JPH0572053U - Wire crimp terminal - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a wire crimp terminal capable of crimp-connecting even a thin insulated wire with sufficient tensile strength. [Structure] An opening through which an insulator 32 of an insulated wire 30 escapes at a base portion of an insulation barrel 14 of a wire crimp terminal 10 having a wire crimp portion having a wire barrel 12 and an insulation barrel 14 at an end opposite to a contact portion 16 with a mating terminal. 20 or a recess 20 'is formed. By caulking the insulation barrel 14 to the insulated wire 30, the strain relief and the tensile strength of the insulated wire 30 are reinforced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electric terminal, and more particularly to a wire crimp terminal for press-connecting an insulated wire to a terminal (contact) of an electric connector or the like.

[0002]

[Prior Art]

 Various methods have been proposed for connecting an insulated wire in which a plurality of twisted wires are covered with an insulator to an electrical terminal for an electrical connector. For example, the conductor may be soldered or welded to the terminal, or the conductor may be screwed or bolted. However, these connection methods are disadvantageous in that they require a long time for connection and that the electrical and mechanical connection characteristics tend to vary due to individual differences or proficiency among workers, resulting in lack of stability. There is a demand for quick and uniform connection using a machine, and two typical connection methods, so-called crimping and pressure welding, have been proposed and widely used.

Such a crimp terminal has a male (tab) or female (receptacle) contact portion with a terminal of a mating connector, as disclosed in, for example, US Pat. No. 2,748,452 and Japanese Patent Publication No. 40-3899. It has a crimp connection consisting of a wire barrel and an insulation barrel at the end opposite to. A wire barrel is a crimping piece that is crimped around an exposed wire of an insulated wire using a hand tool or power tool. The wire barrel is permanently deformed by being caulked around the stranded wire with sufficient force to electrically and mechanically connect the stranded wire phases and between the stranded wire and the wire barrel. On the other hand, the insulation barrel is crimped to the outer circumference of the insulated wire insulator. This insulation barrel acts as a so-called strain relief that prevents the deterioration of its electromechanical connection characteristics when a force is applied to the wire barrel when an external force is applied to the insulated wire.

[0004]

[Problems to be solved by the device]

 There are applications where a large external force acts on the insulated wire. Especially in the case of thin insulated wires, the conventional crimp terminals cannot provide sufficient tensile strength. For example, when a tensile strength of 10 kg is required, in the case of a thin insulated wire, the wire may come out of the wire barrel or the wire (conductor) itself may be cut.

Therefore, the object of the present invention is to obtain sufficient tensile strength even if it is a thin wire, and basically has a wire barrel and an insulation barrel as in the conventional case, and crimps with a conventional caulking (pressing) tool. It is to provide a new wire crimp terminal capable of performing work.

[0006]

[Means and Actions for Solving Problems]

 According to the wire crimp terminal of the present invention, an opening having a desired shape is formed in the base of the insulation barrel portion of the crimp portion having the wire barrel and the insulation barrel, or a recess having a sufficient depth is formed in the inner surface of the base. And

Further, according to the second wire crimp terminal of the present invention, it is characterized in that the insulation barrel is formed with an elongated opening or a recess extending from its tip to its base.

When the insulation barrel is crimped to the insulator portion of the insulated wire, a part of the insulator enters the opening or the recess. Therefore, when an external force acts on the insulated wire, a part of the external force is shared by the insulator or the insulation barrel. For example, if you need a tensile force of 10 kg, you can share the tensile force of 7 kg with the wire barrel and 3 kg with the insulation barrel to get the required total tensile force of 10 kg. This is because conventionally, the insulation barrel was used only for the strain relief action so that the force in the direction orthogonal to the axial or longitudinal direction of the insulated wire was not transmitted to the wire barrel part, and it was not considered to be used for tensile force. Is a completely different concept.

[0009]

Embodiments Hereinafter, preferred embodiments of the wire crimp terminal of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an exploded perspective view showing a main part of a wire crimping terminal 10 according to the present invention, particularly a crimping part. The wire crimp terminal 10 is formed by punching out a metal plate of copper alloy such as brass. This wire crimp terminal 10 is the same as the conventional wire crimp terminal in that it has a wire barrel 12, an insulation barrel 14, and a contact portion 16 which is partially omitted. However, the wire crimp terminal 10 of the present invention is different from the conventional wire crimp terminal in that the wire crimp terminal 10 has the opening 20 at the base portion or the central portion of the insulation barrel 14. The shape of the opening 20 may be of arbitrary shape and does not necessarily have to be circular as shown. However, as will be described later, when the insulation barrel 14 of the wire crimp terminal 10 is crimped to the insulated wire, both ends 15a and 15b of the insulation barrel 14 are pressed on the insulator of the insulated wire, so that the opening 20 may have a rectangular shape close to the shape of both ends 15a and 15b. However, it goes without saying that the size should be such that the strength of the insulation barrel 14 is not impaired.

Next, the caulking connection between the wire crimp terminal 10 and the insulated wire 30 of the present invention will be described with reference to FIG. 2A is a perspective view showing a state in which the wire crimp terminal 10 of FIG. 1 is press-connected to one end of the insulated wire 30, and FIG. 2B is taken along line BB of FIG. 2A. The cross section of the insulation barrel 14 part is shown. As shown in FIG. 2 (A), the wire barrel 12 of the wire crimping terminal 10 of the present invention is exposed by the end treatment of the insulated wire 30. For example, it is electrically crimped by caulking around seven stranded wire conductors 31. To be done. In this particular embodiment, the insulated wire 30 is a fine insulated wire having an outer diameter of 0.9 mm and seven conductor wires having a diameter of 0.185 mm arranged in a stranded shape in the center. Therefore, only the wire barrel 12 can obtain a tensile strength of about 7 kg, but cannot obtain the tensile strength of 10 kg required for the application.

The insulation barrel 14 is caulked and fixed to the outer circumference of the insulator 32 of the insulated wire 30 as in the conventional case. That is, the insulation barrel 14 is bent so as to wrap the outside of the insulated wire 30, and the end portion thereof is pressed downward by the upper portion of the insulated wire 30. By this caulking work of the insulation barrel 14, a part of the insulation coating of the insulator 32, that is, the insulated wire 30 escapes into the opening 20 formed at the base of the insulation barrel 14. This state is shown in the sectional view of FIG. In this particular example, the opening 20 was circular with a diameter of 0.75 mm and the tensile strength of this insulation barrel 14 alone was greater than about 3 kg. Therefore, it can be understood that the combined tensile strength of both the insulation barrel 14 and the wire barrel 12 exceeds 10 kg, and the desired tensile strength can be obtained.

As described above, the insulation barrel 14 is intended to perform the function of the conventional strain relief, and it is not allowed to destroy the insulating coating or the insulator 32. Therefore, it was pressed and crimped with a force sufficiently smaller than that of the wire barrel 12. However, in the insulation barrel 14 of the wire crimp terminal 10 of the present invention, it is necessary to press the insulator 32 so that a part of the insulator 32 escapes into the opening 20. Therefore, in order to prevent the insulator 32 of the insulated wire 30 from being damaged by the insulation barrel 14, as shown in FIG. 1, sedge processing is performed so that a sedge 18 is formed on the inner peripheral edge of the insulation barrel 14. As a result, even if the insulation barrel 14 is caulked with a relatively large force, the insulated wire 30 will not be abnormal.

In order to increase the holding force of the insulated wire 30 by the insulation barrel 14, instead of the opening 20, as shown in FIGS. 3A and 3B, the recess 20 ′ or the longitudinal direction of the insulated wire 30 is changed. You may form one or more unevenness in the orthogonal direction. 3A is a perspective view of a wire crimp terminal 10 'having a substantially rectangular recess 20', and FIG. 3B is a sectional view thereof. The wire crimp terminal forming the recess is effective when the metal plate forming the terminal is relatively thick.

FIG. 4 is an exploded perspective view showing a main part of the wire crimp terminal 40 according to the third embodiment of the present invention, particularly a crimp part. This wire crimp terminal 40 also has a wire barrel 42, an insulation barrel 44, and a contact portion 46, which is partially omitted, like the conventional wire crimp terminal. The wire crimp terminal 40 of the present embodiment is characterized in that the insulation barrel 44 is formed with an elongated opening 52 extending from the tip portion 48 thereof toward the base portion 50. When the insulation barrel 44 is crimped onto the insulation coating (not disclosed) of the insulated wire, a portion of the insulation coating escapes into the opening 52, increasing the tensile strength of the insulated wire. The opening 52 extends from the distal end 48 of the insulation barrel 44 toward the base 50 so that the edge 52a of the opening 52 fits the insulation coating over a considerable extent in the circumferential direction of the insulation coating. It will be appreciated that this further increases the tensile strength of the insulated wire.

The wire crimp terminal of the present invention has been described above in detail with reference to the preferred embodiment. However, the present invention should not be limited to such a specific embodiment, and various modifications can be made if necessary. It will be understood.

For example, the opening 52 may be a recess as shown in FIG. Also, as shown in FIG. 5, the opening 52 'may be closed at the tip 48' of the insulation barrel 44 'as shown in FIG. Further, as shown in FIG. 4, the insulation barrel 44 may be provided with both the opening 52 and the opening 20 ″ indicated by a broken line. In this case, it is apparent that the tensile strength of the insulated wire is further increased as compared with the case where the opening 20 ″ or the opening 52 is provided alone.

[0018]

[Effect of the device]

 According to the wire crimp terminal of the present invention, the insulation barrel has an opening or a recess, and the insulator of the insulated wire crimped by the insulation barrel escapes into the insulation barrel to reinforce the tensile strength of the insulated wire. .. In addition, the structure for that is simple and there is no difference in manufacturing and crimping work from the conventional wire crimping terminal, and there is a practical effect that the conventional crimping tool can be used as it is. INDUSTRIAL APPLICABILITY The wire crimp terminal of the present invention is particularly suitable for a wire crimp terminal used for an insulating wire of a thin wire.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a main part of a wire crimp terminal according to a preferred embodiment of the present invention.

FIG. 2 is a perspective view and a cross-sectional view in which the wire crimp terminal of FIG. 1 is caulked and connected to an insulated wire.

FIG. 3 is a perspective view and a sectional view of a second embodiment of the wire crimp terminal of the present invention.

FIG. 4 is an exploded perspective view showing an essential part of a third embodiment of the wire crimp terminal of the present invention.

FIG. 5 is an exploded perspective view showing an essential part of a wire crimp terminal according to a fourth embodiment of the present invention.

[Explanation of symbols]

 10, 10 ', 40, 40' Wire crimp terminal 12, 12 ', 42, 42' Wire barrel 14, 14 ', 44, 44' Insulation barrel 20, 20 '', 52, 52 'Open 20' Recess 30 Insulated wire

Claims (2)

[Scope of utility model registration request] 1. A wire crimping terminal having a wire barrel and an insulation barrel for crimping and connecting an insulated electric wire, wherein an opening or a recess is formed at a base portion of the insulation barrel to provide a space between the insulated electric wire and the wire crimping terminal. A wire crimp terminal characterized by reinforced tensile strength. 2. A wire crimping terminal having a wire barrel and an insulation barrel for crimping and connecting an insulated electric wire, wherein the insulation barrel is formed with an elongated opening or recess extending from a tip portion thereof toward a base portion thereof. A wire crimping terminal, wherein tensile strength between the insulated wire and the wire crimping terminal is reinforced.