JPS61142622A - Multipolar fuse terminal with diode - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Object of the Invention] The present invention relates to a multi-pole fuse terminal with a diode, and in particular, the structure of a fuse element having a fusing part, a branch part connected and fixed thereto, etc. The present invention has been improved to make it possible to easily produce a multi-electrode terminal with a diode that has high productivity, a large heat dissipation effect, and stable fusing characteristics.

Two types of fuses have traditionally been used in large quantities to prevent burnout due to overcurrent and overload in various automotive electrical components and wire harnesses: blade-type fuses and multi-pole fuse terminals. It is a seed.

As shown in Fig. 13.14, the blade-type fuse connects the upper parts of opposing end surfaces of a pair of opposing male terminals 1, 1 to each other via bulging parts 2, 2 at a fusing part 3 with a very small cross-sectional area. It has a substantially H-shaped shape, and is formed integrally by punching from a fuse metal plate, and is attached to a housing 4 made of an insulating synthetic resin.

The multipolar fuse terminal is also integrally formed by punching out of a metal plate as shown in FIGS. 15 to 18.

That is, the multi-pole fuse element a shown in FIG. 15 includes a branching link 6 connected to a connecting link 5 by a vertical connecting piece 5a, input terminal links 7 protruding from this link 6 at regular intervals, and a plurality of fuses. It consists of element 8. One end of the fuse element 8 is connected to the branching link 6 by a fusing portion 8a having a small cross-sectional area, and the other end is connected to the adjacent input terminal link 7 and the fuse element 8 by a horizontal connecting piece 8b.

That is, the conventional multi-pole fuse element a has a configuration in which the fusing portions 8a of a plurality of fuse elements a are coupled to the branching link 6 coupled to the input terminal link 7, and the input terminal-branching portion-fuse The parts are integrated. However, the branching link 6 and the horizontal connecting piece 8b are
If it is cut in two parts, a multipolar fuse element with one, two, or three poles can be obtained.

In order to connect the multi-pole fuse element a to an electronic device or the like, a plurality of external connection terminals 10 connected to the connecting link 9 are connected to the input terminal link 7 to the fuse element 8, respectively, as shown in FIG. If they are stacked and connected, it becomes a plug-in type multi-polar fuse terminal, and when a diode chip 11 is interposed between the terminal 10 and the fuse element 8, it becomes a multi-polar fuse terminal with a diode. FIG. 19 shows a state in which this terminal is attached to the housing 12.

Although the blade-shaped fuse described above can be continuously molded in a chain both vertically and horizontally, since a pair of opposing male terminals form an H-shaped structure, it is structurally independent as a single fuse. , cannot be used for branch circuits with common poles.

On the other hand, in the case of a multi-pole fuse terminal, the number of poles can be freely selected by changing the cutting part of the branching link 6, etc., but if only one or two pole fuses are left, a large portion is wasted.

In addition, in order to reinforce the fusing part 8a, which is easily cut and deformed, from the side, there is a method of providing a protruding part 7a on the input terminal link 7, which is a common part, as shown in Fig. 16, but this method lacks mass productivity and increases cost. becomes.

Furthermore, the multi-pole fuse terminal has the following problems due to its structure in which the input terminal, the branch section, and the fuse section are integrally formed.

That is, as shown in FIG. 20, fuse blowing portions 8a198a2 on the left and right from the input terminal link 7.

Since the distances up to 8as cannot be made equal, the resistance values up to each fusing part are different, and the fusing characteristics vary between fuses. Since the fusing part 8a and the input terminal link 7 are located on the same plane and at the same interval, when cutting the fusing part 8a with a milling cutter or the like to make the cross-sectional area of the fusing part 8a very small, the input terminal link 7 is also connected to the fuse element a. It will be cut at the same time. Therefore, the plate thickness of the input terminal link 7 becomes thinner, which greatly hinders the heat transfer (heat radiation) effect toward the external connection terminal side, promotes heat generation, and further deteriorates mechanical strength such as vibration resistance. Furthermore, since the structure is such that a plurality of fuse elements 8 are arranged in series on the left and right sides of one input terminal link 7, it is impossible to freely change the capacity of the input terminal link 7 as the number of poles increases or decreases. Yes, if the fuse capacity or number of poles changes,
The specifications of the entire fuse terminal must be changed. Furthermore, when the diode chip 11 is interposed between the fuse element 8 and the terminal 10 as shown in FIG. 18, the fusing part 8a must also be passed through a high-temperature firing furnace in order to solder this part. . Therefore, the fuse alloy is heated to a temperature above its transformation point, and its initial characteristics change.

In addition, although the fusing portion 8a is a small piece with a small cross-sectional area and easy to cut, it is exposed to the outside like the input terminal link 7, so it is susceptible to external forces such as touching other equipment during the assembly process. It is completely defenseless, easily deformed, and there is a risk of short-circuiting to the adjacent fusing part.

Furthermore, in the case of a fuse terminal with a diode attached to the housing 12 as shown in FIG.
1 is sealed and fixed with epoxy resin 12a or the like. Therefore, the structure makes it difficult for the heat generated in this part to be transferred (radiated) to the adjacent terminals and resin, and the temperature easily rises.

Moreover, since the structure is such that the fusing part 8a is interposed between the chip 11 and the input terminal link 7, the heat generated in the chip 11 is cut off by the fusing part 8a, and the heat dissipation effect by the connecting link 5 can hardly be expected. Can not.

Problems to be solved As mentioned above, the conventionally known techniques have the following problems.

(1) Blade-type fuses cannot be multi-polarized and are not suitable for use in multi-branch circuits that have a common pole.

(2) Even if it is a multi-pole fuse terminal, in a structure in which output terminals (fuse elements) having an input (input terminal link) and a fuse (fusion part) are arranged in a chain in a branch part (branching link), There is a lot of waste and lacks mass productivity.

(3) The resistance value from the input terminal to the fuse differs, and the fusing characteristics between each fuse vary.

(4) Like the fusing part, the input terminal is also cut with a milling cutter or the like and becomes thin, which impedes the heat dissipation effect and deteriorates the mechanical properties.

(5) When a diode chip is soldered at high temperature, the initial characteristics of the fused portion change.

(6) There is a risk that the fused part will be exposed to the outside and cause deformation or short circuit.

(7) Heat generated in the diode chip portion is difficult to remove, and heat accumulation adversely affects the fusing characteristics of the fusing portion.

SUMMARY OF THE INVENTION An object of the present invention has been made to solve the above-mentioned problems, and is to provide a multi-pole terminal with a diode that has high productivity, a large heat dissipation effect, and stable fusing characteristics.

[Structure of the invention]

SUMMARY OF THE INVENTION The present invention provides a plurality of fuse elements arranged in parallel at predetermined intervals, each having a fusing part with a small cross-sectional area in the center, and having through holes on both sides of this fusing part. A multipolar fuse element is formed by integrally punching out a connecting part that partially connects adjacent fuse elements to hold all the fuse elements in a flat shape from a fuse metal plate, and A branch part having a U-shaped cross section having a width corresponding to two or more of the fuse terminals that are adjacent to each other and extending in the direction of the input terminal is provided at the terminal, and further, both ends of the two or more of the fuse elements are provided. A reinforcing body made of synthetic resin is formed between the support plates for the parts, and has partition walls inserted between adjacent fuse elements, and the support plates are provided with protrusions for fixing the fuses to the through holes, and the two or more fuse elements are A fuse fixing protrusion is passed through the through hole to fix the fuse element to the reinforcing body, and one end of the two or more fuse elements is connected to an output terminal, and the other end is connected to the seat of the branch part via a diode. After the connection of the input terminal and/or the output terminal is fixed, the connected portion is cut and removed to make the adjacent output terminals independent.

The fuse element (fuse part) that makes up the working fuse terminal is made up of a separate member from the input terminal and the branch part, and in relation to the fuse elements adjacent to each other, they are partially connected and formed in a chain. Therefore, the fuse terminal can be freely selected and used according to the number of poles of the intended fuse terminal without waste, and productivity can be improved.

In addition, the seat of the branch part provided on the input terminal is U-shaped, and the input terminal and fuse part are arranged so as to overlap in the vertical direction, so there is no restriction by the fuse element or input terminal, and the seat is wide. You can take the area. As a result, the distances from the input terminals to the fuse elements are approximately equal and the resistance value is constant, making it possible to provide a stable multi-pole fuse with no variation in blowing characteristics.

Further, the fuse element is connected and fixed to a branch with a large area, and the diode is connected between this branch and the fuse element.
Since it is fixed, the heat generated in the diode and the fusing part is quickly dissipated through the branch part. Moreover, the fuse element is supported and strengthened by the reinforcing body, and the fusing part does not need to be sealed and fixed with resin as in the conventional case when mounted on the housing, and the heat dissipation effect is improved. Also,
Since the fused portion is isolated by the partition wall of the reinforcing body, it is difficult to receive external force, and there is no risk of short-circuiting to adjacent fuse elements or deformation or damage during assembly work.

Other effects will become clear from the description below.

Hereinafter, the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a perspective view of a multipolar fuse element A.

This fuse element A is Cus Ti5AI Mg.

A fuse metal plate material made of an alloy such as Zn is cut to an element thickness using a cutting whetstone or a milling blade, and then formed into a chain shape by punching. A plurality of fuse elements 14 are arranged in parallel at predetermined intervals via vertical connection pieces 15. Note that the connecting portion that partially connects the plurality of fuse elements 14 and holds them in a planar shape is not limited to the connecting link 13 or the vertical connecting piece 15, and for example, a horizontal connecting piece as shown in FIG. 15 may be used. You can also do this.

At the center of the fuse element 14, a fusing section 14a having a small cross-sectional area is provided in an S-shaped bent state, and through holes 14b are bored at both remaining ends. The bent shape of the fusing part 14a is a rectangular wave shape, as shown in FIGS.
Various shapes can be selected, such as N-shape and wavy shape.

3 to 10 are perspective views showing a multipolar fuse element stamped from a thin fuse metal plate having the same plate thickness as the element and its assembled state.

A chain terminal C for external connection and a reinforcing body are assembled to the thin multipolar fuse element B shown in FIG.

This multipolar fuse element B has a fuse element 18 having a fusing part 18a and a through hole 18b like the element A described above.
are arranged in parallel in a chain on the connecting link 16 via the vertical connecting piece 17.

The external connection terminal C is integrally formed by punching and bending a metal plate material having an appropriate thickness to form a normal male tab terminal, and has a vertical connection piece 2 on one side of the connection link 19.
A plurality of output terminals 21 are arranged in parallel via 0. The output terminal 21 is spaced at the same interval as the fuse element 18, and has an external force absorbing piece 21a projecting downward from the side surface of its tip. Note that these output terminals 21 are connected to the fuse element 14
．． It may be coupled to one end of 18, especially the first
This is effective when cutting a metal plate material by milling or the like to form a fusing part as shown in the figure.

The reinforcing body is integrally molded from a thermoplastic resin having insulating properties such as polyethylene or polyamide resin, and is a partition wall inserted between adjacent fuse elements between support plates 23 and 24 for both ends of the fuse elements 14 and 18. 22, and a fuse fixing protrusion 25 protruding from the through holes 14b, 18b. One of the support plates 24 is formed to have an L-shaped cross section, and is provided with an insertion hole 24a for the external force absorbing piece 21a.

These are assembled as follows.

First, one end of the fuse element 18 is overlapped with the output terminal 21 and connected by soldering, welding, laser beam, etc. Next, the fuse fixing protrusion 25 of the reinforcing body is passed through the through hole 18b of the fuse element 18, while the external force absorbing piece 21a of the output terminal 21 is fitted into the insertion hole 24a of the support board 24. Finally, the protrusion 25 protruding from the through hole 18b is heated and melted using a jig (not shown), and the fuse element link 18 is welded and fixed to the reinforcing body. Note that the fuse fixing protrusion 25 is not only fixed by thermal melting, but also may be fixed by having its tip formed into a fiery arrow shape.

In this way, the multipolar fuse element B is reinforced by the reinforcing body, and an output terminal for external connection is assembled.

FIG. 4 shows the assembled state of the chained common terminal E, which becomes the input terminal.

Like the external connection terminal C, this chain-like common terminal E is constructed by arranging a plurality of input terminals 28 in parallel on one side of a connection link 26 via a vertical connection piece 27. At one end of each input terminal 28, as shown in FIG.
a extends in the direction of the input terminal 28. This catch 29a
is a branch connection portion for the fuse element 14, 18, and its base 29b is formed in accordance with the number of poles of the multi-pole fuse terminal to be manufactured. In the illustrated example, the input terminal 28 is connected to the three-pole fuse element 18 and is positioned approximately at the center of the seat 29a. In this way, the seat 29a of the branching part 29 is arranged so as to overlap the input terminal 28 with an appropriate interval due to its rising part 29c, so that the input terminal and the output terminal may conflict with each other, or the output terminal may It can cover a wide area without any restrictions.

There are three fuse elements 18 on this catch 29a as shown in the figure.
By overlapping the other ends and connecting by soldering or the like as described above, a plug-in type three-pole fuse terminal B' shown in FIG. 6 is obtained.

Moreover, by interposing a diode chip (not shown) between each fuse element 18 and the seat 29a, overlapping them and fixing them with high temperature solder, a multipolar fuse terminal with a diode can be obtained.

FIGS. 7 to 10 are perspective views showing other examples of how the multipolar fuse element B and the chained common terminal E are assembled.

The chain-shaped intermediate terminal F shown in FIG.
It functions as a reinforcement for the diode chip 33 and a connection plate for the diode chip 33.

That is, a diode chip 33 corresponding to the number of poles is placed on each seat 29a of the chained common terminal E, the intermediate terminal 32 is superposed on top of the diode chip 33, and the eighth diode chip is fixed with high temperature solder in the same manner as above.
), when the fuse element 18 of the multipolar fuse element B shown in FIG. 3 is connected to each intermediate terminal 32 by soldering etc.
Figure), multi-polar fuse terminal B with diode is obtained (
Figure 10).

FIGS. 11 and 12 show the state in which the multi-polar fuse terminal B'' with diode is attached to the housing and the connector with fuse is assembled.

That is, a housing cover 34 having a lock claw 35 on the side surface is attached to the head (branch portion 29) of the fuse terminal B'', resin is injected as necessary (Fig. 11), and the connecting links 19 and 26 are vertically connected. The three-pole output terminal 21 and input terminal 28 are then inserted into the housing main body 36 and fitted and locked so that they protrude from the corresponding terminal through-holes 37, thereby forming a diode. The multi-pole fuse connector G is completed.

In addition, the above-mentioned connecting links 13, 16, 19, 26 and 3
0, each fuse element assembly functions as a feeding band in the process, and after assembly, if necessary, the vertical connecting pieces 15, 17, 20, etc. can be separated in sequence,
The fuse element 14, the output terminal 21, the input terminal 28, etc. are each independent.

The production, assembly, and assembly of the multipolar fuse element and terminal according to the present invention provide the following benefits.

(1) The above connecting links 13, 16, 17...
・functions as a feeding band for continuously forming the fuse element 14, 18, output terminal 21, input terminal 28, etc. in a chain shape, and after assembly, each vertical connecting piece 15, 17, 20, etc.
It is cut and removed at...

Therefore, by selecting an input terminal 28 having a reinforcing body molded to an arbitrary number of poles and a branch part 29 with a different catch size, products with any number of poles, from single pole to multi-pole fuse terminals, can be obtained. . At that time, each fuse element 14
．． 1B, output terminal 21, etc. can be used in common for all poles, so there is no waste at all and productivity is improved.

(2) The fuse elements 14, 18, that is, the fuse blown part is a separate member, the input terminal 28, or the branch part 29 thereof.
connected to. The area of the seat 29a is hardly limited by the adjacent fuse elements, input terminals, etc., and can be made large.

Therefore, the electrical resistance value of the branch portion 29 including the input terminal can be reduced, and the resistance value up to each fusing portion is constant, eliminating variations in fusing characteristics. Further, since the area of the branch portion 29 can be made sufficiently large, the heat dissipation effect is significantly improved and the mechanical strength is also increased. Furthermore, as shown in FIG. 7, the same applies to the case where the diode 33 is connected to the branch portion 29, and there is no fear that the characteristics of the diode will be impaired.

(3) The fused portion of the fuse element link may be milled using a cutting wheel as shown in Figure 1, but this is done using Cu % T 1% A j! s M g SZ n
Because it is a non-magnetic alloy such as, it cannot be fixed to the table of a cutting machine with a magnet, making it difficult to achieve accuracy. However, as explained in FIG. 3 and subsequent figures, by using a metal plate material with the same thickness as that of the fusing part, processing accuracy is improved, and it can be easily manufactured by press molding alone. In this case, one end of the fuse element is connected to the branch of the input terminal, and the other end is connected to the output terminal, so there is no need to worry about heat radiation or mechanical strength.

(4) When soldering the diode chip at high temperature, the chip may be interposed between the branch portion 29 and the intermediate terminal 32 as shown in FIG. 7, and the fuse element 14.1, which is a separate member,
Since it can be processed separately from 8, there is no fear that the initial characteristics of the fused part will change.

(5) As shown in FIG. 3, both ends of the fuse elements 14 and 18 are supported and fixed by reinforcing bodies, and adjacent fusing parts 18a are separated from each other by partition walls 22.

Therefore, during assembly, it is difficult for external force to act on the fusing part, and variations due to residual stress and short circuits to adjacent parts at the time of fusing are also prevented.

Further, by fitting the external force absorbing piece 21a of the input terminal 21 into the insertion hole 24a of the reinforcing body, the external force acting on the terminal 21 can be absorbed by the support plate 24. Therefore, even if an external force is applied to the input terminal, the fusing portion is not affected.

(6) By having both ends of the fuse element 14, 18 serve as connection terminals, it can be inserted into a normal electric circuit or the like and used in the same way as a general fuse.

〔Effect of the invention〕

Since the present invention is as explained above, productivity is high;
It is possible to provide a stable multi-electrode terminal with a diode that has a large heat dissipation effect and has no variation in the fusing characteristics of the fuse portion. In addition, the fuse elements are supported and strengthened by the reinforcing body, and the fused parts do not need to be sealed or fixed with resin etc. when attached to the housing.Furthermore, the fuse elements are separated from each other by the partition wall of the reinforcing body, so that the action of external force does not occur. There is no risk of deformation or damage during assembly work, or short-circuiting to adjacent fuse elements.

[Brief explanation of drawings]

1 to 12 show embodiments of the present invention, in which FIG. 1 is a perspective view of a multipolar fuse element A, and FIGS. 2 (A) to (C).
3 is a perspective view of another multipolar fuse element B, FIG. 4 is a perspective view showing the assembled state of the multipolar fuse element B, and FIG. Figure 5 is an enlarged perspective view of the input terminal 28, Part 6 is a perspective view of multipolar fuse terminal B', and Figures 7 to 10 are perspective views showing other assembled states of multipolar fuse element B. , FIG. 11 and FIG. 12 are perspective views showing how the connector is assembled using the multi-polar fuse terminal B'' with diode. FIGS. 13 to 20 show the conventional example, and FIG. A perspective view of the main parts of the fuse,
Fig. 14 is a perspective view showing the entire blade-type fuse, Fig. 15 is a plan view of multipolar fuse element a, Fig. 16 is a sectional view taken along line E in Fig. 15, and Fig. 17 is an external connection terminal. 10
Fig. 18 is a plan view of the multi-polar fuse terminal, Fig. 19 is a sectional view of the multi-polar fuse terminal attached to the housing, and Fig. 20 is an enlarged view showing the function of multi-polar fuse element a. It is an explanatory diagram. A, B...Multi-pole fuse element, B'...
...Multi-pole fuse terminal, C......Chain terminal for external connection, D......Reinforcement body, E......Chain common terminal, F......Chain shaped intermediate terminal, G...
・Fuse connector terminal with diode, 13, 16, 1
9, 26, 30...Connection link, 14, 18...
...Fuse element, 14a, 18a...
Fused portion, 14b, 18b...Through hole, 21...
...Output terminal, 21a...External force absorption piece, 2
2... Bulkhead, 23, 24... Support plate,
24a...Insertion hole, 25...Fuse fixing protrusion, 28...Input terminal, 29...
...Branch, 29a...Catch, 32...
・Intermediate terminal, 33...Diode. Patent applicant Yazaki Sogyo Co., Ltd. Figure 2 (8) (B) (B) Figure 10 Figure 8 Figure 70

Claims (1)

[Claims] A plurality of fuse elements arranged in parallel at predetermined intervals and having a fusing part with a small cross-sectional area in the center and having through holes on both sides of the fusing part and partially connecting adjacent fuse elements. A multi-polar fuse element is formed by integrally punching out a connecting part for holding all the fuse elements in a planar shape from a fuse metal plate material, and a connecting part for holding all the fuse elements in a flat shape is integrally punched out from the fuse metal plate material, and a connecting part that extends in the direction of the input terminal and is mutually connected to one end of the input terminal. A branch part having a U-shaped cross section having a width corresponding to two or more of the fuse terminals adjacent to each other is provided, and a branch part having a U-shaped cross section is provided between the support plates for both ends of the two or more fuse elements, and a branch part is provided between the adjacent fuse elements. forming a synthetic resin reinforcing body having a partition wall to be inserted and a projection for fixing a fuse to the through hole on the support plate;
The fuse fixing protrusion is passed through the through hole of the above fuse element to fix the fuse element to the reinforcing body, and the above 2
Connecting and fixing one end of the above fuse element to the output terminal and the other end to the seat of the branch part through a diode, respectively,
A fuse terminal with a diode, characterized in that after the input terminal and/or output terminal are connected and fixed, the connecting portion is cut and removed to make adjacent output terminals independent.