Cooling oil supply pipe for rotating electric machine

Abstract

To provide a cooling oil supply pipe for a rotating electric machine, which can increase the spray angle of cooling oil.SOLUTION: A cooling oil supply pipe 10 for a rotating an electrical machine includes a pipe main body 20 extending a predetermined length and forming a flow path through which cooling oil flows, and the pipe main body 20 is formed with outlet holes 30, 31 which communicate with the flow path and spray cooling oil, and each of the outlet holes 30, 31 has an inlet opening 41 formed on the inner surface of the pipe main body 20, an outlet opening 43 formed on the outer surface of the pipe main body 20, and a circulation passage 45 which communicates with the inlet opening 41 and the outlet opening 43, and the outlet opening 43 is formed in such a manner that it has a larger opening width along the circumferential direction of the pipe main body 20 than the inlet opening 41.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a cooling oil supply pipe for a rotating electrical machine, for example, for supplying cooling oil for cooling a rotating electrical machine such as a motor. [Background technology]

[0002] For example, so-called rotating electric machines (rotating electrical machines) such as motors and reducers used in electric vehicles and hybrid vehicles have rotating parts, which means that some parts become hot. Therefore, cooling oil is sometimes supplied to cool these hot parts.

[0003] The following Patent Document 1 describes a cooling structure for a rotating electric machine including a stator core, a plurality of coils, and a coolant flow path through which a coolant flows that is arranged along the direction of the rotation axis of the stator core. The coolant flow path is formed in a pipe that extends a predetermined length along the direction of the rotation axis of the stator core.

[0004] The pipe has a plurality of holes (first hole, second hole, third hole, fourth hole) formed at predetermined positions thereof and communicating with the refrigerant flow path, and the refrigerant flowing through the refrigerant flow path is sprayed from the plurality of holes toward the coil. As shown in Fig. 6 of Patent Document 1, each hole is a through hole of a constant diameter formed by penetrating the peripheral wall of the pipe toward the radial center of the pipe (the axis of the pipe). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 5865215 Summary of the Invention [Problem to be solved by the invention]

[0006] As described above, each hole formed in the pipe in the cooling structure of Patent Document 1 is formed penetrating the peripheral wall portion of the pipe toward the radial center of the pipe, so the spray angle of the cooling oil cannot be made large.

[0007] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a cooling oil supply pipe for a rotating electrical machine, which is capable of increasing the spray angle of cooling oil. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the present invention provides a cooling oil supply pipe for a rotating electric machine that sprays cooling oil toward a rotating electric machine, the pipe body extending a predetermined length and forming a flow path through which the cooling oil flows, the pipe body is formed with an ejection hole that communicates with the flow path and ejects the cooling oil, the ejection hole has an inlet opening formed on the inner surface of the pipe body, an outlet opening formed on the outer surface of the pipe body, and a flow passage communicating with the inlet opening and the outlet opening, and the outlet opening is formed with an opening width along the circumferential direction of the pipe body larger than that of the inlet opening. Effect of the Invention

[0009] In the present invention, the outlet opening of the ejection hole is formed with a larger opening width along the circumferential direction of the pipe body than the inlet opening, so that the injection angle of the cooling oil can be made large and the cooling oil can be ejected over a wide area. [Brief description of the drawings]

[0010] [Figure 1] 1 is a perspective view showing a first embodiment of a cooling oil supply pipe for a rotating electrical machine according to the present invention; [Diagram 2] FIG. 2 is a side view of the cooling oil supply pipe for a rotating electrical machine. [Diagram 3] 3 is a cross-sectional view taken along the line AA in FIG. 2. [Figure 4] 3 is a cross-sectional perspective view taken along the line of arrow BB in FIG. 2. [Diagram 5] 1 is an enlarged cross-sectional view of a main portion of a cooling oil supply pipe for a rotating electrical machine according to the present invention; [Figure 6] 4 is an explanatory diagram showing a state in which the cooling oil supply pipe for a rotating electrical machine is used; FIG. [Figure 7] 5 is an explanatory diagram showing a form structure for forming the cooling oil supply pipe for a rotating electric machine according to the embodiment of the present invention; FIG. [Figure 8] FIG. 4 is an enlarged cross-sectional view of a main portion of a second embodiment of a cooling oil supply pipe for a rotating electrical machine according to the present invention. [Figure 9] FIG. 11 is an enlarged cross-sectional view of a main portion of a third embodiment of a cooling oil supply pipe for a rotating electrical machine according to the present invention. [Figure 10] FIG. 11 is an enlarged cross-sectional view of a main portion of a fourth embodiment of a cooling oil supply pipe for a rotating electrical machine according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] (First embodiment of a cooling oil supply pipe for a rotating electrical machine) Hereinafter, a first embodiment of a cooling oil supply pipe for a rotating electrical machine according to the present invention will be described with reference to Figs.

[0012] 6, this rotating electric machine cooling oil supply pipe 10 (hereinafter also simply referred to as "cooling pipe 10") is attached to a predetermined mounting member 1 and sprays cooling oil toward a rotating electric machine 5, which is an object to be cooled, thereby cooling a predetermined location of the rotating electric machine 5. Note that examples of the rotating electric machine 5 include motors, reducers, generators, etc. used in electric vehicles, hybrid vehicles, etc., but of course other machines may also be used.

[0013] 1 to 4, the cooling pipe 10 has a pipe body 20 that extends a predetermined length and has a flow path 21 (see FIG. 3) through which cooling oil flows, and the pipe body is formed with ejection holes that communicate with the flow path 21 and eject the cooling oil. In this embodiment, the ejection holes 30 consist of a first ejection hole 31 and a second ejection hole 30.

[0014] In this embodiment, the pipe body 20 has an outer circumferential surface 22 and an inner circumferential surface 23 each having a circular shape, and is generally cylindrical in shape and extends a predetermined length.

[0015] The axis of the pipe body 20, that is, the direction along the axial direction of the pipe body 20 (also referred to as the direction along the extension direction) and the point located at the radial center thereof is referred to as "axis C." The circumferential direction of the pipe body 20 is referred to as "circumferential direction R."

[0016] A blocking portion 24 is disposed at the tip end in the extension direction of the pipe body 20, and the tip end of the pipe body 20 is blocked. Also, as shown in Fig. 3, a cooling oil supply opening 25 (hereinafter, simply referred to as "supply opening 25") having a substantially circular shape is formed at the base end in the extension direction of the pipe body 20, and the base end of the pipe body 20 is open.

[0017] A supply hose, a supply pipe, or the like (not shown) is connected to the supply opening 25, and the cooling oil is supplied into the flow passage 21 through the supply opening 25 by the supply hose or the like.

[0018] 1 and 2, a mounting bracket 27 having a generally long plate shape protrudes from the base end side in the extension direction of the pipe body 20. A circular mounting hole 27a is formed at the tip of this mounting bracket 27. Then, by fixing the mounting bracket 27 to the workpiece 1 through the mounting hole 27a of the mounting bracket 27 using a bolt or the like (not shown), the pipe body 20 is attached to the workpiece 1 as shown in FIG.

[0019] Next, the first nozzle holes 31 and the second nozzle holes 30 will be described.

[0020] The pair of ejection holes 30, 31 have an inlet opening 41 formed on the inner circumferential surface 23 of the pipe body 20, an outlet opening 43 formed on the outer circumferential surface 22 of the pipe body 20, and a flow passage 45 communicating with the inlet opening 41 and the outlet opening 43. It can also be said that the ejection holes 30, 31 have the inlet opening 41 in the form of a slit extending in the circumferential direction of the inner circumferential surface 23 of the pipe body 20 and communicating with the flow path 21, the outlet opening 43 in the form of a slit extending in the circumferential direction of the outer circumferential surface 22 of the pipe body 20, and the flow passage 45 communicating with the inlet opening 41 and the outlet opening 43.

[0021] As shown in Figures 4 and 5, the inlet opening 41 in this embodiment extends in an arc shape along the circumferential direction R of the inner surface 23 of the pipe body 20, and is a narrow slit-like shape formed with a predetermined width in the axial direction of the pipe body 20, and is connected to the flow path 21.

[0022] On the other hand, the outlet opening 43 extends in an arc shape along the circumferential direction R of the outer peripheral surface 22 of the pipe body 20, and is a narrow slit-like shape formed with a predetermined width in the axial direction of the pipe body 20, and is connected to the external space of the pipe body 20.

[0023] In addition, the outlet opening 43 is formed to have a larger opening width along the circumferential direction of the pipe body 20 than the inlet opening 41. That is, as shown in Fig. 5, the opening width W2 of the outlet opening 43 along the circumferential direction R of the pipe body 20 is larger than the opening width W1 of the inlet opening 41 along the circumferential direction R of the pipe body 20.

[0024] Furthermore, the first nozzle hole 31 and the second nozzle hole 30 are each disposed at a position facing the axis C of the pipe body 20 when viewed from the axial direction of the pipe body 20.

[0025] Also, as shown in Figure 5, when viewed from the axial direction of the pipe body 20 (which can also be said when viewing a cross section perpendicular to the axial direction of the pipe body 20), the widthwise center of the inlet opening 41 and the widthwise center of the outlet opening 43 are positioned so as to be misaligned in the circumferential direction of the pipe body 20.

[0026] Specifically, the widthwise center of the inlet opening 41 of each of the ejection holes 30, 31, i.e., the center W1' of the opening width W1, and the widthwise center of the outlet opening 43 of each of the ejection holes 30, 31, i.e., the center W2' of the opening width W2, are misaligned in the circumferential direction R of the pipe body 20.

[0027] As shown in Figure 5, the inlet opening 41 extends across a common straight line L1 passing through the axis C of the pipe body 20, and the outlet opening 43 is provided so as to be located on both sides of a straight line L2 perpendicular to the straight line L1.

[0028] In this embodiment, a straight line passing through the axis C of the pipe body 20 and passing through a point opposite in the radial direction of the pipe body 20, i.e., a line extending horizontally on the paper surface of Figure 5, is defined as "straight line L1", and a line passing through the axis C of the pipe body 20 and disposed perpendicular to the straight line L2 is defined as "straight line L2".

[0029] 5, the outlet openings 43, 43 of the ejection holes 30, 31 are arranged to face in the same direction apart from the straight line L1. In this embodiment, the outlet openings 43, 43 of the ejection holes 30, 31 are arranged to face in a predetermined radial direction of the pipe body 20 (here, downward on the paper surface of FIG. 5).

[0030] Furthermore, in this embodiment, the pair of ejection holes 30, 31 are disposed on both sides of the straight line L2, and are provided at the same position in the axial direction of the pipe body 20.

[0031] 1 to 3, in this embodiment, a pair of ejection holes 30, 31 are provided at the same axial position at a position slightly closer to the base end than the tip end in the extension direction of the pipe body 20, a pair of ejection holes 30, 31 are provided at the same axial position at the base end in the extension direction of the pipe body 20, and a pair of ejection holes 30, 31 are provided at the same axial position at approximately the center in the extension direction of the pipe body 20. That is, in this embodiment, three pairs of ejection holes 30, 31 are provided, for a total of six ejection holes.

[0032] In this embodiment, the pair of ejection holes 30, 31 are provided at the same axial position of the pipe body 20, but they may be positioned offset by a predetermined length in the axial direction of the pipe body 20, as long as at least one pair of ejection holes is formed.

[0033] Moreover, the ends 41a, 41b of the inlet opening 41 of the first nozzle holes 31 and the second nozzle holes 30 are arranged (layout) as follows.

[0034] That is, as shown in Figure 5, when the pipe body 20 is viewed in a cross section perpendicular to the axial direction, it is divided by two straight lines L1, L2 that pass through the axis C of the pipe body 20 and are perpendicular to each other, defining a first quadrant A1, a second quadrant A2, a third quadrant A3, and a fourth quadrant A4.

[0035] Here, one of the two ends of the inlet opening 41 of the first nozzle hole 31 in the circumferential direction R is designated as one end 41a, and one of the two ends of the inlet opening 41 of the second nozzle hole 30 in the circumferential direction R that is close to the one end 41a of the inlet opening 41 of the first nozzle hole 31 is designated as one end 41a.

[0036] In addition, of the two ends of the inlet opening 41 of the first nozzle hole 31 in the circumferential direction R, the other end is referred to as the other end 41b, and of the two ends of the inlet opening 41 of the second nozzle hole 30 in the circumferential direction R, the other end that is close to the other end 41b of the inlet opening 41 of the first nozzle hole 31 is referred to as the other end 41b.

[0037] One end 41a of the inlet opening 41 of the first nozzle hole 31 is disposed on the first quadrant A1 side, and the other end 41b of the inlet opening 41 of the first nozzle hole 31 is disposed on the fourth quadrant A4 side. Also, one end 41a of the inlet opening 41 of the second nozzle hole 30 is disposed on the second quadrant A1 side, and the other end 41b of the inlet opening 41 of the second nozzle hole 30 is disposed on the third quadrant A4 side.

[0038] As described above, by arranging the inlet openings 41, 41 of the ejection holes 30, 31 in the above-mentioned manner, as shown in Figure 5, the inlet openings 41 of the ejection holes 30, 31 extend so as to straddle the straight line L1, and one end portion 41a, 41a of the inlet openings 41 in the circumferential direction R (end portions adjacent to each other in the circumferential direction R) are positioned at a position that exceeds the straight line L1.

[0039] Of both inner sides of the flow passage 45, the inner side 47 located close to the straight line L2 is formed parallel to the straight line L2. Specifically, as shown in Fig. 5, the inner sides 47, 47 (the inner sides located on the inner side in the width direction, of the inner sides on both sides in the width direction) of the flow passages 45, 45 constituting the ejection holes 30, 31 close to the straight line L2 are linear inner sides that are parallel to each other and also parallel to the straight line L2.

[0040] On the other hand, of both inner sides of the flow passage 45, an inner side 49 at a position spaced apart from the straight line L2 is formed to reach the outlet opening 43 in a shape combining a concave curved surface 50 and a convex curved surface 51.

[0041] Specifically, the inner surfaces 49, 49 of the flow passages 45, 45 that constitute the ejection holes 30, 31, which are spaced apart from the straight line L2 (the inner surface located on the outer side in the width direction among the inner surfaces on both sides in the width direction), are connected to one end 41a in the circumferential direction R of the inlet opening 41, and are formed of a concave curved surface 50 that is concave in a direction away from the axis C of the pipe body 20 and has a curved shape, and a convex curved surface 51 that is connected to one end of the concave curved surface 50, has a convex curved shape that is convex in a direction approaching the axis C of the pipe body 20, and gradually expands toward the outlet opening 43 relative to the inner surface 47.

[0042] That is, the inner side surface 49 of the flow passage 45 is formed so that the opening width gradually increases from the inlet opening 41 side toward the outlet opening 43 side with respect to the straight line L2 as a whole.

[0043] In addition, the inner surface 49 has a starting end of its concave surface 50 that reaches the inlet opening 41, and the end of the concave surface 50 and the starting end of the convex surface 51 are connected to each other (the connected portion can be considered to be an inflection point 52 where the orientations of the concave surface 50 and the convex surface 51 change), and further, the end of the convex surface 51 reaches the outlet opening 43, so that it can be said to have a continuous, smooth, concave-convex curved shape without any steps.

[0044] The above-mentioned inner surface 49 constitutes "at least one of the two inner surfaces of the flow passage" in the present invention.

[0045] Incidentally, the cooling pipe 10 can be manufactured, for example, by using a mold as shown in FIG.

[0046] This mold has first dies 60, 61 which slide toward and away from each other via a parting line PL (here, a straight line along line L1) (on the page of Figure 5, they slide in the vertical direction) and which mainly form the outer peripheral shape of the cooling pipe 10, and a roughly cylindrical second die 62 which slides insertably and removably in the axial direction of the pipe body 20 inside the first dies 60, 61 (on the page of Figure 5, they slide toward the front and back of the page) and which mainly forms the inner peripheral shape of the cooling pipe 10.

[0047] The first die 61 is provided with thin-walled pins 63 and 64 for forming the inner peripheral shape of the pair of nozzle holes 30 and 31.

[0048] 7, during injection molding of the cooling pipe 10, the pair of first dies 60, 61 are closed, the pair of first dies 60, 61 come into contact with each other to form a parting line PL, and the second die 62 is inserted inside the pair of first dies 60, 61 to define a cavity CA. At this time, the inner peripheral ends of the tip ends 63a, 64a in the protruding direction of the pair of ejection hole forming pins 63, 64 come into contact with the circumferentially opposing portions of the second die 62 to hold the second die 62.

[0049] Then, a molten synthetic resin material is injected into the cavity CA defined by the dies 60, 61, 62, and 63, whereby the cooling pipe 10 can be molded.

[0050] (Modification) The shapes, structures, layouts, etc. of the pipe body, mounting bracket, nozzle holes, inlet opening, outlet opening, flow passages, etc. constituting the cooling oil supply pipe for a rotating electrical machine in the present invention are not limited to the above-mentioned embodiments.

[0051] The pipe body 20 in this embodiment has a substantially cylindrical shape, but the pipe body may have, for example, a substantially rectangular cylindrical shape or a substantially elliptical cylindrical shape.

[0052] As described above, the pair of ejection holes may be positioned with a predetermined distance offset in the axial direction of the pipe body, and the outlet openings of the pair of ejection holes may face in opposite directions (this will be described in the fourth embodiment shown in FIG. 10). Furthermore, in this embodiment, three pairs of ejection holes 30, 31 are provided, but the number of pairs of ejection holes may be one or two, or four or more.

[0053] In addition, the inner surface of the ejection hole close to the straight line L2 may be formed so as to approach the straight line L2 from the inlet opening side to the outlet opening side (this will be described in the second embodiment shown in Figure 8).

[0054] Furthermore, the inner surface of the nozzle hole spaced apart from the straight line L2 may be not only a combination of a concave curved surface and a convex curved surface, but also a combination of a concave curved surface, a straight line and a convex curved surface (this will be described in the second embodiment shown in Figure 8), or a combination of multiple straight lines (this will be described in the third embodiment shown in Figure 9).

[0055] (Action and effect) Next, the function and effect of the cooling pipe 10 having the above configuration will be described.

[0056] That is, when cooling oil is supplied into flow passage 21 from a supply hose or the like (not shown) through supply opening 25, the cooling oil flows through flow passage 21. Then, when the cooling oil reaches inlet opening 41 of ejection holes 30, 31, it flows from inlet opening 41 into flow passage 45, flows through said flow passage 45, and then is ejected (flows out) from outlet opening 43 as shown by the arrow in Fig. 6. Then, a predetermined location of rotating electric machine 5, which is an object to be cooled, is cooled.

[0057] 5, in the cooling pipe 10, the outlet openings 43, 43 of the ejection holes 30, 31 are each formed to have a larger opening width W2 along the circumferential direction R of the pipe body 20 than the inlet openings 41, 41. As a result, the ejection angle of the cooling oil ejected from the ejection holes 30, 31 can be increased, making it possible to eject the cooling oil over a wide range, and efficiently cooling a predetermined location of the rotating electric machine 5.

[0058] In addition, in this embodiment, when viewed from the axial direction of the pipe body 20, the widthwise center (center W1') of the inlet opening 41 and the widthwise center (center W2') of the outlet opening 43 are positioned so as to be misaligned in the circumferential direction of the pipe body 20 (see Figure 5).

[0059] According to the above aspect, since the inlet opening 41 and the outlet opening 43 are arranged as described above, a long flow path length (path length) of the ejection holes 30, 31 can be ensured, and the amount of cooling oil ejected from the ejection holes 30, 31 can be easily stabilized.

[0060] Furthermore, in this embodiment, when the pipe body 20 is viewed in a cross section perpendicular to the axial direction, the first quadrant A1, second quadrant A2, third quadrant A3, and fourth quadrant A4 are separated by two straight lines L1 and L2 that pass through the axis C of the pipe body 20 and are perpendicular to each other. Of these, one end 41a of the inlet opening 41 of the first nozzle hole 31 is located on the first quadrant A1 side and the other end 41b is located on the fourth quadrant A4 side, and one end 41a of the inlet opening 41 of the second nozzle hole 30 is located on the second quadrant A2 side and the other end 41b is located on the third quadrant A3 side (see Figure 5).

[0061] According to the above-described embodiment, the inlet openings 41, 41 of the ejection holes 30, 31 are arranged as described above, so that the inlet openings 41 of the ejection holes 30, 31 extend so as to straddle the straight line L1, and one end portion 41a, 41a of the inlet openings 41 in the circumferential direction R (end portions adjacent to each other in the circumferential direction R) are positioned at a position that exceeds the straight line L1.

[0062] In other words, since the inlet openings 41 of the ejection holes 30, 31 extend across a common straight line L1 passing through the axis C of the pipe body 20, they can be formed to extend to the maximum extent across the thickness of the pipe body 20, rather than the minimum distance from the outer peripheral surface 22 to the inner peripheral surface 23 of the pipe body 20, and therefore a long flow path length can be ensured.

[0063] In this embodiment, the inlet openings 41 of the ejection holes 30, 31 are slit-shaped extending in the circumferential direction R of the inner circumferential surface 23 of the pipe body 20. Therefore, the opening width W1 of the inlet openings 41 of the ejection holes 30, 31 can be secured to be wide. As a result, the pressure loss of the cooling oil flowing from the inlet openings 41 into the flow passage 45 can be reduced (because the inlet openings 41 are wide, the cooling oil can easily flow from the inlet openings 41 into the flow passage 45), and the cooling oil can be ejected from the outlet openings 43 with force.

[0064] Furthermore, in this embodiment, as shown in FIG. 5, the outlet openings 43, 43 of the ejection holes 30, 31 are arranged to face the same direction and be spaced apart from each other with respect to the straight line L1.

[0065] According to the above embodiment, since the outlet opening 43 is laid out as described above, the cooling oil can be sprayed in the same direction from a pair of ejection holes 30, 31, and a specific location of the rotating electric machine 5, which is the object to be cooled, can be efficiently cooled.

[0066] In this embodiment, as shown in FIG. 5, one of the inner surfaces of the flow passage 45, inner surface 49, is formed to extend to the outlet opening 43 in a shape combining a concave curved surface 50 and a convex curved surface 51.

[0067] According to the above-mentioned embodiment, since the inner surface 49 of the flow passage 45 has the above-mentioned configuration, the flow of the cooling oil that flows into the flow passage 45 from the inlet opening 41, flows through the flow passage 45 and is ejected from the outlet opening 43 can be made less disturbed (less likely to become turbulent), thereby suppressing pressure loss of the cooling oil and allowing the cooling oil to be ejected forcefully from the outlet opening 43.

[0068] Furthermore, in this embodiment, as shown in FIG. 5, an inner side surface 47 of the flow passage 45 adjacent to the straight line L2 is formed parallel to the straight line L2.

[0069] According to the above embodiment, since the inner surface 47 of the flow passage 45 has the above-mentioned configuration, the cooling oil can be ejected so as to cover the vicinity of the adjacent peripheral portions of the outlet openings 43, 43 of a pair of ejection holes 30, 31, thereby reducing the number of locations where cooling leaks occur.

[0070] In this embodiment, the pair of ejection holes 30, 31 are disposed on both sides of the straight line L2 and are provided at the same position in the axial direction of the pipe body 20, as shown in FIGS.

[0071] According to the above embodiment, the pair of ejection holes 30, 31 are arranged on both sides of the straight line L2 and are provided at the same axial position of the pipe body 20. Therefore, as described above, when the outer peripheral shape of the cooling pipe 10 is formed by a pair of first dies 60, 61 spaced close to each other and the inner peripheral shape of the cooling pipe 10 is formed by the approximately cylindrical second die 62 which is drawn out in the axial direction, the approximately cylindrical second die 62 can be held in a clamped state by the thin-walled pin-like ejection hole forming pins 63, 64 which form the inner peripheral shape of the pair of ejection holes 30, 31.

[0072] As a result, it is possible to improve the molding accuracy of the cooling pipe 10. In other words, since it is possible to prevent the core of the substantially cylindrical second die 62 (the second die 62 from shaking in the axial direction), it becomes easier to mold the pipe body 20 with a uniform wall thickness, and the ejection holes 30, 31 can be molded with high accuracy.

[0073] Furthermore, since the pair of ejection holes 30, 31 are provided at the same axial position of the pipe body 20, the cooling oil can be ejected with high precision toward the intended cooling location of the rotating electrical machine 5, which is the object to be cooled.

[0074] (Second embodiment of the cooling oil supply pipe for a rotating electrical machine) A second embodiment of the cooling oil supply pipe for a rotating electrical machine according to the present invention is shown in Fig. 8. Note that parts substantially the same as those in the above embodiment are given the same reference numerals and their description will be omitted.

[0075] A rotating electrical machine cooling oil supply pipe 10A (hereinafter also simply referred to as "cooling pipe 10A") of this embodiment has ejection holes 30A and 31A having shapes different from the ejection holes 30 and 31 of the above embodiment.

[0076] That is, as shown in FIG. 8, an inner surface 47 of a flow passage 45 constituting the ejection holes 30A, 31A adjacent to the straight line L2 is formed so as to approach the straight line L2 from the inlet opening 41 side toward the outlet opening 43 side.

[0077] More specifically, the inner surfaces 47, 47 of the flow passages 45, 45 that are close to the straight line L2 have a shape that extends toward the straight line L2 while drawing a slightly curved surface from the inlet opening 41 side toward the outlet opening 43 side.

[0078] In addition, the inner surface 49 of the flow passage 45 that constitutes the ejection holes 30A, 31A, which is spaced apart from the straight line L2, is formed to reach the outlet opening 43 in a shape that combines a concave curved surface 53, a linear inner surface 54, and a convex curved surface 55.

[0079] More specifically, the inner surfaces 49, 49 of the flow passages 45, 45, which are spaced apart from the straight line L2, are formed from a concave surface 53 formed from one end 41a in the circumferential direction R of the inlet opening 41, a linear inner surface 54 extending diagonally and linearly from one end of the concave surface 53 so as to gradually move away from the straight line L2, and a convex surface 55 connected to one end of the linear inner surface 54 and gradually expanding toward the outlet opening 43 so as to become wider than the inner surface 47.

[0080] That is, the inner side surface 49 of the flow passage 45 is formed so that the opening width gradually increases from the inlet opening 41 side toward the outlet opening 43 side with respect to the straight line L2 as a whole.

[0081] In this embodiment, the same effects as those of the above embodiment can be obtained. In addition, the inner side surface 47 of the flow passage 45 adjacent to the straight line L2 is formed to approach the straight line L2 from the inlet opening 41 side toward the outlet opening 43 side, so that the cooling oil can be ejected so as to cover the vicinity of the adjacent peripheral portions of the outlet openings 43, 43 of the pair of ejection holes 30, 31, and the number of places where cooling leakage occurs can be reduced.

[0082] (Third embodiment of the cooling oil supply pipe for a rotating electrical machine) A third embodiment of the cooling oil supply pipe for a rotating electrical machine according to the present invention is shown in Fig. 9. Note that parts that are substantially the same as those in the above embodiment are given the same reference numerals and the description thereof will be omitted.

[0083] A rotating electrical machine cooling oil supply pipe 10B (hereinafter also simply referred to as "cooling pipe 10B") of this embodiment has ejection holes 30B and 31B with a different shape from the ejection holes of the previous embodiment.

[0084] That is, as shown in FIG. 9, the inner surface 49 of the flow passage 45 constituting the ejection holes 30B, 31B, which is spaced apart from the straight line L2, is formed from a first linear inner surface 56 extending linearly and parallel to the straight line L1 from one end 41a in the circumferential direction R of the inlet opening 41, and a second linear inner surface 57 extending obliquely and linearly from one end of the first linear inner surface 56 so as to gradually move away from the straight line L2.

[0085] That is, the inner side surface 49 of the flow passage 45 is formed so that the opening width gradually increases with respect to the straight line L2 from the inlet opening 41 side toward the outlet opening 43 side. Note that, in this embodiment as well, the same effects as those in the above embodiment can be obtained.

[0086] (Fourth embodiment of the cooling oil supply pipe for a rotating electrical machine) A fourth embodiment of the cooling oil supply pipe for a rotating electrical machine according to the present invention is shown in Fig. 10. Note that parts that are substantially the same as those in the above-mentioned embodiment are given the same reference numerals and the description thereof will be omitted.

[0087] In the rotating electrical machine cooling oil supply pipe 10C (hereinafter, simply referred to as the “cooling pipe 10C”) of this embodiment, the direction of the ejection holes 31C is opposite to that of the ejection holes 30.

[0088] Specifically, as shown in FIG. 10, the outlet opening 43 of the ejection hole 30 is arranged facing a predetermined radial direction of the pipe body 20 (facing downward on the page in FIG. 10), while the outlet opening 43 of the ejection hole 31C is arranged facing in the opposite direction (reverse direction) to the opening direction of the outlet opening 43 of the ejection hole 30 in the radial direction of the pipe body 20 (facing upward on the page in FIG. 10).

[0089] The inlet opening 41 of the ejection hole 31C extends across the straight line L1 so as to be in the opposite direction to the inlet opening 41 of the ejection hole 30. It can also be said that the inlet opening 41 of the ejection hole 30 and the inlet opening 41 of the ejection hole 31C are arranged such that their one ends 41a, 41a are point-symmetric with respect to the axis C of the pipe body 20.

[0090] In this embodiment, the same effects as those of the above embodiment can be obtained. In addition, since the opening directions of the outlet opening 43 of the ejection hole 30 and the outlet opening 43 of the ejection hole 31C are opposite to each other, for example, in a case where there are two rotating electric machines as objects to be cooled, by disposing the cooling pipe 10C between these rotating electric machines, both of the two rotating electric machines can be cooled simultaneously and efficiently.

[0091] Furthermore, the present invention is not limited to the above-described embodiment, and various modified embodiments are possible within the scope of the gist of the present invention, and such embodiments are also included in the scope of the present invention. [Explanation of symbols]

[0092] 5 Rotating Electric Machines 10, 10A, 10B, 10C Cooling oil supply pipe for rotating electrical machine (cooling pipe) 20 Pipe body 21 Flow Path 30,30A,30B,31,31A,31B,31C Nozzle 41 Entrance opening 43 Exit opening 45 Distribution path 47 Inner surface 49 Inner surface 50 Concave Surface 51 Convex curved surface

Claims

1. A cooling oil supply pipe for a rotating electric machine that sprays cooling oil toward a rotating electric machine, a pipe body extending a predetermined length and forming a flow path through which the cooling oil flows, the pipe body having an ejection hole formed therein and communicating with the flow path and ejecting the cooling oil, the ejection hole has an inlet opening formed on an inner circumferential surface of the pipe body, an outlet opening formed on an outer circumferential surface of the pipe body, and a flow passage communicating with the inlet opening and the outlet opening, 2. A cooling oil supply pipe for a rotating electrical machine, comprising: a first outlet opening having a width along a circumferential direction of the pipe body that is greater than a width of the first inlet opening;

2. 2. A cooling oil supply pipe for a rotating electric machine as described in claim 1, wherein, when viewed in the axial direction of the pipe body, the widthwise center of the inlet opening and the widthwise center of the outlet opening are arranged so as to be misaligned in the circumferential direction of the pipe body.

3. The nozzle includes a first nozzle and a second nozzle, 3. A cooling oil supply pipe for a rotating electric machine as claimed in claim 1 or 2, wherein, when the pipe body is viewed in a cross section perpendicular to the axial direction, the pipe body is divided into a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant by two straight lines passing through the axis of the pipe body and perpendicular to each other, and wherein one end of the inlet opening of the first jet hole is located on the first quadrant side and the other end is located on the fourth quadrant side, and wherein one end of the inlet opening of the second jet hole is located on the second quadrant side and the other end is located on the third quadrant side.

4. 3. The cooling oil supply pipe for a rotating electrical machine according to claim 1, wherein at least one of the inner surfaces of the flow passage is formed to have a shape combining a concave surface and a convex surface so as to reach the outlet opening.

Images