JP2014236613A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine capable of improving a sealing property of a coolant channel when a stator is fitted, in a housing having the coolant channel opening in an axial direction.SOLUTION: An electric motor equipped with a cylindrical body portion 14 and a front cover, is provided with a stator fixed in the body portion 14, and a rotor fixed in the inside of the stator so as to integrally rotate with a rotation shaft. The body portion 14 is formed with a coolant channel 23 opening to one side in an axial direction and extending in a circumferential direction. The opening on the one side of the coolant channel 23 is covered by the front cover. The body portion 14 is formed with a coolant inlet 26 and a coolant outlet 27. An interface is provided between the stator and the body portion 14, and a gasket is interposed between an end portion on the opening side of the body portion 14 and the front cover. In the coolant channel 23, a pin member 30 is provided so as to form an orifice portion for communicating a part of the coolant channel 23. The pin member 30 is formed as a different member from the body portion 14.

Description

  The present invention relates to a rotating electrical machine.

In the rotating electrical machine (motor) for a vehicle disclosed in Patent Document 1, a motor case including an inner cylinder that holds a stator and an outer cylinder that forms a flow path for flowing cooling water between the inner cylinder and the like is disclosed. Has been. The flow path extends in the circumferential direction and is formed at a position corresponding to the stator. The motor case is formed with a water supply port for supplying the refrigerant to the flow path and a drain port for discharging the refrigerant from the flow path. Between the water supply port and the drain port, an orifice portion that narrows the channel width of the channel is formed.
The motor case is formed by casting. The outer cylinder is provided with a plurality of sand removal holes. In order to form a cavity corresponding to the flow path in the motor case, a core (sand mold) fitted into a mold is used. After inserting the core into the mold and pouring and melting the molten metal, the core sand is extracted from the sand hole and the sand hole is sealed with a lid to form the motor case.

  On the other hand, the liquid-cooled rotating electrical machine disclosed in Patent Document 2 includes a substantially cylindrical housing, and a stator and a rotor housed in the housing. The stator is formed by winding a stator coil around a stator iron core, and is fitted to the inner periphery of the housing by shrink fitting or press fitting. The housing is provided with an annular flow path so as to surround the outer peripheral side of the stator, and the axial rear end of the annular flow path is exposed and opened at the rear end face of the housing. A cooling passage is formed by closing the open end of the housing with a bracket. Here, when the outer peripheral portion is the outer cylinder portion and the inner peripheral portion is the inner cylinder portion with respect to the cooling passage in the housing, the stator is fitted inside the inner cylinder portion by shrink fitting or press fitting. Will be. Note that the sealing of the cooling passage is maintained by interposing a seal between the open end of the housing and the bracket. The cooling passage is divided in the circumferential direction by a partition wall formed in the axial direction. The partition wall is integrally formed with the housing by a die casting method.

JP 2010-41835 A JP 2004-364429 A

  However, in the rotating electrical machine (motor) for a vehicle disclosed in Patent Document 1, after inserting a core into a mold and pouring and melting the molten metal, the core sand is extracted from the sand hole, The motor case is cast by sealing the hole with a lid. Since the motor case is cast by such a complicated process, there is a problem in terms of productivity, and the manufacturing cost increases.

  On the other hand, in the liquid-cooled rotating electrical machine disclosed in Patent Document 2, a housing having a cooling passage and a partition wall can be integrally formed by a die casting method, so that productivity can be improved and manufacturing cost can be reduced. The partition wall (corresponding to a boundary wall of the present invention described later) is a configuration necessary for regulating the flow of the refrigerant in the circumferential direction. However, since the stator is fitted inside the inner cylinder part by shrink fitting or press fitting, the axial displacement amounts in the outer cylinder part and the inner cylinder part are not uniform, and the outer cylinder part and the inner cylinder There is a risk that the flatness of each end face (open end side of the housing) of each part may be deteriorated (the difference in axial position depends on the position in the circumferential direction). As a result, there is a problem that the surface pressure of the seal interposed between the end face of the outer cylinder part and the end face of the inner cylinder part and the bracket becomes non-uniform, and the sealing performance of the cooling passage is lowered.

  The present invention has been made in view of the above problems, and an object of the present invention is to improve the sealing performance of the refrigerant flow path when the stator is fitted in a housing having a refrigerant flow path that opens in the axial direction. It is in the provision of a rotating electrical machine that can be achieved.

  In order to solve the above-described problems, the invention according to claim 1 is a housing including a cylindrical main body and a lid that covers an end surface of the main body, a stator fixed in the housing, and the stator. A rotor that is provided on the inner side and is fixed to the rotary shaft so as to be integrally rotatable. The main body is formed with a refrigerant channel that opens in an end surface on one side in the axial direction and extends in the circumferential direction. In addition, the opening of the refrigerant flow path is closed by the lid portion, a refrigerant inlet for supplying the refrigerant to the refrigerant flow path, and a refrigerant outlet for discharging the refrigerant from the refrigerant flow path are provided in the main body portion. A fastening margin is set between the stator and the main body, a seal member is interposed between the opening side end surface of the main body and the lid, and the refrigerant flow in the refrigerant flow path Between the inlet and the refrigerant outlet, the refrigerant flow path Part boundary wall is provided to form a communication passage for communicating, said boundary wall, characterized in that it is formed by a separate member and the main body portion.

  According to the first aspect of the present invention, since the fastening margin is provided between the stator and the main body, the stator can be fitted and fixed to the main body using, for example, shrink fitting. it can. At this time, the boundary wall is formed of a separate member from the main body, so that the outer peripheral portion is the outer cylinder portion with respect to the refrigerant flow path in the main body portion, and the inner peripheral portion is the inner cylindrical portion. Variations in the axial displacement amounts of the end surfaces on the opening side of the outer tube portion and the inner tube portion can be suppressed, and flatness can be ensured. Even if there is a step in the axial direction between the end surfaces on the opening side of the outer cylinder part and the inner cylinder part, the seal surface pressure at the time of fastening can be made constant by adjusting the bead height of the seal member as appropriate. Is possible. Therefore, it is possible to improve the sealing performance of the refrigerant flow path when the stator is fitted to the housing (main body portion).

  According to a second aspect of the present invention, in the rotating electrical machine according to the first aspect, the communication path is provided at an axial position corresponding to the stator.

  According to invention of Claim 2, a stator can be efficiently cooled with the refrigerant | coolant which distribute | circulates a communicating path.

  According to a third aspect of the present invention, in the rotating electrical machine according to the first or second aspect, the boundary wall is integrally formed with the lid portion.

  According to the third aspect of the present invention, the fitting of the boundary wall integrally formed with the lid portion to the main body portion is caused by the deformation of the main body portion due to the fitting, rather than the case where the boundary wall is directly fitted to the main body portion. Can be suppressed. That is, when the boundary wall is fitted to the main body portion by press-fitting or the like, there is a risk that the main body portion is deformed by press-fitting or the like, but when the boundary wall is integrally formed with the lid portion, The fitting can be a loose fitting, and the deformation of the main body due to the fitting can be suppressed.

  According to a fourth aspect of the present invention, in the rotating electric machine according to any one of the first to third aspects, the boundary wall is formed of an elastic member.

  According to the fourth aspect of the present invention, the work of attaching the boundary wall to the housing can be easily performed.

  ADVANTAGE OF THE INVENTION According to this invention, in the housing which has a refrigerant | coolant flow path opened to an axial direction, it is possible to aim at the improvement of the sealing performance of a refrigerant | coolant flow path in case a stator is fitted.

It is sectional drawing which shows the cross section of the electric motor which concerns on embodiment of this invention. (A) is a front view of the main-body part of the housing which concerns on embodiment of this invention, (b) is the sectional view on the AA line in (a). (A) is a top view of the gasket which concerns on embodiment of this invention, (b) is the BB sectional drawing in (a). (A) shows the state before fitting the stator to the main body according to the embodiment of the present invention, and (b) shows the state after fitting the stator to the main body. It is a schematic diagram for demonstrating the displacement of the main-body part accompanying the shrink fitting which concerns on embodiment of this invention. It is a graph which shows the displacement of the main-body part accompanying the shrink fitting which concerns on embodiment of this invention. (A) is a front view of the main-body part of the housing which concerns on a comparative example, (b) is CC sectional view taken on the line in (a).

(Embodiment of the present invention)
Hereinafter, an electric motor as a rotating electrical machine according to an embodiment of the present invention will be described with reference to FIGS.
An electric motor 10 shown in FIG. 1 includes a housing 11, a stator (stator) 12 fixed in the housing 11, and a rotor (rotor) provided inside the stator 12 and fixed to a rotary shaft 19 so as to be integrally rotatable. 13).
The direction corresponding to the left-right direction in FIG. 1 is referred to as “axial direction”, the left side in FIG. 1 is referred to as “one side”, and the right side in FIG.
In the present embodiment, one side in the axial direction is referred to as “front side”, and the other side in the axial direction is referred to as “rear side”.

  The housing 11 includes a cylindrical main body 14, a front cover 15 that covers the front end of the main body 14, and a rear cover 16 that covers the rear end of the main body 14. The front cover 15 corresponds to a lid part.

The stator 12 is fixed to the inner peripheral surface of the main body portion 14 by winding a stator coil 18 around the stator core 17. The stator coil 18 is supplied with three-phase alternating current from a drive circuit (not shown).
The rotor 13 includes a rotating shaft 19 and a plurality of magnetic cores 20 fitted to the rotating shaft 19. A bearing 21 is fixed to the center of the front cover 15, and a bearing 22 is fixed to the center of the rear cover 16. The rotary shaft 19 is supported by the bearings 21 and 22, and the rotor 13 is rotatably supported inside the stator 12. The rotor 13 is rotationally driven by an electric current supplied to the stator 12 in the stator 12. In the present embodiment, the rotor 13 uses a permanent magnet type in which permanent magnets are embedded, but other types of rotors such as an induction type and a reluctance type may be used.
A front end portion of the rotating shaft 19 protrudes outside the housing 11, and a gear (not shown) is fitted to the front end portion and is operatively connected to an external load via the gear.

  As shown in FIG. 1, the main body portion 14 is formed with a coolant channel 23 that opens to the front side, which is one side in the axial direction, and extends in the circumferential direction. The refrigerant flow path 23 is formed in an annular shape so as to surround the stator 12. The axial front end 23A, which is the front end in the axial direction of the refrigerant flow path 23, is open, whereas the axial rear end, which is the rear end in the axial direction of the refrigerant flow path 23. 23B is blocked. The refrigerant flow path 23 is formed such that the axial rear end 23B of the refrigerant flow path 23 is in an axial position corresponding to the rear end of the stator core 17 of the stator 12 fixed to the main body 14. Has been.

  The main body 14 is manufactured by die casting. Die-casting is a casting method in which molten metal is injected into a mold at high pressure. A fixed mold and a movable mold are combined to form a cavity corresponding to the shape of the main body 14, and an aluminum alloy is formed in the cavity. It is formed by injecting molten metal such as light metal. The refrigerant flow path 23 has a tapered shape from the front side in the axial direction to the rear side in the axial direction so that the movable mold can be easily removed from the fixed mold after the molten metal is injected.

  As shown in FIG. 1, the outer peripheral portion of the main body 14 with respect to the refrigerant flow path 23 is referred to as an outer cylindrical portion 24, and the inner peripheral portion thereof is referred to as an inner cylindrical portion 25. A stator core 17 of the stator 12 is fixed to the inner peripheral side of the inner cylinder portion 25. By the way, as shown in FIG. 4A, there is a tightening allowance between the outer diameter d1 of the stator core 17 and the inner diameter d2 of the inner peripheral surface of the inner cylinder portion 25 that fixes the stator core 17. Δd is provided, and there is a relationship of Δd = d1−d2. Using this tightening allowance Δd, as shown in FIG. 4B, the stator core 17 is fitted and fixed to the inner cylindrical portion 25 by, for example, shrink fitting. 4A shows a state before the stator core 17 is fitted to the inner cylindrical portion 25, and FIG. 4B shows a state after the stator core 17 is fitted to the inner cylindrical portion 25. Show. 4A and 4B show only one side with respect to the center line f. The outer cylinder part 24 and the inner cylinder part 25 are separated into an inner peripheral side and an outer peripheral side on the front side, and are connected on the rear side.

As shown in FIG. 2B, a front end face 24 </ b> A is formed on the opening end face of the outer cylinder portion 24, and a front end face 25 </ b> A is formed on the opening end face of the inner cylinder portion 25.
As shown in FIGS. 2A and 2B, a refrigerant flow for supplying refrigerant to the refrigerant flow path 23 is provided at the rear end, which is the other axial side of the outer cylinder portion 24 of the main body portion 14. An inlet 26 and a refrigerant outlet 27 for discharging the refrigerant from the refrigerant flow path 23 are formed. The refrigerant inlet 26 and the refrigerant outlet 27 are formed at adjacent positions. The refrigerant inlet 26 and the refrigerant outlet 27 are connected to, for example, an external coolant circulation device (not shown).
As the refrigerant, for example, LLC (Long Life Coolant) can be used.

  As shown in FIGS. 2 (a) and 2 (b), a plurality of projecting portions 28 projecting in the outer diameter direction are provided in the circumferential direction at the front end, which is one axial side of the outer cylinder portion 24. Are formed at predetermined intervals, and screw holes 29 are formed in the protrusions 28.

As shown in FIGS. 2 (a) and 2 (b), a countersink hole 31 is formed in a region adjacent to the refrigerant inlet 26 between the refrigerant inlet 26 and the refrigerant outlet 27 in the refrigerant channel 23. Is formed. The counterbore 31 is formed from the opening side (front side) of the refrigerant flow path 23 toward the rear side in the axial direction. The countersink hole 31 has a diameter larger than the radial width of the refrigerant flow path 23, and the outer cylinder part 24 and the inner cylinder part 25 are formed with cutouts 31 </ b> A and 31 </ b> B having arcuate cross sections. The axial length m of the counterbore 31 is formed to be smaller than the axial length of the refrigerant flow path 23.
A cylindrical pin member 30 is fitted and fixed in the counterbore 31. The pin member 30 corresponds to a boundary wall provided in the refrigerant flow path 23 and is formed of a separate member from the main body portion 14.

  The pin member 30 is made of, for example, aluminum, and is molded and fixed to the counterbore 31 after the main body portion 14 is formed by die casting. The axial length of the pin member 30 is formed to be equal to the axial length m of the counterbore 31. By fitting and fixing the pin member 30 to the counterbore 31, the refrigerant flow path 23 is divided by the pin member 30, but at a position on the back side (rear side) from the pin member 30, FIG. As shown in FIG. 2, the orifice portion 32 is formed. That is, the pin member 30 is inserted into the refrigerant flow path 23 so as to form an orifice portion 32 as a communication path that communicates a part of the refrigerant flow path 23. The orifice portion 32 is provided at an axial position corresponding to the stator 12.

  As indicated by arrows in FIG. 2A, most of the refrigerant that has flowed into the refrigerant flow path 23 from the refrigerant inlet 26 passes through the refrigerant flow path 23 (clockwise refrigerant flow path 23) other than the orifice portion 32. After circulation, the refrigerant is discharged to the outside through the refrigerant outlet 27. If the refrigerant flow flowing in the clockwise direction is F1, the refrigerant flow F1 corresponds to the refrigerant flow in the main flow path. On the other hand, a part of the refrigerant flowing into the refrigerant flow path 23 from the refrigerant inlet 26 flows through the refrigerant flow path 23 (counterclockwise refrigerant flow path 23) passing through the orifice portion 32, and then passes through the refrigerant outlet 27. It is discharged outside. If the flow of the refrigerant circulating in the counterclockwise direction is F2, the refrigerant flow F2 corresponds to the refrigerant flow in the sub flow channel.

As shown in FIG. 1, a gasket 33 as a seal member is disposed between the front end face 24 </ b> A of the outer cylinder part 24 and the front end face 25 </ b> A of the inner cylinder part 25 and the front cover 15. The front cover 15 is fastened to the main body 14 via the gasket 33. As a result, the sealing performance of the refrigerant flow path 23 is improved.
The front cover 15 is formed with a plurality of protrusions 34 protruding in the outer diameter direction at predetermined intervals in the circumferential direction, and through holes 35 are formed in the protrusions 34.
The front cover 15 may be manufactured by die casting or may be formed by cutting.

As shown in FIGS. 3 (a) and 3 (b), the gasket 33 has a concentric shape with respect to the rotating shaft 19, an outer peripheral side portion 36 formed on the outer peripheral side and having a predetermined width in the radial direction, The inner peripheral side part 37 which is formed inside the outer peripheral side part 36 and has a predetermined width in the radial direction, and a connecting portion 38 for connecting the outer peripheral side part 36 and the inner peripheral side part 37 are provided.
A bead (projection) 36 </ b> A is formed in the radially central portion of the outer peripheral side portion 36. A bead (projection) 37 </ b> A is formed at the center in the radial direction of the inner peripheral portion 37. Each of the beads 36A and the beads 37A is formed concentrically. If the height of the bead 36A is h1 and the height of the bead 37A is h2, the heights h1 and h2 are set to appropriate values so that the seal surface pressure is constant at the time of fastening. In this embodiment, it is set so that h1 <h2. The gasket 33 is made of a metal plate-like spring member.

As shown in FIG. 3A, a plurality of protrusions 36B protruding in the outer diameter direction are formed in the outer circumferential side portion 36 at predetermined intervals in the circumferential direction, and the protrusions 36B have through holes. 36C is formed.
As shown in FIGS. 5 and 1, a gasket 33 is disposed between the front end face 24A of the outer cylinder portion 24 and the front end face 25A of the inner cylinder portion 25 and the front cover 15, and the bead 36A and the front end face 24A face each other. 37A and the front end face 25A are arranged so as to face each other. Then, the through hole 35, the through hole 36 </ b> C, and the screw hole 29 are aligned, and a bolt (not shown) is inserted to fasten the front cover 15 to the screw hole 29 of the main body 14 via the gasket 33.
The rear cover 16 is disposed so as to contact the rear end surface of the main body 14 and is fixed to the main body 14 with a bolt (not shown). The rear cover 16 may be manufactured by die casting or may be formed by cutting.

The operation of the electric motor 10 having the above configuration will be described.
As shown in FIGS. 4A and 4B, the stator core 17 of the stator 12 is fitted and fixed to the inner peripheral side of the inner cylinder portion 25 by shrinkage fitting using a fastening allowance Δd. The shrink fitting means that the main body portion 14 is heated to expand the inner peripheral surface (the hole portion having the inner diameter dimension d2) of the inner cylinder portion 25, and the stator core 17 (the outer diameter dimension d1) is expanded. This is performed by fitting the inner peripheral surface of the main body 14 and cooling the main body 14. As a result, the inner cylinder part 25 contracts, the stator core 17 is fastened by the inner peripheral surface of the inner cylinder part 25, and the stator core 17 is fastened to the inner cylinder part 25.
At this time, as shown in FIG. 5, due to thermal expansion of the outer cylinder part 24 and the inner cylinder part 25, the front end face 24 </ b> A of the outer cylinder part 24 and the front end face 25 </ b> A of the inner cylinder part 25 are displaced in the axial direction. That is, since the stator core 17 is shrink-fitted, the outer cylinder part 24 and the inner cylinder part 25 swell to the outer diameter side as a whole, and as a result, the axial positions of the front end faces 24A and 25A are displaced. The axial displacements with respect to the reference line S at this time are α and β, respectively. The reference line S indicates the axial position of the front end face 24A of the outer cylinder portion 24 and the front end face 25A of the inner cylinder portion 25 before performing shrink fitting.

  The horizontal axis is the circumferential angle (deg.) Indicating the circumferential position of the front end faces 24A, 25A when the cylindrical center of the outer cylinder portion 24 and the inner cylinder portion 25 is the center, and the vertical axis is the front end face 24A. 25A, the axial displacement amounts α and β of the outer cylinder portion 24 and the inner cylinder portion 25 are schematically shown in FIG. In the present embodiment, the axial displacement amount β of the inner cylinder portion 25 is indicated by a solid line, and the axial displacement amount α of the outer cylinder portion 24 is indicated by a broken line.

As a comparative example, as shown in FIGS. 7A and 7B, a case where a rib portion 41 as a boundary wall is integrally formed with the main body portion 40 is shown. The outer peripheral portion of the main body 40 with respect to the refrigerant flow path 45 is referred to as an outer cylindrical portion 42, and the inner peripheral portion thereof is referred to as an inner cylindrical portion 43. Further, as shown in FIG. 7B, the rib portion 41 is formed in a portion on the front side in the axial direction from the rear side in the axial direction, but there is a region that is not formed on the opening end portion side. An orifice portion 44 is formed.
In the graph shown in FIG. 6, the axial displacement amount of the inner cylinder portion 43 in the comparative example is represented by a one-dot chain line, and the axial displacement amount of the outer cylinder portion 42 is represented by a two-dot chain line. Moreover, the angle of the circumferential direction in which the rib part 41 is formed is shown by P. Further, the angle P is also an angle in the circumferential direction in which the pin member 30 is fitted and fixed.

  As shown in FIG. 6, the axial displacement amount β of the inner cylinder portion 25 and the axial displacement amount α of the outer cylinder portion 24 in the present embodiment show almost flat characteristics with little change due to the angle in the circumferential direction. Yes. This is because the pin member 30 as a boundary wall provided in the refrigerant flow path 23 is formed as a separate member from the main body portion 14, so that the space between the outer cylinder portion 24 and the inner cylinder portion 25 via the pin member 30 is reduced. This is because tensile stress does not act. Further, the axial displacement amount β of the inner cylinder portion 25 and the axial displacement amount α of the outer cylinder portion 24 are different in size, and the axial displacement amount β of the inner cylinder portion 25 is different from the axial direction of the outer cylinder portion 24. It is larger than the displacement amount α (α <β). Therefore, as shown in FIG. 5, the front end face 24 </ b> A of the outer cylinder portion 24 and the front end face 25 </ b> A of the inner cylinder portion 25 are substantially uniform in axial displacement. That is, fluctuations in the axial displacement amounts of the front end surfaces 24A and 25A of the outer cylinder portion 24 and the inner cylinder portion 25 can be suppressed. A step is formed between the front end face 24A of the outer cylinder portion 24 and the front end face 25A of the inner cylinder portion 25. The size of the step can be expressed by β−α.

On the other hand, as shown in FIG. 6, the axial displacement amount of the inner cylinder portion 43 and the axial displacement amount of the outer cylinder portion 42 in the comparative example vary greatly depending on the angle (position) in the circumferential direction. The amount of axial displacement is larger than the other angles, and has a characteristic of being convex upward. This is because the rib portion 41 as a boundary wall provided in the refrigerant flow path 45 is integrally formed with the main body portion 40, so that a tensile stress is exerted between the outer cylinder portion 42 and the inner cylinder portion 43 via the rib portion 41. The inner cylinder part 43 and the outer cylinder part 42 are largely deformed around the position of the angle P corresponding to the rib part 41. Therefore, the front end face of the outer cylinder part 42 and the front end face of the inner cylinder part 43 are non-uniform due to variations in axial displacement as compared with the embodiment.
Therefore, in this embodiment, the flatness of the front end face can be ensured as compared with the comparative example.

As shown in FIG. 5, a gasket 33 is interposed between the front end face 24 </ b> A of the outer cylinder portion 24 and the front end face 25 </ b> A of the inner cylinder portion 25 and the front cover 15. The outer peripheral side portion 36 of the gasket 33 is opposed to the front end surface 24A, the inner peripheral side portion 37 is opposed to the front end surface 25A, and the bead 36A and the protruding side of the bead 37A are arranged toward the rear side (or front side).
By the way, the height h1 of the bead 36A and the height h2 of the bead 37A are constant in sealing surface pressure at the time of fastening in consideration of the axial displacement amount α of the outer cylinder portion 24 and the axial displacement amount β of the inner cylinder portion 25. Each is set to an appropriate value. In this case, the height h2 is set larger than the height h1. Therefore, by fastening the front cover 15 to the main body 14 via the gasket 33, the seal surface pressure between the front cover 15 and the front end face 24A and between the front cover 15 and the front end face 25A becomes constant, and the seal of the refrigerant flow path 23 is achieved. Improves. Therefore, it is possible to suppress the deformation of the main body part 14 due to the fitting of the stator 12 (stator core 17) to the main body part 14 and improve the sealing performance.
In the embodiment shown in the comparative example, the axial displacement amount of each of the inner cylinder portion 43 and the outer cylinder portion 42 has a large difference depending on the circumferential angle (position with respect to the rib portion 41), and the seal surface pressure is constant. Even if it is going to do, it is very difficult to implement by adjusting the heights h1 and h2 of the beads 36A and the beads 37A as in this embodiment. Although it is conceivable to process the front end face, which is a sealing surface, after the stator is fitted, it is not realistic because cutting powder may enter the stator coil or the like.

As indicated by arrows in FIG. 2A, the refrigerant that has flowed into the refrigerant flow path 23 from the refrigerant inlet 26 flows through the main flow path indicated by the refrigerant flow F1, and is discharged to the outside through the refrigerant outlet 27. The
By the way, although heat is generated when current flows through the stator coil 18 of the stator 12, this heat is transmitted to the main body 14 via the stator core 17. And heat exchange is performed between the main-body part 14 and the refrigerant | coolant which recirculates the inside of the refrigerant | coolant flow path 23, the heat transmitted to the main-body part 14 moves to a refrigerant | coolant, and the stator 12 is cooled.
On the other hand, a part of the refrigerant flowing into the refrigerant flow path 23 from the refrigerant inlet 26 flows through the orifice portion 32 through the sub flow path indicated by the refrigerant flow F2, and is discharged to the outside through the refrigerant outlet 27. The Therefore, the stator 12 can be efficiently cooled by the refrigerant flowing through the orifice portion 32.

The electric motor 10 according to this embodiment has the following effects.
(1) Since a fastening allowance Δd is provided between the stator 12 (stator iron core 17) and the main body portion 14 for fixing the stator 12, the stator 12 is attached to the main body portion 14 by shrink fitting by using the fastening allowance Δd. It can be fitted and fixed. At this time, the pin member 30 serving as the boundary wall is formed of a separate member from the main body 14, so that the front end face 24 </ b> A of the outer cylinder 24 and the front end 25 </ b> A of the inner cylinder 25 in the main body 14 are respectively angled ( Since the amount of axial displacement due to the position is substantially the same, the axial position is substantially uniform. That is, each of the front end surfaces 24A and 25A can suppress variation in the amount of axial displacement, and ensure flatness. A step is generated in the axial direction between the front end face 24A of the outer cylinder portion 24 and the front end face 25A of the inner cylinder portion 25, but the bead 36A and the bead 37A are formed on the outer peripheral side portion 36 and the inner peripheral side portion 37 of the gasket 33. It is possible to make the seal surface pressure constant at the time of fastening by appropriately adjusting the heights h1 and h2. Therefore, it is possible to improve the sealing performance of the refrigerant flow path 23 when the stator 12 is fitted to the main body 14.
(2) Since the orifice portion 32 is provided at the axial position corresponding to the stator 12, the stator 12 can be cooled by the refrigerant flowing through the orifice portion 32.
(3) Since the axial length of the orifice portion 32 can be adjusted by adjusting the axial length of the pin member 30, the cross-sectional area of the orifice portion 32 can be adjusted. Therefore, it is possible to adjust the amount of the refrigerant flowing through the sub flow path formed by the orifice portion 32. That is, the distribution ratio of the refrigerant between the main channel and the sub channel can be adjusted.
(4) By having the sub-flow path formed by the orifice portion 32, the air that enters the refrigerant flow path 23 through the refrigerant inlet 26 and stays in the vicinity of the pin member 30 can be quickly discharged to the outside. It is possible to reduce the air remaining in the refrigerant flow path 23.
(5) Since the main body part 14 is formed with the refrigerant flow path 23 which is open on one side in the axial direction and extends in the circumferential direction, the main body part 14 provided with the refrigerant flow path 23 is formed by die casting. It can be molded and can be manufactured at low cost.

The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the spirit of the invention. For example, the following modifications may be made.
In the above embodiment, the pin member 30 is described as being formed as a separate member from the main body portion 14, but the pin member 30 may be integrally formed with the front cover 15. In this case, when the pin member 30 formed integrally with the front cover is fitted to the main body 14 rather than the case where the pin member 30 is directly fitted to the main body 14, the deformation of the main body 14 due to the fitting is improved. It can be suppressed. That is, when the pin member 30 is fitted into the main body portion 14 by press fitting or the like, there is a risk of causing deformation of the main body portion 14 due to press fitting or the like. However, when the pin member is integrally formed with the front cover, the pin member and the main body The fitting with the portion 14 can be a loose fitting, and the deformation of the main body portion 14 accompanying the fitting can be suppressed. Further, since the pin member is integrally formed with the front cover, the fitting of the pin member to the main body portion 14 and the assembly of the front cover can be performed simultaneously. Here, the integral formation includes a case where the front cover 15 and the pin member 30 are formed separately and the pin member 30 is integrally fixed to the front cover 15.
In the above embodiment, the pin member 30 is formed of a metal material such as aluminum. However, the pin member may be formed of an elastic member such as resin or rubber. In this case, the attaching operation of the pin member to the main body portion 14 can be easily performed. Further, the deformation of the main body portion 14 accompanying the attachment of the pin member to the main body portion 14 can be suppressed.
In the above embodiment, the pin member 30 has been described as having a columnar shape and fitted to the main body 14, but the shape of the pin member may be any shape such as a plate material, a square member, and a rod member. Moreover, you may attach to a main-body part with an adhesive agent, a volt | bolt, etc.
In the above embodiment, the stator core 17 has been described as being fitted and fixed to the inner cylinder portion 25 by shrink fitting as an example in which the allowance is set between the stator and the main body, but other than shrink fitting As a method, it may be formed by press-fitting or pushing. The present invention is applied to a fixing method in which the stator is fixed by tightening allowance and the inner cylinder portion is deformed.
In the above-described embodiment, the main body portion 14 is formed with the coolant channel 23 that is open on one side in the axial direction and extends in the circumferential direction, and the pin member 30 formed as a separate member from the main body portion 14. However, it may be formed as follows. That is, the main body portion is formed with a coolant channel that opens to the other side in the axial direction and extends in the circumferential direction, and a pin member formed of a separate member from the main body portion is fitted into the main body portion, and the main body portion A gasket may be interposed between the end face on the opening side and the rear cover. In this case, the rear cover corresponds to the lid.
In the above embodiment, the gasket 33 is used as the sealing member. However, an O-ring may be used instead of the gasket 33. O-rings having different specifications (inner diameter, wire diameter, etc.) are used for the outer cylinder portion 24 side and the inner cylinder portion 25 side. In this case, since an off-the-shelf product can be used, handling is easy.
In the above embodiment, since the front end faces 24A and 25A are in the same position in the axial direction before the stator 12 is fitted, the step β-α is produced after the stator 12 is fitted. In this case, the main body portion 14 may be molded in consideration of β-α (the axial positions of the front end faces 24A and 25A are shifted in advance) to eliminate the fitting step. Further, a step may be provided on the sealing surface of the front cover 15 facing in consideration of β-α.
In the above embodiment, the rotating electrical machine has been described as an electric motor, but the rotating electrical machine may be a generator.
In the above embodiment, the refrigerant is described as using LLC, but other than LLC, for example, AF (antifreeze), DLC (diesel coolant), water, and the like may be used.

10 Electric motor (rotary electric machine)
11 Housing 12 Stator 13 Rotor 14 Body 15 Front Cover (Cover)
17 Stator core 19 Rotating shaft 23 Refrigerant flow path 24 Outer cylinder part 25 Inner cylinder parts 24A, 25A Front end face (end face on the opening side)
26 Refrigerant inlet 27 Refrigerant outlet 30 Pin member (boundary wall)
32 Orifice section (communication path)
33 Gasket (seal member)
36A, 37A Bead Δd

Claims (4)

A housing having a cylindrical main body and a cover that covers an end surface of the main body, a stator fixed in the housing, and a rotor provided inside the stator and fixed to a rotation shaft so as to be integrally rotatable. Prepared,
The main body portion is formed with a refrigerant flow path that opens on one end face in the axial direction and extends in the circumferential direction, and the opening of the refrigerant flow path is blocked by the lid portion,
The main body is formed with a refrigerant inlet for supplying the refrigerant to the refrigerant flow path and a refrigerant outlet for discharging the refrigerant from the refrigerant flow path.
A tightening margin is set between the stator and the main body,
A seal member is interposed between the end face on the opening side of the main body part and the lid part,
A boundary wall is provided between the refrigerant inlet and the refrigerant outlet in the refrigerant channel so as to form a communication path that communicates a part of the refrigerant channel,
The rotating electric machine characterized in that the boundary wall is formed of a member separate from the main body.   The rotating electrical machine according to claim 1, wherein the communication path is provided at an axial position corresponding to the stator.   The rotating electrical machine according to claim 1, wherein the boundary wall is integrally formed with the lid portion.   The rotary electric machine according to claim 1, wherein the boundary wall is formed of an elastic member.

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