JP2013041738A - Fuse unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable standardization of a fuse holder, and to prevent wrong wire connection at the time when connecting an electric wire of a load to a load terminal of a fusible element with certainty.SOLUTION: A plurality of fusible elements 4 formed to be branched from a power supply terminal to which a battery power supply is connected, and melted by an overcurrent, and a plurality of load terminals 5 coupled to the respective fusible elements are formed in a unified manner. The fusible elements and the load terminals are housed in a resin fuse holder 3. In the fuse holder, a plurality of groove parts 6 in which the load terminals 5 and connectors 10 of electric wires 9 connected to the load terminals are housed respectively are arranged via partition walls 7. The respective groove parts 6 are formed so that compatible electric wire designation members 13 each having an opening with a width D corresponding to the thickness of the electric wire 9 to be connected to the load terminal 5 can be attached to at least a part on a front surface side of the partition walls 7.

Description

  The present invention relates to a fuse unit, and more particularly to a technique suitable for standardizing a resin fuse holder in which a plurality of fuses and load terminals for protecting a load are accommodated.

  For example, various types of fuse units have been proposed as fuse units used for overcurrent protection of electrical circuits of vehicles such as automobiles. For example, the fuse unit described in Patent Document 1 includes a power supply terminal to which a battery power supply is connected, a plurality of fusible bodies integrally formed by branching from the power supply terminal, and each fusible body formed continuously. The plurality of load terminals thus formed are formed as bus bars that are integrally processed by punching a conductor plate. The fuse unit includes a resin-made fuse holder in which a plurality of groove portions arranged via a partition wall are formed, and each of the fuse members and the load terminal is accommodated in the groove portion. In addition, the fuse unit described in this document simplifies the electrical circuit by fastening the power supply terminal to the battery terminal detachably connected to the battery electrode with bolts and nuts, and holding the fuse unit itself in the battery. Yes.

JP 2000-182506 A

  By the way, the fusible body melts and protects the load circuit when an overcurrent flows through the load circuit connected to the corresponding load terminal, and is referred to as the nominal rated current of the fusible body (hereinafter simply referred to as the rated current). ) Is determined according to the load circuit current to be protected. Therefore, when a plurality of load circuits to be protected are provided, a multiple fuse unit including a plurality of fusible bodies having different rated currents according to each load circuit is used. Further, when the load currents of the plurality of load circuits are different, the fuse unit is manufactured using a plurality of fusible bodies having different rated currents. In that case, if combinations of rated currents of a plurality of fusible bodies are different, a fuse unit must be manufactured for each combination.

  Here, it is inevitable to manufacture multiple types of bus bar parts consisting of power terminals, fusible bodies, and load terminals according to the combination of rated currents of plural fusible bodies, but a resin fuse box that accommodates them If the specifications can be standardized, the production efficiency can be improved and the efficiency of inventory management can be improved. In other words, regardless of the combination of the rated currents of a plurality of fusible bodies, if the external dimensions of the power supply terminal, fusible body, and load terminal are made common, the specifications of the resin fuse box that accommodates them can be standardized. According to this, the types of molds for the fuse box can be reduced, and the efficiency of manufacturing and inventory management of the fuse box can be improved.

  However, if the fuse box is standardized, the load terminals have the same shape even if there is a difference in the rated current of the fusible element.Therefore, when connecting multiple wires connected to each load to the load terminals, the rated current is There is a risk of accidental connection to load terminals of different fusible bodies. Thereby, a load circuit with a small load current cannot be protected, or a fusible body to which a load circuit with a large load current is connected may be blown carelessly. In order to prevent such erroneous connection, the identification code indicating the size of the wire that can be connected to each load terminal is displayed, or the size of the wire to be connected is described in the assembly manual in accordance with the order of arrangement of the load terminals. It is possible. However, with these misconnection prevention measures, it is difficult to eliminate all confirmation errors of assembly workers.

  The problem to be solved by the present invention is to provide a fuse unit that can standardize a fuse holder and reliably prevent erroneous connection when a load electric wire is connected to a load terminal of a fusible body.

  In order to solve the above problems, a first aspect of the present invention includes a power supply terminal to which a battery power supply is connected, a plurality of fusible bodies that are branched from the power supply terminal and melted by overcurrent, and A plurality of load terminals respectively coupled to the melt are integrally formed, and the fusible body and the load terminal are accommodated in a resin fuse holder, and the fuse holder is connected to the load terminal and the load terminal. In the fuse unit in which a plurality of groove portions each accommodating a connection portion of an electric wire are arranged via a partition wall, each groove portion is connected to the load terminal at least at a part on the front side of the partition wall. The suitable electric wire designation | designated member which has the opening of the width | variety corresponding to the thickness of the electric wire to be attached is formed so that attachment is possible.

  When connecting a load electric wire to the fuse unit, a wire with a round terminal crimped to the load terminal is fastened with a bolt or nut. When fastening with the bolt or nut or after fastening, the electric wire is accommodated in the groove of the fuse holder. Therefore, when an operator stores an electric wire in the groove, it is possible to prevent erroneous connection by checking whether the thickness of the electric wire connected to the load terminal of the groove is the same as the opening width of the compatible electric wire designating member. it can. That is, since a load wire must be connected to a load terminal connected to a fusible body with a rated current corresponding to the current capacity of the load, the wire having a cross-sectional area determined based on the current capacity of the load Connecting to the specified load terminal can prevent incorrect connection. In particular, electric wires for electrical circuits of vehicles such as automobiles are formed by bundling wires that are connected to the fuse unit as wire harnesses, so workers can attach appropriate wire designation members with opening widths that match the thickness of the wires. It is possible to connect without error to the load terminal of the groove portion formed.

  According to a second aspect of the present invention, in the first aspect, a slit is formed in each of the partition walls on both sides of each groove from the front surface of the groove toward the bottom of the groove. A side edge of one plate member is formed to be press-fitted into a slit of the one partition wall, and a side edge of the other plate member is formed to be press-fitted into a slit of the other partition wall. The width of the opening may be set by the interval between the other side edges of the plate member.

  As a modification of the second aspect, the slit is formed partway from the groove front surface of the partition wall to the groove bottom, and the side edge of the plate member has a tip that contacts the groove inner surface of the partition wall. The side surface from the front end portion to the rear end portion can be press-fitted into the slit. According to this, since the positioning accuracy of the compatible wire designating member is stable, the accuracy of the opening width of the pair of plate members is stabilized, and the thickness of the compatible wire can be confirmed without error. Furthermore, the strength of the partition wall can be improved.

  Further, according to a third aspect of the present invention, in the first aspect, a slit is formed in each of the partition walls on both sides of each groove from the front surface of the groove toward the bottom of the groove. A bottom plate corresponding to the bottom portion of the groove portion, a pair of wall plates erected from side edges corresponding to the partition walls on both sides of each groove portion of the bottom plate, and a lower end of the pair of wall plates and the bottom plate. The plate member is formed with projecting portions in which both ends corresponding to the groove width direction of the groove portions protrude from the outer surfaces of the pair of walls by the depth of the slit, The plate thickness is formed to be the width of the slit, and an opening having a width corresponding to the thickness of the electric wire can be formed at the front edge of the plate member. According to this, since the opening width that specifies the thickness of the electric wire can be defined by the opening of one plate member, the accuracy of the opening width can be stabilized, and the thickness of the matching electric wire can be confirmed without further error. Furthermore, when the compatible wire designating member is automatically assembled to the fuse unit, the configuration of the assembling apparatus can be simplified.

  Furthermore, in any one of the above aspects of the present invention, a plate-like base extending from the bottom of the groove is provided at an end of the groove on the side of the electric wire lead-in part of the partition wall, and the slit is the base It can be formed in contact with. According to this, since the lower end of a partition wall can be reinforced with a base, the intensity | strength of a partition wall can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, the fuse holder which can standardize a fuse holder and can prevent reliably the misconnection at the time of connecting the electric wire of a load to the load terminal of a soluble body can be provided.

It is a figure which shows the structure of embodiment of the fuse unit of this invention. It is a figure which shows the detail of the compatible electric wire designation | designated member of embodiment of FIG. It is an assembly external view of the fuse unit of the embodiment of FIG. It is a figure which shows the structure of other embodiment of the fuse unit of this invention. It is a principal part detail drawing of embodiment of FIG. It is an external view of the principal part of further another embodiment of the fuse unit of this invention.

Hereinafter, a fuse unit of the present invention will be described based on embodiments.
(First embodiment)
As shown in FIGS. 1A and 1B, the fuse unit 1 of the present embodiment includes a resin body housing 2 that accommodates power terminals, and a resin fuse holder 3 that is suspended from the body housing 2. It is formed with. The body housing 2 accommodates a plate-like power terminal (not shown in the figure) composed of a bus bar to which a battery power source (not shown) is connected. The fuse holder 3 includes a fuse housing portion 3a that houses a plurality of fusible bodies 4 that melt when an overcurrent flows, a load terminal 5 connected to each fusible body 4, and an electric wire connection of a load connected to the load terminal 5. A load terminal accommodating portion 3b that accommodates a plurality of portions is integrally formed. In the illustrated example, five sets of the fusible body 4 and the load terminal 5 are provided. However, the present invention is not limited to this, and a plurality of sets of the fusible body 4 and the load terminal 5 can be provided based on the required specifications. Further, the plurality of fusible bodies 4 are respectively formed by branching from the power supply terminals, and the plurality of load terminals 5 are integrally formed by being connected to the plurality of fusible bodies 4, respectively.

  The fuse accommodating portion 3a is formed by dividing a plurality of groove portions each accommodating a plurality of fusible bodies 4 by a partition wall. The load terminal accommodating portion 3b is generated by arranging a plurality of groove portions 6 each accommodating the load terminal 5 and the connecting portion (see FIG. 3) of the electric wire 9 connected to the load terminal 5 through the partition wall 7. Has been. The load terminal 5 is accommodated in the upper part of the groove 6, and the load terminal 5 is provided with a bolt 8. As shown in FIG. 3, the round terminal 10 crimped to the load electric wire 9 is a bolt 8 with a nut. The electric wire 9 is connected to the load terminal 5.

  Next, the structure of the suitable electric wire designation | designated member which concerns on the characteristic part of this invention is demonstrated. First, a plate-like base 11 extending from the bottom of the groove 6 is provided at the lower end of each partition wall 7 (7a, 7b), that is, the end of the electric wire 9 on the drawing-in side. Of the base 11, the base 11 provided at the lower ends of the partition walls 7a at both ends is integrally formed by connecting to the lower ends of the partition walls 7a. As shown in FIGS. 1C and 1D, the lower end of the partition wall 7b other than both ends is formed at a distance w from the upper surface of the base portion 11, whereby a slit 12 is formed. The slits 12 at the lower ends of the partition walls 7a at both ends are groove-shaped cuts having a width w formed along the upper surface of the base 11, and the cut depth d is a cut in the other partition walls 7b. The insertion depth is half of 2d. In the present embodiment, the depth direction of the groove 6 of the slit 12 extends to the bottom of the groove 6.

The suitable electric wire designation | designated member of this embodiment used by mounting | wearing with the slit 12 formed in this way is demonstrated with reference to FIG. As shown in FIG. 3, the suitable electric wire specifying member 13 is composed of a pair of plate members 13a and 13b. Each of the plate members 13 a and 13 b is configured such that one side edge is press-fitted into each slit 12 formed in the partition walls 7 (a and b) on both sides of the groove 6. And the space | interval D formed by the side surface which a pair of board member 13a, 13b press-fit in the slit 12 opposes is formed in the opening width corresponding to the thickness of the electric wire 9 connected to the load terminal 5 of the groove part 6. The That is, the plate member 13a (or 13b) has the same shape as shown in FIG. 2 (a) or FIG. 2 (b) so that an opening having a distance D corresponding to the thickness of the electric wire 9 is formed. It is formed. FIG (a) a pair of plate members 13a of applicable wire specified member 13 of the thickness of the wires 9 of the cross-sectional area 3sqmm ² (or, 13b) is, FIG. (B) is a cross-sectional area of 15Sqmm ² wire It is an example of a pair of plate member 13a (or 13b) of the suitable electric wire designation | designated member 13 of 9 thickness. The matching wire designating members 13 having the thicknesses of the wires 9 having other cross-sectional areas are formed in the same manner. In the present embodiment, as shown in FIG. 1B, the fitting of the suitable electric wire designating member 13 is omitted in the groove portion 6 of the load terminal 5 where the thickness of the electric wire 9 is the largest. In addition, the same fuse holder 3 can be used even when the number of the fusible bodies 4 and the load terminals 5 is small with respect to the number of the groove portions 6. Installation will be omitted.

  As described above, according to the present embodiment, the pair of plate members 13 a and 13 b formed to have a size corresponding to the thickness of the electric wire 9 connected to the load terminal 5 of the groove 6 are provided on both sides of the groove 6. It attaches to the slit 12 of the partition wall 7 by press-fitting or the like. In addition, it is not restricted to press fit, You may make it fix with an adhesive material. Then, when the fuse unit 1 is manufactured, it is adapted to the rated current of the fusible body 4 incorporated in accordance with the required specifications, and the suitable electric wire that specifies the thickness of the load electric wire 9 in each groove portion 6 of the fuse holder 3 The designated member 13 is attached. Thereby, since the thickness of the electric wire 9 of the load adapted to the rated current of the fusible body 4 of the load terminal 5 of each groove portion 6 can be identified by the adapted electric wire designating member 13, a plurality of load terminals 5 are arranged. Even if it is, erroneous connection can be prevented.

  According to this embodiment, when connecting the load electric wire 9 to the fuse unit 1, when the electric wire 9 having the round terminal 10 crimped to the load terminal 5 is fastened with the nut to the bolt 8 or after the fastening, the electric wire 9 is connected. It is accommodated in the groove 6 of the fuse holder 3. At the time of the accommodation, it is confirmed whether or not the thickness of the electric wire 9 connected to the load terminal 5 of the groove portion 6 is the same as the opening width of the suitable electric wire designating member 13. As a result, erroneous connection can be prevented. That is, since the load wire 9 must be connected to the load terminal 5 connected to the fusible element 4 of the rated current corresponding to the current capacity of the load, the thick wire having a cross-sectional area determined based on the current capacity of the load. If the wire 9 is connected to the load terminal 5 designated by the opening width of the suitable wire designating member 13, incorrect connection can be prevented. In particular, since an electric wire of an electric circuit of a vehicle such as an automobile is formed by bundling electric wires to be connected to the fuse unit 1 as a wire harness, the operator can fit an appropriate electric wire designation member having an opening width that matches the thickness of the electric wire 9. 13 can be connected without error to the load terminal 5 of the groove 6 in which 13 is mounted.

  Moreover, according to this embodiment, since the suitable electric wire designation | designated member 13 should just be mounted | worn according to the rated current of the fusible body 4 integrated according to the required specification, the fuse holder 3 has the rated current of the fusible body 4. Standardization is possible without matching the combination. That is, in the present invention, since the fuse holder 3 and the compatible electric wire designating member 13 are formed separately, for example, even if the specification of the fusible body 4 is changed or newly added, the fuse holder 3 The fuse unit 1 can be manufactured simply by changing the compatible wire designating member 13 without changing.

  On the other hand, for example, when a member corresponding to the suitable electric wire designating member 13 is formed integrally with the groove portion of the fuse holder 3 in advance, the fuse holder 3 becomes a dedicated product in which the combination of the rated currents of the fusible body 4 is determined. Therefore, the molding die must be formed individually, and the standardization problem cannot be achieved.

  Further, by automating the work of attaching the compatible wire designating member 13 to each groove portion 6 of the standardized fuse holder 3, erroneous connection can be further prevented. For example, the product number of the fuse unit 1 and the product number of the compatible wire designating member 13 can be collated and automatically assembled. Moreover, the type of the suitable electric wire designation | designated member 13 is color-coded, or the identification mark showing the thickness of an electric wire is attached | subjected, and the best countermeasure can be taken so that an operator may not make a mistake when the wire harness is assembled.

(Second Embodiment)
With reference to FIG.4 and FIG.5, the structure of other embodiment of this invention is shown. This embodiment is different from the first embodiment in the configuration of the compatible electric wire designating member according to the feature of the present invention and the slit in which the compatible electric wire designating member is mounted. Since other configurations are the same as those of the first embodiment, the same portions are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 5, the suitable electric wire designating member 23 according to the feature of the present embodiment is provided with a notch 24 at the front end side of the opposite side edge portions of a pair of flat plate members 23 a (23 b). It is in providing. In accordance with this, as shown in FIGS. 4 (c), 4 (d), and FIG. 5, the slit 25 provided at the connecting portion between the lower end of the partition wall 7 and the base 11 is formed from the front side of the partition wall 7 to the middle. doing. Therefore, when the pair of plate members 23a and 23b are press-fitted into the slit 25, the surface on the x-axis side in the drawing is positioned by bringing the A surface of the notch portion 24 into contact with the inner surface of the groove portion 6 of the partition wall 7. By bringing the B surface of the portion 24 into contact with the inner surface of the slit 25, the illustrated z-axis surface is positioned. Thereby, positioning at the time of press-fitting of the pair of plate members 23a and 23b can be facilitated. In this embodiment, instead of press-fitting the pair of plate members 23a and 23b, the plate member 23a and 23b can be fixed to the slit 25 with an adhesive.

  According to this embodiment, the same effects as those of the first embodiment can be obtained. Moreover, according to this embodiment, since the positioning accuracy of the suitable electric wire designation | designated member 23 is stabilized, the accuracy of the opening width of a pair of board member 23a, 23b is stabilized, and the thickness of the suitable electric wire 9 is confirmed without an error. can do. Furthermore, since the lower end of the partition wall 7 can be reinforced by the base 11, the strength of the partition wall 7 can be improved.

(Third embodiment)
With reference to Fig.6 (a), (b), the structure of the slit to which the suitable electric wire designation | designated member of other embodiment of this invention and its suitable electric wire designation | designated member are mounted | worn is demonstrated. The suitable electric wire designating members 13 and 23 of the first and second embodiments are constituted by a pair of plate members 13a and 13b or 23a and 23b. As shown in FIG. 6A, the suitable electric wire designating member 33 of the present embodiment is formed in a box shape. The load terminal accommodating part 3b of this embodiment is comprised similarly to the 1st, 2nd embodiment. And as shown to FIG. 6 (a), (b), the suitable electric wire designation | designated member 33 of this embodiment is a pair of wall 35 which contact | connects the inner surface of the partition wall 7 of the both sides of each groove part 6, and a pair of wall 35 Has a bottom plate 36, a pair of walls 35 and a plate member 37 provided on the front surface of the bottom plate 36, and is formed in a box shape. And the opening 38 of the space | interval D corresponding to the thickness of the electric wire 9 is formed in the plate member 37. FIG.

  In the plate member 37 of the suitable electric wire designating member 33 of the present embodiment, both ends corresponding to the groove width direction of the groove portion 6 protrude from the outer surfaces of the pair of walls 35 by ½ = d of the depth 2d of the slit 25. A protruding portion 37 a is formed, and the plate thickness is formed to the width w of the slit 25. Similarly to the notch 24 shown in FIG. 5, the plate member 37 has a surface 39 that contacts the inner surface of the groove 6 of the partition wall 7 and a surface 40 that contacts the inner surface of the slit 25. A notch 37b is formed.

As shown in FIG. 6 (b), the adapted electric wire designating member 33 configured in this way is slid while placing the plate member 37 on the upper surface of the base portion 11 with the pair of walls 35 facing upward, The protruding portion 37 a is press-fitted into the slit 25 of the partition wall 7. Then, the surface 40 of the notch 37 b of the plate member 37 is mounted in contact with the inner surface of the slit 25. Further, on the inner surface of the bottom plate of the suitable electric wire designating member 33, a code indicating the thickness of the electric wire 9, for example, “3” indicating 3 sqmm ² in the illustrated example is displayed by engraving or the like.

  With this configuration, according to this embodiment, the same effect as that of the first embodiment can be obtained. Further, as in the second embodiment, the positioning accuracy of the compatible wire designating member 33 is stabilized. In particular, according to the present embodiment, since the opening width that specifies the thickness of the electric wire 9 can be defined by the opening 38 of one plate member 37, the accuracy of the opening width is stabilized, and the thickness of the matching electric wire 9 is further increased. Can be confirmed without error. Furthermore, when the assembly | attachment of the suitable electric wire designation | designated member 33 to the fuse unit 1 is performed automatically, the structure of an assembly apparatus can be simplified.

DESCRIPTION OF SYMBOLS 3 Fuse holder 3a Fuse accommodating part 3b Load terminal accommodating part 4 Soluble body 5 Load terminal 6 Groove part 7 (7a, 7b) Partition wall 9 Electric wire 10 Round terminal 11 Base 12, 25 Slit 13, 23, 33 Applicable electric wire designation member 13a , 13b Plate member 23a, 23b Plate member

Claims (4)

A power supply terminal to which a battery power supply is connected, a plurality of fusible bodies formed by branching from the power source terminal and fused by overcurrent, and a plurality of load terminals respectively connected to the fusible bodies are integrally formed, The fusible body and the load terminal are accommodated in a resin-made fuse holder, and the fuse holder has a plurality of grooves each accommodating the load terminal and a connecting portion of an electric wire connected to the load terminal. In the fuse unit arranged through,
Each groove is formed on at least a part of the front side of the partition wall so that a compatible wire designating member having an opening with a width corresponding to the thickness of the wire connected to the load terminal can be mounted. Features a fuse unit. A slit is formed on each partition wall on both sides of each groove from the front of the groove toward the bottom of the groove,
The suitable electric wire designating member is composed of a pair of plate members, and the side edges of one plate member are formed so as to be press-fit into the slits of one of the partition walls, and the side edges of the other plate member are formed of the other partition wall. 2. The fuse unit according to claim 1, wherein the opening is formed so as to be press-fitted into the slit, and the width of the opening is set by an interval at which the other side edges of the pair of plate members face each other. The slit is formed from the groove front of the partition wall to the middle of the groove,
The side edge of the plate member is formed such that a front end portion thereof is in contact with an inner surface of the groove of the partition wall and a side surface extending from the front end portion to the rear end portion can be press-fitted into the slit. The fuse unit described in 1. A slit is formed on each partition wall on both sides of each groove from the front of the groove toward the bottom of the groove,
The compatible electric wire designating member includes a bottom plate corresponding to a bottom portion of the groove portion, a pair of wall plates erected from side edges corresponding to the partition walls on both sides of each groove portion of the bottom plate, and the pair of wall plates And a plate member provided at the lower end of the bottom plate,
The plate member is formed with a protruding portion in which both ends corresponding to the groove width direction of the groove portion protrude from the outer surfaces of the pair of walls by the depth of the slit, and the plate thickness is formed to the width of the slit, 2. The fuse unit according to claim 1, wherein an opening having a width corresponding to a thickness of the electric wire is formed at an edge of the front surface side of the plate member.

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