JP2003224945A - Cooling structure of stator in dynamo-electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a cooling oil sealing wall section which constitutes a coil end chamber sealed in a coil end section from peeling off at a root section thereof. <P>SOLUTION: The cylindrical cooling oil sealing wall section 23 is formed integrally with a sealing resin layer blocking a slot in a stator core 14. The coil end chamber 18 is formed, which is sealed by a contact with a seal ring 17a of a front cover 12a. To prevent the cooling oil sealing wall section 23 from peeling off at the root section, if a moment 34b based on a relative position error between the cooling oil sealing wall section 23 and the front cover 12a acts, a rib 36 which comes into contact is provided at the section. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure for a stator in a rotary electric machine, and more particularly to a part of a slot in which a stator winding (stator coil) is housed and coils at both ends of a stator core for efficiently cooling the stator. The present invention relates to a cooling structure for a stator in a rotating electric machine, in which each of the end chambers is used as a cooling passage and a cooling liquid such as cooling oil is allowed to flow therethrough to forcibly cool at least the stator winding.

[0002]

2. Description of the Related Art In a cooling structure for a rotating electric machine, in order to efficiently cool a stator, a resin cylinder that closes a slot in which a winding is housed is formed on the inner peripheral surface of a coil end and a stator core. For example, Japanese Patent No. 2716286 discloses a structure in which a space is provided around the winding by inserting the cover and sealing the covers at both ends of the stator, and the space is used as a cooling passage to allow cooling oil or the like to flow therethrough. Has been done. With such a configuration, the stator winding or the stator core, which is a heating element, is forcibly cooled by directly contacting the cooling liquid, and high cooling performance is obtained.

[0003]

However, in such a conventional cooling structure for a rotating electric machine, when the covers at both ends of the stator are hermetically sealed, an error due to insufficient accuracy of the covers and a resin cylinder and both ends of the stator are caused. There is a problem that when a radial load is applied to a resin cylinder, the resin cylinder may be deformed due to dimensional variation of the sealing material for sealing the cover.

The present invention has been made in view of such a problem, and a resin layer for closing the slot opening on the inner peripheral side of the stator core is extended to both ends of the stator core to form a cylindrical sealing wall. While providing a sealed space around the winding with the sealing wall portion and the case, it is possible to reliably prevent peeling of the sealing wall portion and liquid leakage accompanying it. .

[0005]

According to a first aspect of the present invention, there is provided a stator core in which a slot having an opening on the inner peripheral surface side is formed along the axial direction, and the stator core is arranged at both axial end surfaces. An end cap, a winding wire wound around an axial direction of a stator core including the end cap and accommodated in the slot, an under plate disposed near the opening of the slot, and the under plate. A sealing resin layer that forms a cooling passage inside the slot by closing the slot opening on the inner peripheral side of the plate, and is integrally formed with the sealing resin layer and protrudes from the end caps at both ends of the stator core to form a case. And a sealing wall portion that forms a sealed coil end chamber that surrounds the winding end portion, respectively. A cooling structure for a stator in a rotating electric machine, wherein at least a winding is forcibly cooled by causing a cooling liquid to flow through a coil end chamber, the end of the stator core projecting in a diametrical direction at an end of the sealing wall. It is characterized in that a rib that abuts on the cap is formed.

In this case, as described in claim 2, the rib and the end cap are respectively brought into contact with each other with a plane perpendicular to the wall surface of the sealing wall and a plane parallel thereto. Preferably, the rib and the end cap have two surfaces, a plane parallel to a wall surface of the sealing wall portion and a surface parallel to the wall surface of the sealing wall portion, as well as an outer periphery of the wall surface of the sealing wall portion. It is more desirable that the respective abutting surfaces are abutted with each other.

The invention according to claim 4 is based on the premise of claim 1, wherein the sealing wall portion is formed as a two-layer structure by a ring and a sealing resin layer integrated with the ring. , In the portion corresponding to the root of the dense ring,
It is characterized in that a rib that abuts against the end cap is formed while projecting in the diametrical direction of the stator core.

In this case, the rib and the end cap are brought into contact with each other with a surface perpendicular to the wall surface of the sealing wall portion and a surface parallel to the wall surface of the sealing wall portion. Preferably, the rib and the end cap have two surfaces, a surface parallel to a surface perpendicular to the wall surface of the sealing wall portion and a wall surface of the sealing wall portion, as described in claim 6. It is more preferable that the different surfaces located on the outer peripheral side contact each other.

According to a seventh aspect of the present invention, on the premise of the sixth aspect, the ring is a power feeding ring for connecting windings individually housed in a plurality of slots. And

[0010]

According to the invention as set forth in claim 1, ribs projecting from the root of the sealing wall formed integrally with the sealing resin layer are brought into contact with the end caps to seal the sealing wall and the end. The contact area with the cap is increased, and even if a load is applied due to a relative position error between the sealing member that controls the seal between the sealing wall and the cover and the sealing wall, the sealing wall There is an effect that the peeling from the end cap can be prevented.

Particularly, as described in claim 2, the rib and the end cap are respectively brought into contact with each other by two surfaces of a surface perpendicular to the wall surface of the sealing wall portion and a surface parallel thereto, or As described in claim 3, when the two surfaces are abutted against each other by another surface located on the outer peripheral side of the wall surface of the sealing wall portion, the sealing wall portion and the end cap are brought into contact with each other. The area is further increased, and there is an effect that the separation between the sealing wall portion and the end cap can be more reliably prevented.

According to the invention described in claim 4, since the hermetically sealing wall portion is formed as a two-layered structure by the ring having ribs protrudingly and the hermetically sealing resin layer integrated with the ring, In addition to the effect similar to that of the invention described above, the mechanical strength of the sealing wall portion is also improved.

According to the fifth and sixth aspects of the present invention, the sealing wall portion is formed as a two-layer structure by a ring having ribs projecting from the ring and a sealing resin layer integrated with the ring. Since the surface where the rib and the end cap contact each other is increased in the same manner as in the invention described in claim 3, the contact area between the sealing wall portion and the end cap is further increased, and the sealing wall portion and the end cap are separated from each other. Can be prevented more reliably,
This has the effect of improving the mechanical strength of the sealing wall.

According to the invention described in claim 7, since the ring is a power supply ring for connecting the windings individually housed in the plurality of slots, the invention according to claim 6 is achieved. In addition to the same effect, the space efficiency of the rotary electric machine is improved, and the size and efficiency of the rotary electric machine can be reduced.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 5 show the first preferred embodiment of the present invention.
FIG. 1 is a diagram showing an embodiment of the present invention, and in particular, FIG.

As shown in FIG. 1, the rotary electric machine 1 is housed in the front portion of the vehicle body skeletal member 200 and is provided with a front mount 201 and a rear mount (not shown) so as not to be directly subjected to vibration while the vehicle is traveling. And axle mount 20
4, a front axle member 202 and a front suspension member (not shown) are connected and supported together with the transaxle 203. Further, since the rotary electric machine 1 is fastened to the transaxle 203 with bolts and nuts (not shown), the rotor shaft of the rotary electric machine 1 and the main shaft of the transaxle 203 are spline-fitted to each other. The driving force of the electric machine 1 is transmitted to the axle via the transaxle 203, and the axle is rotationally driven.

2 is a vertical sectional view of the rotary electric machine 1, FIG. 3 is a sectional view taken along line BB of FIG. 2, and FIG.
Shows an enlarged view of a main part of FIG. 2, that is, an enlarged view of a coil end portion.

The rotor 6 is a rotor shaft 7 made of steel.
And a rotor core 8 formed by laminating a number of thin electromagnetic steel plates, end plates 9a and 9b made of a non-magnetic material, and a permanent magnet 10. Rotor core 8 and end plates 9a and 9b
Is press-fitted into the rotor shaft 7 while being pressed with a constant pressure, and after the permanent magnet 10 is inserted and bonded to the rotor core 8, the end plates 9a and 9b are welded and fixed to the rotor shaft 7. Further, the rotor 6 has bearings 11a,
The front cover 12a and the rear cover 12b are rotatably supported via 11b, and a dust seal 13 is attached to the front cover 12a.

On the other hand, the stator 24 is the front cover 12
It is press-fitted and fixed to the case main body 15a that will form the case 15 together with a and the rear cover 12b, and the front cover 12a and the rear cover 12b are attached to the front and rear surfaces of the case main body 15a via the O-rings 16a or 16b. It is fastened with bolts (not shown). The front cover 12a and the rear cover 12b have seal rings 17a or 17 each having a concave cross section.
b is attached to the seal rings 17a and 17b.
By inserting a cooling oil sealing wall portion 23, which will be described later, into pressure contact with the cooling oil sealing wall portion 23, sealed annular coil end chambers 18 and 19 are formed on both sides of the stator 24 in the axial direction.

The stator 24 includes a stator core 14 formed by laminating thin electromagnetic steel plates, and end caps 20 made of an insulating material and arranged on both sides of the stator core 14.
A coil 21 as a winding made of copper wire, an under plate 22 made of an insulating material, and a sealing resin layer 2 described later.
3a and a cooling oil sealing wall portion 23 formed integrally. In this stator 24, as shown in FIG. 3, an end cap 20 having substantially the same shape as the core divided piece 14a is applied to each of the core divided pieces 14a divided into a plurality in the circumferential direction of the stator core 14. Multiple windings of the coil 21 along the longitudinal direction are connected to each other in an annular shape while being fitted to each other with the fitting projections 25 and the fitting recesses 26 on the side surface of the back teeth, and are welded or the like. They are fixed to each other. Therefore, a slot 27 opening toward the inner peripheral surface side of the stator 24 is formed between the adjacent core divided pieces 14a, 14a, and this slot 27 functions as a cooling passage through which cooling oil described later flows. It will be.

As shown in FIG. 3, an under plate 22 is disposed on the opening side of the slot 27, and a sealing resin layer 23a is filled inside the stator core 14 with an insulating resin material further inside the under plate 22. It is arranged so as to be substantially flush with the peripheral surface. As shown in FIG. 2, the sealing resin layer 23a projects on both sides of the stator 24 as cooling oil sealing wall portions 23 by a predetermined amount. The under plate 22 adheres to the stator core 14 by the molding pressure of the resin when the plastic resin to be the sealing resin layer 23a is filled, so that the plastic insulating resin material leaks to the slot 27 side. It has a function to prevent it.

Further, as shown in FIG. 3, the sealing resin layer 23a projects from both sides of the stator 24, even though the slots 27 are independent of each other in the portion corresponding to the axial length of the stator 24. The portion to be formed is integrally formed as a cylindrical cooling oil sealing wall portion 23, and the cooling oil sealing wall portion 23 is pressed against the seal rings 17a and 17b to seal the coil as described above. End chambers 18 and 19 are formed.

Further, each core division piece 1 is provided at the coil end portion.
A connection ring 30 for electrically connecting the coils 21 and 21 to be wound around the coil 4 a and accommodated in the slot 27 is arranged. The connection ring 30 is made of metal, is electrically joined to the coil 21, and is electrically connected to a control device (not shown) outside the rotary electric machine 1.

The front cover 1a is provided with a supply port 29 for cooling oil which is a cooling liquid so as to communicate with the coil end chamber 18 and a discharge port 31 for cooling oil which also communicates with the coil end chamber 19. There is. The cooling oil, which is the cooling liquid, is pressure-fed to the supply port 29 by an oil pump (not shown), fills one coil end chamber 18, and then passes through each slot 27, 27 ... In the stator 24 as a cooling passage, and further the other. After the coil end chamber 19 is filled, it is discharged from the discharge port 31 toward an oil cooler (not shown). In FIG. 2, the flow of the cooling oil is indicated by reference numeral 28. As described above, the cooling oil is supplied to the coil end chamber 18 on one side and the slots 27, 27 ... And the coil end chamber 1 on the other side.
By passing through 9, the stator core 14 and the coil 21 are forcibly cooled and their heat generation is suppressed.

In this structure, if there is a manufacturing variation in the cooling oil sealing wall portion 23 formed on the stator 24 or a manufacturing variation in each of the front cover 12a and the rear cover 12b, the cooling oil sealing wall portion 23, the front cover 12a and In addition to the rear cover 12b, the seal rings 17a and 17b to be interposed between them cannot be concentric with each other. Due to this variation in relative position accuracy, a load 32a or 32b in the radial direction of the stator 24 is generated in the cooling oil sealing wall portion 23 as shown in FIG. 4, and this load 32a or 32b is applied to the cooling oil sealing wall portion 23. And a moment 34 about the point 33a or 33b on the boundary surface 35 of the end cap 20
a or 34b is generated, peeling occurs at the boundary surface 35 between the cooling oil sealing wall portion 23 and the end cap 20, and in turn, the sealing performance is deteriorated.

Therefore, in this embodiment, countermeasures as shown in FIGS. That is, FIGS. 5 to 8 are enlarged views of the same parts as those in FIG. 4, and the same parts as those in FIG. 4 are designated by the same reference numerals.

As shown in FIG. 5, a rib having a substantially triangular cross-section protruding toward the outer peripheral side is provided at a root portion of the outer peripheral wall surface of the cooling oil sealing wall portion 23 having a cylindrical shape which is close to the end cap 20. 36 is integrally formed over the entire circumference. The rib 36 corresponds to the sealing resin layer 23a described above.
A boundary surface (a boundary surface corresponding to the wall thickness of the cooling oil sealing wall portion 23) 3 which is integrally formed with the cooling oil sealing wall portion 23 at the time of molding, and is perpendicular to the stator axis as shown in FIG.
The slanted boundary surface 39 adjacent to 5 is in close contact with or in contact with the end cap 20.

Therefore, as described above, the cooling oil sealing wall portion 23, the front cover 12a or the rear cover 1 is provided.
When a moment 34b is applied to the cooling oil sealing wall portion 23 by the load 32b based on the relative position error with 2b,
Since the contact area of the cooling oil sealing wall portion 23 with respect to the end cap 20 is increased by the amount of the oblique boundary surface 39 so as to oppose the action direction of the moment 34b, the moment 34b is received by the oblique boundary surface 39. By dispersing, mutual separation between the end cap 20 and the cooling oil sealing wall portion 23 at the boundary surface 35 is prevented in advance.

FIG. 6 shows a modified example of FIG. 5, in which a rib 40 having a substantially triangular cross section which projects toward the outer peripheral side is entirely provided at the root of the outer peripheral wall surface of the cooling oil sealing wall portion 23 having a cylindrical shape. It is integrally formed over the circumference, and one side portion of the triangle is set to be flush with the boundary surface 35 which is the end surface of the cooling oil sealing wall portion 23 on the end cap 20 side. And
A boundary surface 44 that is flush with the boundary surface 35 that is perpendicular to the stator axis is in close contact with or in contact with the end cap 20.

Therefore, in this modification, the cooling oil sealing wall portion 23, the front cover 12a or the rear cover 12 is used.
When the moment 34b is applied to the cooling oil sealing wall portion 23 by the load 32b based on the relative position error with respect to b, the ribs 40 should face each other in the acting direction of the moment 34b.
Since the contact area of the cooling oil sealing wall portion 23 with respect to the end cap 20 is increased by the amount of the boundary surface 44 on the side,
By receiving and dispersing the moment 34b at the boundary surface 44, mutual separation between the end cap 20 and the cooling oil sealing wall portion 23 at the boundary surface 35 is prevented in advance.

FIG. 7 shows another modified example, in which a rib 45 having a rectangular cross section which projects toward the outer peripheral side is formed at the root of the outer peripheral wall surface of the cooling oil sealing wall portion 23 having a cylindrical shape over the entire circumference thereof. Over the entire surface, one side of which is the cooling oil sealing wall 23
It is set so as to be flush with the boundary surface 35 which is the end surface on the side of the end cap 20. The boundary surface 46, which is flush with the boundary surface 35, and the boundary surface 47, which is parallel to the axial direction of the stator, are in close contact with or in contact with the end cap.

Therefore, in this modification, the cooling oil sealing wall portion 23, the front cover 12a or the rear cover 12 is used.
When a moment 34b is applied to the cooling oil sealing wall portion 23 by the load 32b based on the relative position error with respect to b, the rib 45 is arranged so as to oppose the acting direction of the moment 34b.
Since the contact area of the cooling oil sealing wall portion 23 with the end cap 20 is increased by the amount of the boundary surfaces 46 and 47 on the side, the moment 34b is received by the boundary surfaces 46 and 47 and dispersed. Similarly, when a moment 34 a is applied to the cooling oil sealing wall portion 23 by the load 32 a based on the relative position error with the cooling oil sealing wall portion 23 and the front cover 12 a or the rear cover 12 b, the boundary surface 47 receives the moment 34 a. To disperse. Thus, even if the moments 34a and 34b from two directions act, those moments 34a and 34b are received by the boundary surfaces 46 and 47, and the end cap 20 and the cooling oil sealing wall portion 23 at the boundary surface 35 are received.
It is possible to prevent mutual peeling with

FIG. 8 shows still another modified example, in which the root portion of the outer peripheral wall surface of the cylindrical cooling oil sealing wall portion 23 is
A rib 50 having a rectangular cross section that projects toward the outer peripheral side is integrally formed in a stepped shape over the entire circumference. And
The original boundary surface of the cooling oil sealing wall portion 23 (the cooling oil sealing wall portion 23
In addition to the boundary surface 51 parallel to the boundary surface 35 corresponding to the wall thickness), two boundary surfaces 52 and 53 perpendicular to the boundary surface 51 are in close contact with or in contact with the end cap 20.

Therefore, in this modification, the cooling oil sealing wall portion 23, the front cover 12a or the rear cover 12 is used.
When the moment 34b is applied to the cooling oil sealing wall portion 23 by the load 32b based on the relative position error with respect to b, the rib 50 is arranged so as to oppose the acting direction of the moment 34b.
End cap 2 by the amount of the boundary surfaces 51, 52, 53 on the side
Since the contact area of the cooling oil sealing wall portion 23 with respect to 0 is increased, the moment 34b is reduced to the boundary surfaces 51, 52, 5
Receive at 3 and disperse. Similarly, when a moment 34a is applied to the cooling oil sealing wall portion 23 by the load 32a based on the relative position error with the cooling oil sealing wall portion 23 and the front cover 12a or the rear cover 12b, the moment 34a is applied to the boundary surfaces 52, 53. Receive with and disperse. Thus, even if moments 34a and 34b from two directions act, those moments 34a and 34b are applied to the boundary surface 5
It is possible to prevent the mutual separation of the end cap 20 and the cooling oil sealing wall portion 23 at the boundary surface 35 by receiving them by 1, 52, 53.

Particularly in this modification, the boundary surfaces 51, 52, 5 are
Since the number of 3 is the largest and the boundary surface 52 is located further outside than the two boundary surfaces 51 and 53, it is more effective in preventing the above peeling.

Here, in the example shown in FIGS.
6, 40, 45, 50 and end cap 20
The cooling oil sealing wall portion 23 is provided on the boundary surface where
Since the resin filling pressure at the time of molding the
The height H of 6, 40, 45, 50 is set to an arbitrary size within a range in which the end cap 20 is not damaged by the resin filling pressure. Also, each rib 36, 4
0, 45, and 50 do not necessarily have to be formed on the entire circumference of the cooling oil sealing wall portion 23, and may be partially formed at a plurality of locations.

9 to 12 show a second embodiment of the present invention and show enlarged sectional views of parts equivalent to those shown in FIGS. 5 to 8, respectively.

In FIG. 9, a cylindrical cooling oil sealing wall portion 57 is provided.
However, it is formed as a two-layer structure by integrally molding a metal ring 59 having a rib 58 having a substantially triangular cross-section protruding at the root of the outer peripheral surface and a sealing resin layer 61 which is an inner layer thereof. Are different from those shown in FIG.
The metal ring 59 is manufactured by subjecting a predetermined metal plate, which is a base material, to plastic working or by joining such as welding. The metal ring 59 is separated from the joining surface 60 with the sealing resin layer 61. It is desirable that an uneven surface or a wedge-shaped surface is formed in advance so that an anchor effect for prevention can be obtained.

Therefore, the entire cooling oil sealing wall 57 has the same shape as that shown in FIG. 5, and the effect of preventing separation at the boundary surface 35 between the cooling oil sealing wall 57 and the end cap 20 is exhibited. It will be. In addition, since the metal ring 59 is provided, the mechanical strength of the cooling oil sealing wall portion 57 is also improved, and when the metal ring 59 is integrally molded with the sealing resin layer 61 as an insert, the metal There is an advantage that the resin material can be surely sealed by the contact between the rib 58 and the mold to be arranged on the outer side of the ring 59.

In the structure shown in FIGS. 10, 11 and 12, the cooling oil sealing wall portion 23 shown in FIGS. 6 to 8 as a modified example of FIG.
The cooling oil sealing wall portion 57 having the same shape as the above is formed as a two-layered structure with a metal ring 59 and a resin layer 61 on which the same components as the ribs 58 are projectingly provided in the same manner as described above. Therefore, not only the peeling prevention effect at the boundary surface 35 between the cooling oil sealing wall portion 57 and the end cap 20 is exhibited, but also the mechanical strength of the cooling oil sealing wall portion 57 is improved, and further, the metal There is an advantage that the resin material can be reliably sealed when the ring 59 is used as an insert and integrally molded with the resin layer 61.

13 to 17 show a third embodiment of the present invention.

FIG. 13 shows a vertical sectional view of the rotary electric machine 1, FIG. 14 is an enlarged sectional view taken along the line CC of FIG. 13, and FIG. 15 is an enlarged sectional view taken along the line EE of FIG. Shows. 16 shows an enlarged sectional view taken along the line DD of FIG. 13, and FIG. 17 shows an enlarged sectional view taken along the line FF of FIG.

In the coil end portions shown in FIGS. 14 and 15 in addition to FIG. 13, the starting end point 62 of the coil 21 housed in the stator core 14 is a part of the cooling oil sealing wall portion 57 in the same manner as in FIGS. Metal ring 5 to be formed
It is electrically joined to the ribs 58 of 9. The coil starting point 62 and the rib 58 of the metal ring 59 are electrically joined by a joining method such as laser welding, electron beam welding, ultrasonic welding, resistance welding or caulking. Also,
The shape of the rib 58 of the metal ring 59 may be any of those shown in FIGS.

In the other coil end portion shown in FIGS. 16 and 17, as shown in FIG. 18, a local rib 64 is projectingly provided at the root portion for connecting the U phase, V phase and W phase. Metal rings 63 of different types are arranged so as to overlap one another. The surface of the metal ring 63 is coated with an insulating material except for a part thereof. The cross-sectional shape of the rib 64 of the metal ring 63 may be any one of those shown in FIGS. 9 to 12, and the metal ring 63 may be superposed as an inner layer on the inside. The sealing resin layer 61 is integrally formed to form the cooling oil sealing wall portion 57.

U, V, which are arranged at the coil end,
The end point 65 of the coil 21 housed in the stator core 14 is provided at a portion of the rib 64 of the metal ring 63 for each phase W that is not coated with an insulating material via U, V, W via the metal plate 66. A metal ring 63 for each phase of
It is electrically connected to one of the two. The coil end point 65 and the rib 64 on the metal ring 63 side are electrically joined by a joining method such as laser welding, electron beam welding, ultrasonic welding, resistance welding, or caulking. further,
A part 68 of the three types of metal rings 63 is electrically connected to an external control unit (not shown).

As described above, in the present embodiment, the metal ring 5 that forms a part of the cooling oil sealing wall portion 57.
Reference numerals 9 and 63 also serve as a power supply ring or a connection ring, and the other configurations are basically the same as those shown in FIG.

As a result, the power supply ring or the connection ring 30 conventionally arranged at the coil end portion or the like for connecting the coil 21 housed in the stator core 14 is connected.
(See FIGS. 2 and 4), however, in the present embodiment, since it is housed in the cooling oil sealing wall portion 57, the rotating electric machine 1 can be downsized by shortening the coil end portion and the like. Further, as shown in FIG. 2, a power supply ring or a connection ring 30 that has a bad influence on the flow 28 of the cooling oil in the related art.
However, in the present embodiment, since the cooling oil is enclosed in the cooling oil sealing wall portion 57, the flowability of the cooling oil flow 67 is improved as shown in FIG. 13, and the efficiency of the rotary electric machine 1 can be improved. Becomes

[Brief description of drawings]

FIG. 1 is a schematic perspective view of an automobile equipped with a rotating electric machine according to an embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional view of the rotary electric machine shown in FIG.

FIG. 3 is an enlarged cross-sectional view taken along the line BB of FIG.

FIG. 4 is an enlarged view of a main part of FIG.

5 is a diagram showing the first embodiment of the present invention and is a cross-sectional view of a portion equivalent to FIG.

6 is a cross-sectional view showing a modified example of FIG.

FIG. 7 is a sectional view showing another modification of FIG.

FIG. 8 is a cross-sectional view showing still another modified example of FIG.

9 is a view showing a second embodiment of the present invention and is a cross-sectional view of a portion equivalent to FIG.

FIG. 10 is a cross-sectional view showing a modified example of FIG.

FIG. 11 is a sectional view showing another modification of FIG. 9.

FIG. 12 is a cross-sectional view showing still another modified example of FIG.

FIG. 13 is a vertical cross-sectional view of a rotary electric machine showing a third embodiment of the present invention.

14 is an enlarged cross-sectional view taken along the line CC of FIG.

15 is an enlarged cross-sectional view taken along the line EE of FIG.

16 is an enlarged cross-sectional view taken along the line DD of FIG.

17 is an enlarged cross-sectional view taken along the line FF of FIG.

FIG. 18 is a perspective view of a main part of the power supply ring shown in FIGS.

[Explanation of symbols]

1 ... rotating electric machine 14 ... Stator core 12a ... Front cover 12b ... rear cover 15 ... Case 15a ... Case body 17a, 17b ... Seal ring 18, 19 ... Coil end chamber 20 ... End cap 21 ... Coil (winding) 22 ... Underplate 23 ... Cooling oil sealing wall (sealing wall) 23a ... Sealing resin layer 24 ... Stator 27 ... slot 36, 40, 45, 50 ... Ribs 39, 44, 46, 47 ... Boundary surface 51, 52, 53 ... Boundary surface 57 ... Cooling oil sealing wall (sealing wall) 58 ... Ribs 59 ... Metal ring 61 ... Sealing resin layer

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) // H02K 1/20 H02K 1/20 ZF term (reference) 5H002 AD02 AD04 AE06 5H603 AA13 AA15 BB01 BB12 CA01 CA05 CA10 CB02 CB03 CB11 CC11 CD02 CD04 CD21 CD28 CE01 CE05 5H605 AA01 BB05 BB17 DD13 5H609 BB12 BB19 PP02 PP06 PP08 PP09 QQ05 QQ12 RR26 RR36 RR42 RR51 RR67 SS07

Claims (7)

[Claims] 1. A stator core in which a slot having an opening on the inner peripheral surface side is formed along the axial direction, end caps arranged on both axial end faces of the stator core, and a stator core including the end cap has an axial shaft. The winding is wound in the axial direction to be accommodated in the slot, the under plate disposed near the opening of the slot, and the slot opening on the inner peripheral side of the under plate are closed. The sealing resin layer that forms a cooling passage inside the slot is formed integrally with the sealing resin layer and protrudes from the end caps at both ends of the stator core to surround the winding end portion with the case. A sealed wall portion that forms a coil end chamber, and a cooling liquid flows through the cooling passage and the coil end chamber. A cooling structure for a stator in a rotating electric machine in which at least windings are forcibly cooled by forming a rib that abuts the end cap while projecting in the diametrical direction of the stator core, at the base of the sealing wall. A cooling structure for a stator in a rotating electric machine, characterized by: 2. The rib and the end cap are respectively brought into contact with each other with a surface perpendicular to a wall surface of the sealing wall portion and a surface parallel thereto.
A cooling structure for a stator in the rotating electric machine according to [1]. 3. The rib and the end cap have two surfaces, a surface parallel to a wall surface of the sealing wall portion and a surface parallel to the wall surface of the sealing wall portion, and another surface located on the outer peripheral side of the wall surface of the sealing wall portion. The cooling structure for a stator in a rotating electric machine according to claim 2, wherein the cooling structures are in contact with each other. 4. The sealing wall portion is formed as a two-layer structure of a ring and a sealing resin layer integrated with the ring, and a diameter of the stator core is formed in a portion of the dense ring corresponding to a root portion thereof. The cooling structure for a stator in a rotating electric machine according to claim 1, wherein a rib that abuts against the end cap while protruding in a direction is formed. 5. The rib and the end cap are configured to come into contact with each other with a surface perpendicular to a wall surface of the sealing wall portion and a surface parallel thereto.
A cooling structure for a stator in the rotating electric machine according to [1]. 6. The rib and the end cap have two surfaces, a surface parallel to a wall surface of the sealing wall portion and a surface parallel to the wall surface, and another surface located on the outer peripheral side of the wall surface of the sealing wall portion. The cooling structure for a stator in a rotating electric machine according to claim 5, wherein the cooling structures are in contact with each other. 7. The cooling structure for a stator in a rotating electric machine according to claim 6, wherein the ring is a power supply ring for connecting windings individually housed in a plurality of slots.