WO2015068648A1

WO2015068648A1 - Crimp terminal

Info

Publication number: WO2015068648A1
Application number: PCT/JP2014/079037
Authority: WO
Inventors: 孝裕松尾
Original assignee: 矢崎総業株式会社
Priority date: 2013-11-05
Filing date: 2014-10-31
Publication date: 2015-05-14
Also published as: JP2015090741A

Abstract

A crimp terminal (10) that has a conductor-crimping section (16) that: has a bottom section (16a) and crimping sections (16b) that extend from the sides of said bottom section (16a); and crimps a conductor (1) of an electric cable, said conductor (1) comprising a plurality of strands (1a). The surface of the conductor-crimping section (16) that the conductor (1) contacts has a corrugated section (19).

Description

Crimp terminal

The present invention relates to a crimp terminal connected to an electric wire.

A crimp terminal for crimping to an electric wire has been conventionally proposed (see Patent Document 1). 1 and 2 show conventional examples of crimp terminals. In FIG. 1 and FIG. 2, the electric wire W connecting the crimp terminal 110 is composed of a core wire 101 composed of a plurality of strands 101 a and an insulating sheath 102 covering the outer periphery of the core wire 101. At the tip end side of the electric wire W, the insulating sheath 102 is removed and the core wire 101 is exposed.

The crimp terminal 110 has a mating terminal connection portion 111 and a wire connection portion 115. The wire connection portion 115 includes a core wire crimping portion 116 and an outer skin crimping portion 117. The core wire crimping part 116 has a base part 116a and a pair of caulking piece parts 116b extending from both sides of the base part 116a. The outer skin crimping part 117 has a base part 117a and a pair of caulking piece parts 117b extending from both sides of the base part 117a.

The crimp terminal 110 crimps and crimps the core wire 101 exposed by the core wire crimping portion 116, and crimps and crimps the insulating sheath 102 by the outer skin crimping portion 117.

The crimping of the core wire crimping part 116 is performed by pressing the pair of crimping pieces 116b with a wire crimper (not shown) and plastically deforming the pair of crimping pieces 116b.

JP 2009-123623 A

By the way, in the crimping | compression-bonding location of the core wire 101 of the core wire crimping part 116, when the conduction | electrical_connection between the strands 101a of the core wire 101 cannot be obtained, the resistance of the whole circuit becomes high. A structure that reliably obtains conduction between the strands 101a of the core wire 101 is desired.

Therefore, an object of the present invention is to provide a crimp terminal that can reliably ensure conduction between the core wires and can reduce the resistance of the entire circuit.

The present invention is a crimp terminal having a base wire and a crimping piece portion extending from the side of the base portion and having a core wire crimping portion for crimping a core wire composed of a plurality of strands of an electric wire. The surface with which the core wire of a part contacts is a crimp terminal characterized by having a waveform surface.

The corrugated surface includes at least those provided on the base. The corrugated surface includes those that are corrugated in the direction orthogonal to the axial direction of the core wire.

According to the present invention, in the caulking process of the core wire crimping portion, a compressive force acts on the core wire, so that a new surface is generated when each strand extends. Here, there is a corrugated surface on the surface of the core wire crimping portion that contacts the core wire, and the core wire is deformed so as to follow the corrugated surface, so that the absolute amount of the generated new surface is increased compared to the surface without the corrugated surface. As a result, the amount of adhesion between the wires also increases, and the conduction characteristics between the wires are improved. From the above, the conduction between the core wires can be reliably ensured, and the resistance of the entire circuit can be reduced.

FIG. 1 is a perspective view of a conventional example before a wire is crimped to a crimp terminal. 2A and 2B show a conventional example, in which FIG. 2A is a side view of a crimp terminal to which an electric wire is crimped, and FIG. 2B is a sectional view taken along line IIb-IIb in FIG. FIG. 3 is a perspective view showing an embodiment of the present invention before a wire is crimped to a crimp terminal. 4A and 4B show an embodiment of the present invention, in which FIG. 4A is a side view of a crimp terminal to which an electric wire is crimped, and FIG. 4B is a sectional view taken along line IVb-IVb of FIG. 5A and 5B show an embodiment of the present invention, in which FIG. 5A is a development view of a core wire crimping portion, and FIG. FIG. 6 is a perspective view of a caulking jig according to an embodiment of the present invention. FIG. 7 is a side view showing an embodiment of the present invention and showing a caulking process using a caulking jig. 8A and 8B show a first modification of the embodiment of the present invention, in which FIG. 8A is a development view of a core wire crimping portion, and FIG. 8B is a sectional view taken along line VIIIb-VIIIb of FIG. 9A and 9B show a second modification of the embodiment of the present invention, in which FIG. 9A is a developed view of the core wire crimping portion, and FIG. 9B is a sectional view taken along line IXb-IXb in FIG. 10A and 10B show a third modification of the embodiment of the present invention, in which FIG. 10A is a development view of the core wire crimping portion, and FIG. 10B is a cross-sectional view taken along the line Xb-Xb in FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

3 to 7 show an embodiment of the present invention. As shown in FIGS. 3 and 4, the electric wire W includes a core wire 1 composed of a plurality of strands 1 a and an insulating sheath 2 that covers the outer periphery of the core wire 1. At the tip end side of the electric wire W, the insulating sheath 2 is removed and the core wire 1 is exposed. The core wire 1 is composed of a large number of strands 1a made of aluminum or aluminum alloy (hereinafter referred to as aluminum), and the numerous strands 1a are twisted together. That is, the electric wire W is an aluminum electric wire.

The crimp terminal 10 is made of, for example, a copper alloy, and is formed by bending a plate cut into a predetermined shape. The crimp terminal 10 has a mating terminal connection portion 11 and a wire connection portion 15. The electric wire connecting portion 15 includes a core wire crimping portion 16 and an outer skin crimping portion 17. The core wire crimping part 16 has a base part 16a and a pair of caulking piece parts 16b extending from both sides of the base part 16a.

As shown in detail in FIGS. 5 (a) and 5 (b), the base portion 16a of the core wire crimping portion 16 and the pair of crimping piece portions 16b have corrugated irregularities by press working on the surface with which the core wire 1 comes into contact. It has a continuous corrugated surface 19. The corrugated surface 19 has a continuous wave shape in a direction C2 orthogonal to the axial direction C1 of the core wire 1. Note that the wave shape is such that the recesses are arc-shaped, the arcs of the recesses have the same radius, the recesses are arranged at equal intervals, and an edge-shaped protrusion is formed at the intersection of the arcs of the recesses. Shape. In the corrugated surface 19, the length between adjacent convex portions of the corrugated shape in the orthogonal direction C2 of the axial direction C1 of the core wire 1 is approximately the same as the diameter of the strand 1a. The corrugated surface 19 is provided in almost the entire area of the core wire crimping portion 16.

The outer skin crimping portion 17 has a base portion 17a and a pair of caulking piece portions 17b extending from both sides of the base portion 17a.

The crimp terminal 10 crimps and crimps the core wire 1 exposed by the core wire crimping portion 16, and crimps and crimps the insulating sheath 2 by the outer skin crimping portion 17.

The crimp terminal 10 is crimped by a crimping jig 20 shown in FIG. The caulking jig 20 has a caulking groove 21 having a final caulking outer peripheral shape on the caulking tip side. As shown in FIG. 7, when the pair of caulking pieces 16 b are pressed from above by the caulking jig 20, the pair of caulking pieces 16 b are plastically deformed along the caulking groove 21.

In the caulking process of the core wire crimping portion 16, a compressive force acts on the core wire 1, so that a new surface is generated when each strand 1 a extends. Here, since the surface with which the core wire 1 of the core wire crimping part 16 contacts is the corrugated surface 19, the core wire 1 is deformed so as to follow the corrugated surface 19, and the generated new surface has no corrugated surface. Increased compared to Thereby, the adhesion amount between the strands 1a also increases, and the conduction | electrical_connection characteristic between the strands 1a improves. From the above, the conduction between the strands 1a of the core wire 1 can be reliably ensured, and the resistance of the entire circuit can be reduced.

Core wire 1 is made of aluminum. The aluminum wire 1a has a harder oxide film on the surface than the copper alloy. For this reason, the aluminum core wire 1 has a problem of an increase in electrical resistance due to the conduction resistance between the strands 1a. However, in the present invention, the conduction resistance between the strands 1a can be reduced by the occurrence of adhesion. Effective for aluminum wires. The aluminum core wire 1 is softer and easier to stretch than the copper alloy product, but as described above, it is possible to suppress the elongation of the core wire 1 in the core wire crimping portion 16 and to generate adhesion, so that the present invention is From this point of view, it is particularly effective for aluminum electric wires.

(Modification) FIG. 8 shows a first modification. In the first modification, the corrugated surface 19 is provided not in the entire area of the surface with which the core wire of the core wire crimping portion 16 contacts but in a partial region. Specifically, the corrugated surface 19 is provided only on the surface with which the core wire 1 of the base portion 16a comes into contact, that is, in the region that becomes the bottom surface of the core wire 1 during crimping.

Even in the first modification, the absolute amount of the new surface is increased as compared with the surface having no wave shape for the same reason as described above. Thereby, the adhesion amount between the strands 1a also increases, and the conduction | electrical_connection characteristic between the strands 1a improves.

The corrugated surface 19 is provided on the base portion 16a. In the caulking process of the core wire crimping portion 16, a stronger compressive force acts on the base portion 16a than in other locations, so that the generation of a new surface is promoted and the amount of adhesion between the strands 1a can be effectively increased.

FIG. 9 shows a second modification. In the second modification, the corrugated surface 19 is provided in almost the entire area of the surface of the core wire crimping portion 16 that contacts the core surface, as in the above-described embodiment. However, unlike the above-described embodiment, the corrugated surface 19 has a continuous wave shape in the axial direction C1 of the core wire 1. That is, the directions of the waves are different by 90 degrees.

FIG. 10 shows a third modification. In the third modified example, the corrugated surface 19 is provided in a partial region of the surface with which the core wire of the core wire crimping portion 16 comes into contact, as in the first modified example. Specifically, it is provided on the inner surface of the base portion 16a. However, unlike the first modified example, the corrugated surface 19 has a continuous wave shape in the axial direction C1 of the core wire 1.

In each of these modifications, the absolute amount of the new surface is increased as compared with the surface having no corrugation for the same reason as in the above embodiment. Thereby, the adhesion amount between the strands 1a also increases, and the conduction | electrical_connection characteristic between the strands 1a improves.

In both the embodiment and each modification, at least the corrugated surface 19 is provided on the base portion 16a. In the caulking process of the core wire crimping portion 16, a stronger compressive force acts on the base portion 16 a than in other locations, so that the generation of a new surface is promoted and the amount of adhesion between the strands 1 a can be increased effectively. .

The corrugated surface 19 of the embodiment and each modified example has a continuous waveform in the direction C2 orthogonal to the axial direction C1 of the core wire 1 or a continuous waveform in the axial direction C1 of the core wire 1. However, the wave shape may be continuous in an oblique direction of the axial direction C1 of the core wire 1. Also, the wave shapes in a plurality of directions are mixed (for example, both the wave shape is continuous in the axial direction C1 of the core wire 1 and the wave shape is continuous in the direction orthogonal to the axial direction C1 of the core wire 1). Also good. The corrugated surface 19 may be one in which the corrugations are not continuous but the corrugations are arranged at intervals.

In addition, a structure has been conventionally proposed in which serrations (grooves or protrusions) are provided on the surface of the core wire crimping portion 16 that contacts the core wire to promote the generation of a new surface. However, since the serration has a large change in the thickness of the core wire crimping portion 16, a problem occurs in the caulking process of the core wire crimping portion 16 such that the portion of the thin wall portion is greatly rolled and becomes very thin. On the other hand, in the said embodiment and each modification, in order to form the waveform surface 19 by making a substantially uniform press pressure act on the substantially whole area or a partial area | region of the core wire crimping part 16, of the core wire crimping part 16 There is an advantage that the above-described problems do not occur because the wall thickness does not change much.

However, the surface of the core wire crimping portion 16 that contacts the core wire may be serrated with the corrugated surface 19 of the present invention.

The size, depth, and the like of the wave pattern on the corrugated surface 19 are appropriately determined based on the elongation state of the strand 1a of the core wire 1 and the like.

In the embodiment, the core wire 1 is made of aluminum, but the present invention can also be applied to a core wire 1 other than aluminum (for example, made of copper alloy).

As mentioned above, although embodiment of this invention was described, these embodiment is only the mere illustration described in order to make an understanding of this invention easy, and this invention is not limited to the said embodiment. The technical scope of the present invention is not limited to the specific technical matters disclosed in the above embodiment, but includes various modifications, changes, alternative techniques, and the like that can be easily derived therefrom.

This application claims priority based on Japanese Patent Application No. 2013-229138 filed on November 05, 2013, the entire contents of which are incorporated herein by reference.

W electric wire 1 core wire 1a strand 10 crimp terminal 16 core wire crimp part 16a base 16b crimping piece 19 corrugated surface

Claims

Having a caulking piece extending from the side of the base and the base,
A crimping terminal having a core wire crimping part for crimping a core wire composed of a plurality of wires of an electric wire,
The crimp terminal according to claim 1, wherein a surface of the core wire crimping portion that contacts the core wire has a corrugated surface.
The crimp terminal according to claim 1,
The crimp terminal, wherein the corrugated surface is provided at least on the base portion.
The crimp terminal according to claim 1 or 2,
The crimp terminal according to claim 1, wherein the corrugated surface has a corrugated shape that is uneven in a direction orthogonal to the axial direction of the core wire.