JP2825470B2 - Installation method of pressure welding fuse - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for mounting a pressure welding fuse for preventing an overcurrent from flowing in an electric circuit.

[0002]

2. Description of the Related Art As a conventional method of mounting a fuse of this type, for example, there is a method shown in FIG.
-109156). That is, the fuse 1 has a fuse portion 7 formed by etching or the like a circuit 5 made of a soluble conductor suitable as a fuse material on both front and back surfaces of a substrate 3 formed of a thermosetting resin such as a phenol resin. Things. The surface of the circuit 5 is plated with tin (Sn) to a predetermined thickness in order to improve electrical characteristics.

[0003] As shown in FIG. 10, such a fuse 1 is inserted into a hollow portion 11 of an insulating casing 9, and a spring piece 13 a of a terminal 13 inside the casing 9 is pressed against the surface of the circuit 5. In this case, conduction is performed.

[0004]

However, in such a conventional fuse 1, since the substrate 3 is made of an extremely hard material such as a thermosetting resin, the fuse 1 is connected to a slot of a press-contact terminal (not shown). Substrate 3
The circuit 5 on the front surface may be strongly rubbed in the slot portion, and the plating of the circuit 5 may be peeled off, thereby causing a problem that conduction reliability is reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for mounting a pressure welding fuse which can improve conduction reliability.

[0006]

According to a first aspect of the present invention, a fuse pattern and a flexible electrical connection portion are formed on a surface of a substrate, and the substrate is pressed against the substrate at the electrical connection portion. A method of mounting a pressure welding fuse to be inserted and pressure-contacted into a pressure-contact slot of a terminal, wherein the substrate is formed of an elastic material, and the substrate is inserted and pressed into the pressure-contact slot to include the electrical connection portion of the substrate. A concave portion is formed on the surface to surround the edge of the press-connecting slot.

According to a second aspect of the present invention, there is provided a method for mounting a press-contact fuse in which a fuse pattern and an electric connection portion are formed on a surface of a substrate, and the substrate is inserted and pressed into a press-contact slot of a press-contact terminal at the electric connection portion. Wherein at least the thickness of the substrate of the electrical connection portion is formed smaller than the width of the pressure contact slot, and the sum of the thickness of the layer of the electric connection portion on the surface and the thickness of the substrate is larger than the interval of the pressure contact slot. And pressing the substrate into the press-contact slot to form a recess surrounding the edge of the press-contact slot on the surface of the electrical connection portion.

[0008]

According to the first aspect of the present invention, since the substrate has elasticity, the force acting on the electric connection portion when inserted into the press contact slot can be reduced, and the separation of the electric connection portion can be eliminated. It is possible to improve conduction reliability. In addition, a concave portion surrounding the edge of the press contact slot can be formed on the surface of the substrate including the electrical connection portion.

According to the second aspect of the present invention, when the electric connection portion is inserted into the press-contacting slot, the electric connection portion is inserted and pressed while shaving the surface of the electric connection portion. At this time, since the thickness of the board is smaller than the width of the press-connecting slot, the electrical connection portion reliably remains between the board and the press-connecting slot. In addition, a concave portion surrounding the edge of the press-contact slot can be formed in the electric connection portion.

[0010]

Embodiments of the present invention will be described below.

FIGS. 1 and 2 show a pressure welding fuse 21 according to a first embodiment.
And a case 27 attached to the substrate 25.

In this embodiment, the substrate 25 is provided as shown in FIG.
As shown in the figure, by using elastic material such as liquid crystal polymer,
It is formed in a rectangular shape having a predetermined thickness, and electrical connection portions 29a and 29b are formed on both sides of the surface, and a fuse pattern 30 having a fuse function of a predetermined electrical capacity is etched between the electrical connection portions 29a and 29b. It is formed by processing.

The electric connection portions 29a and 29b and the fuse pattern 30 have tin (Sn) plating with a predetermined plating thickness (for example, 5 μm or more).

The case 27 is formed of a transparent synthetic resin or the like, and is attached to the substrate 25 so as to expose the electric connection portions 29a and 29b on both sides and cover the fuse pattern 30, so that the fuse pattern 30 is visible from the outside. It has become. The attachment of the case 27 to the substrate 25 is performed as follows. That is, a plurality of (two in this embodiment) projections 33 are provided inside the case 27, the projections 33 are inserted into the engagement holes 35 provided in the substrate 25, and the upper portion 27a of the case 27 is fixed by welding or the like. ing.

As shown in FIG. 1, the press contact terminals 39a, 39
b is, for example, a bus bar 23a of a junction box,
23b.
a, 37b. The widths of the press contact slots 37a, 37b are formed to be slightly narrower than the electric connection portions 29a, 29b.

In the above configuration, the electric connection portions 29a and 29b of the press-contact fuse 21 are connected to the press-contact slots 37a and 37a, respectively.
37b, the two terminals 39a, 3
9b can be electrically connected via the pressure welding fuse 21.

In this embodiment, since the substrate 25 itself has elasticity, the rigid press contact slots 37a,
When the substrate 25 is pressed against the contact 37b, the substrate 25 slightly bends as shown in FIG.
The plating layers 7a and 37b do not rub strongly, so that peeling of the plating layer can be prevented and conduction reliability can be improved. In addition, a concave portion surrounding the edges of the press contact slots 37a, 37b can be formed on the surface of the substrate 25 including the electric connection portions 29a, 29b, and the electric connection portions 29a, 29b can be formed.
While increasing the contact area between the press-contact slots 37a and 37b and the press-contact slots 37a and 37b, the relative movement of the press-contact slots 37a and 37b in the thickness direction is regulated, and extremely high conduction reliability can be obtained.

Next, a second embodiment will be described with reference to FIGS. The same components as those in the above-described embodiment are denoted by the same reference numerals, and redundant description will be omitted.

The substrate 41 of the pressure welding fuse 40 of this embodiment
Is made of a thermosetting resin, unlike the above embodiment.

In this embodiment, as shown in FIGS. 5 and 6, the thickness T 'of the substrate 41 is smaller than the width T of the press contact slots 37a and 37b of the press contact terminals 39a and 39b (T'<
T) is formed. Further, the electric connection portions 29a, 29b
Tin (Sn) plating 43 thickness T ₀ after applying, i.e., the thickness T ₀ which plus the thickness of the plating thickness and the substrate 41, the insulation displacement slots 37a, larger than the width T of 37b (T < T ₀ ). That is, as the thickness T'and the insulation displacement slots 37a of the substrate 41, the width T of 37b, electrical connections 29a, the relationship between the thickness T ₀ of the 29 b, a relationship of T'<T <T ₀ It is configured.

Therefore, the electric connection portions 29a, 29 of the substrate 41
9b is connected to the press-fitting slots 37 of the press-connecting terminals 39a and 39b.
As shown in FIG. 7, when inserting and press-contacting the electrical connection portions 29a and 29b, the tin (Sn) plating 43 of the electrical connection portions 29a (29b) is inserted while being scraped off. Are inserted and pressed into the press-contact slots 37a and 37b as shown in FIG.

Therefore, the plating layers of the electric connection portions 29a and 29b surely remain, and the electric connection portions 29a and 29b
In this state, the pressure contact slots 37a and 37b fit into the recesses formed in the groove b, so that the contact area can be reliably increased, the relative movement is suppressed, and extremely high conduction reliability can be obtained.

According to this embodiment, a hard material such as a thermosetting resin can be used for the substrate 41 as in the prior art.

[0024]

As described above, when the board is inserted and pressed into the press-connecting slot at the electric connection portion, the first aspect of the present invention is described.
According to the invention, the substrate and the electric connection portion are bent, and in the invention of the second aspect, the electric connection portion is shaved, so that a concave portion surrounding the edge of the press-contact slot is formed, and extremely high conduction reliability is obtained. Becomes possible.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment in relation to a press contact terminal.

FIG. 2 is an exploded perspective view of a pressure welding fuse.

FIG. 3 is an enlarged perspective view of a main part of the substrate.

FIG. 4 is an operation explanatory view.

FIG. 5 is a perspective view according to a second embodiment.

FIG. 6 is an explanatory diagram of a main part showing a second embodiment.

FIG. 7 is an operation explanatory view of the second embodiment.

FIG. 8 is an operation explanatory view of the second embodiment.

FIG. 9 is a front view showing a conventional fuse.

FIG. 10 is a front view of a casing into which a fuse is pressed.

[Explanation of symbols]

 21, 40 Pressure welding fuse 25, 41 Substrate 29a, 29b Electrical connection 30 Fuse pattern 37a, 37b Pressure welding slot 39a, 39b Pressure contact terminal

Claims (2)

(57) [Claims] 1. A method of mounting a press-contact fuse, wherein a fuse pattern and a flexible electric connection portion are formed on a surface of a substrate, and the substrate is inserted and pressed into a rigid press-contact slot of a press-contact terminal at the electric connection portion. Forming the substrate from an elastic material, and inserting and pressing the substrate into the pressure-contact slot to form a recess surrounding the edge of the pressure-contact slot on the surface of the substrate including the electrical connection portion. A method for mounting a pressure welding fuse, characterized by the following. 2. A method according to claim 1, wherein a fuse pattern and a scrapable electrical connection portion are formed on the surface of the substrate, and the substrate is inserted and pressed into a hard pressure contact slot of a pressure terminal at the electrical connection portion. The thickness T 'of the substrate is formed at least at the electrical connection portion to be smaller than the width T of the press-connecting slot, and the sum T ₀ of the thickness of the electrical connection portion layer and the thickness T' of the substrate is formed on the surface. By forming the substrate so as to be larger than the interval between the press contact slots and inserting and pressing the substrate into the press contact slots, a concave portion surrounding the edge of the press contact slot is formed on the surface of the electric connection portion. Characteristic mounting method of pressure welding fuse.