JP4948340B2 - Fusible link - Google Patents

Description

The present invention relates to a fusible link used to quickly shut down and protect a circuit when an overcurrent flows in an electric circuit of an automobile or the like, and particularly protects against a high-temperature arc generated at the time of fusing. Related fusible links.

As a fusible link used in an electric circuit of a conventional automobile or the like, for example, the one described in Patent Document 1 is known.

As shown in the longitudinal sectional view of FIG. 6, the fusible link 50 has a substantially U shape in which a pair of female terminal portions 52 a are located below the housing 51 and a fusing portion 52 b is located above. This is a cartridge type in which a copper fuse element 52 is mounted and the upper part of the housing 51 is sealed with a lid 53. The female terminal portion 52a is connected to the male terminal portion 54 of the counterpart device indicated by a two-dot chain line. Plug it in and use it.

However, as shown in the figure, since the upper end 52c of the female terminal portion 52a is opened in the direction of the fusing part 52b, the fuse element 52 has fusing splashes scattered from the fusing part 52b at the time of fusing the fuse element 52. Or a fusing rod R is fixed to the upper end of the mating male terminal 54, or the open end 52c of the female terminal 52a and the mating male terminal 54
Between the two terminal portions 52c and 54, and it is difficult to replace with a new fusible link 50 after fusing.

Furthermore, in order to pursue the environment and comfort, the rated voltage has been increased from the conventional 12V to 14V, and so-called hybrid vehicles are equipped with a battery with a higher voltage of 42V,
In addition, the volume of the entire control circuit is required to be reduced.

However, when the rated voltage is increased, the arc generated when the fuse element 52 is blown becomes large, and this causes an increase in the amount of blown droplets and flaws R and a spread area thereof.

On the other hand, downsizing of the entire volume of the fusible link 50 must be dealt with by reducing the space around the fusing part 52b or by narrowing the interval between the female terminal parts 52a and 52a. All of these means are to promote the expansion of the scattering region.

Thus, the above-described increase in the rated voltage and the miniaturization of the entire fusible link 50 are as follows.
As a result, an increase in the amount of adhesion of the blown splash and flaw ridge R to the counterpart device terminal portion 54 and firm fixation were caused, making it even more difficult to replace a new fusible link.
JP-A-9-171766 (Claim 1, FIG. 1)

As described above, in the conventional fusible link 50 in the automobile field, despite the various problems described above, the number of electronic components used has increased with the recent increase in complexity of electronic control circuits. The number of fusible links used is increasing more than before.

Therefore, the present invention has been made in order to solve such problems, and has an effectiveness that can effectively prevent adhesion of a fusing metal or fusing rod to a terminal portion at the time of fusing a fuse element with a simple configuration. The purpose is to provide a high fusible link.

(Delete)

In order to solve the above-described problem, the fusible link according to claim 1 is configured such that both ends are terminal portions.
The conductor having a fusing part between the terminal parts is bent into a substantially U shape, and the both end parts are separated by a predetermined distance.
A fuse element formed on a pair of male or female terminal portions opposed to each other;
An opening surrounding the fuse element and inserting the fuse element at one end
A pair of male or female terminal portions of the fuse element is located on the other end.
A housing made of insulating resin and a lid covering the opening surface of the housing.
A fusible link of the fuse element and the pair of male or female
Between the male terminal and the male terminal of the fusing splash at the time of fusing the fuse element,
A shield plate for preventing adhesion to the female terminal portion is provided, and the shield plate is formed integrally with the fuse element, and from the fuse element so as to cover the upper ends of the pair of male or female terminal portions. It is characterized by being extended.

The fusible link according to claim 2 , wherein both ends are terminal portions and a conductor having a fusing portion provided between the terminal portions is bent into a substantially U shape, and the both end portions are separated from each other at a predetermined distance. A fuse element formed in a pair of opposed male or female terminal portions, an opening surface surrounding the fuse element and inserting the fuse element at one end portion, and a pair of the fuse elements at the other end portion are formed. A fusible link comprising a housing made of an insulating resin in which a male or female terminal portion is located, and a lid that covers the opening surface of the housing, the fusing portion of the fuse element, and the pair of male between the shape or female terminal portion is provided with a shielding plate to prevent sticking to the male type or the female type terminal portion of the fusing splash when the fuse element blown, said shielding plate The L-shaped insulating member is integrally formed with the lid and is suspended from the back surface of the lid so as to cover the upper ends of the pair of male or female terminals. To do.

(Delete)

(Delete)

That is, the fusible link of the present invention is a fusible link between the fusing part of the fuse element and the terminal part, and a shielding plate that prevents the molten metal from splashing and fusing soot from adhering to the terminal part when the fuse element is fusing. fuse element link is a component of, or either provided integrally to extend from the lid of the housing, or to these members is obtained detachably attached separately.

(Delete)

(Delete)

(Delete)

According to the fusible link of claim 1, shielding蔽板, together are formed integrally with the fuse element, as to cover the upper end of the pair of male type or the female type terminal unit, extending from said fuse element body Therefore, it is possible to obtain a highly effective fusible link that can effectively prevent the fusing metal or fusing rod from adhering to the terminal portion at the time of fusing the fuse element with a simple configuration.
Moreover, integral molding by press or bending is possible at the time of molding of the male or female terminal portion.

According to the fusible link of claim 2, shielding蔽板it is because it is formed in the lid integral with the separate rather than the fuse element, the other having the effect of fusible link of claim 1 It is easier to manufacture than a fuse element. Moreover, since the material is an insulating member, there is no fear of a short circuit.

(Delete)

(Delete)

  Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS. 1 to 4.

This embodiment is an embodiment of the fusible link according to claim 1 , FIG. 1 is an exploded perspective view of the fusible link 1, and FIG. 2A is a longitudinal section showing a state after the assembly. FIG. 2B is a longitudinal sectional view showing a state when the fuse element 2 in FIG. 2A is melted.

In FIG. 1, the fusible link 1 of this embodiment is roughly divided into a fuse element 2 and
It consists of the structural member of the housing 3 and the cover body 4.

The fuse element 2 is used to protect the electric circuit by fusing when an overcurrent flows. For example, the fuse element 2 is a conductive member made of a metal having a relatively high melting point such as copper. The shape is substantially U-shaped, and a pair of female terminal portions 2a facing each other with an inter-terminal interval P formed between both ends thereof. The fuse element 2 of this embodiment is formed by pressing a thin copper plate into a predetermined female terminal shape and then bending it into a cross-sectional shape shown in FIG. 2 (a). In particular, the pair of terminal portions 2a are illustrated. It is formed in a box shape so as to surround a pair of male terminal portions that are not. The terminal part 2a of the present embodiment is a female terminal part by bending as shown in FIG. 2 (a), but when the mating terminal is female,
Of course, it is a male terminal.

As shown in FIG. 1, from each terminal portion 2a, a narrow fuse portion 2b rises in a substantially U shape, passes through a large-diameter enlarged portion 2c, and the narrowest fusing portion 2d is a terminal portion. It is formed between 2a.

Further, a low melting point metal 2e is welded in a dot shape on the left enlarged portion 2c, and the speed of fusing is realized by alloying the base material with copper. Examples of the low melting point metal 2e include tin, silver, lead, nickel, and alloys thereof.

The shapes of the enlarged portion 2c, the fusing portion 2d, and the low-melting point metal 2e are merely examples and are not limited to these shapes, and can of course be changed to various shapes depending on the breaking conditions. .

As described above, the overall shape of the fuse element 2 is substantially U-shaped, but of course, it may be semicircular or rectangular. The “substantially U-shape” of the fuse element 2 referred to in the present invention is these. It is a broad concept including shape.

By the way, in the fuse element 2 of the present embodiment, when the above-described fusing part 2d is blown, a fusing metal splash or flaw R generated with the arc is formed in the lower female terminal part 2a. When the fusing part 2d melts or adheres to the inner surface of the connection port 2f (the narrowest part of the receptacle of the female terminal 2a, see FIG. 2 (a)), which is the receptacle of the male terminal that does not In order to prevent the fusing rod R hanging downward from the fusing port 2g (see FIG. 2 (b)) from adhering to the connecting port 2f and closing it, the upper end of each terminal portion 2a has a width of W. A shield plate 5 having a length L extends so as to block the connection port 2f of the female terminal portion.

The position where the shielding plate 5 is provided is achieved if it is between the fusing part 2d of the fuse element 2 and the pair of male or female terminal parts 2a, but the female terminal part 2 as in this embodiment.
Providing it close to a is effective for preventing adhesion of the molten metal droplets and the molten iron R to the connection port 2f.

Further, as the shape of the shielding plate 5, the one of this embodiment is a simple plate-like plane,
In order to effectively prevent the molten metal from splashing or the flaw rivet R from adhering to the terminal portion 2a, the entire connection port 2f of the terminal portion 2a, such as the box-shaped female terminal portion 2a of this embodiment, is used. It is preferable to have a shape that surrounds as much as possible without gaps. Therefore, the shape of the shielding plate 5 may be a semicircular shape or a circular shape so as to cover the periphery of the terminal portion 2a, and the “shielding plate” referred to in the present invention is such a two-dimensional or It is a broad concept including three-dimensional shapes. The same applies to Examples 2 and 3 described later.

Further, as described above, the shielding plate 5 of this embodiment is formed integrally with the female terminal portion 2a, but the shielding plate 5 is configured separately from the female terminal portion 2a. For example, you may fix to the female terminal part 2a with suitable engaging means, such as screwing, adhesion | attachment, and fitting. In addition,
Reference numeral 2h is a lance cut and raised from the wall surface of the female terminal portion 2a in order to fix the entire fuse element 2 to the housing 3 described below.

Next, the housing 3 is a box made of an insulating resin for accommodating the entire fuse element 2 therein. The housing 3 surrounds the side surface of the fuse element 2 and has an upper portion for accommodating the fuse element 2. An opening surface 3a is formed, a flange portion 3b that is a joint surface with the lid body 4 to be described later is formed at an opening end thereof, and a crosspiece 3c for preventing displacement from the lid body 4 from the joint surface; A pin 3d is projected.

On the other hand, the bottom 3e (see FIG. 2 (a)) is a joint portion with a mating male terminal (not shown), and has two males (not shown) at an interval that matches the arrangement interval P of the female terminal 2a. A through hole 3f for inserting the shaped terminal portion is formed, and the other portions are closed.

In addition, as shown to Fig.2 (a), the recessed part 3h engaged with the lance 2h of the female terminal part 2a mentioned above is formed in the bottom part of the inner wall face 3g. The cross-sectional shape of the housing 3 is not particularly limited, and can be an appropriate shape corresponding to the shape of the fuse element 2.

Next, the lid 4 is for closing the opening surface 3a of the housing 3, and the material thereof is usually
It is made of transparent synthetic resin so that you can check whether the internal fuse element 2 is blown or not.
At the four corners, through-holes 4a that fit into the pins 3d of the housing 3 are formed. In addition, although the cover body 4 has a thing which can be removed by an appropriate | suitable means to the flange part 3b (FIG. 1) of the housing 3, and a thing which is not so, in this Example, what kind of thing is sufficient. good.

The above-described constituent members are assembled together to form the fusible link 1 of this embodiment, which is a finished product shown in the longitudinal sectional view of FIG. When assembling the above components, the lance of the fuse element 2 is inserted when the terminal portion of the fuse element 2 is inserted downward from the opening surface of the housing 3 and the connection port 2f contacts the bottom surface 3e of the housing 3. 2h engages with the recess 3h of the housing 3 and is fixed integrally.

Finally, the opening surface 3a of the housing 3 is closed by the lid 4 so as to be removable or impossible by an appropriate means such as an adhesion method or a screwing method.

According to the fusible link 1 of the present embodiment described above, as shown in FIG. 2 (b), even in the fusing port 2g of the fuse element 2, the spatter of molten metal droplets or flaws R due to the generation of an arc. Even if drooping occurs, the female terminal portion 2a of this embodiment is blocked by the shielding plate 5 so as to cover the connection port 2f. And prevent entry and attachment to the connection port 2f.

Therefore, the fusible link 1 of the present embodiment, together with its own connection port 2f and the mating terminal portion not shown, is prevented from being soiled, welded, blocked, etc. Exchange can be performed easily. In addition, the life of the counterpart terminal can be greatly extended.

The second embodiment is an embodiment of the fusible link according to claim 2 .

In the first embodiment, the shielding plate 5 is attached to the fuse element 2. However, as shown in FIGS. 3 and 4, the shielding plate 5A of the second embodiment is attached to the lid 4A. This will be described below with reference to these drawings.

Fig.3 (a) is a longitudinal cross-sectional view which shows the completed product after the assembly of the fusible link 1A of a present Example. 3B and 3C, the shielding plate 5A in FIG. 3A is replaced with the housing 3A.
Is a process diagram showing a procedure for moving from the upper side to the appropriate position between the fusing part 2d of the fuse element 2A and the female terminal part 2a (not shown) through the opening surface 3a.
It is the figure seen from X arrow direction. Among these, FIG.3 (b) shows the movement in the middle of the shielding board 5A, (c).
Indicates a state at an appropriate position after movement.

In addition, since the member of the same code | symbol demonstrated in Example 1 is the same thing as the thing of Example 1, description here is abbreviate | omitted.

As shown in FIGS. 3A and 3B, the shielding plate 5A of the present embodiment is an insulating resin member formed integrally with the lid 4A, and the pair of males described in the first embodiment. A plate member having a width W is hung from the back surface of the lid 4A at an arrangement interval P so as to cover the shaped terminal portion (or the female terminal portion), and FIG.
) And FIG. 3 (c), it is formed in a substantially L shape as a whole.

In the present embodiment, the base end portion 5a of the shielding plate 5A is integrally fixed to the back surface of the lid body 4A by, for example, fixing means such as welding and adhesion, and integral forming means such as extrusion molding. As described above, the shielding plate 5A may be configured separately from the lid body 4A, and may be fixed to the back surface of the lid body 4A by appropriate fastening means such as screws, for example. It is included in the concept of “integration” in the embodiments.

On the other hand, the front end portion 5b of the shielding plate 5A is located between the fusing portion 2d of the fuse element 2A and the female terminal portion 2j (see FIG. 3A), and the overall shape is substantially L-shaped. But
It may have a semicircular or other tip shape, and these shapes are also included in the “substantially L-shaped” shape of this embodiment.

In assembling the fusible link 1A of the present embodiment, FIG. 3 (b) and FIG. 3 (c)
Follow the procedure below.

That is, as shown in FIG. 3B, the width W1 of the fusing part 2d of the fuse element 2A is much narrower than the inner width W2 of the opening surface 3a of the housing 3A. The L-shaped tip 5b is inserted from between the inner wall surface 3g of the housing 3A and the fusing part 2d in a state where the entire cover 4A is inclined in the clockwise direction.

Next, the L-shaped tip 5b is further inserted so that the fusing part 2d of the fuse element 2A is scooped up from below, so that the shielding plate 5A does not interfere with the fusing part 2d of the fuse element 2A. Insert at the appropriate position shown in (c).

The above is an example where the material of the shielding plate 5A is formed of a material that does not elastically deform.
If the shielding plate 5A is formed of an elastically deformable material, even if the L-shaped tip portion 5b interferes with the fusing portion 2d of the fuse element 2A, the entire shielding plate 5A has its base end portion 5a.
Since it is elastically deformed clockwise with the vicinity as a fulcrum, it can be set to the appropriate position in FIG. 3C more easily than when the shielding plate 5A is not elastically deformed. Therefore, it can be said that the material of the shielding plate 5A is preferably a material that can be easily elastically deformed, such as a synthetic resin plate, as in this embodiment.

The assembly procedure of the lid 4A in which the shielding plate 5A is integrated is performed after the fuse element 2A is assembled in the housing 3A. As shown in the perspective view of FIG.
First, in a state where the back surface of the fusing part 2d of the fuse element 2A is hooked on the L-shaped shielding plate 5A on the back surface of the lid 4A, the whole is integrated with the housing 3 from the opening surface 3a of the housing 3A.
After inserting the fuse element 2A, the fuse element 2A is further pushed in from above, and the lance 2h of the female terminal portion 2a is engaged with a recess 3h (see FIG. 2 (a)) of the housing 3A for assembly. Also good. Then, the L-shaped shielding plate 5A does not interfere with the fusing part 2d of the fuse element 2A.

The fuse element 2A according to the present embodiment can provide the same operation and effect as those of the first embodiment. In particular, the shielding plate 5A according to the present embodiment has its front end portion 5b surrounding the fusing portion 2d from below. Since it is formed in a substantially L shape, it is possible to effectively prevent the molten metal from being scattered or drooped.
[Reference example]

(Delete)

As shown in FIG. 3A, the above-described second embodiment is the one in which the shielding plate 5A is attached to the lid 4A. The shielding plate of this reference example is shown in the exploded perspective view of FIG. As indicated by reference numeral 5B, it is supported by being engaged with the housing 3B.

That is, the housing 3B of the present reference example is provided with a cross-shaped member 3j as an example of an engaging means of the shielding plate 5B on two opposing inner wall surfaces 3i.

This cross-shaped member 3j is a protruding member having a length P2 along the direction of the inner wall surface 3i slightly shorter than the interval P1 of the female terminal portion 2a of the fuse element 2, and the bottom portion 3e (see FIG. 2A). ) So that the inner wall surface 3i protrudes from the inner wall surface 3i toward the fusing portion 2d of the fuse element 2 at a position between the fusing portion 2d of the fuse element 2 and the female terminal portion 2a.
Are integrally molded.

On the other hand, the shielding plate 5B is a thin insulating plate whose length L2 is slightly shorter than the facing distance L1 between the inner wall surfaces 3i and has a width W3 narrower than the inner dimension of the pair of fuse portions 2b. .

When the fuse element 2 is mounted in the housing 3B, first, the shielding plate 5B
Is inserted and placed between the fusing part 2d of the fuse element 2 and the female terminal part 2a, as shown by the two-dot chain line in the figure. Next, the fuse element 2 is dropped into the housing 3B so that the cross-shaped member 3j enters between the pair of female terminal portions 2a, and the cross-shaped member 3j is bonded and screwed at the position where the back surface of the shielding plate 5B is lifted. The shielding plate 5B is attached to the crosspiece-like member 3 by an appropriate fixing means such as
Fix on j.

Any means may be used as the fixing means for the cross-shaped member 3j. In addition to the above means, for example, fitting may be used.

In this reference example , the cross-shaped member 3j is integrally formed on the inner wall surface 3i of the housing 3B.
It may be separately provided and fixed to the inner wall surface 3i by an appropriate fixing means. If there is a physical space between the housing 3B and the fuse element 2, an appropriate support member may be raised from the bottom 3e (see FIG. 2A) toward the fusing part 2d to support the shielding plate 5B. .

Thus, even if the shielding plate 5B is supported by an appropriate member from the inner wall surface 3i or the bottom 3e of the housing 3B between the fusing part 2d of the fuse element 2 and the female terminal part 2a, the female terminal part 2a It is possible to effectively prevent the molten metal from being scattered or drooped.

1 is an exploded perspective view of a fusible link according to a first embodiment of the present invention. 2A is a longitudinal sectional view showing a state in which the constituent members of the fusible link of FIG. 1 are assembled, and FIG. 2B is a longitudinal sectional view showing a state in which the fuse element therein is melted. It is a figure explaining the effect | action and effect of invention. FIG. 3A is a longitudinal sectional view of a fusible link according to the second embodiment of the present invention. 3 (b) and 3 (c) are process diagrams showing a procedure for setting the shielding plate in FIG. 3 (a) to an appropriate position of the fuse element, both of which are viewed from the direction of arrows XX. It is a figure. Of these, FIG. 3 (b) is before setting, and FIG. 3 (c) is after setting. It is a perspective view which shows another example of the assembly procedure of the fusible link of FIG. It is a disassembled perspective view of the fusible link which concerns on the reference example of this invention. It is a longitudinal cross-sectional view of the conventional fusible link.

1, 1 A fusible link (present invention)
1B fusible link (reference example)
2, 2A fuse element 2a female terminal portion 2b fuse portion 2c enlarged portion 2d fusing portion 2e low melting point metal 2f connection port 2g fusing port 2h lance 3, 3A, 3B housing 3a opening surface 3b flange portion 4, 4A lid 5, 5A, 5B Shielding plate P Inter-terminal spacing R Fused metal splashes and flaws L Shielding plate length W Shielding plate width

Claims (2)

Bending the conductor in which both end portions are terminal portions and a fusing portion is provided between the terminal portions into a substantially U shape,
The fuse elements formed on a pair of male or female terminal portions facing each other with a predetermined distance between the both ends; and
A housing made of an insulating resin surrounding the fuse element and having an opening surface into which the fuse element is inserted at one end and a pair of male or female terminal portions of the fuse element at the other end,
A fusible link comprising a lid that covers the opening surface of the housing;
Provided between the fusing part of the fuse element and the pair of male or female terminal parts is a shielding plate that prevents fusing droplets from adhering to the male or female terminal part at the time of fusing the fuse element. ,
The fusible link , wherein the shielding plate is formed integrally with the fuse element and extends from the fuse element so as to cover the upper ends of the pair of male or female terminal portions . Bending a conductor in which both end portions are terminal portions and a fusing portion is provided between the terminal portions into a substantially U shape,
The both end portions are formed on a pair of male or female terminal portions facing each other at a predetermined distance.
Fuse element,
Enclose the fuse element and open the fuse element at one end.
A mouth surface is formed, and a pair of male or female terminal portions of the fuse element is positioned at the other end.
A housing made of insulating resin,
A fusible link comprising a lid that covers the opening surface of the housing;
Between the fused portion of the fuse element and the pair of male or female terminal portions, the front
When the fuse element is blown, adhere to the male or female terminal part.
Provide a shielding plate to prevent,
The shielding plate is a substantially L-shaped insulating member that is integrally formed with the lid and is suspended from the back surface of the lid so as to cover the upper ends of the pair of male or female terminal portions. A fusible link characterized by that.

Images