JP3542341B2 - Crimp terminal for insulated wire - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention mainly relates to a crimp terminal suitable for crimping and connecting a thin covered electric wire (hereinafter referred to as a thin wire) having an AWG # 30 to # 40 wire size.
[0002]
[Prior art]
The crimp terminal usually has a wire barrel and an insulation barrel. The core portion of the wire tip from which the insulation coating has been peeled (stripped) is crimped with a wire barrel, and the insulation coating portion adjacent to the core wire portion is connected to the insulation barrel. It is designed to be crimped.
[0003]
[Problems to be solved by the invention]
However, in the above-mentioned thin wire, for example, in the case of an AWG # 36 thin wire, a wire having an outer diameter of about 0.15 mm obtained by twisting seven ultrafine wires having a diameter of 0.05 mm and a thickness of 0.05 mm is used. Since the wire is an insulated wire (outer diameter of about 0.25 mm), if the wire is stripped, the thin core wire may be broken, making it difficult to perform crimping work with high connection reliability. there were. Conventionally, such fine wires are connected by soldering, but there is a problem that the workability is low and the impedance varies.
[0004]
Therefore, the inventors of the present application have intensively studied to develop a crimp terminal capable of crimping and connecting an extremely thin covered electric wire without peeling off the insulating coating, and as a result of repeating various tests, a through-hole was formed at the bottom of the wire barrel. By punching and identifying the punching direction, it is found that only the insulating coating is broken at the inner edge of the through hole, the core wire can be crimped without breaking, and a good electrical connection can be obtained. I started. The present invention has been made based on this finding.
[0005]
On the other hand, Japanese Patent Application Laid-Open No. 7-296860 discloses a crimp terminal suitable for connecting an enameled wire, in which a through-hole is provided at the bottom of a wire barrel. The crimp terminal is formed by protruding an edge of the through hole to the crimp side (inside) and forming an edge. When crimping an electric wire, the edge breaks an insulating coating of an enamel wire and bites into a core wire. They are said to be electrically and mechanically connected.
[0006]
However, when such a crimp terminal is applied to crimp connection of a thin wire, that is, a very thin coated electric wire, which is the object of the present invention, the edge formed at the edge of the through hole not only breaks the insulating coating, but also forms a core wire. Since it breaks, there is a problem in connection reliability.
[0007]
The present invention specifies a punching direction of a through-hole provided at the bottom of a wire barrel, thereby breaking only an insulating coating at an inner peripheral portion of the through-hole. It is an object of the present invention to provide a crimp terminal for a covered electric wire capable of obtaining an electrical connection.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a crimp terminal for a covered wire of the present invention is a crimp terminal for crimping and connecting a thin covered wire of AWG # 30 to # 40, and a through hole is formed at the bottom of the wire barrel. Is punched, an R surface is formed by punching on the inner peripheral edge of the through-hole , and the insulation coating portion of the covered electric wire is locally broken by the R surface at the time of crimping, and the core wire portion passes through the R surface. It is characterized by being electrically connected to the wire barrel .
[0009]
The diameter of the through-hole should be substantially the same as the outer diameter of the coated electric wire when inserting the coated electric wire to be crimped into the inner bottom of the wire barrel to facilitate positioning of the coated electric wire with respect to the through-hole. Is preferred.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[0011]
FIG. 1 shows a crimp terminal 1 according to the present invention, and FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. The crimp terminal 1 is used for crimp-connecting an extra-fine covered electric wire (thin wire) 10 having an electric wire size of AWG # 30 or less without peeling off an insulating coating portion 12 thereof, and is the same as a conventional crimp terminal. A wire barrel 2 for crimping the core wire portion 11 and an insulation barrel 3 for crimping the insulating coating portion 12 are provided integrally with a socket-shaped connecting portion 4 at the tip of the wire barrel 2. A circular through-hole 5 is provided at the bottom of the wire barrel 2 formed in an upwardly extending U-shape. The diameter A of the through hole is formed to be substantially the same as or slightly larger than the outer diameter of the thin wire 10 to be crimped. For example, when the fine wire 10 has an electric wire size of AWG # 36, as described above, the core wire portion 11 obtained by twisting seven ultrafine conductive wires having a diameter of 0.05 mm has an outer diameter of about 0.15 mm. Since the outer circumference of the core wire portion 11 is coated with an insulating coating having a thickness of 0.05 mm and the outer diameter of the insulating coating portion 12 is about 0.25 mm, the diameter A of the through hole 5 is a small diameter of about 0.25 mm to 0.3 mm. Hole. The through hole 5 is formed by punching from the inside to the outside of the wire barrel 2, and as shown in FIG. 2, an R surface 6 generated by the punching process is formed on the inner peripheral portion. Have been.
[0012]
FIG. 3 shows a state in which the fine wire 10 is crimp-connected to the crimp terminal 1 having the above configuration. The crimping of the insulating coating portion 12 by the insulation barrel 3 is the same as that of the conventional crimp terminal, but the crimping by the wire barrel 2 is performed as shown in FIG. 4 and FIG. It is press-fitted into the through-hole 5, and is locally broken by the R surface 6 at the inner peripheral portion of the through hole 5, and the core wire portion 11 is in contact with the R surface 6 without being broken. Through the wire barrel 2 and are electrically connected.
[0013]
In the illustrated embodiment, only one through-hole 5 is provided. However, if a plurality of through-holes 5 are provided, a more reliable electrical connection can be obtained. The shape of the through hole 5 is not limited to a circle, but may be an ellipse, a square, or any other shape.
[0014]
【The invention's effect】
As described above, according to the present invention, when the covered electric wire is crimped with the wire barrel, only the insulating covering portion is locally broken at the R surface formed on the inner peripheral portion of the through hole provided at the bottom. , it can be electrically connected to the wire barrel through the R surface without breaking the core portion. Therefore, the crimp terminal of the present invention crimps and connects a very thin coated electric wire without peeling off its insulating coating, thereby obtaining a highly reliable electrical connection.
[Brief description of the drawings]
FIG. 1 is a plan view of a crimp terminal according to the present invention.
FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG.
FIG. 3 is a vertical sectional front view showing a state where the covered electric wire is crimped and connected by the crimp terminal.
FIG. 4 is an enlarged cross-sectional view of a crimp connection part by the wire barrel of FIG. 3;
FIG. 5 is a sectional view taken along line 5-5 in FIG. 4;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Crimp terminal 2 Wire barrel 3 Insulation barrel 4 Connection part 5 Through-hole 6 R surface 10 Extra-fine covered electric wire (fine wire)
11 core wire section 12 insulation coating

Claims (2)

A crimp terminal for crimping and connecting a thin insulated wire having a wire size of AWG # 30 to # 40,
Through holes in the bottom of the wire barrel have been stamped, the R face by stamping on the inside periphery of the through hole is formed, locally the insulation covering portion of the covered wire by the R surface during crimping
A crimp terminal for a coated electric wire, wherein the core wire portion is electrically connected to the wire barrel through the R surface . The crimp terminal for a covered wire according to claim 1, wherein the diameter of the through hole is substantially the same as the outer diameter of the covered wire.

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