JP7272885B2 - Wires with terminals, crimp terminals and wires - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electric wire with a terminal, a crimp terminal, and an electric wire.

Conventionally, as a terminal metal fitting, one that is fit-connected to a mating terminal metal fitting is known. This type of terminal fitting improves the contact reliability between its own contact and the contact of the mating terminal fitting, thereby enhancing the quality of current flow with the mating terminal fitting. For example, in order to realize such an object, the contact of the terminal fitting is provided with graphene to improve the reliability of contact with the contact of the mating terminal fitting (Patent Document 1 below).

JP 2018-56119 A

By the way, the terminal fitting is physically and electrically connected to the end of the electric wire, thereby electrically connecting the end of the electric wire, for example, an electric device and the counterpart terminal fitting. For example, a terminal fitting forming a crimp terminal is crimped onto an exposed core wire at the end of an electric wire. Therefore, it is desirable that this terminal fitting is improved not only in contact reliability between contacts but also in contact reliability with the core wire of the end of the electric wire.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an electric wire with a terminal, a crimp terminal, and an electric wire that can improve the contact reliability between the terminal fitting and the electric wire.

In order to achieve the above object, the electric wire with a terminal according to the present invention includes an electric wire, a terminal fitting having a crimped wire crimped body crimped to an exposed core wire exposed portion of a core wire at an end of the electric wire, the exposed core portion and the and a plurality of graphenes interposed between the crimped electric wire and the crimped electric wire, wherein the serration is formed with at least one of a plurality of recesses and a plurality of protrusions, and the core wire is exposed in the serration. and a core wire holding region for holding the core wire portion, and the graphene is interposed between the core wire exposed portion and the core wire holding region.

Here, the graphene is desirably a fractured graphene body obtained by breaking a molded graphene compact .

Further, in order to achieve the above object, the electric wire with a terminal according to the present invention comprises an electric wire, a terminal fitting having an electric wire crimped body crimped to an exposed core wire exposed portion of a core wire at an end of the electric wire, and the core wire exposed portion. and a plurality of graphenes interposed between the wire crimped body, wherein the graphene is a broken graphene body obtained by breaking a formed graphene compact.

Further, the graphene molded body is formed such that a part or all of a region thereof is broken by a pressure applied when the electric wire crimping body is crimped to the core wire exposed portion, and the core wire exposed portion before crimping is broken. It is desirable to interpose between the wire crimping body.

In addition, it is preferable that the graphene molded body is a graphene film formed on either one of the core wire exposed portion before crimping and the wire crimped body.

In order to achieve the above object, a crimp terminal according to the present invention is interposed between a terminal fitting having a wire crimping body to be crimped to an exposed core wire exposed portion of a core wire at an end of an electric wire and the exposed core wire portion. and a graphene molded body provided on the electric wire crimped body for the purpose thereof, wherein the graphene molded body is partially or entirely broken by the pressure applied when the electric wire crimped body is crimped to the core wire exposed portion. It is characterized by being formed as

Further, in order to achieve the above object, the electric wire according to the present invention includes a conductive core wire, an insulating coating covering the outer periphery of the core wire, and graphene provided on the outer periphery of the bare core wire exposed portion of the core wire at the terminal. and a molded body, wherein the graphene molded body is formed such that a part or all of a region thereof is broken by a pressure applied when the wire crimping body of the terminal fitting is crimped to the core wire exposed portion. and

In the electric wire with a terminal according to the present invention, since a plurality of graphenes are interposed between the core wire exposed portion and the electric wire crimped body, the contact reliability between them can be improved, and the quality of current flow between them can be improved. can be done. Further, in the crimp terminal and the electric wire according to the present invention, the graphene molded body is broken by crimping the electric wire crimped body to the core wire exposed part, and a plurality of graphenes (graphene broken body ), the contact reliability therebetween can be improved, and the energization quality therebetween can be improved.

FIG. 1 is a perspective view showing an electric wire with terminal according to an embodiment. FIG. 2 is a cross-sectional view taken along the line XX of FIG. 1, and is an enlarged view of the core wire crimping portion of the electric wire crimping body and its surroundings. FIG. 3 is a perspective view partially showing the crimp terminal of the embodiment. FIG. 4 is a plan view partially showing the crimp terminal of the embodiment. FIG. 5 is a perspective view showing the terminal of the electric wire of the embodiment.

EMBODIMENT OF THE INVENTION Below, embodiment of the electric wire with a terminal which concerns on this invention, a crimp terminal, and an electric wire is described in detail based on drawing. In addition, this invention is not limited by this embodiment.

[Embodiment]
One embodiment of an electric wire with a terminal, a crimp terminal, and an electric wire according to the present invention will be described with reference to FIGS. 1 to 5. FIG.

Reference character Wt in FIG. 1 indicates the terminal-equipped electric wire of the present embodiment. Moreover, the code|symbol We of FIG. 1 shows the electric wire of this embodiment. Moreover, the code|symbol 10 of FIG. 1 shows the crimp terminal of this embodiment.

An electric wire Wt with a terminal includes an electric wire We and a terminal fitting 20 (FIGS. 1 and 2). Furthermore, this terminal-equipped wire Wt includes a plurality of graphenes 31 (FIG. 2).

The electric wire We includes a conductive core wire We1 and an insulating coating We2 that covers the outer circumference of the core wire We1 (FIGS. 1 and 2). At the end of the electric wire We, the covering We2 is stripped off and the core wire We1 is exposed. The core wire We1 may be a bundle of a plurality of strands made of a conductive metal wire, or may be a rod-shaped conductor formed into a cylindrical shape.

The terminal fitting 20 is molded from a conductive material such as metal. For example, this terminal fitting 20 is made of copper, a copper alloy, aluminum, an aluminum alloy, or the like. The terminal fitting 20 includes a terminal connector 21 physically and electrically connected to a mating terminal connector (not shown) of the mating terminal fitting, and an exposed core wire portion We1a of the core wire We1 at the end of the electric wire We. and a wire crimping body 22 to be crimped to (FIG. 1).

One of the terminal connector 21 and the mating terminal connector is shaped like a female terminal, and the other is shaped like a male terminal. In this illustration, the terminal connector 21 is formed in the shape of a female terminal.

The electric wire crimping body 22 has a core wire crimping portion 23 to be crimped to the exposed core portion We1a, and a covering crimping portion 24 to be crimped to the covering We2 of the end of the electric wire We (FIG. 1). The core wire crimping portion 23 has a pair of cantilevered first barrel pieces 23a wound around the core wire exposed portion We1a and crimped by crimping. The core wire crimping portion 23 may crimp the pair of first barrel pieces 23a in any form such as so-called B crimp or overlap crimp. In addition, the covering crimping portion 24 has a pair of cantilevered second barrel pieces 24a which are wound around the covering We2 of the end of the electric wire We and crimped by crimping. The covering crimp portion 24 may crimp the pair of second barrel pieces 24a in any form, such as so-called B crimp or overlap crimp. The wire crimping body 22 has a pair of cantilevered barrel pieces (not shown) to be crimped to the core wire exposed portion We1a at the end of the wire We and the coating We2. It may be of such a shape that is connected in a row.

The core wire crimping portion 23 is provided with a core wire holding area 25 for holding the crimped core wire exposed portion We1a on its inner wall surface (wall surface on the side covering the core wire exposed portion We1a) (FIGS. 3 and 4). . The core wire holding area 25 is formed with serrations 25a comprising at least one of a plurality of concave portions and a plurality of convex portions, and the core wire exposed portion We1a is held by the plurality of serrations 25a. In the core wire holding region 25, the contact area between the core wire crimping portion 23 and the core wire exposed portion We1a is increased by the plurality of serrations 25a, thereby increasing the adhesion strength therebetween and improving the contact reliability. An electrical connection state can be improved. Therefore, the core wire holding area 25 may be provided at least in a portion of the inner wall surface of the core wire crimping portion 23 that directly covers the exposed core portion We1a. For example, when the core wire crimping portion 23 has an overlap crimp configuration, the core wire holding region 25 does not necessarily need to be provided in the portion of the other first barrel piece 23a that covers the one first barrel piece 23a. The core wire holding area 25 in this example is composed of a plurality of circular concave serrations 25 a formed over substantially the entire inner wall surface of the core wire crimping portion 23 .

In this terminal-equipped electric wire Wt, a plurality of graphenes 31 are interposed between the core wire exposed portion We1a and the core wire crimping portion 23 of the wire crimping body 22 (FIG. 2). Each graphene 31 has conductivity, and between the exposed core portion We1a and the crimped core portion 23 in the crimped state, for example, it bites into each of the exposed core portion We1a and the crimped core portion 23. It is possible to improve the contact reliability while increasing the holding force therebetween. Therefore, in this electric wire Wt with a terminal, by interposing a plurality of graphenes 31 between the crimped core wire exposed portion We1a and the core wire crimped portion 23, it is possible to improve the conduction quality therebetween. Each graphene 31 is interposed between the core wire exposed portion We1a in the crimped state and the core wire crimped portion 23, but since it has conductivity, it is possible to suppress an increase in resistance therebetween. can. Therefore, this electric wire Wt with a terminal can improve the electric conduction quality between the core wire exposure part We1a and the core wire crimping part 23 also from this point.

Furthermore, in this electric wire Wt with a terminal, each graphene 31 is preferably interposed between the core wire exposed portion We1a and the core wire holding region 25 of the core wire crimping portion 23 . Thus, between the core wire exposed portion We1a and the core wire crimping portion 23, contact reliability can be improved by the serrations 25a of the core wire holding region 25 and also by the respective graphenes 31. Therefore, this electric wire Wt with a terminal can further improve the quality of electric conduction between the core wire exposed portion We1a and the core wire crimping portion 23 .

Here, the graphene 31 is, for example, a broken graphene body obtained by breaking the formed graphene compact 30 (FIGS. 3 to 5). In the electric wire Wt with a terminal, the graphene molded body 30 molded as a separate part is broken in advance, and a plurality of graphenes (broken graphene bodies) 31 thus obtained are bonded to the core wire exposed portion We1a and the core wire crimped portion before crimping. 23, the core wire crimping portion 23 may be crimped to the exposed core portion We1a.

However, in the electric wire Wt with a terminal shown here, the graphene molded body 30 is interposed between the core wire exposed portion We1a before crimping and the core wire crimping portion 23, and the core wire crimping portion 23 is crimped to the core wire exposed portion We1a. Let In this terminal-equipped electric wire Wt, by breaking the graphene molded body 30 by the pressure applied during crimping, a plurality of graphene (broken graphene bodies) 31 are formed into a crimped state of the exposed core portion We1a and the crimped portion 23 of the core wire. intervene between Therefore, the graphene molded body 30 is formed such that a part or all of the region is broken by the pressure applied when the core wire crimping portion 23 is crimped to the core wire exposed portion We1a. For example, the graphene compact 30 is provided as a graphene film formed on one of the exposed core portion We1a and the crimped core portion 23 before crimping. The graphene molded body 30 is formed by applying a coating such as coating to the surface of either one of the core wire exposed portion We1a and the core wire crimping portion 23 before crimping, or by printing. to form a film. Further, the graphene molded body 30 may be molded as a single-layer body or may be molded as a multi-layer body.

When the crimp terminal 10 is provided with the terminal fitting 20, the graphene molded body 30 is provided on the core wire crimping portion 23 of the electric wire crimping body 22 so as to be interposed between the core wire exposed portion We1a (FIGS. 3 and 4). The graphene molded body 30 may be provided at least in a portion of the inner wall surface of the core wire crimping portion 23 that directly covers the core wire exposed portion We1a. For example, when the core wire crimping portion 23 forms an overlap crimp, the portion of the other first barrel piece 23a that covers the one first barrel piece 23a does not necessarily need to be provided with the graphene compact 30. On the contrary, interposing a plurality of graphenes (fractured graphene bodies) 31 between the overlapping portions of the pair of first barrel pieces 23a may cause a gap, so liquid such as water cannot enter the gap. It is desirable not to provide the graphene compact 30 in order to suppress penetration.

In the core wire crimping portion 23 shown here, a rectangular core wire holding region 25 is provided over substantially the entire inner wall surface thereof, and the graphene molded body 30 is formed in a rectangular shape so as to cover the entire surface of the core wire holding region 25. A film is formed (FIGS. 3 and 4). Here, the core wire crimping portion 23 before crimping is formed into a rectangular flat plate shape and then bent into a U shape. The graphene molded body 30 may be formed on the U-shaped core wire crimping portion 23 ( FIG. 3 ), or may be formed on the flat plate-like core wire crimping portion 23 . (Fig. 4).

In this electric wire Wt with a terminal, the outer wall surface of the core wire crimping portion 23 on which the graphene molded body 30 is provided is pressed by the anvil of the crimping machine and the crimper (not shown), whereby the core wire crimping portion 23 is is crimped to the exposed core portion We1a together with the graphene molded body 30. As shown in FIG. At that time, the graphene molded body 30 is broken as the pair of first barrel pieces 23a are wound around the core wire exposed portion We1a while being pressurized by the crimping machine, or the core wire crimping portion 23 is broken while being pressurized by the crimping machine. is pressed against the core wire exposed portion We1a, and part or all of the region changes into a plurality of graphenes (broken graphene bodies) 31. Therefore, in this electric wire Wt with a terminal, the plurality of graphenes (broken graphene bodies) 31 can be interposed between the core wire exposed portion We1a in the crimped state and the core wire crimping portion 23 .

Moreover, when the electric wire We is provided with the graphene molded body 30, the graphene molded body 30 is provided on the outer periphery of the exposed core portion We1a (FIG. 5). The graphene molded body 30 may be provided at least in a portion of the outer periphery of the core wire exposed portion We1a that is directly covered by the inner wall surface of the core wire crimping portion 23 . In the core wire exposed portion We1a shown here, the graphene molded body 30 is formed in a cylindrical shape so as to cover the entire circumferential surface of the portion directly covered by the inner wall surface of the core wire crimping portion 23 on the outer circumference.

In the electric wire Wt with a terminal, a pressure is applied from an anvil of a crimping machine and a crimper (not shown) to the outer wall surface of the core wire crimping portion 23, thereby exposing the core wire exposed portion We1a provided with the graphene molded body 30. The core wire crimping portion 23 is crimped. At that time, the graphene molded body 30 is broken as the core wire crimping portion 23 is pressed against the core wire exposed portion We1a while being pressurized by the crimping machine, and part or all of the region is formed of a plurality of graphenes (broken graphene body ) 31. Therefore, in this electric wire Wt with a terminal, the plurality of graphenes (broken graphene bodies) 31 can be interposed between the core wire exposed portion We1a in the crimped state and the core wire crimping portion 23 .

As described above, in the terminal-equipped electric wire Wt of the present embodiment, the plurality of graphenes 31 are interposed between the core wire exposed portion We1a and the core wire crimping portion 23 of the wire crimping body 22, so the contact reliability therebetween is high. can be improved, and the energization quality during that time can be improved. In the crimp terminal 10 and the electric wire We of the present embodiment, the core wire crimping portion 23 of the electric wire crimping body 22 is crimped to the core wire exposed portion We1a to break the graphene molded body 30, and the core wire exposed portion We1a and the wire crimping body Since a plurality of graphenes 31 can be interposed between the core wire crimping portion 23 of 22 and the core wire crimping portion 23, the contact reliability therebetween can be improved, and the energization quality therebetween can be improved.

REFERENCE SIGNS LIST 10 crimp terminal 20 terminal fitting 22 wire crimping body 23 core wire crimping portion 25 core wire holding region 25a serration 30 graphene compact 31 graphene We wire We1 core wire We1a core wire exposed portion We2 coating Wt wire with terminal

Claims (7)

an electric wire;
a terminal fitting having an electric wire crimping body crimped to an exposed core wire exposed portion of the core wire at the end of the electric wire;
a plurality of graphenes embedded between the core wire exposed portion and the wire crimped body;
with
The electric wire crimping body has a core wire holding region in which serrations each of which includes at least one of a plurality of concave portions and a plurality of convex portions are formed and the serrations hold the core wire exposed portion,
The electric wire with a terminal , wherein the graphene is interposed between the core wire exposed portion and the core wire holding region . an electric wire;
a terminal fitting having an electric wire crimping body crimped to an exposed core wire exposed portion of the core wire at the end of the electric wire;
a plurality of graphenes embedded between the core wire exposed portion and the wire crimped body;
with
An electric wire with a terminal, wherein the graphene is a fractured graphene body obtained by breaking a formed graphene molded body. 2. The electric wire with a terminal according to claim 1 , wherein the graphene is a fractured graphene body obtained by breaking a molded graphene compact. The graphene molded body is formed such that a part or all of a region thereof is broken by a pressure applied when the wire crimped body is crimped to the exposed core portion, and the exposed core portion and the wire before crimping are separated from each other. 4. The electric wire with a terminal according to claim 2 or 3, wherein the electric wire is interposed between the crimped body and the crimped body. 5. The electric wire with a terminal according to claim 4, wherein the graphene formed body is a graphene film formed on either one of the exposed core portion before crimping and the crimped body of the electric wire. A terminal fitting having a wire crimping body to be crimped to a bare core wire exposed portion of a core wire at the end of the wire;
a graphene molded body provided in the electric wire crimped body to be interposed between the core wire exposed portion;
with
A crimp terminal, wherein the graphene molded body is formed such that a part or all of a region thereof is broken by a pressure applied when the wire crimped body is crimped to the core wire exposed portion. a conductive core wire;
an insulating coating covering the outer periphery of the core wire;
a graphene molded body provided on the outer periphery of the bare core wire exposed portion of the core wire of the terminal;
with
The electric wire, wherein the graphene molded body is formed such that a part or all of a region thereof is broken by a pressure applied when a crimped electric wire body of a terminal fitting is crimped to the exposed core portion.

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