JPH10313521A - Electric junction box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric junction box with simple assembling work and low manufacturing cost, in which a tightening bolt is fixed to the electric junction box surely. SOLUTION: In a rectangular solid-shaped electric junction box 1, a junction box(J/B) 3 is stored in a lower cover 2. The electric junction box 1 has an outer power-supply connection unit 10. A power feeding unit 4 is provided at an outer boundary wall 2A of the J/B 3, while the outer power-supply connection unit 10 has a bolt mounting part 13. A tightening bolt 12 with a rectangular head 12A is fixed by fitting the bolt head 12A into the bolt mounting part 13 while its mail screw part is put outside. The bolt mounting part 13 has a projected fitting part 15 on its inner wall for preventing the bolt head 12A from coming out. In addition, the power feeding part 4 of the J/B 3 and an outer power supply unit are connected by connecting a power wire harness with a nut through a power-supply junction plate 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electric junction box,
More specifically, the present invention relates to an electric connection box which is disposed in an engine room of an automobile and stores various electric components used for an electric circuit of the automobile.

[0002]

2. Description of the Related Art In addition to housing various electric devices such as a relay box and a fusible link box used in an electric circuit for an automobile, an electric junction box is provided inside the automobile as a connection branch point for wiring such as a wire harness. is set up.

[0003] The electric junction box is formed in a rectangular parallelepiped shape from synthetic resin by injection molding. An external power supply connection portion is provided at a lower portion of one of the peripheral walls of the electric connection box. In order to supply electric power to the inside of the electric connection box, an internal power use circuit and a power supply device installed outside ( (Hereinafter, referred to as an external power supply) via an external power supply connection unit.
That is, the external power supply connection portion is a relay point of connection between the power use circuit in the electric connection box and the external power supply device.

A fixing bolt for connecting a wire harness extending from the external power supply is fixed to the external power supply connection portion with the male screw portion facing the outside of the electric connection box. A round terminal is connected to the male screw portion as a terminal at the end of the wire harness using a nut.

[0005]

Conventionally, there are mainly the following three types of configurations for fixing the fixing bolts of the wire harness to the electric connection box.

(1) Insert the fixing bolts into the electrical junction box in advance. (2) In the electrical junction box, form a cut-out part according to the hexagonal head of the fixing bolt, and assemble the head of the bolt.

(3) Bolts having threaded portions at both ends are inserted into holes formed in the peripheral wall of the electric connection box, and are fixed using two nuts from inside and outside of the peripheral wall. However, the conventional configurations (1) to (3) have the following problems.

In the case of (1), there is a problem that the number of steps in the insert molding stage is increased and the manufacturing cost is increased. Also,
There were problems such as the need for precision control and quality control when temporarily placing the fixing bolts for insert molding in the mold of the injection molding machine.

In the case of (2), there is a problem that the holding force of the bolt on the head is weak. This is because each corner of the hexagonal head forms an obtuse angle. In the case of (3), there are problems such as an increase in man-hours and an increase in manufacturing costs due to an increase in the number of parts.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to make it possible to securely fix a fixing bolt to an electric junction box, to simplify the assembling work, and to improve the assembling work. An object of the present invention is to provide an electric junction box capable of reducing manufacturing costs.

[0011]

According to a first aspect of the present invention, a bolt is fixed to a part of a peripheral wall, and the inside and outside of the peripheral wall are electrically connected by a wire harness connected to the bolt. In the connection box, the gist is that the head of the bolt is formed in a quadrangular shape, and an accommodating portion similar in shape to the head of the bolt is formed in the peripheral wall, and the head of the bolt is accommodated in the accommodating portion. .

According to a second aspect of the present invention, in the electrical junction box according to the first aspect, the housing portion has an upper portion released for introducing a head portion of the bolt, and is housed inside the housing portion. The gist of the present invention is to form a projection which engages with the head of the bolt to prevent the head from being pulled out.

According to a third aspect of the present invention, in the electrical connection box according to the first or second aspect, one end of the plate is fixed to a screw portion of the bolt with a nut, and the other end of the plate is formed of the same wall. The gist is that the wire harness inside the box is connected to the other end and the wire harness outside the box is connected to the threaded portion with a nut.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of an electric junction box 1 according to the present embodiment. FIG. 2 is a sectional view taken along line AA in FIG. The lower cover 2 of the electric junction box 1 is formed in a rectangular parallelepiped shape having an upper surface opened by synthetic resin by injection molding.
The upper cover for closing the upper opening of the lower cover 2 is not shown.

The lower cover 2 houses a junction box (hereinafter, referred to as J / B3). FIG.
2 shows a state in which the J / B 3 is taken out of the lower cover 2 for easy viewing.

On one peripheral wall 2A of J / B3, J / B3
Power supply unit 4 for supplying power to a power use circuit in the power supply
Is provided. Round terminals 5A are crimped to both ends of the wire harness 5 for J / B power supply, and one end is terminal-coupled to the power supply unit 4 by bolts 6,
The other end is terminally connected to a conductive plate 7 composed of a bus bar using bolts 8 and nuts 9.

On one peripheral wall 2A of the lower cover 2, an external power supply connecting portion 10 which is depressed inside the lower cover 2 is formed. In other words, the external power supply connection part 10 is protruded inside the lower cover 2.

The upper portion 10A of the external power supply connection portion 10 is open, so that the inside of the lower cover 2, that is, the electric connection box 1 is opened.
Communicates with the interior of the The external power supply connection portion 10 has fixing bolts 12 of an external power supply wire harness 11 for supplying power to the J / B 3 from an external power supply device (not shown).
However, it is fixed with the external thread facing the outside of the electric connection box.

FIG. 3 shows the mounting structure of the fixing bolts 12 and the related structure. In addition, in order to make it easy to see, from the external power supply connection part 10 to the attachment part 1 of the fixing bolt 12
3 is cut out and shown.

The mounting portion 13 of the fixing bolt 12 is a rectangular parallelepiped box with an open upper part, and has a rectangular room inside. The mounting portion 13 is provided with the lower cover 2.
And are formed integrally.

An outer wall 13A of the mounting portion 13 of the fixing bolt 12 is a back wall of the external power supply connecting portion 10,
A has a U-shaped notch 13B. A locking projection 15 is formed on the inner wall 14 facing the outer wall 13A.

The head 12A of the fixing bolt 12 has a rectangular shape substantially similar to the inside of the mounting portion 13, and
When A is inserted through the upper opening of the mounting portion 13, the head 12 </ b> A is guided into the mounting portion 13 while sliding on the slope of the locking projection 15, and is locked by the locking projection 15.

At the base of the male screw portion 12B of the fixing bolt 12, a holding portion 12 having the same diameter as the width of the U-shaped notch 13B is provided.
C is formed and fitted into the notch 13B. Since the head 12A is locked by the locking projection 15, the head 12A does not protrude from the upper opening of the mounting portion 13 of the fixing bolt 12.

The distance from the inner bottom surface 14A of the mounting portion 13 of the fixing bolt 12 to the lower surface 15A of the locking projection is equal to the distance a between the sides of the head 12A.
There is no backlash between A and the locking projection 15. Further, since the internal space 16 of the mounting portion 13 of the fixing bolt 12 is formed substantially corresponding to the size of the head 12A,
Head 12A and inner wall of mounting part (14, 14A, 14B)
There is no play between them.

FIG. 4 is an assembled exploded view of the external power supply connection portion 10. FIG. 5 shows an assembly diagram of the external power supply connection unit 10. The conductive plate 7 is formed to be bent in a plane L shape. A through hole 7B is formed in one surface 7A, and a round terminal 5A of the J / B power supply wire harness 5 is connected and fixed to the surface 7A by bolts 8 and nuts 9. The other surface 7C is formed longer than the surface 7A, and has an inverted U-shaped notch 7D corresponding to the diameter of the fixing bolt 12.

The surface 7A of the conductive plate 7 to which the wire harness 5 for J / B power supply is connected is connected to the external power supply connection portion 10 projecting into the lower cover 2 from the upper opening (not shown) of the external power supply connection portion 10. It is inserted into the power supply connection part 10. Then, the uppermost portion of the notch 7D of the conductive plate 7 is locked by the fixing bolt 12, and at that position, the fixing bolt 12
And the nut 17.

A round terminal 11 A crimped to the tip of the external power supply wire harness 11 is inserted into the fixing bolt 12, and is terminal-joined with the conductive plate 7 using a nut 17. That is, the conductive plate 7 and the external power wire harness 11 are fastened together by the nut 17.

As described above, the external power supply and the J / B 3 are connected to the power supply wire harness 1 via the conductive plate 7.
1 connected. Therefore, according to the present embodiment, since the bolt mounting portion 13 is formed integrally with the lower cover 2 using injection molding, the number of steps and the manufacturing cost can be reduced as compared with the case where the fixing bolt is insert-molded. As well as reducing the need for quality control and quality control. Then, circuits can be easily connected in the electric connection box 1.

Further, in the electric junction box 1 of the present embodiment, since the fixing bolts 12 are not hexagonal bolts but rectangular square bolts, the holding power of the bolt heads is strong. Further, since the fixing bolt 12 is fixed by being fitted to the bolt mounting portion 13, an extra nut is not required, so that the number of steps and the number of parts can be reduced. Since the locking projection 15 is formed on the bolt mounting portion 13, no component is required to prevent the fixing bolt from coming off.

The embodiments described above may be modified as follows, and the same operation and effect can be obtained in such a case. (1) A plurality of locking projections 15 are formed on the inner wall of the bolt attachment portion.

(2) The locking projection 15 is formed in a substantially square cross section. (3) The fixing bolt 12 is replaced with a bolt from which the holding portion 12C has been deleted. Although the embodiments have been described above, technical ideas other than the claims that can be grasped from the embodiments will be described below along with their effects.

4. An electric device according to claim 1, wherein a recess is formed in a part of the peripheral wall, and an accommodating portion is disposed in the interior of the recess, so that a screw portion of the bolt is located in the recess. Connection box.

In this way, the fixing bolt can be securely fixed, and the workability of assembling can be improved.

[0035]

According to the first to third aspects of the present invention, the fixing bolt can be securely fixed to the electric connection box, and the assembling work can be simplified and the manufacturing cost can be reduced. It is to provide an electrical junction box which is possible.

As described in detail above, according to the present invention, it can be provided.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of one embodiment.

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

FIG. 3A is an exploded perspective view of a bolt attachment part according to one embodiment. (B) is a view on arrow B in (a).

FIG. 4 is an exploded perspective view of an external power supply connection unit according to one embodiment.

FIG. 5 is an exemplary perspective view of an external power supply connection unit according to the embodiment;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electric connection box, 2 ... Lower cover, 2A ... Peripheral wall of lower cover, 3 ... J / B, 5 ... J / B power supply wire harness, 7 ... Conductive plate, 10 ... External power supply connection part, 11
... Wire harness for external power supply, 12 ... Bolt for fixing,
12A: head of fixing bolt, 12B: male screw part of fixing bolt, 13: bolt mounting part, 15: locking projection

Claims (3)

[Claims] 1. An electric junction box in which a bolt is fixed to a part of a peripheral wall, and a wire harness connected to the bolt electrically connects the inside and the outside of the peripheral wall. An electric junction box in which a housing portion substantially similar in shape to the head of the bolt is formed on the peripheral wall and the head of the bolt is housed in the housing. 2. The receiving portion releases an upper portion for introducing a head portion of the bolt, and engages with the head portion of the stored bolt inside the receiving portion to prevent the head portion from being pulled out. The electrical junction box according to claim 1, wherein the projection is formed. 3. One end of the plate is fixed to the threaded portion of the bolt with a nut, the other end of the plate is positioned inside the peripheral wall, and the other end is connected to a wire harness in the box. The electric connection box according to claim 1 or 2, wherein the wire harness is connected to the screw portion by a nut.