JP2019160677A - Insulated wire and wire harness - Google Patents

Abstract

To provide an insulated wire capable of suppressing excessive increase of a wire diameter, and improving heat dissipation; and to provide a wire harness.SOLUTION: An insulated wire 1 includes a conductive conductor part 10, an insulating coating part 20 coated on the conductor part 10, and a fiber layer 30 wound around the coating part 20, and having carbon fibers having metal plating applied thereto. The fiber layer 30 is wound with 0.6 MPa or more to the coating part 20. The fiber layer 30 is formed by winding spirally the carbon fibers having metal plating applied thereto around the coating part 20.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an insulated wire and a wire harness.

  Conventionally, the number of insulated wires through which a large current flows is increasing for reasons such as an increase in EV cars. However, the insulated wire generates heat when a large current flows, and the allowable current value decreases. For this reason, it is necessary to take measures for heat dissipation of electric wires.

  Therefore, a circulation path provided with a refrigerant is arranged along the wire coating (for example, see Patent Documents 1 and 2), or a void portion in a sheath for housing the wire is filled with carbon fiber or a silicon-based material (for example, a patent Document 3) has been proposed.

  However, in the electric wires described in Patent Documents 1 to 3, since the circulation path is along the electric wire coating or filled with carbon fiber or silicon-based material, the electric wire diameter is excessively increased. .

  Therefore, a plurality of circuit cables in which carbon fibers plated with metal around the insulated wires are arranged in the longitudinal direction of the wires have been proposed (for example, see Patent Document 4). The multiple circuit cable is disposed outside the inner transmission body that transmits the first signal or power, the inner insulator that covers the outer periphery of the inner transmission body, and transmits the second signal or power. An outer transmission body and an outer insulator covering the outer periphery of the outer transmission body are provided. The outer transmission body is composed of a plurality of conductive fibers having conductivity. Carbon fibers subjected to metal plating can be used as the conductive fibers.

  In such a multi-circuit cable, although the outer transmission body transmits the second signal or power, the heat can be suitably radiated by the carbon fiber and the metal plating when the inner transmission body generates heat. More specifically, carbon fibers tend to have high thermal conductivity in the fiber longitudinal direction and low in the fiber diameter direction. However, heat transfer can be suitably performed in the fiber radial direction by applying metal plating to the carbon fiber. Therefore, the said multiple circuit cable can perform heat dissipation by transferring heat to a fiber longitudinal direction and a fiber radial direction.

JP-A-10-106362 JP 59-56311 A JP 2012-146542 A Japanese Patent Application Laid-Open No. 2006-12296

  However, the cable described in Patent Document 4 is gently in contact with the electric wire because the metal-plated carbon fibers are arranged along the longitudinal direction of the electric wire (inner transmission body and inner insulator). However, a gap is easily generated between the metal-plated carbon fiber and the electric wire. When a gap is generated between the metal-plated carbon fiber and the electric wire, heat from the electric wire is hardly transmitted to the metal-plated carbon fiber side, and heat dissipation is reduced.

  The present invention has been made in order to solve such a conventional problem, and an object of the present invention is to provide an insulated wire capable of suppressing an excessive increase in the wire diameter and improving heat dissipation. It is to provide a wire harness.

  The insulated wire of the present invention includes a conductive conductor portion, an insulating covering portion coated on the conductor portion, a fiber layer having carbon fibers wound around the covering portion and subjected to metal plating, It has. The fiber layer is wound around the covering portion at 0.6 MPa or more.

  According to the present invention, since the fiber layer having the carbon fiber subjected to metal plating is wound at 0.6 MPa or more on the covering portion, the carbon fiber or silicon-based material is filled along the circulation path. In addition, the fiber layer is suitably brought into contact with the covering portion, and the occurrence frequency of a gap between them is reduced. Therefore, it is possible to provide an insulated wire and a wire harness that can suppress an excessive increase in the wire diameter and can improve heat dissipation.

It is a lineblock diagram showing the wire harness containing the insulated wire concerning the embodiment of the present invention. It is a structural diagram which shows the insulated wire shown in FIG. It is a structural diagram which shows the modification of the insulated wire shown in FIG. It is a graph which shows the experimental result of the insulated wire which concerns on Example 1, 2 and Comparative example 1,2. It is a graph which shows the experimental result of the insulated wire which concerns on Examples 3-6 and Comparative Examples 2 and 3. FIG. It is a block diagram which shows the 2nd modification of the insulated wire shown in FIG.

  Hereinafter, the present invention will be described according to preferred embodiments. Note that the present invention is not limited to the embodiments described below, and can be appropriately changed without departing from the spirit of the present invention. Further, in the embodiment shown below, there are places where illustration and description of a part of the configuration are omitted, but the details of the omitted technology are within the scope that does not conflict with the contents described below. It goes without saying that known or well-known techniques are applied as appropriate.

  Drawing 1 is a lineblock diagram showing the wire harness containing the insulated wire concerning the embodiment of the present invention. As shown in FIG. 1, the wire harness WH includes an insulated wire 1 described in detail below and another wire 100.

  The insulated wire 1 has a configuration excellent in heat dissipation, and the other wire 100 has a conductive conductor portion and an insulating covering portion coated on the conductor portion, and is insulated. It has a configuration that does not have the same heat dissipation structure (fiber layer 30 described later) as the electric wire 1. These insulated wires 1 and other wires 100 are in contact with each other. For example, a terminal (not shown) is crimped to the insulated wire 1 and the other wire 100, and the terminal is accommodated in the connector C to form a wire harness WH. The insulated wire 1 and the other wires 100 may be provided with an exterior member such as a corrugated tube (not shown) or may be provided with other members. Further, the connector C is not essential for the wire harness WH.

  FIG. 2 is a structural diagram showing the insulated wire 1 shown in FIG. As shown in FIG. 2, the insulated wire 1 includes a conductor portion 10, a covering portion 20, and a fiber layer 30.

  The conductor 10 is made of a conductive metal such as an annealed copper wire, a silver-plated annealed copper wire, a tin-plated annealed copper wire, and a tin-plated copper alloy wire. In addition, in this embodiment, although the conductor part 10 is comprised by one metal wire, it may not be restricted to this, for example, may be comprised by the several strand wire.

  The coating | coated part 20 is a member coat | covered on the conductor part 10, Comprising: For example, it is comprised by insulating members, such as PVC (Polyvinyl Chloride), PE (Polyethylene), or PP (Polypropylene).

  The fiber layer 30 is a member that is wound so as to cover the entire surface of the covering portion 20, and is made of carbon fiber that has been subjected to metal plating. The fiber layer 30 functions to receive the heat of the conductor portion 10 through the covering portion 20 and to release the received heat to the outside.

  Here, the metal to be plated has a thermal conductivity higher than the thermal conductivity in the fiber diameter direction of the carbon fiber, and copper is employed in this embodiment. In the present embodiment, the diameter of the carbon fiber is, for example, 5 μm or more and 7 μm or less. The plating may be applied to two or more layers with different metals.

  In the present embodiment, the fiber layer 30 is wound around the covering portion 20 at 0.6 MPa or more. For this reason, the fiber layer 30 is wound with a relatively small gap with respect to the covering portion 20 and can suitably receive heat from the conductor portion 10.

  The fiber layer 30 is preferably wound around the covering portion 20 at 2.5 MPa or more. This is because, when the wire is wound at 2.5 MPa or more, the carbon fiber is wound so as to bite into the covering portion 20, and heat from the conductor portion 10 can be more suitably received.

  Furthermore, it is preferable that the fiber layer 30 is formed by winding a carbon fiber bundle on which metal plating has been performed in a spiral manner around the covering portion 20. When the carbon fiber bundle subjected to metal plating is spirally wound, the fiber layer 30 can be easily wound so as to be fastened to the covering portion 20, and the winding pressure on the covering portion 20 can be easily increased to 0.6 MPa or more. Because.

  The fiber layer 30 is not limited to a case where a metal-plated carbon fiber bundle is spirally wound, and for example, a metal-plated carbon fiber is formed into a sheet shape and a sheet is vertically attached. It may be.

  FIG. 3 is a structural diagram showing a modified example of the insulated wire 1 shown in FIG. As shown in FIG. 3, the fiber layer 30 is not limited to being wound so as to cover the entire surface of the covering portion 20, but is spirally wound with a gap S in the longitudinal direction of the covering portion 20. May be. In this case, the ratio of the surface area of the covering portion 20 exposed from the gap S between the fiber layers 30 is preferably 50% or less with respect to the entire surface area of the covering portion 20.

  Next, examples and comparative examples will be described with reference to FIGS. FIG. 4 is a table showing experimental results of the insulated wires according to Examples 1 and 2 and Comparative Examples 1 and 2.

  In the insulated wire according to Example 1, pure copper was used as the conductor portion, and PVC was used as the covering portion. A carbon fiber bundle subjected to copper plating was used as the fiber layer, and this was spirally wound around the coating portion without a gap to form a fiber layer. In addition, the pressure sensitive paper which reacts at 0.6 MPa was arrange | positioned between the coating | coated part and the fiber layer, and the carbon fiber bundle by which the copper plating was performed was wound so that a pressure sensitive paper might react. That is, the winding pressure was set to 0.6 MPa or more.

  About the insulated wire which concerns on Example 2, the pressure sensitive paper which reacts at 2.5 Mpa is arrange | positioned between a coating | coated part and a fiber layer, and the carbon fiber bundle by which the copper plating was performed so that a pressure sensitive paper reacts is wound It was. That is, the winding pressure was 2.5 MPa or more. Others were the same as in Example 1.

  About the insulated wire which concerns on the comparative example 1, the pressure sensitive paper which reacts at 0.2 Mpa is arrange | positioned between a coating | coated part and a fiber layer, and the carbon fiber bundle by which the copper plating was performed so that a pressure sensitive paper does not react is wound It was. That is, the winding pressure was less than 0.2 MPa. Others were the same as in Example 1.

  About the insulated wire which concerns on the comparative example 2, it is the multiple circuit cable of patent document 4, Comprising: The internal insulator comprised by PVC was provided on the internal transmission body comprised by pure copper. A copper-plated carbon fiber bundle is arranged on the inner insulator in a uniform manner (that is, along the longitudinal direction of the inner insulator), and a sheath is provided on the copper-plated carbon fiber bundle. It was.

  The temperature of the conductor part (internal transmission body) and the fiber layer (copper-plated carbon) when a current of 3 A is applied to the insulated wires according to Examples 1 and 2 and Comparative Examples 1 and 2 for 1 minute. The temperature of the fiber) was measured.

  In Example 1, the temperature of the conductor portion was 34.1 ° C., and the temperature of the carbon fiber plated with copper was 31.7 ° C. In Example 2, the temperature of the conductor portion was 32.4 ° C., and the temperature of the carbon fiber plated with copper was 29.1 ° C. In Comparative Example 1, the temperature of the conductor portion was 42.5 ° C., and the temperature of the carbon fiber plated with copper was 39.4 ° C. In Comparative Example 2, the temperature of the conductor part (internal transmission body) was 40.8 ° C., and the temperature of the copper-plated carbon fiber was 35.4 ° C.

  For this reason, as in Examples 1 and 2, when the winding pressure is 0.6 MPa or more, the temperature of the conductor portion can be lowered compared to Comparative Example 2 (multiple circuit cables described in Patent Document 4), and high heat dissipation is achieved. It was found that sex can be obtained. In particular, it was found that when the winding pressure was 2.5 MPa or more as in Example 2, higher heat dissipation was obtained. On the other hand, as in Comparative Example 1, it was found that the heat release performance was lower than that of Comparative Example 2 when the winding pressure was less than 0.2 MPa.

  FIG. 5 is a chart showing experimental results of insulated wires according to Examples 3 to 6 and Comparative Examples 2 and 3.

  In the insulated wire according to Example 3, pure copper was used as the conductor portion, and PVC was used as the covering portion. A carbon fiber bundle subjected to copper plating was used as the fiber layer, and this was spirally wound around the coating portion without a gap to form a fiber layer. The winding pressure was 0.6 MPa.

  The insulated wire according to Example 4 is a fiber layer in which a copper-plated carbon fiber bundle is spirally wound so that the ratio of the exposed area of the covering portion (ratio to the entire surface area of the covering portion) is 30%. Formed. Others were the same as in Example 3.

  In the insulated wire according to Example 5, the fiber layer was formed by spirally winding a carbon fiber bundle on which copper plating was applied so that the ratio of the exposed area of the covering portion was 50%. Others were the same as in Example 3.

  In the insulated wire according to Example 6, the carbon fiber bundle subjected to copper plating was spirally wound so that the ratio of the exposed area of the covering portion was 70%, thereby forming a fiber layer. Others were the same as in Example 3.

  The insulated wire according to Comparative Example 2 is the same as that shown in FIG.

  The insulated wire according to Comparative Example 3 was not provided with a fiber layer, and the others were the same as Example 3.

  The temperature of the conductor part and the temperature of the fiber layer (copper-plated carbon fiber) when a current of 3 A is passed through the insulated wires according to Examples 3 to 6 and Comparative Examples 2 and 3 for only 1 minute ( However, for Comparative Example 3, the surface temperature of the covering portion was measured.

  In Example 3, the temperature of the conductor part was 31.7 ° C., and the temperature of the carbon fiber plated with copper was 28.3 ° C. In Example 4, the temperature of the conductor portion was 34.8 ° C., and the temperature of the copper-plated carbon fiber was 28.7 ° C. In Example 5, the temperature of the conductor portion was 37.4 ° C., and the temperature of the carbon fiber plated with copper was 32.8 ° C. In Example 6, the temperature of the conductor portion was 46.3 ° C., and the temperature of the carbon fiber plated with copper was 41.5 ° C.

  In Comparative Example 2, as described above, the temperature of the conductor portion (internal transmission body) was 40.8 ° C., and the temperature of the copper-plated carbon fiber was 35.4 ° C. In Comparative Example 3, the temperature of the conductor portion was 52.5 ° C., and the surface temperature of the covering portion was 37.4 ° C.

  For this reason, the insulated wire which concerns on Examples 3-6 can lower the temperature of a conductor part rather than the insulated wire which concerns on the comparative example 3, and it turned out that heat dissipation improves. In particular, as in Examples 3 to 5, it was found that when the exposed area ratio was 50% or less, the temperature of the conductor portion could be lowered as compared with Comparative Example 2, and high heat dissipation was obtained.

  In Example 6, the temperature of the conductor part is higher than that in Comparative Example 2. However, in Comparative Example 2, carbon fibers plated with copper are arranged so as to cover the entire area of the covering portion, and Example 6 covers only 30%, and when covered at the same rate, Example 6 is covered. It was also confirmed that the heat dissipation property of was superior to that of Comparative Example 2 (not shown).

  Thus, according to the insulated wire 1 according to the present embodiment, since the fiber layer 30 having the carbon fiber subjected to metal plating is wound around the covering portion 20 at 0.6 MPa or more, the circulation path The fiber layer 30 is suitably brought into contact with the covering portion 20 and the occurrence of gaps between the two is reduced. Become. Therefore, it is possible to provide the insulated wire 1 capable of suppressing an excessive increase in the wire diameter and improving the heat dissipation.

  Further, since the fiber layer 30 is formed by winding a metal-plated carbon fiber spirally around the covering portion 20, the fiber layer 30 can be easily wound so as to be fastened to the covering portion 20, The winding pressure around the covering portion 20 can be easily set to 0.6 MPa or more.

  Further, the ratio of the surface area of the covering portion 20 that the carbon fiber subjected to metal plating is spirally wound with the gap S in the longitudinal direction of the covering portion 20 and is exposed from the gap S of the fiber layer 30 is: The total surface area of the covering portion 20 is 50% or less. For this reason, the insulated wire 1 which can ensure the heat dissipation more than predetermined can be provided.

  Furthermore, according to the wire harness WH which concerns on this embodiment, since the said insulated wire 1 and the other electric wire 100 are provided, it also becomes possible to thermally radiate the other electric wire 100 using the heat dissipation of the insulated wire 1. FIG. Moreover, the heat dissipation of the whole wire harness WH can be aimed at.

  As described above, the present invention has been described based on the embodiments, but the present invention is not limited to the above-described embodiments, and modifications may be made without departing from the spirit of the present invention. You may combine.

  For example, in the above embodiment, the fiber layer 30 has a structure exposed to the outside air, but is not limited to this, for example, a metal wire or the like for releasing the heat of the fiber layer 30 to other members is further provided. You may come to perform positive heat dissipation from another member. Furthermore, without providing a metal wire or the like, the fiber layer 30 may be brought into contact with another member to actively dissipate heat from the other member.

  Further, in the above embodiment, it is assumed that the fiber layer 30 is configured by spirally winding one bundle of metal-plated carbon fibers on the covering portion 20, but not limited to this, two or more bundles are wound. It may be configured.

  In addition, the insulated wire 1 may be configured as shown in FIG. FIG. 6 is a configuration diagram illustrating a second modification of the insulated wire 1 illustrated in FIG. 1. As illustrated in FIG. 6, the fiber layer 30 is collectively wound around the plurality of covering portions 20 that cover each of the plurality of conductor portions 10. That is, the fiber layer 30 may be wound so as to straddle a plurality of electric wires. Furthermore, in FIG. 6, although it winds around 2 electric wires collectively, it is not restricted to this, You may wind around 3 or more collectively.

1: Insulated electric wire 10: Conductor portion 20: Covering portion 30: Fiber layer 100: Other electric wire WH: Wire harness

Claims (5)

A conductive conductor,
An insulating covering portion coated on the conductor portion;
A fiber layer having carbon fibers wound around the covering portion and subjected to metal plating;
The insulated wire, wherein the fiber layer is wound around the covering portion at 0.6 MPa or more. 2. The insulated wire according to claim 1, wherein the fiber layer is formed by winding a metal fiber-plated carbon fiber spirally around the covering portion. The fiber layer is a spirally wound carbon fiber with metal plating, with a gap in the longitudinal direction of the covering portion,
The insulated wire according to claim 2, wherein a ratio of a surface area of the covering portion exposed from a gap between the fiber layers is 50% or less with respect to an entire surface area of the covering portion. 4. The fiber layer according to claim 1, wherein the fiber layer is collectively wound around the plurality of covering portions covering each of the plurality of conductor portions. 5. Insulated wire. The insulated wire according to any one of claims 1 to 4,
Other conductive wires having a conductive conductor portion and an insulating covering portion coated on the conductor portion, and not having the fiber layer,
A wire harness comprising:

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