JP2008077885A - Shielded conductive passage and manufacturing method of shielded conductive passage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a constitution that heat dissipation characteristics can be improved effectively in a shielded conductive passage surrounding an electrical wire by a corrugate tube 10. <P>SOLUTION: The shielded conductive passage 1 connects, for example, between equipment such as an inverter device and a motor in an electric automobile, and equipped with a plurality of electric wires 30, a braided wire 20 collectively surrounding these pluralities of electric wires 30, and the corrugate tube 10 surrounding the plurality of electric wires 30 and the braided wire 20. Furthermore, a filling material 40 consisting of a material of higher heat conductivity than that air has is filled into the corrugate tube 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a shield conductive path and a method for manufacturing a shield conductive path.

Conventionally, when connecting devices such as an inverter device and a motor in an electric vehicle, a conductive path having a shield function (hereinafter also referred to as a shield conductive path) is used. As this type of conductive path, there is provided a so-called collective shield type in which a plurality of electric wires are collectively surrounded by a shield member made of a braid. Further, as in Patent Document 1, the shield member is protected. In order to achieve this, a configuration in which a flexible bellows-like corrugated tube is covered is employed. Thus, if the circumference | surroundings of a braided wire are coat | covered with a corrugated tube, while being able to protect a braided wire effectively, the whole electroconductive path can be set as the structure which has flexibility.
JP2004-172476

  By the way, in the structure which surrounds an electric wire with a corrugated tube as mentioned above, the heat dissipation with respect to the heat_generation | fever of an electric wire becomes a problem. That is, since an air layer having low thermal conductivity is interposed between the outer periphery of the electric wire and the inner wall of the corrugated tube, the air layer may block heat dissipation to the outside, and the inside of the corrugated tube may be heated. In order to suppress this, a method of increasing the conductor size of the electric wire is conceivable, but in this case, an increase in the size of the entire conductive path is inevitable.

  This invention is completed based on the above situations, Comprising: It aims at providing the structure which can improve heat dissipation effectively in the shield conductive path which surrounds an electric wire with a corrugated tube.

As means for achieving the above object, the invention according to claim 1 provides a shield conductive path,
Multiple wires,
A braided wire that collectively surrounds the plurality of electric wires;
A corrugated tube surrounding the plurality of electric wires and the braided wire;
Made of a material having a higher thermal conductivity than air, and a filler filled in the corrugated tube;
It is provided with.

The invention of claim 2 is the shield conductive path according to claim 1,
The filler is filled inside and outside the braided wire, respectively.

The invention of claim 3 is the shield conductive path according to claim 2,
The filler is characterized by extending inside and outside the braided wire through a mesh of the braided wire.

The invention according to claim 4 is the shield conductive path according to any one of claims 1 to 3,
The corrugated tube has an outer surface exposed to the outside air.

The invention according to claim 5 is the shield conductive path according to any one of claims 1 to 4,
The filler is characterized by having fluidity.

The invention of claim 6
A method for manufacturing a shield conductive path, comprising: a plurality of electric wires; a braided wire that collectively surrounds the plurality of electric wires; and a corrugated tube that surrounds the plurality of electric wires and the braided wire,
Arrangement step of arranging the plurality of electric wires and the braided wire inside the corrugated tube in a state of surrounding the plurality of electric wires by the braided wire,
An injection process for injecting a filler having a higher thermal conductivity than air into the corrugated tube;
It is provided with.

The invention of claim 7 is the method of manufacturing a shield conductive path according to claim 6,
In the injection step, the filler is injected into the inside and outside of the braided wire.

The invention of claim 8 is the method of manufacturing a shield conductive path according to claim 7,
The injection step is characterized in that the filler is injected into the braided wire and the injected filler is leaked to the outside of the braided wire through a mesh of the braided wire.

The invention of claim 9 is the method of manufacturing a shield conductive path according to claim 8,
In the injection step, the tip portion of the injection nozzle having a tip portion formed in a longitudinal shape is caused to enter the inside of the braided wire until reaching the intermediate position in the longitudinal direction of the corrugated tube or the opposite end position. The filler is injected from the tip.

  According to a tenth aspect of the present invention, in the method for manufacturing a shield conductive path according to any one of the sixth to ninth aspects, the injecting step injects the filler having fluidity.

<Invention of Claim 1>
According to invention of Claim 1, the heat | fever generate | occur | produced in the electric wire inside a corrugated tube comes to be transmitted to a corrugated tube via a filler. Since this filler has a higher thermal conductivity than air, the heat from the electric wire can be transmitted to the outside through the filler, and effective heat dissipation can be realized.

<Invention of Claim 2>
According to the invention of claim 2, since the filler is filled inside and outside the braided wire, the heat transfer to the outside is better as compared with the case where only one of them is filled.

<Invention of Claim 3>
According to the invention of claim 3, heat transfer is favorably generated from the inner side to the outer side of the braided wire, and the heat distortion can be effectively reduced.

<Invention of Claim 4>
According to invention of Claim 4, the heat dissipation of corrugated tube itself becomes high, and the heat | fever conducted with the filler will be discharge | released still more favorably.

<Invention of Claim 5>
According to the invention of claim 5, the entire shield conductive path can be made to have a flexible structure while enhancing the heat generation suppressing effect of the electric wire.

<Invention of Claim 6>
According to the invention of claim 6, it is possible to suitably manufacture a shield conductive path having a collective shield function and a braided wire protection function and capable of effectively radiating heat from the electric wire. .

<Invention of Claim 7>
According to the seventh aspect of the present invention, the filler can be uniformly injected into the corrugated tube.

<Invention of Claim 8>
According to the invention of claim 8, it becomes possible to satisfactorily fill the inside of the braided wire without using a complicated configuration or a complicated method. Further, the manufactured shield conductive path has a structure excellent in thermal conductivity and heat dissipation because the filler is arranged over the inside and outside of the braided wire through the mesh.

<Invention of Claim 9>
According to the ninth aspect of the present invention, it is possible to better realize the step of leaking the filler from the inside of the braided wire through the mesh.

<Invention of Claim 10>
According to invention of Claim 10, a filler can be inject | poured easily and suitably.

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to the drawings.
1. 1 is a schematic side cross-sectional view illustrating a shield conductive path 1 according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. It is B sectional drawing.

  As shown in FIG. 1, the shield conductive path 1 connects devices such as an inverter device and a motor in, for example, an electric vehicle and a hybrid vehicle. The plurality of wires 30 and the plurality of wires 30 are collectively connected. And the corrugated tube 10 surrounding the plurality of electric wires 30 and the braided wire 20.

  As shown in FIGS. 1 to 3, the electric wire 30 is a non-shield type electric wire in which the outer periphery of a core wire 31 made of metal (for example, aluminum alloy or copper alloy) is surrounded by an insulating coating 32 made of synthetic resin, The core wire 31 is composed of a stranded wire in which a plurality of thin wires (not shown) are close to each other in a spiral shape, or a rod-like single core wire. As shown in FIGS. 2 and 3, both the core wire 31 and the insulating coating 32 are true circles in the cross-sectional shape of the electric wire 30. In addition, as the material of the insulating coating 32, polypropylene, polyethylene, or the like is used.

  In addition, the electric wire side terminal which is not shown in figure can be connected to the terminal part of each electric wire 30. FIG. For example, the wire-side terminal can be configured such that a substantially first half portion is a flat plate shape long in the front-rear direction and a device connection portion in which a bolt hole is formed, and a substantially second half portion is a so-called open barrel-like wire connection portion. .

  The braided wire 20 configured as a shield member is a cylindrical wire in which fine metal wires are knitted in a mesh shape, and surrounds the three electric wires 30 together. The braided wire 20 can be stretched in the radial direction and stretched in the length direction due to the flexibility of the fine metal wires.

  The corrugated tube 36 is made of a synthetic resin, and has a bellows-like shape in which the protrusions 11 that extend in the radial direction and are arranged along the circumferential direction and the circumferential grooves 12 are alternately continuous. The protrusions 11 and the grooves 12 are arranged independently of each other. Further, the outer surface 10A of the corrugated tube 10 is exposed to the outside air (air). That is, a covering member such as a tape is not disposed on the outside of the corrugated tube 10, and both the outer surface of the protrusion 11 and the outer surface of the groove 12 are exposed to the outside air (air), thereby improving heat dissipation.

  The corrugated tube 10 is filled with a filler 40. The filler 40 is made of a synthetic resin material having a higher thermal conductivity than air. As this material, it is preferable to have low viscosity and fluidity in order to perform the injection process described later well, and considering that heat resistance is also required, a silicon-based resin is desirable, but other synthetic resins Materials can also be used.

  The degree of fluidity of the filler 40 may be such that it leaks through the opening when the opening at the end of the corrugated tube 10 is directed downward at room temperature, and the opening of the corrugated tube 10 at room temperature. It may be the degree of fluidity when it is pushed out by a hard member, etc. When the opening of the corrugated tube 10 is directed downward, the opening may be blocked by a shielding member such as a cap when the opening leaks through the opening.

  In this embodiment, the filler 40 is inside the braided wire 20 (ie, between the electric wire 30 and the braided wire 20) and outside (ie, between the outer periphery of the braided wire 20 and the inner periphery of the corrugated tube 10). More specifically, the filler 40 is filled into the inside and outside of the braided wire 20 through the mesh of the braided wire 20.

  As shown in FIGS. 1 and 2, the filler 40 is filled up to the back side of the protrusion 11 (in a form in contact with the entire inner wall of the protrusion 11), as shown in FIGS. 2 and 3. Thus, it fills up to the back side of the groove part 12 (in the form which contacts the whole back side of the groove part 12). That is, the filler 40 is filled in a form that contacts the entire inner wall of the corrugated tube 10.

  In the configuration of the present embodiment, a shield conductive path including a plurality of electric wires 30, a braided wire 20 that collectively surrounds the plurality of electric wires 30, and a corrugated tube 10 that surrounds the plurality of electric wires 30 and the braided wire 20. 1, since the corrugated tube 10 is filled with a filler 40 made of a material having a higher thermal conductivity than air, the heat generated in the electric wire 30 inside the corrugated tube 10 passes through the filler 40. It is transmitted to the corrugated tube 10. Since the filler 40 has a higher thermal conductivity than air, the heat from the electric wire 30 can be transmitted to the outside through the filler 40, and effective heat dissipation can be realized. .

  In addition, when the corrugated tube 10 is filled with the filler 40 in this manner, the heat burn around the electric wire 30 can be suppressed, and the electric wire size can be easily reduced. That is, even if the diameter of the electric wire is reduced, the influence of heat generation is reduced. Therefore, the electric wire can be easily reduced in diameter, and the shield conductive path itself can be easily reduced in size.

  Further, since the filler 40 is filled inside and outside the braided wire 20, the heat transfer to the outside is better than when only one of them is filled. That is, since the heat generated by the electric wire 30 is well transmitted to the filler 40 inside the braided wire 20 and this is transmitted well to the external filler 40, the heat distortion can be effectively suppressed.

  Further, since the filler 40 extends inside and outside the braided wire 20 through the mesh of the braided wire 20, heat transfer is favorably generated from the inside to the outside of the braided wire 20, thereby effectively reducing heat distortion. it can.

  Furthermore, since the corrugated tube 10 has an outer surface exposed to the outside air, the heat dissipation of the corrugated tube 10 itself is also increased, and the heat conducted by the filler 40 is more effectively released to the outside. .

  Moreover, since the filler 40 has fluidity, the shield conductive path 1 as a whole can have a flexible structure while enhancing the heat generation suppressing effect of the electric wire 30.

2. Manufacturing Method Next, a manufacturing method of the shield conductive path 1 will be described. FIG. 4 is an explanatory view for explaining an arrangement step in the manufacturing method, and FIG. 5 is an explanatory view for explaining an injection step. Moreover, FIG. 6 is explanatory drawing explaining the state which the injection | pouring process was complete | finished.

  The shield conductive path 1 described above is manufactured by performing an arrangement process of arranging the plurality of electric wires 30 and the braided wire 20 and an injection process of injecting the filler 40 inside the corrugated tube 10.

  In the arranging step, as shown in FIG. 4, the braided wire 20 and the electric wires 30 are arranged in a state in which a plurality of electric wires are surrounded by the braided wires 20 inside the corrugated tube 10 manufactured by a known method. The arrangement order may be such that the plurality of electric wires 30 are passed through the braided wire 20 after passing the braided wire 20 into the corrugated tube 10, and conversely, after the electric wires 30 are arranged inside the corrugated tube 10, The braided wire 20 may be arranged so as to surround the electric wire 30 within the corrugated tube 10. Alternatively, the electric wire 30 may be previously surrounded by the braided wire 20 and the electric wire 30 and the braided wire 20 may be passed through the corrugated tube 10.

  In the injection step, the filler 40 having a higher thermal conductivity than air is injected into the corrugated tube 10 in which the plurality of electric wires 30 and the braided wire 20 are arranged in the arrangement step. Specifically, as shown in FIG. 4, an injection nozzle 50 having a longitudinal end 51 is used, and the resin is discharged from the injection nozzle 50 toward the inside of the corrugated tube 10.

  In this injection step, the filler 40 is injected inside and outside the braided wire 20. Specifically, as shown in FIG. 5, in the braided wire 20, a filler 40 having fluidity is injected between the braided wire 20 and the electric wire 30, and the injected filler 40 is injected into the braided wire 20. Then, it is leaked to the outside of the braided wire 20 through the mesh of the braided wire 20.

  In the present embodiment, as described above, the injection nozzle 50 in which the distal end portion 51 is formed in a longitudinal shape is used, and the distal end portion 51 of the injection nozzle 50 is placed in the longitudinal direction of the corrugated tube 10 inside the braided wire 20. The tube 10 is pushed back to the pushing end 10 side while injecting the filler 40 having fluidity from the tip 51 into the direction facing end (the facing end as viewed from the longitudinal end 10B inside the corrugated tube 10). .

  When such an injection method is used, since the tip of the nozzle 50 is not blocked by the injected filler 40, the filler 40 is pushed out of the nozzle 50 without difficulty and enters the braided wire 20, and then the braided wire 20 It gradually overflows to the outside. In addition, the braided wire 20 is expanded from the inside to the outside by the flow of the filler 40. For this reason, the mesh of the braided wire 20 is also enlarged, the flow resistance is reduced, and it is easy to overflow. As a result, the overflowing filler 40 enters the back side of the protrusion 11 and the back side of the groove 12 and is uniformly filled as shown in FIG.

  According to the manufacturing method of this embodiment, it is possible to satisfactorily manufacture a shield conductive path that has a collective shield function and a protection function for the braided wire 20 and that can effectively dissipate heat from the electric wire.

  In particular, in the injection step, the filler 40 is injected into the inside and outside of the braided wire 20, so that the filler 40 can be uniformly injected into the corrugated tube 10.

  In the injection step, the filler 40 is injected into the braided wire 20, and the injected filler 40 is leaked to the outside of the braided wire 20 through the mesh of the braided wire 20. Accordingly, the filler 40 can be satisfactorily filled into the corners inside and outside the braided wire 20 without using a complicated configuration or a complicated method. Moreover, since the manufactured shield conductive path 1 becomes a structure by which the filler 40 is distribute | arranged over the braided wire 20 inside and outside through a mesh, it becomes a structure excellent in thermal conductivity and heat dissipation.

  Further, in the injection step, an injection nozzle 50 having a front end portion 51 formed in a longitudinal shape is used, the front end portion 51 is caused to enter the middle position in the longitudinal direction of the corrugated tube 10 inside the braided wire 20, and the filler 40 is supplied. Injecting. In this way, the step of leaking the filler 40 from the inside of the braided wire 20 through the mesh can be realized better.

  Further, in the injection step, a filler having fluidity is injected, and according to this, the filler can be easily and suitably injected.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

(1) In the above embodiment, the corrugated tube 10 has a bellows-like form in which the independent circumferential protrusions 11 and the independent circumferential grooves 12 are alternately arranged. For example, the protrusions and the grooves are spiral. It may be configured as follows.
(2) In the above embodiment, the number of conductors inserted into one corrugated tube 10 is three. However, according to the invention, the number of conductors held in one corrugated tube 10 is one, Any of two, four or more may be used.
(3) In the above-described embodiment, the configuration in which the filler 40 is directly disposed around the electric wire 30 is illustrated. Then, a filler may be disposed around the holding body after being surrounded by the surrounding body.
(4) In the above embodiment, the filler 40 is injected into the braided wire 20 and leaked to the outside through the mesh. However, the filler 40 is independently provided inside and outside the braided wire 20. It may be injected.

1 is a schematic side sectional view illustrating a shield conductive path according to a first embodiment of the invention. AA sectional view of FIG. BB sectional view of FIG. Explanatory drawing explaining an arrangement process Explanatory drawing explaining the injection process Explanatory drawing explaining the state which the injection | pouring process was complete | finished

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Shield conductive path 10 ... Corrugated tube 20 ... Braided wire 30 ... Electric wire 40 ... Filler 50 ... Injection nozzle 51 ... Tip part

Claims (10)

Multiple wires,
A braided wire that collectively surrounds the plurality of electric wires;
A corrugated tube surrounding the plurality of electric wires and the braided wire;
Made of a material having a higher thermal conductivity than air, and a filler filled in the corrugated tube;
A shield conductive path characterized by comprising:   The shield conductive path according to claim 1, wherein the filler is filled inside and outside the braided wire.   The shield conductive path according to claim 2, wherein the filler extends inside and outside the braided wire through a mesh of the braided wire.   4. The shield conductive path according to claim 1, wherein an outer surface of the corrugated tube is exposed to outside air. 5.   The shield conductive path according to any one of claims 1 to 4, wherein the filler has fluidity. A method of manufacturing a shield conductive path having a plurality of electric wires, a braided wire that collectively surrounds the plurality of electric wires, and a corrugated tube that surrounds the plurality of electric wires and the braided wire,
Arrangement step of arranging the plurality of electric wires and the braided wire inside the corrugated tube in a state of surrounding the plurality of electric wires by the braided wire,
An injection process for injecting a filler having a higher thermal conductivity than air into the corrugated tube;
A method of manufacturing a shield conductive path, comprising:   The said injection | pouring process inject | pours the said filler into the inside and the exterior of the said braided wire, The manufacturing method of the shield conductive path of Claim 6 characterized by the above-mentioned.   8. The injecting step injects the filler into the braided wire and causes the injected filler to leak out of the braided wire through a mesh of the braided wire. The manufacturing method of the shield conductive path of description.   In the injection step, the tip portion of the injection nozzle having a tip portion formed in a longitudinal shape is caused to enter the inside of the braided wire until reaching the intermediate position in the longitudinal direction of the corrugated tube or the opposite end position. The method for manufacturing a shield conductive path according to claim 8, wherein the filler is injected from a tip portion.   The method for manufacturing a shield conductive path according to claim 6, wherein the filling step injects the filler having fluidity.

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