JP2001112145A - Bus-bar wiring board construction for electrical connection box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide bus-bars wiring board construction for electrical connection boxes which makes a wiring board compact, and ensures capability for insulation between tab terminals and prevention of leakage current. SOLUTION: In a bus-bar wiring board construction 20 for electrical connection boxes of this construction, insulating wiring boards 21, 23 and a plurality of bus-bars formed for wiring are laminated. Tab terminals 25A, 25B formed joining to the bus-bars 22A, 22B are projected from through-holes 24 of the wiring board 21. Also a projecting rib 28, having a cross section of an acute angle, is formed for preventing generation of a conductive route by adhesion of water, etc., to the upper end of a leakage preventing partition wall 27 formed between the adjoining bus-bars 22A, 22B of the wiring board 21, along with using the partition wall 27 together by both bus-bars 22A, 22B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric connection box for preventing the occurrence of a leak current on a wiring board when water or the like enters an electric connection box used for electric wiring of an automobile or the like. The present invention relates to a bus bar wiring board structure.

[0002]

2. Description of the Related Art Conventionally, electric connection boxes such as junction boxes (J / B) and relay boxes used for electric wiring of automobiles and the like are provided with bus bars 2A and 2B on both front and rear surfaces as shown in FIG. A plurality of wiring boards 1 are stacked in multiple stages. The bus bar 2A of the wiring board 1 of each layer,
A tab terminal 5 is provided upright from 2B and protrudes above the wiring board 1. The tab terminals 9 projecting downward from the bus bars 2A, 2B are accommodated in a connector housing 10 provided on the bottom wall 6a.

On the wiring board 1, a resin waterproof plate 11 that covers the wiring board is superposed. This waterproof board 1
1 is provided with a seat portion 12 projecting upward at a position opposed to the tab terminal 5, and the seat portion has a tab terminal insertion hole 1 formed therein.
3 penetrates. The tab terminal 5 projects upward from the tab terminal insertion hole 13 in a fitted state with almost no gap. As shown in FIG. 4, the seat 12 protrudes from the waterproof plate 11 in a truncated quadrangular pyramid shape, and surrounds a lower portion of the tab terminal 5 which is inserted into the tab terminal insertion hole 13 and protrudes. The height h1 of the seat 12 is set larger than the height h2 of the water droplet G.
Therefore, the water droplets G that have entered the waterproof plate 11 are isolated from the tab terminals 5, so that the water droplets G do not accumulate between the tab terminals 5 and 5 to cause a leak current.

[0004]

However, in the conventional bus bar wiring board structure, one tab terminal 5 is provided.
Is formed with the above-described dimensions, so that it is impossible to reduce the distance between the tab terminals 5 and 5 while ensuring insulation and preventing leakage current. However, there is a problem in making the wiring board compact.

An object of the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an electric junction box capable of ensuring insulation between tab terminals and preventing leakage current, thereby achieving a compact wiring board. An object of the present invention is to provide a bus bar wiring board structure.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to laminate a plurality of bus bars formed for wiring and an insulating wiring board, and to connect a tab-shaped terminal coupled to the bus bar to the wiring board. In the bus bar wiring board structure of the electric junction box protruding from the through hole, a partition for preventing leakage formed between the adjacent bus bars of the wiring board is shared by both the bus bars, and water or the like is formed on the upper end of the partition. The problem can be solved by a bus bar wiring board structure of an electric connection box, wherein a projecting rib for cutting off a conductive path due to adhesion is provided. Further, in the bus bar wiring board structure of the electric connection box, preferably, an upper end portion of the projecting rib is formed to have an acute angle in cross section.

[0007] According to the bus bar wiring board structure of the electric junction box having the above structure, a partition for preventing leakage formed between the bus bars adjacent to the wiring board is shared by both bus bars, and water is applied to the upper end of the partition. Since the protruding ribs are provided to cut off the conductive path due to the adhesion, etc., the distance between the adjacent bus bars can be reduced to the minimum distance that can be prevented from leaking, which is close to the thickness of the partition wall for both uses. Therefore, it is possible to reduce the size of the wiring board while ensuring insulation, and it is possible to reliably cut off the conductive path leading to the leak current without causing the water droplets or the like penetrating on the partition walls to adhere to the upper end of the partition walls by the projecting ribs. it can. Therefore, it is possible to reduce the size of the wiring board while reliably preventing insulation between the tab terminals and leakage current, and to obtain a highly reliable and compact electric junction box. Further, by forming the upper end of the projecting rib into an acute angle in cross section, the conductive path at the upper end of the partition wall can be reliably cut off, and the reliability of the electric connection box can be further improved.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a bus bar wiring board structure of an electric connection box according to the present invention. FIG. 1 is a perspective view showing one embodiment of a bus bar wiring board structure of an electric connection box of the present invention, and FIG. 2 is a partially enlarged view of a main part in FIG. As shown in FIG. 1, a bus bar wiring board structure 20 of an electric junction box according to the present embodiment includes a plurality of bus bars 22A, 22B and the like formed for wiring on both front and back surfaces, and at least two wiring boards 21. , 23 are stacked. The bus bar 22A of the upper wiring board 21
Tab terminals 25A and 25B are erected from 22B.
It protrudes upward from the through hole 24 of the wiring board 21.

On the wiring board 21, partitions 26, 27 for preventing leakage between the bus bars are erected, and are formed so as to surround the lower portions of the tab terminals 25A, 25B. Among them, the partition wall 27 formed between the adjacent bus bars 22A and 22B is shared by both bus bars 22A and 22B. At the upper end of the partition wall 27, there is provided a projection rib 28 having an acute angle in cross section for cutting off a conductive path due to adhesion of water or the like.

As shown in FIG. 2, tab terminals 25A, 25B
Is substantially equal to the plate thickness T of the partition wall 27, and is set to the minimum distance that can prevent leakage. Also, the projection rib 28
Has a triangular cross section having an apex angle φ that is an acute angle (90 ° or less), and is continuously provided along the depth direction of the partition wall 27 in the figure. When the apex angle φ is 90 ° or more, the drainage is poor, and when the apex angle is too sharp, the moldability deteriorates.

The height H of the projection rib 28 is set larger than the water droplet G, and is generally preferably 0.5 mm or more. If the height H is too high, the projection rib 28
The space is not good enough, and when the thickness is less than 0.5 mm, the effect is lost.

According to the bus bar wiring board structure 20 of the electric junction box having the above-described structure, the distance W between adjacent bus bars can be set to the minimum distance which is close to the thickness T of the partition wall 27 which can be used for both sides and can prevent leakage. Therefore, it is possible to reduce the size of the wiring board 21 and, in turn, the size of the electric connection box while ensuring insulation.

The water droplets G that have entered the partition wall 27 of the wiring board 21 are divided without being attached to the upper end of the partition wall 27 by the protruding ribs 28, or are separated from one another by the tab terminals 25A.
Or, it falls on the partition 27 on the 25B side. Therefore, the conductive path leading to the leak current can be reliably cut off, and the water current G does not accumulate between the tab terminals 25A and 25B to cause a leak current.

It should be noted that the present invention is not limited to the above-described embodiment, but can be embodied in other forms by making appropriate changes. For example, the shape of the projection rib 28 is triangular in cross section, but the slope may be curved. Further, the bottom portion is set smaller than the plate thickness T of the partition wall 27, but may be equal to the plate thickness T.

[0015]

As described above, according to the bus bar wiring board structure of the electric junction box of the present invention, the partition for preventing leakage formed between adjacent bus bars of the wiring board can be shared by both bus bars. Protrusion ribs are provided at the upper end of the partition wall to cut off a conductive path due to adhesion of water or the like, so that the interval between adjacent bus bars can be made the minimum interval that can prevent leakage. Therefore, it is possible to reduce the size of the wiring board while ensuring insulation, and it is possible to reliably cut off the conductive path leading to a leak current without causing water droplets or the like penetrating on the partition to adhere to the upper end of the partition by the projecting rib. it can. Therefore, it is possible to reduce the size of the wiring board while reliably preventing the insulation properties and leakage current between the tab terminals, and to obtain a highly reliable and compact electric junction box.

Further, by forming the upper end portion of the projecting rib to have an acute angle in cross section, the conductive path at the upper end of the partition wall can be reliably cut off, and the reliability of the electric connection box can be further improved.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing one embodiment of a bus bar wiring board structure of an electric junction box of the present invention.

FIG. 2 is a partially enlarged view of a main part in FIG.

FIG. 3 is a partial cross-sectional view showing a conventional bus bar wiring board structure.

FIG. 4 is a partial perspective view showing a main part in FIG. 3;

[Explanation of symbols]

 20 Bus Bar Wiring Board Structure of Electrical Junction Box of the Present Invention 21 Wiring Board 22A, 22B Bus Bar 24 Through Hole 25A, 25B Tab Terminal 26, 27 Partition 28 Protrusion Rib

Claims (2)

[Claims] A bus bar wiring board of an electric connection box in which a plurality of bus bars formed for wiring and an insulating wiring board are laminated, and a tab-shaped terminal coupled to the bus bar projects from a through hole of the wiring board. In the structure, a partition for preventing leakage formed between the adjacent bus bars of the wiring board is also used for both the bus bars, and a projection rib for cutting off a conductive path due to adhesion of water or the like is provided at an upper end of the partition. A bus bar wiring board structure of an electric junction box, characterized by being provided. 2. The bus bar wiring board structure of an electric junction box according to claim 1, wherein an upper end of said projecting rib is formed to have an acute angle in cross section.