JPH10126920A - Electrical junction box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the deformation of an electrical junction box and enable the stable electrical connection by a method wherein bearing surfaces are provided on one of a board housing unit and a wiring board at positions corresponding to the positions of a bracket to which an external force is applied so as to be pressed against the other and, when the external force is applied to the bracket in a direction toward the inside of the box, the bearing surfaces are pressed against the wiring board or the board housing. SOLUTION: Bearing surfaces 20 which are pressed against a wiring board 5 are provided on a board housing unit 2 at positions corresponding to the positions of the bracket 6 of an electrical junction box 1 to which an external force is applied. The bearing surfaces 20 comprises two protruding strips and are formed integrally on the bottom 2b of the board housing unit 2 with heights approximately the same as the spacing between the bottom 2b and the wiring board 5 so as not to interfere wires 4 on the wiring board 5. With this constitution, even if the external force F1 is applied to the flange part 6a of the bracket 6 of the electrical junction box 1 in a direction toward the inside of the box, the force is distributed by the bearing surfaces 20 before it is transmitted to the wiring board 5, so that the deformation of the box can be suppressed and hence the deformation of the wiring board 5 can be avoided and the stable electrical connection can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric junction box having an electronic board housed therein, which is used, for example, by fixing it to a dash panel of an automobile. Here, the electric connection box is a fuse box, a relay box, a connector box, or the like, which is provided with connectors and terminals for connecting with various external loads, switches, connectors, and other electrical components. Used to simplify and lighten the electrical wiring.

[0002]

2. Description of the Related Art FIG. 5 and FIG.
Is shown.

In the electric connection box 100, an electronic board 3 is mounted on the outer surface of the board storage unit 2, and a wiring board 5 on which electric wires 4 are routed is installed facing the inner surface. It is configured by providing a bracket 6 protruding outward at the peripheral edge. The board storage part 2 is formed by recessing the upper surface part 10 of the electric connection box 100 into a concave shape.
Are fixed to the steps 2a formed at the four corners with screws 7 so as to close the openings of the substrate storage section 2.
The electric wires 4 are fixed to and fixed to a metal fitting 8 fixed on the wiring board 5. Further, the bracket 6 is for mounting the electric connection box 100 to an external structure such as a vehicle, and has a flange portion 6a at a tip thereof which is inclined so as to correspond to a mounting portion of the external structure. The flange portion 6 has a mounting hole 6b.

As described above, in the electric junction box 100 incorporating the electronic board 3, the electric wires 4 are routed by using the storage area of the electronic board 3, that is, the installation area of the board storage section 2. It is designed to increase the wiring density of the connection box 100.

[0005] In FIG.
Electrical connection box 100 so as to cover electronic board 3 fixed to
Reference numeral 11 denotes a connection terminal provided on the electronic board 3.

[0006]

[SUMMARY OF THE INVENTION] However, in the conventional electric connection box 100, when the external force F ₁ of Hakonai direction on the flange portion 6a of the bracket 6 as shown in FIG. 7 acts, the base end portion of the bracket 6 work action force F ₂ on the bottom 2b of the substrate housing portion 2 to be connected, showing the peripheral portion of the substrate housing portion 2 which is formed of a substrate housing portion 2 and the bracket 6 by the action force F ₂ is a two-dot chain line in FIG. There is a risk of deformation. When such a deformation occurs, the electronic substrate 3 firmly fixed to the substrate housing portion 2 with the screws 7 is similarly deformed (indicated by a two-dot chain line in FIG. 7). Stress is applied to the solder part 12 and the connection part 13 (see FIG. 8) between the electric connection box 100 and the electronic board 3, resulting in solder cracks and poor connection of the terminals 11.

As described above, the conventional electric connection box has a problem that the electric connection becomes unstable due to the deformation of the box.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide an electric connection box which suppresses box deformation and enables stable electric connection.

[0009]

In order to achieve the above object, according to the present invention, an electronic board is mounted on an outer surface of a substrate housing portion, and a wiring board on which electric wires are routed against the inner surface is provided. An electrical junction box which is installed and integrally formed with a bracket protruding outward at a peripheral portion of the board housing portion, wherein any one of the board housing portion and the wiring board corresponding to a portion where an external force input to the bracket is applied. It is characterized in that one of the contact surfaces is provided with an abutment surface that contacts the other.

Therefore, according to the first aspect of the present invention, when an external force in the box direction acts on the bracket, a contact surface formed on one of the substrate housing portion and the wiring board abuts on the other, and the external force is reduced. Can be dispersed and transmitted to the wiring board to be absorbed, so that box deformation can be suppressed, whereby deformation of the electronic substrate can be prevented.

According to a second aspect of the present invention, there is provided the electric connection box according to the first aspect, wherein the contact surface is provided on one of the board storage portion and the wiring board and the board storage portion avoids the electric wire. It is characterized in that it is constituted by a projecting portion integrally formed with a height substantially equal to the gap between the portion and the wiring board.

For this reason, in the invention according to the second aspect, the contact surface is constituted by the protruding portion formed so as to avoid the electric wire routed on the wiring board, so that interference with the electric wire at the time of contact of the contact surface is avoided. Can be.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show a main part of an electric junction box 1 according to an embodiment of the present invention. This electric connection box 1 is different only in that a contact surface 20 is provided on the substrate storage section 2 side, and the other configuration is the same as that of the above-described conventional electric connection box 100. Therefore, the same components are denoted by the same reference numerals, and description thereof will be omitted.

That is, the electric connection box 1 is characterized in that the contact surface 20 that comes into contact with the wiring board 5 is provided in the board housing portion 2 corresponding to the portion where the external force input to the bracket 6 acts.

The bracket 6 is formed integrally with the peripheral edge of the board storage section 2 with its base end 6c continuing to the bottom 2b of the board storage section 2. For this reason, the action portion of the external force input to the flange portion 6a at the distal end of the bracket 6 is the bottom portion 2b of the substrate storage portion 2 where the base end portion 6c is continuous.
The contact surface 20 is formed on the inner surface side of the bottom 2b.

In the present embodiment, the contact surface 20 has a projection height on the inner surface of the bottom 2b, which is substantially equal to the gap between the bottom 2b and the wiring board 5, avoiding the electric wires 4 routed on the wiring board 5. It is composed of a ridge (projection) integrally formed and protruding.

[0018] Thus, according to the electrical junction box 1 constructed and Hakonai direction of the external force F ₁ acts on the flange portion 6a of the bracket 6 as shown in FIG. 4, through the proximal end portion 6c of the bracket 6 The acting force F ₂ acts on the bottom 2 b of the substrate housing portion 2, and the contact surface 20 comes into contact with the wiring board 5 by the acting force F ₂ .

Due to the contact of the contact surface 20, the acting force F ₂
Are dispersed and transmitted to the wiring board 5 to be absorbed, so that the box deformation can be suppressed, whereby the deformation of the electric board 3 can also be prevented.

For this reason, the electrical connection device 1 can prevent solder cracks in the board solder portion and connection failures in the board terminal portion due to deformation of the electronic board 3 beforehand, and achieve stable electrical connection. it can.

Further, since the contact surface 20 of the electric junction box 1 is formed by a ridge formed so as to avoid the electric wires 4 on the wiring board 5, the electric wires 4 are contacted when the contact surface 20 contacts the wiring board 5. Interference can be avoided, thereby preventing damage to the electric wire 4 and achieving more stable electrical connection.

The present invention is not limited to the above-described embodiment, but includes the following modifications.

That is, the contact surface 20 may be provided on the wiring board 5. In this case, when an external force F ₁ acts on the bracket 6, the inner side surface of the bottom 2 b of the substrate housing portion 2 comes into contact with the contact surface 20. Box deformation can be suppressed.

In addition, the contact surface 20 may be formed not by a series of protrusions but by protrusions (protrusions) intermittently provided at appropriate intervals.

[0025]

As described above, according to the present invention, the following effects can be obtained. In other words, according to the first aspect of the present invention, even if an external force in the box direction acts on the bracket, the contact surface comes into contact with the bracket to prevent deformation of the electronic board due to box deformation, and solder cracking of the board solder portion. In addition, it is possible to prevent the connection failure of the circuit board terminal portion from occurring, and to provide an electric connection box that enables stable electric connection.

According to the second aspect of the present invention, when the abutment surface is in contact, it is possible to avoid interference with the electric wires routed on the wiring board, thereby preventing damage to the electric wires and further stabilizing the electric wires. Electrical connection can be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of an electric junction box as one embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a partially cutaway view of FIG.

FIG. 4 is an operation explanatory view corresponding to FIG. 2 of the electric connection box of FIG. 1;

FIG. 5 is an exploded perspective view of a conventional electric junction box.

FIG. 6 is a longitudinal sectional view of the electric junction box of FIG. 5 in a state where components other than a top cover are assembled.

FIG. 7 is an operation explanatory view corresponding to FIG. 6 of the electric connection box of FIG. 5;

8 is a cross-sectional view of a terminal forming portion of an electronic board of the electric connection box of FIG.

[Explanation of symbols]

6 bracket 1 electric connection box 2 substrate housing portion 3 electronic substrate 4 wire 5 wiring board 20 contact surface F ₁ external force

Claims (2)

[Claims] 1. A bracket for mounting an electronic substrate on an outer surface of a substrate storage portion, installing a wiring board on which electric wires are routed against the inner surface, and projecting outward on a peripheral edge portion of the substrate storage portion. An electric connection box integrally formed with: an electric contact box provided with an abutting surface that abuts on one of the board storage portion and the wiring board corresponding to a portion to which an external force input to the bracket is applied; Connection box. 2. The electrical junction box according to claim 1, wherein the contact surface is provided on one of the board storage portion and the wiring board, and the gap between the board storage portion and the wiring board is arranged to avoid the electric wire. An electrical junction box, comprising a protruding portion having a height substantially equal to that of and integrally formed.