JP2020191222A - Twisted wire conductor, cable, cable with terminal, branched cable, cable with complementary line, branched cable with terminal and branched cable with complementary line - Google Patents

Abstract

To provide a twisted wire conductor having high connection reliability with a connection member even in a long term use, and also to provide a cable, a cable with a terminal, a branched cable, a cable with a complementary line, a branched cable with a terminal and a branched cable with a complementary line, using the same.SOLUTION: A twisted wire conductor 1 is formed by twisting a plurality of aluminum-based strands 121, 122 together into one or more layers. The twisted wire conductor includes a rough-surfaced area 2 having an arithmetical average height (Sa) of 0.4 to 500 μm, on a surface part of an outermost layer aluminum-based strand 121 located at an outermost layer forming an outer peripheral surface of a press-bonding part onto which a connection member is to be press-bonded.SELECTED DRAWING: Figure 1

Description

The present invention relates to a stranded conductor, and a covered electric wire, a covered electric wire with a terminal, a branch coated electric wire, a covered electric wire with an auxiliary wire, a branched covered electric wire with a terminal, and a branched covered electric wire with an auxiliary wire.

Aluminum or an aluminum alloy, which is lighter than copper, may be used instead of copper as a conductor for transmitting power. A twist formed by twisting aluminum-based wires made of a plurality of aluminums or aluminum alloys. Wire conductors are used.

In the electric wire 100 having such a stranded conductor, for example, as shown in FIG. 9, an insulating layer 102 is coated on the outer periphery of the stranded conductor 101, and a sheath 103 is coated on the outer periphery thereof. For example, in Patent Document 1, as a steel core aluminum stranded wire for reducing energization loss during power transmission, the aluminum wire of each layer other than the outermost layer is formed in a fan-shaped cross section, and the aluminum wire of the outermost layer is circular. The steel core aluminum stranded wire configured in the cross section is described.

JP-A-59-165306

The coated electric wire 100 having the stranded conductor has terminals at the end (see FIG. 9A) and the intermediate portion of the stranded conductor 101, which is exposed by peeling (peeling) the insulating layer 102 and the sheath 103. A connecting member (not shown) such as a connector or a connector is crimped and connected to an object to be connected via this connecting member.

However, since an inert film having a large electrical resistance is formed on the surface of a stranded conductor made of aluminum or an aluminum alloy, when the stranded conductor is connected to a connecting member such as a terminal or a connector, it becomes a connecting member. The electrical resistance at the connection with the stranded conductor may increase. In particular, the connection between the connecting member and the stranded conductor is generally crimped and fixed by caulking from the outer surface of the connecting member with the stranded conductor inserted, but the caulking process is insufficient. If present, most of the passivation film on the surface of the stranded conductor is not destroyed, and as a result, a large amount of passivation film remains in the connection portion, which tends to increase the electrical resistance in the connection portion.

Here, the steel core aluminum stranded wire described in Patent Document 1 increases the cross-sectional area by filling the internal space of the stranded conductor, but regarding the connection reliability between the stranded conductor and the connecting member, I'm not paying attention. Therefore, it has been required to develop a stranded conductor having high connection reliability between the stranded conductor and the connecting member.

An object of the present invention is a stranded conductor having high connection reliability with a connecting member even after long-term use, and a covered electric wire using the stranded conductor, a covered electric wire with a terminal, a branched covered electric wire, and a covering with an auxiliary wire. The present invention provides electric wires, branch-covered electric wires with terminals, and branch-covered electric wires with auxiliary wires.

The present inventors provide a roughened region in which the arithmetic mean height (Sa) is within a predetermined range on the surface portion of the outermost aluminum-based wire located in the outermost layer of the stranded conductor, and also provide a roughened surface. The connection reliability between the stranded conductor and the connecting member is configured so that the convex portion in the concave-convex shape constituting the chemical region is deformed when crimped with the connecting member such as a terminal or a connector. We have found that this can be enhanced, and based on this finding, we have completed the present invention.

That is, the gist structure of the present invention is as follows.
(1) In a stranded conductor formed by twisting a plurality of aluminum-based wires into a single layer or two or more layers, the stranded conductor forms an outer peripheral surface of a portion to be crimped to which a connecting member is crimped. A stranded conductor having a roughened region having an arithmetic mean height (Sa) of 0.4 μm or more and 500 μm or less on the surface portion of the outermost layer aluminum-based wire located in the outermost layer.
(2) The stranded conductor according to (1) above, wherein the roughened area is a range in which the longitudinal dimension of the stranded conductor is 10 mm or more and 200 mm or less.
(3) The twisted wire conductor according to (1) or (2) above, wherein the roughened surface region has a longitudinal dimension of the twisted wire conductor equal to or larger than the longitudinal dimension of the connecting member.
(4) The outermost aluminum-based wire is a round wire or a flat wire, and the ratio of the maximum wire diameter to the minimum wire diameter of the crimped portion is 1.1 or more and 2.0 or less on average. The stranded conductor according to (1), (2) or (3) above.
(5) The stranded conductor according to any one of (1) to (4) above, wherein the wire diameter of the outermost aluminum-based wire is in the range of 1.0 mm or more and 3.2 mm or less.
(6) The stranded conductor is formed by twisting two or more layers of the aluminum-based conductors, and the aluminum-based conductors located in the adjacent layers are in a direction in which the twisting directions intersect each other. The stranded conductor according to any one of (1) to (5) above, which has such an arrangement relationship.
(7) The stranded conductor according to any one of (1) to (6) above, and an insulating coating formed on the outer peripheral surface portion of the stranded conductor excluding the roughened region. Covered wire.
(8) A coated electric wire with a terminal having the coated electric wire according to (7) above and a terminal as the connecting member crimp-fixed to the roughened region formed at one end or both ends of the coated electric wire.
(9) The first coated electric wire which is the coated electric wire according to the above (7) as a trunk wire, the second coated electric wire which is another coated electric wire as a branch wire, and the rough surface formed on the first coated electric wire. A branch-coated electric wire having a first crimping portion crimp-fixed to the chemical region and a branch connector as the connecting member having a second crimping portion crimp-fixed to one of the peeled ends of the second coated electric wire.
(10) The first coated electric wire which is the coated electric wire according to the above (7), the third coated electric wire which is another coated electric wire which is an auxiliary wire extending the first coated electric wire, and the first coated electric wire. It has a third crimping portion formed at one end and crimp-fixed to the roughened region, and an extension connector as the connecting member having a fourth crimping portion crimp-fixed to the peeled end of the third coated electric wire. Covered wire with auxiliary wire.
(11) The first coated electric wire which is the coated electric wire according to the above (7), the second coated electric wire which is another coated electric wire as a branch line, and the roughened region formed on the first coated electric wire. A branch connector as a connecting member having a first crimping portion fixed by crimping and a second crimping portion crimped and fixed to a peeled end of the second coated electric wire, and the rough formed at one end of the first coated electric wire. A branch-coated electric wire with a terminal having a terminal as the connecting member fixed by crimping to a surfaced region.
(12) The first coated electric wire which is the coated electric wire according to the above (7), the second coated electric wire which is another coated electric wire as a branch wire, and the roughened region formed on the first coated electric wire. A branch connector as a connecting member having a first crimping portion fixed by crimping and a second crimping portion crimped and fixed to one end of the second coated electric wire, and a supplementary wire extending the first coated electric wire. A third coated electric wire, which is another coated electric wire, a third crimping portion formed by crimping and fixing to the roughened region formed at one end of the first coated electric wire, and crimping and fixing to the peeled end of the third coated electric wire. A branch-coated electric wire with a supplementary wire, which has an extension connector as the connection member having a fourth crimping portion.

According to the present invention, a roughened region having an arithmetic average height (Sa) within a predetermined range is provided on the surface portion of the outermost layer aluminum-based wire located in the outermost layer of the stranded conductor for a long period of time. Depending on the use, a stranded conductor with high connection reliability with the connecting member, and a coated wire using it, a coated wire with a terminal, a branch-coated wire, a coated wire with a supplementary wire, a branch-coated wire with a terminal, and a supplement. A branch coated wire with a wire can be provided.

An example of the configuration of a coated electric wire having a stranded conductor according to an embodiment of the present invention is shown, in which (a) is a front view and (b) is a coated electric wire shown in (a) cut on an I-I wire. It is a cross-sectional view at the time of. It is sectional drawing which shows the crimped part of the stranded conductor which concerns on embodiment of this invention, and shows the minimum wire diameter and the maximum wire diameter. It is a front view which shows an example of the twisting direction of the adjacent layer in the stranded conductor which concerns on embodiment of this invention, and (a) is the direction in which the twisting direction of the strands located in the adjacent layer intersect. In the case of reverse winding), (b) indicates a case where the twisting directions of the strands located in the adjacent layers are the same direction (parallel winding). It is a perspective view which shows an example of the main part structure of the coated electric wire with a terminal which concerns on embodiment of this invention. It is a perspective view which shows an example of the main part structure of the branched covered electric wire which concerns on embodiment of this invention. It is a perspective view which shows an example of the main part structure of the covered electric wire with auxiliary wire which concerns on embodiment of this invention. It is a perspective view which shows an example of the main part structure of the branch covered electric wire with a terminal which concerns on embodiment of this invention. It is a perspective view which shows an example of the main part structure of the branch covered electric wire with auxiliary wire which concerns on embodiment of this invention. An example of the configuration of a coated electric wire having a stranded conductor according to the prior art is shown, in which (a) is a front view and (b) is a coated electric wire shown in (a) when the coated electric wire is cut on the II-II wire. It is a sectional view.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments, and various modifications can be made without changing the gist of the present invention.

<Twisted conductor>
The stranded conductor of the present embodiment is a stranded conductor formed by twisting a plurality of aluminum-based wires into a single layer or two or more layers, and the stranded conductor is crimped to which a connecting member is crimped. An aluminum-based stranded conductor having a roughened region having an arithmetic mean height (Sa) of 0.4 μm or more and 500 μm or less on the surface portion of the outermost layer aluminum-based wire that forms the outer peripheral surface of the portion. Is.

In the aluminum-based stranded conductor according to the present embodiment, a roughened area having an arithmetic mean height (Sa) within a predetermined range is provided on the outer peripheral surface of the portion to be crimped, which is the portion where the connecting member is crimped. As a result, the convex part of the uneven shape that constitutes the roughened area is deformed by crimping with the connecting member such as terminals and connectors, and the deformed part does not come into contact with the atmosphere and becomes the connecting member. Since it is electrically connected, the connection reliability between the stranded conductor and the connecting member can be improved even after long-term use.

Hereinafter, embodiments of the present invention will be described in detail.

<Embodiment of stranded conductor>
1 (a) and 1 (b) show an example of the configuration of the coated electric wire 1 having the stranded conductor 10 according to the present embodiment, and FIG. 1 (a) is a front view and FIG. 1 (b). Is a cross-sectional view when the coated electric wire shown in FIG. 1A is cut on the I-I line. The stranded conductor 10 according to the present embodiment is formed by twisting a plurality of aluminum-based conductors into a single layer or two or more layers, and has a roughened surface region 2 at the end thereof. The coated electric wire 1 shown in FIG. 1 has a first layer (inner layer) so as to have a central wire 11 which is a central wire and two layers, a first layer and a second layer, around the center wire 11. The case where the stranded conductor 10 formed by twisting a plurality of aluminum-based wire 122 constituting a plurality of aluminum-based wire and a plurality of aluminum-based wire 121 forming a second layer (outermost layer) is shown is shown. Hereinafter, the coated electric wire 1 having the stranded conductor 10 having a two-layer stranded structure shown in FIG. 1 will be described as an example, but the present invention is not limited to such a configuration, and for example, the strands are made of a single layer or It may have a stranded conductor having a stranded structure of three or more layers.

Examples of the aluminum-based wire constituting the stranded conductor 10 include a wire made of pure aluminum or an aluminum alloy. Among these, as the aluminum alloy, aluminum-manganesium alloy, aluminum-magnesium alloy, aluminum-magnesium-silicon alloy, aluminum-zinc-magnesium alloy, aluminum-copper-magnesium alloy and the like can be used.

The aluminum-based wire is roughly classified into a central wire 11 as a center and an outer peripheral wire 12 formed by twisting a single layer or two or more layers around the center wire 11. Of these, the outer peripheral wire 12 is divided into an outermost aluminum wire 121 forming the outermost layer (second layer) and an inner aluminum wire 122 formed inside the outermost aluminum wire 121. be able to. For example, in the case of a stranded conductor having an n (n is an integer of 2 or more) layer twist structure, the outer peripheral wire 12 is the outermost aluminum-based wire 121 forming the outermost layer (nth layer) and the outermost aluminum-based wire. It can be divided into an inner layer aluminum-based wire 122 that constitutes a layer (n-1th layer) formed inside the wire 121.

Of these, the outermost layer aluminum-based wire 121 is the outer circumference of the crimped portion to which the connecting members such as the terminal 30 (see FIG. 4), the branch connector 41 (see FIG. 5), and the extension connector 52 (see FIG. 6) are crimped. It forms a surface, and has a roughened region 2 having an arithmetic mean height (Sa) of 0.4 μm or more and 500 μm or less on the surface portion including the portion to be crimped. By having the roughened region 2 having the arithmetic mean height (Sa) in such a numerical range, most of the convex portions in the concave-convex shape constituting the roughened region 2 are connected members ( (Not shown) deforms when crimping, and many of the deformed parts are electrically connected to the connecting member without contacting the atmosphere. Therefore, the outermost layer aluminum-based wire 121 and the connecting member after crimping The formation of a passivation film at the connecting portion between the wires is significantly suppressed, and the increase in electrical resistance between the stranded conductor 10 and the connecting member can be significantly suppressed.

Here, the arithmetic mean height (Sa) of the roughened region 2 of the outermost layer aluminum-based wire 121 constitutes the outer surface of the stranded conductor 10 of one of the outermost layer aluminum-based wires 121. It is the arithmetic mean height (Sa) of the roughened area 2 measured on the surface of the wire with a square area having a length of one-third of the wire diameter as one side as a reference plane. From the viewpoint of suppressing an increase in the electrical resistance between the stranded conductor 10 and the connecting member, the lower limit of the arithmetic mean height (Sa) is preferably 6.0 μm, more preferably 9.0 μm, and on the other hand, the arithmetic mean height. The upper limit of (Sa) is preferably 350 μm, more preferably 50 μm.

Further, in this roughened region 2, the longitudinal dimension Z, which is the dimension measured along the longitudinal direction X of the stranded conductor 10, suppresses an increase in electrical resistance for the entire connecting portion in contact with the connecting member. Therefore, it is preferable that the dimension is equal to or larger than the longitudinal dimension of the connecting member. Here, the longitudinal dimension of the connecting member is a dimension in the extending direction corresponding to the longitudinal dimension Z of the roughened region 2 of the stranded conductor 10. More specifically, the longitudinal dimension Z of the roughened region 2 is preferably in the range of, for example, 10 mm or more and 200 mm or less.

The outermost aluminum-based wire 121 can stably form a contact portion with a connecting member, and the stranded conductor 10 is easily bent. Therefore, a round wire having a circular cross section or a flat wire having an elliptical cross section can be used. It is preferable to have. In particular, when the stranded conductor 10 is a compressed stranded conductor formed by compression, the cross section of the outer peripheral wire 12, for example, the outermost aluminum-based wire 121, comes into contact with the connecting member as shown in FIG. It is preferable that the portion to be crimped is compressed, and the ratio of the maximum wire diameter L2 to the minimum wire diameter L1 of the crimped portion (before crimping) (maximum wire diameter L2 / minimum wire diameter L1) is for each wire. The arithmetic average is preferably 1.1 or more and 2.0 or less.

Here, with respect to the cross section of the outermost aluminum-based wire 121, the ratio of the maximum wire diameter L2 to the minimum wire diameter L1 of the portion to be crimped is set to the range of 1.1 or more and 2.0 or less on average, so that the outermost layer The contact area between the aluminum-based wire 121 and the connecting member is increased, and the above-mentioned arithmetic mean height (Sa) makes it possible to further establish an electrical connection between the stranded conductor 10 and the connecting member. The connection reliability with the member can be further improved.

The wire diameter of the outermost aluminum wire 121 is not particularly limited, but the lower limit thereof is preferably 1.0 mm, more preferably 1.5 mm, from the viewpoint of preventing disconnection due to wear of the outermost aluminum wire 121. preferable. On the other hand, the upper limit of the wire diameter of the outermost aluminum-based wire 121 is preferably 3.2 mm, more preferably 3.0 mm, and even more preferably 2.5 mm from the viewpoint of providing desired bending workability. Here, the wire diameter (wire diameter) of the aluminum-based wire whose cross section is not circular like a flat wire and the wire diameter of the outermost layer aluminum-based wire 121 in the compression stranded conductor are the cross sections of these wires. The diameters of perfect circles with the same cross-sectional area.

On the other hand, when the inner layer aluminum wire 122 is provided inside the outermost aluminum wire 121, the wire diameter of the inner aluminum wire 122 is preferably in the same range as that of the outermost aluminum wire 121. However, it may be different from or the same as the outermost layer aluminum-based wire 121.

The stranded conductor 10 according to the present embodiment preferably has one or more layers of inner layer aluminum-based wire 122, and in that case, the stranded conductor 10 is formed by twisting two or more layers of aluminum-based wire. .. At this time, the aluminum-based wires located in the layers adjacent to the inside and outside in the radial direction of the stranded conductor 10 (for example, the outermost layer aluminum-based wire 121 and the inner layer aluminum-based wire 122 in FIG. 1) are twisted to each other. It is preferable to have an arrangement relationship such that the directions intersect. At this time, by intersecting the twisting directions of the adjacent layers, among the adjacent layers, the grooves formed by the aluminum-based conductors constituting the inner layer (for example, the inner layer aluminum-based conductor 122 in FIG. 1) are formed. Since it is difficult for the aluminum-based wire constituting the outer layer (for example, the outermost layer aluminum-based wire 121 in FIG. 1) to enter, the stranded conductor 10 has a radial cross section closer to a circle, and is formed in the portion to be crimped. It is possible to obtain a stranded conductor 10 that is stably crimped to a connecting member. Further, by crossing the twisting directions of the adjacent layers, the aluminum-based strands constituting the outermost layer and the aluminum-based strands constituting the adjacent inner layer are arranged so as to make point contact with each other. As a result of the portions of the contacted wires rubbing against each other and the oxide film being easily destroyed, the connection stability can be improved.

Here, as an arrangement relationship such that the twisting directions intersect, aluminum-based strands located in adjacent layers, such as the stranded conductor 10a shown in FIG. 3A, for example, FIG. 3 It is preferable that the twisting directions of the outermost aluminum-based wire 121a and the inner-layer aluminum-based wire 122a of (a) intersect each other (reverse direction), but they are adjacent to each other. The twisting directions may be crossed by making a difference in strength between the twists of the aluminum-based conductors located in the layer.

Further, for example, like the stranded conductor 10b shown in FIG. 3 (b), the aluminum-based wires located in the adjacent layers, for example, the outermost layer aluminum-based wire 121b and the inner layer aluminum-based wire in FIG. 3 (b). The twisting directions of the wires 122b may be arranged in the same direction (substantially parallel directions) (parallel winding).

Although the central wire 11 constituting the stranded conductor 10 according to the present embodiment is composed of one wire in FIG. 1, a plurality of wires are replaced with the central wire 11. It may be composed of lines. In particular, when the central strand 11 is composed of a central stranded wire obtained by twisting a plurality of strands, the central stranded wire intersects with the strands located in the adjacent outer layers in twisting directions as described above. It is preferable to let it.

The method for producing the stranded conductor 10 according to the present embodiment is not particularly limited, but for example, aluminum-based conductors are twisted around the central strand 11 to form a single layer or two or more outer peripheral strands 12. After that, in the outermost layer aluminum-based wire 121, the roughened region 2 is manually formed by using a roughened member such as a stainless brush on the portion where the connecting member is crimped, that is, the crimped portion. The stranded conductor 10 can be manufactured by forming the roughening region 2 using a roughening machine provided with the roughening member.

Here, the arithmetic mean height (Sa) of the roughened region 2 can be adjusted to an appropriate value by adjusting the conditions for forming the roughened region 2. For example, when the roughened region 2 is formed by using a stainless steel brush, the wire diameter and wire density of the brush, and the load and the number of times when rubbing the outermost aluminum-based wire 121 can be adjusted.

Regarding the ratio of the maximum wire diameter to the minimum wire diameter in the cross section of the outermost layer aluminum-based wire 121, the flatness (flattening ratio) and shape of the aluminum-based wire and the twisted aluminum-based wire are compressed. By adjusting the stranded wire compression ratio when obtaining the stranded wire conductor 10, it can be adjusted to an appropriate value.

<Embodiment of coated electric wire>
As shown in FIG. 1, for example, the coated electric wire 1 according to the present embodiment includes the above-mentioned stranded conductor 10 and an insulating coating 13 formed on the outer peripheral surface portion of the stranded conductor 10 excluding the roughened region 2. Has. More specifically, it is possible that at least the insulating coating 13 is laminated on the outer periphery of the stranded conductor 10, and more preferably, the sheath 14 is laminated as the outermost layer on the outer periphery thereof.

Here, as the insulating coating 13, a known material can be used, and for example, polyolefins such as polyethylene and polypropylene, polyvinyl chloride, and the like can be used. Further, in order to prevent the insulating coating 13 from being damaged by the roughened region 2, the insulating coating 13 is preferably formed on the outer peripheral surface portion of the stranded conductor 10 excluding the roughened region 2.

<Embodiments of Covered Wire with Terminal, Branched Covered Wire, Covered Wire with Supplementary Wire>
In the covered electric wire 1 according to the present embodiment, it is preferable that connecting members such as terminals, branch connectors, and extension connectors are crimped to at least the roughened area 2, whereby the covered electric wire with terminals, the branched covered electric wire, and the auxiliary wire. It is preferable to form a covered electric wire.

(Coated wire with terminal)
Of these, the coated electric wire 3 with terminals has, for example, as shown in FIG. 4, the above-mentioned coated electric wire 1 and the terminal 30 crimp-fixed to the roughened region 2 formed at one end or both ends of the coated electric wire 1. ..

Here, the terminal 30 is a member made of pure aluminum or an aluminum alloy and having a tubular internal space 31 like the above-mentioned aluminum-based wire. The terminal 30 is caulked in a state where the roughened region 2 of the stranded conductor 10 of the coated electric wire 1 is inserted into the internal space 31, and the locking portion 32 formed by the caulking process is performed. The terminal 30 is crimped at the roughened region 2 of the coated electric wire 1.

(Branched covered wire)
As shown in FIG. 5, for example, the branch-coated electric wire 4 includes a first coated electric wire 1 which is the above-mentioned coated electric wire as a trunk line, a second coated electric wire 40 which is another coated electric wire as a branch line, and a branch connector 41. The first crimping portion 42 of the branch connector 41 crimps and fixes the roughened surface region 2 formed in the first coated electric wire 1, and the second crimping portion 43 of the branch connector 41 crimps and fixes the second coated electric wire. It is crimp-fixed to one end of 40 peeled skin.

Here, the conductor material of the second coated electric wire 40 may be made of pure aluminum or an aluminum alloy as in the above-mentioned aluminum-based wire, and the coated electric wire 1 may be made of copper or stainless steel (SUS). It may be made of a material different from the constituent material of the stranded conductor 10.

Further, the branch connector 41 is made of pure aluminum or an aluminum alloy like the above-mentioned aluminum-based wire, and has a first crimping portion 42 having a tubular internal space with both sides open and a tubular interior with one side open. It is a member having a second crimping portion 43 having a space. In this branch connector 41, the roughened region 2 of the stranded conductor 10 of the coated electric wire 1 is located in the first crimping portion 42, and the peeled end portion of the second coated electric wire 40 is the second crimping portion 43. The first crimping portion 42 is crimped and fixed to the roughened region 2 of the coated electric wire 1 and the second crimping portion 43 is crimped and fixed to the roughened area 2 of the coated electric wire 1 by being crushed while being inserted into the internal space of The branch-coated electric wire 4 can be obtained by crimping and fixing to one end of the peeled skin.

(Covered wire with auxiliary wire)
As shown in FIG. 6, for example, the covered electric wire 5 with an auxiliary wire has a first coated electric wire 1 which is the above-mentioned coated electric wire and a third coated electric wire which is another coated electric wire which is an extension of the first coated electric wire 1. An electric wire 50 and an extension connector 52 are provided, and the third crimping portion 53 of the extension connector 52 crimps and fixes the roughened area 2 formed on the first coated electric wire 1, and the fourth extension connector 52 is fixed. It can be obtained by crimping and fixing the third coated electric wire 50 to the peeled end end of the crimping portion 54.

Here, the conductor material of the third coated electric wire 50 is preferably a material that is less likely to form a passivation film having a larger electric resistance than the aluminum-based wire, and examples thereof include copper and stainless steel (SUS).

Further, the extension connector 52 is a member made of pure aluminum or an aluminum alloy like the above-mentioned aluminum-based wire, and has a third crimping portion 53 and a fourth crimping portion 54 having a tubular internal space. In this extension connector 52, the roughened region 2 of the stranded wire conductor 10 of the coated electric wire 1 is inserted into the third crimping portion 53, and the peeled end portion of the third coated electric wire 50 is the fourth crimping portion 54. It is crushed while being inserted into the internal space, whereby the third crimping portion 53 is crimped and fixed to the roughened region 2 of the coated electric wire 1, and the fourth crimping portion 54 is the skin of the third coated electric wire 50. By crimping and fixing to one end that has been peeled off, it is possible to obtain a coated electric wire 5 with a supplementary wire having an extended coated electric wire 1.

(Structure with multiple connecting members)
In the present embodiment, two or more of the terminal 30, the branch connector 41, and the extension connector 52 may be combined.

For example, as shown in FIG. 7, the first coated electric wire 1 which is the above-mentioned coated electric wire is used, the first coated electric wire 1, the second coated electric wire 40 which is another coated electric wire as a branch wire, and the branch connector 41. And, a branch-covered electric wire 6 with terminals provided with terminals 30 and 30'can be configured. In the branch-covered electric wire 6 with terminals, the roughened area 2 formed on the first coated electric wire 1 is crimp-fixed at the first crimping portion 42 of the branch connector 41, and the second crimping portion of the branch connector 41 is crimped. 43 is crimp-fixed to the peeled end of the second covered electric wire 40. On the other hand, a roughened region 2'is formed at one end of the first coated electric wire 1 described above, and the terminal 30 is crimp-fixed to the roughened region 2'. Further, a roughened area 2 ″ is formed at the other end of the first coated electric wire 1 described above, and the terminal 30 ″ is crimp-fixed to the roughened area 2 ″.

Further, as shown in FIG. 8, the first coated electric wire 1 which is the above-mentioned coated electric wire is used, the first coated electric wire 1, the second coated electric wire 40 which is another coated electric wire as a branch wire, and the branch connector 41. And a branch-coated electric wire 7 with an auxiliary wire, which is provided with the third coated electric wires 50 and 50', which are other auxiliary wires extending the first coated electric wire 1, and the extension connectors 52 and 52'. You can also do it. In the branch-covered electric wire 7 with a supplementary wire, the roughened area 2 formed on the first coated electric wire 1 is crimped and fixed at the first crimping portion 42 of the branch connector 41, and the second crimping of the branch connector 41 is performed. At the portion 43, one end of the second covered electric wire 40 is crimped and fixed. On the other hand, a roughened region 2'is formed at one end of the first coated electric wire 1 described above, and the roughened surface formed on the first coated electric wire 1 at the third crimping portion 53 of the extension connector 52. The region 2'is crimp-fixed, and one end of the third coated electric wire 50 is crimp-fixed to the fourth crimp portion 54 of the extension connector 52. Further, a roughened region 2 ″ is formed at the other end of the first coated electric wire 1 described above, and the rough surface roughened region 2 ″ is formed on the first coated electric wire 1 at the third crimping portion 53 ′ of the extension connector 52 ′. The surfaced region 2 ″ is crimp-fixed, and one end of the third coated electric wire 50 ′ is crimp-fixed to the fourth crimp portion 54 ′ of the extension connector 52 ′.

Next, examples of the present invention will be described, but the present invention is not limited to these examples as long as the gist of the present invention is not exceeded.

(1) Fabrication of Twisted Conductor [Example 1 of the present invention]
As the aluminum-based wire, 19 pure aluminum conductor wires made of material type A1070 of a round wire (wire flatness = 1) having a wire diameter of 2.6 mm were used, and as shown in FIG. 1 (b), one wire was used. 6 wires are twisted around the center wire to form an inner layer aluminum wire, and 12 wires are twisted around it to form an outermost aluminum wire, 1 + 6 + 12 A stranded conductor having a stranded structure of is produced. At this time, the outermost aluminum-based wire was twisted in the opposite direction to the adjacent inner-layer aluminum-based wire (reverse winding). A compressed stranded conductor was obtained by compressing the entire stranded conductor in the radial direction with a force having a compression ratio (twisted wire compression ratio) of 2%. The stranded wire cross-sectional area of the obtained compression stranded conductor is 100 mm ² . A coated electric wire was obtained by providing an insulating coating made of cross-linked polyethylene having a thickness of 2.0 mm and a sheath made of vinyl chloride having a thickness of 1.5 mm on the outer peripheral surface portion of the stranded conductor.

Peel off the range of 100 mm from the end of this coated wire, and use a stainless steel brush with a wire diameter of 0.1 mm and a wire density of 2 / mm ² to position it at the part where the roughened area of the stranded conductor is formed. By moving (rubbing) a stainless steel brush with a load of 1N applied to the outer peripheral surface of the outermost aluminum-based wire three times along the longitudinal direction X of the stranded conductor, the stranded conductor can be formed. A roughened region having a dimension Z of 100 mm along the longitudinal direction of the stranded conductor was formed on the surface portion of the outermost layer aluminum-based wire located in the outermost layer. Regarding the formed roughened region, using KEYENCE VK-X250, the surface of the wire forming the outer surface of the stranded conductor among one of the outermost aluminum-based wires is the wire of the wire. The arithmetic mean height (Sa) when a square region having a length of one-third of the diameter as one side as a reference plane was measured at a magnification of 400 times and found to be 0.4 μm.

In addition, the cross section of the outermost aluminum-based wire of the stranded conductor was observed using an inverted metallurgical microscope, and the ratio of the maximum wire diameter to the minimum wire diameter was obtained from the obtained image. The arithmetic mean for each wire was obtained. Was calculated as 1.1.

As aluminum-based terminals to be connected to the coated electric wire, surface coatings were formed on the inner and outer surfaces of the pure aluminum terminals by laminating a nickel layer having a thickness of 3 μm and a tin layer having a thickness of 10 μm, respectively, in the above order. Aluminum-based terminals were used. The longitudinal dimension of the conductor crimping portion of this aluminum terminal is 20 mm. The roughened area of the stranded conductor is inserted into the conductor crimping part of this aluminum terminal, and the size of the area where the surface reduction rate is 5 to 15% is 1 to 2 times the wire diameter of the stranded conductor. The stranded conductor was crimped to the aluminum terminal by caulking under such crimping conditions.

[Examples 2 to 20 of the present invention, Comparative Examples 1 and 2]
A coated electric wire having a compression stranded conductor in which a roughened region was formed was obtained in the same manner as in Example 1 of the present invention except that the conditions were adjusted based on the description in Table 1. Here, a wire having a flatness of 1 is a round line having a circular cross section, and a flat line having a flatness of more than 1 is a flat line having an elliptical cross section. Table 1 shows the measurement results of the arithmetic mean height (Sa) of the roughened region of the obtained compression stranded conductor and the average value of the ratio of the maximum wire diameter to the minimum wire diameter of the outermost aluminum wire. ..

(2) Evaluation of variations in resistance between the strands that make up the stranded conductor of the coated wire For the coated wire crimped to the aluminum-based terminal, the 200 mm coating is removed from the crimped portion to maintain crimping to the aluminum-based terminal. After untwisting the stranded conductor and separating each wire, the electrical resistance between all the wires and the aluminum terminals is set to a 4-terminal resistance using a 3560AC milliohm high tester (manufactured by HIOKI). It was measured by the measuring method, and the average value and standard deviation of the electric resistance value excluding the resistance value of the electric wire part were calculated from the measured electric resistance value and evaluated according to the following criteria. The results are shown in Table 2.

Here, if the standard deviation of the electrical resistance values between all the strands and the aluminum terminals is within 10% of the average value, it is judged that the connection reliability with the connecting member is excellent at the initial stage of use. “◎” indicates that the standard deviation of the electrical resistance between all the wires and the aluminum terminals is more than 10% and within 25% of the average value, and the connection reliability with the connecting member is good at the initial stage of use. It was judged to be present and marked as "○". On the other hand, if the standard deviation of the electrical resistance value between all the wires and the aluminum terminal is more than 25% of the average value, it is judged that the connection reliability with the connecting member is inferior (impossible) at the initial stage of use. It was set as "x".

(3) Evaluation of fluctuations in resistance value before and after the thermal shock test A coated wire crimped to an aluminum terminal is coated as a thermal shock test using a thermal shock device "TSE-11-A" manufactured by espec. The wire is moved from a box held at 0 ° C to a box held at 100 ° C to raise the temperature, then held at 100 ° C for 30 minutes, and then the covered wire is 0 from the box held at 100 ° C. After moving to a box held at ° C. and cooling, the coated electric wire was subjected to a thermal shock by performing 500 cycles with one cycle of holding at 0 ° C. for 30 minutes.

For coated wires before and after thermal shock, the 200 mm coating is removed from the part where the aluminum terminal is crimped, and the side where the aluminum terminal is not crimped out of the part where the coating is removed. About 30 mm was soldered. After that, the electric resistance value between the soldered part and the crimped part was measured by a 4-terminal resistance measuring method using a 3560AC milliohm high tester (manufactured by HIOKI), and from the measured electric resistance value, the stranded wire part The electrical resistance value excluding the resistance value was calculated and evaluated according to the following criteria. The results are shown in Table 2.

Here, if the resistance value after the thermal shock test is within 150% of the resistance value before the thermal shock test, it is determined that the connection reliability with the connecting member is excellent in long-term use. It was marked as "◎". Further, if the resistance value after the thermal shock test is within 200% of the resistance value before the thermal shock test, it is judged that the connection reliability with the connecting member is good in long-term use. It was marked as "○". On the other hand, if the resistance value after the thermal shock test is more than 200% of the resistance value before the thermal shock test, it is judged that the connection reliability with the connecting member is inferior (impossible) in long-term use. And made it "x".

(4) Evaluation method in comprehensive judgment The evaluation results regarding the variation in resistance between the strands and the comprehensive judgment based on the evaluation results regarding the variation in resistance value before and after the thermal shock test were judged according to the following evaluation criteria. The results are shown in Table 2.

Here, the evaluation result regarding the variation in resistance between the strands and the evaluation result regarding the variation in resistance value before and after the thermal shock test were both evaluated as "◎", and the connecting member can be used for a long period of time. It was judged that the connection reliability with was excellent, and it was marked as "◎". In addition, the evaluation results regarding the variation in resistance between the strands and the evaluation results regarding the variation in resistance value before and after the thermal shock test were both evaluated as "○", but they can be used as connecting members even after long-term use. It was judged that the connection reliability of was good, and it was marked with "○". On the other hand, at least one of the evaluation results regarding the variation in resistance between the strands and the evaluation result regarding the variation in resistance value before and after the thermal shock test was evaluated as "x" for at least a long period of time. It was judged that the connection reliability with the connecting member was inferior (impossible) in the wide range of use, and was marked with "x".

As is clear from Tables 1 and 2, the arithmetic mean height (Sa) is 0.4 μm or more and 500 μm on the surface portion of the outermost aluminum-based wire that forms the outer peripheral surface of the crimped portion to which the connecting member is crimped. In the stranded conductor having the following roughened regions (Examples 1 to 20 of the present invention), the evaluation result regarding the variation in resistance between the strands and the evaluation result regarding the variation in resistance value before and after the thermal shock test are both. Since the evaluation was "○" or higher, it was found that the connection reliability with the connecting member was good even after long-term use.

On the other hand, in the stranded conductor of Comparative Example 1 in which the arithmetic mean height (Sa) of the roughened region is as small as 0.1 μm, the evaluation result regarding the variation in resistance between the strands was “〇”, but the thermal The evaluation result regarding the fluctuation of the resistance value before and after the shock test was "x", and the connection reliability with the connecting member was inferior in long-term use. Further, in the stranded conductor of Comparative Example 2 in which the arithmetic mean height (Sa) of the roughened region is as large as 512 μm, the evaluation result regarding the variation in resistance between the strands and the variation in the resistance value before and after the thermal shock test are related. The evaluation results were all "x", and the connection reliability with the connecting member was inferior at the initial stage of use, and the connection reliability with the connecting member was inferior even after long-term use.

From the above results, the stranded conductors (Examples 1 to 20 of the present invention) having a roughened region having an arithmetic mean height (Sa) of 0.4 μm or more and 500 μm or less are compared with the stranded conductors of Comparative Examples 1 and 2. Therefore, it was found that the connection reliability with the connecting member was good even after long-term use.

1, 1a, 1b coated wire 2 Roughened area 3 Covered wire with terminal 4 Branch coated wire 5 Covered wire with auxiliary wire 6 Branch coated wire with terminal 7 Branch coated wire with auxiliary wire 10, 10a, 10b Stranded conductor 11 Center Wire 12 Outer wire 13 Insulation coating 14 Sheath 30 Terminal 31 Internal space 32 Locking part 40 Second coated wire 41 Branch connector 42 First crimping part 43 Second crimping part 50 Third coated wire 52 Extension connector 53 Third crimping Part 54 Fourth crimping part 121, 121a, 121b Outer layer aluminum-based wire 122, 122a, 122b Inner layer aluminum-based wire D Radial direction of stranded conductor X Longitudinal direction of stranded conductor Z Longitudinal dimension of roughened area L1 minimum wire diameter L2 maximum wire diameter

Claims (12)

In a stranded conductor formed by twisting a plurality of aluminum-based wires into a single layer or two or more layers.
The stranded conductor has an arithmetic mean height (Sa) of 0.4 μm or more on the surface portion of the outermost layer aluminum-based wire located in the outermost layer, which forms the outer peripheral surface of the crimped portion to which the connecting member is crimped. A stranded conductor having a roughened area of 500 μm or less. The stranded conductor according to claim 1, wherein the roughened region is a range in which the longitudinal dimension of the stranded conductor is 10 mm or more and 200 mm or less. The stranded conductor according to claim 1 or 2, wherein the roughened region has a longitudinal dimension of the stranded conductor equal to or greater than the longitudinal dimension of the connecting member. The outermost aluminum-based wire is a round wire or a flat wire, and the ratio of the maximum wire diameter to the minimum wire diameter of the crimped portion is 1.1 or more and 2.0 or less on average. The stranded conductor according to 2, or 3. The stranded conductor according to any one of claims 1 to 4, wherein the wire diameter of the outermost aluminum-based wire is in the range of 1.0 mm or more and 3.2 mm or less. The stranded conductor is formed by twisting the aluminum-based wire into two or more layers.
The stranded conductor according to any one of claims 1 to 5, wherein the aluminum-based conductors located in the adjacent layers have an arrangement relationship such that the twisting directions intersect each other. A coated electric wire having the stranded conductor according to any one of claims 1 to 6 and an insulating coating formed on an outer peripheral surface portion of the stranded conductor excluding the roughened region. The covered electric wire according to claim 7 and
A coated electric wire with a terminal having a terminal as the connecting member crimp-fixed to the roughened region formed at one end or both ends of the coated electric wire. The first coated electric wire, which is the coated electric wire according to claim 7, as a trunk line, and
The second coated wire, which is another covered wire as a branch wire,
A branch connector as a connecting member having a first crimping portion crimp-fixed to the roughened region formed on the first coated electric wire and a second crimping portion crimp-fixed to one peeled end of the second coated electric wire. A branch-covered electric wire having and. The first coated electric wire, which is the coated electric wire according to claim 7,
A third coated electric wire, which is another coated electric wire that is an auxiliary wire extending the first coated electric wire,
As the connecting member having a third crimping portion formed at one end of the first coated electric wire and crimp-fixed to the roughened region, and a fourth crimping portion crimp-fixed to the peeled end of the third coated electric wire. Covered wire with auxiliary wire having an extension connector. The first coated electric wire, which is the coated electric wire according to claim 7,
The second coated wire, which is another covered wire as a branch wire,
A branch connector as a connecting member having a first crimping portion crimp-fixed to the roughened region formed on the first coated electric wire and a second crimping portion crimp-fixed to one peeled end of the second coated electric wire. When,
A branch-covered electric wire with a terminal having a terminal as the connecting member crimp-fixed to the roughened region formed at one end of the first covered electric wire. The first coated electric wire, which is the coated electric wire according to claim 7,
The second coated wire, which is another covered wire as a branch wire,
A branch connector as a connecting member having a first crimping portion crimp-fixed to the roughened region formed on the first coated electric wire and a second crimping portion crimp-fixed to one peeled end of the second coated electric wire. When,
A third coated electric wire, which is another coated electric wire that is an auxiliary wire extending the first coated electric wire,
As the connecting member having a third crimping portion formed at one end of the first coated electric wire and crimp-fixed to the roughened region, and a fourth crimping portion crimp-fixed to the peeled end of the third coated electric wire. Branched covered wire with auxiliary wire having an extension connector.

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