Cooling oil supply pipe for rotary electric machine

Abstract

To provide a cooling oil supply pipe for a rotary electric machine that can eject cooling oil from an ejection port with great force.SOLUTION: A cooling oil supply pipe 10 for a rotary electric machine includes a pipe body 20 and an ejection hole 40. In an inner periphery of the pipe main body 20, a circulation regulation part 31 projecting from an inner peripheral surface of the pipe body to the axis center is formed. The ejection hole 40 includes: an inflow opening 43 which is formed in the inner peripheral surface of the pipe main body 20 and into which cooling oil flows; and an ejection port 45 that is formed in an outer peripheral side of the pipe body 20 and through which cooling oil ejects. An edge part 43a on tip side of the pipe body 20 of the inflow opening 43 in the axis direction and an edge part 41a on a base end side in the projection direction of the circulation regulation part 31 are disposed such that they overlap each other in the axis direction of the pipe body 20.SELECTED DRAWING: Figure 4

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] A plurality of holes (first hole, second hole, third hole, fourth hole) that communicate with the refrigerant flow path are formed at predetermined locations of the above pipe, and the refrigerant flowing through the refrigerant flow path is sprayed from the plurality of holes toward the coil.

[0005] The pipe has a circular inner periphery and an outer periphery, and the inner periphery and the outer periphery are cylindrical with a constant diameter. Furthermore, as shown in Fig. 6 of Patent Document 1, each hole is a through hole with a constant diameter that is 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]

[0006] [Patent Document 1] Patent No. 5865215 Summary of the Invention [Problem to be solved by the invention]

[0007] The pipe in the cooling structure of Patent Document 1 has a cylindrical inner circumference with a constant diameter, and a hole is formed through the peripheral wall of the pipe. Therefore, when the refrigerant is supplied into the pipe and flows through the pipe, it changes its flow direction when it reaches the hole and is sprayed from the hole, but the force of the force depends on the supply pressure of the refrigerant, and there are cases where the refrigerant cannot be sprayed from the hole with sufficient force.

[0008] 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 ejecting cooling oil from an ejection port with great force. [Means for solving the problem]

[0009] In order to achieve the above-mentioned object, the present invention provides a cooling oil supply pipe for a rotating electric machine, which sprays cooling oil toward a rotating electric machine, comprising: a pipe body extending a predetermined length and forming a flow path inside through which the cooling oil flows from the base end side to the tip end side; and an outlet hole formed in the pipe body and communicating with the flow path, wherein a flow regulating portion is formed on the inner circumference of the pipe body and protrudes from the inner surface of the pipe body toward the inner diameter side, and the outlet hole has an inlet opening formed on the inner surface of the pipe body through which the cooling oil flows in, and an outlet formed on the outer periphery of the pipe body through which the cooling oil sprays out, wherein an edge portion of the inlet opening on the tip side in the axial direction of the pipe body and an edge portion of the flow regulating portion on the base end side in the protruding direction are arranged so as to overlap in the axial direction of the pipe body. Effect of the Invention

[0010] In the present invention, the edge of the inlet opening constituting the ejection hole at the axial tip side and the edge of the flow restriction part at the protruding base end side are arranged to overlap in the axial direction of the pipe body, so that the cooling oil supplied into the flow passage of the pipe body and flowing in the axial direction of the pipe body collides with the flow restriction part, so that the flow in the axial direction is restricted and the flow direction is changed to a direction intersecting the axis of the pipe body. As a result, the cooling oil is guided to the inlet opening, so that the cooling oil can be ejected forcefully from the ejection hole. [Brief description of the drawings]

[0011] [Figure 1] 1 is a perspective view showing an 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] 1 is an enlarged sectional perspective view of a main portion of a cooling oil supply pipe for a rotating electrical machine according to the present invention; [Diagram 5] FIG. 5 is an enlarged cross-sectional view of a main part of FIG. [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] 11 is a perspective view showing another embodiment of a cooling oil supply pipe for a rotating electrical machine according to the present invention; FIG. [Figure 8] FIG. 2 is a side view of the cooling oil supply pipe for a rotating electrical machine. [Figure 9] FIG. 2 is a front view of the cooling oil supply pipe for a rotating electrical machine. [Figure 10] 9 is a cross-sectional view taken along the line BB of FIG. 8. [Figure 11] 1 is an enlarged sectional perspective view of a main portion of a cooling oil supply pipe for a rotating electrical machine according to the present invention; [Figure 12] FIG. 12 is an enlarged cross-sectional view of a main part of FIG. [Figure 13] FIG. 11 is an enlarged cross-sectional view of a main portion of a modified example of a cooling oil supply pipe for a rotating electrical machine according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] (One embodiment of a cooling oil supply pipe for a rotating electrical machine) Hereinafter, one embodiment of a cooling oil supply pipe for a rotating electrical machine according to the present invention will be described with reference to Figs.

[0013] 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.

[0014] As shown in Figures 1 to 3, the cooling pipe 10 has a pipe body 20 extending a predetermined length and having a flow path 21 (see Figure 3) formed therein through which cooling oil flows from the base end to the tip end, and a plurality of ejection holes 40 formed in the pipe body 20, connected to the flow path 21, and ejecting the cooling oil.

[0015] A flow restriction portion 31 (hereinafter, simply referred to as "restriction portion 31") is formed on the inner circumference of the pipe body 20, protruding from the inner circumference surface of the pipe body 20 toward the axis C of the pipe body 20. It can also be said that the restriction portion 31 in this embodiment protrudes radially inward from the inner circumference surface of the pipe body 20. The restriction portion 31 restricts the flow of cooling oil flowing through the flow passage 21 in the axial direction.

[0016] The oil ejection hole 40 has an inlet opening 43 formed on the inner circumference of the pipe body 20 through which the cooling oil flows in, and an outlet 45 formed on the outer circumference of the pipe body 20 through which the cooling oil is ejected.

[0017] As shown in Figures 3 and 4, the edge portion 43a of the inlet opening 43 on the tip side in the axial direction of the pipe body 20 and the edge portion 31a of the regulating portion 31 on the base end side in the protruding direction are arranged so as to overlap in the axial direction of the pipe body 20.

[0018] Next, each part will be described in detail. The pipe body 20 in this embodiment has a multi-stage cylindrical structure in which a first cylindrical part 27, a second cylindrical part 28, a third cylindrical part 29, and a fourth cylindrical part 30, each of which is substantially cylindrical, are connected in the axial direction from the base end side to the tip end side in the axial direction via a restricting part 31 (see Figs. 3 to 5) and an outer peripheral step part 33.

[0019] The inner dimensions (inner dimensions) and outer dimensions (outer dimensions) of each cylindrical portion are largest for the first cylindrical portion 27, and gradually decrease in size for the second cylindrical portion 28, the third cylindrical portion 29, and the fourth cylindrical portion 30 (details will be described later).

[0020] In this embodiment, since each of the tubular parts 27, 28, 29, and 30 has a substantially cylindrical shape, the inner dimension is the inner diameter and the outer dimension is the outer diameter of each of the tubular parts 27, 28, 29, and 30. The axial direction of the pipe body 20 means the direction along the axis C of the pipe body 20 (a line segment that passes through the radial center of the pipe body 20 and extends in the longitudinal direction of the pipe body 20), and can also be said to be the extension direction of the pipe body 20.

[0021] A closing portion 23 is arranged at the tip of the fourth tubular portion 30 located at the axially most extreme end of the pipe body 20, and the tip of the pipe body 20 is closed. Furthermore, as shown in Fig. 3, a substantially circular cooling oil supply opening 25 (hereinafter also simply referred to as "supply opening 25") is formed in the first tubular portion 27 located at the axially most proximal end of the pipe body 20, and the proximal end of the pipe body 20 is open.

[0022] A supply hose, 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.

[0023] The pipe body 20 is provided on its inner circumference with an inner circumference expanded portion having a predetermined inner dimension and an inner circumference reduced portion having an inner dimension smaller than that of the inner circumference expanded portion, disposed between the inner circumference stepped portion and extending from the base end side toward the tip end side in the axial direction of the pipe body 20. The inner circumference stepped portion forms the restricting portion 31.

[0024] Furthermore, on the outer periphery of the pipe body 20, there are provided, from the base end side toward the tip end side in the axial direction of the pipe body 20, an outer peripheral expanded portion provided at a position that matches the inner peripheral expanded portion, and an outer peripheral reduced portion provided at a position that matches the inner peripheral reduced portion and formed so that its outer dimension is smaller than that of the outer peripheral expanded portion via the outer peripheral step portion 33.

[0025] Describing each of the tubular portions 27, 28, 29, and 30 of the pipe body 20 in more detail, the first tubular portion 27 arranged at the base end in the axial direction of the pipe body 20 is approximately cylindrical, with a first inner peripheral portion 27a having a circular shape on its inner circumference and a first outer peripheral portion 27b having a circular shape on its outer circumference.

[0026] The inner diameter of the first inner peripheral portion 27a is larger than the inner diameters of the inner peripheral portions 28a, 29a, and 30a of the cylindrical portions 28, 29, and 30. The outer diameter of the first outer peripheral portion 27b is larger than the outer diameters of the outer peripheral portions 28b, 29b, and 30b of the cylindrical portions 28, 29, and 30. Furthermore, the axial length of the first cylindrical portion 27 is the shortest compared to the axial lengths of the cylindrical portions 28, 29, and 30.

[0027] The second tubular portion 28, which is positioned closer to the axial tip of the pipe body 20 than the first tubular portion 27, is approximately cylindrical, with a second inner peripheral portion 28a having a circular shape on its inner circumference and a second outer peripheral portion 28b having a circular shape on its outer circumference.

[0028] The inner diameter of the second inner circumferential portion 28a is smaller than the inner diameter of the first inner circumferential portion 27a of the first cylindrical portion 27, and larger than the inner diameters of the inner circumferential portions 29a, 30a of the cylindrical portions 29, 30. The outer diameter of the second outer circumferential portion 28b is smaller than the outer diameter of the first outer circumferential portion 27b of the first cylindrical portion 27, and larger than the outer diameters of the outer circumferential portions 29b, 30b of the cylindrical portions 29, 30. Furthermore, the axial length of the second cylindrical portion 28 is the longest among the axial lengths of the cylindrical portions 27, 29, 30.

[0029] The third tubular portion 29, which is positioned closer to the axial tip of the pipe body 20 than the second tubular portion 28, is approximately cylindrical in shape, with a third inner peripheral portion 29a having a circular shape on its inner circumference and a third outer peripheral portion 29b having a circular shape on its outer circumference.

[0030] The inner diameter of the third inner peripheral portion 29a is smaller than the inner diameters of the inner peripheral portions 27a, 28a of the cylindrical portions 27, 28, and larger than the inner diameter of the fourth inner peripheral portion 30a of the fourth cylindrical portion 30. The outer diameter of the third outer peripheral portion 29b is smaller than the outer diameters of the outer peripheral portions 27b, 28b of the cylindrical portions 27, 28, and larger than the outer diameter of the fourth outer peripheral portion 30b of the fourth cylindrical portion 30. Furthermore, the axial length of the third cylindrical portion 29 is shorter than the axial length of the second cylindrical portion 28, and longer than the axial length of the cylindrical portions 27, 30.

[0031] The fourth tubular portion 30, which is located at the axial end of the pipe body 20, is approximately cylindrical in shape, with a fourth inner peripheral portion 30a having a circular shape on its inner circumference and a fourth outer peripheral portion 30b having a circular shape on its outer circumference.

[0032] The inner diameter of the fourth inner peripheral portion 30a is smaller than the inner diameters of the inner peripheral portions 27a, 28a, and 29a of the cylindrical portions 27, 28, and 29. The outer diameter of the fourth outer peripheral portion 30b is smaller than the outer diameters of the outer peripheral portions 27b, 28b, and 29b of the cylindrical portions 27, 28, and 29. Furthermore, the axial length of the fourth cylindrical portion 30 is shorter than the axial length of the first cylindrical portion 27 and shorter than the axial length of the cylindrical portions 28 and 29.

[0033] Furthermore, the inner peripheral portions 27a, 28a, 29a, 30a of each of the cylindrical portions 27, 28, 29, 30 are formed with a constant inner diameter from the base end to the tip in the axial direction, and the outer peripheral portions 27b, 28b, 29b, 30b of each of the cylindrical portions 27, 28, 29, 30 are formed with a constant outer diameter from the base end to the tip in the axial direction.

[0034] In addition, the "inner circumference expanded portion" and the "inner circumference reduced portion" provided on the inner circumference of the above-mentioned pipe body 20, and the "outer circumference expanded portion" and the "outer circumference reduced portion" provided on the outer circumference of the pipe body 20 are configured between adjacent cylindrical portions in the axial direction of the pipe body 20.

[0035] In addition, the inner peripheral portion and the outer peripheral portion of a specific cylindrical portion (here, the second cylindrical portion 28 and the third cylindrical portion 29) may form an inner peripheral expanded portion and an outer peripheral expanded portion, and may also form an inner peripheral reduced portion and an outer peripheral reduced portion (they may serve both purposes). However, the inner peripheral portion and the outer peripheral portion of the first cylindrical portion 27 always form only an inner peripheral expanded portion and an outer peripheral expanded portion, and the inner peripheral portion and the outer peripheral portion of the fourth cylindrical portion 30 always form only an inner peripheral reduced portion and an outer peripheral reduced portion.

[0036] To explain this, first, the relationship between the inner peripheral expanded portion, inner peripheral reduced portion, outer peripheral expanded portion, and outer peripheral reduced portion in the first cylindrical portion 27 and the second cylindrical portion 28 is as follows: That is, in the first cylindrical portion 27 and the second cylindrical portion 28, the first inner peripheral portion 27a of the first cylindrical portion 27 forms the inner peripheral expanded portion, the second inner peripheral portion 28a of the second cylindrical portion 28 forms the inner peripheral reduced portion, the first outer peripheral portion 27b of the first cylindrical portion 27 forms the outer peripheral expanded portion, and the second outer peripheral portion 28b of the second cylindrical portion 28 forms the inner peripheral reduced portion.

[0037] The relationships between the inner peripheral expanded portion, inner peripheral reduced portion, outer peripheral expanded portion, and outer peripheral reduced portion in the second cylindrical portion 28 and the third cylindrical portion 29 are as follows: That is, in the second cylindrical portion 28 and the third cylindrical portion 29, the second inner peripheral portion 28a of the second cylindrical portion 28 forms the inner peripheral expanded portion, the third inner peripheral portion 29a of the third cylindrical portion 29 forms the inner peripheral reduced portion, the second outer peripheral portion 28b of the second cylindrical portion 28 forms the outer peripheral expanded portion, and the third outer peripheral portion 29b of the third cylindrical portion 29 forms the inner peripheral reduced portion.

[0038] Furthermore, the relationships between the inner peripheral expanded portion, inner peripheral reduced portion, outer peripheral expanded portion, and outer peripheral reduced portion in the third cylindrical portion 29 and the fourth cylindrical portion 30 are as follows: That is, in the third cylindrical portion 29 and the fourth cylindrical portion 30, the third inner peripheral portion 29a of the third cylindrical portion 29 forms the inner peripheral expanded portion, the fourth inner peripheral portion 30a of the fourth cylindrical portion 30 forms the inner peripheral reduced portion, the third outer peripheral portion 29b of the third cylindrical portion 29 forms the outer peripheral expanded portion, and the fourth outer peripheral portion 29b of the fourth cylindrical portion 30 forms the inner peripheral reduced portion.

[0039] In addition, the inner circumference of the pipe body 20 is formed continuously from the base end side to the tip end side in the axial direction, except for the inlet opening 43 of the ejection hole 40, with a first inner circumference portion 27a, an inner circumference step portion forming a regulating portion 31, a second inner circumference portion 28a, an inner circumference step portion (regulating portion 31), a third inner circumference portion 29a, an inner circumference step portion (regulating portion 31), and a fourth inner circumference portion 30a.

[0040] Furthermore, the inner circumference of the pipe body 20 is continuously formed, from the base end to the tip end in the axial direction, with a first outer peripheral portion 27b, an outer peripheral step portion 33, a second outer peripheral portion 28b, an outer peripheral step portion 33, a third outer peripheral portion 29b, an outer peripheral step portion 33, and a fourth outer peripheral portion 30b, except for the outlet 45 of the ejection hole 40.

[0041] In addition, in this embodiment, the inner peripheral step portion and the outer peripheral step portion 33 constituting the regulating portion 31 have a flat shape formed perpendicular to the axis C of the pipe body 20 from the inner circumference of the pipe body 20 toward the axis C of the pipe body 20, and are annular step portions that fit the circular inner peripheral portion and the circular outer peripheral portion.

[0042] Furthermore, the inner peripheral step portion forming the restricting portion 31 is formed on the axial base end face of the second cylindrical portion 28, the axial base end face of the third cylindrical portion 29, and the axial base end face of the fourth cylindrical portion 30. It can also be said that the axial base end face of the second cylindrical portion 28, the axial base end face of the third cylindrical portion 29, and the axial base end face of the fourth cylindrical portion 30 form the inner peripheral step portion.

[0043] On the other hand, the outer peripheral step 33 is formed on the axial tip surface of the first cylindrical portion 27, the axial tip surface of the second cylindrical portion 28, and the axial tip surface of the third cylindrical portion 29. It can also be said that the axial tip surface of the first cylindrical portion 27, the axial tip surface of the second cylindrical portion 28, and the axial tip surface of the third cylindrical portion 29 form the outer peripheral step 33.

[0044] The regulating portion 31 protruding from the inner surface of the pipe body 20 toward the inner diameter side, as described above, regulates the axial flow of cooling oil within the flow path 21 and, in relation to the inlet opening 43, serves as a part that guides the cooling oil to flow into the inlet opening 43.

[0045] To explain this, as described above, the edge portion 43a of the inlet opening 43 on the tip side in the axial direction of the pipe body 20 and the edge portion 31a of the regulating portion 31 on the base end side in the protruding direction are arranged so as to overlap in the axial direction of the pipe body 20 (see Figures 3 and 4).

[0046] That is, it can also be said that the inflow opening 43 of the ejection hole 40 is provided on the side of the inner circumferential expansion portion of the pipe body 20, and is configured to overlap the restricting portion 31 in the axial direction of the pipe body 20 and open so as to be continuous with the restricting portion 31. Furthermore, it can also be said that the restricting portion 31 is formed so as to overlap (wrap) with the inflow opening 43 in the axial direction and to be continuous with the inflow opening 43.

[0047] As a result of the inflow opening 43 and the regulating portion 431 being configured as described above, the regulating portion 31 collides the cooling oil flowing in the axial direction of the pipe body 20, thereby regulating the flow in the axial direction, and also changes the flow direction of the cooling oil to a direction intersecting the axis C of the pipe body 20 (which can also be said to be a direction intersecting the axial direction of the pipe body 20), thereby serving as an inflow guide portion that guides the cooling oil to flow into the inflow opening 43.

[0048] That is, as shown by arrow F1 in Figure 5, when the cooling oil flowing in the axial direction of the pipe body 20 within the flow path 21 of the pipe body 20 collides with the regulating portion 31 and its flow in the axial direction is restricted, as shown by arrow F2, the flow direction (flow direction) of the cooling oil is changed to a direction that intersects (here perpendicular to) the axis C of the pipe body 20 so as to face the inlet opening 43 side, thereby guiding the cooling oil to flow into the inlet opening 43.

[0049] Next, the shape, structure, arrangement (layout), etc. of the ejection holes 40 will be described.

[0050] As shown in Figures 1 to 3, in this embodiment, the nozzle holes 40 are formed in the regulating portions 31 provided between the tubular portions 27, 28, 29, and 30 arranged adjacent to each other in the axial direction of the pipe body 20 so as to overlap (wrap) in the axial direction of the pipe body 20.

[0051] That is, a first ejection hole 40 is formed so as to overlap with the regulating portion 31 provided between the first cylindrical portion 27 and the second cylindrical portion 28, a second ejection hole 40 is formed so as to overlap with the regulating portion 31 provided between the second cylindrical portion 28 and the third cylindrical portion 29, and a third ejection hole 40 is formed so as to overlap with the regulating portion 31 provided between the third cylindrical portion 29 and the fourth cylindrical portion 30.

[0052] As shown in FIGS. 1 and 2, the multiple ejection holes 40 are arranged at the same position in the circumferential direction of the pipe body 20.

[0053] Furthermore, as described above, each nozzle hole 40 has an inflow opening 43 and an outlet 45, and the inflow opening 43 is provided on the side of the expanded inner circumferential portion of the pipe body 20, overlaps with the regulating portion 31 in the axial direction of the pipe body 20, and opens so as to be continuous with the regulating portion 31, so that in relation to the regulating portion 31, it forms an inflow guide that guides the cooling oil to flow into the inflow opening 43.

[0054] Each nozzle hole 40 has a groove 41 formed so as to extend from the axial tip of the enlarged outer periphery portion toward the axial base end of the pipe body 20. It can also be said that the groove 41 extends from the axial tip of the enlarged outer periphery portion, beyond the restricting portion 31, toward the axial base end of the pipe body 20.

[0055] Furthermore, the groove portion 41 opens toward the inside (here, the inner diameter side) of the pipe body 20 on the base end side in the axial direction, forming an inflow opening 43.

[0056] In addition, the groove portion 41 opens at least on the outside of the pipe body 20 at the axial tip side to form an outlet 45 (here meaning the axial outlet 46 described later), and opens on the inside of the pipe body 20 at the base end side of the groove portion 41 (the side facing the flow path 21 of the pipe body 20) to form an inflow opening 43, so to speak, and the inflow opening 43 and the outlet 45 are formed via the groove portion 41.

[0057] Furthermore, the nozzle 45 provided at the axial tip side of the groove portion 41 also opens to the outer periphery side of the pipe body 20 .

[0058] More specifically, the groove portion 41 constituting the ejection hole 40 has the following configurations (1) to (3).

[0059] That is, (1) the first groove portion 41 is formed from the axial tip of the outer peripheral portion 27b of the first cylindrical portion 27 (the end face on which the outer peripheral step portion 33 is provided) toward the axial base end side, beyond the regulating portion 31 provided between the first cylindrical portion 27 and the second cylindrical portion 28.

[0060] (2) The second groove portion 41 is formed from the axial tip of the outer circumferential portion 28b of the second tubular portion 28 (the end face on which the outer circumferential step portion 33 is provided) beyond the regulating portion 31 provided between the second tubular portion 28 and the third tubular portion 29 toward the axial base end side.

[0061] (3) The third groove portion 41 is formed from the axial tip of the outer circumferential portion 29b of the third tubular portion 29 (the end face on which the outer circumferential step portion 33 is provided) beyond the regulating portion 31 provided between the second tubular portion 28 and the third tubular portion 29 toward the axial base end side.

[0062] Each groove portion 41 is a generally U-shaped notched groove, with the axial base end side being curved in a generally arc shape and with a pair of inner surfaces on both sides in the width direction being parallel to each other.

[0063] Furthermore, at the axial tip side of each groove portion 41, there is formed an axial flow outlet 46 which opens at the axial tip side of the pipe body 20, and an outer circumferential flow outlet 47 (which can also be called a radial flow outlet) which opens at the outer circumferential side (the outer diameter side in this embodiment) of the pipe body 20.

[0064] More specifically, the axial tip side of each groove portion 41 is open to form an axial flow outlet 46, and each groove portion 41 is also open on the outer circumferential portions 27b, 28b, 29b side of each cylindrical portion 27, 28, 29 to form an outer circumferential flow outlet 47, and the axial flow outlet 46 and the outer circumferential flow outlet 47 constitute the ejection port 45.

[0065] As shown in FIG. 4, the outer peripheral outlet port 47 is disposed so as to be shifted toward the tip side in the axial direction of the pipe body 20 with respect to the inlet opening 43 .

[0066] Furthermore, in this embodiment, the edge 43a at the axial tip of the inflow opening 43 is positioned to overlap and align with the flat portion, including the edge 31a on the base end side in the protruding direction, of the restricting portion 31 forming the inner peripheral step, in the axial direction of the pipe body 20 (see Figs. 3 and 4). That is, the edge 43a at the axial tip of the inflow opening 43 is configured to be continuous with the restricting portion 31 forming the axial flow restriction of the cooling oil and the inflow guide to the inflow opening 43 without any step.

[0067] As shown in FIG. 5, the inlet opening 43 overlaps with the axial base end side of the peripheral outlet 47 constituting the jet outlet 45, while being shifted toward the base end side in the axial direction relative to the axial tip sides of the axial outlet 46 and peripheral outlet 47 constituting the jet outlet 45.

[0068] Also, as shown in FIG. 6, the pipe body 20 is configured to be attached to the workpiece 1 via a mounting bracket or the like (not shown) with the outlet 45 of the nozzle 40 facing the rotating electric machine 5 side (here, with the outlet 45 of the nozzle 40 facing downward on the page).

[0069] (Modification) The shapes, structures, layouts, etc. of the pipe body, the outlet holes, the grooves, the inlet openings, the outlet ports, the flow passages, the flow regulating portions, etc. constituting the cooling oil supply pipe for a rotating electric machine in the present invention are not limited to the above-mentioned aspects.

[0070] The pipe body 20 in this embodiment has a shape in which multiple tube sections 27, 28, 29, and 30 each having an approximately cylindrical shape are connected together in the axial direction, but each tube section may also be, for example, approximately rectangular or elliptical.

[0071] In this embodiment, each tubular portion has a generally cylindrical shape with a constant inner diameter and a constant outer diameter, but the inner and outer diameters of each tubular portion may be gradually decreased or increased from the axial base end to the tip end. Even when each tubular portion is a rectangular tube, the inner and outer dimensions may be gradually decreased or increased from the axial base end to the tip end.

[0072] In addition, the restricting portion 31 in this embodiment has a flat shape perpendicular to the axis C of the pipe body 20, but the flow restricting portion may have a tapered surface shape that is inclined from the inner peripheral surface of the pipe body toward the base end side in the axial direction of the pipe body, more specifically, inclined obliquely inward with respect to the axis of the pipe body from the inner peripheral surface of the pipe body toward the base end side in the axial direction of the pipe body. Furthermore, the flow restricting portion may have a concave curved surface that protrudes from the inner peripheral surface of the pipe body toward the base end side in the axial direction of the pipe body more than the tip side in the axial direction.

[0073] In other words, the flow control portion should have a shape and structure that can collide with the cooling oil flowing in the axial direction of the pipe body, thereby controlling the axial flow of the cooling oil, and also change the flow direction of the cooling oil to a direction intersecting the axis of the pipe body, thereby guiding the cooling oil to flow into the inlet opening.

[0074] Furthermore, in this embodiment, only one ejection hole 40 is provided in the circumferential direction between axially adjacent cylindrical portions, but a plurality of ejection holes may be provided in the circumferential direction between axially adjacent cylindrical portions.

[0075] In addition, the ejection holes 40 between a certain axially adjacent tubular portions and the ejection holes 40 between other axially adjacent tubular portions are aligned in the circumferential direction of the pipe body 20, but the ejection holes between a certain axially adjacent tubular portions and the ejection holes between other axially adjacent tubular portions may be misaligned in the circumferential direction of the pipe body.

[0076] Furthermore, the ejection hole 40 in this embodiment has a groove portion 41 which is a notched groove having an approximately U-shape, and the opening of this groove portion 41 on the inside of the axial base end of the pipe body 20 forms an inflow opening 43, and the opening of the groove portion 41 on the outside of the pipe body 20 forms an ejection outlet 45, and the inflow opening 43 and the ejection outlet 45 are formed via the groove portion 41, but the groove portion may be, for example, approximately V-shaped or approximately C-shaped.

[0077] Furthermore, the ejection holes do not necessarily have grooves, and may be, for example, rectangular, round or elliptical through holes that pass through the thickness of the cylindrical portion.

[0078] (Action and effect) Next, the function and effect of the cooling pipe 10 having the above configuration will be described.

[0079] That is, when cooling oil is supplied into the flow passage 21 through the supply opening 25 from a supply hose or the like (not shown), the cooling oil flows through the flow passage 21 substantially along the axial direction of the pipe body 20, as shown by the arrow F1 in FIG.

[0080] When the cooling oil collides with the regulating portion 31 provided between axially adjacent cylindrical portions and the axial flow of the cooling oil is restricted, the flow direction of the cooling oil is changed to a direction perpendicular to the axis C of the pipe body 20 so as to face the inlet opening 43, as shown by arrow F2 in Figure 5, thereby guiding the cooling oil to flow into the inlet opening 43.

[0081] Then, a part of the cooling oil is ejected (flowed out) from axial outlet 46 constituting ejection port 45, and the remaining part of the cooling oil is ejected from peripheral outlet 47 constituting ejection port 45 (see arrows in FIG. 6 ). As a result, a predetermined location of rotating electric machine 5, which is an object to be cooled, is cooled.

[0082] In this cooling pipe 10, the edge portion 43a at the axial tip side of the inlet opening 43 constituting the outlet hole 40 and the edge portion 31a at the protruding base end side of the regulating portion 31 are arranged so as to overlap in the axial direction of the pipe body 20 (see Figures 3 and 4).

[0083] Therefore, as described above, when the cooling oil supplied into the flow passage 21 of the pipe body 20 and flowing in the axial direction of the pipe body 20 collides with the restricting portion 31 and the flow in the axial direction is restricted, the flow direction of the cooling oil is changed to a direction intersecting the axis C of the pipe body 20 (which can also be said to be a direction intersecting the initial flow direction when supplied into the flow passage 21). As a result, the cooling oil is guided to the inlet opening 43, so that the cooling oil can be forcefully ejected from the ejection port 45.

[0084] In addition, in this embodiment, the inner circumference of the pipe body 20 is provided with an inner circumference expanded portion formed with a predetermined inner dimension and an inner circumference reduced portion formed so that the inner dimension is smaller than that of the inner circumference expanded portion via an inner circumference step portion, and the inner circumference step portion forms the regulating portion 31.

[0085] According to the above embodiment, since the inner circumference of the pipe body 20 has the above-mentioned configuration, it is easy to form the restriction portion 31. That is, the inner circumferential step portion, which is inevitably formed when providing the inner circumferential expanded portion and the inner circumferential contracted portion, constitutes the flow restriction portion, so that the flow restriction portion can be easily formed.

[0086] Furthermore, in this embodiment, the restricting portion 31 is provided from the inner periphery of the pipe body 20 toward the axis C of the pipe body 20 so as to be perpendicular to the axis C of the pipe body 20.

[0087] According to the above embodiment, since the restricting portion 31 has the above configuration, the cooling oil supplied into the flow passage 21 of the pipe body 20 is easily caused to collide with the restricting portion 31 and is easily guided more smoothly to the inlet opening 43, so that the cooling oil can be ejected with more force from the ejection port 45. Note that the same effect can be obtained even when the restricting portion 31 is provided so as to incline from the inner circumference of the pipe body 20 toward the base end side in the axial direction of the pipe body 20.

[0088] In addition, in this embodiment, each ejection hole 40 has a groove portion 41 formed to extend from the axial tip of the outer peripheral enlarged portion toward the axial base end side of the pipe body 20, and the groove portion 41 opens on the inside of the pipe body 20 at the axial base end side to form an inlet opening 43, and the axial tip side of each groove portion 41 is formed with an axial outlet port 46 that opens at the axial tip side of the pipe body 20 and a peripheral outlet port 47 that opens on the outer circumferential side of the pipe body 20.

[0089] According to the above aspect, since the axial outlet 46 is formed on the axial tip side of the groove 41, the cooling oil can be ejected toward the axial tip side of the pipe body 20.

[0090] Furthermore, since the groove portion 41 is formed to extend from the axial tip side of the expanded outer circumferential portion of the pipe body 20 toward the axial base end side of the pipe body 20, the ejection holes 40 including the groove portion 41 can be arranged in a layout that makes use of the regulating portion 31 with no waste, making it easier to shorten the overall length of the pipe body 20.

[0091] Furthermore, the groove portion 41 is formed with not only an axial flow outlet 46 but also an outer peripheral flow outlet 47 that opens on the outer circumferential side of the pipe body 20, so that the cooling oil can be sprayed from the nozzle 45 over a wider range.

[0092] In this embodiment, the outer circumferential outlet 47 is disposed so as to be shifted toward the tip side in the axial direction of the pipe body 20 with respect to the inlet opening 43 (see FIG. 4).

[0093] According to the above embodiment, since the outer peripheral outlet 47 has the above-mentioned layout, the cooling oil can be ejected more forcefully toward the axial tip side of the pipe body 20 .

[0094] Furthermore, in this embodiment, the ejection port 45 provided on the axial tip side of the groove portion 41 also opens to the outer periphery side of the pipe body 20 (here, this means the outer periphery outlet port 47).

[0095] According to the above-mentioned embodiment, the outlet 45 provided at the axial tip side of the groove portion 41 has an outer peripheral outflow outlet 47 that also opens to the outer periphery side of the pipe body 20, so that the cooling oil can be ejected not only to the axial tip side of the pipe body 20 but also to the outer periphery side, allowing the cooling oil to be ejected over a wider area.

[0096] (Another embodiment of the cooling oil supply pipe for a rotating electrical machine) 7 to 13 show a second embodiment of the cooling oil supply pipe for a rotating electrical machine according to the present invention. Note that parts that are substantially the same as those in the above embodiment are given the same reference numerals and their description will be omitted.

[0097] A cooling oil supply pipe 10A for a rotating electrical machine (hereinafter also simply referred to as a "cooling pipe 10A") of this embodiment differs from the nozzle holes 40 of the above embodiment mainly in the shape of the nozzle holes 40A.

[0098] 7 and 8, a mounting bracket 26 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 26a is formed at the tip of the mounting bracket 26. The pipe body 20 is attached to the mounting member 1 by fastening the mounting bracket 26 to the mounting hole 26a via a bolt or the like (not shown).

[0099] Furthermore, as shown in Figure 7, in this embodiment, a plurality of ejection holes 40 are formed in each of the regulating portions 31 provided between the tubular portions 27, 28, 29, and 30 arranged adjacent to each other in the axial direction of the pipe body 20, so as to overlap in the axial direction of the pipe body 20.

[0100] That is, three ejection holes 40A are formed radially with respect to the axis C of the pipe body 20 so as to overlap with the restricting portion 31 provided between the first cylindrical portion 27 and the second cylindrical portion 28. Also, three ejection holes 40A are formed radially with respect to the axis C of the pipe body 20 so as to overlap with the restricting portion 31 provided between the second cylindrical portion 28 and the third cylindrical portion 29. Furthermore, three ejection holes 40A are formed radially with respect to the axis C of the pipe body 20 so as to overlap with the restricting portion 31 provided between the third cylindrical portion 29 and the fourth cylindrical portion 30.

[0101] As shown in FIG. 1, the three nozzle holes 40A provided between the cylindrical portions 27 and 28, the three nozzle holes 40A provided between the cylindrical portions 28 and 29, and the three nozzle holes 40A provided between the cylindrical portions 29 and 30 are They are arranged so as to be aligned with each other in the circumferential direction of the pipe body 20 (see FIG. 9).

[0102] In addition, in this embodiment, each ejection hole 40A has a groove portion 41A formed to extend from the axial tip of the outer peripheral enlarged portion (outer peripheral portion 27b, 28b, 29b) of each cylindrical portion 27, 28, 29, beyond the regulating portion 31, toward the base end side in the axial direction.

[0103] 10 to 12, the groove 41A is formed on the inside in the thickness direction of the axial tip of the outer circumferential enlarged portion (the outer circumferential portions 27b, 28b, 29b of each of the tubular portions 27, 28, 29) of the pipe body 20. The groove 41A here has a groove shape formed so as to carve out a radially inner portion of the outer circumferential surface of the outer circumferential portions 27b, 28b, 29b of each of the tubular portions 27, 28, 29.

[0104] The groove portion 41A has an opening on the side facing the flow passage 21 of the pipe body 20, forming an inflow opening 43.

[0105] 11 and 12, the inner surface of the groove portion 41A opposite to the side facing the flow passage 21 of the pipe body 20 forms a tapered surface 48 that gradually widens from the base end side to the tip end side in the axial direction of the groove portion 41A. The tip end of this tapered surface 48 is formed so as to reach the outer circumferential surfaces of the outer circumferential parts 27b, 28b, 29b of each of the cylindrical parts 27, 28, 29, and the axial tip side of the tapered surface 48 forms an outlet 45 consisting of an axial outlet 46 and an outer circumferential outlet 47.

[0106] 12, when the cooling oil flowing in the axial direction of the pipe body 20 inside the flow passage 21 of the pipe body 20 collides with the restricting portion 31 and the flow in the axial direction is restricted, the flow direction of the cooling oil is changed to a direction intersecting (orthogonal to) the axis C of the pipe body 20 so as to face the inlet opening 43 side as shown by the arrow F2, and the cooling oil is guided from flowing into the inlet opening 43. Furthermore, the cooling oil that has passed through the inlet opening 43 is guided in its flow direction by the tapered surface 48 of the groove portion 41A as shown by the arrow F3, and is ejected from the ejection port 45.

[0107] As described above, in this embodiment, the groove portion 41A is formed on the inside in the thickness direction of the axial tip portion of the expanded outer circumferential portion of the pipe body 20, and the inner surface of the groove portion 41A opposite the side facing the flow path 21 of the pipe body 20 forms a tapered surface 48 that gradually expands from the base end side to the tip side in the axial direction of the groove portion 41A.

[0108] According to the above embodiment, the nozzle hole 40A has the groove portion 41A as described above, so that the cooling oil can be ejected from the nozzle 45 while being guided by the tapered surface 48 configured as described above to widen the ejection angle, and therefore the cooling oil can be ejected over a wide range toward the axial tip side of the pipe body 20.

[0109] A modified example of the second embodiment is shown in Fig. 13. In this modified example, a flow restricting portion 35 (hereinafter also simply referred to as "restricting portion 35") is different from the restricting portion 31 of the aspect shown in Figs.

[0110] That is, the regulating portion 35 in this modified example has an inner peripheral portion 36 which has a flat shape perpendicular to the axis C of the pipe body 20 and is located in close proximity to the axis C of the pipe body 20, a tapered portion 37 which slopes diagonally outward from the radial outer edge of the inner peripheral portion 36 toward the axial tip side of the pipe body 20 so as to gradually thin the regulating portion 35, and an outer peripheral portion 38 which has a flat shape perpendicular to the axis C of the pipe body 20 and is provided from the radial outer edge of the tapered portion 37 toward the radial outside of the pipe body 20.

[0111] In addition, it can also be said that the tapered portion 37 has a tapered surface shape that slopes obliquely inward with respect to the axis C of the pipe body 20 from the inner circumference of the pipe body 20 toward the base end side in the axial direction of the pipe body 20.

[0112] In this modified example, since the restricting portion 35 has the above-mentioned configuration, when the cooling oil flowing in the axial direction of the pipe body 20 inside the flow passage 21 of the pipe body 20 collides with the restricting portion 35 and the flow in the axial direction is restricted, the flow direction of the cooling oil can be reliably changed by the tapered portion 37 via the inner peripheral portion 36 to the inflow opening 43 side, and can be guided to the inflow opening 43 via the outer peripheral portion 38. As a result, the function of the restricting portion 35 to guide the cooling oil to the inflow opening 43 can be improved.

[0113] 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]

[0114] 5 Rotating Electric Machines 10,10A Cooling oil supply pipe for rotating electrical machines (cooling pipe) 20 Pipe body 21 Flow Path 27 First cylinder part 28 Second tube part 29 Third cylinder part 30 4th cylinder part 31, 35 Flow control section (inner peripheral step section) 33 Outer peripheral step section 40, 40A Jet holes 41, 41A Groove sections 43 Inflow opening 45 Jet outlet 46 Axial direction outlet 47 Outer peripheral outlet 48 Tapered surface

Claims

1. A cooling oil supply pipe for a rotating electric machine that sprays cooling oil toward a rotating electric machine, The cooling oil is supplied to the pipe body through a passage formed therein, the passage extending a predetermined length from a base end side to a tip end side of the pipe body, and a nozzle hole formed in the pipe body and communicating with the passage. A flow control portion is formed on the inner periphery of the pipe body, the flow control portion protruding from the inner periphery of the pipe body toward the axis of the pipe body, The oil outlet has an inlet opening formed on an inner circumferential surface of the pipe body through which the cooling oil flows, and an outlet opening formed on an outer circumferential side of the pipe body through which the cooling oil is ejected, A cooling oil supply pipe for a rotating electric machine, characterized in that an edge portion of the inlet opening at the tip end in the axial direction of the pipe body and an edge portion of the flow regulating portion at the base end in the protruding direction are arranged so as to overlap in the axial direction of the pipe body.

2. 2. A cooling oil supply pipe for a rotating electric machine as described in claim 1, wherein an inner circumference of the pipe body is provided with an inner circumference expanded portion formed with a predetermined inner dimension and an inner circumference reduced portion formed through an inner circumference step portion so that the inner dimension is smaller than that of the inner circumference expanded portion, and the inner circumference step portion forms the flow restriction portion.

3. 3. The cooling oil supply pipe for a rotating electric machine as described in claim 2, wherein the flow regulating portion is arranged from the inner surface of the pipe body toward the axis of the pipe body, perpendicular to the axis of the pipe body, or inclined from the inner surface of the pipe body toward the base end side in the axial direction of the pipe body.

4. The pipe body has an outer periphery provided from a base end side toward a tip end side in an axial direction thereof, the outer periphery of the pipe body having an outer periphery expanded portion provided at a position that matches the inner periphery expanded portion, and an outer periphery reduced portion provided at a position that matches the inner periphery reduced portion and formed so as to have an outer dimension smaller than that of the outer periphery expanded portion via an outer periphery stepped portion, the ejection hole has a groove portion formed so as to extend from an axial tip of the outer circumferentially expanded portion toward a base end side in the axial direction of the pipe body, The groove portion has an opening on the inside of the pipe body at a base end side in the axial direction, and forms the inflow opening, 4. A cooling oil supply pipe for a rotating electric machine as claimed in claim 2 or 3, wherein an axial outlet opening is formed at the axial tip side of the groove portion, the axial outlet opening being formed at the axial tip side of the pipe body, and an outer circumferential outlet opening being formed at the outer circumferential side of the pipe body.

5. 5. The cooling oil supply pipe for a rotating electrical machine according to claim 4, wherein the outer peripheral outlet port is disposed offset from the inlet opening toward a tip end side in the axial direction of the pipe body.

6. 5. A cooling oil supply pipe for a rotating electric machine as described in claim 4, wherein the groove portion is formed on the inside in the thickness direction of the axial tip portion of the outer peripheral enlarged portion, and the inner surface of the groove portion opposite the side facing the flow path of the pipe body forms a tapered surface that gradually expands from the base end side of the groove portion toward the tip side in the axial direction.

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