Rotary electric machine assembly

Abstract

To provide a housing structure of a rotary electric machine, which can miniaturize a size of a housing while a water passage which cools a stator is integrated in the housing.SOLUTION: A rotary electric machine assembly includes: a rotary electric machine including a rotor, a stator having a coil, and a bus bar arranged protruding radially outward from an outer periphery of the coil of the stator; and a housing which accommodates the rotary electric machine. The housing includes: a first housing part in a bottomed cylindrical shape, in which one axial side of the rotary electric machine is opened; and a second housing part attached to one axial side of the first housing part. The first housing part includes inside a water passage which extends in a circumferential direction and whose one axial side is opened. The second housing part has a cylindrical step part which seals an opening of the water passage and can store the bus bar, on an inner peripheral side.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a rotating electrical machine assembly. [Background technology]

[0002] In order to efficiently cool the coils of the stator in a rotating electric machine, various housing structures have been proposed in which a cooling water flow path is provided in the housing along the outer periphery of the stator, and the stator of the rotating electric machine is water-cooled from the outer periphery side. As an example, Patent Document 1 discloses a rotating electric machine having a water channel opening on the end face of the housing on the anti-load side. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-19494 A Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, in order to avoid interference between the sealing portion of the water passage of the housing and the wiring portion of the rotating electric machine, the wiring portion is drawn out in the axial direction and arranged. Therefore, there is room for improvement in that the housing of the rotating electric machine becomes larger.

[0005] The present invention has been made in consideration of the above circumstances, and provides a rotating electrical machine assembly that enables the size of the housing to be reduced while incorporating a water passage for cooling the stator in the housing. [Means for solving the problem]

[0006] A rotating electric machine assembly according to one embodiment includes a rotating electric machine including a rotor, a stator having a coil, and a bus bar arranged to protrude radially outward from the outer periphery of the coil of the stator, and a housing that houses the rotating electric machine. The housing has a first housing part that is cylindrical with a bottom and has one axial side open to the rotating electric machine, and a second housing part that is attached to one axial side of the first housing part. The first housing part has a water passage therein that extends in the circumferential direction and is open to one axial side. The second housing part has a cylindrical step part on its inner periphery that seals the opening of the water passage and is capable of housing the bus bar.

[0007] In the above aspect, the bus bar may be accommodated within the second housing portion, protruding radially outward beyond an inner periphery of the first housing portion. In the above aspect, the bus bar and the water channel may be disposed in a position where they overlap when projected in the axial direction. In the above aspect, the housing may further include a third housing portion attached to one axial side of the second housing portion so as to cover the bus bar. Effect of the Invention

[0008] According to one aspect, it is possible to provide a housing structure for a rotating electric machine that can reduce the size of the housing while incorporating a water passage for cooling a stator in the housing. [Brief description of the drawings]

[0009] [Figure 1] 1 is a vertical cross-sectional view showing an example of a rotating electric machine assembly according to an embodiment of the present invention; [Diagram 2] 4 is a view of a first housing portion of the rotating electrical machine assembly as viewed from the anti-load side. FIG. [Diagram 3] 13 is a view of the rotating electrical machine assembly with the third housing unit removed, as viewed from the anti-load side. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the embodiments, in order to make the description easier to understand, structures and elements other than the main parts of the present invention will be described in a simplified or omitted manner. In addition, in the drawings, the same elements are given the same reference numerals. Note that the shapes, dimensions, etc. of each element shown in the drawings are shown only for illustrative purposes, and do not represent the actual shapes, dimensions, etc.

[0011] In the following description, the direction parallel to the extension direction of the rotation axis Ax is referred to as the axial direction, the circumferential direction centered on the rotation axis Ax is simply referred to as the circumferential direction, and the radial direction centered on the rotation axis Ax is simply referred to as the radial direction. In the following description, "extending in the axial direction" includes not only the case of extending strictly in the axial direction, but also the case of extending in a direction tilted by less than 45° with respect to the axial direction. In addition, "extending in the radial direction" includes not only the case of extending strictly in the radial direction, i.e., in a direction perpendicular to the axial direction, but also the case of extending in a direction tilted by less than 45° with respect to the radial direction. In addition, "parallel" includes not only the case of being strictly parallel, but also the case of being tilted by an angle of less than 45° with respect to each other.

[0012] Fig. 1 is a vertical cross-sectional view showing an example of a rotating electric machine assembly in this embodiment. Fig. 2 is a view of a first housing part of the rotating electric machine assembly seen from the anti-load side. Fig. 3 is a view of the rotating electric machine assembly with a third housing part removed seen from the anti-load side.

[0013] 1, the rotating electric machine assembly of this embodiment includes a rotating electric machine 1 and a housing 2. The rotating electric machine 1 is, for example, an inner rotor type motor for an electric vehicle, and has a rotor 3, a shaft 4, and a stator 5.

[0014] A shaft 4 is fitted into the rotor 3 along the rotation axis Ax, and the rotor 3 is supported so as to be rotatable about the shaft 4. The rotor 3 may be, for example, an embedded magnet type rotor, a surface magnet type rotor, a squirrel-cage type rotor, a wound type rotor, or the like. A stator 5 is disposed concentrically around the outer periphery of the rotor 3 with a slight air gap between them. U-phase, V-phase, and W-phase coils 6 are wound around the stator 5 with the phases shifted in the circumferential direction.

[0015] A bus bar 7 for supplying power to the coils 6 of each phase is disposed on the anti-load side of the stator 5. The bus bar 7 is disposed at the outer periphery of the coil end on the anti-load side, protruding radially outward from the outer periphery of the stator 5. As shown in FIG. 3, the bus bar 7 extends in an arc shape along the circumferential direction of the coils 6.

[0016] In the rotating electric machine 1, the magnetic field of the stator 5 is switched in sequence by controlling the current of the coils 6 of each phase, thereby forming a rotating magnetic field in the stator 5. Then, the rotor 3 and the shaft 4 rotate about the rotation axis Ax due to the attractive or repulsive force with the magnetic field of the rotor 3.

[0017] The housing 2 is a cylindrical casting with a bottom, and is configured by combining a first housing section 11, a second housing section 12, and a third housing section .

[0018] The first housing 11 has an overall shape of a cylinder with a bottom. The first housing 11 has a cylindrical portion 11a that houses the rotating electric machine 1 and a bottom surface portion 11b that closes the other axial side (load side) of the cylindrical portion 11a, and the cylindrical portion 11a and the bottom surface portion 11b are integrally formed. The inner diameter of the cylindrical portion 11a is set to a dimension corresponding to the outer diameter of the stator 5 of the rotating electric machine 1, and the axial length of the cylindrical portion 11a is set to a dimension capable of housing the stator 5 of the rotating electric machine 1 and the coil end on the load side.

[0019] The cylindrical portion 11a is open on one axial side (anti-load side). A hole 11c for inserting the shaft 4 is formed in the center of the bottom surface 11b of the first housing portion 11. A bearing 8a is disposed inside the hole 11c.

[0020] As shown in Fig. 1, the rotating electric machine 1 is accommodated in the internal space of the first housing portion 11 from the opening on the other side. The stator 5 of the rotating electric machine 1 is fixed to the inner circumference of the cylindrical portion 11a by, for example, shrink fitting. When the rotating electric machine 1 is accommodated in the first housing portion 11, the load side of the shaft 4 protrudes to the outside of the first housing portion 11 from a hole 11c in the bottom surface portion 11b, and is journaled to the first housing portion 11 via a bearing 8a. The load side of the shaft 4 is connected to, for example, a reducer (not shown).

[0021] 2, a belt-shaped water passage 14 through which cooling water flows in the circumferential direction is arranged in a ring shape inside the cylindrical portion 11a of the first housing portion 11. The belt-shaped water passage 14 is divided into four in the circumferential direction by partition walls 15 extending in the axial direction, and each belt-shaped water passage 14 has an arc shape when viewed in the axial direction and extends in the axial direction as shown in FIG. 1. Each belt-shaped water passage 14 has an open end on one axial side and communicates with the outside of the housing 2.

[0022] Each of the band-shaped water passages 14 is partially connected to adjacent band-shaped water passages 14 in the circumferential direction, so that cooling water flows in the circumferential direction through the multiple band-shaped water passages 14 in the first housing part 11. The cooling water is circulated by a pump (not shown) through an inlet and an outlet (not shown) provided on the side surface of the cylindrical part 11a, for example. As a result, the stator 5 housed in the first housing part 11 is cooled from the outside by the cooling water flowing through the band-shaped water passages 14.

[0023] Further, a plurality of screw receiving portions 16 for connecting with the second housing portion 12 and the third housing portion 13 are formed on the outer periphery of one axial side of the first housing portion 11. Each screw receiving portion 16 is formed protruding from the cylindrical portion 11a of the first housing portion 11 toward the outer periphery, and a screw hole 16a is opened in the axial direction in each screw receiving portion 16. The screw receiving portions 16 are formed at predetermined intervals on the outer periphery of the first housing portion 11, and are arranged so that their circumferential positions correspond to those of the partition walls 15 that separate the belt-shaped water passage 14, for example.

[0024] The second housing part 12 is attached to one axial side of the cylindrical part 11a of the first housing part 11. The second housing part 12 is formed in a shape having a cylindrical step part on the inner peripheral side, and has a first part 21 facing the other axial side and a second part 22 facing the one axial side. In addition, the second housing part 12 has a screw receiving part 23 at a position corresponding to the screw receiving part 16 of the first housing part 11, into which a bolt 26 described later can be inserted.

[0025] The first portion 21 of the second housing portion 12 is formed in a flange shape that protrudes annularly toward the inner periphery so as to correspond to the end face of the cylindrical portion 11a of the first housing portion 11. When the housing 2 is assembled, the first portion 21 of the second housing portion 12 covers the end face of the cylindrical portion 11a of the first housing portion 11 and closes the opening of the band-shaped water passage 14 provided in the cylindrical portion 11a. In addition, a seal material 24 is disposed around the band-shaped water passage 14 between the cylindrical portion 11a of the first housing portion 11 and the first portion 21 of the second housing portion 12, and the band-shaped water passage 14 is watertightly sealed.

[0026] The second section 22 of the second housing section 12 is formed integrally with the first section 21. The second section 22 is formed in a thin-walled cylindrical shape that protrudes from the outer periphery of the first section 21 to one side in the axial direction. The internal space of the second section 22 has an inner diameter larger than the inner periphery of the first housing section 11, and can accommodate the anti-load side coil end and the bus bar 7 protruding radially outward. When projected in the axial direction, the band-shaped water channel 14 of the first housing section 11 is located at a position that overlaps with the bus bar 7.

[0027] The third housing part 13 is attached to one axial side of the second housing part 12 so as to close the opening of the second housing part 12. The third housing part 13 accommodates a resolver (not shown) that detects the rotation angle of the shaft 4, an inverter (not shown) that controls the rotating electric machine 1, and the like.

[0028] Further, a hole 13a is formed in the third housing portion 13 at a position corresponding to the shaft 4. A bearing 8b that supports the anti-load side of the shaft 4 is disposed inside the hole 13a. Furthermore, the third housing portion 13 has a screw receiving portion 25 at a position corresponding to the screw receiving portion 16 of the first housing portion 11, through which a bolt 26 described below can be inserted.

[0029] Here, when assembling the rotating electric machine assembly, first, the second housing part 12 is attached to the first housing part 11 with the seal material 24 sandwiched therebetween to close the opening of the band-shaped water passage 14. Next, the rotating electric machine 1 is inserted into the first housing part 11 from one axial side of the second housing part 12, and the stator 5 is fixed to the cylindrical part 11a of the first housing part 11. As a result, the rotating electric machine 1 is accommodated in the first housing part 11 with the band-shaped water passage 14 positioned on the outer periphery of the stator 5. Also, the bus bar 7 that protrudes radially outward from the inner periphery of the first housing part 11 is accommodated inside the second housing part 12.

[0030] Thereafter, the third housing part 13 is attached to one axial side of the second housing part 12 so as to cover the busbar 7 and the rotating electric machine 1, and the bolts 26 are inserted into the respective screw receiving parts 16, 23, 25 of the first housing part 11, the second housing part 12 and the third housing part 13 to screw the housing 2 in place. Through the above procedure, a rotating electric machine assembly is formed.

[0031] In the rotating electric machine assembly of this embodiment, the first housing part 11 is provided with the band-shaped water passage 14 for cooling the stator 5, and the second housing part 12 on the anti-load side serves both as a lid for sealing the opening of the band-shaped water passage 14 and as a member for securing storage space for the bus bar 7. As a result, it is not necessary to arrange the bus bar 7 overlapping on the anti-load side in the axial direction of the coil 6, so that the rotating electric machine 1 can be arranged efficiently within the housing 2 and the axial size of the rotating electric machine assembly can be reduced.

[0032] In addition, in this embodiment, since the opening of the band-shaped water passage 14 is provided on the anti-load side of the first housing part 11, there is no need to place a part for sealing the band-shaped water passage or a dividing surface of the housing on the load side of the first housing part 11. Therefore, with the configuration of this embodiment, it is possible to improve the rigidity against deformation such as twisting and bending on the load side of the first housing part 11, and it also becomes easy to place a mount part for attaching a counterpart part on the load side of the first housing part 11.

[0033] The present invention is not limited to the above-described embodiment, and various improvements and design changes may be made without departing from the spirit of the present invention.

[0034] For example, in the above embodiment, the rotating electric machine is a motor, but the rotating electric machine may be a generator. Also, the housing structure of the above embodiment is not limited to use in electric vehicles, but may be applied to rotating electric machines for other purposes.

[0035] In addition, the embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0036] Reference Signs List 1... rotating machine, 2... housing, 3... rotor, 4... shaft, 5... stator, 6... coil, 7... bus bar, 8a, 8b... bearing, 11... first housing part, 11a... cylindrical part, 11b... bottom part, 11c... hole, 12... second housing part, 13... third housing part, 13a... hole, 14... band-shaped water channel, 15... bulkhead, 16... screw receiving part, 16a... screw hole, 21... first part, 22... second part, 23... screw receiving part, 24... sealing material, 25... screw receiving part, 26... bolt

Claims

1. a rotating electric machine including a rotor, a stator having a coil, and a bus bar arranged to protrude radially outward from an outer periphery of the coil of the stator; a housing that houses the rotating electric machine, the housing includes a first housing portion having a bottomed cylindrical shape and opening at one axial side of the rotating electric machine, and a second housing portion attached to the one axial side of the first housing portion, The first housing portion has a water passage therein that extends in a circumferential direction and is open on one axial side, The second housing portion has a cylindrical stepped portion on an inner periphery side, the stepped portion sealing an opening of the water channel and capable of accommodating the bus bar. Rotating electric machine assembly.

2. The bus bar protrudes radially outward beyond the inner periphery of the first housing portion and is accommodated within the second housing portion.

2. The rotating electrical machine assembly according to claim 1.

3. The bus bar and the water channel are arranged in a position where they overlap when projected in the axial direction.

2. The rotating electrical machine assembly according to claim 1.

4. The housing further includes a third housing portion attached to one axial side of the second housing portion so as to cover the bus bar. The rotating electrical machine assembly according to any one of claims 1 to 3.

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