JP2017168316A - Insulated wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insulated wire with an over-current cut-off function, capable of being joined to a component without using a crimp terminal.SOLUTION: An insulated wire 1 includes a fusible conductor 2 blown by overcurrent, and an insulator 3 covering the outer periphery of the fusible conductor 2. The fusible conductor 2 comprises a Zn-Al-based alloy. The Zn-Al-based alloy contains at least one selected from the group consisting of P, Bi, and Ag. Each content of P, Bi, and Ag may be within a range of 0.01 mass% or more and 1 mass% or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an insulated wire.

  2. Description of the Related Art Conventionally, an insulated wire with an overcurrent blocking function is known that has a soluble conductor that is melted by an overcurrent and an insulator that covers the outer periphery of the soluble conductor.

  For example, Patent Document 1 discloses an electric wire with an overcurrent interruption function, in which a conductor made of a metal having a melting point of 700 ° C. or less is covered with an insulating coating, and the conductor is melted by overcurrent. In the same document, a Zn—Al alloy or the like is disclosed as a conductor.

JP 2014-63639 A

  The electrical connection between the above-described insulated wire with an overcurrent cutoff function and the component is usually performed via a crimp terminal crimped to a soluble conductor. However, an insulated wire with an overcurrent cutoff function is short in actual use. Therefore, a sufficient space cannot be secured when crimping the terminals, and the crimping operation is difficult. Further, a soluble conductor made of a Zn—Al alloy has poor wettability. Therefore, a soluble conductor made of a Zn—Al alloy is difficult to solder and is difficult to join with other metals. Therefore, the present situation is that an insulated wire with an overcurrent blocking function having a soluble conductor made of a Zn—Al alloy must employ electrical connection by a difficult crimping operation.

  This invention is made | formed in view of the said background, and it aims at providing the insulated wire with an overcurrent interruption | blocking function which can be joined to components, without using a crimp terminal.

One aspect of the present invention is a soluble conductor that is melted by overcurrent;
An insulating wire covering an outer periphery of the soluble conductor,
The soluble conductor is made of a Zn-Al alloy,
The Zn—Al-based alloy is in an insulated wire containing at least one selected from the group consisting of P, Bi, and Ag.

  As for the said insulated wire, the soluble conductor is comprised from the Zn-Al type alloy. The Zn—Al-based alloy contains at least one selected from the group consisting of P, Bi, and Ag. Therefore, the wettability of the Zn—Al-based alloy is improved by the action of P, Bi, or Ag. That is, by heating the fusible conductor, the fusible conductor itself gets wet like solder and can be joined to the metal portion at the joint location of the component. This is because P, Bi, or Ag is more easily oxidized than Zn or Al, and reduces the metal part in the component, so that the surface tension of the metal part is reduced, the wettability is improved, and the bonding strength is increased. This is thought to be due to improvement. Therefore, according to the said insulated wire, the crimp terminal conventionally required for the electrical connection with components becomes unnecessary.

1 is a cross-sectional view of an insulated wire of Example 1. FIG.

  The said insulated wire has the soluble conductor melted | fused by overcurrent, and the insulator which coat | covers the outer periphery of a soluble conductor.

  In the above insulated wire, the fusible conductor is made of a Zn—Al-based alloy. Here, the Zn—Al-based alloy contains at least one selected from the group consisting of P, Bi, and Ag. The Zn-Al-based alloy may contain any one of P, Bi, and Ag, and any combination of P and Bi, Bi and Ag, Ag and P, P, Bi, and Ag. You may contain.

  The Zn—Al-based alloy can contain 0.01 mass% or more and 1 mass% or less of P. In this case, it is possible to obtain an insulated wire with an overcurrent cutoff function that is low in cost and has a great effect of improving the wettability of a soluble conductor and has excellent bondability with components.

  The P content is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, and still more preferably 0.1% by mass or more from the viewpoint of easily ensuring the wettability improvement effect of the soluble conductor. It can be 3 mass% or more. The P content is preferably 0.9% by mass or less, more preferably 0.8% by mass or less, and still more preferably 0.7% by mass, from the viewpoint of easily suppressing generation of voids due to oxides. % Or less.

  The Zn—Al-based alloy can contain Bi in an amount of 0.01% by mass to 1% by mass. In this case, although not as much as P, the effect of improving the wettability of the fusible conductor is great, and an insulated wire with an overcurrent cutoff function that has good bondability with components can be obtained.

  The Bi content is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, and still more preferably 0.1% by mass or more from the viewpoint of easily ensuring the effect of improving the wettability of the soluble conductor. It can be 3 mass% or more. In addition, the Bi content is preferably 0.9% by mass or less, more preferably 0.8% by mass or less, and still more preferably 0% from the viewpoint of cost reduction and easy generation of voids due to oxides. .7% by mass or less.

  The Zn—Al-based alloy can contain 0.01% by mass or more and 1% by mass or less of Ag. In this case, although not as much as P, the effect of improving the wettability of the fusible conductor is great, and an insulated wire with an overcurrent cutoff function that has good bondability with components can be obtained.

  The Ag content is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, and still more preferably 0.1% by mass or more from the viewpoint of easily ensuring the effect of improving the wettability of the soluble conductor. It can be 3 mass% or more. The Ag content is preferably 0.9% by mass or less, more preferably 0.8% by mass or less, and still more preferably 0% from the viewpoints of cost reduction and easy suppression of void generation due to oxides. .7% by mass or less.

  The Zn—Al-based alloy can contain 5% by mass or more and 15% by mass or less of Al. In this case, an insulated wire with an overcurrent cutoff function that is advantageous for improving the strength of the fusible conductor and improving the wire drawing workability can be obtained.

  The Al content is preferably 5.2% by mass or more, more preferably 5.5% by mass or more, and still more preferably 6% by mass from the viewpoint of easily ensuring the effect of improving the strength of the soluble conductor. This can be done. Further, the Al content is preferably 13% by mass or less, more preferably 10% by mass from the viewpoints of ensuring the toughness of the soluble conductor, improving the wire drawing workability, and suppressing the decrease in bondability due to an increase in the melting point. It can be as follows.

  Specifically, the Zn—Al-based alloy contains Al: 5% by mass to 15% by mass, P: 0.01% by mass to 1% by mass, and the balance is made of Zn and inevitable impurities. Al: 5 mass% or more and 15 mass% or less, Bi: 0.01 mass% or more and 1 mass% or less, the remainder consisting of Zn and inevitable impurities, Al: 5 mass% or more and 15 mass% or less, Ag : 0.01 mass% or more and 1 mass% or less, The remainder can be set as the structure which consists of Zn and an unavoidable impurity.

The cross-sectional area of the fusible conductor is preferably 0.5 mm ² or less, more preferably 0.35 mm ² or less, from the viewpoint of easy design so as to blow at a predetermined current value (overcurrent). Can do. Here, the cross-sectional area of the fusible conductor, in order to ensure adequate bonding between the components, preferably, 0.13 mm ² or more, more preferably, may be 0.22 mm ² or more.

  In the insulated wire, examples of the insulator material include vinyl chloride resins, silane cross-linked resins, olefin resins, engineering plastics, and the like.

  The said insulated wire can be used suitably for vehicles. Specifically, for example, the insulated wire can be applied to a vehicle higher harness. Examples of the vehicle include an automobile, a train, a train, and a motorcycle.

  Moreover, as a part to which the soluble conductor of the insulated wire is directly electrically connected without using a crimp terminal, a bus bar or the like can be specifically exemplified.

  In addition, each structure mentioned above can be arbitrarily combined as needed, in order to acquire each effect etc. which were mentioned above.

  Hereinafter, the insulated wire of an Example is demonstrated using drawing.

Example 1
The insulated wire of Example 1 is demonstrated using FIG. As shown in FIG. 1, the insulated wire 1 of this example includes a soluble conductor 2 that is blown by an overcurrent and an insulator 3 that covers the outer periphery of the soluble conductor 2.

  The fusible conductor 2 is made of a Zn—Al-based alloy. The Zn—Al alloy contains at least one selected from the group consisting of P, Bi, and Ag.

  In this example, the soluble conductor 2 is composed of a plurality of soluble conductor strands 20 twisted together. A gap 4 is formed between the outer peripheral surface of the soluble conductor 2 and the inner peripheral surface of the insulator 3. Due to the gap 4, the soluble conductor 2 is easily deformed when the soluble conductor 2 is melted by an overcurrent, and the soluble conductor 2 is easily cut at the melted portion. That is, the fusible conductor 2 is easy to interrupt the circuit.

<Experimental example>
Hereinafter, it demonstrates more concretely using an experiment example.

(Production of insulated wires)
An alloy having a predetermined chemical component shown in Table 1 described later was drawn to a diameter φ = 0.3 mm to obtain a soluble conductor strand. By twisting seven of the obtained soluble conductor strands at a predetermined twist pitch, a soluble conductor composed of a stranded conductor was obtained. A vinyl chloride resin was extruded and coated on the outer periphery of the obtained soluble conductor with a coating thickness of 0.3 mm to form an insulator. Thereby, the insulated wire with an overcurrent interruption function of each sample was produced.

(Jointness evaluation)
The insulator in the terminal part of the insulated wire of the obtained sample was peeled 10 mm. Next, the tip of the exposed conductor was heated and melted in the manner of soldering, and joined to a copper plate. Each end of the copper plate and the insulated wire opposite to the joint was fixed to a tensile tester, the joint was pulled at a tensile speed of 50 mm / min, and the breaking strength of the joint was measured. In addition, a copper plate simulates the metal site | part with which the components to which an insulated wire is electrically connected are provided. The case where the breaking strength of the joint was 60 N or more was designated as “A” because the jointability was excellent. The case where the breaking strength of the joint was 50N or more and less than 60N was regarded as “B” because the jointability was good. When the breaking strength of the joint portion was less than 50 N, joining was impossible, and “C” was assumed because electrical connection with a crimp terminal was unavoidable.

  The evaluation results of the alloy composition and bondability of the soluble conductor in each sample are shown together.

  According to Table 1, the following can be understood. In each of the insulated wires of Sample 1C and Sample 2C, the soluble conductor is made of a Zn—Al alloy and does not contain at least one selected from the group consisting of P, Bi, and Ag. Therefore, although the insulated wires of Sample 1C and Sample 2C can exhibit an overcurrent cutoff function, the wettability of the soluble conductor is poor, and electrical connection with a crimp terminal is essential.

  On the other hand, in the insulated wires of Samples 1 to 6, the soluble conductor is made of a Zn—Al-based alloy. The Zn—Al-based alloy contains at least one selected from the group consisting of P, Bi, and Ag. Therefore, the wettability of the Zn—Al based alloy was improved by the action of P, Bi, or Ag, and a high bonding strength with the copper plate was obtained. According to the insulated wires of Sample 1 to Sample 6, it was confirmed that the electrical connection with the component can be performed without using the crimp terminal.

  As mentioned above, although the Example of this invention was described in detail, this invention is not limited to the said Example, A various change is possible within the range which does not impair the meaning of this invention.

DESCRIPTION OF SYMBOLS 1 Insulated electric wire 2 Soluble conductor 20 Soluble conductor strand 3 Insulator

Claims (5)

A fusible conductor that melts due to overcurrent;
An insulating wire covering an outer periphery of the soluble conductor,
The soluble conductor is made of a Zn-Al alloy,
The Zn-Al-based alloy is an insulated wire containing at least one selected from the group consisting of P, Bi, and Ag.   The insulated wire according to claim 1, wherein the Zn-Al-based alloy contains P in an amount of 0.01% by mass to 1% by mass.   The insulated wire according to claim 1, wherein the Zn-Al-based alloy contains Bi in an amount of 0.01 mass% to 1 mass%.   The insulated wire according to claim 1, wherein the Zn-Al-based alloy contains 0.01 mass% or more and 1 mass% or less of Ag.   The insulated wire according to any one of claims 1 to 4, wherein the Zn-Al alloy contains 5 mass% or more and 15 mass% or less of Al.

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