JP3409955B2 - Automotive electrical junction box with built-in electronic unit - Google Patents

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 for an automobile having a built-in electronic unit. By mounting the circuit board on which the unit is mounted, the circuit board is protected at the time of shipment and the number of parts is reduced to reduce the cost.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, an electric connection box for an automobile having a built-in electronic unit has been used in order to prevent a circuit board 4 having an electronic component 3 from being damaged at the time of shipment to an automobile manufacturer. It is housed in an electronic unit housing box 2 different from the electrical junction box 1 and shipped to an automobile manufacturer with the circuit board 4 protected. Then, in the automobile assembly line, the housing box 2 in which the electronic unit corresponding to the automobile grade is mounted is fitted and connected to the case mounting portion 1a of the electric junction box 1.

The electronic unit housing box 2 comprises a lower case 5 and an upper case 6 which are fitted and locked to each other.
A lock portion 6a formed on the outer peripheral surface of the upper case 6 and a locked portion (not shown) of the electric junction box 1 are locked and attached to the electric junction box 1. Also, the upper case 6
A through hole 6b for exposing the fitting portion 7a of the connector 7 connected to the circuit board 4 is provided on the upper surface of the above, and the connector 7 and the connector portion 1b of the electric junction box 1 are fitted and connected to each other.

[0004]

The electric junction box 1 has a problem that the number of parts is increased and the manufacturing cost is increased because the electronic unit accommodating box 2 different from the electric junction box 1 is required. . Further, at the time of shipping to an automobile manufacturer, two parts, that is, the electric junction box 1 and the electronic unit housing box 2 must be shipped, so that there is a problem that the transportation cost becomes high. Further, in the automobile assembly line, when the electrical connection box 1 is fitted and connected to the housing box 2, it is not possible to conduct a continuity test for checking whether or not the housing box 2 is securely connected. In some cases, there is a problem that it does not function properly.

The present invention has been made in view of the above problems, in which a case for accommodating an electronic unit is integrally formed with an electric connection box, and a circuit board on which the electronic unit is mounted is attached to the electric connection box during manufacturing. The purpose of this is to protect the circuit board at the time of shipping and reduce the number of parts to reduce the cost.

[0006]

In order to achieve the above object, the present invention provides a box-shaped electronic unit accommodating portion having one side surface opened from a part of an outer surface of a bottom wall of a lower case of an electric junction box. On the other hand, a circuit board on which electronic parts are mounted is inserted into the electronic unit housing portion so as to be replaceable according to the vehicle type and grade of the automobile, and a lid is detachably attached to one end of the circuit board, and the lid is used to The opening of the electronic unit accommodating portion is closed, and the lock portion provided in the lid is locked and fixed to the locked portion provided in the electronic unit accommodating portion, and the through hole is provided in the lid, and the through hole is formed in the through hole. The present invention provides an electric junction box for a vehicle, which is configured to fit a connector connected to a circuit of the circuit board and project the connector to the outside to connect to a connector of an external wire harness.

[0007]

In the electric connection box, a circuit board on which required electronic components are mounted is selected according to the type and grade of the automobile, the circuit board is attached to the lid, and then the circuit board attached to the lid is attached to the lower case. It is inserted into the electronic unit accommodating portion formed in the above. As a result, the circuit board is connected to the internal circuit of the electric junction box, and at the same time, the lock portion of the lid is locked to the locked portion, and the opening of the electronic unit accommodating portion is closed by the lid.

As described above, in the above electric connection box, the circuit board can be detachably attached to the electronic unit accommodating portion formed integrally with the lower case. Therefore, the electronic component can be shipped by shipping to the automobile manufacturer in the attached state. It is possible to protect the circuit board on which is mounted, and it is possible to reduce the number of parts by eliminating the need for an electronic unit housing box that has been conventionally required. Further, since the electronic unit can be connected at the time of assembling the electric connection box, not at the assembly line of the automobile, it is possible to conduct the continuity test of the assembled state.

Guide grooves for slidably fitting both end edges of the circuit board are provided on both inner surfaces of the electronic unit accommodating portion in a direction orthogonal to the opening, and the tip ends of the guide grooves on the opening side are tapered. Lacking. In the above electric connection box, when the circuit board attached to the lid is inserted into the electronic unit accommodating portion, the circuit board is made to correspond to the guide groove and is inserted along the guide groove, so that reliable electric connection can be achieved. it can. Further, since the tapered inclined surface is provided at the tip of the guide groove on the opening side, the insertion workability is improved.

As described above, the lid detachably attached to the circuit board is provided with the through hole, and the connector connected to the circuit of the circuit board is fitted into the through hole so as to be projected to the outside so that the external wire harness Since it is configured to be connected to the connector, the external wire harness and the circuit board can be reliably connected.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail based on the embodiments shown in the drawings. As shown in FIGS. 1 to 3, a vehicle electrical junction box 10 of the present invention includes a synthetic resin lower case 11 and an upper case 12 which are fitted to each other.
A box-shaped electronic unit accommodating portion 13 having an opening on one side is integrally provided on a part of the outer surface 11a of the bottom wall of the lower case 11.

In the electronic unit accommodating portion 13, a circuit board 1 on which electronic components 15 such as diodes and capacitors are mounted
6 is inserted into one end of the electronic unit accommodating portion 13 with the lid 17 detachably attached, and the opening 13a of the electronic unit accommodating portion 13 is inserted into the lid 1.
It is closed by 7 and shipped in this state to automobile manufacturers.

The electronic unit accommodating portion 13 is provided on its upper surface with a locked portion 13b which is a locking hole for locking and fixing the locking portion 17a formed on the lid 17.
Further, both inner surfaces 13f, 13f of the electronic unit accommodating portion 13 in a direction orthogonal to the opening 13a are made to project stepwise from a position opened by the thickness of the lid 17 from the edge of the opening 13a. 13f, 13f, the circuit board 16
Guide grooves 13c, 13c for slidably fitting both end edges of the
Is provided. Openings 13a of the guide grooves 13c, 13c
An inclined surface 13d is provided by notching in a tapered shape at the tip on the side. Further, a notch 13e for positioning is provided in the center of the lower part of the opening 13a.

Further, the opening 13 of the electronic unit accommodating portion 13
A housing 18 that houses a connection terminal (not shown) for electrically connecting the internal circuit housed inside the electrical junction box 10 and the circuit board 16 is attached to the closed side opposite to a. . In the housing 18, the electric connection portion of the connection terminal is aligned with the guide grooves 13c, 13c, and the circuit board 16 is inserted along the guide grooves 13c, 13c so that the connection can be established as shown in FIG. ing.

The lid 17 is set to fit inside the opening 13a of the electronic unit accommodating portion 13 so that its outer surface is flush with the edge of the opening 13a, and is locked to the locked portion 13b. A lock portion 17a and a mounting portion 17b for fixing the circuit board 16 in a replaceable manner are provided. Further, a through hole 17c through which a connector 20 for connecting an external wire harness attached to the circuit board 16 is projected is provided. Further, the positioning notch 1 is provided at the center of the lower end of the lid 17.
A protrusion 17d that engages with 3e is provided. When the connector 20 for connecting the external wire harness is not connected to the circuit board 16, the through hole 17c is not formed.

The lock portion 17a has an elastic portion 17f projecting in a U-shape from the inner surface of the lower end of a notch portion 17e formed in the center of the upper end of the lid 17, and an upper portion of the elastic portion 17f folded back in a U-shape. The locking claw portion 17g for

The mounting portion 17b is provided with the guide groove 13 described above.
c, 13c, which is composed of sandwiching plate portions 17h, 17h projecting from the inner surface of the lid 17 in the width direction from the inner surface, the circuit board 16 is inserted between these sandwiching plate portions 17h, 17h, and screwed by a screw 21. Then, the circuit board 16 is fixed. The mounting structure of the circuit board 16 and the lid 17 is not limited to the above-described structure, and the circuit board 16 and the lid 17 are not limited thereto.
In addition, it is also possible to provide an uneven portion that fits with each other.

The circuit board 16 is provided with printed circuit parts (not shown) on both upper and lower surfaces thereof in the same manner as in the conventional case, and is replaceably attached to the lid 17 according to the type and grade of the automobile. There is. Further, the circuit board 16 connects the electronic parts 15 such as a diode and a capacitor to be mounted to the circuit part, and connects the connection part 22 at the tip of the circuit part to the connection terminal housed in the housing 18. ing. In the present embodiment, the connector 20 for connecting to the connector 24 of the external wire harness 23
And connect the fitting portion 20a of the connector 20 to the lid 17
Of the through hole 17c.

When assembling the electric junction box 10 with the built-in electronic unit, first, as shown in FIG.
The upper case 12 having a fitting portion 12b such as a fuse and a relay formed on 2a is fitted to the lower case 11.

Next, the circuit board 16 on which the required electronic parts 15 are mounted is selected according to the type and grade of the automobile,
The circuit board 16 mounted in advance by screwing on the mounting portion 17b of the lid 17 is prepared. In this state, the fitting portion 20a of the connector 20 for connecting the external wire harness is attached to the lid 1
7 through the through hole 17c.

Then, the circuit board 16 is made to correspond to the guide grooves 13c, 13c of the electronic unit housing portion 13 formed in the lower case 11, and the circuit board 16 is inserted along the guide grooves 13c, 13c. At this time, the guide groove 13c,
Since the tapered inclined surface 13d is provided at the tip of the opening side of 13c, insertion workability can be improved.

By inserting the circuit board 16, the connecting portion 22 of the circuit board 16 is connected to the connecting terminal of the housing 18 mounted inside the electronic unit accommodating portion 13. At the same time, the lock portion 17a of the lid 17 is locked to the locked portion 13b so that the opening 13a of the electronic unit accommodating portion 13 is closed.
Then, the electric junction box 10 is completely assembled.
The upper case 12 may be fitted after the circuit board 16 to which the lid 17 is attached is attached to the electronic unit accommodating portion 13.

By the lid 17, the electronic unit accommodating portion 13
With the opening 13a closed, the outer surface of the lid 17 and the opening end surface of the electronic unit accommodating portion 13 are flush with each other.
That is, when these are not flush with each other and the lid 17 is in a state of protruding from the electronic unit accommodating portion 13, the operator can determine that the lid 17 is not inserted in the normal state, and the circuit It is possible to prevent the board 16 from being in a half-fitted state.

As described above, in the electric connection box 10, the circuit board 16 can be detachably attached to the electronic unit accommodating portion 13 integrally formed with the lower case 11, and therefore, by shipping to the automobile manufacturer in the attached state. At the time of this shipment, the circuit board 16 on which the electronic component 15 is mounted can be protected. Therefore, it is possible to reduce the number of parts by eliminating the need for an electronic unit housing box different from the electrical junction box shown in the conventional example, reduce the manufacturing cost, and use only one part when shipping to an automobile manufacturer. Since it is improved, the transportation cost can be reduced.

Further, as described above, the circuit board 16 is not connected in the automobile assembly line, but in the electric junction box 1.
Since the connection is made at the time of assembling 0, the continuity test of the assembled state can be performed, and thus the reliability of the electric junction box 10 can be improved by eliminating fitting defects and the like.

[0027]

As is apparent from the above description, in the electric junction box of the present invention, the circuit board on which the required electronic components are mounted is selected according to the vehicle type and grade of the automobile, and is replaceably attached to the lid, Since the circuit board is detachably attached to the electronic unit accommodating portion integrally formed in the lower case in this state, the circuit board on which the electronic component is mounted can be protected by shipping to the automobile manufacturer in this state. . Therefore, it is possible to reduce the number of parts and reduce the manufacturing cost by eliminating the need for a conventional electronic unit housing box. Further, since the electronic unit is not connected in the automobile assembly line but is connected in assembling the electric junction box, it is possible to conduct a continuity test of the assembled state. Further, since the product is shipped to the automobile manufacturer in this state, that is, only one part needs to be shipped, the cost for transportation can be reduced.

Further, by providing guide grooves on both inner surfaces of the electronic unit accommodating portion and by forming a tapered notch on the opening side end of the guide groove, the workability of inserting the circuit board into the electronic unit accommodating portion is improved. Can be improved. Further, by configuring the lid attached to the circuit board so as to be flush with the opening edge of the electronic unit accommodating portion, the operator can easily determine that the circuit board is in the half-fitted state. it can.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a circuit board on which an electronic component is mounted is inserted into an electric junction box of the present invention.

FIG. 2 is a cross-sectional view showing a state in which a circuit board is attached to an electric junction box.

FIG. 3 is a side view showing an electronic unit accommodating portion formed in a lower case that constitutes an electric junction box.

FIG. 4 is an exploded view showing a conventional electrical junction box and electronic unit housing box.

[Explanation of symbols]

10 electrical junction box 11 lower case 11a bottom wall outer surface 12 upper case 13 Electronic unit housing 13a opening 13b Locked part 15 Electronic components 16 circuit board 17 Lid 17a Lock part

   ─────────────────────────────────────────────────── ─── Continued front page       (56) Reference JP-A-6-105434 (JP, A)                 Actual Kaihei 5-62126 (JP, U)                 Actual Kaihei 6-70424 (JP, U)

Claims (2)

(57) [Claims] 1. A box-shaped electronic unit accommodating portion having one side surface opened from a part of an outer surface of a bottom wall of a lower case of an electrical junction box, while the electronic unit accommodating portion is provided with a vehicle type and a grade of an automobile. A circuit board on which electronic parts are mounted is inserted so that the electronic unit accommodating portion is closed by the lid, and the lid is detachably attached to one end of the circuit board. The lock portion is locked and fixed to the locked portion provided in the electronic unit accommodating portion, the through hole is provided in the lid, and the connector connected to the circuit of the circuit board is passed through the through hole, Connector mating part
Is an electric connection box for a vehicle with a built-in unit configured to project to the outside and connect to the connector of the external wire harness outside the lid . 2. A guide groove for slidably fitting both end edges of the circuit board is provided on both inner surfaces in a direction orthogonal to the opening of the electronic unit accommodating portion, and an opening side end of the guide groove is tapered. The electric connection box for automobiles with a built-in electronic unit according to claim 1, which is notched.