JPH08222283A - Crimp terminal - Google Patents

Abstract

PURPOSE: To prevent heating of a fuse box or the like in which a crimp terminal and a terminal housing chamber are arranged by radiating heat generated in the crimp terminal and an electric wire connecting part. CONSTITUTION: A conductive metallic plate is bent, and a plate-like board 2, a female-shaped or male-shaped electric contact part 3 arranged on one end side of this board, a conductor barrel 4 and an insulating covered barrel 5 arranged on the other side of the board, are provided. The conductor barrel and the insulating covered barrel are respectively calked and crimped to a conductor 10 exposed from the tip of an electric wire W and insulating covering 11 in close vicinity to this conductor. In this crimp terminal 1, a heat radiating part 6 extended to the electric wire side more than an end part of the board on which the insulating covered barrel of the board is arranged is provided, and an insulating coating film 8 composed of insulating resin is arranged at least on an outer peripheral surface of this heat radiating plate part. When this crimp terminal is housed in a terminal housing chamber 15 of a fuse box or the like, the heat radiating plate part 6 is set in a dimension projecting outside from the opening end 15a of the terminal housing chamber 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crimp terminal for connecting an electric wire, and more particularly, at a connecting portion between a crimp terminal for a large current mounted in a fuse box or the like and an electric wire, heat radiation at the connecting portion is effective. The purpose is to prevent heating in the box.

[0002]

2. Description of the Related Art An electric wire used in a wire harness for an automobile is crimped by crimping a crimp terminal to a core wire exposed at the end of the electric wire, and the male and female terminals are mated with the crimp terminal to be connected. ing.

The crimp terminal attached to the end of the electric wire is
It is inserted into a large number of terminal accommodating chambers arranged side by side in a connector housing, a relay box or a fuse box. For example, by fitting a male connector housing and a female connector housing to each other, the electrical components on the power source side and the load side are electrically connected. It constitutes an electrical circuit that connects the product.

[0004]

Heat is likely to be locally generated around the connecting portion between the core wire of the electric wire and the crimp terminal, that is, around the caulking portion of the core wire by the core wire barrel. When heat is generated, the resistance value becomes large and the maximum energization amount decreases, and at the same time, the resin housing of the connector housing, relay box, fuse box, etc. in which the terminal accommodating chamber is installed is softened by heating, and finally the case. There was also a risk of melting.

In particular, when connecting the electric wire on the power source side and the electric wire on the load side through a fuse in the fuse box, as shown in FIG. 9, a crimp terminal T1 connected to the electric wire W on the power source side through which a large current flows. Since the width of the core barrel V of the crimp terminal T1 is narrow at the connecting portion between the fuse H and the male tab T2 of the fuse H,
There is a problem that the resistance value becomes high, heat is easily generated by energization, and the fuse box is easily heated.

The present invention has been made in view of the above problems, and efficiently dissipates heat locally generated at the connection portion between the crimp terminal and the electric wire to reduce the heat generation, thereby improving the fuse box,
The purpose is to prevent heating of the relay box and connector housing.

[0007]

In order to achieve the above-mentioned object, the present invention provides a flat substrate and a female shape provided on one end side of the substrate by refracting a conductive metal plate according to claim 1. Alternatively, a male-shaped electric contact portion, a core wire barrel and an insulation coating barrel provided on the other side of the substrate are provided, and the core wire barrel and the insulation coating barrel are exposed from the tip of the wire and the core wire is close to the core wire. A crimping terminal crimping crimping to an insulating coating respectively, wherein a heat radiating plate portion further extending toward an electric wire from an end portion of the substrate provided with the insulating coating barrel is provided, and at least an outer periphery of the heat radiating plate portion. An insulating coating made of an insulating resin is provided on the surface, and the heat radiation plate portion is set to have a size protruding from the opening end of the terminal accommodating chamber when the crimp terminal is accommodated in the terminal accommodating chamber such as a fuse box. We offer the characteristic crimp terminal

The heat radiating plate portion has a flat plate shape extending from the substrate and has a width wider than that of the substrate where the core wire barrel and the insulating coating barrel are provided so as to be less than the width of the terminal accommodating chamber ( Claim 2). Alternatively, the heat radiating plate portion is formed in an annular shape so as to surround the electric wire with a gap (claim 3). The annular shape may be any shape such as a box shape or an annular shape.

Further, the crimp terminal is provided with bending portions at both ends in the length direction of the substrate, which are bent and bent upward from both edges in the width direction of the substrate, and the bending portions have the same shape but are dimensioned. Differently, depending on the dimensions of the mating male electrical contact portion, one of them is used as the electrical contact portion, while the other is used as the heat sink portion, and the side used as the heat sink portion is
An insulating resin coating may be provided on the outer peripheral surface (claim 4).

A vinyl chloride resin, a polyethylene resin, or the like is preferably used as the insulating resin coating the heat radiating plate portion, and the heat radiating plate portion is coated by immersing it in a reservoir of the insulating resin.

[0011]

In the crimp terminal according to the first aspect, the heat generated in the core wire barrel of the crimp terminal connected to the core wire of the electric wire can be conducted to the heat radiating plate portion and radiated to the outside from the opening side of the terminal accommodating chamber. Therefore, the crimp terminal becomes high heat due to heat generation, the maximum energization amount is reduced, and it is possible to prevent the thermal influence due to the reduction of the energization amount to the load side component. Moreover, it is possible to prevent softening of the resin-made terminal housing box due to heating. Further, since the surface of the heat dissipation plate is coated with the insulating resin, it does not come into contact with other terminals or parts to cause a short circuit.

The area of the heat radiating plate portion is either in the case where the heat radiating plate portion is formed of a wide flat plate substrate as described in claim 2 or in the case where it is formed in an annular shape as described in claim 3. The heat dissipation effect can be improved by increasing the value.

Further, as described in claim 4, when the refraction portions that can be female electric contact portions are provided at both ends in the length direction of the substrate of the crimp terminal, the mating male electric contact portions to be connected are provided. Depending on the size of the above, either one can be used as a female electric contact portion and the other can be used for heat dissipation. Therefore, it is not necessary to form the crimp terminal having the female type electric contact portions having different sizes, and the crimp terminal can be shared.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. FIG. 1 is a crimp terminal 1 according to an embodiment of the present invention.
Is formed by punching a conductive metal plate into a required shape and then bending it. The crimp terminal 1 includes a flat plate-shaped elongated substrate 2, a female electric contact portion 3 provided at one end of the substrate by being bent upward, a core wire barrel 4 provided at a substantially central portion of the substrate, and an insulating coating barrel 5. , And the heat radiating plate portion 6 extending to the other end side of the substrate 2.

The female electric contact portion 3 has a shape which is bent and bent upward from both side edges of the substrate 2 which is slightly wider than the central portion in the lengthwise direction, and is a pair of semi-annular bending portions 3.
A mating male electric contact portion (not shown) is inserted into the space between a and 3b and the substrate 2 so as to establish an electrical connection.

The core wire barrel 4 and the insulating coating barrel 5 provided in the central portion of the substrate 2 having a slightly narrow width have a pair of caulking pieces 4a, 4b, 5a, which are projected upward from both sides of the substrate 2.
5b and.

The heat radiating plate portion 6 has a flat plate shape having a width slightly wider than the same width of the substrate in the female electric contact portion 3.
As shown in FIG. 3, the entire surface of the conductive metal plate is covered with an insulating resin coating 8 made of vinyl chloride resin.

The coating 8 made of the insulating resin is formed by bending a conductive metal plate and then immersing the heat dissipation plate portion 6 in a resin tank 9 as shown in FIG.

As shown in FIG. 5A, in the crimp terminal 1 having the above-described structure, the electric wire W is arranged on the heat radiating plate 6 side, and the core wire 10 exposed from the end of the electric wire W is caulked on the core wire barrel 4. The insulation coating 11 adjacent to the core wire 10 is placed between the pieces 4a and 4b between the caulking pieces 5a and 5b of the insulation-coated barrel 5. In this state, as shown in FIG. 5 (B), after being installed in the lower die 12 of the terminal crimping device, as shown in FIG. 5 (C),
The upper die 13 is lowered to crimp the core wire barrel 4 to the core wire 10 and the insulation coating barrel 5 to the insulation coating 11 to crimp them, and attach the wires to the tip of the electric wire W as shown in FIG.

When the crimp terminal 1 provided with the heat dissipation plate portion 6 is inserted into the terminal accommodating chamber 13 of the fuse box as shown in FIG. 6, the heat dissipation plate portion 6 has the opening end 1 of the terminal accommodating chamber 15.
It is in a state of projecting outside from 5a.

With the above-described structure, when the crimp terminal 1 is energized and locally generates heat at the position of the core barrel 4, the heat is transmitted to the heat radiating plate portion 6 and the heat is generated in the terminal accommodating chamber 15 through the heat radiating plate portion 6. Can radiate heat from the outside into the air. The amount of heat radiation varies depending on the size of the heat radiation plate 6, but for example, about 10 Jude can be radiated. As a result, it is possible to prevent heat from being accumulated and heated inside the terminal accommodating chamber 15. As a result, heating of the crimp terminal 1 itself is suppressed, and it is possible to prevent a decrease in the maximum energization amount due to an increase in resistance value, and it is possible to prevent the fuse box provided with the terminal accommodating chamber 15 from being softened by heating.

The shape of the heat radiating plate portion 6 formed integrally with the crimp terminal 1 is not limited to the above-mentioned embodiment, and for example, as shown in FIG.
As shown in (B) and (C), the electric wire W may be surrounded by a ring. It should be noted that such an annular shape increases the area of the heat dissipation plate portion, and can improve the heat dissipation effect.

Further, the crimp terminal 1 shown in FIG.
Bent portions 16 and 17 in the shape of a semi-circle are projected from both sides in the width direction at both ends in the longitudinal direction, and these bent portions 16 and 17 have the same shape in which the widths of the continuous substrate 2 are different from each other. Is forming. The crimp terminal 1 uses the refraction portion 16 or 17 having a size corresponding to the size of the mating male electric contact portion (not shown) to be connected as the electric contact portion 3, but does not correspond to the refraction portion 17 or 16. Is used as the heat dissipation plate 6. Further, the refraction portion on the side used as the heat dissipation plate portion 6 is immersed in the resin tank 9 to form the insulating resin film 8 on the outer peripheral surface, as in the above.

According to the crimp terminal 1, the heat generated in the connecting portion with the electric wire W can be surely radiated to prevent the terminal housing chamber from being heated, as in the above case. In addition, the refraction portions 16 having different sizes that can be the electric contact portions 3 on both ends of the substrate 2,
Since 17 is formed, it is not necessary to form crimp terminals corresponding to the dimensions of the mating male electrical contact portion,
Can be shared.

[0025]

As is apparent from the above description, in the crimp terminal according to claim 1 of the present invention, the heat radiating plate portion is made to extend from the end of the barrel side substrate for crimping and crimping the electric wire to the electric wire side. Therefore, the heat generated between the core wire of the electric wire and the core wire barrel can be conducted to the outside through the heat dissipation plate portion from the opening side of the terminal accommodating chamber. Therefore, the crimp terminal becomes high heat due to heat generation, the maximum energization amount is reduced, and it is possible to prevent the thermal influence due to the reduction of the energization amount to the load side component. Further, it is possible to prevent the terminal housing box made of resin from being softened by heating. Furthermore, since the surface of the heat dissipation plate is coated with the insulating resin, it is possible to prevent inconveniences such as short-circuiting due to contact with other terminals or parts.

In the crimp terminal according to the second and third aspects, since the heat dissipation plate portion is formed of a wide flat plate-shaped substrate or formed in an annular shape to increase the surface area of each, a heat dissipation effect is obtained. Can be raised.

According to a fourth aspect of the present invention, in the crimp terminal, the size of the mating male electric contact portion is formed by forming the refraction portions that can be female electric contact portions at both ends of the length of the substrate of the crimp terminal. Accordingly, one of them can be used as a female type electrical contact portion, and the other can be used for heat dissipation. Therefore, it is not necessary to form a crimp terminal having female type electric contact portions having different dimensions, and the crimp terminal can be shared and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a crimp terminal of the present invention.

FIG. 2 is a perspective view showing a state in which a crimp terminal is attached to an electric wire.

FIG. 3 is a cross-sectional view showing a heat dissipation plate portion of the crimp terminal.

FIG. 4 is a perspective view showing a state in which a coating film is formed on a heat dissipation plate portion.

5 (A), (B) and (C) are perspective views showing a process of attaching an electric wire and a crimp terminal.

FIG. 6 is a cross-sectional view showing a state in which a crimp terminal to which an electric wire is attached is inserted into a terminal accommodating chamber.

7 (A), (B) and (C) are schematic views showing modified examples of the shape of the heat dissipation plate.

FIG. 8 is a perspective view showing another modification of the heat dissipation plate.

FIG. 9 is a perspective view showing a connection state between a conventional crimp terminal and a tab of a fuse.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crimping terminal 2 Substrate 3 Electric contact part 4 Core wire barrel 5 Insulation coating barrel 6 Radiating plate part 8 Insulation coating 10 Core wire 11 Insulation coating 15 Terminal accommodating chamber 15a Open end W Electric wire

Claims (4)

[Claims] 1. A conductive metal plate is bent to insulate a flat substrate, a female or male electrical contact portion provided on one end side of the substrate, and a core wire barrel provided on the other side of the substrate. A crimp terminal for crimping a core wire barrel, an insulation coating barrel exposed from the tip of an electric wire, and an insulation coating adjacent to the core wire. A heat radiating plate portion that extends further toward the electric wire side is provided from the end portion of the board on which the insulating film made of an insulating resin is provided on at least the outer peripheral surface of the heat radiating plate portion. The heat-dissipating plate portion is set to have a size projecting outward from the open end of the terminal accommodating chamber when accommodated in the terminal accommodating chamber. 2. The heat dissipation plate portion has a flat plate shape extending from the substrate and has a width wider than that of the substrate at the portion where the core wire barrel and the insulating coating barrel are projectingly provided, and is set to be equal to or less than the width of the terminal accommodating chamber. The crimp terminal according to claim 1. 3. The crimp terminal according to claim 1, wherein the heat dissipation plate portion has an annular shape that surrounds the electric wire with a gap therebetween. 4. The crimp terminal is provided with bending portions at both ends in the length direction of the substrate, which are bent and bent upward from both edges in the width direction of the substrate, and the bending portions have the same shape but have dimensions. Depending on the size of the male type electrical contact part of the mating type, one of them is used as the electrical contact part, while the other is used as the heat sink part, and the side used as the heat sink part is its outer peripheral surface. The crimp terminal according to claim 1, wherein an insulating resin coating is provided on the.