Motor case and motor

Abstract

To achieve both miniaturization of the motor case and efficient and uniform cooling of the stator in a motor case capable of cooling the stator. [Solution] A motor case that holds a motor having a shaft extending horizontally, a rotor that follows the shaft, a stator core that rotatably holds the rotor, and a stator coil that protrudes from the stator core, the motor case being a cylindrical member that extends along the axial direction above the stator coil and reaches above the coil end, and is equipped with a refrigerant flow path that is positioned at a position displaced by a predetermined angle around the axis from a straight line extending upward from the axis, a protrusion that extends from a region corresponding to the end of the refrigerant flow path in a region directly above the axis above the stator coil, to a position radially inward beyond the outer peripheral surface of the stator core, and a discharge hole that penetrates inward and outward through a region of the end of the refrigerant flow path that faces the protrusion.

Description

[Technical Field]

[0001] The present disclosure relates to a motor case and a motor. [Background technology]

[0002] Conventionally, a motor case that holds a motor body having a structure in which a rotor that rotates in response to the rotation of a shaft extending horizontally is surrounded by a cylindrical stator has been known, and that is configured to be able to cool the stator.

[0003] Specifically, the refrigerant flow path extending in the axial direction of the shaft above the stator reaches above the coil ends of the stator coil, from which the refrigerant drips toward the coil ends (see Patent Document 1). In this configuration, the refrigerant flow path is positioned directly above the axis in a plan view intersecting with the axis, thereby enabling the refrigerant to drip to the apex of the coil end. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2021-129339 Summary of the Invention [Problem to be solved by the invention]

[0005] However, with this configuration, the vertical size of the motor case tends to increase by the amount of the refrigerant flow path because the refrigerant flow path is located directly above the axis. While the vertical size can be reduced by shifting the refrigerant flow path downward from a position directly above the axis, in this case, the refrigerant dripping to a position off the apex of the coil end tends to drip in only one direction around the axis, making it impossible to efficiently and uniformly cool the stator. Thus, with this configuration, there was a problem in that it was not possible to achieve both a compact motor case and efficient and uniform cooling of the stator.

[0006] The present disclosure has been made to solve such problems, and its purpose is to provide a motor case capable of cooling a stator that achieves both compactness as a motor case and efficient and uniform cooling of the stator. [Means for solving the problem]

[0007] The motor case according to the present disclosure is a motor case capable of holding a motor having a shaft extending along a horizontal direction, a rotor driven by the rotation of the shaft, a cylindrical stator core rotatably holding the rotor, and a stator coil having an end protruding from the stator core when viewed in the axial direction, which is a perspective from the axial direction of the shaft, and in which, when the motor is held, the stator core is a cylindrical member that extends along the axial direction above the stator coil, with at least one end reaching above a coil end of the stator coil, and intersects with the axis. a refrigerant flow path that is disposed at a position displaced by a predetermined angle around the axis with respect to a straight line extending upward from the axis in a plan view; a protrusion that extends from a region that corresponds to at least one end of the refrigerant flow path in a region above the stator coil and directly above the axis when the motor is held, to a position radially inward of the outer peripheral surface of the stator core in the plan view; and a discharge hole that penetrates a region that faces the protrusion in at least one end of the refrigerant flow path from inside to outside, and discharges the refrigerant flowing through the end toward the protrusion. [Effects of the Invention]

[0008] In the motor case of the present disclosure, the coolant flow passage is positioned at a predetermined angle around the axis, and the coolant is discharged from this position toward a protrusion positioned directly above the axis, thereby allowing the coolant to drip to the apex of the coil end. By shifting the coolant flow passage by a predetermined angle around the axis, the coolant flow passage can be positioned downward according to this angle, thereby achieving both a compact motor case and efficient and uniform cooling of the stator.

[0009] Furthermore, in the motor case of the present disclosure, the protrusion extends to a position radially inward from the outer peripheral surface of the stator core and is close to the outer peripheral surface of the coil end, so that the refrigerant discharged from the discharge hole can be effectively guided along the outer peripheral surface of the protrusion onto the coil end. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a front view of a motor and a motor case according to an embodiment of the present disclosure; [Figure 2] 1 is a cross-sectional side view of a motor and a motor case according to an embodiment of the present disclosure (viewed along the arrows A-A in FIG. 1 ). [Figure 3] 1A is a front cross-sectional view (viewed along the arrow BB in FIG. 2) of a motor according to an embodiment of the present disclosure, and FIG. 1B is a front cross-sectional view of a main part thereof. [Figure 4] FIG. 1 is a plan view of a motor case according to an embodiment of the present disclosure; [Figure 5] 1 is a side cross-sectional view of a main portion of a motor and a motor case according to an embodiment of the present disclosure; [Figure 6] 6(a) is a plan view of a motor and a motor case according to another embodiment of the present disclosure, and FIG. 6(a) is a front cross-sectional view of a main part (viewed in the direction of arrow CC in FIG. 6(a)). [Figure 7] 10 is a side cross-sectional view of a motor and a motor case according to another embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings.

[0012] (1) Overall structure 1 and 2, the motor case 1 can hold a motor 100 including a shaft 110 extending horizontally, a rotor 120 that rotates as the shaft 110 rotates, and a cylindrical stator 130 that surrounds the rotor 120 around an axis 111 of the shaft 110. In this motor 100, the stator 130 includes a cylindrical stator core 133 that rotatably holds the rotor 120, and a stator coil 131 whose end (coil end 131e) protrudes from the stator core 133 when viewed in the axial direction, that is, from the direction of the axis 111. The motor 100 in this embodiment is mounted on electric vehicles and hybrid vehicles (including plug-in hybrid vehicles (PHEVs) that allow external charging and external power supply), etc.

[0013] This motor case 1 includes a case body 10 that surrounds the motor 100 around the axis 111 when the motor 100 is held therein, a pair of refrigerant flow paths 20 that extend above the stator coil 131 along the axis 111 of the shaft 110, a protrusion 30 that extends downward from a region directly above the axis 111, a pair of bearings 40 that rotatably hold each end of the shaft 110, and a distribution path 50 that distributes refrigerant supplied from outside to each of the refrigerant flow paths 20.

[0014] The case body 10 includes a cylindrical body 11 that surrounds the motor 100 around an axis 111, and a pair of lids 13 that close the ends of the cylindrical body 11. A bearing 40 is attached to the inside of each of the lids 13. A discharge hole (not shown) for discharging the refrigerant is formed in the lower region of the cylindrical body 11.

[0015] 3, in a plan view intersecting with the axis 111, the refrigerant flow path 20 is disposed at a first position displaced by a predetermined angle θ1 in a first direction (clockwise in FIG. 3(b)) about the axis 111 with respect to a straight line 113 extending upward from the axis 111, and at a second position displaced by a predetermined angle θ2 in a second direction (counterclockwise in FIG. 3(b)) opposite to the first direction. Note that, here, the angle θ1 at the first position and the angle θ2 at the second position are set to be the same angle, but these angles may be different.

[0016] The refrigerant flow path 20 is a cylindrical member with at least one end 21 reaching a region above the coil end 131e of the stator coil 131 in the stator 130, and the refrigerant flows through the inside of the refrigerant flow path 20. In this embodiment, both end portions 21 reach a region above the coil end 131e.

[0017] 3(b), a discharge hole 60 is formed in at least one end 21 of the refrigerant flow path 20, penetrating the area facing the protrusion 30 from inside to outside. This discharge hole 60 discharges the refrigerant flowing through the end 21 toward the protrusion 30. In this embodiment, the discharge holes 60 are formed in both end portions 21.

[0018] Furthermore, an auxiliary discharge hole 70 is formed in the end portion 21 of the refrigerant flow path 20, at which the discharge hole 60 is formed, and penetrates the area below the end portion 21 from inside to outside. The auxiliary discharge hole 70 is provided at a position above the coil end 131e so that the refrigerant flowing through the end portion 21 can be discharged downward toward the coil end 131e.

[0019] In this embodiment, the discharge hole 60 and the auxiliary discharge hole 70 are formed as holes so that the discharge rate of the refrigerant discharged from one end 21 of the refrigerant flow path 20 is equal to the discharge rate of the refrigerant discharged from the other end 21 within a predetermined tolerance range. Specifically, the total cross-sectional area of ​​the discharge hole 60 and the auxiliary discharge hole 70 formed at one end 21 is equal to the total cross-sectional area of ​​the discharge hole 60 and the auxiliary discharge hole 70 formed at the other end 21 within a predetermined tolerance range, thereby making the discharge rates from each equal.

[0020] The protrusions 30 extend in a rod shape from a region above the coil end 131e of the stator coil 131 and directly above the axis 111, which region corresponds to at least one end 21 of the refrigerant flow path 20, to a position radially inward beyond the outer circumferential surface of the stator core 133 of the stator 130 in a plan view intersecting the axis 111. In this embodiment, the protrusions 30 extend downward from the inner wall of the cover 13 that surrounds the motor 100.

[0021] As shown in FIG. 4, the distribution path 50 is a cylindrical member that connects the refrigerant flow paths 20 at intermediate positions in the direction of the axis 111, and has an inlet 51 for the refrigerant supplied from the outside.

[0022] (2) Effects In the motor case 1 of the above embodiment, the refrigerant flow path 20 is positioned at a position displaced by predetermined angles θ1 and θ2 around the axis 111, and the refrigerant is discharged from this position toward the protrusion 30 positioned directly above the axis 111, thereby allowing the refrigerant to drip to the apex of the coil end 131e (see the arrow in FIG. 3(b)). In this way, by displacing the refrigerant flow path 20 by a predetermined angle around the axis 111, the refrigerant flow path 20 can be positioned downward according to this angle, thereby achieving both a compact motor case 1 and efficient and uniform cooling of the stator 130.

[0023] Furthermore, in the motor case 1 of this embodiment, the protrusion 30 extends radially inward from the position that becomes the outer peripheral surface of the stator core 133 and is close to the outer peripheral surface of the coil end 131e, so that the refrigerant discharged from the discharge hole 60 can be effectively guided along the outer peripheral surface of the protrusion 30 onto the coil end 131e.

[0024] Furthermore, in the motor case 1 of the above embodiment, the stator 130 can be effectively cooled from two directions by the coolant flow paths 20 arranged at the first position and the second position.

[0025] Furthermore, in the motor case 1 of the above embodiment, the coil ends 131e located at both ends of the stator 130 can be effectively cooled by the refrigerant discharged from the ends 21 of the refrigerant flow passages 20, respectively.

[0026] Furthermore, in the motor case 1 of the above embodiment, the amount of refrigerant discharged from each end 21 of the refrigerant flow path 20 is made equal, so that the stator 130 can be cooled more uniformly.

[0027] (3) Variations Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above embodiments, and various modifications are possible without departing from the spirit of the invention. In particular, the multiple modifications described in this specification can be combined as needed.

[0028] 5, the protrusion 30 may be configured with an extension piece 31 that extends downward from its lower end along the end surface of the coil end 131e, at a position spaced apart outward in the direction of the axis 111 from the end surface of the coil end 131e of the motor 100 held in the motor case 1. With this configuration, the extension piece 31 of the protrusion 30 makes it easier for the refrigerant to drip along the end surface of the coil end 131e, thereby more effectively cooling the stator 130.

[0029] In the above embodiment, the protrusions 30 extend in a rod-like shape. However, it goes without saying that the protrusions 30 may have any shape other than a rod-like shape, such as a columnar or plate-like shape, which contributes to the downward dripping of the refrigerant.

[0030] In the above embodiment, the configuration for causing the refrigerant to drip onto the coil end 131e is exemplified by a configuration in which a single protrusion 30 is provided on the coil end 131e and the refrigerant is discharged from the discharge hole 60 of the refrigerant flow path 20 toward the protrusion 30. However, the configuration for causing the refrigerant to drip onto the coil end 131e may be configured by providing multiple protrusions 30. As a more specific example, as shown in FIG. 6, a configuration may be provided in which a pair of auxiliary protrusions 80 are positioned adjacent to the protrusion 30 and auxiliary discharge holes 90 are provided for discharging the refrigerant from the refrigerant flow path 20 toward the auxiliary protrusions 80.

[0031] In the above embodiment, the case body 10 is exemplified as being configured with the cylindrical body 11 and a pair of lid bodies 13. However, as shown in Fig. 7, the case body 10 may be configured to include a cylindrical body 11 that surrounds the motor 100 around the axis 111 and closes one end side in the direction of the axis 111, and a lid body 13 that closes the end side of the cylindrical body 11 that is not closed. [Explanation of symbols]

[0032] 1...motor case, 10...case body, 11...cylindrical body, 13...lid body, 20...refrigerant flow path, 21...end, 30...projection portion, 31...extension piece, 40...bearing, 50...distribution path, 51...inlet, 60...discharge hole, 70...auxiliary discharge hole, 80...auxiliary projection portion, 90...auxiliary discharge hole, 100...motor, 110...shaft, 111...axis, 120...rotor, 130...stator, 131...stator coil, 131e...coil end, 133...stator core

Claims

1. a motor case capable of holding a motor having a shaft extending along a horizontal direction, a rotor driven by rotation of the shaft, a cylindrical stator core rotatably holding the rotor, and a stator coil having an end protruding from the stator core when viewed in the axial direction, which is a perspective from the axial direction of the shaft; a refrigerant flow path which, when the motor is held, is a cylindrical member that extends along the axial direction above the stator coil, with at least one end reaching above a coil end of the stator coil, and is disposed at a position displaced by a predetermined angle around the axis with respect to a straight line extending upward from the axis when viewed in a plane intersecting the axis; a protrusion extending from a region corresponding to at least one end of the refrigerant flow path in a region immediately above the axis above the stator coil when the motor is held, to a position radially inward beyond an outer peripheral surface of the stator core in the plan view; a discharge hole that penetrates an area of ​​at least one end of the refrigerant flow path facing the protrusion from inside to outside and discharges the refrigerant flowing through the end toward the protrusion, Motor case.

2. The refrigerant flow path is disposed at a first position displaced by a predetermined angle in a first direction around the axis with respect to a straight line extending upward from the axis, and at a second position displaced by a predetermined angle in a second direction opposite to the first direction, in the plan view. The motor case according to claim 1 .

3. The coolant flow path has both ends that reach above the coil ends when the motor is held. The motor case according to claim 1 .

4. The discharge hole is formed as a hole such that the discharge amount of the refrigerant discharged from one end of the refrigerant flow path is equal to the discharge amount of the refrigerant discharged from the other end thereof within a predetermined error range. The motor case according to claim 3 .

5. a distribution path that distributes and supplies the refrigerant to the refrigerant flow path disposed at the first position and the refrigerant flow path disposed at the second position, The motor case according to claim 2 .

6. The protrusion includes an extension piece extending downward from a lower end side along the end surface of the coil end in a position spaced apart from the end surface of the coil end outward in the axial direction. The motor case according to any one of claims 1 to 5.

7. A motor held in the motor case according to claim 1.

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