge passage (32) independently of the first refrigerant passage (90); the first refrigerant passage (90) and the second refrigerant passage (92) each comprise a plurality of axial passages (20A) extending in the axial direction of the housing (12) and at least one circumferential passage (34, 36, 54, 56) extending in the circumferential direction; the at least one circumferential passage (34, 36, 54, 56) connects the plurality of axial passages (20A) in series; and the housing (12) comprises a cylindrical central housing (20), a first cover (22) connected to one end of the central housing (20) in the axial direction, and a second cover (24) connected to the other end of the central housing (20) in the axial direction. Including, the plurality of axial flow paths (20A) are provided in the central housing (20), and each of the at least one circumferential flow path (34, 36, 54, 56) is provided in either the first cover (22) or the second cover (24).All of the plurality of axial flow paths (20A) are provided at positions with equal distances from the central axis of the cylindrical central housing, and at least one circumferential flow path (34, 36, 54, 56) has a first circumferential flow path (34, 54) connecting two axial flow paths (20A) adjacent to each other, and a second circumferential flow path (36, 56) connecting two axial flow paths (20A) located on both sides of the two axial flow paths (20A) adjacent to each other, a motor unit (10). Claim 2 In claim 1, the first length, which is the length along the circumferential direction of the first range, is longer than the second length, which is the length along the circumferential direction of the second range, in the motor unit (10). Claim 3 delete Claim 4 delete Claim 5 delete Claim 6 In claim 1, the first cover (22) and the second cover (24) have a first circumferential flow path (34, 54) that is at least partially adjacent in the radial direction to the second circumferential flow path (36, 56), a motor unit (10). Claim 7 In claim 1, the second refrigerant system (82) comprises a third refrigerant path (100) connecting the supply path (30) and the discharge path (32), and a fourth refrigerant path (102) connecting the supply path (30) and the discharge path (32) independently of the third refrigerant path (100), in a motor unit (10).

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