JP2563316Y2 - Branch junction box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement of a branch junction box used for interconnecting wire harnesses.

[Conventional technology]

The branch junction box is used, for example, as a so-called junction box in electric wiring of an automobile, and has an effect of absorbing a joint portion of a wire harness to simplify a wiring form.

As a method of forming branch circuits in a concentrated manner, as shown in FIG.
2A is accommodated in the upper case 3 and the lower case 4 in parallel, and an electric wire is press-fitted into the U-shaped slot 6a of the press-contact portion 6 of the press-contact terminal 5, and the branch tab 7 of the press-contact terminal 5 is projected from the hole 3a of the upper case 3. There is one in which a connector insertion portion 8 is formed, and a connector 9 of another connection wire group 2B is inserted into the insertion portion 8 (Japanese Patent Application Laid-Open No. 61-45576).

As another method, the applicant previously fitted one side edge of the linear bus bar 10 into the bus bar accommodating groove 4a of the lower case 4 ', as shown in FIG. The other side edge is also a U-shaped slot of the press contact portion 6 'of the press contact terminal 5'.
A structure for press-fitting into 6a 'was proposed. (JP-A-61-131708
issue).

[Problems to be solved by the invention]

Since the branch connection box shown in FIG. 12 is integrated with the wire harness 1, the integration cannot be performed separately, which is inconvenient in terms of process management and inventory management. Also,
In the branch junction box shown in FIG. 13, the gap D between the adjacent bus bars 10 ₁ and 10 ₂ is restricted by the width D ′ of the press contact terminal 5 ′ (D>
D '), high-density arrangement is not possible, and it is easy to increase the size. Further, the bus bar 10 and the pressure contact terminal 5 'are rigid bodies formed by punching a copper alloy such as copper-zinc or a metal plate partially or wholly tinned on the surface thereof.
When covering the upper case 3 as shown in FIG.
If there is a deviation between the pressure contact terminal 3a and the hole 3a, the press contact terminal 5 'is inclined, the press contact portion 6' is twisted, and a plastic deformation exceeding the elastic limit occurs, which may result in poor conduction.

The present invention has been made in consideration of the above problems,
An object of the present invention is to provide a branch connection box that has a high wiring density of a bus bar, can be formed small and compact, and does not cause poor contact between the branch tab and the bus bar.

[Means for solving the problem]

In order to solve the above-mentioned problem, the branch junction box according to the present invention has a plurality of busbar accommodating grooves arranged at equal intervals in a lower case as described in claim 1, and a tab connecting portion on one side edge. A branch connection box formed by fitting another side edge of a bus bar having a branch tab protruding therethrough into the bus bar receiving groove, and projecting the branch tab to a connector insertion portion of an upper case; The part is composed of a rising piece extending from one side edge of the bus bar and a tab connecting piece extending on one side or both sides of the rising piece, and the branch tab is formed by bending the tab connecting piece at a right angle to the plate surface of the bus bar. The tab connecting piece is extended so as to intersect with an adjacent bus bar as necessary, and a branch tab is also protruded at the extended portion to extend the tab connecting piece. Leak on one side edge of the bus bar crossing the installation part Characterized in that a cutout for stop.

To more reliably prevent leaks between busbars,
As described in claim 2, it is preferable that the notch and the opposing tab connecting piece are respectively provided with a folded piece.

Further, as another leak preventing means, an insulating plate having a plurality of insertion slits corresponding to the tab connection portion of each bus bar is provided as described in claim 3, and each branch tab and the tab connection portion are connected to the insertion slit. It is also preferable that the insulating plate is slid in a state where the insulating plate is protruded from the bus bar, and the insulating plate is fitted between each bus bar and the tab connecting portion.

[Action]

Since the branch tab is provided integrally with the bus bar, unlike the structure using the conventional pressure contact terminals 5, 5 '(Figs. 12 and 13), there is no risk of poor contact and the pressure connection process can be omitted, so the branch connection is made. The number of box assembly steps is also reduced.

The interval between the busbars and the busbars may be slightly wider than the bending width of the tab connecting piece (or the width of the branch tab).
As a whole, it can be arranged with high density, and is suitable for small size and compact size.

Further, when it is necessary to derive three or more branch tabs from a part of the bus bar, the tab connecting piece may be extended so as to cross the adjacent bus bar, and the branch tab is connected to the connector (or connector insertion portion). It is easy to align the units.

Further, by providing a cutout in the bus bar intersecting with the tab connecting piece, it is possible to prevent a leak between the adjacent bus bars.

However, a folded piece is provided at the intersection (claim 2).
Alternatively, the effect of preventing leakage can be enhanced by interposing an insulating plate between the tab connecting portion and the bus bar (claim 3).

Hereinafter, the above configuration and operation will be described with reference to the drawings showing the embodiments.

〔Example〕

FIG. 1 is an exploded perspective view of a branch junction box according to the present invention.

In the figure, reference numeral 11 denotes an upper case, a plurality of connector insertion portions 12A, 12B,... Are erected on the upper surface thereof, and a plurality of tab insertion holes 13 are arranged in a bottom wall of each connector insertion portion. .
Reference numeral 14 denotes a lower case, on the upper surface of which a plurality of busbar accommodating grooves 15 are juxtaposed at a constant pitch P. Reference numerals 16 and 17 denote locking portions and locking claws which constitute locking means for the upper case 11 and the lower case 14.

Reference numeral 18 denotes a linear bus bar, a plurality of branch tabs 19 projecting from an upper edge thereof via a tab connecting portion 20, and a lower edge is fitted and fixed in the bus bar receiving groove 15, and each branch tab 19 Are connected to the connector insertion portions 12A, 12B.
..., and the corresponding connector of the terminal of the wire harness (not shown) is inserted.

FIG. 2 is an enlarged perspective view of a part of the bus bar 18 group in FIG. In FIG. 2, in order to distinguish the bus bars in each row, reference numerals 18 ₁ , 18 ₂ , 18 ₃ , and 18 ₄ are given in order from the near side.

At the upper edge of the bus bar 18 _1, the connector insertion portions 12 A, 1
At a pitch corresponding to 2B, a T-shaped tab connecting portion 20 composed of a rising piece 20a and tab connecting pieces 20b, 20b extending from both sides thereof is connected. Branch tabs 19 are protruded from the ends of the tab connecting pieces 20b on both sides, and the two tabs are bent at right angles to the plate surface of the bus bar 18 ₁ so that the two branch tabs 19 are connected to the bus bar 18 ₁ and the bus bar. It is formed to project laterally so as to position and opposed to between 18 _2. In some cases, one or both of the two branch tabs 19 may be bent to opposite sides as indicated by phantom lines.

FIG. 3A is a development view in which the bus bar 18 ₁ , the tab connecting portion 20 and the branch tabs 19, 19 are integrally punched from a single conductive metal plate. bus bar 18 ₁ is formed with two branch tab 19.

Bus bar 18 ₁ having the symmetrical T-shaped tab connection portion 20 is the basic structure of a bus bar for use in branch joint box of the present invention.

Bus bars 18 ₂ have the same tab connecting portions and the in the center, each connecting T-shaped tabs asymmetrical on the left and right portions 21
And 22. Figure 3 b shows a developed view of such bus bars 18 ₂ and the tab connecting portions 20, 21 contiguous thereto.

Tab connection portion 21 extends the tab connecting pieces 21b of the leftward and intersecting the bus bar 18 ₃ adjacent its tip busbar 18 ₃ and 18 ₄
, Two branch tabs 19 are protruded, and the right tab connecting piece 21b 'is the same as the basic structure. Similarly, the tab connection portion 22, the tab connecting pieces 22b of the left is the same as 21b, the tab connecting pieces 22b of the right 'extends beyond the bus bars 18 _4, having three branches tab 19.

The busbar 18 ₃ and 18 ₄ of the tab connecting pieces 21b, 22b, 22
A notch 23 is provided at the intersection with b 'to prevent leakage between the bus bars. Needless to say, busbar 18 ₃
The branch tab 19 is not provided in the notch 23 portion such as.

Thus, the tab connection piece 21b of the tab connecting portions 21 and 22 if necessary, by extending to intersect with the adjacent bus bars 18 ₃ as 22b, fetches the plurality of branch tabs 19 from the same site of the bus bar , And the branch tabs 19 can be aligned and arranged for each of the connector insertion portions 12A, 12B.

As is clear from FIG. 2, the pitch P between the busbars
Should be slightly wider than the width W of the branch tab 19 (or the bending width of the tab connecting piece 20b), and a plurality of bus bars 18 ₁ , 1
8 ₂ , 18 ₃ … can be densely arranged. Tab connecting piece 21b
As in, even when the extending and intersecting the bus bar 18 ₃ adjacent, the pitch P does not change. In addition, bus bar 18 ₁ , 1
As shown in FIGS. 3a and 3b, a group of branch tabs 19 continuous with _{2 and the} like can be easily formed by punching and bending from a conductive metal plate, so that each branch tab 19 and the connector insertion portion 12A, Positioning with respect to the tab insertion hole 13 such as 12B can be performed accurately.

Fourth embodiment shown in Figure and Figure 5 is partially tin-plated copper as described above - the tab connected to the notch 23 and facing the each formed from zinc alloy bus bar 18 (18 _{1-18 4)} The tab connecting pieces 21b and 22b of the parts 21 and 22 are provided with 180 ° folded pieces 24 and 25, respectively, so that the leakage can be more reliably prevented.

That is, in FIG. 2, the conductive metal is exposed on the surface S of the notch 23 and the lower end surfaces S of the tab connecting pieces 21b and 22b facing the cutout 23 for punching the bus bar 18 and the branch tab 19. Therefore, if a water droplet is present during that period to form a bridge, a leak phenomenon easily occurs.

However, when the folded pieces 24 and 25 are provided as in the present embodiment, the tin-plated layer, which is a defective conductor, exists on the opposing surface, and even when a bridge is formed by water droplets, water directly contacts the conductor metal. Leakage is less likely to occur.

Instead of the 180 ° folded pieces 24, 25, 90 ° folded pieces 24 ', 25' may be used as shown in FIGS. 6 and 7.

In the embodiment shown in FIGS. 8 to 11, an insulating plate 26 is interposed between the group of bus bars 18 and the group of branch tabs 19 to prevent leakage between the bus bars.

As shown in FIG. 9a, each bus bar 18
Corresponding to the arrangement of the branch tabs 19, the U-shaped insertion slit 27 for the tab connection portion 20 of the basic structure, and the insertion slit 27 corresponding to the tab connection portions 21 and 22 having different numbers of poles of the branch tab. ', 27 "has been established.

Then, as shown in FIG. 9b, in a state where the bus bars 18 are fitted to the lower case 14 (see FIG. 1), an insulating plate 26 is put on the bus bars 18 from above, and the branch tabs 19 and the tab connecting portions 20 are placed. ~
22 is pierced through the insertion slits 27-27 "and then slid in the direction of arrow R as shown in FIG. 9c.

Then, as shown in FIGS. 10 ac and 11 ac, the insulating plate 26 is fitted and fixed between each bus bar 18 and the tab connecting portions 20 to 22, and the insulating plate 26 is And the adjacent bus bar 18 are insulated from each other. Further, since the tab connecting portions 20 to 22 and the branch tabs 19 are displaced from the insertion slits 27 to 27 ″ by the slide, even if water drops adhere to the branch tabs 19 protruding from the insulating plate 26, the tab connecting pieces are not separated. 20
There is no risk of forming a bridge with the adjacent bus bar 18 via b (21b, 22b), and the leak prevention effect can be further enhanced.

According to this embodiment, there is no need to provide the notch 23 for the tab connecting pieces 20b to 22b extending across the bus bar 18 in FIG. 2, so that the height of the entire branch connection box can be reduced.

[Effect of the invention]

As described above, according to the present invention, since the branch tab is formed integrally with the bus bar, there is no risk of poor contact when using the conventional press contact terminal, and the arrangement density of the bus bar is increased. It is possible to provide a branch connection box which is small, compact, and requires a small number of assembling steps and is easy to assemble.

In addition, a notch for preventing leakage is provided in the bus bar intersecting with the extended portion of the tab connecting piece in the tab connecting portion, or a folded piece is provided in the opposing portion, thereby preventing leakage between adjacent bus bars, Since the insulating plate is interposed between the tab connecting portion and the bus bar, the leak preventing effect is further enhanced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of the branch junction box according to the present invention, FIG. 2 is an enlarged perspective view of a part of the bus bar group of FIG. 1, and FIGS. 3a and 3b are bus bars 18 ₁ and 18 in FIG. _Two
FIG. 4 is an enlarged perspective view of a part of a bus bar group showing another embodiment of the present invention, FIG. 5 is a sectional view taken along line VV of FIG. 4, and FIG. 6 is a sectional view of FIG. FIG. 7 is an enlarged perspective view of a part of a bus bar group showing a modification, FIG. 7 is a sectional view taken along line VII-VII of FIG. 6, FIG. 8 is an exploded perspective view of another branch junction box according to the present invention, FIG. To c are the bus bar 18 groups and the insulating plates in FIG. 8, respectively.
FIG. 10 is an enlarged perspective view showing an assembling process with 26, FIGS. 10a to 10c are cross-sectional views of the assembling process along the line XX of FIG. 9, and FIGS. 11a to 11c are XI-XI of FIG. 12 and 13 are exploded perspective views of a conventional branch junction box, respectively, and FIG. 14 is an operation explanatory view of the press contact terminal in FIG. 11 ... upper case, 12A, 12B ... connector insertion portion, 14 ... lower case, 15 ... busbar accommodating groove 18 _1, 18 ₂ ~ ... bus bar, 19 ... branch tabs, 20, 21, 22 ... tab connecting portions , 20a ... rising piece, 20b, 21b, 22b ... tab connecting piece, 23 ... notch, 24, 24 ', 2
5, 25 '... folded piece, 26 ... insulating plate, 27, 27', 27 "... insertion slit.

Claims (3)

(57) [Scope of request for utility model registration] A plurality of busbar accommodating grooves are arranged in the lower case at equal intervals, and the other side edge of a busbar having a branch tab protruding from one side edge via a tab connecting portion is fitted into the busbar accommodating groove. A branch connection box formed by attaching the branch tab to a connector insertion portion of an upper case, wherein the tab connection portion extends from one side edge of a bus bar and extends to one side or both sides of the rising piece. A tab connecting piece, wherein the branch tab is formed so as to protrude laterally by bending the tab connecting piece at a right angle to the plate surface of the bus bar, and crosses the tab connecting piece with an adjacent bus bar. A branch tab protruding from the extended portion, and a notch for preventing leakage is provided at one side edge of the bus bar intersecting with the extended portion of the tab connecting piece. Connection box. 2. The junction box according to claim 1, wherein the notch and the opposite tab connecting piece are provided with a turn-back piece, respectively. 3. A busbar having a plurality of busbar accommodating grooves arranged at equal intervals in a lower case, and the other side edge of a busbar having a branch tab protruding from one side edge via a tab connecting portion is fitted into the busbar accommodating groove. A branch connection box formed by attaching the branch tab to a connector insertion portion of an upper case, wherein the tab connection portion extends from one side edge of a bus bar and extends to one side or both sides of the rising piece. A tab connecting piece, wherein the branch tab is formed so as to protrude laterally by bending the tab connecting piece at a right angle to the plate surface of the bus bar, and crosses the tab connecting piece with an adjacent bus bar. A branch tab is also protruded from the extending portion, and an insulating plate having a plurality of insertion slits corresponding to the tab connection portion of each bus bar is provided, and each branch tab and the tab connection portion are inserted through the insertion plate. Let it protrude through the slit A branch connection box characterized in that the insulating plate is slid in a state where the insulating plate is slid and the insulating plate is fitted between each bus bar and the tab connecting portion.