JPH11330739A - Fixing structure of circuit board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make feasible of fixing a circuit board in the whole direction as well as improving the assembling workability. SOLUTION: In a fixing structure of circuit board, a pair of large and small upper cover 10 and lower cover 20 are provided, while notches 11a, 11a and 21a, 21a are respectively formed on the edges of opposite two sidewalls 11, 11 and 21, 21 as well as rib parts 31a, 31a fitted to the notches 11a, 11a and 21a, 21a are respectively protruded on the two sides 31, 31 opposite to a circuit board 30 housed in these upper cover 10 and the lower cover 20 so that, when the circuit board 30 is housed in these upper cover 10 and the lower cover 20, the ribs 31a, 31a fixed to the notches 11a, 11a and 21a, 21a may be held between these upper cover 10 and the lower cover 20 in such a constitution as described above.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing structure of a circuit board housed in, for example, an upper cover and a lower cover, and more particularly, to a circuit board which can be fixed in all directions, and an assembling workability is improved. Can also be
The present invention relates to a circuit board fixing structure capable of simplifying the configuration and reducing the weight by reducing the number of components.

[0002]

2. Description of the Related Art In fixing a circuit board housed in an upper cover and a lower cover, generally, as shown in FIG. 3, four corners of a circuit board 130 are screwed to an upper cover 110 (or a lower cover 120). (Eg, Japanese Utility Model Laid-Open No. 49-84654).

In Japanese Utility Model Laid-Open No. 3-65288, FIG.
As shown in FIG.
A fixed structure is proposed in which the lower cover 120 is provided with a pair of elastic protrusions 121, 121, and the support board 111 and the elastic protrusions 121 sandwich the circuit board 130 in the assembled upper cover 110 and lower cover 120. Have been.

[0004]

However, in the fixing structure shown in FIG. 3, in which the four corners of the circuit board 130 are screwed to the upper cover 110, four screws 140 are used. There is a problem that it takes time and effort to remove, and there is also a problem that the screw 140 increases the weight of the entire apparatus.

On the other hand, in the fixing structure shown in FIG. 4 in which the circuit board 130 is sandwiched between the columns 111 and the elastic projections 121, the circuit board 130 can be fixed in the vertical direction, but the fixing in the horizontal direction is insufficient, and When the circuit board 130 is received, there is a problem that the circuit board 130 is shifted in the horizontal direction and falls off. Therefore, such a circuit board fixing structure cannot be applied to an electric junction box which receives a large vibration when the vehicle travels.

Further, at the time of assembling, it is difficult to position the circuit board 130 between the support pillar 111 and the elastic projection 121, and there has been a problem that the assembling workability is poor.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and can fix a circuit board in all directions, improve assembling workability, and
An object of the present invention is to provide a circuit board fixing structure capable of simplifying the configuration and reducing the weight by reducing the number of parts.

[0008]

In order to achieve the above object, a circuit board fixing structure according to the present invention comprises a pair of large and small upper covers and a lower cover whose side walls overlap with each other outside and inside. Notches are respectively formed at edges of two opposing side walls of the cover and the lower cover, and ribs that fit into the notches are formed at two opposing sides of a circuit board housed in the upper cover and the lower cover. When the circuit board is stored in the upper cover and the lower cover, the ribs fitted in the cutouts are sandwiched between the upper cover and the lower cover.

According to such a configuration, the ribs provided on the circuit board are fitted into the cutouts formed in the upper cover and the lower cover, so that the ribs are held vertically and horizontally and the circuit board is vertically held. It can be fixed in all directions, directional and lateral.

Further, since the ribs of the circuit board are fitted into the cutouts of the upper cover and the lower cover, the circuit board can be easily positioned with respect to the upper cover and the lower cover. Can be improved.

Further, screws, columns and elastic projections, unlike the conventional fixing structure, are not required, and the structure can be simplified. In addition, the weight of the entire apparatus can be reduced by eliminating the screws from the configuration.

Preferably, in the above-mentioned structure for fixing a circuit board of the present invention, a projection and a recess engage with each other when the notch and the rib are fitted on both sides of the notch and the rib. Is provided.

In the case of such a configuration, the ribs can be firmly connected to the respective notches by the engagement of the convex portions and the concave portions, and the circuit board is more securely fixed to the upper cover and the lower cover. be able to.

Preferably, in the fixing structure for a circuit board of the present invention, when the notch and the rib are fitted together, the circuit is formed on two side walls of the upper cover or the lower cover where the notch is formed. The two sides of the substrate, on which the ribs protrude, are in contact with each other.

With this configuration, it is possible to prevent rattling of the circuit board ribs in the protruding direction in the upper cover and the lower cover, and the circuit board is more securely fixed to the upper cover and the lower cover. can do.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a circuit board fixing structure according to the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view of an electric connection box in which a circuit board fixing structure according to an embodiment of the present invention is implemented. FIG. 2 is a sectional view of the electric junction box, and FIG.
FIG. 2B shows a state after the assembly.

In FIGS. 1 and 2A, reference numeral 1 denotes an electric junction box, which includes a pair of large and small upper covers 10 and a lower cover 20 whose side walls overlap with each other outside and inside. The circuit board 30 is housed in the circuit board 20.

The circuit board 30 is formed with circuits for connecting the wiring harnesses with various electric components and wiring patterns, but is a part unrelated to the circuit board fixing structure according to the present invention. Therefore, the illustration is omitted.

At the edges of the two opposing side walls 11, 11 of the upper cover 10, rectangular cutouts 11a, 11a each having a thickness equal to the thickness of the circuit board 30 are formed. Further, a pair of convex portions 11b, 11b facing each other are projected from both side walls of each cutout portion 11a.

Similarly, rectangular notches 21a, 21a each having a thickness equal to the thickness of the circuit board 30 are formed at the edges of the two opposing side walls 21, 21 of the lower cover 20, respectively. A pair of convex portions 21b, 21b facing each other are provided on both side walls of the portion 21a so as to protrude.

The upper cover 10 and the lower cover 20
Opposing sides 31 of the circuit board 30 housed in the housing
Are provided with ribs 31a, which fit into the respective notches 11a, 21a.
31a are protruded respectively. Also, on both side walls of each rib 31a, the projections 11b, 2 of the notches 11a, 21a are provided.
Recesses 31b, 31b engaging with 1b are provided respectively.

Here, the inner shape of the upper cover 10 matches the outer shape of the lower cover 20, and as described above, the side walls of the upper cover 10 overlap with each other outside and inside, and are fitted. The inner shape of the lower cover 20 is made to match the outer edge of the circuit board 30.

In the circuit board fixing structure of the present embodiment having the above configuration, as shown in FIG. 2B, when the circuit board 30 is stored in the upper cover 10 and the lower cover 20, each of the cutouts 11a and 21a has The ribs 31a are fitted, and these ribs 31a are sandwiched between the upper cover 10 and the lower cover 20.

The upper cover 10 and the lower cover 20
The ribs 3 of the circuit board 30 are provided in the respective notches 11a and 21a.
As soon as 1a is fitted, the projections 11b, 21b of the cutouts 11a, 21a are replaced by the recesses 31b, 31 of each rib 31a.
b.

Further, each notch 21a of the lower cover 20
When the respective ribs 31a of the circuit board 30 are fitted to the two sides, the two sides 31, 31 of the circuit board 30 abut on the two side walls 21, 21 of the lower cover 20.

According to the circuit board fixing structure of the present embodiment having such a configuration, the ribs 31a provided on the circuit board 30 are fitted into the cutouts 11a and 21a formed on the upper cover 10 and the lower cover 20, respectively. By combining, the ribs 31a are sandwiched vertically and horizontally, and the circuit board 30 can be fixed in all the vertical and horizontal directions.

The upper cover 10 and the lower cover 20
The ribs 3 of the circuit board 30 are provided in the respective notches 11a and 21a.
1a, the upper cover 1
The circuit board 30 can be easily positioned relative to the lower cover 20 and the lower cover 20, and the efficiency of assembly work can be improved.

Furthermore, screws, columns, and elastic projections, unlike the conventional fixing structure, are not required, and the configuration can be simplified. In addition, the weight of the entire apparatus can be reduced by eliminating the screws from the configuration.

The notches 11a and 21a and the ribs 3
The ribs 31a can be firmly coupled to the notches 11a, 21a by the engagement of the convex portions 11b, 21b and the concave portion 31b provided on the first cover 1a. Can be fixed.

Further, the two side walls 2 of the lower cover 20
Since the two sides 31 and 31 of the circuit board 30 are in contact with the upper cover 10 and the lower cover 2, respectively.
Within 0, rattling of the circuit board 30 in the projecting direction of the rib 31a can be prevented, and the circuit board 30 can be more securely fixed to the upper cover 10 and the lower cover 20.

The circuit board fixing structure of the present invention is not limited to the above-described embodiment. For example, the circuit board fixing structure of the present invention is not limited to the electric connection box, and can be applied to various devices that accommodate the circuit board in the upper cover and the lower cover.

The upper cover 10 and the lower cover 20
Notches 11a, 21a and ribs 3 of the circuit board 30
1a is not limited to a configuration in which one set is provided as in the above-described embodiment, and a plurality of notches 11a, 21a and a rib 31a may be provided in each.

Further, the convex portions 11b and 21b and the concave portion 31b
Is notch 11a, if there is a correspondence between convex and concave
Any combination may be provided on both side walls of the rib 21a and both side walls of the rib 31a.

[0034]

As described above, according to the circuit board fixing structure of the present invention, the circuit board can be fixed in all directions, the workability of assembly can be improved, and the number of parts can be further reduced. The configuration can be simplified and the weight can be reduced by reducing the number of the components.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an electric junction box in which a circuit board fixing structure according to an embodiment of the present invention is implemented.

FIGS. 2A and 2B are cross-sectional views of the electric junction box, wherein FIG. 2A shows a state before assembling and FIG. 2B shows a state after assembling.

FIG. 3 is a plan view showing a conventional circuit board fixing structure.

FIG. 4 is a cross-sectional view showing another conventional circuit board fixing structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric connection box 10 Upper cover 20 Lower cover 11a, 21a Notch 11b, 21b Convex part 30 Circuit board 31a Rib 31b Concave part

Claims (3)

[Claims] 1. A pair of large and small upper covers and a lower cover whose side walls overlap with each other outside and inside, and a notch is formed in each of two opposing side walls and edges of the upper cover and the lower cover. At the opposite two sides of the circuit board housed in the upper cover and the lower cover, ribs that fit into the cutouts are respectively protruded, and when the circuit board is housed in the upper cover and the lower cover, The circuit board fixing structure, wherein the rib fitted to the notch is held between the upper cover and the lower cover. 2. The fixing of the circuit board according to claim 1, wherein a convex portion and a concave portion which engage with each other when the notch and the rib are fitted are provided on both sides of each of the notch and the rib. Construction. 3. When the notch and the rib are fitted together, two sides of the circuit board on which the rib protrudes correspond to two side walls of the upper cover or the lower cover where the notch is formed. The structure for fixing a circuit board according to claim 1 or 2, wherein the circuit board is fixed.