JP6063551B2 - Electrical wire - Google Patents

Description

  The present invention relates to an electric wire.

  In recent years, products with low carbon dioxide emissions have been accepted by the market due to global warming. In particular, automobiles are desired to suppress carbon dioxide emissions due to a synergistic effect with the rise in crude oil prices, and the demand for weight reduction of automobile wires is increasing day by day in order to improve fuel efficiency.

  However, since the specific gravity of each metal is determined in an automotive electric wire such as an annealed copper stranded wire or a copper alloy stranded wire, the only way to reduce the weight is to reduce the diameter.

  Therefore, a conductive high-strength cord in which high-strength fibers such as aramid fiber, polyarylate fiber, and PBO (poly-p-phenylenebenzobisoxazole) fiber are subjected to metal plating and twisted together has been proposed (for example, Patent Document 1). In addition, there has been proposed an electric wire obtained by pre-plating a polymer fiber using a supercritical fluid and then twisting the strands subjected to electroless copper plating with high adhesion to make a conductor part (for example, patent document) 2). According to these, since the thing which plated the fiber was used as a conductor, weight reduction can be achieved.

JP 2008-130241 A JP 2009-242839 A

  However, according to the electric wires described in Patent Documents 1 and 2, although it is possible to reduce the weight, it is difficult to cut with a rubbing blade. That is, the high-strength fiber itself is strong against bending and has high strength. For this reason, when it is going to cut | disconnect by a rubbing blade, a high strength fiber may enter between rubbing blades, and it may become difficult to cut.

  The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide an electric wire capable of facilitating cutting with a friction blade while reducing the weight. There is.

The electric wire of the present invention is an electric wire in which an element wire obtained by metal plating on an aramid fiber, polyarylate fiber, or PBO fiber is used as a conductor portion, and the conductor portion is covered with a covering portion, and has an adhesion strength conforming to ISO6722. In the measuring method, the adhesion between the conductor and the covering is 8 N or more, and the adhesion per unit area is 0.4 N / mm ² or less.

  According to the electric wire of the present invention, since it is an electric wire in which an element wire obtained by metal plating on an aramid fiber, a polyarylate fiber or a PBO fiber is used as a conductor portion and the conductor portion is covered with a covering portion, the weight of the fiber can be reduced. Can do. Moreover, in the measuring method of the adhesive force based on ISO6722, the adhesive force of a conductor part and a coating | coated part is 8N or more and below the peelable adhesive force. Here, since the adhesive force between the conductor portion and the covering portion is 8N or more, the gap between the covering portion and the conductor portion is reduced when cutting with the rubbing blade, and the conductor portion and the covering portion are combined. The escape area of the conductor portion is lost, and it becomes difficult for high-strength fibers to enter between the rubbing blades. Thereby, the cutting can be facilitated. Also, since the contact strength between the conductor and the covering is less than the peelable contact strength, the contact strength does not become too high, and it is possible to prevent a situation in which a peeling defect occurs and the wire becomes a defective product. Can do. Accordingly, it is possible to facilitate the cutting with the rubbing blade while reducing the weight.

In the above description, the peelable adhesion force means the peelable adhesion force (N) = 0.4 × the peeled area (mm ² ) = 0.4 × the contact area between the conductor portion of the peeled portion and the covering portion. (Mm ² ) = 0.4 × peeling length (mm) × contact distance (mm) at which the conductor portion and the covering portion are in a substantially circular shape.

  According to the electric wire of the present invention, it is possible to facilitate the cutting with the rubbing blade while reducing the weight.

It is a figure which shows the electric wire which concerns on embodiment of this invention. It is the schematic which shows the mode of the cutting | disconnection of the electric wire which concerns on this embodiment. It is the schematic which shows an example in case cutting | disconnection becomes difficult. It is a 1st graph which shows an experimental result when the electric wire which concerns on this embodiment is cut | disconnected with a rubbing blade. It is a 2nd graph which shows an experimental result when the electric wire which concerns on this embodiment is cut | disconnected with a rubbing blade. It is a graph which shows an experimental result when the electric wire which concerns on this embodiment is peeled.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating an electric wire according to an embodiment of the present invention. The electric wire 1 shown in the figure is composed of a conductor portion 10 made of a strand 11 in which metal plating 11b is applied on a high-strength fiber 11a and a covering portion 20 that covers the conductor portion 10.

  Here, the high-strength fibers 11a are aramid fibers, polyarylate fibers, PBO fibers, and the like. For example, copper and tin correspond to the metal plating 11b. Since the strand 11 which consists of such a high strength fiber 11a and the metal plating 11b uses a fiber, weight reduction can be achieved.

  In FIG. 1, the conductor portion 10 of the electric wire 1 is configured by twisting a plurality of strands 11, but the conductor portion 10 is not limited to a configuration in which a plurality of strands 11 are twisted, but is configured by a single wire. May be.

  FIG. 2 is a schematic view showing a state of cutting the electric wire 1 according to the present embodiment. As shown in FIG. 2, the rubbing blade 2 has, for example, two V-shaped blades 2a and 2b whose blade portions are V-shaped, and the V-shaped open sides of the V-shaped blades 2a and 2b are associated with each other. It is in a state. When the electric wire 1 is cut by the rubbing blade 2, the electric wire 1 is first installed between the V-shaped open sides of both the V-shaped blades 2a and 2b, that is, between the two V-shaped blades 2a and 2b. And the electric wire 1 is cut | disconnected by making V-shaped blade 2a, 2b mutually approach and cross | intersect.

  However, cutting with conventional wires may be difficult. FIG. 3 is a schematic diagram illustrating an example in which cutting is difficult. As shown in FIG. 3, when an electric wire using high-strength fibers 11 a for the strands 11 is to be cut by the rubbing blade 2, the high-strength fibers may enter between the rubbing blades 2. This makes cutting difficult.

  Therefore, in the electric wire 1 according to the present embodiment, the adhesion force between the conductor portion 10 and the covering portion 20 is 8N or more and less than the peelable adhesion force in the method for measuring the adhesion strength based on ISO6722.

  Here, when the adhesion force between the conductor portion 10 and the covering portion 20 is 8 N or more, the gap between the covering portion 10 and the conductor portion 20 is reduced when cutting with the rubbing blade, and the conductor portion 10 and the covering portion 20 are reduced. And the conductor part 10 and the covering part 20 are compounded, and the escape area of the conductor part 10 is lost, and the high-strength fibers 11a are difficult to enter between the rubbing blades 2. Thereby, the cutting can be facilitated.

  Further, since the adhesion force between the conductor portion 10 and the covering portion 20 is less than the peelable adhesion force, the adhesion force does not become too high, and a peeling defect (particularly, peeling of the plating) occurs, resulting in a defective wire. Can be prevented.

Here, the peelable adhesion force (N) is the peelable adhesion force (N) = 0.4 × the peeled area (mm ² ) = 0.4 × the conductor portion 10 and the covering portion 20 at the peeled portion. Contact area (mm ² ) = 0.4 × peeling length (mm) × contact distance (mm) at which the conductor portion 10 and the covering portion 20 contact each other in a substantially circular shape. In addition, the peeling length is determined to some extent according to the intended use of the electric wire.

  As described above, the electric wire 1 according to the present embodiment can facilitate the cutting by the rubbing blade 2 while reducing the weight.

  FIG. 4 is a first graph showing experimental results when the electric wire 1 according to the present embodiment is cut by the rubbing blade 2. In order to obtain the experimental results shown in FIG. 4, casting C370 (manufactured by Kodera Electronics Co., Ltd.) was used as the rubbing blade 2, and polypropylene was used as the covering portion 20 of the electric wire 1.

  As shown in FIG. 4, when an aramid fiber was used as the high-strength fiber 11a, the cutting success rate was 100% when the adhesion force between the conductor portion 10 and the covering portion 20 was about 5N or more. When polyarylate fibers and PBO fibers were used as the high-strength fibers 11a, the cutting success rate was 100% when the adhesion between the conductor portion 10 and the covering portion 20 was about 8N or more.

  FIG. 5 is a second graph showing experimental results when the electric wire 1 according to the present embodiment is cut by the rubbing blade 2. 5, hobbing scissors Alex 15132 (manufactured by Hayashi Knife Co., Ltd.) was used as the rubbing blade 2 and polypropylene was used as the covering portion 20 of the electric wire 1.

  As shown in FIG. 5, when an aramid fiber, a polyarylate fiber and a PBO fiber are used as the high-strength fiber 11a, in any case, when the adhesion force between the conductor portion 10 and the covering portion 20 is about 8N or more, the cut The success rate is 100%.

  As described above, although there are some differences depending on the fiber type, if the adhesion is 8N or more, the conductor portion 10 and the covering portion 20 are combined, and cutting is easy regardless of the thickness of the metal plating 11b. I found out that

  FIG. 6 is a graph showing experimental results when the electric wire 1 according to this embodiment is peeled. In the description of FIG. 6, the peeled state is bad means that the metal plating 11 b has been peeled off, and the peeled state is good even if the metal plating 11 b has not been peeled off or is peeled off. It means that it is very small.

As shown in FIG. 6, when the peeled area is about 47 mm ² , the peeled state is good when the adhesion is about 16 N, whereas the peeled state is poor when the adhesion is about 30 N. It became. When the peeled area was about 70 mm ² , the peeled state was good when the adhesion was about 20 N, whereas the peeled state was poor when the adhesion was about 40 N.

Similarly, when the peeled area was about 210 mm ² , the peeled state was good when the adhesion was about 75 N, whereas the peeled state was poor when the adhesion was about 100 N. When the peeled area was about 290 mm ² , the peeled state was good when the adhesion was about 110 N, whereas the peeled state was poor when the adhesion was about 125 N.

From the above, the peelable adhesion force is the peelable adhesion force (N) = 0.4 × the peeled area (mm ² ) = 0.4 × the contact area between the conductor portion 10 and the covering portion 20 at the peeled portion. It was found that (mm ² ) = 0.4 × peeling length (mm) × contact distance (mm) at which the conductor portion 10 and the covering portion 20 contact each other in a substantially circular shape. In addition, the difference by the difference in a fiber was not confirmed by the experimental result.

  Thus, according to the electric wire 1 which concerns on this embodiment, it is the electric wire 1 which made the strand 11 which gave the metal plating 11b on the high strength fiber 11a the conductor part 10, and covered the conductor part 10 with the coating | coated part 20. Therefore, it is possible to reduce the weight by using fibers. Moreover, in the measuring method of the contact | adhesion force based on ISO6722, the contact | adhesion power of the conductor part 10 and the coating | coated part 20 is 8N or more and below peelable contact | adhesion power. Here, since the adhesive force between the conductor portion 10 and the covering portion 20 is 8 N or more, the gap between the covering portion 20 and the conductor portion 10 is reduced in cutting with the rubbing blade, and the conductor portion 10 and the covering portion 20 are reduced. And the escape area of the conductor portion 10 is lost, and the high-strength fibers 11a are difficult to enter between the rubbing blades 2. Thereby, the cutting can be facilitated. Moreover, since the contact strength between the conductor portion 10 and the covering portion 20 is less than or equal to the peelable contact strength, the contact strength does not become too high, and a peeling failure occurs and the wire 1 becomes a defective product. Can be prevented. Accordingly, it is possible to facilitate the cutting with the rubbing blade while reducing the weight.

  As described above, the present invention has been described based on the embodiment, but the present invention is not limited to the above embodiment, and may be modified without departing from the gist of the present invention.

  For example, although the electric wire 1 which concerns on this embodiment twists the several strand 11 and makes it the conductor part 10, it is not restricted to this, The conductor part 10 may be a single wire.

  For example, the electric wire 1 according to the present embodiment may be used as the electric wire 1 that allows a weak current to flow because the allowable current may be smaller than that of an electric wire having pure copper as a conductor portion. You may use as the electric wire 1 which sends an electric current.

DESCRIPTION OF SYMBOLS 1 ... Electric wire 10 ... Conductor part 11 ... Elementary wire 11a ... High-strength fiber 11b ... Metal plating 20 ... Covering part

Claims (1)

An aramid fiber, a polyarylate fiber, or a PBO fiber is a wire that has been subjected to metal plating as a conductor part, and the conductor part is covered with a covering part,
In the method for measuring the adhesion force according to ISO 6722, the adhesion force between the conductor portion and the covering portion is 8 N or more, and the adhesion force per unit area is 0.4 N / mm ² or less. Electric wire to be used.

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