JPH08222284A - Connecting method of crimp terminal and electric wire and connecting structure - 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 heat radiating sheet 1 by covering the whole surface with insulating resin 4 by leaving one side peripheral edge of heat conductive almost rectangular metallic foil 3, is provided. An insulating resin covered part of this heat radiating sheet is used as a heat radiating part 1b, and a part uncovered with the insulating resin is formed as a calking part 1a, and the calking part of the heat radiating sheet is wound round outer peripheral surfaces of a conductor barrel 2b and an insulating covered barrel 2c of a crimp terminal 2, and is installed in a condition where the other opposed side is projected to the electric wire side. When the conductor barrel and the insulating covered barrel are respectively calked and crimped to an exposed conductor of an electric wire and insulating covering, the heat radiating sheet is crimped to the conductor barrel and the insulating covered barrel at the same time. When the crimp terminal is housed in a terminal housing chamber of a fuse box or the like, an end part of the heat radiating sheet is positioned in the vicinity of the opening end 5a of the terminal housing chamber 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting a crimp terminal to an electric wire and a contact structure for connecting the crimp terminal and the electric wire connected by the connecting method, and particularly to a large current installed in a fuse box or the like. At the connection between the crimp terminal and the wire,
It is intended to effectively radiate heat in the connecting portion and 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 supply side and the electric wire on the load side in the fuse box through a fuse, as shown in FIG. 5, a crimp terminal T1 connected to the electric wire W on the power supply 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 in 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 object, the present invention provides a heat dissipation device according to claim 1, wherein the entire surface is covered with an insulating resin except for one side peripheral edge of the substantially rectangular metal foil having heat conductivity. Sheet is provided, and the insulating resin-covered portion of the heat-dissipating sheet serves as the heat-dissipating portion, and the portion not covered with the insulating resin serves as the caulking portion. When wrapping around the outer peripheral surface of the barrel and mounting the other opposite side protruding toward the wire side, crimp the core wire barrel and the insulation coating barrel to the exposed core wire and insulation coating of the wire respectively Provided is a method for connecting a crimp terminal, which crimps a sheet to a core wire barrel and an insulating coating barrel, and an electric wire.

According to a second aspect of the present invention, there is used a heat dissipation sheet whose entire surface is covered with an insulating resin except for one side peripheral edge of a substantially rectangular metal foil having heat conductivity, and the insulating resin of the heat dissipation sheet is covered. The heat radiating part is the part, and the part not covered with the insulating resin is the caulking part, and the caulking part of the heat radiating sheet is crimped and attached to the outer peripheral surface of the core wire barrel and the insulation coated barrel of the crimp terminal crimped with the wire Along with
The heat dissipation part is extended to the electric wire side and attached, and when the crimp terminal is accommodated in a terminal accommodating chamber such as a fuse box, the end of the heat dissipating sheet is set to be located near the opening end of the terminal accommodating chamber. The connection structure between the crimping fitting and the electric wire is provided.

Aluminum foil, copper foil, or the like is used as the metal foil forming the heat dissipation sheet, and vinyl chloride resin, polyethylene resin, or the like is used as the insulating resin to be coated by the laminating method. Is very thin, 0.1 mm or less, and has the flexibility to easily bend.

[0010]

In the method for connecting a crimp terminal and an electric wire according to claim 1, the heat dissipation sheet is used by cutting a long sheet, and the heat dissipation sheet is crimped and crimped between the crimp terminal and the electric wire. At the same time, since it is only crimped to the outer peripheral surfaces of the core wire barrel and the insulation-coated barrel of the crimp terminal, it does not take time to attach the heat dissipation sheet. Moreover, since it is attached by crimping not only to the core barrel but also to the insulation-coated barrel,
The heat-dissipating sheet does not come off from the crimp terminal and is securely attached.

In the connection structure of the crimp terminal and the electric wire according to claim 2 which are connected by the method according to claim 1,
Since a heat dissipation sheet with good thermal conductivity is attached to the outer peripheral surface of the core wire barrel of the crimp terminal that is connected to the core wire of the electric wire,
The heat locally generated in the electrical connection portion can be conducted to the outside through the heat radiation sheet 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. In addition, since the insulating resin is laminated on the surface of the heat dissipation sheet,
No short circuit will occur by contact with other terminals or parts.

Further, since the heat radiation sheet is a thin and flexible sheet, it is easily bent when the crimp terminal to which the heat radiation sheet is attached is inserted into the terminal accommodating chamber of the fuse box, relay box or connector housing. Therefore, it does not interfere with the insertion of the crimp terminal. Therefore, since the heat dissipation area is increased and the heat dissipation effect is increased, even if the heat dissipation sheet is enlarged, it can be inserted into the terminal accommodating chamber due to bending.

[0013]

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 shows a state in which the heat radiation sheet 1 is attached to the crimp terminal 2 having the female type electric contact portion 2a.
Indicates a heat dissipation sheet 1. The heat radiating sheet 1 is laminated with a vinyl chloride resin film 4 on the entire surface except for one side peripheral edge of the rectangular copper foil 3, and the laminated portion of the heat radiating sheet 1 serves as a heat radiating portion 1a and is not laminated. The part is used as the caulking part 1b.

It is preferable that the heat radiation sheet 1 is formed as a long sheet as shown by the alternate long and short dash line in FIG. The metal foil 3 is not limited to copper foil, and aluminum foil or the like is preferably used as long as it has good thermal conductivity. Similarly, the insulating resin 4 to be laminated is not limited to vinyl chloride resin and polyethylene is used. Resin may be used. Further, although the insulating resin 4 is laminated and covered, the insulating resin may be sprayed onto the surface of the metal foil to cover the surface.

The heat dissipation sheet 1 is attached to the crimp terminal 2 by the method shown in FIG. 4, which will be described later, but when the crimp terminal is attached, the crimped portion 1b which is not laminated is attached to the crimp terminal 2.
The length L1 is set so that the core wire barrel 2b and the insulating coating barrel 2c can be crimped, and when the heat radiating portion 1a is inserted into the terminal accommodating chamber 5 of the fuse box as shown by a dotted line in FIG. The length L2 slightly protruding from the opening end 5a of the accommodation chamber 5 is set. The tip of the heat radiating portion 1b does not necessarily have to project from the opening end 5a, but it is preferable to project it from the opening end 5a to the outside because the heat radiation effect is enhanced.

In the step of crimping the heat radiating sheet 1 to the crimp terminal 2, as shown in FIG. 4, first, the caulking portion 1a of the heat radiating sheet 1 is positioned on the core wire barrel 2b and the insulating coating barrel 2c side of the crimp terminal 2. Let In this state, the core wire 7 exposed by peeling off the insulation coating 6 at the tip of the wire W is used as the core wire barrel 2b.
And the tip of the insulating coating 6 is inserted between the insulating coating barrels 2c.

Then, with the caulking portion 1b of the heat radiating sheet 1 wound around the outer peripheral surfaces of the core wire barrel 2b and the insulation coating barrel 2c, the terminal crimping device 10 together with the heat radiation sheet 1 together with the core wire barrel 2b and the insulation coating barrel 2c. And core wire 7
And crimp crimp to the insulation coating 6. Thus, the electric wire W
At the time of crimping and crimping the crimp terminal 2, the heat radiating sheet 1 is simultaneously crimped, and the heat radiating sheet 1 is simultaneously attached to the crimp terminal 2 connected to the electric wire W as illustrated.

When the heat dissipation sheet 1 is crimped and fixed to the outer peripheral surface of the core wire barrel 2b of the crimp terminal 2 and the outer peripheral surface of the insulating coating barrel 2c as described above, the crimp terminal 2 is formed as shown in FIG.
When it is inserted into the terminal accommodating chamber 5 of the fuse box shown in FIG.
It is in a state of slightly protruding from the open end 5a to the outside.

With the above structure, when the crimp terminal 2 is energized and heat is locally generated at the position of the core wire barrel 2b, it is transmitted to the heat dissipation sheet 1 having good heat conductivity,
Through the heat dissipation sheet 1, heat can be dissipated from the outside of the terminal accommodating chamber 5 into the air. The heat radiation amount varies depending on the size of the heat radiation sheet 1, but for example, approximately 10 judes can be radiated. As a result, it is possible to prevent heat from being accumulated in the inside of the terminal accommodating chamber 5 and being heated. As a result, heating of the crimp terminal 2 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 also possible to prevent softening of the fuse box provided with the terminal accommodating chamber due to heating.

Further, since the heat radiating sheet 1 is made of a flexible thin sheet, it can be inserted into the terminal accommodating chamber 5 while flexing, and the heat radiating sheet 1 having a large area can improve the heat radiating performance. The insertion into the terminal accommodating chamber can be easily performed.

[0021]

As is apparent from the above description, according to the method for connecting a crimp terminal and an electric wire of claim 1 of the present invention, the heat radiation sheet is simultaneously crimped in the step of crimping the crimp terminal and the electric wire. Since the heat dissipating sheet is attached to the crimp terminal, a special work process for attaching the heat dissipating sheet is unnecessary, and the heat dissipating sheet can be attached to the crimp terminal without increasing the number of steps.

According to the connection structure of the crimp terminal and the electric wire of claim 2 which are connected by the method of claim 1, a heat dissipation sheet having good thermal conductivity is crimped onto the core wire barrel of the crimp terminal to be fixed in contact therewith. Therefore, the heat locally generated in the core barrel portion can be radiated to the outside through the heat dissipation sheet, reducing the amount of heat generation and not reducing the maximum energization amount to other parts connected to the load side. The heat effect of can be avoided.

[Brief description of drawings]

FIG. 1 is a perspective view of a connection portion between a crimp terminal and an electric wire according to the present invention.

FIG. 2 is a perspective view of the heat dissipation sheet of FIG.

FIG. 3 is a schematic cross-sectional view showing a state in which a crimp terminal to which the heat dissipation sheet is attached is inserted into a terminal accommodating chamber.

4 (A), (B), (C), and (D) are drawings showing a step of connecting a crimp terminal and an electric wire according to the present invention.

FIG. 5 is a perspective view showing a connection state between a crimp terminal and a tab of a fuse showing a conventional problem.

[Explanation of symbols]

 1 heat dissipation sheet 1a heat dissipation part 1b crimping part 2 crimping terminal 2a electrical contact part 2b core wire barrel 3 metal foil 4 insulating coating 5 terminal accommodating chamber 6 insulating coating 7 core wire

Claims (2)

[Claims] 1. A heat-dissipating sheet whose entire surface is covered with an insulating resin except for a peripheral edge of a substantially rectangular metal foil having thermal conductivity is provided, and the insulating resin-covered portion of the heat-dissipating sheet serves as a heat-dissipating portion. With the part not covered with insulating resin as the caulking part, wrap the caulking part of the heat dissipation sheet around the core wire barrel of the crimping terminal and the outer peripheral surface of the insulating coating barrel, and project the other side opposite to the wire side. When mounting and crimping the core wire barrel and the insulation coating barrel to the exposed core wire and the insulation coating of the wire respectively, at the same time, the heat dissipation sheet is crimped to the core wire barrel and the insulation coating barrel. Method. 2. A heat dissipation sheet is used which is entirely covered with an insulating resin except for one side peripheral edge of a substantially rectangular metal foil having heat conductivity, and the insulating resin covered portion of the heat dissipation sheet is a heat dissipation part and an insulating material. The part not covered with resin is the caulking part,
The crimp terminal of the heat dissipation sheet is crimped and attached to the outer peripheral surfaces of the core wire barrel and the insulation-coated barrel of the crimp terminal crimped and crimped with the electric wire, and the heat dissipation portion is extended and attached to the electric wire side. A structure for connecting a crimping metal fitting and an electric wire, characterized in that the end portion of the heat dissipation sheet is set so as to be located in the vicinity of the opening end of the terminal accommodating chamber when it is accommodated in a terminal accommodating chamber such as a fuse box.