JP6877315B2 - Cooling structure of rotary electric machine - Google Patents

Description

The present invention relates to a cooling structure of a rotary electric machine. In particular, the present invention relates to a liquid-cooled rotary electric machine cooling structure in which a stator coil is cooled by a coolant.

Rotating electric machines are used in a variety of applications, including electric vehicles and hybrid vehicles. A rotary electric machine is also called a motor generator or the like, and can operate as a motor that converts electric power into electric power or as a generator that converts electric power (rotational force) into electric power. The structure of a rotary electric machine is generally a structure composed of a rotor having a built-in permanent magnet and rotatably provided, and a stator provided so as to surround the rotor. The mutual conversion of electric power and power is performed by the interaction between the stator coil provided on the stator and the permanent magnet.

Since the stator coil generates heat when an electric current flows, it is cooled. In rotary electric machines used in automobiles and the like, a technique has been developed in which oil or the like is poured over a stator coil to cool the coil in liquid form.
For example, in Patent Document 1, in the cooling structure of a motor, a plurality of ejection holes are provided in a pipe member through which a cooling liquid flows, and the ejection holes in which the distance until the ejected liquid is applied to the coil end becomes longer are provided at the same distance. Disclosed is a technique for arranging the coolant closer to the source of the coolant than the shorter ejection holes. According to this technique, the range in which the refrigerant is applied at the coil end can be widened, and the coil end can be cooled efficiently.

Further, Patent Document 2 provides a technique in which a discharge hole is provided in the upper part of an oil pipe, a pair of guide ribs are provided in a case of a rotary electric machine, and oil discharged from the upper discharge hole is guided above the coil by a guide rib. Is disclosed. According to this technique, the pressure of the coolant can be easily adjusted, and the cooling performance of the rotary electric machine can be improved.

Japanese Unexamined Patent Publication No. 2016-134972 Japanese Unexamined Patent Publication No. 2011-193642

As the output of rotary electric machines has increased, it has become necessary to further improve the cooling performance, but even in the prior art, it has become desirable to more effectively cool the coil with a coolant. It was. In particular, it has become desired to accurately supply the coolant to the coil located away from the coolant pipe.

An object of the present invention is to provide a rotary electric machine capable of accurately supplying the coolant and effectively cooling the stator coil located at a position separated from the coolant supply pipe in the circumferential direction of the rotary electric machine. To provide a cooling structure.

As a result of diligent studies, the inventor integrated the guide member that guides the discharged coolant into the coolant supply pipe, and discharged the coolant in the circumferential direction of the rotary electric machine to apply the coolant to the surface of the guide member. It was found that the above problem can be solved by changing the direction of the flow of the coolant by using a plurality of flow changing portions that flow along the guide member and are dispersed and arranged at positions separated from the coolant supply pipe of the guide member. And completed the present invention.

The present invention cools a rotary electric machine including a rotor rotatable around an axis, a stator core provided on an outer peripheral portion of the rotor so as to surround the rotor, and a stator having a stator coil wound around the stator core. A coolant having a structure, which is provided so as to extend in the axial direction of the rotor and has a conduit through which the coolant flows and at least one or more discharge holes for discharging the coolant to the stator coil. A supply pipe is provided, and a guide member integrated with the coolant supply pipe is provided. The guide member has a surface extending along the circumferential direction of the rotary electric machine, and is provided from at least a part of the discharge hole. , The cooling liquid is discharged in the direction along the circumferential direction of the rotary electric machine when viewed along the axial direction, and the cooling liquid discharged from the discharge hole flows along the surface of the guide member, and the guide member is cooled. A plurality of flow changing portions are arranged in an axially dispersed position at a position separated from the liquid supply pipe, so that the cooling liquid flowing along the surface of the guide member is directed toward the stator coil by the flow changing portion. It is a cooling structure of a rotating electric machine to be guided (first invention).

In the first invention, preferably, a plurality of flow changing portions are provided on the guide member so that the distance between the flow changing portion and the coolant supply pipe is different (second invention). Further, in the first invention, preferably, the cooling liquid discharged from the discharge hole flows so as to diffuse in the axial direction along the surface of the guide member (third invention). Further, in the first invention, preferably, the flow changing portion has an arc shape erected from the surface, and the center of the arc is arranged on the discharge hole side with respect to the arc (fourth invention). Further, in the first invention, preferably, a part of the flow changing portion facing the discharge hole side is formed in a slope shape (fifth invention).

According to the cooling structure of the rotary electric machine (first invention) of the present invention, even for the stator coils arranged at positions separated from the coolant supply pipe in the circumferential direction of the rotary electric machine, the stator coils are cooled at a plurality of locations in the rotor axial direction. The liquid can be supplied accurately and cooled effectively.

Further, according to the second invention, the cooling liquid can flow to a plurality of places separated in the circumferential direction, and the cooling becomes more efficient. Further, as in the third invention, cooling can be efficiently performed even if the number of discharge holes is reduced. Further, according to the fourth invention and the fifth invention, the cooling liquid that has passed through the flow changing portion can be concentratedly directed to a specific portion of the coil, and the cooling efficiency can be further improved.

It is sectional drawing which shows the embodiment of the cooling structure of the rotary electric machine which concerns on this invention. It is a perspective view which shows the 1st Embodiment of the coolant supply pipe which integrated the guide member. It is sectional drawing which shows 1st Embodiment of the coolant supply pipe which integrated with the guide member. It is sectional drawing which shows the mode that the discharged coolant is guided to the stator coil by the 1st Embodiment of the coolant supply pipe which integrated the guide member. It is a perspective view which shows the mode that the discharged coolant is guided by the 1st Embodiment of the coolant supply pipe which integrated the guide member. It is a perspective view which shows the 2nd Embodiment of the coolant supply pipe which integrated the guide member. In the second embodiment of the coolant supply pipe in which the guide member is integrated, it is a figure which shows how the coolant discharged from a discharge hole diffuses and flows along a guide member. It is a perspective view which shows the 3rd Embodiment of the coolant supply pipe which integrated the guide member. It is a perspective view which shows the 4th Embodiment of the coolant supply pipe which integrated the guide member. It is a perspective view which showed the mode that the coolant discharged from a discharge hole is guided in the 4th Embodiment of the coolant supply pipe which integrated the guide member.

Hereinafter, embodiments of the present invention will be described by taking a rotary electric machine (motor generator) used in a hybrid vehicle as an example with reference to the drawings. The invention is not limited to the individual embodiments shown below, and the embodiments can be modified and implemented.

FIG. 1 is a cross-sectional view showing an embodiment of a cooling structure for a rotary electric machine according to the present invention. The rotary electric machine includes a rotatable rotor 91 and a stator 94 arranged around the rotor. When this rotary electric machine is used in an automobile, the rotating shaft of the rotor is connected to a drive mechanism such as a transmission of the automobile, and it is used as a motor (motor) that generates a driving force by electric power, or the rotational force is converted into electric power. It is configured to act as a converting generator.

A permanent magnet is attached to the rotor 91 and is rotatably supported around a rotation axis m by a case (not shown) of a rotary electric machine. The rotary electric machine may be of a type that does not use a permanent magnet in the rotor 91.

The stator 94 includes a plurality of stator cores 92, 92 arranged side by side on the outer peripheral portion of the rotor so as to surround the outer circumference of the rotor 91, and a stator coil wound around the respective stator cores 92, 92 (hereinafter, also simply referred to as “coil”). ) 93, 93. The stator 94 is fixed inside the case of the rotary electric machine. Further, in the stator 94, the coils are exposed at both ends of the rotating shaft m, and these portions are called coil ends.

Inside the case, a coolant supply pipe 11 is provided so as to preferably pass between the case and the stator 94. The coolant supply pipe 11 is provided so as to extend substantially parallel to the rotation axis m of the rotor. The coolant supply pipe 11 is a pipe body provided with a conduit through which the coolant flows. The coolant supply pipe 11 has at least one discharge hole for discharging the coolant to the stator coil 93.

The coolant supply pipe 11 is integrated with the guide member 12 as will be described later, and as shown in the YY cross section of FIG. 1, the guide member 12 has a posture in which the guide member 12 extends in the circumferential direction of the rotary electric machine. Then, the coolant supply pipe 11 and the guide member 12 are attached. The number and arrangement of the coolant supply pipes 11 are not particularly limited, but it is preferable that the coolant is arranged so as to face the upper side, the diagonally upper side, and the lateral side of the coil 93 so that the discharged coolant flows by gravity to cool the coil. ..

The coolant is collected and pressurized by a pump or the like, and is supplied to the coolant supply pipe 11 through a pipeline or the like provided in the case. The coolant discharged from the discharge hole 13 of the coolant supply pipe 11 is applied to the coil end, and the coil is cooled as it flows downward along the coil. The discharged coolant is collected at the lower part of the case and circulates to cool the coil. The coolant is typically oil. It is preferable to equip the circulation path of the coolant with an oil cooler or the like for cooling the coolant.

As shown in the XX cross section of FIG. 1, the stator coil 93 is exposed on both sides of the rotation axis m with respect to the stator core 92, and these portions are shown as coil ends 93a and 93b. The coolant discharged from the coolant supply pipe 11 is typically applied to the coil ends 93a and 93b to mainly cool this portion. A discharge hole may be provided in the coolant supply pipe at the intermediate portion between the coil ends 93a and 93b on both sides, that is, the portion of the stator core 92, and this portion may also be cooled by the coolant.

Although not essential, the coolant supply pipe 11 may be divided in the axial direction. For example, a portion that supplies the cooling liquid to the coil end 93a located on one end side of the rotating shaft and a portion that supplies the cooling liquid to the coil end 93b located on the other end side of the rotating shaft are provided separately, and both are provided separately. It may be connected to form a series of pipelines. Further, in the coolant supply pipe 11, it is preferable that the end portion on the side opposite to the side on which the coolant is supplied is closed as in the present embodiment, but this is not essential and other pipes. It may be connected to a road or the like.

In the cooling structure of the rotary electric machine according to the present invention, a guide member 12 is provided in addition to the coolant supply pipe 11. As shown in FIGS. 2 and 3, the guide member 12 is integrated with the coolant supply pipe 11, and becomes the coolant supply member 1 in a form in which a plate-shaped member is integrated with the pipe body. , Provided in the cooling structure. It is preferable that the guide member 12 and the coolant supply pipe 11 are integrated by integral molding using injection molding of resin.

The form of the guide member 12 will be described. The guide member 12 extends along the circumferential direction of the rotary electric machine in the vicinity of the connection portion 12a with the coolant supply pipe 11. That is, the guide member 12 has a surface 12P extending along the circumferential direction of the rotary electric machine in the vicinity of the connecting portion 12a with the coolant supply pipe 11. As will be described later, when the coolant is discharged from a part of the discharge holes 13 provided in the coolant supply pipe 11 in the direction along the circumferential direction of the rotary electric machine when viewed along the axial direction, the coolant is discharged from the discharge holes 13. The discharged coolant flows along the surface 12P of the guide member 12.

A plurality of flow changing portions 17a and 17b are arranged on the guide member 12 at positions separated from the coolant supply pipe in the circumferential direction of the rotary electric machine so as to be dispersed in the axial direction. The coolant flowing along the surface 12P of the guide member 12 is guided toward the stator coil 93 by the flow changing portions 17a and 17b.

In the present embodiment, the guide member is bent or curved in the direction toward the stator coil 93 toward the end of the guide member 12 in the circumferential direction of the rotary electric machine to form a slope, and this portion is formed into a slope shape. Corresponds to 17b. In the present embodiment, in the vicinity of the connection portion 12a with the coolant supply pipe 11, the guide member is provided in a flat plate shape extending in the circumferential direction of the rotary electric machine, and at the distal end portion of the guide member 12 in the circumferential direction. The guide member is divided in the axial direction, and each end is curved toward the center of the rotary electric machine, that is, the direction in which the coil or rotor is present. Although not essential, it is preferable that the flow changing portions 17a and 17b of the guide member 12 are provided so that their end portions extend substantially along the radial direction of the rotary electric machine.

Further, although not essential, in the present embodiment, some flow changing portions 17a and 17a are provided at positions farther from the coolant supply pipe 11 in the circumferential direction than the other flow changing portions 17b and 17b. There is. That is, in the present embodiment, the plurality of flow changing portions 17a and 17b are provided so that the distances between the flow changing portions and the coolant supply pipe 11 are different. In this way, the coolant can be efficiently supplied to a plurality of positions different in the axial direction and the radial direction (that is, the circumferential direction of the rotary electric machine) of the coolant supply pipe.

Although not essential, the guide member 12 is preferably provided in a plate shape in order to facilitate placement in a narrow space. The guide member may have a hollow box shape. Further, it is preferable that the guide members are provided on both sides of the coolant supply pipe 11 as is the case with the coolant supply member 1 of the present embodiment.

The discharge hole provided in the coolant supply pipe 11 will be described. The coolant supply pipe 11 is provided with a discharge hole for discharging the coolant supplied to the inside of the pipe through the inside and outside of the pipe body. At least a part of the discharge holes is provided so that the coolant is discharged in the direction along the circumferential direction of the rotary electric machine when viewed along the rotation axis direction of the rotor. Such a discharge hole is hereinafter referred to as a "first discharge hole 13". In the present embodiment, as shown in FIG. 3, when viewed along the direction in which the coolant supply pipe 11 extends, in the direction from the center of the pipe along the circumferential direction of the rotary electric machine (that is, the left-right direction in FIG. 3). , The first discharge holes 13, 13 are opened. Further, although not essential, in the present embodiment, the first discharge holes 13 and 13 are opened in the direction orthogonal to the extending direction of the coolant supply pipe 11 when viewed along the radial direction of the rotary electric machine. There is.

As shown in FIGS. 4 and 5, the coolant discharged from the first discharge holes 13 and 13 flows along the surfaces 12P of the guide members 12 and 12 and is changed in direction by the flow changing portions 17a and 17b. It is guided to the stator coil (coil ends 93a, 93b). In the present embodiment, the curved slope-shaped portions of the flow changing portions 17a and 17b efficiently direct the flow direction of the coolant toward the coil end. In FIGS. 4 and 5, the flow of the discharged coolant is indicated by a white arrow. The same applies to the illustration of the flow of the coolant.

Further, although not shown in the present embodiment, the coolant supply pipe 11 has a discharge hole (which discharges oil directly toward the stator coil as a conventionally known coolant supply pipe has. Hereinafter, it may also have a "second discharge hole"). The second discharge hole is opened in the direction from the center of the pipe toward the coil 93 (typically, the radial direction of the rotary electric machine) when viewed along the direction in which the coolant supply pipe 11 extends. The coolant discharged from the second discharge hole is directly applied to the coil ends 93a and 93b to cool the coil.

A method of manufacturing the coolant supply member 1 constituting the cooling structure of the rotary electric machine of the above embodiment will be described. The rotary electric machine and other constituent members may be procured by a known structure and a known manufacturing method.

Although not essential, the coolant supply member 1 having the above structure can be manufactured by, for example, injection molding of a thermoplastic resin.
In the manufacturing method using injection molding, the conduit through which the coolant flows in the portion of the coolant supply pipe 11 may be formed by a core mold or by a so-called floating core method. Depending on the shape, a pipe may be opened by a drill after injection molding. Further, after the half-cracked bodies are injection-molded, the half-cracked bodies may be welded together to form a coolant supply pipe 11 having a pipeline through which the coolant flows.

If possible, the discharge holes (first discharge hole 13, second discharge hole) are preferably formed by using a pin, a slide mold, or the like when the pipe body 11 is injection-molded, but by a drill or the like. It may be post-processed to make a discharge hole.

It is preferable that the guide member 12 and the flow changing portions 17a and 17b are integrally molded with the coolant supply pipe 11 by using injection molding, but it is not essential to integrally mold the coolant supply pipe 11 and the guide member. 12 and the flow changing portions 17a and 17b may be formed independently and assembled to manufacture the coolant supply member 1.
Further, the material constituting the coolant supply pipe 11, the guide member 12, and the flow changing portions 17a and 17b is not limited to the synthetic resin that can be injection-molded, and may be a metal or the like. In the case of metal, the coolant supply member 1 may be manufactured by using a known processing method such as welding, caulking, or cutting.

The operation and effect of the cooling structure of the rotary electric machine of the above embodiment will be described. According to the cooling structure of the above embodiment, the guide member 12 has a surface 12a extending along the circumferential direction of the rotary electric machine, and is axially oriented from at least a part of the discharge holes (first discharge hole 13). The cooling liquid is discharged in the direction along the circumferential direction of the rotary electric machine, and the cooling liquid discharged from the discharge hole 13 flows along the surface 12a of the guide member, and the cooling liquid is sent to the guide member 12. A plurality of flow changing portions 17a and 17b are arranged at positions separated from the supply pipe 11, and the cooling liquid flowing along the surface 12a of the guide member is directed toward the stator coil 93 by the flow changing portions 17a and 17b. Therefore, the coolant can be accurately supplied to the portion of the stator coil arranged at a position separated from the coolant supply pipe 11 in the circumferential direction of the rotary electric machine, and effective cooling can be performed.

Further, since the plurality of flow changing portions 17a and 17b are provided so as to be dispersed in the axial direction, the coolant can be accurately guided to a plurality of locations different in the axial direction with respect to the stator coil, and the cooling efficiency can be improved. Is enhanced.

In the prior art described in Patent Document 1, the refrigerant is also injected obliquely from the pipe member when viewed along the axial direction, and the refrigerant is also supplied to a position away from the pipe member. However, when an attempt is made to supply the refrigerant to a position distant from the pipe member in the circumferential direction by the technique of Patent Document 1, the refrigerant is supplied and supplied at an angle (sleeping angle) considerably inclined with respect to the outer peripheral surface of the stator coil. The inventors have discovered that the generated refrigerant bounces off the outer peripheral surface of the stator coil, making it difficult for the refrigerant to enter the inside of the coil, and the refrigerant cannot be efficiently delivered to the coil located at a position distant from the pipe member in the circumferential direction. ..

Further, in the prior art described in Patent Document 2, the oil discharged from the protruding hole at the upper part of the oil pipe is dropped onto the upper part of the coil by the guide rib provided on the case or the like. However, in the prior art of Patent Document 2, the oil discharged from the protruding hole at the upper part of the oil pipe diffuses in various directions and cannot be concentratedly flowed to the target location. The inventors have discovered the problem that the cooling efficiency of the coil is low.

According to the cooling structure of the rotary electric machine according to the above embodiment of the present invention, the coolant discharged from the first discharge holes 13 and 13 in the circumferential direction of the rotary electric machine is along the surface 12a of the guide member 12. It flows and is guided toward the coil by the flow changing portions 17a and 17b distributed in the axial direction. Therefore, the coolant discharged from the first discharge holes 13 and 13 is not dissipated so much, and the efficiency is set at a position separated from the coolant supply pipe 11 in the circumferential direction of the rotary electric machine (the position where the flow changing portion is provided). Can be sent. Moreover, according to the present invention, the cooling liquid can be accurately guided to a plurality of locations different in the axial direction, and the cooling efficiency can be improved. By such an action, the stator coils 93 and 93 can be effectively cooled while increasing the utilization efficiency of the discharged coolant. Further, since the coolant can be efficiently sent to a position separated from the coolant supply pipe 11 in the circumferential direction of the rotary electric machine, the number of coolant supply pipes to be arranged may be reduced.

When the flow changing portions 17a and 17b are formed in a slope shape as in the first embodiment, the coil can be efficiently specified by utilizing the force of the cooling liquid flowing along the surface 12a of the guide member 12. The flow can be changed toward the site, the dissipation of the coolant is suppressed, and the efficiency of cooling is further improved.

Further, as in the first embodiment, if a plurality of flow changing portions 17a and 17b are provided on the guide member so that the distances between the flow changing portions 17a and 17b and the coolant supply pipe 11 are different. With one coolant supply pipe, the coolant can be accurately supplied to the coil in a matrix shape dispersed in both the axial direction and the circumferential direction at a larger number of locations in the circumferential direction of the rotary electric machine. Therefore, in this case, the required number of coolant supply pipes may be further reduced.

The invention is not limited to the above embodiment, and can be implemented with various modifications. Other embodiments of the invention will be described below, but in the following description, parts different from the above-described embodiments will be mainly described, and detailed description of similar parts will be omitted. Moreover, these embodiments can be carried out by combining some of them with each other or replacing some of them.

In the description of the above embodiment, it has been described that the guide member 12 has a surface 12P extending along the circumferential direction of the rotary electric machine, but the extending direction of the surface 12P of the guide member and the circumferential direction of the rotary electric machine Do not have to be exactly the same, and it is sufficient that the coolant discharged from the first discharge hole along the circumferential direction flows substantially along the wall surface of the guide member.

Further, in the description of the above embodiment, it has been described that the first discharge hole 13 is provided so that the coolant is discharged in the direction along the circumferential direction of the rotary electric machine, but the discharge direction of the coolant and the rotary electric machine The circumferential direction does not have to be exactly the same, and the coolant discharged from the first discharge hole may generally flow in the circumferential direction of the rotary electric machine when viewed along the axial direction. The allowable angle between the two is preferably 30 degrees or less, more preferably 15 degrees or less.

Further, the specific shapes of the first discharge holes 13 and 13 are not particularly limited. The shape of the contour of the hole may be circular, rectangular, semicircular, semi-circular, or the like. Although not essential, the positions where the first discharge holes 13 and 13 are provided are, as shown in FIG. 3, near the position from the center of the body of the coolant supply pipe 11 toward the circumferential direction of the rotary electric machine. Is preferable. Further, the direction in which the first discharge holes 13 and 13 penetrate the pipe wall of the coolant supply pipe 11 is preferably a direction along the circumferential direction of the rotary electric machine as shown in FIG. Further, although not essential, from the viewpoint of centrally supplying the cooling liquid from the flow changing portions 17a and 17b to the specific parts of the coil, as in the present embodiment, the flow changing portions 17a and 17b are supplied. It is preferable that the first discharge holes 13 and 13 are provided so as to be associated with each other, and the coolant discharged from the first discharge holes 13 is concentrated in a beam shape and reaches the flow changing portions 17a and 17b. ..

Further, in the description of the above-described embodiment, the embodiment in which the flow changing portions 17a and 17b of the guide member have a curved slope shape has been described, but it is not essential that the guide members are curved, and the flow changing portions 17a and 17b are not essential. May be in a bent form. In the case of the bent form, the bending angle is preferably 60 degrees or less so that the flow of the discharged coolant is not easily blocked. Further, when the flow changing portions 17a and 17b are provided in a bent slope shape, it is preferable that the flow changing portions 17a and 17b are not bent at a large angle at a time, but are bent little by little at a plurality of places.

Further, the end portions (end portions on the coil side) of the flow changing portions 17a and 17b preferably have an angle formed by the end portions of the flow changing portions 17a and 17b and the radial direction of the rotary electric machine when viewed along the axial direction. It is preferable that the temperature is 40 degrees or less, more preferably 25 degrees or less. As in the above embodiment, it is particularly preferable that the end portions of the flow changing portions 17a and 17b extend substantially along the radial direction of the rotary electric machine. By doing so, the coolant can be easily applied so as to bend and flow at the curved portions of the flow changing portions 17a and 17b and reach the inner part of the coil from the end portions of the flow changing portions 17a and 17b, and the coolant can be used. More efficient. Such a configuration is particularly preferable when the coolant supply member 1 is provided diagonally above or sideways (side surface) instead of directly above the coil of the rotary electric machine.

FIG. 6 is a perspective view showing the coolant supply member 2 of the second embodiment in which the guide members 22, 22 and the flow changing portions 27a, 27b are integrated with the coolant supply pipe 21. Also in this embodiment, the coolant discharged from the first discharge holes 23, 23 in the circumferential direction of the rotary electric machine flows along the surface of the guide member 22, and flows in the direction toward the coil end by the flow changing portions 27a, 27b. The point to be derived is the same as that of the first embodiment. Similarly, a plurality of flow changing portions 27a and 27b are provided on the guide member 22 so that the distance between the flow changing portion and the coolant supply pipe 21 is different.

In the first embodiment, the first embodiment is that the flow changing portions 27a and 27b have an arc shape erected from the surface of the guide member, and the center of the arc arc is arranged on the discharge hole side with respect to the arc. It is different from the form. That is, in the present embodiment, the respective flow changing portions 27a and 27b are erected on the guide member in a shape in which the cylinder is halved along the surface along the central axis, and the half-split open side ( The side corresponding to the center of the arc of the arc) is provided so as to face the discharge holes 23, 23.

According to the flow changing portions 27a and 27b having such a configuration, as shown in FIG. 7, the coolant flowing along the surface of the guide member is efficiently collected and concentrated toward the coil. This makes it possible to cool a specific part of the coil more efficiently.

Further, in the present embodiment, the first discharge holes 23, 23 are provided in an elongated hole shape, and as shown in FIG. 7, the cooling liquid flowing from the first discharge holes 23, 23 is a guide member 22. It flows so as to diffuse in the axial direction along the surface of the. In order to facilitate the diffusion of the flow, as shown in FIG. 7, it is preferable that the first discharge hole is provided so as to expand from the inside to the outside of the pipe wall of the coolant supply pipe.

If the cooling liquid flowing from the first discharge holes 23, 23 flows so as to diffuse in the axial direction along the surface of the guide member 22 as in the present embodiment, the number of the first discharge holes can be reduced while reducing the number of the first discharge holes. It becomes possible to flow the coolant to a larger number of places in the axial direction. Therefore, the coil can be efficiently cooled while reducing the number of the first discharge holes, that is, reducing the processing cost and the manufacturing cost for providing the first discharge holes.

FIG. 8 is a perspective view showing the coolant supply member 3 of the third embodiment in which the guide members 32, 32 and the flow changing portions 37, 37 are integrated with the coolant supply pipe 31. In the present embodiment, the flow changing portions 37, 37 have an inclined surface that guides the cooling liquid flowing from the first discharge hole 33 along the surface of the guide member 32 toward the coil. The inclined surfaces of the flow changing portions 37, 37 are provided in a slope shape at an angle that bends with respect to the surface of the guide member 32.

On the inclined surfaces of the flow changing portions 37, 37, as in the present embodiment, the flow direction of the coolant flowing along the surface of the guide member 32 also changes in the axial direction of the coolant supply pipe 31. , The normal line of the inclined surface may be provided so as to be inclined with respect to the radial direction of the coolant supply pipe 31 when viewed along the radial direction of the rotary electric machine. When this is done, the range in which the coolant can be delivered to the coil can be made wider, which is more preferable in improving the cooling performance of the coil.

FIG. 9 shows the coolant supply member 4 of the fourth embodiment in which the guide members 42, 42 and the flow changing portions 47, 47 are integrated with the coolant supply pipe 41. In the present embodiment, the flow changing portions 47, 47 formed in a columnar shape are arranged apart in the axial direction, while the circumferential end portion 42b of the guide plate 42 is curved in the direction toward the coil. Has been done.

As in the present embodiment, the flow changing portion may be columnar, and even in such a configuration, as shown in FIG. 10, the cooling liquid flowing from the first discharge holes 43, 43 along the guide member 42 can be generated. By colliding with the flow changing portions 47 and 47, the flow changes toward the coil at that location, and the coil can be efficiently cooled even at a position away from the coolant supply pipe 41.

Further, when the end portion 42b of the guide member is curved in the direction toward the coil as in the present embodiment, a part of the flow of the coolant from the first discharge holes 43 and 43 is formed in the flow changing portion 47. , 47 will reach the end 42b of the guide member without hitting, and will be supplied toward the coil at that portion. Even with such a configuration, it is preferable that the coolant can be supplied to the coil at a plurality of locations in the circumferential direction of the rotating device.

In the second to fourth embodiments shown in FIGS. 6 to 10, the specific description of the second discharge hole is omitted as in the first embodiment, but also in these embodiments, the first A second discharge hole may be provided as in the embodiment.

Further, in order to control the flow of the cooling liquid flowing along the surface of the guide member, a groove is formed on the surface of the guide member, and the cooling liquid discharged from the discharge hole flows along the groove and is guided to the stator coil. You may be able to do it. The groove is preferably formed along the direction from the coolant supply pipe to the end of the guide member so as not to obstruct the flow of the coolant. When the guide member is a plate-shaped member, a groove may be formed by forming the guide member in a corrugated plate shape. Alternatively, a plurality of ribs may be provided on the surface of the guide member so that the portion between the ribs becomes a groove.

Further, in the description of the above-described embodiment, the detailed description of the mounting portion and the fixing portion has been omitted with respect to the coolant supply member in which the coolant supply pipe and the guide member are integrated. Further, the details of the connection portion between the coolant supply pipe and other pipe lines and the pipe line closing member, etc. are also omitted. For these, known techniques may be used. Further, a seal portion may be appropriately provided for the connection portion such as the pipeline.

The application of the cooling structure of the rotary electric machine of the above embodiment is not limited to the rotary electric machine used in the hybrid vehicle, and has a rotatable rotor and a stator provided on the outer periphery thereof, and the stator coil is cooled by a coolant. It can be widely used in applications where electric machines are used. For example, such rotary electric machines can also be used in electric vehicles, industrial power motors, power generation equipment, and the like.

The cooling structure of the rotary electric machine of the above embodiment can be used for cooling a motor generator used in, for example, a hybrid vehicle, and has high industrial utility value.

1 Coolant supply member 11 Coolant supply pipe 12 Guide member 13 First discharge holes 17a, 17b Flow changing part 91 Rotor 94 stator 92 stator core 93 stator coil

Claims (5)

A cooling structure for a rotary electric machine including a rotor that can rotate around an axis, a stator core provided on an outer peripheral portion of the rotor so as to surround the rotor, and a stator having a stator coil wound around the stator core. ,
A coolant supply pipe provided so as to extend in the axial direction of the rotor and having a conduit through which the coolant flows and at least one discharge hole for discharging the coolant to the stator coil is provided.
A guide member integrated with the coolant supply pipe is provided.
The guide member has a surface extending along the circumferential direction of the rotary electric machine.
A coolant is discharged from at least a part of the discharge holes in a direction along the circumferential direction of the rotary electric machine when viewed along the axial direction, and the coolant discharged from the discharge holes is along the surface of the guide member. flow,
A plurality of flow changing portions are arranged in the guide member at positions separated from the coolant supply pipe in an axially dispersed manner.
The coolant flowing along the surface of the guide member is guided toward the stator coil by the flow changing portion.
Cooling structure of rotary electric machine. A plurality of flow changing portions are provided on the guide member so that the distance between the flow changing portion and the coolant supply pipe is different.
The cooling structure for a rotary electric machine according to claim 1. The coolant discharged from the discharge hole flows so as to diffuse in the axial direction along the surface of the guide member.
The cooling structure for a rotary electric machine according to claim 1. The cooling structure for a rotary electric machine according to claim 1, wherein the flow changing portion has an arc shape erected from the surface, and the center of the arc is arranged on the discharge hole side with respect to the arc. A part of the flow changing part facing the discharge hole side is formed in a slope shape.
The cooling structure for a rotary electric machine according to claim 1.

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