JP2008071645A - Conductor and manufacturing method thereof - Google Patents

Abstract

The present invention provides a conductor capable of easily treating the end of a pipe and a method of manufacturing the conductor.
A bushing is fitted to a cut end of a straight pipe region of a pipe. Thereby, even if burrs or burrs are generated, the cut end portion of the straight pipe region 33 is covered by the bushing 34, so that the resin layer 12 of the cable 13 can be prevented from being damaged. As a result, it is possible to prevent the insulation of the cable 13 from being lowered. Thus, the pipe 14 can be easily processed by a simple operation of fitting the bushing 34.
[Selection] Figure 1

Description

  The present invention relates to a conductor and a manufacturing method thereof.

Conventionally, a conductor described in Patent Document 1 has been known. This is a structure in which an electric wire formed by coating a core wire with an insulating resin layer is inserted into a metal pipe. According to this structure, since the outer periphery of the electric wire is surrounded by the metal pipe, not only can a foreign object collide with the electric wire and be damaged, but also an electromagnetic shielding effect by the metal pipe can be expected.
JP 2004-171952 A

  By the way, when the electric wire is energized, heat corresponding to a value obtained by multiplying the resistance value of the core wire by the square of the current value is generated. The usable range of the electric wire is determined by the temperature rise of the insulating resin layer caused by this heat. The heat generated in the core wire is dissipated to the outside through the heat transfer path from the core wire to the insulating resin layer and from the pipe to the ambient air. To suppress the temperature rise caused by the heat generation, reduce the resistance value of the core wire. There is no choice but to increase the heat conductivity of the heat transfer path to increase heat dissipation. In order to reduce the resistance value of the core wire, the core wire is made thick. However, this leads to an increase in the weight and cost of the electric wire, and there is a situation that it is difficult to adopt in a situation where a reduction in weight is required.

  However, in terms of heat dissipation, the conductor using the above-described pipe has a great weak point. That is, since the conductor is manufactured by inserting an electric wire into a metal pipe, an air layer is necessarily interposed between the electric wire and the pipe. For this reason, the heat generated in the core wire is transferred to the insulating resin layer, and when the surface temperature rises, it is blocked by air with low thermal conductivity and becomes difficult to be transferred to the pipe. It rises. This means that this type of conductor does not have sufficient heat dissipation, and as a result, even if weight and cost are sacrificed, it is necessary to secure a large cross-sectional area of the core wire and suppress the generation of heat. means.

  Under these circumstances, various attempts have been made in recent years to improve the heat dissipation of this type of conductor. For example, after the electric wire is inserted into the pipe, the pipe is recessed inward in the thickness direction to form an adhesion portion that adheres closely to the outer peripheral surface of the insulating resin layer, so that the heat generated from the electric wire is adhered to the adhesion portion. It is considered to transmit directly to the pipe via Thereby, it becomes possible to improve the thermal conductivity from the electric wire to the pipe, and it is possible to prevent heat from being trapped in the pipe.

  However, the above conductor has a problem in that it is difficult to remove burrs and burrs generated at the cut end of the pipe when the end of the pipe is cut by a predetermined length to expose the wire end. . This is because the above-mentioned close contact portion is in close contact with the insulating resin layer, and burrs and burrs formed in this close contact portion are also in close contact with the insulating resin layer, so that the insulating resin layer is not damaged. This is because it is not easy to remove them. When the conductor is used with these burrs and burrs remaining, there is a concern that the burrs and burrs may bite into the insulating resin layer due to vibrations and the like, and the insulation of the electric wire will be lowered.

  This invention is completed based on the above situations, Comprising: It aims at providing the conductor which can process the edge part of a pipe easily, and its manufacturing method.

  As means for achieving the above object, the invention of claim 1 is a method of manufacturing a conductor, wherein a cable having a resin layer provided on the outer periphery of a conductive line is inserted into a metal pipe. An insertion step, and a spiral groove pipe portion in which the pipe is brought into close contact with the resin layer on the inner peripheral side of the spiral groove by partially pressing the pipe while surrounding the outer periphery of the pipe to form a spiral groove A spiral groove machining step that is intermittently formed across a straight pipe region not forming the spiral groove, and the straight pipe is formed on both sides of the spiral groove pipe portion by cutting the pipe together with the cable in the straight pipe region. A first pipe cutting step in which a part of the region is located, and the end of the cable is exposed by cutting off the pipe of a predetermined length from the end of the cut straight pipe region. A second pipe cutting step that executes a bushing fitted step of fitting the bushing covering the cut end into the pipe.

  Invention of Claim 2 is a manufacturing method of Claim 1, Comprising: The said electrically conductive line is an insulated wire which provided the insulating resin layer in the outer periphery of a core wire, Comprising: The said insulated wire is prior to the said cable insertion process. A cable forming step of bundling a plurality of pieces and covering them with the resin layer is executed.

  Invention of Claim 3 is the manufacturing method of Claim 1 or Claim 2, Comprising: In the said cable insertion process, the said clearance gap produces so that a clearance gap may arise between the outer peripheral surface of the said cable, and the inner peripheral surface of the said pipe. The outer diameter of the cable is set.

  Invention of Claim 4 is a manufacturing method in any one of Claim 1 thru | or 3, Comprising: In the said cable insertion process, the outer periphery of the said cable is bent, bending a metal plate along the outer peripheral surface of the said cable. A pipe into which the cable is inserted is formed by surrounding and welding the edges of the metal plates.

  The invention of claim 5 is a conductor, a cable provided with a resin layer on the outer periphery of the conductive line, a metal pipe surrounding the outer peripheral surface of the cable, and a predetermined length from at least one end of the pipe The pipe is adhered to the resin layer on the inner circumferential side of the spiral groove by forming the spiral groove by partially pressing the pipe while going around the outer periphery of the pipe. A spiral groove pipe portion, a straight pipe region that is left in a predetermined length from at least one end of the pipe, and an end of the straight pipe region of the pipe in which the spiral groove pipe portion is not formed. And a bushing fitted to cover the part.

  Invention of Claim 6 is a thing of Claim 5, Comprising: The said electrically conductive line is an insulated wire which provided the insulating resin layer in the outer periphery of a core wire, and the said cable bundles the said insulated wire and bundles together. It is covered with the resin layer.

  The invention according to claim 7 is the invention according to claim 5 or 6, wherein the outer diameter of the cable is set so that a gap is formed between the outer peripheral surface of the cable and the inner peripheral surface of the pipe. Has been.

  Invention of Claim 8 is a thing in any one of Claim 5 thru | or 7, Comprising: In the straight pipe | tube area | region of the said pipe, the said bushing is the inner peripheral surface of the said pipe, and the outer peripheral surface of the said resin layer Is in contact with both.

<Invention of Claim 1>
According to the invention of claim 1, the bushing is fitted to the cut end portion of the pipe. This bushing can prevent the resin layer of the cable from being damaged by burrs or burrs even if burrs or burrs remain at the cut end of the pipe. As described above, according to the first aspect of the present invention, the end portion of the pipe can be easily processed by a simple operation of fitting the bushing to the cut end portion of the pipe.

<Invention of Claims 2 and 6>
When the inner peripheral surface of the pipe and the resin layer are in close contact with each other, a pressing force is applied to the resin layer from the pipe. According to the second and sixth aspects of the present invention, since the pressing force applied from the pipe is absorbed by the insulating resin layer covering the outer periphery of the core wire, the core wire is prevented from being deformed or disconnected by the pressing force. it can.

<Invention of Claim 3 and Claim 7>
When a pipe is cut with a pipe cutter, burrs are generated on the inner surface side of the pipe. For this reason, in a conductor with a configuration in which the inner peripheral surface of the pipe and the outer peripheral surface of the cable are in contact, there is a concern that the resin layer of the cable may be damaged by burrs generated on the inner surface side of the pipe. Cannot be used.

  According to the third and seventh aspects of the present invention, in the straight pipe region, since there is a gap between the outer peripheral surface of the cable and the inner peripheral surface of the pipe, the resin layer of the cable is prevented from being damaged by burrs. It becomes possible, and a pipe cutter can be used for cutting a pipe. As a result, the efficiency of pipe cutting work can be improved.

  Also, burrs generated on the inner surface of the pipe can be removed by inserting a file or a tool for removing burrs into the gap between the outer peripheral surface of the cable and the inner peripheral surface of the pipe. Burrs and burrs can be easily removed without damaging the layers.

<Invention of Claim 4>
For example, if a cable is to be inserted into a pipe formed in a cylindrical shape in advance, the end portion of the cable may be caught on the inner peripheral surface of the pipe inside the pipe, and the working efficiency of the cable insertion process is reduced. There is concern.

  According to the invention of claim 4, since it is not necessary to insert the cable into the pipe, the working efficiency of the cable insertion process can be improved.

<Invention of Claim 5>
If the end portion of the straight pipe region of the pipe is exposed, there is a concern that the end portion of the straight pipe region is in contact with the resin layer of the cable due to vibration or the like, so that the resin layer of the cable is damaged.

  According to the invention of claim 5, since the end portion of the straight pipe region of the pipe is covered with the bushing, the end portion of the straight pipe region comes into contact with the resin layer of the cable due to vibration or the like and damages the resin layer. Can be prevented.

<Invention of Claim 8>
In the straight pipe region of the pipe, the inner surface of the pipe and the outer peripheral surface of the resin layer of the cable are not in close contact, so a gap is formed between the inner peripheral surface of the pipe and the outer peripheral surface of the resin layer, forming an air layer May be. Then, the heat generated in the conductive path by energizing the electric wire is transferred to the resin layer, and when the surface temperature rises, it is blocked by air with low thermal conductivity, making it difficult to transfer to the pipe, and heat is trapped in the pipe. There is a concern that the temperature will rise.

  According to the eighth aspect of the present invention, the heat generated in the conductive line by energizing the electric wire is transmitted to the resin layer and then transmitted to the pipe through the bushing in contact with the resin layer. To be dissipated. Thereby, also in the straight pipe | tube area | region of a pipe, since heat is transmitted via a bushing between a resin layer and a pipe, the thermal conductivity from an electric wire to a pipe can be improved.

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS. The conductor 10 of this 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 (not shown), for example. A cable 13 having three insulated wires (corresponding to a conductive line of the present invention) 11 held by a resin layer 12 and a pipe having a collective shield function and a wire protection function by surrounding the outer peripheral surface of the cable 13 14.

  The pipe 14 has a substantially cylindrical shape made of metal (for example, aluminum alloy, copper alloy, stainless steel, etc.), and is made of a material having a higher thermal conductivity than air.

  As shown in FIG. 4, the pipe 14 is formed by inserting a band-shaped metal plate 15 through a through hole 17 formed in a die 16. The width dimension of the metal plate 15 is set to be larger than the peripheral length of the outer peripheral surface of the cable 13.

  The above-described through-hole 17 is formed so that the inner diameter of the inlet side 19 is larger than the inner diameter of the outlet side 18. The inner diameter of the outlet side 18 is set to be larger than the outer diameter of the cable 13 and is set to be equal to or slightly larger than the outer diameter of the pipe 14. On the other hand, the inner diameter of the entry side 19 is set to be equal to or slightly larger than the width dimension of the metal plate 15. In the state where the cable 13 and the metal plate 15 are overlapped in the through hole 17, the metal plate 15 follows the shape of the through hole 17 by being inserted from the entry side 19 and pulled out from the exit side 18. It is formed in the cylinder shape where the width direction both ends were attached. The cable 13 is inserted into the cylindrical metal plate 15 in this way. Thereafter, the pipes 14 are formed by welding the joining portions 20 at both ends in the width direction of the metal plate 15. The outer diameter of the cable 13 is set to be smaller than the inner diameter of the pipe 14, and a gap is formed between the outer peripheral surface of the cable 13 and the inner peripheral surface of the pipe 14. This prevents the outer peripheral surface of the cable 13 from being deteriorated or melted by heat during welding.

  As described above, the cable 13 is inserted into the pipe 14. The insulated wire 11 constituting the cable 13 is a non-shielded type in which the outer peripheral surface of a core wire 21 made of metal (for example, aluminum alloy or copper alloy) is surrounded by an insulating resin layer 22 made of synthetic resin. Has been. The core wire 21 is formed by twisting a plurality of thin wires 23 into a spiral shape. About the cross-sectional shape of the insulated wire 11, both the core wire 21 and the insulating resin layer 22 are made into a perfect circle. Further, as a material for the insulating resin layer 22, polypropylene, polyethylene, or the like is used.

  The resin layer 12 surrounding the outer peripheral surface of the insulated wire 11 is formed in a form that collectively covers the three insulated wires 11 as will be described later. Is substantially circular. Moreover, as a material of the resin layer 12, as long as it is a synthetic resin whose heat conductivity is higher than air, the same kind as the insulating resin layer 22 of the insulated wire 11 may be used, and the insulating resin layer 22 may be used. Different types may be used.

  As shown in FIG. 2, the three insulated wires 11 are resin-bound on the outer peripheral surface in a state of being bundled so as to form a generally stacked shape (form that draws a substantially regular triangle when the centers of the insulated wires 11 are tied). It is covered by the layer 12 and is thus held in the above arrangement. There is no gap between the outer peripheral surface of the insulating resin layer 22 of the insulated wire 11 and the resin layer 12, and a synthetic resin material constituting the resin layer 12 is also filled in the central space surrounded by the three insulated wires 11. Has been. Further, as schematically shown in FIG. 1, the three insulated wires 11 are twisted at a predetermined pitch. The insulated wire 11 passes through the resin layer 12 without being exposed on the outer peripheral surface of the resin layer 12.

  As shown in FIG. 1, the pipe 14 has a predetermined length at both ends, and the pipe 14 is recessed inward in the thickness direction so that a spiral groove is formed at a constant pitch between the outer periphery and the inner periphery. 24 is formed. Accordingly, the pipe 14 is formed with the spiral groove pipe portion 32 in which the spiral groove 24 is formed in the region excluding both ends thereof, and the straight pipe region in which the spiral groove 24 is not formed at both ends of the pipe 14. 33 is formed. Of the inner peripheral surface of the pipe 14, the region where the spiral groove 24 is formed is in close contact with the outer peripheral surface of the resin layer 12 constituting the cable 13. More specifically, first, in the portion of the pipe 14 that is dented inward in the thickness direction, the inner peripheral surface of the pipe 14 is in a state of being bitten into the outer peripheral surface of the resin layer 12 of the cable 13. . Then, the meat pressed against the inner peripheral surface of the pipe 14 in the resin layer 12 escapes into the gap formed between the undented portion of the pipe 14 and the resin layer 12, and the resin layer 12 is connected to the cable. 13 swells outward in the axial direction. Then, the portion of the pipe 14 that has not been dented and the bulged portion of the resin layer 12 are brought into close contact with each other. As a result, in the spiral groove pipe region, the inner peripheral surface of the pipe 14 and the outer peripheral surface of the resin layer 12 constituting the cable 13 are in close contact with each other.

  The resin layer 12 receives a pressing force inward in the axial direction of the cable 13 by a portion of the inner peripheral surface of the pipe 14 where the spiral groove 24 is formed and is dented. This pressing force is absorbed by the resin layer 12 and the insulating resin layer 22 so as not to reach the core wire 21 of the insulated wire 11.

  Now, an insulating synthetic resin bushing 34 is fitted to the end of the straight pipe region 33 of the pipe 14. The bushing 34 has a substantially annular shape, and the annular portion is externally fitted to the cable 13. In addition, a fitting groove 35 that accommodates the end of the straight pipe region 33 of the pipe 14 is formed on the front side in the fitting direction of the bushing 34 to the pipe 14. In the straight pipe region 33 of the pipe 14, a gap is formed between the inner peripheral surface of the pipe 14 and the outer peripheral surface of the resin layer 12 of the cable. The bushing 34 is fitted in this gap, and the inner peripheral surface of the annular portion of the bushing 34 is in contact with the outer peripheral surface of the resin layer 12. The bushing 34 is also in contact with the inner peripheral surface of the pipe 14. Both ends of the cable 13 are configured to protrude rearward in the fitting direction of the bushing 34, and further, both ends of the insulated wire 11 are configured to protrude from the resin layer 12 of the cable 13.

(Cable forming process)
Then, the manufacturing process of the conductor 10 is demonstrated. First, the three insulated wires 11 that have not been subjected to terminal treatment are bundled in a stack and set in a mold (not shown). The mold is for extruding the resin layer 12 and has a flow path of the resin material in a fluidized state, and an extrusion having the same shape as the cross-sectional shape of the cable 13 and communicating the flow path to the outside of the mold. With mouth. The three insulated wires 11 are accommodated in the flow path with their end portions facing the extrusion ports. From the extrusion port, the three insulated wires 11 are twisted at a predetermined pitch, and the resin layer 12 is extruded while being molded so as to surround the three insulated wires 11 together. That is, the three insulated wires 11 are led out of the mold from the extrusion port together with the resin layer 12. Thus, the cable 13 in which the periphery of the three insulated wires 11 is collectively covered with the resin layer 12 is obtained. The obtained cable 13 is stored, for example, in a form wound on the winding shaft 25A.

(Cable insertion process)
Thereafter, as shown in FIG. 3, the cable 13 is sent out from the take-up shaft 25 </ b> A, and the plate-like metal plate 15 is sent out from the other take-up shaft 25 </ b> B, and the metal plate 15 and the cable 13 are overlapped, It inserts into the through-hole 17 of the die | dye 16 from the entrance side 19 (refer FIG. 4). Then, as shown in FIGS. 5 to 7, both end portions in the width direction of the metal plate 15 abut against the inner peripheral surface of the through hole 17 and are pressed against the inner peripheral surface of the through hole 17. It is bent to follow the shape of the surface. As a result, both end portions in the width direction of the metal plate 15 are brought into contact with each other, and are formed in a cylindrical shape surrounding the cable 13. Then, from the outlet side 18 of the through hole 17, the cable 13 and the metal plate 15 formed in a cylindrical shape in a state of surrounding the cable 13 are led out.

  Subsequently, in a state where both end portions in the width direction are attached together, the attachment portion 20 is welded by a known means (for example, TIG welding, ultrasonic welding, etc.). Thereby, the pipe 14 with the cable 13 inserted therein is formed (see FIGS. 7 and 8).

(Spiral groove machining process)
In a state where the cable 13 is inserted into the pipe 14, the pipe 14 is partially pressed into a groove shape at a constant pitch while circulating around the outer periphery of the pipe 14 by a known method, thereby forming the spiral groove 24. A spiral groove pipe portion 32 in which the pipe 14 is in close contact with the resin layer 12 on the inner peripheral side of the spiral groove 24 is intermittently formed across a straight pipe region 33 where the spiral groove 24 is not formed (see FIG. 9).

(First pipe cutting process)
After the spiral groove pipe portion 32 and the straight pipe region 33 are formed, the pipe 14, the resin layer 12, and the insulated wire 11 are cut in the straight pipe region 33 by a known means (for example, a rotary saw) (see FIG. 10). Thereby, the pipe 14 and the cable 13 are cut | disconnected in the state in which a part of straight pipe | tube area | region 33 is located in the both sides of the spiral groove pipe part 32. FIG.

(Second pipe cutting process)
Next, as shown in FIG. 11, in the straight pipe region 33 of the pipe 14, the pipe 14 having a predetermined length from the end is cut with a pipe cutter (not shown) to expose the resin layer 12 of the cable 13. .

  When the pipe 14 is cut by the pipe cutter, a burr (not shown) is generated on the inner surface of the pipe 14. In view of this point, in the present embodiment, a gap is formed between the inner peripheral surface of the pipe 14 and the outer peripheral surface of the cable 13 in the straight pipe region 33 of the pipe 14. Thus, the resin layer 12 of the cable 13 can be prevented from being damaged. The burrs are removed by inserting a file or a tool for removing burrs into the gap between the inner peripheral surface of the pipe 14 and the outer peripheral surface of the cable 13 and scraping the end portion of the straight pipe region 33.

(Bushing fitting process)
After removing the burrs, a bushing 34 is externally fitted to the end of the cable 13, the bushing 34 is moved to the pipe 14 side, and then the end of the straight pipe region 33 cut by the pipe cutter is fitted to the bushing 34. The bushing 34 is fitted to the end portion of the straight pipe region 33 so as to be accommodated in the joint groove 35. In a state in which the bushing 34 is fitted to the pipe 14, both end portions of the cable 13 are exposed from the bushing 34 so as to protrude rearward in the fitting direction.

  A slit (not shown) is formed in the exposed resin layer 12 of the cable 13 with a cutter (not shown), and the resin layer 12 is peeled off from the insulated wire 11 to expose the end of the insulated wire 11. Subsequently, a slit (not shown) is formed in the insulating resin layer 22 of the exposed insulated wire 11 with a cutter (not shown), and a terminal process is performed to remove the insulating resin layer 22 and expose the core wire 21. Thus, the manufacture of the conductor 10 of this embodiment is completed.

  Then, the effect | action and effect of this embodiment are demonstrated. If the pipe 14 is cut in the second pipe cutting step, burrs or burrs may occur. If the conductor is used with burrs and burrs remaining, there is a concern that the burrs and burrs may bite into the resin layer due to vibration and the like, and the insulation of the cable will be lowered.

  In view of the above points, in the present embodiment, the bushing 34 is fitted to the cut end portion of the straight pipe region 33 of the pipe 14. Thereby, even if burrs or burrs are generated, the cut end portion of the straight pipe region 33 is covered by the bushing 34, so that the resin layer 12 of the cable 13 can be prevented from being damaged. As a result, it is possible to prevent the insulation of the cable 13 from being lowered. Thus, according to this embodiment, the processing of the pipe 14 can be easily performed by a simple operation of fitting the bushing 34.

  Further, when the end portion of the straight pipe region 33 of the pipe 14 is exposed, the end portion of the straight pipe region 33 comes into contact with the resin layer 12 of the cable 14 due to vibration or the like. There is concern that it will be hurt. In view of this point, in the present embodiment, since the end of the straight pipe region 33 of the pipe 14 is covered with the bushing 34, the end of the straight pipe region 33 contacts the resin layer 12 of the cable 13 due to vibration or the like. Thus, the resin layer 12 can be prevented from being damaged.

  Since the end portion of the straight pipe region 33 of the pipe 14 is accommodated in the fitting groove 35 so as not to be exposed to the outside, even if burrs or burrs remain, the worker can Can prevent injury from burrs.

  In addition, as a result of being able to increase the creeping distance between the pipe 14 and the core wire 21 of the cable 13 by fitting an insulating bushing 34 to the end of the straight pipe region 33 of the pipe 14, The insulation between the pipe 14 and the cable 13 can be improved.

  Further, when the pipe 14 is cut with a pipe cutter, burrs are generated on the inner surface side of the pipe 14. For this reason, for example, in a conductor in which the inner peripheral surface of the pipe 14 and the outer peripheral surface of the cable 13 are in contact, the resin layer 12 of the cable 13 may be damaged by burrs generated on the inner surface side of the pipe 14. Therefore, a pipe cutter cannot be used.

  In view of this point, in the present embodiment, since a gap is formed between the outer peripheral surface of the cable 13 and the inner peripheral surface of the pipe 14 in the straight pipe region 33, the resin layer 12 of the cable 13 is damaged by burrs. This can be prevented, and a pipe cutter can be used to cut the pipe 14. As a result, the efficiency of pipe cutting work can be improved.

  Further, the burr generated on the inner surface side of the pipe 14 may be removed by inserting, for example, a file or a tool for removing burrs into the gap between the outer peripheral surface of the cable 13 and the inner peripheral surface of the pipe 14. Burrs and burrs can be easily removed without damaging the resin layer 12 of the cable 13. Even if burrs and burrs remain without being removed, the bushing 34 is fitted to the cut end of the straight pipe portion as described above, so that the resin layer 12 of the cable 13 is also prevented from being damaged. it can.

  Moreover, the conductor 10 of this embodiment provides the spiral groove 24 by denting the outer periphery and inner periphery of the pipe 14 in the thickness direction inside, and the part of the pipe 14 where the spiral groove 24 is formed is provided. Since the inner peripheral surface and the outer peripheral surface of the resin layer 12 are in close contact with each other, the heat generated in the core wire 21 during energization is transferred to the insulating resin layer 22 and the resin layer 12, and then the outer peripheral surface of the resin layer 12. Then, the heat is transmitted directly to the inner peripheral surface of the pipe 14 and the thermal conductivity from the core wire 21 to the pipe 14 is improved. Thereby, the conductor 10 of this embodiment is excellent in the performance which discharge | releases the heat | fever which generate | occur | produced in the core wire 21 compared with what the air layer existed between the resin layer 12 and the pipe 14. FIG.

  And since the resin layer 12 is shape | molded in the form which surrounds the outer periphery of the insulated wire 11 collectively, the outer periphery of the insulated resin layer 22 of the insulated wire 11 can be closely_contact | adhered with respect to the resin layer 12 without a gap. . Thereby, the thermal conductivity from the insulated wire 11 to the resin layer 12 can be improved.

  Furthermore, since the spiral groove 24 is formed in the pipe 14, the surface area of the outer peripheral surface of the pipe 14 can be increased, so that the heat dissipation from the pipe 14 to the surrounding air can be improved.

  As described above, since the heat dissipation is improved, it can be expected that the conductor 10 is reduced in weight. That is, when a predetermined current is passed through the core wire 21, the smaller the cross-sectional area of the core wire 21, the greater the amount of heat generated by the core wire 21. However, if the heat dissipation is excellent as in this embodiment, the core wire 21. Even if the calorific value is large, the temperature rise of the cable 13 (comprising the core wire 21, the insulating resin layer 22, and the resin layer 12) can be suppressed low. Therefore, in an environment where an upper limit is set for the temperature rise value of the cable 13 as in an electric vehicle, the cable 13 can be obtained by changing the conventional conductor 10 to the conductor 10 of the present embodiment having excellent heat dissipation. The allowable amount of heat generation at is relatively large. And that the heat generation allowable amount in the cable 13 becomes relatively large means that the minimum cross-sectional area of the core wire 21 that can be used in an environment where an upper limit is set for the temperature rise value of the cable 13 can be reduced. By reducing the cross-sectional area of the core wire 21, the conductor 10 can be reduced in weight and diameter.

  Further, in the straight pipe region 33 of the pipe 14, the inner surface of the pipe 14 and the outer peripheral surface of the resin layer 12 of the cable 13 are not in close contact with each other, and therefore, between the inner peripheral surface of the pipe 14 and the outer peripheral surface of the resin layer 12. In some cases, an air layer is formed due to a gap. Then, the heat generated in the core wire 21 during energization is transmitted from the insulating resin layer 22 to the resin layer 12 and when the surface temperature rises, the heat is interrupted by air having low thermal conductivity and becomes difficult to be transmitted to the pipe 14. There is concern that the temperature will rise due to heat accumulation.

  In view of the above points, in the present embodiment, the heat generated in the core wire 21 is transmitted from the insulating resin layer 22 to the resin layer 12, and then transmitted to the pipe 14 through the bushing 34 in contact with the resin layer 12. 14 to ambient air. Thereby, also in the straight pipe | tube area | region 33 of the pipe 14, since heat is transmitted between the resin layer 12 and the pipe 14 via the bushing 34, the thermal conductivity from the core wire 21 to the pipe 14 is improved. Can do.

  Further, the inner peripheral surface of the portion of the pipe 14 where the spiral groove 24 is formed bites into the outer peripheral surface of the resin layer 12, so that a pressing force acts on the resin layer 12 from the inner peripheral surface of the pipe 14. If this pressing force is transmitted to the core wire 21, the core wire 21 may be deformed or possibly broken. In view of this point, in the present embodiment, since the pressing force is absorbed by the resin layer 12 and the insulating resin layer 22, it is possible to prevent the core wire 21 from being deformed or disconnected.

  In order to make the cable 13 inserted into the pipe 14, for example, it is conceivable to insert the cable 13 into the pipe 14 formed in a cylindrical shape in advance. However, according to this method, there is a concern that the end of the cable 13 may be caught on the inner peripheral surface of the pipe 14. In view of the above points, in the present embodiment, after the band-shaped metal plate 15 and the cable 13 are inserted into the through hole 17 formed in the die 16, the pipes are welded at both ends. The cable 13 is inserted into the cable 14. Thereby, when the pipe 14 is formed, the cable 13 is already inserted into the pipe 14. As a result, it is possible to improve the efficiency of work for setting the cable 13 in the pipe 14.

  Further, in the present embodiment, the spiral groove 24 is formed on the outer peripheral surface and the inner peripheral surface of the pipe 14, so that the inner peripheral surface of the pipe 14 bites into and adheres to the outer peripheral surface of the resin layer 12 of the cable 13. It has become. As a result, the heat generated in the insulated wire 11 during energization is efficiently transferred to the pipe 14 directly from the resin layer 12 of the cable 13. For this reason, since it is not necessary to dent the pipe 14 in the thickness direction inward over the entire surface, the work of bringing the inner peripheral surface of the pipe 14 into close contact with the outer peripheral surface of the resin layer 12 is simplified. it can.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIG. In the present embodiment, the conductor 10 is manufactured as follows.

(Cable insertion process)
A cable 14 that has been cut in advance to a length longer than the length of the pipe 14 is inserted into the pipe 14 that has been cut in advance to a predetermined length.

(Spiral groove machining process)
In a state where the cable 13 is inserted into the pipe 14, the pipe 14 is partially grooved at a constant pitch while circulating around the outer periphery of the pipe 14 by leaving a predetermined length portion at both ends of the pipe 14 by a known method. By forming the spiral groove 24 by pressing in the shape, the spiral groove pipe portion 32 in which the pipe 14 is brought into close contact with the resin layer 12 is formed on the inner peripheral side of the spiral groove 24, and predetermined ends of both ends of the pipe 14 are formed. A straight pipe region 33 in which the spiral groove 24 is not formed is formed in the length portion.

(Bushing fitting process)
After that, the bushing 34 is externally fitted to the end of the cable 13, the bushing 34 is moved to the pipe 14 side, and then the end of the straight pipe region 33 is accommodated in the fitting groove 35 of the bushing 34. The bushing 34 is fitted to the end of the straight pipe region 33.

  Since the configuration other than the above is substantially the same as that of the first embodiment, the same portions are denoted by the same reference numerals, and redundant description is omitted.

  According to this embodiment, even if burrs or burrs remain at the end of the straight pipe region 33 of the pipe 14, the end of the straight pipe region 33 is covered by the bushing 34. It is possible to prevent the resin layer 12 from being damaged.

  Further, even when burrs and burrs are not left at the end of the straight pipe region 33, it is possible to prevent the end of the straight pipe region 33 from biting into the resin layer 12 of the cable 13 due to vibration or the like.

<Embodiment 3>
Subsequently, Embodiment 3 of the present invention will be described with reference to FIG. The conductor 10 according to the present embodiment includes a cable 13 having a resin layer 12 around a conductive line 31 and a pipe 14 having both a collective shield function and an electric wire protection function by surrounding the outer peripheral surface of the cable 13. And is configured.

  The cable 13 is formed by covering the outer peripheral surface of a conductive line 31 formed by twisting thin wires 23 made of metal (for example, aluminum alloy or copper alloy) with a resin layer 12 made of synthetic resin.

  In the pipe 14, spiral grooves 24 are formed at a constant pitch between the outer periphery and the inner periphery by leaving the pipe 14 inward in the thickness direction while leaving a predetermined length at both ends. Accordingly, the pipe 14 is formed with the spiral groove pipe portion 32 in which the spiral groove 24 is formed in the region excluding both ends thereof, and the straight pipe region in which the spiral groove 24 is not formed at both ends of the pipe 14. 33 is formed. Of the inner peripheral surface of the pipe 14, the region where the spiral groove 24 is formed is in close contact with the outer peripheral surface of the resin layer 12 constituting the cable 13. More specifically, first, in the portion of the pipe 14 that is dented inward in the thickness direction, the inner peripheral surface of the pipe 14 is in a state of being bitten into the outer peripheral surface of the resin layer 12 of the cable 13. . Then, the meat pressed against the inner peripheral surface of the pipe 14 in the resin layer 12 escapes into the gap formed between the undented portion of the pipe 14 and the resin layer 12, and the resin layer 12 is connected to the cable. 13 swells outward in the axial direction. Then, the portion of the pipe 14 that has not been dented and the bulged portion of the resin layer 12 are brought into close contact with each other. As a result, in the spiral groove pipe region, the inner peripheral surface of the pipe 14 and the outer peripheral surface of the resin layer 12 constituting the cable 13 are in close contact with each other.

  When the inner peripheral surface of the pipe 14 is digged into the resin layer 12 of the cable 13 as described above, a pressing force acts on the resin layer 12 from the inner peripheral surface of the pipe 14, and the conductive line 31 is pressed by this pressing force, There is a concern that the conductive line 31 may be deformed or disconnected in some cases. In view of the above points, in the present embodiment, the resin layer 12 is set to a thickness dimension that absorbs the pressing force from the inner peripheral surface of the pipe 14 and does not act on the conductive line 31. . In addition, the thickness dimension of the resin layer 12 is set to a thickness that can insulate the conductive line 31 even when the resin layer 12 is depressed by being pressed against the inner peripheral surface of the pipe 14.

  In addition, since it is substantially the same as that of Embodiment 1 about the structure other than the above, the same code | symbol is attached | subjected about the same part and the overlapping description is abbreviate | omitted.

  Then, the manufacturing process of the conductor 10 is demonstrated. First, the one cable 13 not subjected to the terminal treatment is sent out from the take-up shaft 25, and the plate-shaped metal plate 15 is sent out from the take-up shaft 25, and the metal plate 15 and the cable 13 are overlapped. The die 16 is inserted into the through hole 17 from the entry side 19. Then, both ends in the width direction of the metal plate 15 abut against the inner peripheral surface of the through hole 17 and are pressed against the inner peripheral surface of the through hole 17, and are bent according to the shape of the inner peripheral surface of the through hole 17. . As a result, both end portions in the width direction of the metal plate 15 are brought into contact with each other, and are formed in a cylindrical shape surrounding the cable 13. Then, from the outlet side 18 of the through hole 17, the cable 13 and the metal plate 15 formed in a cylindrical shape in a state of surrounding the cable 13 are led out.

  Subsequently, in a state where both end portions in the width direction are attached together, the attachment portion 20 is welded by a known means (for example, TIG welding, ultrasonic welding, etc.). Thereby, the pipe 14 with the cable 13 inserted therein is formed.

  Since the manufacturing method other than the above is substantially the same as that of the first embodiment, the overlapping description is omitted.

  The conductor 10 including one cable 13 as in the third embodiment can be suitably used for, for example, an application in which a direct current is supplied by connecting a not-shown inverter and a battery.

<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 first embodiment, the number of insulated wires 11 inserted through one pipe 14 is three. However, the number is not limited to this, and the number of insulated wires 11 inserted through the pipe 14 is two or Four or more may be sufficient.

  (2) In Embodiment 1, the insulated wires 11 are arranged in a stacked manner in the resin layer 12, but the invention is not limited to this, and the insulated wires 11 may be arranged in a line, They may be arranged vertically and horizontally.

  (3) In the first embodiment, the same type of three insulated wires 11 are inserted into one pipe 14, but the present invention is not limited to this. For example, the insulated wire 11 for power and the signal The insulated electric wire 11 may be inserted into one pipe 14.

  (4) In the second embodiment, the conductor 10 is inserted into the pipe 14 that has been cut to a predetermined length in advance through the cable 13 longer than the pipe 14, leaving both ends of the pipe 14. Is formed in the thickness direction inward to form a spiral groove pipe portion 32 in which a spiral groove 24 is formed, and both ends of the pipe 14 are defined as a straight tube region 33, and at the end of the straight tube region 33. Although the bushing 34 is fitted, the present invention is not limited to this, and the spiral groove pipe portion 32 is formed by denting the pipe 14 inward in the thickness direction while leaving one end portion of the pipe 14. One end of 14 may be a straight pipe region 33, and a bushing 34 may be fitted to the end of the straight pipe region 33.

  (5) In this embodiment, the bushing 34 is in contact with the outer peripheral surface of the resin layer 12, but the bushing 34 and the resin layer 12 may not be in contact.

  (6) In the present embodiment, the cross-sectional shape of the pipe 14 is substantially circular, but the present invention is not limited to this, and the cross-sectional shape of the pipe 14 is non-circular (for example, an oval, an ellipse, a trapezoid or a triangle including a triangle). Etc.).

  (7) In the present embodiment, the spiral grooves 24 are formed on the outer peripheral surface and the inner peripheral surface of the pipe 14 at a constant pitch. However, the present invention is not limited to this, and the pitch of the spiral grooves 24 may not be constant.

  (8) Although the insulated wire 11 and the conductive line 31 are stranded wires, the present invention is not limited to this, and the insulated wire 11 and the conductive line 31 may be single-core wires.

  (9) In the present embodiment, the spiral groove pipe portion 32 has no gap between the resin layer 12 and the pipe 14. However, the present invention is not limited to this, and at least a part of the inner peripheral surface of the pipe 14 is a resin layer. 12 may be present between the resin layer 12 and the pipe 14 as long as it is in close contact with the outer peripheral surface of the resin 12.

  (10) Although the present embodiment has been described as a configuration in which the braided wire is not attached to the end of the pipe 14, the present invention is not limited thereto, and the braided wire may be attached to the end of the straight pipe region 33 of the pipe 14. In this case, since the straight pipe region 33 has a cylindrical shape, the braided wire can be easily attached to the end of the pipe 14 as compared with, for example, the case where the spiral groove 24 is formed up to the end of the pipe 14. . As a result, the shielding effect of the cable 13 extending from both ends of the pipe 14 can be easily maintained.

1 is a partially cutaway longitudinal sectional view of a conductor according to Embodiment 1. FIG. AA line sectional view in FIG. The figure which explains the outline of the manufacturing process of a conductor, and shows a cable, a metal plate, and a die Partially enlarged sectional view showing a state in which the cable and the metal plate are inserted through the through hole of the die Cross section of cable and metal plate showing the state before the outer peripheral surface of the cable is surrounded by the metal plate Cross-sectional view of cable and metal plate showing a state where the outer peripheral surface of the cable is surrounded by the metal plate Cross-sectional view of cable and metal plate showing the outer periphery of the cable surrounded by the metal plate Partially cutaway longitudinal sectional view showing a state in which the outer peripheral surface of the cable is surrounded by a metal plate Partially cutaway longitudinal sectional view showing a state in which a spiral groove pipe portion is formed in the pipe Partially cutaway longitudinal sectional view showing a state in which the first pipe cutting process is completed Partially cutaway longitudinal sectional view showing a state before the bushing is fitted after the second pipe cutting step is completed The conductor which concerns on Embodiment 2 WHEREIN: The partially notched longitudinal cross-sectional view which shows the state which penetrated the cable to the pipe Cross-sectional view of a conductor according to Embodiment 3 of the present invention

Explanation of symbols

10: Conductor 11 ... Insulated wire (conductive line)
12 ... Resin layer 13 ... Cable 14 ... Pipe 21 ... Core wire (conductive line)
22 ... Insulating resin layer 24 ... Spiral groove 31 ... Conductive line 32 ... Spiral groove pipe part 33 ... Straight pipe region 34 ... Bushing

Claims (8)

A cable insertion step of inserting a cable having a resin layer on the outer periphery of the conductive line into a metal pipe; and
A spiral groove pipe portion in which the pipe is brought into close contact with the resin layer on the inner peripheral side of the spiral groove by forming a spiral groove by partially pressing the pipe while going around the outer periphery of the pipe. A spiral groove processing step that is intermittently formed across a straight pipe region that does not form
A first pipe cutting step in which a part of the straight pipe region is located on both sides of the spiral groove pipe portion by cutting the pipe together with the cable in the straight pipe region;
A second pipe cutting step for exposing the end of the cable by cutting off the pipe of a predetermined length from the end of the cut straight pipe region;
And a bushing fitting process for fitting a bushing covering the cut end of the pipe to the pipe. The conductive line is an insulated wire in which an insulating resin layer is provided on an outer periphery of a core wire, and prior to the cable insertion step, a plurality of the insulated wires are bundled and a cable forming step is performed to cover the resin layer collectively. Item 2. A method for producing a conductor according to Item 1. The conductor production according to claim 1 or 2, wherein in the cable insertion step, an outer diameter of the cable is set so that a gap is formed between an outer peripheral surface of the cable and an inner peripheral surface of the pipe. Method. In the cable insertion step, a pipe into which the cable is inserted is formed by surrounding the outer periphery of the cable while bending the metal plate along the outer peripheral surface of the cable and welding the edges of the metal plate. The manufacturing method of the conductor in any one of Claim 1 thru | or 3. A cable provided with a resin layer on the outer periphery of the conductive line;
A metal pipe surrounding the outer peripheral surface of the cable;
An inner circumference of the spiral groove is formed by leaving a predetermined length portion from at least one end of the pipe and forming a spiral groove by partially pressing the pipe around the outer circumference of the pipe. A spiral groove pipe portion in which the pipe is in close contact with the resin layer on the side;
A straight pipe region that is left in a predetermined length portion from at least one end of the pipe, and the spiral groove pipe portion is not formed;
A conductor comprising a bushing fitted to cover an end of the straight pipe region of the pipe. The conductive line is an insulated wire provided with an insulating resin layer on the outer periphery of the core wire,
The conductor according to claim 5, wherein the cable is bundled with a plurality of the insulated wires and collectively covered with the resin layer. The conductor according to claim 5 or 6, wherein an outer diameter of the cable is set so that a gap is formed between an outer peripheral surface of the cable and an inner peripheral surface of the pipe. The conductor according to any one of claims 5 to 7, wherein the bushing is in contact with both an inner peripheral surface of the pipe and an outer peripheral surface of the resin layer in a straight pipe region of the pipe.

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