JP2019087524A - Multicore type insulating electric wire and method for manufacturing the same - Google Patents

Abstract

To provide a multicore type insulating electric wire which enables high density arrangement of a plurality of conductive wires 13 and contributes to reduction in the number of molding steps and improvement in productivity while securing shape retention of the conductive wires 13, and a method for manufacturing the same.SOLUTION: An insulating core axis 40 forming a core axis structure has a solid shape, and a form including a plurality of crest parts 40a and a plurality of trough parts 40b is produced and prepared (initial step). Arrangement, filling and deformation steps include filling a space part Sp generated between the through parts 40a and conductive wires 13 with a resin body 14. At the same time, an insulating wire body 42 is provided which includes a crest part modification part 42a where the crest part 40b is deformed to the side in a circumferential direction of the core axis 40 to cover both the conductive wires 13 and the resin body 14. Shape retention can be secured such that the whole is tightly bundled and collected while securing the whole flexibility.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a multicore insulated wire applied to an electric system such as a vehicle, and more particularly to a multi-functional multicore insulated wire in which a plurality of conductive wires are disposed in an insulating state by a simple manufacturing method and a manufacturing method thereof.

For example, in the automobile manufacturing industry, various electric wires are used as wire harnesses for connection in order to supply electric power to electrical components. In this type of electric wire, there are some in which a plurality of conductive wires are disposed in an insulating state and extrusion-coated in order to exhibit multifunctionality (see Patent Document 1).
This patent document 1 discloses a manufacturing method and a manufacturing apparatus of a multifilamentary flat electric wire as a specific invention, and achieves an extrusion coating structure for preventing twisting of the flat conductor in the crosshead when coating the flat conductor. ing.

In the multicore cable disclosed in Patent Document 2, among a plurality of coaxial wires, two or more coaxial wire pairs are arranged in parallel in a contact state, and crosstalk between coaxial wires is suppressed to -40 dB or less .
Patent Document 3 discloses a multicore cable in which a plurality of electric wires are covered with a jacket, and a thick portion in which the coating thickness of the jacket at both ends is larger than the coating thickness of the middle portion is formed. Thus, when connecting the multi-core cable to the connector, the thick portion functions as a strain relief to protect the connection portion.

  In the multi-core cable of Patent Document 4, a coaxial wire unit, a plurality of coaxial wires, a resin tape, a shielding layer, and a resin outer jacket are concentrically arranged with respect to a central layer made of tensile strength fibers. This laminated structure ensures high flexibility while securing heat resistance and voltage resistance.

  In the insulated wire of patent document 5, the insulation coating which considered the mounting property to an apparatus is shape | molded as a laminate by extrusion molding using resin which added magnesium hydroxide to ethylene vinyl acetate resin. The insulation coating realizes a flame-retardant multi-core flat type insulated wire which does not contain a halogen compound by being crosslinked by γ-ray irradiation in a later step.

Unexamined-Japanese-Patent No. 9-213149 JP, 2016-207658, A JP, 2016-81672, A JP, 2006-56706, A Japanese Patent Application Laid-Open No. 2002-260452

However, in any case of Patent Documents 1-5, the conductor wire needs to be resin-coated and then molded in a state of being embedded in the insulator.
For this reason, it becomes difficult to arrange conductor wires at a high density, and there is also a possibility that productivity will decrease due to the time required for forming a large number of molding operations.

  The present invention has been made in view of the above circumstances, and an object thereof is to arrange a plurality of conductive wires at a high density, and to reduce the number of molding steps, thereby completing the molding operation in a short time and productivity. It is an object of the present invention to provide a multi-core type insulated wire which contributes to the improvement of

(Regarding claim 1 and claim 2)
The insulating core shaft has a form formed along the axial direction as a core shaft structure, and the outer peripheral edge portion of the core shaft has a plurality of peak portions and a plurality of valley portions which are undulated along the circumferential direction. It is provided continuously.
A plurality of conductive wires are provided in each of the valleys as a whole. A resin body is filled and disposed in a gap formed between the valley and the conductive wire. A peak deformation portion is provided which covers both the conductive wire and the resin body by lateral deformation of the peak. An outer cover layer is provided which covers the core shaft together with the conductive wire, the resin body, and the three parts of the peak portion deformation portion.

In the first and second aspects of the present invention, since the plurality of conductive lines are provided in each valley portion, high density arrangement of the conductive line group is possible. Since the peak deformation portion covers both the conductive wire and the resin body by lateral deformation, the conductive wire and the resin body are integrated and firmly fixed.
In addition, since the conductive wire group of the core shaft is covered with the resin body by the outer covering layer, the shape retention property in which the conductive wire group and the resin body are tightly bundled and collected while securing the entire flexibility. Can be secured.
Furthermore, since the conductive wires of the first conductive wire, the second conductive wire and the third conductive wire do not need to be covered and may be in the form of bare wires, the molding operation is completed in a short time by reducing the number of molding steps. It can contribute to the improvement of productivity.

(Regarding Claim 3 and Claim 6)
The conductive wire is formed of a stranded wire formed by twisting a plurality of thin wires.

  In claims 3 and 6, high electrical capacity can be realized, and high flexibility rich in bending displacement can be obtained.

(Regarding Claim 4 and Claim 7)
The outer covering layer and the resin body are formed of the same kind of synthetic resin material in order to eliminate migration between them.

  In the fourth and seventh aspects of the present invention, since there is no migration, even if the outer covering layer and the resin body are in close contact with each other, the attachment such as a plasticizer does not move between the two. . As a result, the outer covering layer and the resin body do not peel off, and it is possible to maintain good adhesion retention between them for a long time.

(Regarding Claim 5 and Claim 8)
All of the core shaft, the cover layer and the resin body are formed of a flame retardant polyurethane resin.

  For this reason, it is possible to mold these three components cost-effectively by using a common synthetic resin material.

(A) is a longitudinal cross-sectional view showing a first extrusion molding machine in which the first conductive wire and the second conductive wire are provided on the core shaft, (b) is a cross-sectional view taken along the N1-N1 line of (a), (c) Is a cross-sectional view taken along the N2-N2 line of (a) (Example 1). (D) is a longitudinal cross-sectional view which shows the 2nd extrusion molding machine which provides a 3rd conductive wire in a core axis, (e) is a cross-sectional view which follows N3-N3 line of (d) (Example 1). (A) is a longitudinal cross-sectional view which shows the 3rd extrusion molding machine which provides an outer covering layer, (b) is a cross-sectional view which follows the J1-J1 line of (a) (Example 1). (A)-(c) is a cross-sectional view which shows the procedure which shape | molds an insulated wire body at the arrangement | positioning process using the coated 3rd conductor wire (Example 2). It is a perspective view which shows the shaping | molding nozzle which provides a 1st conductive wire and a 2nd conductive wire in a core axis (Example 3). (A) is a longitudinal sectional view showing a molding nozzle provided with a first conductive wire and a second conductive wire on a core axis, (b) is a longitudinal sectional view showing a fourth extrusion molding machine provided with an outer cover layer on the outer peripheral side, c) is a cross-sectional view taken along line J2-J2 in FIG. 5, (d) is a cross-sectional view taken along line J3-J3 in (a), (e) is a cross section taken along line J4-J4 in (a) (F) is a cross-sectional view taken along the line J5-J5 of (b) (Example 3). (A)-(c) is a cross-sectional view which shows the formation process of a multicore type insulated wire, (d) is a perspective view which shows the structure of a core axis (Example 4). (A) is a cross-sectional view showing a fifth extruder for extruding the core, (b) is a cross-sectional view taken along line N4-N4 of (a), (c) is N5-N5 of (a) It is a cross-sectional view which follows a line (Example 5). It is a cross-sectional view which shows a multicore type insulated wire (Example 5). (A)-(c) is a cross-sectional view which shows the formation process of a multicore type insulated wire (Example 6).

  In the multicore type insulated wire according to the present invention, a peak portion deformation portion is provided which covers both the conductive wire and the resin body by side deformation of the peak portion. An outer cover layer is provided which covers the core shaft together with the conductive wire, the resin body, and the three parts of the peak deformation portion.

A first embodiment of the present invention will be described based on FIGS. 1 to 3.
In the multicore insulated wire according to the present invention, for example, from a sensor (not shown) for driving electrical components such as ABS (anti-lock and braking system) and EPB (electric parking brake) installed in a car It is useful for signal transmission to an electrical control unit (ECU) as a control computer.
As a power source, for example, a battery assembly (one-cell stack) in which a plurality of thin rectangular batteries are juxtaposed in parallel in the left-right direction as a single secondary battery is used.

The first extruder 1 shown in FIG. 1A is used for molding and manufacturing the multicore insulated wire. The point 2 of the extrusion molding machine 1 is a normal model provided with a molding nozzle 3 for extrusion and a crosshead 4 which form a truncated cone cylindrical shape.
Insulating molten resin S1 (for example, flame retardant polyurethane resin) from a screw cylinder 6 in which a screw 6a for flow promotion is provided in a flow passage 5 formed between the molding nozzle 3 and the cross head 4 Is made to flow and feed toward the mold 7.
The forming nozzle 3 is usually made of metal such as stainless steel (SUS), die steel or tungsten superalloy steel, and the taper angle is set within an angle range of, for example, 30 ° -70 °. The molding nozzle may be made of ceramic instead of metal.

As an example, the mold 7 is formed such that the hollow portion has a substantially cruciform cylindrical shape, and as shown in FIG. 1B, the mold 7 has one first conductive wire 8 and four ones. The molten resin S1 is pressure-passed from the flow passage 5 together with the second conductive wire 9 of FIG.
Thereby, the core shaft 10 after die cutting shown in FIG. 1C is molded and prepared as a core shaft structure of a predetermined length (initial process).
That is, the first conductive wire 8 is disposed to be able to pass through the center of the mold 7, and the second conductive wire 9 is disposed to be able to pass through the inside of the outer peripheral end of the mold 7.

The core shaft 10 processed in the initial step has a central portion 11 a and forms a core shaft structure in a form extending in the axial direction. The uneven portion 10A is unevenly formed on the outer peripheral edge of the core shaft 10 so as to function as a multi-separator of conductive lines.
The relief portion 10A is provided to divide the outer peripheral edge portion of the core shaft 10 into a plurality of sections along the circumferential direction, and a plurality of (for example, four) peak portions 11b are undulated around the outer periphery of the central portion 11a. And a plurality of (for example, four) valleys 11c.
In the disposing step performed simultaneously with the initial step, the first conductive wire 8 is disposed along the axial direction at the central portion of the core shaft 10 simultaneously with the molding of the core shaft 10 accompanying the pressure feed of the molten resin S1 to the mold 7. The second conductive wire 9 is embedded in each of the mountain portions 11 b.

In the disposition / filling step subsequent to the initial step, as shown in FIG. 2D, the third conductive wire 13 is disposed in each of the valleys 11c using the second extruder 12. At the same time, as shown in FIG. 2 (e), the molten resin S2 is injected into the space Sp created between the valley 11c and the third conductive wire 13 to form the resin body 14 (for example, a flame retardant polyurethane resin). Fill with).
At this time, the third conductive wire 13 constitutes a conductive wire group 18 together with the first conductive wire 8 and the second conductive wire 9.

That is, in the disposing and filling process, the molten resin S2 (flame-retardant polyurethane resin) is fluidly pumped in the flow passage 15 between the molding die 12a of the second extrusion molding machine 12 and the crosshead 12b.
At the same time, the core wire 10 and the third conductive wire 13 are both extruded through the point 12c to form the insulated wire body 17 in which the resin body 14 is filled in the space Sp.
At the time of this extrusion molding, the insulated wire body 17 receives a twisting force accompanying the passage of the point 12c, and is deformed so as to twist in a spiral shape within a range where there is no hindrance.

In the coating step subsequent to the disposing and filling step, as shown in FIG. 3A, the third extrusion molding machine 19 is used to coat the conductive wire group 18 of the core shaft 10 together with the resin body 14 A layer 20 (thickness 0.3 mm-0.5 mm) is formed.
That is, in the coating step, the molten resin S3 (flame-retardant polyurethane resin) is flow-pushed through the flow passage 21 between the die 19a of the third extrusion molding machine 19 and the crosshead 19b.
At the same time, the insulated wire body 17 is passed through the points 19c by extrusion, whereby the outer covering layer 20 is coated on the insulated wire body 17 to form the multicore insulated wire 20A (see FIG. 3B). .

  Here, to give an example of the specification (material and dimensional relationship) of the conductive wire group 18, the first conductive wire 8 is a single compressed stranded wire formed by twisting a plurality of thin wires made of a Cu-Sn alloy. The second conductive wire 9 is arranged at four points by means of a compressed stranded wire (37 / 0.08) formed by twisting 37 thin wires (φ 0.08 mm) made of a Cu-Sn alloy (37 / 0.08). Cross section: 0.54 square millimeters).

The third conductive wire 13 consists of four, and two of them are compressed stranded wires (37 / 0.08) formed by twisting 37 thin wires (φ 0.08 mm) made of a Cu-Sn alloy.
For the other two, prepare a compressed twisted wire (37 / 0.08) in which 87 thin wires (φ 0.08 mm) made of Cu-Sn alloy are twisted and prepare another 7 twisted wires. Compressed double stranded wire (7/85 / 0.08). The cross-sectional area of the compressed double stranded wire is 2.47 square millimeters. As the conductive wire group 18, it is also possible to use a wire manufactured by Sanshu Electric Wire Co., Ltd., which is a specialized manufacturer located in Shonan City, Aichi Prefecture, among others.
If the conductive wire group 18 is extended, each of the four second conductive wires 9 may be set to have completely different diameter dimensions from one another, and the four third conductive wires 13 may also have completely different diameters from one another. It may be set to dimensions.
The first conductive wire 8 and all the second conductive wires 9 in the conductive wire group 18 may be omitted when it is judged unnecessary from the practical viewpoints such as the application object and the use condition.

[Effect of Example 1]
In the first embodiment, since the conductive wire group 18 including the first conductive wire 8, the second conductive wire 9 and the third conductive wire 13 is provided at the central portion 11a, the valley portion 11b and the peak portion 11c of the core shaft 10, A high density arrangement of conductive lines 18 is possible.
Further, since the conductive wire group 18 of the core shaft 10 is covered together with the resin body 14 by the outer covering layer 20, the conductive wire group 18 is tightly bundled with the resin body 14 while securing the entire flexibility. Thus, it is possible to secure the shape retention that can be gathered.
Furthermore, since the conductive wires of the first conductive wire 8, the second conductive wire 9 and the third conductive wire 13 do not need to be covered and may be in the form of bare wires, the number of molding steps can be reduced, and the molding operation can be performed in a short time. It can end and contribute to the improvement of productivity.

A plurality of second conductive wires 9 have different diameter dimensions, and a plurality of third conductive wires 13 also have different diameter dimensions. For this reason, in the second conductive wire 9 and the third conductive wire 13, by setting the conductive wire of the diameter dimension corresponding to the required electric capacity, it is possible to achieve multifunctionalization as a communication wire.
The first conductive wire 8, the second conductive wire 9 and the third conductive wire 13 are each formed of a compressed stranded wire formed by twisting a plurality of thin wires. Therefore, the conductive wire group 18 can be made to have a high electric capacity, and a high flexibility rich in bending displacement can be secured.

  The outer covering layer 20 and the resin body 14 are formed of the same kind of synthetic resin material (flame-retardant polyurethane resin) in order to eliminate migration between them. For this reason, even if the outer cover layer 20 and the resin body 14 are in close contact with each other, the attachment such as a plasticizer does not move between the two. As a result, the outer covering layer 20 and the resin body 14 do not peel off, and it is possible to maintain good adhesion retention between them for a long time.

  All of the core shaft 10, the jacket layer 20 and the resin body 14 are formed of a flame retardant polyurethane resin. For this reason, it is possible to mold these three components cost-effectively by using a common synthetic resin material.

FIG. 4 shows Example 2 of the present invention. In the second embodiment, in the manufacturing method of the multi-core type insulated wire of the first embodiment, an arrangement step is provided instead of the arrangement / filling step (see FIGS. 4A to 4C).
In this arrangement step, for example, the third conductive wire 13 coated with the resin coating 13a of the flame retardant polyurethane resin is prepared and arranged while leaving the void portion Sp in the valley portion 11c. That is, the void portion Sp is not filled with the resin body 14 of the molten resin S1.

  In this case, in the coating step, the resin coating 13a of the third conductive wire 13 is melted by the heat generated during the coating molding of the outer covering layer 20, and the resin coating 13a after melting fills the void Sp as the resin body 14. (Refer FIG.4 (b)). Thereafter, in the coating step, the conductive wire group 18 of the core shaft 10 is coated with the resin layer 14 with the cover layer 20. Even with this configuration, the same effect as that of the first embodiment can be obtained. The same applies to Examples 3 to 6 shown below.

5 and 6 show Embodiment 3 of the present invention. In the third embodiment, the core wire 31 shown in FIG. 5 is allowed to flow through the forming nozzle 30 to form the insulated wire 32.
As shown in FIG. 6C, the core shaft 31 in this case integrally extends and forms a side edge band 31a that is in contact with the core shaft 31. The width dimension W of the side edge band 31 a is set to a size relationship corresponding to the circumferential length of the outer edge portion of the core shaft 31.

A single first conductive wire 8 is embedded in the central portion of the core shaft 31 along the axial direction, and a plurality of second conductive wires 9 are embedded in the side edge band 31a at equal intervals along the width direction. ing. At the outer peripheral edge of the core shaft 31, a narrow groove 31b corresponding to the second conductive wire 9 is formed extending along the line length direction.
As shown in FIGS. 5 and 6 (a), the core shaft 31 is passed through the molding nozzle 30 by extrusion. Thereby, as shown in FIG. 6 (d), the side edge band 31a is curled to the side to cover the outer peripheral edge of the core shaft 31 in a close contact state, and the second conductive wire 9 is tightly fitted in the narrow groove 31b. They are combined to form the insulated wire 32 (see FIG. 6 (e)).

  The insulated wire 32 after passing through the molding nozzle 30 is subjected to an extrusion process by the fourth extruder 35, as shown in FIG. 6 (b). The fourth extruder 35 includes a point 35c having a molding nozzle 35a and a crosshead 35b. The molten resin S4 from the screw 6a of the screw cylinder 6 is fluidly fed to a flow passage 35d formed between the molding nozzle 35a and the cross head 35b.

  In molding and manufacturing the multicore insulated wire 33A, as shown in FIG. 6 (b), the insulated wire body 32 is extruded and passes through the point 35c and, at the same time, the molten resin S4 is flowed and pumped through the flow passage 35d. Thereby, the molten resin S4 forms the outer covering layer 33 covering the outer surface of the insulated wire 32 from the flow passage 35d, and the multicore insulated wire 33A is molded (see FIG. 6 (f)).

  FIG. 7 shows Example 4 of the present invention. The difference of the fourth embodiment from the third embodiment is that the two side edge bands 31e and 31f are formed by extending and forming two side edge bands 31e and 31f in the circumscribed state from the upper and lower sides of the core shaft 31 (FIG. ) And (d)). Each of the side edge bands 31e and 31f has a plurality of second conductive lines 9 embedded therein.

By passing the core shaft 31 through the same forming nozzle as that of the third embodiment, the side edge bands 31e, 31f cover the outer peripheral edge of the core shaft 31 in a close contact state, and the second conductive wire 9 is tightly attached to the narrow groove 31b. And the insulated wire body 32 is shape | molded (refer FIG.7 (b)).
At the same time as passing the insulated wire body 32 to the point 35c in the fourth extrusion molding machine 35 similar to the third embodiment, the molten resin S4 is fluidly pumped to the flow path 35d. As a result, as shown in FIG. 7C, in the covering step, the molten resin S4 forms the outer covering layer 33 on the outer surface of the insulated wire 32 to form the multicore insulated wire 33A.

  8 and 9 show Embodiment 5 of the present invention. The fifth embodiment is different from the first embodiment in that the central hole 11a is omitted, the first conductive wire 8 is not provided, and the second conductive wire 9 of the peak portion 11b is omitted.

For this reason, as shown in FIG. 8 (b), the insulating core shaft 40 having a core shaft structure is solid, and a mode having a plurality of peak portions 40a and a plurality of valley portions 40b is prepared and prepared. (Initial process).
In this case, as shown in FIG. 8A, the core shaft 40 is subjected to an extrusion process by the fifth extruder 41. The fifth extrusion molding machine 41 includes a point 41c having a molding nozzle 41a and a cross head 41b. In the flow passage 41d formed between the molding nozzle 41a and the cross head 41b, the molten resin S5 is screwed and fed by the screw 6a from the screw cylinder 6.

At the time of molding and manufacturing of the multicore insulated wire 40B, first, the conductive wire 13 prepared in the same manner as the third conductive wire of Example 1 is disposed in the valley portion 40a, and the core shaft 40 in this state is a fifth extrusion molding machine At the same time as passing through the point 41c of 41, the molten resin S5 is fluidly pumped to the flow passage 41d.
As a result, the space Sp formed between the valley 40a and the conductive wire 13 is filled with the resin body 14 (see FIG. 8C). At the same time, the insulated wire body 42 is provided with the ridge portion deformation portion 42a in which the ridge portion 40b is laterally deformed in the circumferential direction of the core shaft 40 to cover both the conductive wire 13 and the resin body 14 (arrangement・ Filling and deformation process).

Next, the insulated wire body 42 is allowed to pass through the point 35c of the fourth extruder 35 similar to that of the third embodiment (see FIG. 6B) and, at the same time, the molten resin S4 is flowed and pumped through the flow passage 35d.
As a result, as shown in FIG. 9, the molten resin S4 forms the outer cover layer 43 on the outer surface of the insulated wire 42, and integrally covers the core shaft 40, the conductive wire 13 and the resin body 14 The mold insulated wire 40B is configured (coating step).
In this case and also in Example 6 to be described later, as in Example 2, in place of the filling of the resin body 14, a disposition step may be provided in which the resin coating coated with the conductive wire 13 is melted and used.

  FIG. 10 shows Example 6 of the present invention. The sixth embodiment differs from the fifth embodiment in that the cross section of the solid core shaft 40 is in the shape of a star or starfish (a quadrilateral in which each side forms a curve convex inward). The ridges 40b and the valleys 40a are formed on the upper and lower sides (refer to the initial step of FIG. 10A).

At the time of molding and manufacturing of the multi-core type insulated wire 40B, the fifth extrusion molding machine 41 similar to the fifth embodiment is performed in a state where the conductive wire 13 is disposed in the valley portion 40a similarly to the fifth embodiment of FIG. After being subjected to the extrusion process, as shown in FIG. 10 (b), the insulated wire body 45 provided with the peak portion deformation portion 44 is provided in the arrangement / filling / deformation step.
As shown in FIG. 10 (c), the molten resin S4 forms a cover layer 46 on the outer surface of the insulated wire 45, and covers the core shaft 40, the conductive wire 13 and the resin body 14 integrally. The mold insulated wire 40B is configured (coating step).

[Modification]
(A) The core shaft 10 has four ridges 11 b and four valleys 11 c as multi-separators formed by the mold 7 having a hollow cylinder shaped substantially in the shape of a cross cylinder. Three or four or more peak portions 11 b and valley portions 11 c may be provided as a plurality using the mold 7.
The core shafts 40 of the fifth and sixth embodiments are the same as above.
(B) Although the common flame retardant polyurethane resin was used as the material of the core shaft 10 (40), the resin body 14 and the outer covering layer 20 (33, 43, 46), a normal polyurethane resin, high purity polyethylene You may use synthetic resin materials, such as (PE), ethylene vinyl acetate copolymer (ethylene vinyl acetate copolymer: EVA), a thermoplastic vulcanizate, or a tetrafluoroethylene propylene-based fluororubber.

(C) Further, as materials of the core shaft 10 (40), the resin body 14 and the outer covering layer 20 (33, 43, 46), chlorinated polyolefin, EPDM (ethylene, propylene, Diene, methylene rubber) may be used, or polyamide (PA), polyester, polyimide, polyamideimide, polyacetal, polycarbonate (PC), polyphenylene ether (PPE), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polytetrafluoroethylene Engineering plastic materials such as ethylene (PTFE) or syndiotactic polystyrene (SPS) may be used.

  In the multicore insulated wire according to the present invention, since the plurality of conductive wires are covered together with the resin body by the jacket layer, the shape is maintained tightly bundled all together while securing the entire flexibility. It is possible to secure the sex. The demand from related businesses focusing on the usefulness can be aroused, and the distribution of related parts can contribute to the machine industry.

DESCRIPTION OF SYMBOLS 1 mold 8 1st conductor wire 9 2nd conductor wire 10 axial core 10a outer peripheral edge portion of axial core 11a central portion 11b peak portion 11c valley portion 13 third conductive wire 13a resin coating of third conductive wire 14 resin body 17 insulation Electric wire 18 Conducted wire group 20 Outer cover layer
20A, 33A multi-core type insulated wire S1 to S5 molten resin Sp void

(Regarding claim 1 and claim 2)
The insulating core shaft has a form formed along the axial direction as a core shaft structure, and the outer peripheral edge portion of the core shaft has a plurality of peak portions and a plurality of valley portions which are undulated along the circumferential direction. It is provided continuously.
A plurality of conductive wires are provided in each of the valleys as a whole. A resin body is filled and disposed in a gap formed between the valley and the conductive wire. A peak deformation portion is provided which covers both the conductive wire and the resin body by lateral deformation of the peak. An outer cover layer is provided which covers the core shaft together with the conductive wire, the resin body, and the three parts of the peak portion deformation portion. Further, all of the core shaft, the cover layer and the resin body are formed of a flame retardant polyurethane resin.

In the first and second aspects of the present invention, since the plurality of conductive lines are provided in each valley portion, high density arrangement of the conductive line group is possible. Since the peak deformation portion covers both the conductive wire and the resin body by lateral deformation, the conductive wire and the resin body are integrated and firmly fixed.
In addition, since the conductive wire group of the core shaft is covered with the resin body by the outer covering layer, the shape retention property in which the conductive wire group and the resin body are tightly bundled and collected while securing the entire flexibility. Can be secured.
Furthermore, since the conductive wires of the first conductive wire, the second conductive wire and the third conductive wire do not need to be covered and may be in the form of bare wires, the molding operation is completed in a short time by reducing the number of molding steps. It can contribute to the improvement of productivity.
In addition, since all of the core shaft, the cover layer, and the resin body are formed of the flame-retardant polyurethane resin, these three members can be molded in a cost-effective manner using a common synthetic resin material. can do.

(Regarding Claim 3 and Claim 5 )
The conductive wire is formed of a stranded wire formed by twisting a plurality of thin wires.

According to claims 3 and 5 , high electric capacity can be realized, and high flexibility rich in bending displacement can be obtained.

(Regarding Claim 4 and Claim 6 )
The outer covering layer and the resin body are formed of the same kind of synthetic resin material in order to eliminate migration between them.

In the fourth and sixth aspects of the invention, since there is no migration, even if the outer covering layer and the resin body are in close contact with each other, the attachment such as a plasticizer does not move between the two. . As a result, the outer covering layer and the resin body do not peel off, and it is possible to maintain good adhesion retention between them for a long time.

Claims (8)

A plurality of ridges are provided along the outer peripheral edge so as to have an insulating core axis formed extending in the axial direction, and to divide the outer peripheral edge of the core axis into a plurality of sections in the circumferential direction Core shaft structure in which a plurality of valleys are continuously formed,
A plurality of conductive lines disposed in each of the valleys as a whole;
A resin body filled and disposed in an air gap formed between the valley and the conductive wire;
A ridge deformation portion covering both the conductive wire and the resin body by lateral deformation of the ridge;
A multi-core insulated wire comprising: an outer cover layer covering the core shaft together with the conductive wire, the resin body, and the ridge deformation portion. A plurality of mountains having insulating core axes formed extending in the axial direction, and undulating along the outer peripheral edge so as to divide the outer peripheral edge of the core axis into a plurality of sections in the circumferential direction An initial step of preparing a core shaft structure in which a portion and a plurality of valleys are continuously formed;
A conductive wire is prepared and disposed in the valley, and a gap formed between the valley and the conductive wire is filled with a resin body, and a peak which covers both the conductive wire and the resin body An arrangement / filling / deformation step of laterally deforming the peak portion in the circumferential direction of the core shaft to provide a deformation portion;
Manufacturing a multi-core type insulated wire characterized in comprising a covering step of forming an outer covering layer integrally covering the core shaft with the conductive wire, the resin body and the ridge portion deformation portion. Method.   The multifilamentary insulated wire according to claim 1, wherein the conductive wire comprises a stranded wire formed by twisting a plurality of thin wires.   The multicore insulated wire according to claim 1, wherein the outer covering layer and the resin body are formed of the same kind of synthetic resin material in order to eliminate the mutual migration between them.   The multicore insulated wire according to claim 1, wherein all of the core shaft, the outer cover layer and the resin body are made of a flame retardant polyurethane resin.   The method according to claim 2, wherein the conductive wire comprises a stranded wire formed by twisting a plurality of thin wires.   3. The multicore insulated wire according to claim 2, wherein the outer covering layer and the resin body are formed of the same kind of synthetic resin material in order to eliminate migration between them. Method.   The method for manufacturing a multi-core insulated wire according to claim 2, wherein all of the core shaft, the outer cover layer and the resin body are made of a flame retardant polyurethane resin.

Images