CN103718266A

CN103718266A - Fuse

Info

Publication number: CN103718266A
Application number: CN201280037267.7A
Authority: CN
Inventors: 高桥朝子
Original assignee: Yazaki Corp
Current assignee: Yazaki Corp
Priority date: 2011-08-08
Filing date: 2012-08-06
Publication date: 2014-04-09
Anticipated expiration: 2032-08-06
Also published as: KR20140043815A; JP2013037889A; WO2013021616A1; JP5764006B2; KR101539726B1; BR112014002360A2; CN103718266B

Abstract

A fuse (1A) includes: an electric wire (2); a heat spot portion (3) disposed in a part of the electric wire (2) and having a cross sectional area smaller than a cross sectional area of another portion of the electric wire (2); and a heat radiation member (4) for heat radiation fixed to a portion of the electric wire (2) different from the heat spot portion (3).

Description

Fuse

Technical field

The present invention relates to a kind of fuse, when applying overcurrent (higher than the electric current of rated value), this fuse cuts off energising by fusing.

Background technology

As according to such fuse of conventional example, provided disclosed a kind of fuse in patent documentation 1.As shown in fig. 1, traditional fuse 50 comprises: the busbar 51 of being made by electric conducting material; With low-melting-point metal 60.Busbar 51 is made of copper.Busbar 51 is provided with the narrow width segments 52 with the area of section less than the area of section of other parts.Compressing piece part 53 and a pair of stop portions 54 arrange integratedly with busbar 51.Low-melting-point metal (for example, tin) 60 is placed into by compressing piece part 53 spannings on narrow width segments 52.Low-melting-point metal 60 is fixed to busbar 51 and is welded to busbar 51 by crimping.Described a pair of stop portions 54 is seated in the respective outer place of low-melting-point metal 60 at certain intervals.Described a pair of stop portions 54 stops that the low-melting-point metal 60 of fusing flows in large scope.

In above structure, when overcurrent is applied to busbar 51, narrow width segments 52, by having the Joule heating amount higher than other parts, melts this low-melting-point metal 60 thus, therefore make the low-melting-point metal 60 of so fusing spread in busbar (copper) 51, thereby this reduce the fusing point of copper.Thus, make narrow width segments 52 fusing.

Reference listing

Patent documentation

Patent documentation 1:US5,528,213A

Summary of the invention

Yet, utilize above-mentioned traditional fuse 50, except busbar 51, used low-melting-point metal 60 to realize desired operating chacteristics, produced thus material cost, processing cost and equipment cost for low-melting-point metal 60.In addition, low-melting-point metal 60 being welded to busbar 51 need to be for welding the equipment of low-melting-point metal 60.Therefore, there is the problem that cost is high.

In order to overcome the above problems, realized the present invention.One object of the present invention is to provide a kind of low-cost fuse.

Fuse according to a first aspect of the invention comprises: electric wire; Focus part, this focus is partly arranged in a part for described electric wire, and this focus partly has the area of section less than the area of section of other parts of described electric wire; And for thermal-radiating heat radiation part, this heat radiation part is fixed to the part different from described focus part of described electric wire.

Preferably focus is partly arranged on the central portion office of electric wire, and heat radiation part is fixed to each side in the both sides of focus part of electric wire.

Heat radiation part can be terminal.Heat radiation part can comprise terminal and for thermal-radiating electric wire.

Utilize fuse according to a first aspect of the invention, electric wire and low-cost heat radiation part can be realized desired operating chacteristics, and therefore can exempt the low-melting-point metal using in conventional example.Therefore,, due to the material cost without for low-melting-point metal, processing cost and equipment cost, low-cost fuse can be achieved.

Accompanying drawing explanation

Fig. 1 is according to the perspective view of the fuse of conventional example.

Fig. 2 is according to the perspective view of the fuse of the first embodiment.

Fig. 3 (a) is according to the plan view of the fuse of the first embodiment; Fig. 3 (b) is its front view; And Fig. 3 (c) is its end view.

Fig. 4 is according to the perspective view of the focus part that in the fuse of the first embodiment, the middle body by rolling electric wire forms.

Fig. 5 illustrates the line layout figure of the operating chacteristics of various electric wires.

Fig. 6 is according to the perspective view of the fuse of the second embodiment.

Embodiment

Hereinafter, will explain embodiments of the invention based on accompanying drawing.

(the first embodiment)

Fig. 2 to 5 illustrates the first embodiment.As be shown in figures 2 and 3, according to the fuse 1A of the first embodiment, comprise: electric wire 2 and two ring tongue terminals 11, each ring tongue terminal 11 is fixed to arbitrary end of electric wire 2 by crimping.

Electric wire 2 is for example the annealed copper wire of preparing by the stranded many lines of being made by electric conducting material with harness.Electric wire 2 is configured to have predetermined length.In the central portion office of electric wire 2, the focus part 3 with the area of section less than the area of section of other parts is set.By the central portion of rolling electric wire 2, assign to prepare this focus part 3.Heat radiation part 4 is fixed to the part at the place, both sides of the focus part 3 of electric wire 2.As each heat radiation part 4, used envelope curve terminal (splice terminal).Envelope curve terminal is made by the material of high thermal conductivity.The part that envelope curve terminal is fixed to has large thermal capacity and large surface area.

Then, will explain according to the manufacture method of the fuse 1A of the first embodiment.The electric wire 2 that use is prepared by the stranded many lines of being made by electric conducting material.First, by using milling train, the middle body of electric wire 2 is rolled into and forms the focus part 3(focus with the area of section less than the area of section of other parts and emerge step).

Then, as shown in FIG. 4, by crimping, by ring tongue terminal 11, each is fixed to arbitrary end of electric wire 2.

Then, as shown in FIG. 2, by crimping, the envelope curve terminal of heat radiation part 4 is fixed to the part at the place, both sides of the focus part 3 of electric wire 2.This has completed the manufacture of fuse 1A.In addition, the whole peripheries except two ends of electric wire 2 can be covered by insulating protective layer (not shown).

With crude electric wire W1 or have heat radiation part 4 and the electric wire W2 without focus part 3 compares, the fuse 1A so manufacturing has following operating chacteristics.As electric wire 2, used the electric wire with this operating chacteristics, that is, under crude state, in partial short-circuit region, (200% energising) is in fusing in ISO8820 standard to this electric wire.Utilize W1 in Fig. 5 to draw the operating chacteristics curve of crude electric wire W1.Because the surface area being in contact with one another at the fixing part place air of each heat radiation part 4 and electric wire 2 is large, so when the temperature of electric wire 2 raises, only there is heat radiation part 4 and the electric wire W2 without focus part 3 has large thermal radiation.Therefore, compare with crude electric wire W1, electric wire W2 has the fusing time of delay in whole energization areas of overcurrent.Utilize W2 in Fig. 5 to draw the operating chacteristics curve of the electric wire W2 only with heat radiation part 4.Therefore, although in the region except dead short circuit region (600% energising), the fusing time of electric wire W2 falls in critical field, and in dead short circuit region (600% energising), the fusing time of electric wire W2 takies the time longer than standard.

Compare with the electric wire W2 only with heat radiation part 4, according to the fuse 1A of the first embodiment, at focus part 3 places, produce larger calorific capacity, make especially in dead short circuit region (600% energising) to locate fusing time shorter.Utilize 1A in Fig. 5 to draw the operating chacteristics curve of fuse 1A.Therefore the fusing time that, (600% energising) locates fuse 1A in dead short circuit region falls in critical field.Fuse 1A can realize the protection under operating chacteristics 5 levels in accordance with ISO8820, and does not need to utilize low-melting-point metal.

As previously discussed, can be by realizing desired operating chacteristics with electric wire 2 and the cost heat radiation part 4 lower than the cost of low-melting-point metal according to the fuse 1A of the first embodiment, and therefore can exempt the low-melting-point metal using in conventional example.Therefore, due to the material cost without for low-melting-point metal, processing cost and equipment cost, according to the fuse 1A of the first embodiment, be, cheaply.

Focus part 3 is arranged on the centre of electric wire 2 and place, the two ends of the focus part 3 that heat radiation part 4 is separately positioned on electric wire 2.Because suppressed the increase in the temperature of the office, two outside portions of focus part 3 by thermal radiation, so can guarantee the fusing at focus part 3 places.

Each heat radiation part 4 is used envelope curve terminal.Envelope curve terminal is cheaply and is easy to obtain, and it can be easily fixed to electric wire 2.

(the second embodiment)

Fig. 6 illustrates the second embodiment of the present invention.As shown in FIG. 6, compare with the fuse 1A according to the first embodiment, according to the difference of the fuse 1B of the second embodiment, be the structure of heat radiation part 4A.That is,, as each heat radiation part 4A, envelope curve terminal 4a and thermal radiation electric wire 4b have been used.One end of thermal radiation electric wire 4b together with electric wire 2 by envelope curve terminal 4a crimping.

Therefore according to other structure of the fuse 1B of the second embodiment, with basic identical according to those structures of the fuse 1A of the first embodiment, and identical Reference numeral or symbol, for identical in the drawings structure division, and will omit its explanation.

With according to the fuse 1A of the first embodiment similarly, can be by using electric wire 2 and heat radiation part 4A realize desired operating chacteristics according to the fuse 1B of the second embodiment, and therefore can exempt the low-melting-point metal using in conventional example.Therefore, due to the material cost without for low-melting-point metal, processing cost and equipment cost, according to the fuse 1B of the second embodiment, be, cheaply.

Utilization is according to the fuse 1B of the second embodiment because each heat radiation part 4A is used envelope curve terminal 4a and thermal radiation electric wire 4b, so can be not only from envelope curve terminal 4a but also carry out thermal radiation from the surface of thermal radiation electric wire 4b.Therefore, according to the fuse 1B of the second embodiment, there is beguine according to the better thermal radiation property of fuse 1A of the first embodiment.Envelope curve terminal 4a and thermal radiation electric wire 4b each be cheaply and be easy to obtain.In addition, envelope curve terminal 4a and thermal radiation electric wire 4b are the combinations that can be easily fixed to the parts of electric wire 2.

Claims

1. a fuse, comprising:

Electric wire;

Focus part, this focus is partly arranged in a part for described electric wire, and this focus partly has the area of section less than the area of section of other parts of described electric wire; And

For thermal-radiating heat radiation part, this heat radiation part is fixed to the part different from described focus part of described electric wire.

2. fuse according to claim 1, wherein,

Described focus is partly arranged on the central portion office of described electric wire, and

Described heat radiation part is fixed to each side in the both sides of described focus part of described electric wire.

3. fuse according to claim 1, wherein, described heat radiation part is terminal.

4. fuse according to claim 1, wherein, described heat radiation part comprises terminal and for thermal-radiating electric wire.