JPH0567131U - Electrical junction box - Google Patents

Abstract

(57) [Summary] [Construction] In an electrical junction box, wherein a circuit board 3 composed of an insulating plate 1 and a bus bar 2 arranged on the insulating plate 1 is housed in a case, the insulating plate 1 A bus bar cover plate 7 covers at least the side edge of one of the bus bars 2 arranged close to each other on the side closer to the other bus bar 2. [Effect] The creepage distance between the approaching busbars is increased by the amount covered by the busbar cover plate, so that a leak current is less likely to flow between the busbars, and a short circuit between the busbars is less likely to occur even when water enters. Furthermore, since the distance between adjacent bus bars can be reduced, the electric junction box can be downsized.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electric junction box used for wiring in a car.

[0002]

[Prior art]

 An electric connection box of an automobile has a structure in which a circuit board 3 including an insulating plate 1 and a bus bar 2 arranged on the insulating plate 1 is housed in a case 4, as shown in FIG. As shown in FIG. 8, the circuit board 3 has a structure in which the insulating plate 1 is provided with the bus bar housing groove 5, and the bus bar 2 is arranged in the bus bar housing groove 5. A plurality of layers or a plurality of layers are stacked, an uppermost layer is covered with an insulating plate (not shown) (the insulating plate may not be covered in some cases), and the case 4 is stored.

[0003]

[Problems to be solved by the device]

 However, in the electrical junction box configured as described above, the following problems have occurred with the increase in the number of automobile electrical components in recent years. In other words, the electrical junction box is required to be small in size due to the space of the installation site, and if the number of electrical components for automobiles increases in response to such requirements, the number of busbars will increase and the distance between adjacent busbars will increase. Get smaller.

When the distance between adjacent bus bars becomes smaller, the creeping distance S between the bus bars 2 becomes shorter as shown in FIG. For this reason, there is a problem that a leak current easily flows between the bus bars, and a short circuit easily occurs between the bus bars if water enters the electrical junction box. For this reason, there is a limit in reducing the distance between adjacent bus bars, and in the end there is a limit in downsizing the electrical junction box.

[0005]

[The purpose of the device]

 In view of the above problems, the present invention provides an electrical junction box in which a leak current is less likely to flow between busbars, a short circuit between busbars is less likely to occur even when water enters, and the overall size can be reduced.

[0006]

[Means for Solving the Problems]

 In order to achieve this object, the present invention provides an electrical connection box in which a circuit board including an insulating plate and a plurality of bus bars arranged on the insulating plate is housed in a case. It is characterized in that one of the bus bars arranged close to each other on the plate is covered with a bus bar cover plate at least on the side edge on the side closer to the other bus bar.

[0007]

[Action]

 In this way, by covering at least the side edge of one of the closely arranged bus bars on the side approaching the other bus bar with the bus bar cover plate, the creeping distance between the approaching bus bars becomes longer by the amount covered by the bus bar cover plate. Become. Therefore, a leak current is less likely to flow between the bus bars, and a short circuit between the bus bars is less likely to occur even when water enters. Further, since the creeping distance between the approaching bus bars becomes longer, the distance between the adjacent bus bars can be made smaller than before. Therefore, the electric junction box can be downsized.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1A and 1B show an insulating plate used in an embodiment of the present invention. FIG. 1A is a perspective view, and FIG. 1B is a sectional view taken along the line AA of FIG. This insulating plate 1 is the same as the conventional one in that the bus bar housing grooves 5 are provided close to each other, but the insulating plate 1 is provided at one side edge of the bus bar housing grooves 5 provided close to each other in the longitudinal direction. A bus bar cover plate 7 is provided so as to project along the bus bar cover plate 7.

To attach the bus bar to the insulating plate 1, the bus bar 2 is arranged in the bus bar housing groove 5 as shown in FIG. 2 (a), and then the base of the bus bar cover plate 7 is shown as shown in (b). Is bent so as to cover the bus bar 2 and the side edge 8 of the bus bar cover plate 7 and the insulating plate 1 are heat-fused to integrate the bus bar cover plate 7 with the insulating plate 1. As a result, the circuit board 3 is obtained in which one bus bar 2 is covered with the bus bar cover plate 7 and the other bus bar 2 is simply housed in the bus bar housing groove 5. As in the conventional case, one or more layers of such circuit boards 3 are stacked and housed in a case to form an electrical junction box.

As described above, among the bus bars 2 arranged close to each other, when the side edge of one bus bar 2 closer to the other bus bar 2 is covered with the bus bar cover plate 7, the creepage distance S between the bus bars 2 is reduced. (See FIG. 2B) is longer than the conventional one by the width of the bus bar cover plate 7.

Therefore, it is difficult for a leak current to flow between the adjacent and adjacent bus bars, and a short circuit between the bus bars is less likely to occur even when water enters. Furthermore, since the distance between the bus bars can be made smaller than before, the electric junction box can be downsized.

FIGS. 3A and 3B show a second embodiment of the present invention. The difference from the above-mentioned embodiment is that, as shown in (a), of the bus bar storage grooves 5 formed close to each other, a bus bar cover plate 7 is projectingly provided on both sides of one of the bus bar storage grooves 5. It is bent as shown in (b) and the side edges 8 of both busbar cover plates 7 are heat-sealed together on the busbar 2.

FIGS. 4A and 4B show a third embodiment of the present invention. This is different from the embodiment of FIG. 3 in that the width of the busbar cover plate 7 projecting on both sides of the one busbar storage groove 5 is made smaller, and only the side edges of the one busbar 2 are covered by the busbar cover plate 7. It is covered. Even with such a configuration, the creepage distance between the busbars becomes long, so that a leak current does not easily flow between the busbars, a short circuit between the busbars does not easily occur due to the intrusion of water, and the electrical junction box is further downsized. It becomes possible.

FIGS. 5A and 5B show a fourth embodiment of the present invention. The difference from each of the above-mentioned embodiments is that the bus bar 2 is arranged on the insulating plate 1 without providing the bus bar housing groove in the insulating plate 1, and the bus bar 2 is provided with a bus bar cover plate 7 protruding from the insulating plate 1. It is covered with.

The bus bar cover plate 7 covers one side surface and an upper surface of the one bus bar 2, and the other side surface 9 of the bus bar 2 is not covered. This is because there is no other bus bar close to the other side 9 side of the bus bar 2, and if another bus bar is also close to the other side 9 side of the bus bar 2, In addition, the bus bar cover plate 7 is provided so as to cover the side surface 9 side as well. The other bus bar 2 which is not covered with the bus bar cover plate 7 is fixed to the insulating plate 1 by an appropriate means such as adhesion.

FIGS. 6A and 6B show a fifth embodiment of the present invention. 5 is different from the embodiment of FIG. 5 in that three bus bars 2 are arranged close to each other, and a bus bar cover plate 7 is projectingly provided on both sides of the center bus bar 2 and the bus bar cover plate 7 is placed at the center. The point is that they are bent on the bus bar 2 and their side edges 8 are heat-sealed to each other.

In the above embodiment, the busbar cover plate is provided so as to project from the insulating plate, and the busbar cover plate and the insulating plate are integrally formed. However, the busbar cover plate is a separate member from the insulating plate. Good. Further, the bus bar cover plate does not have to be provided on one of the adjacent bus bars, but may be provided only on a portion where the distance between the bus bars is small and leakage current becomes a problem. Further, the means for integrating the bus bar cover plate with the insulating plate may be not only heat fusion but also adhesion or the like. Further, both of the bus bars arranged closer to each other may be covered with the bus bar cover plate.

[0018]

[Effect of the device]

 As described above, according to the present invention, since at least one side edge of one bus bar closely arranged on the insulating plate is covered by the bus bar cover plate, the creeping distance between the approaching bus bars is reduced. It becomes longer as much as it is covered with the busbar cover plate. Therefore, it is difficult for leak current to flow between the busbars, and short-circuiting between the busbars is unlikely to occur even if water enters. Further, the creepage distance between the approaching busbars is increased by the amount covered by the busbar cover plate, so that the distance between the busbars can be made smaller than before. Therefore, the electric junction box can be downsized.

[Brief description of drawings]

1A and 1B show an insulating plate used in an embodiment of the present invention, in which FIG. 1A is a perspective view and FIG. 1B is a sectional view taken along line AA of FIG.

FIG. 2 shows an embodiment of the present invention, in which (a) is a cross-sectional view before the busbar cover plate is bent, and (b) is a cross-sectional view after the busbar cover plate is bent.

FIG. 3 shows another embodiment of the present invention, in which (a) is a sectional view before the busbar cover plate is bent, and (b) is a sectional view after the busbar cover plate is bent.

FIG. 4 shows another embodiment of the present invention,
(A) is a cross-sectional view before bending the busbar cover plate,
(B) is a cross-sectional view after bending the bus bar cover plate.

5 shows another embodiment of the present invention, FIG.
(A) is a cross-sectional view before bending the busbar cover plate,
(B) is a cross-sectional view after bending the bus bar cover plate.

FIG. 6 shows another embodiment of the present invention,
(A) is a cross-sectional view before bending the busbar cover plate,
(B) is a cross-sectional view after bending the bus bar cover plate.

FIG. 7 is an exploded perspective view of a conventional electric junction box.

FIG. 8 is a sectional view of a circuit board in a conventional electrical junction box.

[Explanation of symbols]

 1: Insulation plate 2: Bus bar 3: Circuit board 5: Bus bar housing groove 7: Bus bar cover plate

Claims (1)

[Scope of utility model registration request] 1. An electric junction box in which a circuit board including an insulating plate and a bus bar arranged on the insulating plate is housed in a case, and the circuit board is arranged close to each other on the insulating plate. An electric junction box characterized in that at least one side edge of one bus bar which is close to the other bus bar is covered with a bus bar cover plate.