Composite cable

Abstract

To provide a composite cable which can form the cross-sectional shape of the composite cable into a shape close to a circle, even if the amount of interposition is not necessarily large.SOLUTION: A composite cable includes an aggregate formed by twisting a first electric wire, a second electric wire and a third electric wire, a tape member spirally wound around the aggregate, and an external sheath. Each of the first electric wire and the second electric wire includes one central conductor, and an insulator. The third electric wire includes paired twisted wires formed by twisting two core wires, and an internal sheath. Each of a ratio of the outer diameter of the third electric wire to the outer diameter of the first electric wire, and a ratio of the outer diameter of the third electric wire to the outer diameter of the second electric wire is 0.9 or more and 1.1 or less. The twisting direction in the aggregate, and a winding direction of the tape member are opposite to each other.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to composite cables. [Background technology]

[0002] Patent Document 1 discloses a composite cable. The composite cable includes an assembly in which a plurality of electric wires and a plurality of interposers are twisted together, a tape member wrapped around the assembly, and an outer sheath that covers the tape member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-86780 Summary of the Invention [Problem to be solved by the invention]

[0004] In order to reduce the number of parts constituting a composite cable and to reduce the weight of the composite cable, it is preferable to reduce the amount of filler. However, in conventional composite cables, when the amount of filler is reduced, it is difficult to make the cross-sectional shape of the composite cable close to a circle.

[0005] In one aspect of the present disclosure, it is preferable to provide a composite cable that can have a cross-sectional shape that is close to a circle even if the amount of intercalation is not necessarily large. [Means for solving the problem]

[0006] One aspect of the present disclosure is a composite cable including an assembly in which a first electric wire, a second electric wire, and a third electric wire are twisted together so that their outer circumferential surfaces are in contact with each other, a tape member wound helically around the assembly, and an outer sheath covering the periphery of the tape member.

[0007] The first electric wire and the second electric wire each include one central conductor and an insulator covering the central conductor. The third electric wire includes a twisted pair formed by twisting two core wires together and an inner sheath covering the twisted pair. A ratio of an outer diameter of the third electric wire to an outer diameter of the first electric wire and a ratio of an outer diameter of the third electric wire to an outer diameter of the second electric wire are each 0.9 or more and 1.1 or less. The twisting direction in the assembly is opposite to the winding direction of the tape member.

[0008] According to the composite cable which is one aspect of the present disclosure, even if the amount of intercalation is not necessarily large, the cross-sectional shape of the composite cable can be made to be nearly circular. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a plan view showing the configuration of a composite cable. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Diagram 3] Fig. 3A is a cross-sectional view showing the outer diameter and the thickness of the insulator of a first electric wire, Fig. 3B is a cross-sectional view showing the outer diameter and the thickness of the insulator of a second electric wire, and Fig. 3C is a cross-sectional view showing the outer diameter and the thickness of the insulator of a third electric wire. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Exemplary embodiments of the present disclosure will now be described with reference to the drawings. First Embodiment 1. Configuration of composite cable 1 The configuration of the composite cable 1 will be described with reference to Figures 1, 2, 3A, 3B, and 3C. The composite cable 1 is used, for example, in vehicles such as automobiles and railway cars. As shown in Figure 1, the composite cable 1 is a linear member. In any cross section perpendicular to the longitudinal direction of the composite cable 1, the composite cable 1 has the configuration shown in Figure 2.

[0011] The composite cable 1 includes an assembly 3. The assembly 3 is composed of a first electric wire 5, a second electric wire 7, and a third electric wire 9. The first electric wire 5, the second electric wire 7, and the third electric wire 9 are twisted together. The outer circumferential surfaces of the first electric wire 5, the second electric wire 7, and the third electric wire 9 are in contact with each other. That is, the outer circumferential surface of the first electric wire 5 is in contact with the outer circumferential surface of the second electric wire 7. Furthermore, the outer circumferential surface of the second electric wire 7 is in contact with the outer circumferential surface of the third electric wire 9. Furthermore, the outer circumferential surface of the first electric wire 5 is in contact with the outer circumferential surface of the third electric wire 9.

[0012] The composite cable 1 includes a tape member 11. The tape member 11 is wound around the assembly 3. The tape member 11 is a long, thin, strip-shaped member. The tape member 11 is wound spirally so that parts of the tape member 11 overlap in the width direction. The winding direction of the tape member 11 is opposite to the twisting direction of the assembly 3.

[0013] For example, the first electric wire 5, the second electric wire 7, and the third electric wire 9 are twisted together, and therefore when viewed from the Q direction shown in FIG. 1, they extend in the P direction while rotating clockwise. On the other hand, the spirally wound tape member 11 extends in the P direction while rotating counterclockwise when viewed from the Q direction shown in FIG. 1. The P direction and the Q direction are both parallel to the longitudinal direction of the composite cable 1. In this case, the twisting direction in the assembly 3 is clockwise. The winding direction of the tape member 11 is counterclockwise. Therefore, the winding direction of the tape member 11 is opposite to the twisting direction in the assembly 3. Alternatively, the twisting direction in the assembly 3 may be counterclockwise, and the winding direction of the tape member 11 may be clockwise.

[0014] The tape member 11 is in contact with the assembly 3 and an outer sheath 13 described later. The tape member 11 is, for example, a paper tape, a nonwoven fabric tape, a resin tape, etc. There is no intermediate material between the assembly 3 and the tape member 11. The composite cable 1 includes an outer sheath 13. The outer sheath 13 covers the periphery of the tape member 11. Examples of the material of the outer sheath 13 include thermoplastic resin, rubber, etc. Examples of the thermoplastic resin include thermoplastic urethane, etc. Examples of the rubber include ethylene propylene diene rubber (EPDM). The thermoplastic resin and rubber may or may not be crosslinked. The thickness of the outer sheath 13 is preferably 0.3 mm or more and 3.0 mm or less.

[0015] The first electric wire 5 includes one central conductor 21 and an insulator 23. The central conductor 21 is formed, for example, by twisting together a plurality of conductor wires. The central conductor 21 is made of, for example, copper or a copper alloy. The central conductor 21 is covered with the insulator 23. The insulator 23 is made of, for example, polyethylene. The second electric wire 7 has a similar configuration to the first electric wire 5. The first electric wire 5 and the second electric wire 7 are, for example, power lines for electric brakes or power lines for electric parking brakes.

[0016] The third electric wire 9 includes a twisted pair 25 and an inner sheath 27. The twisted pair 25 is formed by twisting two core wires 29 together. Each of the two core wires 29 includes a conductor 31 and an insulator 33. The conductor 31 is formed, for example, by twisting a plurality of conductor wires together. The conductor 31 is made of, for example, copper or a copper alloy. The insulator 33 is made of, for example, polyethylene. The two core wires 29 are, for example, signal wires for an ABS sensor. The inner sheath 27 covers the twisted pair 25. The inner sheath 27 is made of, for example, thermoplastic urethane. A part of the inner sheath 27 enters between the two core wires 29. More specifically, a part of the inner sheath 27 enters into a valley formed by the contact of the two core wires 29. That is, the third electric wire 9 is a multi-core electric wire with a solid structure. The twisting direction of the two core wires 29 in the twisted pair wire 25 is opposite to the twisting direction of the first electric wire 5, the second electric wire 7, and the third electric wire 9 in the assembly 3. The twisting direction of the multiple conductor wires in the central conductor 21 of the first electric wire 5 and the second electric wire 7 is the same as the twisting direction of the two core wires 29 in the twisted pair wire 25. The twisting direction of the two core wires 29 in the twisted pair wire 25 is opposite to the twisting direction of the multiple conductor wires in the conductors 31 of the two core wires 29.

[0017] As shown in FIG. 3A, the outer diameter of the first electric wire 5 is R1. The thickness of the insulator 23 in the first electric wire 5 is r1. As shown in FIG. 3B, the outer diameter of the second electric wire 7 is R2. The thickness of the insulator 23 in the second electric wire 7 is r2. As shown in FIG. 3C, the outer diameter of the third electric wire 9 is R3. The thickness of the inner sheath 27 in the third electric wire 9 is r3. The outer diameter of the twisted pair wire 25 is r4. FIGS. 3A, 3B, and 3C are all cross-sectional views of the composite cable 1 at a cross section perpendicular to the longitudinal direction. r3 is expressed by the following (Equation 1).

[0018] (Formula 1) r3=(R3-r4) / 2 The outer diameter r4 of the twisted pair wire 25 is the sum of the outer diameter of one core wire 29 and the outer diameter of the other core wire 29. The ratio of the outer diameter R3 of the third electric wire 9 to the outer diameter R1 of the first electric wire 5 is R3 / R1. The ratio of the outer diameter R3 of the third electric wire 9 to the outer diameter R2 of the second electric wire 7 is R3 / R2. The value of R3 / R1 is 0.9 or more and 1.1 or less. The value of R3 / R1 is preferably 0.92 or more and 1.08 or less, more preferably 0.95 or more and 1.05 or less, and particularly preferably 0.98 or more and 1.02 or less.

[0019] The value of R3 / R2 is 0.9 or more and 1.1 or less. The value of R3 / R2 is preferably 0.92 or more and 1.08 or less, more preferably 0.95 or more and 1.05 or less, and particularly preferably 0.98 or more and 1.02 or less. For example, the thickness r3 is equal to or greater than the thickness r1. For example, the thickness r3 is equal to or greater than the thickness r2.

[0020] 2. Benefits of Composite Cable 1 (1A) In the composite cable 1, the value of R3 / R1 is 0.9 or more and 1.1 or less. The value of R3 / R2 is 0.9 or more and 1.1 or less. The winding direction of the tape member 11 is opposite to the twisting direction in the assembly 3.

[0021] Therefore, even if the amount of intervening wires in the composite cable 1 is not necessarily large, the cross-sectional shape of the composite cable 1 can be made to be nearly circular. When the cross-sectional shape of the composite cable 1 is close to a circle, the task of removing the outer sheath 13 becomes easier. Furthermore, when the composite cable 1 is passed through and fixed in a grommet or a rubber tube, if the cross-sectional shape of the composite cable 1 is close to a circle, the contact area between the outer circumferential surface of the composite cable 1 and the inner circumferential surface of the grommet or rubber tube becomes large. As a result, the force for fixing the composite cable 1 to the grommet or rubber tube becomes large.

[0022] Note that there are valleys between adjacent electric wires on the outer peripheral surface of the assembly 3. That is, there are valleys between the first electric wire 5 and the second electric wire 7, between the second electric wire 7 and the third electric wire 9, and between the third electric wire 9 and the first electric wire 5 on the outer peripheral surface of the assembly 3. The valleys between the electric wires extend helically on the outer circumferential surface of the assembly 3 along the twisting direction of the assembly 3. If the winding direction of the tape member 11 is opposite to the twisting direction of the assembly 3, the extension direction of the valleys between the electric wires is unlikely to coincide with the longitudinal direction of the tape member 11, and the two will intersect. Therefore, the tape member 11 is unlikely to enter into the valleys between the electric wires. As a result, the cross-sectional shape of the composite cable 1 becomes closer to a circle.

[0023] (1B) As described above, even if the amount of inclusions in the composite cable 1 is not necessarily large, the cross-sectional shape of the composite cable 1 can be made nearly circular. Therefore, the amount of inclusions in the composite cable 1 can be reduced.

[0024] When processing the terminal of the composite cable 1 and connecting it to a connector or the like, it is necessary to remove the insulator. If the amount of insulator can be reduced, the task of removing the insulator becomes easier. Furthermore, if the amount of insulator can be reduced, the number of parts constituting the composite cable 1 can be reduced, and the composite cable 1 can be made lighter. <Other embodiments> Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments and can be implemented in various modified forms.

[0025] (1) In the first embodiment, the composite cable 1 does not include any filler. The composite cable 1 may include a filler. (2) The function of one component in each of the above embodiments may be shared by multiple components, or the functions of multiple components may be performed by one component. Also, part of the configuration of each of the above embodiments may be omitted. Also, at least part of the configuration of each of the above embodiments may be added to or substituted for the configuration of another of the above embodiments.

[0026] (3) In addition to the above-described composite cable 1, the present disclosure can be realized in various forms, such as a system including the composite cable 1 as a component, a method for manufacturing the composite cable 1, and the like. [Explanation of symbols]

[0027] Reference Signs List 1...composite cable, 3...assembly, 5...first electric wire, 7...second electric wire, 9...third electric wire, 11...tape member, 13...outer sheath, 21...center conductor, 23...insulator, 25...twisted pair wire, 27...inner sheath, 29...core wire, 31...conductor, 33...insulator

Claims

1. an assembly in which the first electric wire, the second electric wire, and the third electric wire are twisted together so that their outer circumferential surfaces are in contact with each other; a tape member spirally wrapped around the assembly; an outer sheath that covers the periphery of the tape member; Equipped with Each of the first electric wire and the second electric wire includes a central conductor and an insulator covering the central conductor, The third electric wire includes a twisted pair wire formed by twisting two core wires together, and an inner sheath that covers the twisted pair wire and has a part of it inserted between the two core wires, a ratio of an outer diameter of the third electric wire to an outer diameter of the first electric wire and a ratio of an outer diameter of the third electric wire to an outer diameter of the second electric wire are each 0.9 or more and 1.1 or less; The twisting direction of the assembly is opposite to the winding direction of the tape member. Composite cable.

2. 2. The composite cable of claim 1, A thickness of the inner sheath is equal to or greater than a thickness of the insulator in the first electric wire and is equal to or greater than a thickness of the insulator in the second electric wire. Composite cable.

3. 2. The composite cable of claim 1, There is no interposition between the assembly and the tape member. Composite cable.

4. 2. The composite cable of claim 1, The central conductor of the first electric wire and the central conductor of the second electric wire are formed by twisting together a plurality of conductor wires, The twisting direction of the plurality of conductor wires is the same as the twisting direction of the two core wires in the twisted pair wire. Composite cable.

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