JP6929008B2 - Coolant supply pipe - Google Patents

Description

The present invention relates to a coolant supply pipe that supplies a coolant. In particular, the present invention relates to a coolant supply pipe that discharges a pressurized coolant flowing inside the pipe to the outside of the pipe through a discharge hole that communicates inside and outside the pipe.

A technique is known in which a cooling liquid such as oil is pressurized and supplied through a pipeline, ejected from a discharge hole, and the cooling liquid is applied to the cooling target to cool the cooling target. Such cooling technology is utilized in, for example, cooling of coils used in motors, automatic transmissions, gear machines, internal combustion engines, and the like.

For example, rotary electric machines that use such cooling technology are used in applications such as 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 a coolant such as oil is poured over a stator coil to cool the coil.
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 discloses a cooling device for a belt-type continuously variable transmission used in an automobile or the like, and a technique for setting the positions of discharge holes provided in a coolant supply pipe to specific positions on the upstream side and the downstream side. It is disclosed. According to this technique, the coolant can be discharged to a desired position even if the angle at which the discharge hole (nozzle tube) is provided is constant.

Japanese Unexamined Patent Publication No. 2016-134972 JP-A-2009-68681

The coolant discharged from the discharge hole of the coolant supply pipe may be discharged in a concentrated beam shape or may be discharged in a conical diffused form. The form of such discharge is generally determined by the supply pressure of the coolant, the discharge rate, the viscosity of the coolant, the diameter and length of the discharge hole, the tapered shape of the discharge hole, and the like. It may be desired that the coolant discharged from the individual discharge holes is discharged in a form in which the coolant is diffused so that the coolant can be supplied to a wider range.

It is also conceivable to mold the coolant supply pipe by injection molding of synthetic resin, but in that case, the coolant is efficiently supplied while the mold forming the pipe body and the discharge hole has a structure as simple as possible. It is required to manufacture a tube.

A first object of the present invention is to provide a coolant supply pipe capable of effectively cooling a wider range by discharging the coolant in a more diffused state from the discharge hole of the coolant supply pipe. A second object of the present invention is to efficiently manufacture such a coolant supply pipe by utilizing injection molding of a synthetic resin.

As a result of diligent studies, the inventor has found that the first object can be achieved by providing a partition plate having a specific form inside the discharge hole and partitioning the discharge flow paths into a plurality of discharge flow paths, and completes the present invention. rice field.

In the present invention, the pipe body provided with a pipeline through which the pressurized coolant flows is provided with a discharge hole for communicating the inside and outside of the pipe body and discharging the coolant to the outside of the pipe body . A coolant supply pipe for cooling an object to be cooled, which is arranged at a position away from the pipe body, by the discharged coolant , and the discharge hole is a cross section of a peripheral surface seen along the central axis of the discharge hole. The shape is circular or elliptical, and a flat plate-shaped partition plate is provided inside the discharge hole along the central axis of the discharge hole so that the inside of the discharge hole becomes a plurality of discharge flow paths. This is a coolant supply pipe in which the edge of the partition plate on the outer peripheral side of the pipe body reaches at least the outer peripheral surface of the pipe body with respect to the position in the direction along the central axis of the discharge hole (first invention).

In the first invention, preferably, the cross-sectional shape of the discharge hole is circular, the partition plate extends along the diameter of the discharge hole, and the discharge hole is partitioned into two discharge flow paths (second invention). .. Further, in the first invention, preferably, a plurality of partition plates are radially provided so as to reach the peripheral surface of the discharge hole from the center of the discharge hole, and the discharge holes are partitioned into three or more discharge flow paths (). Third invention). Further, in the second or third invention, preferably, the partition plate is provided over the entire length of the discharge hole, and the wall thickness of the partition plate is constant over the central axis direction of the discharge hole. Alternatively, the wall thickness decreases from the inside to the outside of the tubular body (fourth invention).

Further, in the first invention, preferably, the partition plate is provided so as to extend beyond the outer peripheral surface of the pipe body from the inside of the discharge hole to the outside of the pipe body (fifth invention).

According to the coolant supply pipe of the present invention (first invention), the coolant can be discharged from the discharge hole so that the coolant diffuses in a direction away from the partition plate, and a wide range can be effectively cooled. Further, according to the second invention and the third invention, the coolant can be diffused in a specific direction in the circumferential direction of the discharge hole, and the cooling can be performed more effectively. Further, when the coolant supply pipe of the fifth invention is used, the degree of diffusion of the coolant can be further increased.

Further, in the case of the coolant supply pipe of the fourth invention, the discharge holes and partition plates having excellent diffusion efficiency of the coolant can be easily manufactured by injection molding of synthetic resin using a mold having a simple structure. Therefore, the above-mentioned second purpose can be achieved.

FIG. 5 is a cross-sectional view showing an example in which the coolant supply pipe of the first embodiment according to the present invention is used in the cooling structure of a rotary electric machine. It is a perspective view which shows the coolant supply pipe of 1st Embodiment. It is a front view and sectional view which shows the structure of the discharge hole of the coolant supply pipe of 1st Embodiment. It is a schematic diagram for demonstrating the principle that the coolant discharged from the discharge hole of the coolant supply pipe of 1st Embodiment diffuses in a specific direction. It is a front view and the cross-sectional view which shows the form of diffusion of the coolant discharged from the discharge hole of the coolant supply pipe of 1st Embodiment. It is a front view which shows the structure of the discharge hole of the coolant supply pipe of 2nd Embodiment. It is a front view which shows the structure of the discharge hole of the coolant supply pipe of 3rd Embodiment. It is a front view and sectional drawing which shows the structure of the discharge hole of the coolant supply pipe of 4th Embodiment. It is a front view and sectional drawing which shows the structure of the discharge hole of the coolant supply pipe of 5th Embodiment.

Hereinafter, embodiments of the present invention will be described by taking as an example a coolant supply pipe used for cooling a rotary electric machine (motor generator) used in a hybrid vehicle 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 example in which the coolant supply pipe 1 of the first embodiment is used for the cooling structure of the rotary electric machine. 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 n 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, coils are exposed at both ends of the rotating shaft n, and these portions are called coil ends.

Inside the case, a coolant supply pipe 1 is provided so as to preferably pass between the case and the stator 94. The coolant supply pipe 1 is provided so as to extend substantially parallel to the rotation axis n of the rotor. The coolant supply pipe 1 has a pipe body 11 internally provided with a conduit through which the pressurized coolant flows. The coolant supply pipe 1 has at least one or more discharge holes 14, 14 for discharging the coolant to the stator coil 93 and the stator core 92. The discharge holes 14, 14 are through holes that communicate with each other inside and outside the pipe body 11. As shown in FIG. 2, the coolant supply pipe 1 of the present embodiment is provided with three discharge holes 14, 14 for the hollow pipe body 11. In FIG. 2, the extending direction of the central axis of the discharge hole 14 is indicated by the alternate long and short dash line m. The discharge holes 14 and 14 rotate in the direction from the center of the pipe toward the coil 93 (typically, when viewed along the direction in which the coolant supply pipe 1 extends, as shown in the YY cross section of FIG. It is vacant in the radial direction of the electric machine). The coolant supplied to the inside of the tubular body 11 in a pressurized state is discharged to the outside of the tubular body from the discharge holes 14 and 14, and is directly applied to the stator coil 93 and the stator core 92 to cool the stator.

The coolant is collected and pressurized by a pump or the like, and is supplied to the coolant supply pipe 1 through a pipeline or the like provided in the case. The coolant discharged from the discharge holes 14 and 14 and applied to the coil end cools the coil 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 shaft n with respect to the stator core 92, and these portions are shown as coil ends 93a and 93b. In the coolant supply pipe of the rotary electric machine, the discharged coolant is typically applied to the coil ends 93a and 93b to mainly cool this portion. As in the case of using the coolant supply pipe 1 of the present embodiment, the coolant supply pipe 1 is also provided with a discharge hole 14 in the intermediate portion between the coil ends 93a and 93b on both sides, that is, the stator core 92. , This part may also be cooled with a coolant.

Hereinafter, the detailed shape of the discharge hole 14 in the coolant supply pipe 1 of the first embodiment will be described with reference to FIG. The discharge holes 14 and 14 have a circular or elliptical cross-sectional shape of the peripheral surface when viewed along the central axis m of the discharge holes. In the present embodiment, the cross-sectional shape of the peripheral surface of the discharge hole 14 is circular. Further, the peripheral surface of the discharge hole 14 is preferably cylindrical or conical around the central axis m. In this embodiment, the discharge hole 14 has a cylindrical peripheral surface. In the case of a conical shape, it is preferable that the diameter increases from the inside to the outside of the tube.

Inside the discharge hole 14, a flat plate-shaped partition plate 15 is provided along the central axis m of the discharge hole. The inside of the discharge hole 14 is partitioned by the partition plate 15 so as to form a plurality of discharge flow paths. In the present embodiment, the partition plate 15 extends along the diameter of the discharge hole 14, and the discharge hole is partitioned into two discharge flow paths. Therefore, the cross-sectional shape of each of the two discharge flow paths is semicircular. That is, by integrating the partition plate inside the discharge hole, two through holes having a semicircular cross-sectional shape are provided in the pipe body.

The method of attaching the partition plate is not particularly limited, but as will be described later, it is preferable that the partition plate 15 is integrally molded with the pipe body 11.

As shown in the XX cross section and the ZZ cross section of FIG. 3, at least the outer peripheral surface of the pipe body with respect to the position of the edge 15a on the outer peripheral side of the pipe body of the partition plate 15 in the direction along the central axis m of the discharge hole. It has reached PO. In other words, the edge 15a on the outer peripheral side of the pipe body of the partition plate 15 is the same as the outer peripheral surface side of the pipe body (outer peripheral surface of the pipe body) of the discharge hole 14 with respect to the position in the direction along the central axis m of the discharge hole. It is located at a position, or the edge 15a is located outside the pipe body with respect to the peripheral edge (outer peripheral surface of the pipe body). In the present embodiment, the edge 15a on the outer peripheral side of the pipe body of the partition plate 15 coincides with the outer peripheral surface PO of the pipe body with respect to the position in the direction along the central axis m of the discharge hole. As in another embodiment (fourth embodiment, FIG. 8) described later, the end edge (45a) on the outer peripheral side of the pipe body of the partition plate (45) is a pipe with respect to the position in the direction along the central axis of the discharge hole. It may be located outside the outer peripheral surface PO of the body.

Further, although not essential, in the present embodiment, the end edge 15b of the partition plate 15 on the peripheral side of the tubular body coincides with the peripheral surface PI of the tubular body with respect to the position in the direction along the central axis m of the discharge hole. .. Preferably, as in the present embodiment, the partition plate 15 is provided over the entire length of the discharge hole 14 (the length in the direction along the central axis m). That is, the edge 15a on the outer peripheral side of the pipe body of the partition plate 15 coincides with the outer peripheral surface PO of the pipe body with respect to the position in the direction along the central axis m of the discharge hole, and the end edge on the peripheral side of the pipe body of the partition plate 15 It is preferable that 15b is aligned with the peripheral surface PI in the tube with respect to the position in the direction along the central axis m of the discharge hole.

Although not essential, the wall thickness t of the partition plate 15 is preferably constant over the central axis m of the discharge hole, or the wall thickness decreases from the inside to the outside of the pipe body 11. It is preferable that the partition plate 15 is provided. In the present embodiment, the wall thickness is constant over the central axis m direction. Further, the wall thickness of the partition plate is preferably 0.1D to 0.5D, more preferably 0.2D to 0.4D, where D is the diameter of the discharge hole 14.

In the coolant supply pipe 1 of the first embodiment, three discharge holes 14, 14 are provided in one pipe body 11. The number and position of the discharge holes can be adjusted as needed, and are not particularly limited. Although not essential, the coolant supply pipe 1 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 separately provided, and both are provided separately. It may be connected to form a series of pipelines to form a coolant supply pipe. Further, in the coolant supply pipe 1, the end portion on the side opposite to the side on which the coolant is supplied (the left end portion in the cross section XX of FIG. 1) is closed as in the present embodiment. It is preferable, but this is not essential and may be connected to another pipeline or the like. Further, when the end portion of the tubular body 11 opposite to the side to which the coolant is supplied is closed, a similar discharge hole may be provided at the end portion.

The material constituting the coolant supply pipe 1 may be a metal such as aluminum, and is not particularly limited, but a synthetic resin, particularly an injection-moldable thermoplastic resin is preferable. If the coolant supply pipe 1 is made of an injection-moldable thermoplastic resin, the partition plate 15 can be easily integrally molded with the pipe body 11, which is convenient.

The manufacturing method of the coolant supply member 1 of the said embodiment will be described.
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 of the tubular body 11 of the coolant supply pipe 1 flows may be formed by a core mold, and the tubular body 11 may be integrally molded into a pipe shape. Further, a set of half-cracked bodies to be the pipe body 11 is injection-molded, and then the half-cracked bodies are welded or adhered to each other to assemble into a hollow tubular body, and the pipe body 11 has a conduit through which the coolant flows. good.

The discharge hole 14 and the partition plate 15 are preferably formed by using a pin, a slide mold, or the like when the pipe body 11 is injection-molded. Typically, the cavity mold forming the outer peripheral surface of the pipe body 11 is configured to open in a direction orthogonal to the central axis of the pipe body 11, and the discharge hole 14 and the partition plate are formed in the cavity mold. A pin, a slide type, or the like having a shape for forming the 15 may be provided.

The operation and effect of the coolant supply pipe 1 of the above embodiment will be described.
In the coolant supply pipe 1 of the above embodiment, the cross-sectional shape of the peripheral surface of the discharge hole is circular or elliptical, and inside the discharge hole 14, a flat plate-shaped partition plate 15 is provided along the central axis m of the discharge hole. The inside of the discharge hole 14 is provided so as to form a plurality of discharge flow paths, and further, the edge 15a on the outer peripheral side of the pipe body of the partition plate 15 is in the direction along the central axis m of the discharge hole. Regarding the position, since it has a configuration that at least reaches the outer peripheral surface PO of the pipe body, as described below, the coolant is diffused in a direction away from the partition plate 15 when viewed along the central axis m. In addition, the coolant can be discharged from the discharge hole 14, and a wide range can be effectively cooled.

The operation when such a partition plate 15 is provided in the discharge hole 14 will be described. FIG. 4 shows a front view of mainly one of the two discharge flow paths of the discharge hole 14 as viewed along the central axis m, and a cross section ZZ. As described above, each discharge flow path has a semicircular cross-sectional shape. That is, by providing the flat plate-shaped partition plate 15 in the discharge hole having a circular cross section, the flow path of each semicircular cross section is surrounded by the cylindrical peripheral surface of the discharge hole 14 and the surface of the partition plate. Such a corner portion will be generated. In FIG. 4, the corner portion is shown as a region A surrounded by a broken line.

Since the coolant passing through the corner portion A passes through the region surrounded by the two surfaces, it is more susceptible to the wall surface than the other portions, and the viscosity of the coolant is strongly affected, so that the flow velocity of the coolant is high. Is slower than the other parts. Therefore, the dynamic pressure of the coolant at the corner portion A is higher than that at the other portions. As a result, the coolant passing through the corner portion A pushes the coolant passing through the other portion of the half-moon-shaped discharge flow path by dynamic pressure. As a result, the coolant discharged from the discharge flow path flows so as to be deflected in the direction indicated by the white arrow in FIG. The above action is surely generated when the edge 15a on the outer peripheral side of the pipe body of the partition plate 15 reaches at least the outer peripheral surface PO of the pipe body with respect to the position in the direction along the central axis m of the discharge hole.

Due to the above action, in the coolant supply pipe 1 of the first embodiment, as shown in FIG. 5, the coolant mainly diffuses in the normal direction of the partition plate 15, that is, moves away from the partition plate 15. It diffuses in the direction and is discharged. In FIGS. 4 and 5, the diffusion image of the discharged coolant is shown by a broken line. Then, the direction in which the coolant is diffused can be adjusted by adjusting the angle around the central axis m on which the partition plate 15 is provided. For example, if it is desired to diffuse the cooling liquid in the circumferential direction of the pipe body 11, the partition plate 15 may be provided along the extending direction of the pipe body 11 as in the embodiment shown in FIG. .. Alternatively, if it is desired to diffuse the cooling liquid in the extending direction of the tubular body 11, the partition plate 15 may be provided along the circumferential direction of the tubular body 11. The orientation of the partition plate may be selected and adjusted according to the cooling target to which the coolant supply pipe of the present embodiment is applied and the desired diffusion pattern.

Further, according to the coolant supply pipe 1 of the above embodiment, the coolant tends to be easily diffused in a predetermined direction, and the coolant tends to be difficult to diffuse in the other direction. Therefore, it is desired to apply the coolant intensively. It is possible to efficiently discharge the cooling liquid to the portion, while refraining from discharging the coolant to the other portion, and the efficiency of cooling can be improved.

Further, since the cooling liquid filled inside the pipe body 11 is continuously discharged from the discharge hole 14, the entrainment of air or the like in the discharge hole is small, and the bubbling of the discharged cooling liquid can be suppressed.

Further, in the coolant supply pipe 1 of the first embodiment, the cross-sectional shape of the discharge hole is circular, the partition plate extends along the diameter of the discharge hole, and the discharge holes are formed in the two discharge flow paths. Since the compartments are partitioned, as shown in FIG. 5, the coolant efficiently diffuses in two directions, but it becomes difficult to diffuse in the direction orthogonal to the coolant, so that the coolant is difficult to diffuse in a specific direction in the peripheral direction of the discharge hole. The coolant can be diffused and discharged intensively, and cooling can be performed more effectively.

Further, in the coolant supply pipe 1 of the first embodiment, the partition plate 15 is provided over the entire length of the discharge hole 14 (the length in the direction along the central axis m), and the meat of the partition plate 15 is provided. Since the thickness is constant over the central axis m direction of the discharge hole, or the wall thickness of the partition plate 15 decreases from the inside to the outside of the pipe body, such a coolant supply pipe 1 is simplified. It is easy to manufacture by injection molding of synthetic resin using a mold with a similar structure. That is, when the discharge hole or partition plate having such a configuration is formed by injection molding, the pin or slide type for forming the discharge hole 14 or partition plate 15 is a cavity type that forms the outer peripheral surface of the pipe body 11. The core type that can be provided on the side and forms the inner peripheral surface of the tubular body 11 does not substantially require undercut processing, and the core type has a simple structure (for example, a simple columnar core type). ).

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, the embodiment in which the partition plate is a flat partition plate along the radial direction and the central axis of the discharge hole has been described, but the specific shape of the partition plate is not limited thereto, and the partition plate is not limited thereto. Is a flat plate extending along the central axis of the discharge hole, the inside of the discharge hole is divided into a plurality of discharge flow paths, and the edge of the partition plate on the outer peripheral side of the pipe body is the central axis of the discharge hole. The same effect can be obtained with respect to the position in the direction along the above, as long as it reaches at least the outer peripheral surface of the pipe body.

6 and 7 show other examples of the partition plate provided in the discharge hole. Each of the embodiments shown in FIGS. 6 and 7 is the same as the first embodiment described with reference to FIGS. 2 to 5 except for the shape of the partition plate viewed along the central axis of the discharge hole. There is.

FIG. 6 shows that in the coolant supply pipe 2 of the second embodiment, the flat plate-shaped partition plates 25 and 25 are provided so as to gather in the discharge holes 24 provided in the pipe body 21. ing. In the present embodiment, the respective partition plates 25, 25 extend in a flat plate shape along the radial direction of the discharge hole and the central axis, and the three partition plates 25, 25 are near the central axis of the discharge hole. They are gathered together at, joined and integrated with each other, and are provided radially. The inside of the discharge hole 24 is divided into three discharge flow paths by such partition plates 25 and 25.

Also in the coolant supply pipe 2 of the second embodiment, in each discharge flow path, a portion (A) surrounded by the peripheral wall of the discharge hole and the surface of the partition plate, and a portion near the central axis where the partition walls gather (a portion). In B), the influence of the viscosity of the coolant becomes strong, the flow velocity of these portions decreases, and the dynamic pressure increases. Therefore, the coolant discharged from each discharge flow path diffuses in the direction indicated by the white arrow in the drawing, that is, in the direction away from the partition wall.

In the present embodiment, the partition walls 25 and 25 are provided in a three-pronged shape, and the discharge holes 24 are divided into three discharge flow paths. Therefore, the coolant is mainly supplied at three locations in the circumferential direction of the discharge holes. It is discharged from the discharge hole 24 in a three-pronged diffusion form (indicated by a broken line in the figure) so that it diffuses in (in the direction of the white arrow) and does not diffuse much in other places.

FIG. 7 shows that in the coolant supply pipe 3 of the third embodiment, the flat plate-shaped partition plates 35 and 35 are provided so as to gather in the discharge holes 34 provided in the pipe body 31. ing. In the present embodiment, the respective partition plates 35, 35 extend in a flat plate shape along the radial direction and the central axis of the discharge holes, and the four partition plates 35, 35 form a cross shape of the discharge holes. It gathers near the central axis, joins and integrates with each other, and is provided radially. The inside of the discharge hole 34 is divided into four discharge flow paths by such partition plates 35 and 35.

Also in the coolant supply pipe 3 of the third embodiment, in each discharge flow path, a portion (A) surrounded by the peripheral wall of the discharge hole and the surface of the partition plate, and a portion near the central axis where the partition walls gather (a portion). In B), the influence of the viscosity of the coolant becomes strong, the flow velocity of these portions decreases, and the dynamic pressure increases. Therefore, the coolant discharged from each discharge flow path diffuses in the direction indicated by the white arrow in the drawing, that is, in the direction away from the partition wall.

In the present embodiment, the partition walls 35 and 35 are provided in a cross shape, and the discharge holes 24 are divided into four discharge flow paths. Therefore, the coolant is mainly supplied at four locations in the circumferential direction of the discharge holes. It is discharged from the discharge hole 34 in a four-pronged diffusion form (indicated by a broken line in the figure) so that it diffuses in (in the direction of the white arrow) and does not diffuse much in other places.

When the partition wall is provided in a three-pronged shape or a cross shape as in these embodiments, the coolant may be concentratedly diffused in a specific place in the circumferential direction of the discharge hole and not so much in other places. The cooling liquid can be concentrated in those directions, and the efficiency of cooling can be improved.

FIG. 8 shows that in the coolant supply pipe 4 of the fourth embodiment, a flat plate-shaped partition plate 45 is provided in the discharge hole 44 provided in the pipe body 41. The present embodiment is different in that the partition plate 45 projects outward from the outer peripheral surface PO of the tubular body 41, and other points are the same as those of the first embodiment described with reference to FIGS. 2 to 5. .. That is, in the present embodiment, the partition plate 45 is provided so as to extend beyond the outer peripheral surface PO of the pipe body from the inside of the discharge hole to the outside of the pipe body.

Even in such an embodiment, the coolant can be diffused in the direction away from the partition plate 45. Further, since the end surface 45a of the partition plate 45 is located outside the pipe beyond the outer peripheral surface PO of the pipe body 41, that is, from the peripheral edge of the discharge hole 44, the partition plate of the extending portion. The internal pressure of the fluid acts on the partition plate, and the reaction causes the entire coolant to be discharged to be pushed away from the partition plate, so that the coolant can be diffused more effectively.

FIG. 9 shows that in the coolant supply pipe 5 of the fifth embodiment, a flat plate-shaped partition plate 55 is provided in the discharge hole 54 provided in the pipe body 51. In the present embodiment, the length of the partition plate 55 (the length in the direction along the central axis of the discharge hole) is shorter than the length of the discharge hole, and the peripheral surface of the discharge hole 54 on the outer peripheral side of the pipe is a conical surface. The difference is that the shape is the same as that of the first embodiment described with reference to FIGS. 2 to 5.

The length of the partition plate 55 is the pipe of the pipe body as long as the end edge 55a on the outer peripheral side of the pipe body of the partition plate 55 reaches at least the outer peripheral surface PO of the pipe body with respect to the position in the direction along the central axis of the discharge hole. It may be shorter than the wall thickness and can produce similar effects. That is, the end edge 55b on the peripheral side of the pipe body of the partition plate 55 may be located outside the peripheral surface PI of the pipe body with respect to the position in the direction along the central axis of the discharge hole.

Further, if the peripheral surface of the discharge hole 54 on the outer peripheral side of the pipe has a conical surface shape, particularly a conical surface shape in which the diameter increases from the inside to the outside of the pipe, the coolant is more diffused. It will be easier. The degree of the cone, that is, the angle formed by the conical surface and the central axis is preferably 60 degrees or less, preferably 45 degrees or less.

Further, the specific direction of the central axis m of the discharge hole is not particularly limited. Normally, the central axis m of the discharge hole is set in a direction orthogonal to the axis of the pipe body, but the central axis m of the discharge hole is obliquely intersected with the axis of the pipe body at an angle of less than 90 degrees. May be set.

The coolant supply pipe may be provided with other members, if necessary, in addition to the pipe body and the discharge hole. The tubular body may be provided with reinforcing ribs, or a guide plate for guiding the coolant may be provided integrally with the tubular body. Further, it is not necessary to provide a partition plate for all the discharge holes provided in the coolant supply pipe, and a partition plate may not be provided for some of the discharge holes.

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 pipe. 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. In addition, a seal portion may be provided as appropriate for the connection portion of the pipeline or the like.

The cooling target in which the coolant supply pipe of the above embodiment is used is not limited to the rotary electric machine used in a hybrid vehicle or the like, and can be widely used for a general rotary electric machine. For example, such rotary electric machines can also be used in electric vehicles, industrial power motors, power generation facilities, and the like. Further, the cooling target is not limited to the rotary electric machine, and the coolant supply pipe can be used for various purposes such as an automatic transmission, a gear mechanism, and an internal combustion engine. Further, the coolant used is not limited to oil, and may be any liquid, such as water or coolant.

The coolant supply pipe 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 pipe 11 Tube body 14 Discharge hole 15 Partition plate 91 Rotor 94 Stator 92 Stator core 93 Stator coil

Claims (5)

The pipe body provided with a pipeline through which the pressurized coolant flows is provided with a discharge hole that communicates the inside and outside of the pipe body and discharges the coolant to the outside of the pipe body, and is separated from the pipe body. It is a coolant supply pipe for cooling the object to be cooled, which is arranged at the specified position, by the discharged coolant.
The discharge hole has a circular or elliptical cross-sectional shape of the peripheral surface when viewed along the central axis of the discharge hole.
Inside the discharge hole, a flat plate-shaped partition plate is provided along the central axis of the discharge hole, and the inside of the discharge hole is partitioned so as to form a plurality of discharge flow paths.
The edge of the partition plate on the outer peripheral side of the tubular body reaches at least the outer peripheral surface of the tubular body with respect to the position in the direction along the central axis of the discharge hole.
Coolant supply pipe. The cross-sectional shape of the discharge hole is circular, the partition plate extends along the diameter of the discharge hole, and the discharge hole is divided into two discharge flow paths.
The coolant supply pipe according to claim 1. A plurality of partition plates are radially provided so as to reach the peripheral surface of the discharge hole from the center of the discharge hole, and the discharge holes are partitioned by three or more discharge flow paths.
The coolant supply pipe according to claim 1. The partition plate is provided over the entire length of the discharge hole, and is provided.
The wall thickness of the partition plate is constant along the central axis direction of the discharge hole, or the wall thickness decreases from the inside to the outside of the pipe body.
The coolant supply pipe according to claim 2 or 3. A partition plate is provided so as to extend beyond the outer peripheral surface of the pipe body from the inside of the discharge hole to the outside of the pipe body.
The coolant supply pipe according to claim 1.

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