JP6551060B2 - Rotating electric machine cooling structure - Google Patents

Description

  The present invention relates to a rotating electrical machine cooling structure and a manufacturing method thereof.

2. Description of the Related Art Conventionally, in order to reduce the size and increase the output of a rotating electrical machine, a structure is known in which a cooling medium is introduced into the rotating electrical machine to efficiently cool high temperature components (see, for example, Patent Document 1).
In this prior art, the housing of the rotary electric machine is provided with a cooling water channel and a water channel inlet and a water channel outlet connected to the cooling water channel, and the water channel inlet and water channel outlet respectively supply external refrigerant through connecting members such as hoses. Connected to the source.
Therefore, after the refrigerant supplied from the refrigerant supply source to the inlet of the water passage exchanges heat through the cooling water passage in the housing, the refrigerant is repeatedly circulated from the outlet of the water passage back to the refrigerant supply source.

Unexamined-Japanese-Patent No. 2015-19494

By the way, when the above-described conventional technique is applied to a hybrid vehicle having a configuration including a plurality of rotating electrical machines, the rotating electrical machines are arranged in parallel and cooled independently.
However, in such a configuration, the distance between the axes of both rotating electrical machines includes both housings and the respective cooling water channels, and accordingly, the distance between the axes becomes longer and the installation space of both rotating electrical machines becomes larger. there were.

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide a rotating electrical machine cooling structure capable of cooling while suppressing the installation space in the case of arranging a plurality of rotating electrical machines in parallel.

The rotating electrical machine cooling structure according to the present invention is a rotating electrical machine cooling structure in which a cooling medium can be circulated and cooled through a cooling passage formed in a housing supporting a stator of the rotating electrical machine. It is arranged and arranged in parallel.
The housing has an integrated structure for housing the plurality of rotating electrical machines by providing a housing continuous part that integrally integrates the respective housing parts of the rotating electrical machines between the rotating shafts.
The rotating electric machine is characterized in that the housing continuous part is provided with a flow path common part that connects the outer peripheral cooling paths of the adjacent rotating electric machines, and includes a cooling path that connects the plurality of outer peripheral cooling paths. A cooling structure was adopted.

In the rotating electrical machine cooling structure of the present invention, one housing continuous portion and a flow path sharing portion are disposed between the shafts of a plurality of rotating electrical machines.
Therefore, compared with the case where the housing of each rotary electric machine is arrange | positioned independently, the distance between rotating shafts can be shortened and the rotary electric machine which can be cooled, suppressing the installation space in the case of arranging a plurality of rotary electric machines in parallel. A cooling structure can be provided.

FIG. 5 is an exploded perspective view showing a drive unit A to which the rotating electrical machine cooling structure of the first embodiment is applied. It is explanatory drawing of the structure and effect | action of the said drive unit A, (a) is sectional drawing which shows the state cut | disconnected in the direction orthogonal to the axial center direction of the said drive unit, (b) is the same sectional drawing in a comparative example. is there. FIG. 5 is a structure explanatory view conceptually showing a circulating cooling path in the rotating electrical machine cooling structure of the first embodiment as a planar shape; FIG. 16 is an exploded perspective view of a drive unit to which the rotating electrical machine cooling structure of the second embodiment is applied. It is structure explanatory drawing which shows notionally the circulating cooling path in the drive unit to which the rotary electric machine cooling structure of Embodiment 2 is applied as planar shape. FIG. 14 is a cross-sectional view showing the structure of the main part of a drive unit to which the rotating electrical machine cooling structure of the second embodiment is applied. FIG. 6 is a cross-sectional view of a drive unit to which a rotating electrical machine cooling structure of a third embodiment is applied.

Hereinafter, the best mode for realizing the rotating electrical machine cooling structure of the present invention will be described based on the embodiments shown in the drawings.
Embodiment 1
Hereinafter, the rotating electrical machine cooling structure of the first embodiment will be described.
(Overall configuration of drive unit)
First, the overall configuration of the drive unit A to which the rotating electrical machine cooling structure of the first embodiment is applied will be described with reference to FIG.
FIG. 1 is an exploded perspective view showing the drive unit A. FIG.

  The drive unit A includes a first rotary electric machine 1 and a second rotary electric machine 2 as a plurality of rotary electric machines. The drive unit A is applied to a hybrid vehicle. The first rotating electrical machine 1 is used as an electric motor, and the second rotating electrical machine 2 is used as a generator.

The first and second rotating electric machines 1 and 2 are well known, and include stators 11 and 21 and rotors 12 and 22.
In each of the stators 11 and 21, coils (not shown) are wound around cylindrical stator cores 11a and 21a, respectively, and a current flows through the coils to form a rotating magnetic field in the inner space of the stator cores 11a and 21a.
The rotors 12 and 22 include permanent magnets (not shown) inside rotor cores 12b and 22b fixed to the outer circumferences of the rotor shafts (rotating shafts) 12a and 22a, respectively. Rotor cores 12b and 22b are arranged with an air gap between the inner circumferences of stators 11 and 21.

Therefore, each of the first and second rotating electrical machines 1 and 2 functions as an electric motor that outputs a driving force for rotating the rotors 12 and 22 to the outside when a coil (not shown) is energized.
Each of the first and second rotating electrical machines 1 and 2 functions as a generator that generates electric power in a coil (not shown) by a driving force transmitted from the outside to the rotors 12 and 22.

The first and second rotating electric machines 1 and 2 are accommodated in the housing 3 in a state in which the rotor shafts 12a and 22a are arranged substantially in parallel.
The housing 3 includes a housing body 31, a cover unit (first cover) 32, and a rear cover (second cover) 33.

  The housing body 31 covers the outer peripheral direction of the first rotating electrical machine 1 and the second rotating electrical machine 2 and is formed in a double structure including an outer housing 31a, a first inner housing 31b, and a second inner housing 31c. There is.

  Each of the first inner housing 31 b and the second inner housing 31 c is formed in a cylindrical shape, and is tightly fitted and coupled to the outer periphery of the stator cores 11 a and 21 a.

  The outer housing 31a is formed in an eight-shaped cross-sectional shape in which two cylindrical portions 311 and 312 are integrally combined by a housing continuous portion 313 at a position between the rotor shafts 12a and 22a (between the rotation shafts). Between the outer housing 31a and the first and second inner housings 31b and 31c, there is provided a circulation cooling path 4 for circulating a coolant (cooling medium), details of which will be described later. Further, as the coolant, it is possible to use a medium such as water, coolant, oil, etc. which is used to cool the drive device in the vehicle.

  The cover unit 32 and the rear cover 33 are connected to the housing main body 31 by closing the openings at both ends in the axial direction of the housing main body 31, and the rotating electrical machines 1 and 2 are interposed between the cover unit 32 and the rear cover 33 and the housing main body 31. Form a space to accommodate the

  The cover unit 32 uses the side surface of the cover of a mechanism (for example, a transmission) arranged in parallel to both rotating electric machines 1 and 2 as a cover of the side surface of the housing 3 and extends in the axial direction of the space accommodating both rotating electric machines 1 and 2 Are closed in the first direction (arrow CE1 direction). The cover unit 32 is provided with a substantially oval thin plate-like vertical wall portion 32a as shown in the drawing, and the vertical wall portion 32a supports an axial first end of the rotor shafts 12a and 22a in the axial direction. It supports rotatably via the illustration).

  The rear cover 33 closes an end in a second direction (opposite to the arrow CE1) in the axial direction of the space for accommodating the rotary electric machines 1 and 2 therein. The rear cover 33 includes a vertical wall 33a having a shape in which two disks are integrally joined as shown in the figure, and a side edge wall 33b raised in the axial direction along the outer peripheral edge of the vertical wall 33a. And. Further, the side edge wall portion 33b is connected to coils (not shown) of the stator cores 11a and 21a, and the outlets 33c and 33c of the connection terminals 13 and 23 for connection to a harness (not shown) are opened.

(Configuration of circulation cooling path)
As described above, as shown in FIG. 2A, the housing body 31 is a circulating cooling path for circulating the coolant between the outer housing 31a and the first and second inner housings 31b and 31c. 4 is provided.

The circulation cooling path 4 is formed in a substantially inverted S shape when viewed from the direction along the axial direction by the first outer periphery cooling path 41, the second outer periphery cooling path 42, and the flow path sharing portion 43.
The first outer peripheral cooling path 41 is an outer periphery of the stator core 11a of the first rotating electrical machine 1, and is formed in a substantially cylindrical shape between the outer periphery of the first inner housing 31b and the inner periphery of the outer housing 31a. .
Moreover, the 1st outer periphery cooling path 41 is the upper right position in the figure of the cylindrical part 311, and provides the edge wall 41a (refer FIG. 3) provided in the vicinity of the housing continuous part 313, and the circumferential direction continuity is provided. The first end 41 b in the circumferential direction of the first outer peripheral cooling passage 41 is formed. And as shown in FIG. 3, the supply port 44 and the discharge port 45 are arranged in parallel in the direction along an axial direction at the 1st edge part 41b of the 1st outer periphery cooling path 41. As shown in FIG.

  As shown in FIG. 2A, the second outer periphery cooling path 42 is an outer periphery of the stator core 21a of the second rotating electrical machine 2, and is substantially cylindrical between the outer periphery of the second inner housing 31c and the outer housing 31a. It is formed in a shape. Further, the second outer periphery cooling passage 42 is cut off from the second outer periphery by cutting the circumferential continuity by the end wall 42a shown in FIG. 3 provided at the lower left position in the drawing of the cylindrical portion 312 and near the housing continuous portion 313. A circumferential first end 42 b of the cooling passage 42 is formed.

As shown in FIG. 2A, in the housing continuous portion 313 of the outer housing 31a, the flow passage shared portion 43 is an end opposite to the first end 41b in the circumferential direction of the first outer peripheral cooling path 41. And the edge part on the opposite side to the 1st edge part 42b of the circumferential direction of the 2nd outer periphery cooling path 42 is connected.
Thus, the circulation cooling path 4 has a cross-sectional shape of an inverted S-shape in FIG. 2A when viewed from the axial direction.

  Further, in the first embodiment, in the flow passage shared portion 43, the end in the circumferential direction of the first outer peripheral cooling path 41 and the end of the second outer peripheral cooling path 42 face the front. It is arranged. That is, the flow path sharing portion 43 is formed between the outer periphery of the first inner housing 31b and the outer periphery of the second inner housing 31c. Therefore, the flow passage shared portion 43 is formed between the first outer peripheral cooling passage 41 and the second outer peripheral cooling passage 42 continuously with both in the same flow passage cross-sectional area as the two.

Further, as shown in FIG. 3, the outer housing 31a includes partition walls 311a and 312a that divide the circulation cooling path 4 in a direction along the axial direction.
The partition wall 311 a provided in the cylindrical portion 311 extends circumferentially along the entire length from the flow passage shared portion 43 to the first end 41 b of the first outer peripheral cooling path 41 at the axial center position of the first outer peripheral cooling path 41. It is extended to
As a result, the partition wall 311a divides the first outer periphery cooling passage 41 into an outward passage portion 401a on the supply port 44 side and a return passage portion 402a on the discharge port 45 side. The partition walls 311a and 312a may be formed only on both inner housings 31b and 31c, or may be formed on both the outer housing 31a and both inner housings 31b and 31c.

  The partition wall 312 a provided in the cylindrical portion 312 extends in the circumferential direction from the flow path sharing portion 43 to the front of the first end portion 42 b of the second outer peripheral cooling passage 42 at the axial center position of the second outer peripheral cooling passage 42. It is done.

  Thus, the partition wall 312a divides the second outer peripheral cooling path 42 into the outward path portion 401b connected to the outward path portion 401a and the return path portion 402b connected to the backward path portion 402a, and at the first end portion 42b, the outward path portion A turn-back portion 403 that communicates 401b and the return path portion 402b is formed.

  Therefore, the circulation cooling path 4 is connected by one path from the supply port 44 to the discharge port 45 through the forward path part 401a, the forward path part 401b, the turn-back part 403, the return path part 402b, and the return path part 402a. In the flow passage shared portion 43, a constant flow passage cross-sectional area continues between the forward passage portion 401a and the forward passage portion 401b, and between the return passage portion 402b and the return passage portion 402a.

(Method of manufacturing cooling structure of rotating electrical machine)
Next, a method of manufacturing the above-described rotating electrical machine cooling structure will be described based on FIG.
First, the first and second inner housings 31b and 31c are fixed to the outer circumferences of the stator cores 11a and 21a of the first and second rotating electric machines 1 and 2 by means of shrink fitting or press fitting.

  Next, one axial end of each stator 11, 21 of the first and second rotating electric machines 1 and 2 is a vertical wall 32a of the cover unit 32 together with the first and second inner housings 31b and 31c. Then, the center axis is fixed while being defined at a predetermined position.

Next, the rotors 12 and 22 of the first and second rotating electrical machines 1 and 2 are arranged on the inner circumference of the stators 11 and 21, and the rotor shafts 12 a and 22 a are supported by the vertical wall portion 32 a of the cover unit 32. .
The installation of the rotors 12 and 22 may be performed either before or after the process of fixing the outer housing 31a described below.

Next, the outer housing 31a that integrally covers both the first and second rotating electrical machines 1 and 2 is attached to the cover unit 32, and the circulation cooling path 4 is formed between the first and second inner housings 31b and 31c. To do.
Furthermore, the rear cover 33 is fixed to the end portion of the outer housing 31a in the axial direction, and the end portions of the rotor shafts 12a and 22a are supported by the rear cover 33.

  The outer housing 31a and the rear cover 33 can be formed integrally, and the step of attaching the outer housing 31a and the step of attaching the rear cover 33 can be performed simultaneously.

When the outer housing 31a and the rear cover 33 are integrated, the rotor 12.22 is inserted into the stators 11 and 21 in advance.
On the other hand, when the outer housing 31a and the rear cover 33 are separate, the rotors 12 and 22 may be attached after the outer housing 31a is attached.

(Operation of Embodiment 1)
At the time of driving the first and second rotary electric machines 1 and 2, the coolant is supplied from the supply port 44 to the circulation cooling path 4 as indicated by an arrow IN in FIG. 3.
After passing through the forward path portion 401a formed along the outer periphery of the first rotary electric machine 1, the refrigerant liquid passes substantially the entire outer periphery of the first rotary electric machine 1 in the clockwise direction in FIG. 2A. The flow path shared portion 43 supplies the forward path portion 401 b formed along the outer periphery of the second rotary electric machine 2.

In the second rotary electric machine 2, after passing through the forward path portion 401b shown in FIG. 3 and rotating substantially the entire circumference of the second rotary electric machine 2 in the counterclockwise direction in FIG. 2 (a), the folded portion 403 shown in FIG. The direction is changed in the reverse direction to the circumferential direction in FIG. 2 and flows in the clockwise direction in FIG.
The coolant having passed through the return path portion 402b passes through the flow path shared portion 43 and travels in the counterclockwise direction in FIG. 2A of the return path portion 402a (see FIG. 3) of the first rotary electric machine 1 to discharge the outlet 45 It is discharged from (see Figure 3). Note that the discharged coolant is returned to the supply port 44 after being dissipated by the heat dissipation unit (not shown).

The cooling fluid circulates through the above-described paths to cool the rotating electrical machines 1 and 2.
In addition, as described above, in the circulation cooling path 4, the coolant flows from the forward path portion 401a of the first rotary electric machine 1 to the forward path portion 401b of the second rotary electric machine 2 → the return path portion 402b of the second rotary electric machine 2 → first Cooling is performed in the order of the return path 402a of the rotating electrical machine 1. Therefore, the first and second dual-rotating electric machines 1 and 2 are compared with the flow of only the first rotating electric machine 1 → second rotating electric machine 2 and the flow of the second rotating electric machine 2 → only the first rotating electric machine 1 2 can be cooled substantially uniformly.

(Effect of Embodiment 1)
The effects of the first embodiment are listed below.
1) The rotating electrical machine cooling structure of Embodiment 1 is
A housing 3 that houses the rotating electrical machine and supports the stator;
An outer peripheral cooling passage formed in the housing 3 along the outer periphery of the stator;
A supply port 44 which is connected to the outer peripheral cooling passage and supplies the cooling medium to the outer peripheral cooling passage, and an outlet 45 which discharges the cooling medium from the outer peripheral cooling passage;
A cooling medium that can be cooled by circulating a cooling medium in the outer peripheral cooling passage,
A plurality of (2) rotating electric machines (first rotating electric machine 1 and second rotating electric machine 2) are arranged in parallel with the rotor shafts 12a and 22a arranged in parallel,
The housing 3 is provided with a housing continuous portion 313 that continuously integrates the parts that accommodate the rotating electric machines 1 and 2 between the rotor shafts 12a and 22a, and accommodates the first and second rotating electric machines 1 and 2. With an integral structure,
The housing continuous portion 313 is provided with a flow passage shared portion 43 that connects the first and second outer peripheral cooling passages 41 and 42 of the adjacent first and second rotating electric machines 1 and 2. A circulation cooling passage 4 is formed as a cooling passage connecting the outer peripheral cooling passages 41 and 42.
Therefore, space efficiency is enhanced by arranging the rotary shafts 12a and 22a of the rotary electric machines 1 and 2 to be narrower than the rotary electric machines 1 and 2 arranged in parallel. Is possible.
In addition, the outer peripheral cooling path (011, 021 in FIG. 2B) of the housing (010, 020 in FIG. 2B) that individually accommodates both rotating electrical machines 1 and 2 is independently connected to the external coolant supply source. Connection members, such as a hose, can be reduced compared with the case where it connects or connects outer periphery cooling paths. And the cost and the installation space can be reduced by the reduction of the number of parts.

2) The rotating electrical machine cooling structure of Embodiment 1 is
A supply port 44 is provided at the first end of the end portion 41 b that is both ends in the extending direction of the circulation cooling passage 4 as a cooling passage, and a discharge port 45 is provided at the second end portion. The supplied coolant is formed so as to be able to be discharged from the discharge port 45 through the first and second outer peripheral cooling paths 41 and 42 and the flow path shared portion 43 therebetween.
Therefore, when the first and second rotating electric machines 1 and 2 are arranged side by side, the supply port and the discharge port required for each can be combined into one set as a whole, and the number of parts, cost, and installation space can be reduced. Reduction is possible.
In addition, the reduction effect of the connection member such as the hose described in the above 1) can be reliably obtained.

3) The rotating electrical machine cooling structure of Embodiment 1 is
The channel common part 43 is characterized by having substantially the same channel cross-sectional area as the first and second outer peripheral cooling channels 41 and 42 continuous on both sides thereof.
Therefore, the distance (interaxial distance) between the rotor shafts 12a, 22a of the two rotating electric machines 1, 2 is set to the size of one of the first and second outer peripheral cooling paths 41, 42 and to the outer peripheral cooling paths 41, 42. Can be reliably narrowed by the size of the two outer housings that separate the housing from the outside.
In addition, since the flow passage cross-sectional area does not change in the flow passage sharing portion 43, the flow of the coolant is smoother than that in the case where the cross-sectional area change occurs, and the cooling performance can be ensured.

Here, a comparative example is shown in FIG.
In this comparative example, the housings 010 and 020 of the two motors M1 and M2 respectively include independent outer peripheral cooling paths 011 and 021. The outer peripheral cooling paths 011 and 021 supply the cooling liquid from the supply ports 012 and 022, respectively, and discharge the cooling liquid to the outside from the discharge ports (not shown) provided in parallel with the supply ports 012 and 022.
In this comparative example, when two motors M1 and M2 are arranged side by side in contact, a dimension L01 is required in the direction connecting the central axes of the motors M1 and M2.
On the other hand, in the first embodiment, the flow passage shared portion 43 that connects the first and second outer peripheral cooling paths 41 and 42 is provided, and the flow passage cross-sectional area of the flow passage shared portion 43 is set to each of the outer peripheral cooling paths 41, 42. It was set as the channel cross-sectional area continuous with 42. As a result, the dimension obtained by adding the thickness of the housings 010, 020 between the outer periphery cooling paths 011 and 021 and the radial dimension of one of the outer periphery cooling paths 011 and 021 is a direction orthogonal to the axial direction by the dimension L1. The dimensions of can be shortened.
Further, even if the first and second outer peripheral cooling paths 41 and 42 are arranged and connected in parallel in the inter-axis direction, the thicknesses of the housings 010 and 020 in the outer diameter direction than both the outer peripheral cooling paths 41 and 42 are connected. Minutes can reduce the distance between the axes.

4) The rotating electrical machine cooling structure of Embodiment 1 is
The housing 3
First and second inner housings 31b and 31c fixed to the outer circumferences of the stators 11 and 21 of the rotating electric machines 1 and 2,
An outer housing 31a that covers the first and second inner housings 31b and 31c and forms a circulation cooling path 4 between the first and second inner housings 31b and 31c;
A cover unit 32 and a rear cover 33 are provided to cover both ends of the first and second inner housings 31b and 31c and the outer housing 31a in the direction along the rotor shafts 12a and 22a.
As described above, since the circulation cooling path 4 is formed between the outer housing 31a and the first and second inner housings 31b and 31c, compared with the case where the circulation cooling path 4 is formed by casting or the like. , Easy to manufacture.

5) The rotating electrical machine cooling structure of Embodiment 1 is
In the outer housing 31a, a supply port 44 and a discharge port 45 are arranged side by side in a direction along the rotor shafts 12a and 22a.
At least one of the outer housing 31a and the first and second inner housings 31b and 31c, the first and second outer peripheral cooling paths 41 and 42 and the flow path shared portion 43 are directed outward along the rotor shafts 12a and 22a. 401a, 401b and return path sections 402a, 402b are partitioned, and at one end of the forward path sections 401a, 401b and the return path sections 402a, 402b, a return section 403 that connects the forward path sections 401a, 401b and the return path sections 402a, 402b is provided. Partition wall 311a, 312a is provided, the supply port 44 is provided at the end opposite to the return portion 403 of the forward path portion 401a, and the discharge port 45 is provided at the end opposite to the return portion 403 of the return path 402a; The circulation cooling path 4 is discharged from the supply port 44 through the forward path parts 401a and 401b, the turn-back part 403, and the return path parts 402a and 402b. Characterized in that the flow passage 5.
Therefore, compared with the case where the cooling fluid flows only from the first rotating electrical machine 1 to the second rotating electrical machine 2 or conversely from the second rotating electrical machine 2 to the first rotating electrical machine 1, the movement of the heat quantity Efficient cooling can be performed without

6) The method of manufacturing the rotating electrical machine cooling structure according to the first embodiment
Fixing each inner housing 31b, 31c to the outer periphery of the stator 11, 21 of each rotating electrical machine 1, 2,
Fixing the stators 11 and 21 of the rotating electric machines 1 and 2 to the cover unit 32 together with the inner housings 31b and 31c;
Arranging the rotors 12 and 22 of the rotating electrical machines 1 and 2 on the inner periphery of the stators 11 and 21 and attaching them to the cover unit 32;
Fixing the outer housing 31a to the cover unit 32, forming the circulation cooling path 4 between the outer housing 31a and the inner housings 31b and 31c, and supporting the end of the rotors 12 and 22 by the rear cover 33; ,
And the like.

When the first and second rotating electric machines 1 and 2 are arranged side by side, when the accuracy of the distance between the two axes is required, the manufacturing procedure for assembling the rotating electric machines 1 and 2 integrally with each housing In this case, the error in the distance between the axes may be large.
On the other hand, in this Embodiment 1, since the rotors 12 and 22 of both rotary electric machines 1 and 2 are attached to the common cover unit 32, the accuracy of the distance between axes can be ensured.
In addition, since the circulation cooling path 4 is formed between the inner housings 31b and 31c by fixing the common outer housing 31a to the inner housings 31b and 31c, the circulation cooling path 4 is also excellent in productivity.

(Other embodiments)
Next, a rotating electrical machine cooling structure according to another embodiment will be described.
Since the other embodiment is a modification of the first embodiment, the same reference numerals as those in the first embodiment are assigned to the same components as those in the first embodiment, and the description thereof is omitted. Only the differences from the above will be explained.

Second Embodiment
The second embodiment is an example in which the outer housing is formed by two members, and the structure and the manufacturing method thereof are slightly different from the first embodiment.

FIG. 4 is an exploded perspective view showing the structure of a housing 203 to which the rotating electrical machine cooling structure of the second embodiment is applied.
The housing 203 includes the first inner housing 31 b and the second inner housing 31 c similar to those of the first embodiment.
On the other hand, a first outer housing 231 and a second outer housing 232 are provided as the outer housing.

  As shown in FIG. 6, the first outer housing 231 and the second outer housing 232 are orthogonal to each other through the outer periphery of the first and second outer peripheral cooling paths 41 and 42 as shown in FIG. A part of the outer periphery is cut along the direction line S6.

  The outer housings 231 and 232 are arranged so that the shape of the housing continuous portion 213 is such that the cross-sectional area of the flow passage does not change at a position where the first and second outer peripheral cooling passages 41 and 42 overlap in the radial direction. The cross-sectional area of the cooling paths 41 and 42 is gradually narrowed.

  In the method of manufacturing the rotating electrical machine cooling structure of the second embodiment, the stator 11 of the first rotating electrical machine 1 is fixed to the inner periphery of the first inner housing 31b, and the first inner housing 31b is placed inside the first outer housing 231. It is fixed to the circumference to form a double cylinder structure shown in FIG.

  Similarly, the stator 21 of the second rotating electrical machine 2 is fixed to the inner periphery of the second inner housing 31c, and the second inner housing 31c is fixed to the inner periphery of the second outer housing 232, similarly shown in FIG. Double cylinder structure.

The two double cylinder structures and the rotors 12 and 22 shown in FIG. 4 are attached to the cover unit 32 with the axial position thereof positioned at a predetermined position. At this time, a process for ensuring the sealing performance of the outer periphery of the flow path sharing part 243 (for example, a process of interposing a sealing material or applying a sealing agent to the outer periphery of the joint part) is performed.
Thereafter, as in the first embodiment, the rear cover 33 is attached to the end portions of the outer housings 231 and 232.
Even in the second embodiment, the effects of the above 1) to 4) can be obtained.

Third Embodiment
The third embodiment is a modification of the layout of the cooling path.
FIG. 7 is a conceptual view of the rotating electrical machine cooling structure according to the third embodiment, which includes three rotating electrical machines 301, 302, and 303.
Each rotating electrical machine 301, 302, 303 includes inner housings 301 a, 302 a, 303 a and also includes outer housings 301 b, 302 b, 303 b via a circulation cooling path 304. The outer housings 301b, 302b, and 303b may be formed integrally as in the first embodiment, or may be formed independently as shown in the second embodiment.

The circulation cooling path 304 includes an outward path 341 and a return path 342.
The forward path part 341 is connected to the upper half outer peripheral cooling path 341a, 342a, 343a via the flow channel sharing part 313a, 313b from the supply port 344 in the drawings of the rotating electrical machines 301, 302, 303. To.
The return path part 342 is connected to the lower half outer periphery cooling path 341b, 342b, 343b via the flow path sharing part 313c, 313d from the turn-back part 343 in the drawings of the rotating electric machines 301, 302, 303, and the discharge port 345. To.

Therefore, even in the third embodiment shown in FIG. 7, the effects of the above 1) to 3) can be obtained. In addition, in the circulation cooling path 304 of the path shown in the third embodiment, the number of rotating electrical machines can be a plurality other than “3” (two or more than four).
Further, the positions of the supply port 344 and the discharge port 345 can be provided at positions other than the positions shown in the drawing, as long as they are on the way of the circulation cooling path 304 around the outer periphery of the plurality of rotating electrical machines 301, 302, 303.

  As described above, the rotating electrical machine cooling structure of the present invention has been described based on the embodiment. However, the specific configuration is not limited to this embodiment, and the invention according to each claim of the claims is not limited thereto. Modifications and additions to the design are permitted without departing from the scope of the invention.

For example, the embodiment shows an example in which the rotating electrical machine cooling structure of the present invention is applied to a hybrid vehicle. However, the rotary electric machine cooling structure of the present invention can be applied to other than the hybrid vehicle as long as a plurality of rotary electric machines are arranged in parallel. Further, the number of rotating electrical machines arranged in parallel is not limited to “2” and “3” shown in the embodiment.
Further, when the first and second outer peripheral cooling passages 41 and 42 are overlapped in the radial direction in the housing continuous portion 213 as in the second embodiment, the flow channel sharing portion 243 as in the second embodiment. It is preferable to use the same flow passage cross-sectional area as each of the outer peripheral cooling passages 41 and 42. However, the present invention is not limited to this, and the outer periphery cooling passages 41 and 42 are extended in the passage sharing portion 243 so as to generate a portion having a passage sectional area corresponding to two of the outer periphery cooling passages 41 and 42. It is also possible to shape it.

DESCRIPTION OF SYMBOLS 1 1st rotary electric machine 2 2nd rotary electric machine 3 Housing 4 Circulation cooling path 11 Stator 12 Rotor 12a Rotor shaft (rotating shaft)
21 Stator 21a Stator core 22 Rotor 22a Rotor shaft (rotational shaft)
31 Housing body 31a Outer housing 31b First inner housing 31c Second inner housing 32 Cover unit (first cover)
33 Rear cover (second cover)
41 first outer peripheral cooling path 42 second outer peripheral cooling path 43 flow path common part 44 supply port 45 discharge port 113 housing continuation part 401 a forward path part 401 b forward path part 402 a return path part 402 b return path part 403 return part A drive unit

Claims (2)

A housing that houses the rotating electrical machine and supports the stator;
An outer peripheral cooling passage formed in the housing along an outer periphery of the stator;
A supply port connected to the outer periphery cooling path, for supplying a cooling medium to the outer periphery cooling path, and an outlet for discharging the cooling medium from the outer periphery cooling path;
A rotating electrical machine cooling structure in which a cooling medium is circulated in the outer peripheral cooling passage to be cooled,
A plurality of the rotary electric machines are arranged in parallel with the respective rotation axes arranged in parallel,
The housing is provided with a housing continuous part that continuously integrates the respective parts of the rotating electrical machine between the rotating shafts, and has an integrated structure for housing the plurality of rotating electrical machines,
Wherein the housing contiguous portions, a channel shared portion connecting the outer circumferential cooling passages of the rotary electric machine adjacent arranged, e Bei a plurality of outer circumferential cooling passage circulating cooling line which connects,
The housing is
A plurality of inner housings fixed to the outer periphery of the stator of each rotary electric machine;
An outer housing that covers the plurality of inner housings and forms the circulation cooling path between the plurality of inner housings;
A first cover and a second cover covering both ends of each inner housing and the outer housing in the direction along the rotation axis;
With
In the outer housing, the supply port and the discharge port are juxtaposed in a direction along the rotation axis,
The outer peripheral cooling passage and the flow passage shared portion are divided into a forward passage portion and a return passage portion in at least one of the outer housing and each inner housing along the rotation axis, and one end of the forward passage portion and the return passage portion A partition is provided having a folded back portion communicating both passage portions in one part, and the supply port is provided at an end of the forward path opposite to the folded back portion, and the opposite side to the folded back portion of the return path The rotary electric machine cooling structure is characterized in that the discharge port is provided at an end portion, and the circulation cooling path is a flow path from the supply port to the forward path, the return part, the return path and the discharge port. . In the rotating electrical machine cooling structure according to claim 1 ,
The rotating electrical machine cooling structure, wherein the flow passage common part has a flow passage cross-sectional area substantially the same as that of each outer peripheral cooling passage continuous on both sides thereof.