JP4333049B2 - Fuse housing - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fuse housing. More specifically, the present invention relates to a fuse housing that protrudes from an outer surface of a case in an electrical connection box such as a fuse box, a relay / fuse box, or a junction box. The present invention relates to a fuse housing in which a short fuse, in which an input / output terminal is exposed and an input / output terminal hardly protrudes from a front end surface of a case on the insertion side of the fuse housing, is inserted.
[0002]
[Prior art]
Many fuses are mounted in electrical junction boxes such as fuse boxes, relay / fuse boxes, and junction boxes. If the height of these fuses is lowered, the height of these electrical junction boxes can be lowered. In addition, the bus bar accommodated in the electrical junction box and the fuse terminal are conventionally connected via a relay terminal, but the relay terminal is eliminated and the tab protruding from the bus bar and the fuse terminal can be directly connected and Then, the configuration in the electrical junction box can be simplified and the height of the electrical junction box can be further reduced.
Therefore, the present applicant previously provided a fuse with a reduced height in Japanese Patent Application Nos. 2000-245175, 2000-300450, etc., and connected the input / output terminals of the fuse via the bus bar tab and the relay terminal. It provides a structure to connect without connecting.
[0003]
As shown in FIGS. 7A and 7B, the fuse 10 includes a case 1 made of insulating resin, a pair of left and right input terminals 2 and output terminals 3 partially embedded in the case 1, and these The input terminal 2 and the output terminal 3 are composed of a conductor composed of a continuous fuse fusing part 4, and the front end surfaces of the input terminal 2 and the output terminal 3 are slightly projected from the end surface 1 a on the insertion side of the case 1, Alternatively, the positions are substantially the same, and the notches 1b are formed on both the left and right sides of the case 1 so that the input terminal and the output terminal are partially exposed from the front end surfaces of the input terminal 2 and the output terminal 3 over a range of a required length. It is set as the structure which provided.
[0004]
As shown in FIG. 8, the fuse 10 is press-connected to a tab 6 having a press-contact slot 6a formed on the bus bar 5, so that the input / output terminal of the fuse is directly connected to the tab of the bus bar without using a relay terminal. Connectable.
[0005]
The fuse housing 9 for housing the short fuse 10 has a structure shown in FIGS.
That is, a pair of left and right side walls 7 and 8 are provided, and these left and right side walls 7 and 8 hold the left and right side portions of the fuse case 1 from the outside.
Tabs 6A and 6B provided on the bus bars 5A and 5B are projected from the bottom side into the space (cavity) S sandwiched between the left and right side walls 7 and 8, and the input / output terminals of the fuse 10 are inserted into the pressure contact slots of the tabs 6A and 6B. 2 and 3 are inserted to make pressure contact.
[0006]
[Problems to be solved by the invention]
The fuse housing 9 has only a pair of left and right side walls 7 and 8 projecting, and bus bar tabs 6A and 6B project from a space S sandwiched between the left and right side walls, so to speak, the tabs 6A and 6B. Since it is erected in the space S in a bare state, when the fuse 10 is inserted, the tabs 6A and 6B are deformed inwardly adjacent to each other as shown by arrows in FIG. There's a problem.
Thus, when the tabs 6A and 6B are deformed, it becomes difficult to push in the input terminal 2 and output terminal 3 of the fuse from the tip of the press contact slot, and there is a problem that insertion workability is deteriorated.
[0007]
Further, since both the left and right narrow side portions of the fuse 10 are held by the left and right side walls 7 and 8 of the fuse housing and the wide side is not protected, there is a problem that it is susceptible to external interference and has poor stability. . Thus, if the fuse 10 is not securely positioned and held in the fuse housing 9, the fuse is easily deformed, and the electrical connection reliability between the input / output terminals 2 and 3 and the tabs 6A and 6B is easily achieved. There is also a problem of lowering.
[0008]
The present invention has been made in view of the above problems, and it is an object of the present invention to prevent the deformation of the tab of the bus bar and to reliably hold the fuse in a stable state in the fuse housing.
[0009]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a case made of an insulating resin, an input terminal having one side disposed inside the case, an output terminal, and a conductor including a fuse blown portion connecting the input / output terminals. The front end surfaces of the input terminal and output terminal are the same as or slightly projecting from the end surface of the case, and the input terminal and output terminal extend from the front end surface of the input terminal and output terminal over a required length range. Is a fuse housing in which notches are provided on both the front and back sides of the case so that the fuse is attached, and a fuse having an exposed portion of the input terminal and the output terminal as an electrical contact portion with the counterpart terminal is attached,
A pair of right and left side walls shaped to embrace the right and left narrow section of the upper listen over scan from the outside, located between the left and right side walls, a lower back a wide covering the front and rear wide surface of the upper listen over scan With front and rear protective walls,
From the bottom side in the cavity surrounded by the left and right side walls and the front and rear protective walls, tabs at the ends of the bus bars that are press-contacted to the input terminals and the output terminals of the fuses are projected, and the inner surfaces facing each of the pair of tabs are A fuse housing is provided in which tab holding ribs projecting from the left and right ends of the front and rear protective walls are in contact.
[0010]
Specifically, the pair of tabs are provided with a pressure contact slot from the tip, and the fuse input terminal and the output terminal are press-fitted into the pressure contact slot with the wide surface orthogonal to the wide surface of the fuse input terminal and output terminal. The narrow side surfaces of the tabs are in contact with and sandwiched between the inner surfaces of the left and right side walls, and the front and rear edges of the opposing inner surfaces of the wide surface are in contact with the tab pressing ribs. To be.
[0011]
According to the above configuration, between a pair of left and right side walls, provided with front and rear protective walls, because it protects the wide surface of the to case, four sides of the case is to be surrounded by a wall, stabilizing the fuse And can be positioned and held.
In addition, the tab holding ribs that contact the inside of the bus bar tab protrude from the left and right ends of the front and rear protective walls, preventing the tab from falling inward, even if a load is applied to the tab when the fuse is inserted. The tab does not fall inward, and the press input / output terminal can be accurately pushed into the press contact slot of the tab to achieve press contact connection.
[0012]
The tab holding ribs at the left and right ends are changed in height, and one is protruded from the upper end of the tab and the other is substantially at the same position as the upper end of the tab.
When the tab pressing rib is higher than the tab, the tab falling prevention function can be enhanced. On the other hand, it is necessary to bring a continuity inspection jig into contact with the tab during continuity inspection. For this reason, the tab holding ribs to be brought into contact with the front and rear edges on the inner surface side of the tab are heightened to enhance the tab collapse prevention function, while the other is substantially equal to the height of the tab, and a continuity inspection jig is provided at the upper end of the tab. It can be made to contact.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
A large number of fuse housings 20 shown in FIG. 1 to FIG. 3 are provided in parallel with a fuse block case 21, and the fuse housing 20 accommodates the short fuse 10 shown in FIG.
[0014]
As in the conventional example shown in FIG. 9, each fuse housing 20 has a pair of left and right side walls 2223 projecting at a predetermined interval, and these left and right side walls 22, 23 have a U-shaped holding portion 22 a, 23a and front and rear flanges 22b and 22c, 23b and 23c projecting outward from both ends thereof.
[0015]
The portions sandwiched between the left and right front and rear flanges 22b and 23b and 22c and 23c are openings in the prior art shown in FIG. 7, but in this embodiment, the front and rear protective walls 24 and 25 that are short and wide are provided. Standing up.
[0016]
There is a bottom wall 26 at the center of the bottom surface of the cavity (space) S surrounded by the left and right side walls 22 and 23 and the front and rear protective walls 24 and 25, and the bus bar 5 is provided between the bottom wall 26 and the left and right side walls 22 and 23. Openings 27 and 28 for projecting 5 are provided.
[0017]
The tabs 6A and 6B provided on the upper portions of the bus bars 5A and 5B are projected into the space S through the openings 27 and 28 through the bus bars 5A and 5B.
The tabs 6A and 6B protrude to a position where the inner end openings of the holding portions 22a and 23a on the left and right side walls are closed, and the narrow surfaces TS before and after the tabs abut against the front and rear surfaces of the holding portions 22a and 23a. Are arranged opposite to each other with a space therebetween.
Slots 6s for terminal pressure contact are cut from the tips of the tabs 6A and 6B, and the upper ends of these tabs 6A and 6B coincide with the heights of the front and rear protective walls 24 and 25.
[0018]
Tab pressing ribs 30 and 31, 32, and 33 are provided on the opposing inner surfaces of the left and right ends of the front and rear protective walls 24 and 25, respectively, and are brought into contact with the inner surfaces of the opposing wide surfaces WS of the tabs 6A and 6B. Yes.
Specifically, the tab pressing ribs 30 and 32 are brought into contact with both front and rear edges of the inner surface of the wide surface WS of the tab 6A, and the tab pressing ribs 31 and 33 are brought into contact with both front and rear edges of the inner surface of the wide surface WS of the tab 6B. I am letting.
[0019]
Further, the tab pressing ribs 30 and 31 provided at the left and right ends of the front protective wall 24 are such that the left tab pressing rib 30 is larger than the height of the tab 6A, and the right tab pressing rib 31 is the same as the height of the tab 6B. On the other hand, in the rear protective wall 25, the left tab pressing rib 32 is the same as the height of the tab 6A, and the right tab pressing rib 33 is larger than the height of the tab 6B.
[0020]
When the fuse housing 20 is configured as described above, the tabs 6A and 6B are tilted inward because the tab pressing ribs 30 and 32, 31 and 33 are brought into contact with the front and rear edges of the wide surface WS. Is prevented. Since the holding walls 22a and 23a of the left and right side walls 22 and 23 exist outward, the fall is prevented.
[0021]
Therefore, when the fuse 10 is inserted into the fuse housing 20 and the input terminal 2 is pushed into the tab 6A and the output terminal 3 are pushed into the slots 6s of the tab 6B, the tabs 6A and 6B do not fall inwardly and outwardly. Positioned and held in position, the input / output terminals 2 and 3 can be smoothly inserted into the slots 6s of the tabs 6A and 6B for pressure contact.
[0022]
When the fuse 10 is completely inserted into the fuse housing 20, the upper end surface of the case 1 coincides with the upper ends of the left and right side walls 22, 23 as shown in FIG. 3, and the fuse 10 is completely accommodated in the space S. Is done. In this state, lower portions of the front and rear wide surfaces of the case 1 are covered with the front and rear protective walls 24 and 25. The narrow left and right end faces of the case 1 are in contact with and sandwiched between the left and right side walls 22 and 23, and the left and right side portions are held by the left and right side walls 22 and 23 from the outside. Four sides are protected and regulated by the wall of the fuse housing 20.
[0023]
As described above, since the four sides of the case 1 are protected by the wall of the fuse housing 20 in a state where the input / output terminals 2 and 3 of the fuse 10 are in pressure contact with the tabs 6A and 6B, the positioning and fixing are stably performed. The external interference material is less likely to interfere with the fuse 10, and the electrical connection reliability can be improved without causing deformation of the fuse 10.
[0024]
Further, before inserting the fuse 10, as shown in FIG. 6, when inserting a continuity test jig G into the tabs 6A and 6B and performing contact inspection, the ribs 31 and 32 on one side of the tab pressing rib are connected to the tab 6A. Therefore, when the jig G is inserted obliquely through the opening at the front end of the fuse housing 20, the front end of the jig G can be brought into contact with the upper end surfaces of the tabs 6A and 6B.
[0025]
【The invention's effect】
As is clear from the above description, in the fuse housing of the present invention, the tab pressing rib that abuts against the tab of the bus bar protruding into the space (inside the cavity) is provided. The tab does not fall down when the pressure connection is made, and the pressure contact work can be performed smoothly.
[0026]
Conventionally, the right and left side portions of the fuse are only held so as to be held from the outside. However, in the present invention, the front and rear wide surfaces are also covered with the front and rear protective walls. Can be held stably. As a result, it is difficult for external force to act on the fuse, and the reliability of electrical connection with the tab can be improved.
[Brief description of the drawings]
FIG. 1 is a plan view of fuse housing according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
FIG. 3 is a perspective view of a main part.
FIG. 4 is a diagram showing a state in which a fuse is inserted into a fuse housing.
FIG. 5A is a front view showing a pressure connection state between a fuse terminal and a tab, and FIG. 5B is a side view.
FIG. 6 is a view showing a state in which a continuity inspection jig is inserted into a fuse housing and brought into contact with a tab.
7A is a front view of a fuse, and FIG. 7B is a side view.
FIG. 8 is a drawing showing a pressure connection state between a fuse and a bus bar tab.
9A and 9B show a conventional fuse housing, in which FIG. 9A is a plan view and FIG. 9B is a cross-sectional view taken along line BB of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Case 2 Input terminal 3 Output terminal 5 (5A, 5B) Bus bar 6A, 6B Tab 6s Pressing slot 10 Fuse 20 Fuse housing 22, 23 Left and right side walls 24, 25 Front and rear protective walls 30-33 Tab pressing rib

Claims (3)

It is composed of an insulating resin case, and an input terminal having one side disposed inside the case, an output terminal, and a conductor comprising a fuse blown portion connecting the input / output terminals. The front end surface is the same as or slightly protruding from one end surface of the case, and the front and back sides of the case are exposed so that the input terminal and output terminal are partially exposed from the front end surface of these input terminals and output terminals over the required length range. A fuse housing in which notches are provided on both sides and a fuse having an exposed portion of the input terminal and the output terminal as an electrical contact portion with a counterpart terminal is attached,
A pair of right and left side walls shaped to embrace the right and left narrow section of the upper listen over scan from the outside, located between the left and right side walls, a lower back a wide covering the front and rear wide surface of the upper listen over scan With front and rear protective walls,
From the bottom side in the cavity surrounded by the left and right side walls and the front and rear protective walls, tabs at the ends of the bus bars that are press-contacted to the input terminals and the output terminals of the fuses are projected, and the inner surfaces facing each of the pair of tabs are A fuse housing, wherein tab holding ribs projecting from left and right ends of the front and rear protective walls are in contact with each other.   2. The fuse housing according to claim 1, wherein the tab holding ribs at the left and right ends are changed in height so that one protrudes from the upper end of the tab and the other is positioned substantially at the same position as the upper end of the tab. The pair of tabs tip slot for terminal pressure is provided from, the wide sides by perpendicular to the wide surface of the input and output terminals of the fuse, the input and output terminals of the fuse into the slot for the terminal pressure We are connected by press fitting,
2. The narrow surfaces on both sides of each tab are in contact with and sandwiched between the inner surfaces of the left and right side walls, and the front and rear edges of the opposing inner surfaces of the wide surfaces are in contact with the tab pressing ribs. The fuse housing according to claim 2.

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