JPH08222285A - Connecting structure of terminal metal fitting and electric wire - Google Patents

Abstract

PURPOSE: To prevent heating of a fuse box or the like in which a a terminal metal fitting and a terminal housing chamber are arranged by radiating heat generated in the terminal metal fitting and an electric wire connecting part. CONSTITUTION: A cylindrical heat radiating cover 1 to surround a connecting part between a terminal metal fitting 2 and an electric wire W is formed of a layered material composed of a heat conductive metallic material 1d and insulating resin material 1e covering its surface. A fixing part 1a from which the insulating resin material is removed is arranged on one end of this heat radiating cover, and this fixing part is fixed to an electric wire connecting position of the terminal metal fitting by soldering or ultrasonic welding or electric resistance welding. When this terminal metal fitting is housed in a terminal housing chamber of a fuse box or the like, the other end of the heat radiating cover is projected outside from the opening end of the terminal housing chamber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for connecting a terminal fitting such as a crimp terminal to an electric wire, and more particularly to a connecting portion between a terminal fitting for a large current mounted in a fuse box and the electric wire. It is intended to effectively dissipate heat in the connection 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 equipped with a terminal fitting such as a crimp terminal or a pressure contact terminal at its tip and is mated with a mating terminal fitting to be connected. For example, when a crimp terminal is attached, the insulation coating on the tip of the wire is stripped to expose the core wire, and the core wire is caulked and connected to the core wire barrel of the crimp terminal. The exposed core wire may be fixed to the terminal fitting by soldering.
Further, when connecting to the pressure contact terminal, the insulating coating is cut by the blade portion of the pressure contact terminal to connect the blade portion to the core wire.

The terminal fitting 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]

In the case of the connecting portion between the core wire of the electric wire and the terminal fitting, for example, a crimp terminal, heat is likely to be locally generated around the crimped portion of the core wire by the core 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 radiates the heat locally generated at the connecting portion between the terminal fitting 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 metal material having thermal conductivity according to claim 1.
A cylindrical heat dissipation cover surrounding the connection between the terminal fitting and the electric wire was formed of a laminated material composed of an insulating resin material coated on the surface, and the insulation resin material was removed at one end of the heat dissipation cover. The fixing portion is provided, and the fixing portion is fixed to the wire connection position of the terminal fitting by soldering, ultrasonic welding, or electric resistance welding, and the heat radiation cover when the terminal fitting is housed in a terminal housing chamber such as a fuse box. Is provided so that the other end thereof is located in the vicinity of the open end of the terminal accommodating chamber.

Aluminum, copper, steel plate or the like is used as the metal material forming the heat dissipation cover, and vinyl chloride resin, polyethylene resin or the like is used as the insulating resin material. The metal material and the insulating resin material are used. The thickness of the laminated material is less than or equal to the thickness of the metal material forming the terminal fitting and is 0.5 mm or less.

Further, in claim 2, the heat radiation cover is
A flat-plate-shaped laminated material having rigidity is formed into a curved tubular shape, and a skirt-shaped connection structure is provided in which the diameter is expanded from the fixed portion at the one end to the other end.
Even in the case of the skirt shape, the heat radiation cover is set to a size that can be inserted into the terminal housing chamber of the fuse box, the relay box or the connector housing.

Further, according to a third aspect of the present invention, the terminal fitting is a crimp terminal, and the fixing portion of the heat radiation cover is fixed to the outer peripheral surface of the core wire barrel of the crimp terminal by soldering. There is provided a connection structure with a wire of a terminal fitting, the end of which is set to slightly project from the open end of the terminal accommodating chamber. The terminal fittings connected to the electric wire are not limited to the above-mentioned crimp terminal, and the heat radiation cover is attached to the electric wire connecting portion even for the pressure contact terminal and those which are fixed to the core wire exposed from the electric wire by soldering. It is possible to dissipate the heat generated in the.

[0011]

In the connection structure of the terminal metal fitting and the electric wire according to the above-mentioned claim 1, since the heat dissipation cover having good thermal conductivity is attached to the connection portion between the core wire of the electric wire and the terminal metal fitting, the connection portion is locally formed. The heat that is generated can be radiated to the outside from the opening side of the terminal accommodating chamber by conducting through the heat radiating cover. As a result, the terminal fitting becomes highly heated due to heat generation, the maximum amount of electricity is reduced, and it is possible to prevent the thermal influence due to the reduction in the amount of electricity 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 insulating resin layer is present on the surface of the heat dissipation cover, there is no problem such as short circuit.

If the heat dissipation cover is made rigid as described in the second aspect, the fixing work with the terminal fitting by soldering, ultrasonic welding, electric resistance welding or the like can be stably performed. In addition, if the skirt shape widens toward the opening side of the terminal accommodating chamber, the area of the heat dissipation cover can be increased,
To that extent, heat dissipation can be improved.

When the terminal fitting is a crimp terminal as described in claim 3, in particular, the area of the core wire barrel to be crimped by crimping with the core wire of the electric wire is small, the resistance value in the core wire barrel portion becomes high, and the local heat generation occurs. Therefore, if the heat dissipation cover is fixed to the outer peripheral surface of the core barrel by soldering, the heat locally generated can be efficiently dissipated, and the heat generated from the core barrel can be reduced.

[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 shows a heat radiating cover 1, and FIG. 2 shows a state in which the heat radiating cover 1 is fixed to a crimp terminal 2 having a female type electrical connecting portion 2a. The heat radiating cover 1 is formed by bending a flat plate into a tubular shape. A fixing portion 1a including a small-diameter cylindrical portion is provided at one end in the length direction, and a skirt portion 1c whose diameter is expanded from the fixing portion 1a to the other end 1b. I am trying. The diameter of the heat-dissipating cover 1 is set so that it can be inserted into the terminal accommodating chamber 3 of the fuse box shown by the dotted line in FIG. 1, and the other end 1b is longer than the opening end 3a of the terminal accommodating chamber 3. The length is set to slightly project. The other end 1b of the heat radiation cover 1 does not necessarily have to project from the opening end 3a, but it is preferable to project it from the opening end 3a to the outside because the heat radiation effect is enhanced.

As shown in FIG. 3, the heat dissipation cover 1 is made of a laminated material in which one surface of a metal material 1d made of a copper plate is coated with an insulating resin material 1e made of vinyl chloride resin.
As described above, although the laminated material is curved to have a cylindrical shape, the insulating resin 1e has a cylindrical shape and the insulating resin 1e is located on the outer peripheral surface, and the insulating resin 1e on the surface of the fixing portion 1a at one end is It is removed so that the soldering described later can be performed. The metal material 1d is not limited to a copper plate as long as it has good thermal conductivity, and the insulating resin
e is not limited to vinyl chloride resin.

In the step of fixing the heat radiation cover 1 to the crimp terminal 2, as shown in FIG.
Attached. Then, the insulation coating 4 on the tip of the wire W
The core wire barrel 2b of the crimp terminal 2 is caulked and crimped onto the exposed core wire 5 and the insulation coating barrel 2c of the crimp terminal 2 is caulked and crimped onto the insulation coating 4 of the electric wire W to be attached. Then, the heat dissipation cover 1 previously attached to the electric wire W is covered on the crimp terminal 2 side.

The fixing portion 1a of the heat radiation cover 1 has a crimp terminal 2
The heat radiation cover 1 is stopped at a position where it is fitted onto the outer peripheral surface of the core wire barrel 2b, and the fixing portion 1a and the core wire barrel 2b are fixed to each other by the solder 11 using the soldering machine 10. The heat radiating cover 1 is attached to the connecting portion between the electric wire W and the crimp terminal 2 in a state where the fixing portion 1a at the tip thereof is fixed to the core barrel 2b and surrounds the insulating coating barrel 2c and the end portion of the electric wire W.

When the heat radiation cover 1 is fixed to the outer peripheral surface of the core barrel 2b as described above, when the crimp terminal 2 is inserted into the terminal accommodating chamber 3 of the fuse box shown in FIG. The other end 1b of the terminal 1 is slightly projected from the opening end 3a of the terminal accommodating chamber 3 to the outside.

With the above construction, 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 cover 1 having good heat conductivity,
Heat can be radiated from the outside of the terminal accommodating chamber 3 into the air through the heat radiating cover 1. The heat radiation amount varies depending on the size of the heat radiation cover 1, but for example, approximately 10 judes can be radiated. As a result, it is possible to prevent heat from being accumulated and heated inside the terminal accommodating chamber 3. 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.

The present invention is not limited to the above-mentioned embodiment, and even when the terminal fitting is a pressure contact terminal, if the fixing portion 1a of the heat radiating cover 1 is fixed near the pressure contact blade for pressure contact with the core wire of the electric wire,
It is possible to obtain the same heat dissipation effect as in the above embodiment. Further, the fixing of the terminal fitting and the heat radiation cover is not limited to solder, and ultrasonic welding, electric resistance welding, or the like can be used.

[0021]

As is apparent from the above description, according to the connection structure of the terminal fitting and the electric wire of claim 1 of the present invention, the heat dissipation cover having good thermal conductivity is fixed to the electric wire connecting portion of the terminal fitting. Therefore, the heat generated at the connection portion can be radiated by the heat radiation cover, the heat generation is reduced, the maximum energization amount is not reduced, and the thermal influence on other components connected to the load side can be avoided. .

Further, according to the structure of claim 2, since the heat radiation cover has rigidity, the fixing work with the terminal fitting can be stably performed, and the skirt that spreads toward the opening side of the terminal accommodating chamber. With the shape, the area of the heat dissipation cover can be increased, and the heat dissipation can be improved accordingly. Further, according to the structure of claim 3, the heat from the core wire barrel of the crimp terminal, which is particularly apt to generate heat, can be efficiently radiated,
When connected to the tab of a fuse having a large amount of electricity, the fuse box can be prevented from being heated.

[Brief description of drawings]

FIG. 1 is a perspective view of a heat dissipation cover used in the present invention.

FIG. 2 is a cross-sectional view showing a state in which the heat dissipation cover of FIG. 1 is attached to a crimp terminal.

FIG. 3 is a cross-sectional view of a laminated material forming a heat dissipation cover.

4 (A), (B), (C), and (D) are drawings showing a process of attaching a heat dissipation cover.

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 cover 1a Fixed part 1b Other end 1c Skirt part 1d Metal material 1e Insulating resin material 2 Crimp terminal 2a Electrical connection part 2b Core wire barrel 3 Terminal accommodating chamber 4 Insulation coating 5 Core wire

Claims (3)

[Claims] 1. A cylindrical heat dissipation cover surrounding a connection between a terminal fitting and an electric wire is formed of a laminated material composed of a metal material having thermal conductivity and an insulating resin material coated on the surface thereof. A fixing portion from which the insulating resin material has been removed is provided at one end of the heat dissipation cover, and the fixing portion is fixed to the wire connecting position of the terminal fitting by soldering, ultrasonic welding, or electric resistance welding, and the terminal fitting is fused. A connection structure between a terminal fitting and an electric wire, characterized in that the other end of the heat dissipation cover is set so as to be located in the vicinity of the open end of the terminal housing chamber when housed in a terminal housing chamber such as a box. 2. The heat dissipation cover is formed by bending the laminated material having a flat plate shape into a cylindrical shape.
The connection structure between a terminal metal fitting and an electric wire according to claim 1, wherein the terminal metal fitting and the electric wire have a skirt shape in which a diameter is expanded from the fixing portion at the one end toward the other end. 3. The terminal fitting comprises a crimp terminal, and a fixing portion of the heat radiation cover is soldered and fixed to an outer peripheral surface of a core barrel of the crimp terminal, and the other end of the heat radiation cover is accommodated in the terminal. The connection structure for connecting an electric wire of a terminal fitting according to claim 1 or 2, wherein the terminal fitting is set to project slightly from the open end of the chamber.