WO2021220532A1

WO2021220532A1 - Electric wire

Info

Publication number: WO2021220532A1
Application number: PCT/JP2020/041261
Authority: WO
Inventors: 篤子四野宮
Original assignee: 住友電気工業株式会社
Priority date: 2020-04-28
Filing date: 2020-11-04
Publication date: 2021-11-04
Also published as: JP2023076829A

Abstract

This electric wire has a conductor and an insulating layer covering the outer circumference of the conductor. The conductor has a first parent strand wire obtained by twisting together a plurality of first child strand wires, and a second parent strand wire including a plurality of second child strand wires twisted together on the outer circumference of the first parent strand wire. The first child strand wires are each formed by twisting together a plurality of first element wires, the second child strand wires are each formed by twisting together a plurality of second element wires, and the sum of a first ratio of the strand pitch of a second child strand wire to the outer diameter of the second child strand wire and a second ratio of the strand pitch of the second parent strand wire to the outer diameter of the conductor is 44.0 or less.

Description

Electrical wire

This disclosure relates to electric wires.

This application claims the priority based on Japanese Application No. 2020-079545 filed on April 28, 2020, and incorporates all the contents described in the Japanese application.

Insulated wires with an insulating layer on the outer circumference of conductors are widely used for wiring of vehicles such as automobiles and electrical / electronic equipment. As this conductor, a stranded conductor in which a plurality of strands are twisted may be used. Further, when the insulated wire is used as a high-voltage electric wire, a plurality of child-twisted wires obtained by child-twisting a plurality of strands may be used as the stranded conductor (for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2010-129405

The electric wire of the present disclosure includes a conductor and an insulating layer that covers the outer periphery of the conductor, and the conductor includes a first master stranded wire obtained by twisting a plurality of first child stranded wires and the first parent. It has a second master stranded wire including a plurality of second stranded wires twisted around the outer circumference of the stranded wire, and the first stranded wire is configured by twisting a plurality of first strands. The second child stranded wire is formed by twisting a plurality of second strands, and has the first ratio of the twist pitch of the second stranded wire to the outer diameter of the second stranded wire and the outer diameter of the conductor. The sum of the twist pitch of the second master stranded wire to the second ratio is 44.0 or less.

FIG. 1 is a cross-sectional view showing an electric wire according to an embodiment. FIG. 2 is a cross-sectional view showing a child stranded wire.

[Issues to be solved by this disclosure]
According to the electric wire described in Patent Document 1, although the intended purpose can be achieved, there is a possibility that the wire may come off when the insulating layer at the end of the electric wire is peeled off for connecting a connector or the like. Especially when the electric wire is short, there is a high possibility that the wire will come off.

The purpose of this disclosure is to provide an electric wire capable of suppressing the disconnection of a wire.

[Effect of the present disclosure]
According to the present disclosure, it is possible to suppress the omission of the wire.

The mode for implementation will be described below.

[Explanation of Embodiments of the present disclosure]
First, embodiments of the present disclosure will be listed and described.

[1] The electric wire according to one aspect of the present disclosure includes a conductor and an insulating layer that covers the outer periphery of the conductor, and the conductor is a first master twist obtained by twisting a plurality of first child stranded wires. It has a wire and a second master stranded wire including a plurality of second stranded wires twisted around the outer circumference of the first stranded wire, and the first stranded wire has a plurality of first strands. The second child stranded wire is composed by twisting a plurality of second strands, and the first ratio of the twist pitch of the second stranded wire to the outer diameter of the second stranded wire. The sum of the above and the second ratio of the twist pitch of the second master stranded wire to the outer diameter of the conductor is 44.0 or less.

As is clear from the experimental examples described later, the inventor of the present application may have different frequencies of wire loss even when the second ratios are equal, and even when the first ratios are equal, wire loss may occur. It was found that the frequency of occurrence may differ. That is, it may not be possible to sufficiently suppress the loss of the wire by simply lowering the second ratio, and it may not be possible to sufficiently suppress the loss of the wire by simply lowering the first ratio. On the other hand, if the sum of the first ratio and the second ratio is 44.0 or less, the omission of the wire can be sufficiently suppressed.

[2] In [1], the sum of the first ratio and the second ratio may be 30.0 or more and 44.0 or less. In this case, it is easy to secure characteristics such as bendability while sufficiently suppressing the disconnection of the wire. It is also possible to improve the productivity of electric wires.

[3] In [1] or [2], the sum of the first ratio, the second ratio, and the third ratio of the twist pitch of the first master stranded wire to the outer diameter of the first master stranded wire. May be 67.0 or less. In this case, it is easier to prevent the wire from coming off.

[4] In [3], the sum of the first ratio, the second ratio, and the third ratio may be 47.0 or more and 67.0 or less. In this case, it is easy to secure characteristics such as bendability while further suppressing the disconnection of the wire.

[5] In [1] to [4], the twist pitch of the second child stranded wire may be 40 mm or less. In this case, it is easier to prevent the wire from coming off.

[6] In [1] to [4], the twist pitch of the second child stranded wire may be more than 40 mm, and the outer diameter of the conductor may be 10.00 mm or more. In this case, it is easier to prevent the wire from coming off.

[7] In [1] to [6], the length may be 200 mm or less. Even if the length is 200 mm or less, the disconnection of the wire can be sufficiently suppressed.

[8] In [1] to [7], the outer diameter and twist pitch of the first stranded wire may be equal to the outer diameter and stranded pitch of the second stranded wire. In this case, it is easy to prepare the first stranded wire and the second stranded wire.

[9] In [1] to [8], the number of the first stranded wires may be seven, and the number of the second stranded wires may be twelve. In this case, for example, it can be used as a high-voltage electric wire for a vehicle.

[10] The electric wire according to another aspect of the present disclosure has a conductor and an insulating layer covering the outer periphery of the conductor, and the conductor has seven first child stranded wires twisted together. The first stranded wire has a first stranded wire and a second stranded wire including 12 second stranded wires twisted around the outer circumference of the first stranded wire, and the first stranded wire has a plurality of first stranded wires. The second conductor is composed of twisting one conductor, and the second conductor is composed of twisting a plurality of second conductors, and the twist pitch of the second conductor with respect to the outer diameter of the second conductor. The sum of the first ratio of the above and the second ratio of the twist pitch of the second master stranded wire to the outer diameter of the conductor is 30.0 or more and 44.0 or less, and the first ratio and the second ratio are The sum of the above and the third ratio of the twist pitch of the first master stranded conductor to the outer diameter of the first master stranded conductor is 47.0 or more and 67.0 or less, and the outer diameter of the first child stranded conductor and The twist pitch is equal to the outer diameter and twist pitch of the second child conductor.

The sum of the first ratio and the second ratio is 30.0 or more and 44.0 or less, and the sum of the first ratio, the second ratio and the third ratio is 47.0 or more and 67.0 or less. The line omission can be sufficiently suppressed.

[Details of Embodiments of the present disclosure]
Hereinafter, embodiments of the present disclosure will be described in detail, but the present embodiments are not limited thereto. In the present specification and the drawings, components having substantially the same functional configuration may be designated by the same reference numerals to omit duplicate explanations.

FIG. 1 is a cross-sectional view showing an electric wire according to an embodiment. The electric wire 1 according to the embodiment has a conductor 31 and an insulating layer 32 that covers the outer periphery of the conductor 31. FIG. 1 shows a cross section perpendicular to the longitudinal direction of the electric wire 1.

As shown in FIG. 1, the conductor 31 has a first master stranded wire 10 and a second master stranded wire 20. The first master stranded wire 10 is composed of a plurality of, for example, seven first child stranded wires 11 twisted together. The second master stranded wire 20 includes a plurality of, for example, twelve second stranded wires 21 twisted around the outer circumference of the first master stranded wire 10. The electric wire 1 can be used, for example, as a high-voltage electric wire for a vehicle.

The first child stranded wire 11 and the second child stranded wire 21 have the same configuration as each other. Hereinafter, the first child stranded wire 11 and the second child stranded wire 21 may be collectively referred to as a child stranded wire 41. FIG. 2 is a cross-sectional view showing the child stranded wire 41. Similar to FIG. 1, FIG. 2 shows a cross section perpendicular to the longitudinal direction of the electric wire 1.

As shown in FIG. 2, the child stranded wire 41 is configured by twisting a plurality of strands 42. For example, the diameter of the wire 42 is 0.10 mm or more and 0.60 mm or less, preferably 0.15 mm or more and 0.50 mm or less. For example, the number of strands 42 included in the child stranded wire 41 is 5 or more and 100 or less, preferably 9 or more and 91 or less. For example, the twist pitch P4 of the child stranded wire 41 is 15 mm or more and 100 mm or less, preferably 20 mm or more and 95 mm or less. For example, the outer diameter D4 of the child stranded wire 41 is 0.50 mm or more and 3.50 mm or less, preferably 0.90 mm or more and 3.30 mm or less. For example, the ratio R4 (= P4 / D4) of the twist pitch P4 of the child stranded wire 41 to the outer diameter D4 of the child stranded wire 41 is 18.0 or more and 35.0 or less, preferably 20.0 or more and 30.0. It is as follows. The strand 42 is an example of the first strand and the second strand. The ratio R4 in the second stranded wire 21 is an example of the first ratio. For example, the outer diameter and twist pitch of the first child stranded wire 11 are equal to the outer diameter and twist pitch of the second stranded wire 21, and the ratio R4 in the first stranded wire 11 is the ratio in the second stranded wire 21. Equal to R4. When the outer diameter and twist pitch of the first child stranded wire 11 are equal to the outer diameter and twist pitch of the second child stranded wire 21, the first child stranded wire 11 and the second child stranded wire 21 can be prepared in the same process.

The material of the wire 42 is not limited. Examples of the material of the wire 42 include annealed copper, tin-plated annealed copper, a copper alloy, aluminum, and an aluminum alloy.

As described above, it is configured by twisting a plurality of first child stranded wires 11. For example, the twist pitch P1 of the first master stranded wire 10 is 30 mm or more and 200 mm or less, preferably 45 mm or more and 170 mm or less. For example, the outer diameter D1 of the first master stranded wire 10 is 2.00 mm or more and 10.00 mm or less, preferably 2.80 mm or more and 9.20 mm or less. For example, the ratio R1 (= P1 / D1) of the twist pitch P1 of the first master stranded wire 10 to the outer diameter D1 of the first master stranded wire 10 is 10.0 or more and 30.0 or less, preferably 13.0. It is 27.0 or less. The ratio R1 is an example of the third ratio.

As described above, the second master stranded wire 20 includes a plurality of second stranded wires 21 twisted around the outer circumference of the first master stranded wire 10. For example, the twist pitch P2 of the second master stranded wire 20 is 30 mm or more and 250 mm or less, preferably 45 mm or more and 240 mm or less.

For example, the outer diameter D2 of the conductor 31 is 4.00 mm or more and 20.00 mm or less, preferably 4.70 mm or more and 16.00 mm or less. For example, the ratio R2 (= P2 / D2) of the twist pitch P2 of the second master stranded wire 20 to the outer diameter D2 of the conductor 31 is 8.0 or more and 20.0 or less, preferably 10.0 or more and 17.0. It is as follows. The ratio R2 is an example of the second ratio.

The material of the insulating layer 32 is not particularly limited. Examples of the material of the insulating layer 32 include cross-linked polyethylene. As the material of the insulating layer 32, vinyl chloride resin such as polyvinyl chloride, olefin resin such as polypropylene and propylene-ethylene copolymer, resin such as ethylene-propylene rubber and butadiene rubber, and metal hydrate (magnesium hydroxide) A composition obtained by adding a non-halogen flame retardant such as) or various additives may be used.

In this embodiment, the sum of the ratio R4 and the ratio R2 is 44.0 or less. The sum of the ratio R4 and the ratio R2 is preferably 30.0 or more and 44.0 or less. The sum of the ratio R4, the ratio R2, and the ratio R1 is preferably 67.0 or less, and more preferably 47.0 or more and 67.0 or less. The configuration may be different between the first stranded wire 11 and the second stranded wire 21, and in this case, it is preferable that these relationships hold for the second stranded wire 21.

The twisting direction of the child stranded wire 41, the first stranded wire 10 and the second stranded wire 20 is not limited. For example, a plurality of strands 42 are twisted to the right, a plurality of first strands 11 are twisted to the left, and a plurality of second strands 21 are twisted to the outer periphery of the first master strand 10. It may be twisted together.

The outer diameters of the child stranded wire 41, the first stranded wire 10 and the conductor 31 are measured as follows. That is, first, one plane perpendicular to the longitudinal direction of the object to be measured is arbitrarily specified. Next, three line segments that pass through the center of the object to be measured in the plane and intersect with the contour of the object to be measured are set as both end points and intersect with each other at an angle of 60 degrees. Then, the lengths of these three line segments are measured using a micrometer or a caliper, and the average value of the three line segments is used as the outer diameter of the object to be measured.

The twist pitch of the child stranded wire 41 is measured as follows. That is, first, the number A of the strands 42 exposed on the outer circumference of the child stranded wire 41 is counted in the circumferential direction. Next, one strand 42 as a reference is arbitrarily specified, and the child stranded wire 41 is applied to a long ruler. Then, in the longitudinal direction of the child stranded wire 41, the distance from the reference wire 42 to the “A + 1” th stranded wire 42 is measured, and this distance is taken as the twist pitch of the child stranded wire 41.

The twist pitch of the first master stranded wire 10 is measured as follows. That is, first, the number B of the first child stranded wire 11 exposed on the outer circumference of the first master stranded wire 10 is counted in the circumferential direction. Next, one first child stranded wire 11 as a reference is arbitrarily specified, and the first master stranded wire 10 is applied to a long ruler. Then, in the longitudinal direction of the first master stranded wire 10, the distance from the reference first stranded wire 11 to the "B + 1" th first stranded wire 11 is measured, and this distance is used as the first stranded wire 11. The twist pitch of the wire 10 is set.

The twist pitch of the second master stranded wire 20 is measured as follows. That is, first, the number C of the second child stranded wire 21 exposed on the outer periphery of the conductor 31 is counted in the circumferential direction. Next, one second child stranded wire 21 as a reference is arbitrarily specified, and the conductor 31 is applied to a long ruler. Then, in the longitudinal direction of the second master stranded wire 20, the distance from the reference second stranded wire 21 to the "C + 1" th second stranded wire 21 is measured, and this distance is used as the second master stranded wire 21. The twist pitch of the wire 20 is set.

As is clear from the experimental examples described later, even when the ratios R2 are equal, the frequency of omission of the strands 42 may be different, and even when the ratios R4 are equal, the frequency of omissions of the strands 42 is different. Sometimes. That is, it may not be possible to sufficiently suppress the omission of the wire 42 just by lowering the ratio R2, and it may not be possible to sufficiently suppress the omission of the wire 42 just by lowering the ratio R4. On the other hand, in the present embodiment, since the sum of the ratio R4 and the ratio R2 is 44.0 or less, the omission of the wire 42 can be sufficiently suppressed. When the sum of the ratio R4 and the ratio R2 is 30.0 or more and 44.0 or less, it is easy to secure characteristics such as bendability while sufficiently suppressing the disconnection of the wire 42.

When the sum of the ratio R4, the ratio R2 and the ratio R1 is 67.0 or less, it is easier to suppress the omission of the wire 42. Further, when the sum of the ratio R4, the ratio R2 and the ratio R1 is 47.0 or more and 67.0 or less, it is easy to secure characteristics such as bendability while further suppressing the disconnection of the wire 42.

When the twist pitch of the second child stranded wire 21 is 40 mm or less, it is easier to suppress the disconnection of the strand 42. Further, even if the twist pitch of the second child stranded wire 21 is more than 40 mm, if the outer diameter of the conductor 31 is 10.00 mm or more, it is easier to prevent the wire 42 from coming off.

The electric wire of the present disclosure is not limited to an insulated wire, but may be a shielded wire. For example, the diameter of the insulated wire may be 20 mm or less, and the diameter of the shielded wire may be 25 mm or less.

The length of the electric wire disclosed in this disclosure is not limited. For example, the length of the electric wire may be 70 mm or more and 5 m or less. Especially when the length is 200 mm or less, the effect of suppressing the disconnection of the wire 42 is remarkable.

Here, an experimental example will be described. In this experimental example, as in the electric wire 1 according to the embodiment, samples of various electric wires having a conductor including the first master stranded wire and the second master stranded wire and an insulating layer are prepared, and each sample is a strand. Evaluate the omission.

The conditions for each sample are shown in Tables 1 to 3. Table 1 shows the conditions for the child stranded wire in each sample. In this experimental example, it is assumed that the conditions of the first stranded wire and the conditions of the second stranded wire are the same in each sample. Table 2 shows the conditions for the first master stranded wire, the second master stranded wire and the conductor in each sample. Table 3 shows the conditions for the ratios R4, R2 and R1 in each sample.

Evaluation of missing wires is performed as follows. That is, first, a test electric wire having a length of 100 mm is cut out from the electric wire. Next, a notch is made in the insulating layer with a razor at a position 10 mm from both ends of the test wire. Then, the insulating layer on the end side of the notch is pulled out by hand. At this time, it is confirmed whether or not the wire is missing. It is assumed that when one or more strands move by 1 mm or more in the pulling direction, the strands are pulled out. Such an evaluation is performed 100 times for each sample. The results are shown in Table 3 together with the conditions for ratios R4, R2 and R1. The number of times the wire is missing in Table 3 indicates the number of times the wire is missing out of 100 evaluations.

As shown in Table 3, the sample No. in which the sum of the ratio R4 and the ratio R2 is 44.0 or less. 2-No. In 13, the number of omissions occurring in 100 evaluations is 1 or less. On the other hand, the sample No. in which the sum of the ratio R4 and the ratio R2 exceeds 44.0. In 1, the number of omissions in 100 evaluations reaches 13 times. As shown in Table 3, sample No. 2-No. In 13, the sum of the ratio R4 and the ratio R2 is 30.0 or more and 44.0 or less, and the sum of the ratio R4, the ratio R2 and the ratio R1 is 47.0 or more and 67.0 or less.

Although the embodiments have been described in detail above, the embodiments are not limited to the specific embodiments, and various modifications and changes can be made within the scope of the claims.

1: Electric wire 10: 1st stranded wire 11: 1st stranded wire 20: 2nd stranded wire 21: 2nd stranded wire 31: Conductor 32: Insulation layer 41: Child stranded wire 42: Wire

Claims

With the conductor
An insulating layer that covers the outer circumference of the conductor and
Have,
The conductor is
A first parent stranded wire obtained by twisting a plurality of first child stranded wires together,
A second master stranded wire containing a plurality of second child stranded wires twisted around the outer circumference of the first master stranded wire, and a second master stranded wire.
Have,
The first child stranded wire is composed of a plurality of first strands twisted together.
The second child stranded wire is composed of a plurality of second strands twisted together.
The sum of the first ratio of the twist pitch of the second strand to the outer diameter of the second strand and the second ratio of the twist pitch of the second master strand to the outer diameter of the conductor is 44. An electric wire that is 0 or less.
The electric wire according to claim 1, wherein the sum of the first ratio and the second ratio is 30.0 or more and 44.0 or less.
Claim 1 or claim that the sum of the first ratio, the second ratio, and the third ratio of the twist pitch of the first master stranded wire to the outer diameter of the first master stranded wire is 67.0 or less. Item 2. The electric wire according to item 2.
The electric wire according to claim 3, wherein the sum of the first ratio, the second ratio, and the third ratio is 47.0 or more and 67.0 or less.
The electric wire according to any one of claims 1 to 4, wherein the twist pitch of the second child stranded wire is 40 mm or less.
The twist pitch of the second child stranded wire is more than 40 mm.
The electric wire according to any one of claims 1 to 4, wherein the outer diameter of the conductor is 10.00 mm or more.
The electric wire according to any one of claims 1 to 6, which has a length of 200 mm or less.
The electric wire according to any one of claims 1 to 7, wherein the outer diameter and twist pitch of the first child stranded wire are equal to the outer diameter and twist pitch of the second stranded wire.
The number of the first child stranded wires is seven.
The electric wire according to any one of claims 1 to 8, wherein the number of the second stranded wires is 12.
With the conductor
An insulating layer that covers the outer circumference of the conductor and
Have,
The conductor is
The first master stranded wire, which is made by twisting seven first child stranded wires, and
A second master stranded wire containing twelve second child stranded wires twisted around the outer circumference of the first master stranded wire, and a second master stranded wire.
Have,
The first child stranded wire is composed of a plurality of first strands twisted together.
The second child stranded wire is composed of a plurality of second strands twisted together.
The sum of the first ratio of the twist pitch of the second strand to the outer diameter of the second strand and the second ratio of the twist pitch of the second master strand to the outer diameter of the conductor is 30. 0 or more and 44.0 or less,
The sum of the first ratio, the second ratio, and the third ratio of the twist pitch of the first master stranded wire to the outer diameter of the first master stranded wire is 47.0 or more and 67.0 or less.
An electric wire in which the outer diameter and twist pitch of the first child stranded wire are equal to the outer diameter and twist pitch of the second child stranded wire.