WO2013021616A1 - Fuse - Google Patents

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Publication number
WO2013021616A1
WO2013021616A1 PCT/JP2012/004988 JP2012004988W WO2013021616A1 WO 2013021616 A1 WO2013021616 A1 WO 2013021616A1 JP 2012004988 W JP2012004988 W JP 2012004988W WO 2013021616 A1 WO2013021616 A1 WO 2013021616A1
Authority
WO
WIPO (PCT)
Prior art keywords
electric wire
heat radiation
fuse
heat
low
Prior art date
Application number
PCT/JP2012/004988
Other languages
French (fr)
Inventor
Asako Takahashi
Original Assignee
Yazaki Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yazaki Corporation filed Critical Yazaki Corporation
Priority to CN201280037267.7A priority Critical patent/CN103718266B/en
Priority to BR112014002360A priority patent/BR112014002360A2/en
Priority to KR1020147004198A priority patent/KR101539726B1/en
Publication of WO2013021616A1 publication Critical patent/WO2013021616A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/055—Fusible members
    • H01H85/08—Fusible members characterised by the shape or form of the fusible member
    • H01H85/10—Fusible members characterised by the shape or form of the fusible member with constriction for localised fusing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/47—Means for cooling

Definitions

  • the present invention relates to a fuse which, when an overcurrent (current over a rated value) is applied, shuts off the energization by fusing.
  • a conventional fuse 50 includes, as illustrated in Fig. 1, a busbar 51 made of conductive material and a low-melting-point metal 60.
  • the busbar 51 is made of copper.
  • the busbar 51 is provided with a narrow width portion 52 having a cross sectional area smaller than cross sectional areas of other portions.
  • a crimping piece portion 53 and a pair of blocking portions 54 are integrally provided with the busbar 51.
  • the low-melting-point metal (for example, tin) 60 is so disposed as to bridge over the narrow width portion 52 by the crimping piece portion 53.
  • the low-melting-point metal 60 is fixed to the busbar 51 by crimping and is welded to the busbar 51.
  • the pair of blocking portions 54 are disposed at respective outer sides of the low-melting-point metal 60 at an interval. The pair of blocking portions 54 block the melted low-melting-point metal 60 from flowing in a wide range.
  • the narrow width portion 52 when an overcurrent is applied to the busbar 51, the narrow width portion 52 will have an amount of Joule heating higher than those of other portions to thereby melt the low-melting-point metal 60, thus diffusing the thus melted low-melting-point metal 60 in the bas bar (copper) 51, to thereby lower the melting point of the copper. By this, the narrow width portion 52 is fused.
  • the low-melting-point metal 60 in addition to the busbar 51 is used in order to accomplish a desired fusing property, thereby causing the material cost, processing cost and equipment cost for the low melting point metal 60. Further, welding the low melting point metal 60 to the busbar 51 requires equipment for welding the low melting point metal 60. Thus, there was a problem that the cost is high.
  • a fuse according to a first aspect of the present invention includes: an electric wire; a heat spot portion disposed in a part of the electric wire and having a cross sectional area smaller than a cross sectional area of another portion of the electric wire; and a heat radiation member for heat radiation fixed to a portion of the electric wire different from the heat spot portion.
  • the heat spot portion is provided at a center portion of the electric wire, and that the heat radiation member is fixed to each of both sides of the heat spot portion of the electric wire.
  • the heat radiation member may be a terminal.
  • the heat radiation member may include a terminal and an electric wire for heat radiation.
  • the electric wire and the low-cost heat radiation member can accomplish the desired fusing property and therefore can dispense with the low-melting-point metal used in the conventional example.
  • the low-cost fuse can be achieved, due to no need for the material cost, processing cost and equipment cost for a low-melting-point metal.
  • Fig. 1 is a perspective view of a fuse according to a conventional example.
  • Fig. 2 is a perspective view of a fuse according to a first embodiment.
  • Fig. 3(a) is a plan view;
  • Fig. 3(b) is a front view;
  • Fig. 3(c) is a side view of the fuse according to the first embodiment.
  • Fig. 4 is a perspective view of a heat spot portion formed by rolling a center part of an electric wire in the fuse according to the first embodiment.
  • Fig. 5 illustrates a line map of fusing properties of various electric wires.
  • Fig. 6 is a perspective view of a fuse according to a second embodiment.
  • Figs. 2 to 5 illustrate a first embodiment.
  • a fuse 1A according to the first embodiment includes an electric wire 2 and two ring tongue terminals 11 each fixed to either end of the electric wire 2 by crimping.
  • the electric wire 2 is, for example, a soft copper wire prepared by twisting and bundling a plurality of wires made of conductive material.
  • the electric wire 2 is so set to have a predetermined length.
  • a heat spot portion 3 having a cross sectional area smaller than cross sectional areas of other portions.
  • the heat spot portion 3 is prepared by rolling the center portion of the electric wire 2.
  • Heat radiation members 4 are fixed to portions at both sides of the heat spot portion 3 of the electric wire 2.
  • a splice terminal is used as each of the heat radiation members 4, a splice terminal is used.
  • the splice terminal is made of materials of high thermal conductivity. The portion to which the splice terminal is fixed is caused to have a large heat capacity and a large surface area.
  • the electric wire 2 prepared by twisting a plurality of wires made of conductive material is used.
  • the center portion of the electric wire 2 is rolled to thereby form the heat spot portion 3 having the cross sectional area smaller than cross sectional areas of other portions (heat spot forming step).
  • the ring tongue terminals 11 are each fixed to either end portion of the electric wire 2 by crimping.
  • the splice terminals of the heat radiation members 4 are fixed to portions at both sides of the heat spot portion 3 of the electric wire 2 by crimping. This completes the production of the fuse 1A.
  • the entire outer periphery of the electric wire 2 other than both ends may be covered with an insulating protective layer (not illustrated).
  • the fuse 1A thus produced has the following fusing property.
  • the electric wire 2 one that has such a fusing property that it is fused within the standard of ISO 8820 at a local short circuit region (200 % energization) in an unprocessed state is used.
  • the fusing property curve of the unprocessed electric wire W1 is depicted by W1 in Fig. 5.
  • the electric wire W2 which has only the heat radiation members 4 but does not have the heat spot portion 3 has a large heat radiation when the temperature of the electric wire 2 rises because of the large surface area for the air and the electric wire 2 to contact with each other at the portion where each of the heat radiation members 4 is fixed. Therefore, compared with the unprocessed electric wire W1, the electric wire W2 has a delayed fusing time in the entire energization region of the overcurrent.
  • the fusing property curve of the electric wire W2 which has only the heat radiation members 4 is depicted by W2 in Fig. 5.
  • the fusing time of the electric wire W2 falls within the standard range, in the dead short circuit region (600 % energization), the fusing time of the electric wire W2 takes longer than the standard.
  • the fuse 1A Compared with the electric wire W2 which has only the heat radiation members 4, the fuse 1A according to the first embodiment causes a larger calorific value at the heat spot portion 3, thus making the fusing time shorter especially at the dead short circuit region (600 % energization).
  • the fusing property curve of the fuse 1A is depicted by 1A in Fig. 5. Therefore, the fusing time of the fuse 1A at the dead short circuit region (600% energization) falls within the standard range.
  • the fuse 1A can accomplish a protection at the fusing property 5 level pursuant to ISO 8820 without utilizing a low-melting-point metal.
  • the fuse 1A according to the first embodiment can accomplish the desired fusing property by using the electric wire 2 and the heat radiation members 4 that is lower in cost than the low-melting-point metal and therefore can dispense with the low-melting-point metal used in the conventional example.
  • the fuse 1A according to the first embodiment is low in cost, due to no need for the material cost, processing cost and equipment cost for the low-melting-point metal.
  • the heat spot portion 3 is provided at the center of the electric wire 2 and the heat radiation members 4 are provided at both ends of the heat spot portion 3 of the electric wire 2 respectively. Since the increase in temperature at both outer side portions of the heat spot portion 3 is suppressed by the heat radiation, fusing at the heat spot portion 3 can be assured.
  • Each of the heat radiation members 4 uses the splice terminal.
  • the splice terminal is low in cost and easily available, and it can be fixed to the electric wire 2 with ease. (Second embodiment)
  • Fig. 6 illustrates a second embodiment of the present invention.
  • a fuse 1B according to the second embodiment is different in a structure of heat radiation members 4A. That is, as each heat radiation member 4A, splice terminal 4a and heat radiation electric wire 4b are used. One end of the heat radiation electric wire 4b is crimped by the splice terminal 4a together with the electric wire 2.
  • fuse 1B according to the second embodiment are substantially the same as those of the fuse 1A according to the first embodiment, and therefore same reference numerals or signs are to be used for the same structural portions in the drawings, and explanations thereof will be omitted.
  • the fuse 1B according to the second embodiment can accomplish the desired fusing property by using the electric wire 2 and the heat radiation members 4A and therefore can dispense with the low-melting-point metal used in the conventional example.
  • the fuse 1B according to the second embodiment is low in cost, due to no need for the material cost, processing cost and equipment cost for the low-melting-point metal.
  • the fuse 1B according to the second embodiment since each of the heat radiation members 4A uses the splice terminal 4a and the heat radiation electric wire 4b, the heat radiation can be implemented not only from the splice terminal 4a but also from the surface of the heat radiation electric wire 4b.
  • the fuse 1B according to the second embodiment has a heat radiation property that is better than the fuse 1A according to the first embodiment.
  • the splice terminal 4a and the heat radiation electric wire 4b are each low in cost and easily available. Further, the splice terminal 4a and the heat radiation electric wire 4b are a combination of component parts that can be fixed to the electric wire 2 with ease.

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  • Fuses (AREA)
  • Insulating Bodies (AREA)
  • Details Of Indoor Wiring (AREA)

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
The present invention relates to a fuse which, when an overcurrent (current over a rated value) is applied, shuts off the energization by fusing.
As a fuse of this type according to a conventional example, one disclosed in PTL 1 is given. A conventional fuse 50 includes, as illustrated in Fig. 1, a busbar 51 made of conductive material and a low-melting-point metal 60. The busbar 51 is made of copper. The busbar 51 is provided with a narrow width portion 52 having a cross sectional area smaller than cross sectional areas of other portions. A crimping piece portion 53 and a pair of blocking portions 54 are integrally provided with the busbar 51. The low-melting-point metal (for example, tin) 60 is so disposed as to bridge over the narrow width portion 52 by the crimping piece portion 53. The low-melting-point metal 60 is fixed to the busbar 51 by crimping and is welded to the busbar 51. The pair of blocking portions 54 are disposed at respective outer sides of the low-melting-point metal 60 at an interval. The pair of blocking portions 54 block the melted low-melting-point metal 60 from flowing in a wide range.
In the above structure, when an overcurrent is applied to the busbar 51, the narrow width portion 52 will have an amount of Joule heating higher than those of other portions to thereby melt the low-melting-point metal 60, thus diffusing the thus melted low-melting-point metal 60 in the bas bar (copper) 51, to thereby lower the melting point of the copper. By this, the narrow width portion 52 is fused.
US 5,528,213 A
However, with the conventional fuse 50 described above, the low-melting-point metal 60 in addition to the busbar 51 is used in order to accomplish a desired fusing property, thereby causing the material cost, processing cost and equipment cost for the low melting point metal 60. Further, welding the low melting point metal 60 to the busbar 51 requires equipment for welding the low melting point metal 60. Thus, there was a problem that the cost is high.
For solving the above problem the present invention has been made. It is an object of the present invention to provide a low cost fuse.
A fuse according to a first aspect of the present invention includes: an electric wire; a heat spot portion disposed in a part of the electric wire and having a cross sectional area smaller than a cross sectional area of another portion of the electric wire; and a heat radiation member for heat radiation fixed to a portion of the electric wire different from the heat spot portion.
It is preferable that the heat spot portion is provided at a center portion of the electric wire, and that the heat radiation member is fixed to each of both sides of the heat spot portion of the electric wire.
The heat radiation member may be a terminal. The heat radiation member may include a terminal and an electric wire for heat radiation.
With the fuse according to the first aspect of the present invention, the electric wire and the low-cost heat radiation member can accomplish the desired fusing property and therefore can dispense with the low-melting-point metal used in the conventional example. Thus, the low-cost fuse can be achieved, due to no need for the material cost, processing cost and equipment cost for a low-melting-point metal.
Fig. 1 is a perspective view of a fuse according to a conventional example. Fig. 2 is a perspective view of a fuse according to a first embodiment. Fig. 3(a) is a plan view; Fig. 3(b) is a front view; and Fig. 3(c) is a side view of the fuse according to the first embodiment. Fig. 4 is a perspective view of a heat spot portion formed by rolling a center part of an electric wire in the fuse according to the first embodiment. Fig. 5 illustrates a line map of fusing properties of various electric wires. Fig. 6 is a perspective view of a fuse according to a second embodiment.
Hereinafter, embodiments of the present invention will be explained based on the drawings.
(First embodiment)
Figs. 2 to 5 illustrate a first embodiment. As illustrated in Figs. 2 and 3, a fuse 1A according to the first embodiment includes an electric wire 2 and two ring tongue terminals 11 each fixed to either end of the electric wire 2 by crimping.
The electric wire 2 is, for example, a soft copper wire prepared by twisting and bundling a plurality of wires made of conductive material. The electric wire 2 is so set to have a predetermined length. At the center portion of the electric wire 2, there is provided a heat spot portion 3 having a cross sectional area smaller than cross sectional areas of other portions. The heat spot portion 3 is prepared by rolling the center portion of the electric wire 2. Heat radiation members 4 are fixed to portions at both sides of the heat spot portion 3 of the electric wire 2. As each of the heat radiation members 4, a splice terminal is used. The splice terminal is made of materials of high thermal conductivity. The portion to which the splice terminal is fixed is caused to have a large heat capacity and a large surface area.
Next, a production method of the fuse 1A according to the first embodiment will be explained. The electric wire 2 prepared by twisting a plurality of wires made of conductive material is used. First, by using a rolling mill, the center portion of the electric wire 2 is rolled to thereby form the heat spot portion 3 having the cross sectional area smaller than cross sectional areas of other portions (heat spot forming step).
Next, as illustrated in Fig. 4, the ring tongue terminals 11 are each fixed to either end portion of the electric wire 2 by crimping.
Next, as illustrated in Fig. 2, the splice terminals of the heat radiation members 4 are fixed to portions at both sides of the heat spot portion 3 of the electric wire 2 by crimping. This completes the production of the fuse 1A. In addition, the entire outer periphery of the electric wire 2 other than both ends may be covered with an insulating protective layer (not illustrated).
Compared with an unprocessed electric wire W1 or an electric wire W2 which has the heat radiation members 4 and does not have the heat spot portion 3, the fuse 1A thus produced has the following fusing property. As the electric wire 2, one that has such a fusing property that it is fused within the standard of ISO 8820 at a local short circuit region (200 % energization) in an unprocessed state is used. The fusing property curve of the unprocessed electric wire W1 is depicted by W1 in Fig. 5. The electric wire W2 which has only the heat radiation members 4 but does not have the heat spot portion 3 has a large heat radiation when the temperature of the electric wire 2 rises because of the large surface area for the air and the electric wire 2 to contact with each other at the portion where each of the heat radiation members 4 is fixed. Therefore, compared with the unprocessed electric wire W1, the electric wire W2 has a delayed fusing time in the entire energization region of the overcurrent. The fusing property curve of the electric wire W2 which has only the heat radiation members 4 is depicted by W2 in Fig. 5. Thus, while in the region other than a dead short circuit region (600% energization), the fusing time of the electric wire W2 falls within the standard range, in the dead short circuit region (600 % energization), the fusing time of the electric wire W2 takes longer than the standard.
Compared with the electric wire W2 which has only the heat radiation members 4, the fuse 1A according to the first embodiment causes a larger calorific value at the heat spot portion 3, thus making the fusing time shorter especially at the dead short circuit region (600 % energization). The fusing property curve of the fuse 1A is depicted by 1A in Fig. 5. Therefore, the fusing time of the fuse 1A at the dead short circuit region (600% energization) falls within the standard range. The fuse 1A can accomplish a protection at the fusing property 5 level pursuant to ISO 8820 without utilizing a low-melting-point metal.
As explained above, the fuse 1A according to the first embodiment can accomplish the desired fusing property by using the electric wire 2 and the heat radiation members 4 that is lower in cost than the low-melting-point metal and therefore can dispense with the low-melting-point metal used in the conventional example. Thus, the fuse 1A according to the first embodiment is low in cost, due to no need for the material cost, processing cost and equipment cost for the low-melting-point metal.
The heat spot portion 3 is provided at the center of the electric wire 2 and the heat radiation members 4 are provided at both ends of the heat spot portion 3 of the electric wire 2 respectively. Since the increase in temperature at both outer side portions of the heat spot portion 3 is suppressed by the heat radiation, fusing at the heat spot portion 3 can be assured.
Each of the heat radiation members 4 uses the splice terminal. The splice terminal is low in cost and easily available, and it can be fixed to the electric wire 2 with ease.
(Second embodiment)
Fig. 6 illustrates a second embodiment of the present invention. As illustrated in Fig. 6, compared with the fuse 1A according to the first embodiment, a fuse 1B according to the second embodiment is different in a structure of heat radiation members 4A. That is, as each heat radiation member 4A, splice terminal 4a and heat radiation electric wire 4b are used. One end of the heat radiation electric wire 4b is crimped by the splice terminal 4a together with the electric wire 2.
Other structures of the fuse 1B according to the second embodiment are substantially the same as those of the fuse 1A according to the first embodiment, and therefore same reference numerals or signs are to be used for the same structural portions in the drawings, and explanations thereof will be omitted.
The fuse 1B according to the second embodiment, like the fuse 1A according to the first embodiment, can accomplish the desired fusing property by using the electric wire 2 and the heat radiation members 4A and therefore can dispense with the low-melting-point metal used in the conventional example. Thus, the fuse 1B according to the second embodiment is low in cost, due to no need for the material cost, processing cost and equipment cost for the low-melting-point metal.
With the fuse 1B according to the second embodiment, since each of the heat radiation members 4A uses the splice terminal 4a and the heat radiation electric wire 4b, the heat radiation can be implemented not only from the splice terminal 4a but also from the surface of the heat radiation electric wire 4b. Thus, the fuse 1B according to the second embodiment has a heat radiation property that is better than the fuse 1A according to the first embodiment. The splice terminal 4a and the heat radiation electric wire 4b are each low in cost and easily available. Further, the splice terminal 4a and the heat radiation electric wire 4b are a combination of component parts that can be fixed to the electric wire 2 with ease.

Claims (4)

  1. A fuse, comprising:
    an electric wire;
    a heat spot portion disposed in a part of the electric wire and having a cross sectional area smaller than a cross sectional area of another portion of the electric wire; and
    a heat radiation member for heat radiation fixed to a portion of the electric wire different from the heat spot portion.
  2. The fuse according to claim 1, wherein
    the heat spot portion is provided at a center portion of the electric wire, and
    the heat radiation member is fixed to each of both sides of the heat spot portion of the electric wire.
  3. The fuse according to claim 1, wherein the heat radiation member is a terminal.
  4. The fuse according to claim 1, wherein the heat radiation member includes a terminal and an electric wire for heat radiation.
PCT/JP2012/004988 2011-08-08 2012-08-06 Fuse WO2013021616A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201280037267.7A CN103718266B (en) 2011-08-08 2012-08-06 Fuse
BR112014002360A BR112014002360A2 (en) 2011-08-08 2012-08-06 fuse
KR1020147004198A KR101539726B1 (en) 2011-08-08 2012-08-06 Fuse

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011-173019 2011-08-08
JP2011173019A JP5764006B2 (en) 2011-08-08 2011-08-08 fuse

Publications (1)

Publication Number Publication Date
WO2013021616A1 true WO2013021616A1 (en) 2013-02-14

Family

ID=47668153

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2012/004988 WO2013021616A1 (en) 2011-08-08 2012-08-06 Fuse

Country Status (5)

Country Link
JP (1) JP5764006B2 (en)
KR (1) KR101539726B1 (en)
CN (1) CN103718266B (en)
BR (1) BR112014002360A2 (en)
WO (1) WO2013021616A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11127553B1 (en) 2018-08-29 2021-09-21 Autonetworks Technologies, Ltd. Overcurrent cutoff unit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102469281B1 (en) 2016-05-13 2022-11-22 삼성전자주식회사 Electronic device including antenna

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6111259U (en) * 1984-06-26 1986-01-23 住友電装株式会社 slow acting fuse
JPH08190809A (en) * 1995-01-11 1996-07-23 Sumitomo Electric Ind Ltd Wire with fuse

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS608573B2 (en) * 1983-04-19 1985-03-04 金邦電気株式会社 Fuse for electric wire
CA1264791A (en) * 1987-03-20 1990-01-23 Vojislav Narancic Fuse having a non-porous rigid ceramic arc extinguishing body and method for fabricating such a fuse
US6046665A (en) * 1996-08-22 2000-04-04 Littelfuse, Inc. Fusible link, and link and cable assembly
JP2001052591A (en) * 1999-08-04 2001-02-23 Auto Network Gijutsu Kenkyusho:Kk Wire-equipped fuse
JP2004319395A (en) * 2003-04-18 2004-11-11 Sumitomo Wiring Syst Ltd Wire with fuse

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6111259U (en) * 1984-06-26 1986-01-23 住友電装株式会社 slow acting fuse
JPH08190809A (en) * 1995-01-11 1996-07-23 Sumitomo Electric Ind Ltd Wire with fuse

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11127553B1 (en) 2018-08-29 2021-09-21 Autonetworks Technologies, Ltd. Overcurrent cutoff unit

Also Published As

Publication number Publication date
CN103718266B (en) 2016-05-11
JP5764006B2 (en) 2015-08-12
KR20140043815A (en) 2014-04-10
BR112014002360A2 (en) 2017-03-01
JP2013037889A (en) 2013-02-21
KR101539726B1 (en) 2015-07-27
CN103718266A (en) 2014-04-09

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