JP2006260898A - Shield conductive line and manufacturing method for sheet-like conductive line - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve heat radiating property of a shield conductive path using a pipe. <P>SOLUTION: In this shield conductive line, a plurality of wires 10 are inserted in a metal pipe 20 to shield and protect the wires 10 with the pipe 20 and the pipe 20 is arranged along periphery of the plurality of wires 10. The heat generated by the wires 10 is transmitted from the periphery of the wires 10 to an inner circumference of the pipe 20 and emitted from the periphery of the pipe 20 to the air. Since the pipe 20 is arranged along the periphery of the wires 10, a gap between the periphery of the wires 10 and the inner circumference of the pipe 20 becomes small, resulting in excellent heat transfer efficiency from the wires 10 to the pipe 20. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

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

  The shield conductive path using non-shielded wires has a structure in which a plurality of non-shielded wires are shielded collectively by surrounding them with a shield member consisting of a tubular braided wire made of fine metal wires knitted in a mesh shape. Is considered. As a method for protecting the shield member and the electric wire in this type of shield conductive path, generally, a means for surrounding the shield member with a synthetic resin protector is used. However, when the protector is used, there is a problem that the number of parts increases.

Therefore, the applicant of the present application has proposed a structure in which a non-shielded electric wire is inserted into a metal pipe as described in Patent Document 1. According to this structure, since the pipe exhibits the function of shielding the electric wire and the function of protecting the electric wire, there is an advantage that the number of parts can be reduced as compared with the shield conductive path using the shield member and the protector.
JP 2004-171952 A

In shielded conductive paths using pipes, the heat generated by the wires during energization is blocked by air with low thermal conductivity and is not easily transmitted to the pipes. Therefore, the heat generated in the electric wire tends to be trapped inside the pipe and the heat dissipation tends to be low.
Here, the amount of heat generated when a predetermined current flows through the conductor decreases as the cross-sectional area of the conductor increases, and the temperature rise value of the conductor due to heat generation is suppressed as the heat dissipation of the conductive path increases. Therefore, in an environment where an upper limit is set for the temperature rise value of the conductor, in the case of the shield conductive path with low heat dissipation efficiency as described above, it is necessary to increase the cross-sectional area of the conductor to suppress the heat generation amount.
However, increasing the cross-sectional area of the conductor means that the shield conductive path becomes larger in diameter and becomes heavier.
This invention is completed based on the above situations, Comprising: It aims at improving the heat dissipation in the shield conductive path using a pipe.

  As a means for achieving the above object, the invention of claim 1 includes a plurality of electric wires formed by surrounding a conductor with an insulating coating, and a metal pipe, and the plurality of electric wires are disposed in the pipe. In this case, the wire is shielded and protected by the pipe, and the pipe is shaped along the outer periphery of the plurality of wires.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the inner periphery of the pipe is brought into surface contact with the outer periphery of the electric wire.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the plurality of electric wires are arranged adjacent to each other, and the adjacent electric wires are in surface contact with each other. It is characterized by a non-circular cross-sectional shape.

  The invention of claim 4 comprises a plurality of electric wires formed by surrounding a conductor with an insulating coating, and a metal pipe, and the plurality of electric wires are inserted into the pipe so that the electric wires are connected to the pipe. A method of manufacturing a sheet-shaped conductive path that is shielded and protected by inserting the plurality of electric wires through the pipe and deforming the pipe into a shape along the outer periphery of the electric wire. However, it has characteristics.

  According to a fifth aspect of the present invention, in the apparatus according to the fourth aspect, the pipe is deformed by pressing a plurality of rollers in the radial direction against the outer periphery of the pipe while moving the pipe in the axial direction. Has characteristics.

  The invention of claim 6 is the one according to claim 4 or 5, wherein a load measuring means is interposed between the roller and a driving means for applying a driving force in the pressing direction to the roller. It is characterized in that the amount of movement of the roller toward the pipe is managed based on the measurement value of the load measuring means.

<Invention of Claim 1>
The heat generated in the electric wire is transmitted from the outer periphery of the electric wire to the inner periphery of the pipe and is released from the outer periphery of the pipe to the atmosphere. Since the pipe is shaped along the outer periphery of the electric wire, the distance between the outer periphery of the electric wire and the inner periphery of the pipe is small, and heat transfer efficiency from the electric wire to the pipe is excellent.

<Invention of Claim 2>
Since the inner periphery of the pipe is brought into surface contact with the outer periphery of the electric wire, the heat transfer efficiency from the electric wire to the pipe is further improved.

<Invention of Claim 3>
In the case where air exists between adjacent electric wires, there is a concern that heat is generated in the gaps between the electric wires due to the heat insulation action of the air. Since they are in contact with each other, it is possible to avoid heat stagnation in the gap between the electric wires.

<Invention of Claim 4>
According to the sheet-like conductive path manufactured by the method of the present invention, heat generated in the electric wire is transmitted from the outer periphery of the electric wire to the inner periphery of the pipe, and is released from the outer periphery of the pipe to the atmosphere. Since the pipe is shaped along the outer periphery of the electric wire, the distance between the outer periphery of the electric wire and the inner periphery of the pipe is small, and heat transfer efficiency from the electric wire to the pipe is excellent.

<Invention of Claim 5>
Since the pipe is deformed while moving the pipe, it is possible to cope with a plurality of sheet-like conductive paths having different pipe lengths.

<Invention of Claim 6>
In the deformation region of the pipe that is pressed by the roller, a reaction force against the pressing force from the roller acts from the pipe side to the roller side, and this reaction force is measured by the load measuring means. Since the reaction force from the deformation area indicates the degree of deformation, the state of deformation can be managed accurately. Thereby, a uniform pressing force can be applied over the entire length of the pipe, and a constant cross-sectional shape can be obtained over the entire length of the pipe.

<Embodiment 1>
A first embodiment of the present invention will be described below with reference to FIGS. 1 to 3. The shield conductive path A of the first embodiment is routed between devices (not shown) such as a battery, an inverter, and a motor that constitute a power source for traveling in an electric vehicle, for example. The non-shield type electric wire 10 is inserted into a pipe 20 having both a collective shielding function and an electric wire protection function.

  The electric wire 10 has a form in which the outer periphery of a conductor 11 made of metal (for example, aluminum alloy or copper alloy) is surrounded by an insulating coating 12 made of synthetic resin, and the conductor 11 includes a plurality of thin wires (not shown). Consists of twisted wires that are close together in a spiral. As for the cross-sectional shape at the beginning of manufacture of the electric wire 10, as shown in FIG. 3, the conductor 11 is a perfect circle, and the insulating coating 12 is also a perfect circle. As will be described later, in a state where the pipe 20 is processed and deformed (a state where the shield conductive path A is completed), the three electric wires 10 are stacked (when the center of the electric wire 10 is tied, a substantially equilateral triangle is formed. It is in a state circumscribing the drawing form. Further, the conductor 11 and the insulating coating 12 have a shape in which two adjacent portions on the outer peripheral edge of a perfect circle are cut into a comb shape (bow shape). As shown in FIG. Are arranged in a state where the notches 13 are in surface contact with each other.

  The pipe 20 is made of metal (for example, an aluminum alloy or a copper alloy) and has a higher thermal conductivity than air. As shown in FIG. 2, the cross-sectional shape of the pipe 20 at the beginning of manufacture is a substantially equilateral triangle with the top portion having an arc shape. At this time, the radius of curvature of the inner circumference of the arc portion 21 is slightly larger than the outer diameter of the electric wire 10 at the time of manufacture. Thus, by making the pipe 20 into a substantially equilateral triangle, the three electric wires 10 can be maintained in a substantially constant positional relationship without being spirally twisted in the pipe 20. The positional relationship with 10 can be kept almost constant. In the first embodiment, the pipe 20 has a triangular shape. However, when the number of electric wires is four, the positional relationship of the four electric wires can be kept substantially constant if the pipe 20 has a substantially square shape. it can. In a state where the pipe 20 is processed and deformed (a state where the shield conductive path A is completed), as shown in FIG. 1, the central portions of the three straight portions 22 in the original shape of the pipe 20 are moved to the center side. By forming the concave portion 23 in this way, the three arcuate fitting portions 24 are connected at a 120 ° pitch. And the electric wire 10 is accommodated in the surface contact state inside each arc-shaped fitting part 24, respectively.

  A processing machine 30 for processing the pipe 20 will be described. As shown in FIG. 3, the processing machine 30 is arranged so that the outer peripheral surface thereof corresponds to the three recesses 23 and the rotation shaft 32 is directed in a direction intersecting the moving direction of the pipe 20 (the axial direction of the pipe 20). The three rollers 31 are provided. The outer peripheral surface of the roller 31 has a shape in which a central portion in the width direction protrudes in order to form the recess 23. A space surrounded by the three rollers 31 is a processing space 33 for allowing the pipe 20 to pass therethrough. The rotating shaft 32 of each roller 31 is attached to a hydraulic cylinder 34 (driving means that is a constituent feature of the present invention). The hydraulic cylinder 34 includes a cylinder body 35, a piston (not shown) that moves up and down inside the cylinder body 35, and a rod 36 that is fixed to the piston and protrudes outside the cylinder body 35. A load cell 37 (load measuring means which is a constituent element of the present invention) for measuring a compressive load in the expansion / contraction direction of the rod 36 (the radial direction of the pipe 20) is attached to the tip of the rod 36. A bearing body 38 is fixed to the front end surface of the load cell 37, and the rotating shaft 32 is rotatably supported by the bearing body 38. The hydraulic cylinder 34 moves the roller 31 and the load cell 37 toward and away from the pipe 20 by extending and contracting the rod 36 by supplying and discharging the hydraulic oil. Further, the load cell 37 detects a reaction force that is radially outward from the pipe 20 when the roller 31 presses the outer periphery of the pipe 20.

Next, a method for manufacturing the shield conductive path A will be described.
In manufacturing, first, three electric wires 10 having a true circular cross section are inserted into a pipe 20 manufactured as shown in FIG. At this time, although the three electric wires 10 are arranged in a stacked manner, the electric wires 10 can be easily inserted between the electric wires 10 and between the outer periphery of the electric wires 10 and the inner periphery of the pipe 20. Clearance is vacant. Each electric wire 10 is arranged substantially concentrically with respect to the arc portion 21 of the pipe 20.

  From this state, the pipe 20 is moved in the axial direction to enter the machining space 33 surrounded by the three rollers 31. Then, the outer periphery of the roller 31 presses the linear portion 22 of the pipe 20, and by this pressing action, a concave portion 23 is formed in the linear portion 22, and the concave portion 23 enters a groove-like portion constituted by the adjacent electric wires 10. At the same time, the arc portion 21 closely contacts the outer periphery of the electric wire 10 while reducing the diameter. In addition, the concave portion 23 and the circular arc portion 21 press the three electric wires 10 toward the center while being deformed, and by this pressing action, the electric wires 10 are deformed into a shape in which a part of the outer periphery is cut into an arcuate shape. Then, the cutout portions 13 are brought into close contact so as to be in surface contact with each other. As described above, the pipe 20 is plastically deformed into a shape along the arcuate region on the outer periphery of the electric wire 10 and the shield conductive path A is completed.

  The degree of deformation of the pipe 20 is determined by the pressing force of the roller 31 against the pipe 20, but in this embodiment, the roller 31 and the roller 31 are driven in the pressing direction as means for managing the pressing force of the roller 31. A load cell 37 as a load measuring means is interposed between the rod 36 of the hydraulic cylinder 34 to which force is applied, and the pushing amount (intrusion amount) of the roller 31 into the pipe 20 is managed based on the measured value of the load cell 37. I am doing so. In the pressing region of the roller 31 in the pipe 20, a reaction force from the pipe 20 and the electric wire 10 against the pressing force of the roller 31 acts on the roller 31 side, and this reaction force is measured by the load cell 37. As the degree of deformation of the pipe 20 and the electric wire 10 increases, the reaction force from the pipe 20 side also increases, and the value of this reaction force is measured by the load cell 37. Then, by adjusting the penetration depth of the roller 31 based on this measured value, the deformation amount (shape at the time of completion of manufacture) of the pipe 20 and the electric wire 10 can be accurately managed.

Next, the operation and effect of this embodiment will be described.
When the electric wire 10 is energized, heat is generated in the conductor 11 of the electric wire 10, and this generated heat is transmitted from the conductor 11 to the insulating coating 12, and from the outer periphery of the insulating coating 12 to the arcuate fitting portion 24 of the pipe 20. It is transmitted to the inner periphery and released from the outer periphery of the pipe 20 into the atmosphere. In the present embodiment, since the pipe 20 has an arc shape along the outer periphery of the electric wire 10 and the arc-shaped fitting portion 24 of the pipe 20 is brought into surface contact with the outer periphery of the electric wire 10, the outer periphery of the electric wire 10 and the inner periphery of the pipe 20. , And the heat transfer efficiency from the electric wire 10 to the pipe 20 is excellent. Therefore, as shown in FIG. 6, the shield conductive path A of the present embodiment has a heat generated in the electric wire 10 as compared with a conventional shield conductive path in which a large air layer 102 is interposed in the gap between the electric wire 100 and the pipe 101. It has excellent performance for releasing

  The amount of heat generated when a predetermined current is passed through the conductor 11 decreases as the cross-sectional area of the conductor 11 increases, and the temperature rise value of the conductor 11 due to heat generation is suppressed as the heat dissipation of the conductive path increases. Therefore, in an environment where an upper limit is set for the temperature rise value of the conductor 11 as in an electric vehicle, in the case of the shield conductive path A having a high heat dissipation efficiency as in this embodiment, the heat generation allowance in the conductor 11 is increased. Therefore, the cross-sectional area of the conductor 11 can be reduced. By reducing the cross-sectional area of the conductor 11, the shield conductive path A can be reduced in diameter and weight.

In the present embodiment, since the inner periphery of the pipe 20 is brought into surface contact with the outer periphery of the electric wire 10, the heat transfer efficiency from the electric wire 10 to the pipe 20 is further improved.
In addition, when there is air between adjacent electric wires, there is a concern that heat may be generated in the gap between the electric wires due to the heat insulating action of the air, but in this embodiment, the outer periphery of the adjacent electric wires 10 Since the surfaces (notch portions 13) are in surface contact with each other, it is possible to avoid thermal stagnation in the gap between the electric wires 10.
Further, when the shield conductive path A is mounted on an automobile, abnormal noise may occur or the insulating coating 12 of the electric wire 10 may be damaged due to the vibration of the electric wire 10 in the pipe 20 during traveling. Although concerned, in this embodiment, since the electric wire 10 is being fixed so that it may not move within the pipe 20, generation | occurrence | production of the abnormal noise resulting from a vibration and damage to the insulation coating 12 of the electric wire 10 can be prevented. .

  Further, when manufacturing the shield conductive path A (deformation processing of the pipe 20), the three rollers 31 are pressed in the radial direction against the outer periphery of the pipe 20 while moving the pipe 20 in the axial direction (length direction). Since the pipe 20 is deformed in this way, it is possible to cope with a plurality of shield conductive paths A having different lengths of the pipe 20. Further, by changing the positions of the three rollers 31, it is possible to cope with a plurality of shield conductive paths A having different outer diameters of the pipe 20.

  In addition, a load cell 37 as a load measuring unit is interposed between the roller 31 and a hydraulic cylinder 34 which is a driving unit that applies a driving force in the pressing direction to the roller 31, and is pressed by the roller 31 in the pipe 20. In the deformation region, the reaction force against the pressing force from the roller 31 is measured by the load cell 37. Since the reaction force from the deformation region indicates the degree of deformation, the deformation state of the pipe 20 and the electric wire 10 can be accurately managed based on the measurement value of the load cell 37. Thereby, a uniform pressing force can be applied over the entire length of the pipe 20, and a constant cross-sectional shape can be formed over the entire length of the pipe 20.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIG. The shield conductive path B of the second embodiment is configured such that the electric wire 40 maintains a perfect circle even when the pipe 50 is formed in a shape along the outer periphery of the electric wire 40. Therefore, adjacent electric wires 40 are in a line contact or point contact state. Since the configuration other than the above is the same as that of the first embodiment, the same configuration is denoted by the same reference numeral, and description of the structure, operation, and effect is omitted.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to FIG. The pipe 60 of the shield conductive path C according to the third embodiment is made of metal (for example, an aluminum alloy or a copper alloy), and has a generally oval cross section as a whole. In detail, a pair of concave portions 62 is formed in each of the portions that are the pair of straight portions 61 constituting the oval shape, and the concave portions 62 cause the pipe 60 to have circles positioned at both left and right ends. An arcuate fitting part 63 and a pair of arcuate clamping parts 64 positioned between the arcuate fitting parts 63 are formed. In a state where the electric wires 70 are inserted into the pipe 60, the three electric wires 70 are arranged in a line in the length direction of the pipe 60, and the electric wires 70 that remain in a true circle are fitted into the arc-shaped fitting portion 63. At the same time, a completely circular electric wire 70 is fitted between the pair of arcuate sandwiching portions 64. The outer periphery of each electric wire 70 is in surface contact with the inner periphery of the pipe 60, and the outer periphery of the adjacent electric wires 70 is in line contact or point contact. Since the configuration other than the above is the same as that of the first embodiment, the same configuration is denoted by the same reference numeral, and description of the structure, operation, and effect is omitted.

<Other embodiments>
The present invention is not limited to the embodiment 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, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) In the above embodiment, three electric wires are inserted into one pipe, but according to the present invention, the number of electric wires inserted into one pipe is one, two, four or more. Also good.
(2) In the above embodiment, the inner periphery of the pipe is brought into surface contact with the outer periphery of the electric wire. However, according to the present invention, the pipe, the inner periphery and the outer periphery of the electric wire are not contacted, line contact, or point contact. It is good. In this case, the gap between the electric wire and the pipe may be filled with a filler having a higher thermal conductivity than air.
(3) In the above-described embodiment, the pipe is deformed after the electric wire is inserted into the pipe. However, according to the present invention, the electric wire may be inserted into a pipe that has been previously formed into a shape along the outer periphery of the electric wire.
(4) In the above embodiment, no air pool is generated in the gap with the electric wire in the pipe. However, according to the present invention, a small volume of air pool may remain in the gap with the electric wire in the pipe. .
(5) In the above embodiment, the pipe is deformed while moving in the axial direction without moving the roller. However, according to the present invention, the pipe is deformed while rotating the roller without moving the pipe. May be.
(6) In the above embodiment, the pipe is deformed while being moved using a roller. However, according to the present invention, the pipe may be deformed by pressing a die in the radial direction against the fixed pipe.
(7) In the above embodiment, the conductor of the electric wire is a stranded wire. However, according to the present invention, the conductor may be a single core wire.

Sectional drawing of the shield conductive path of Embodiment 1 Cross section of the pipe before molding Cross-sectional view showing the processing process of pipes Sectional drawing of the shield conductive path of Embodiment 2. Sectional drawing of the shield conductive path of Embodiment 3 Cross-sectional view of compliant conductive shield path

Explanation of symbols

A ... Sheet-like conductive path B, C ... Sheet-like conductive path 10 ... Electric wire 11 ... Conductor 12 ... Insulation coating 20 ... Pipe 31 ... Roller 34 ... Hydraulic cylinder (driving means)
37 ... Load cell (load measuring means)
40, 70 ... Electric wire 50, 60 ... Pipe

Claims (6)

A plurality of electric wires formed by surrounding a conductor with an insulating coating;
With metal pipes,
By inserting the plurality of electric wires into the pipe, the electric wire is shielded and protected by the pipe.
A shield conductive path, wherein the pipe is shaped along the outer periphery of the plurality of electric wires. The shield conductive path according to claim 1, wherein the inner periphery of the pipe is in surface contact with the outer periphery of the electric wire. The plurality of electric wires are arranged so as to be adjacent to each other,
The shield conductive path according to claim 1 or 2, wherein the adjacent electric wires have a non-circular cross-sectional shape so that their outer peripheral surfaces are in surface contact with each other. A plurality of electric wires formed by surrounding a conductor with an insulation coating and a metal pipe, and by inserting the plurality of electric wires into the pipe, the electric wires are shielded and protected by the pipe. A method for producing a sheet-like conductive path,
Inserting the plurality of electric wires through the pipe,
A method of manufacturing a shield conductive path, wherein the pipe is deformed so as to have a shape along an outer periphery of the electric wire. The method for manufacturing a shield conductive path according to claim 4, wherein the pipe is deformed by pressing a plurality of rollers in a radial direction against the outer periphery of the pipe while moving the pipe in the axial direction. A load measuring means is interposed between the roller and a driving means for applying a driving force in the pressing direction to the roller,
6. The method for manufacturing a shield conductive path according to claim 4, wherein the amount of movement of the roller toward the pipe is managed based on a measurement value of the load measuring means.

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