JPH0888919A - Waterproofing structure for electric junction box - Google Patents

Abstract

PURPOSE: To provide a low-cost waterproofing structure for an electric junction box which can deal with the case that an electric wire group has a large diameter. CONSTITUTION: The waterproofing structure for an electric junction box comprises a containing box 12 for containing the box 11, and an upper cover 13 for closing the upper opening 12a of the box. A wire inlet 14 opened at the upper surface is provided at the sidewall 12a of the box. The structure also comprises sealing materials filling grooves 18 for filling the sealing materials are provided on the periphery of the inlet and the upper end face of the box. The structure also comprises a cylindrical part 17a for passing the group connected to the box in a sealed state and a resin holder 17 formed by engaging with the inlet and continuing the mount 17b of the shape in contact with the upper cover. The holder 17 is passed through the group in the shape split along the longitudinal direction of the wire and then closed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure for an electric connection box, and more specifically, a wire for closing an upper opening of a storage box accommodating the electric connection box with a lid and connecting the electric connection box to a side wall of the storage box. The present invention relates to a waterproof structure for an electric connection box, which is provided with an electric wire inlet for taking the group into the accommodation box.

[0002]

2. Description of the Related Art Conventionally, as a waterproof structure of an electric connection box of this type, as shown in FIG. 5, a wire bundle (wire harness) 2 is inserted through an elastic waterproof grommet 1, and a resin is attached to the grommet 1. After fitting the inner member 3 made of
The electric connection box 8 is accommodated in the electric wire intake port 5 formed in the housing box 4, and the upper opening 6 a of the housing box 4 is closed by the upper lid 6. The grommet 1 is in close contact with the peripheral surface of the electric wire intake port 5, and the rubber sponge 7 provided around the lower end edge of the upper lid 6 is in close contact with the upper end edge of the storage box 4. The electric junction box is waterproofed by sealing.

[0003]

However, the above conventional waterproof structure has the following problems. First, when inserting the wire bundle 2 into the grommet 1, it is necessary to enlarge the diameter of the insertion hole 1a of the grommet 1 with a rod-shaped jig (not shown), which is a troublesome work. If the wire bundle 2 has a large diameter, it may not be inserted even if the diameter of the insertion hole 1a is increased.
Further, in this waterproof structure, two parts, the grommet 1 and the inner member 3, are required to insert the electric wire bundle 2, so that the cost becomes high.

The present invention has been made for the purpose of solving the above-mentioned conventional problems and providing a waterproof structure of an electric junction box which can cope with a large-diameter electric wire bundle and is low in cost. is there.

[0005]

According to a first aspect of the present invention, there is provided a housing box for housing an electrical connection box, and an upper lid for closing an upper surface opening of the housing box. While the inlet is provided, a continuous sealing material filling groove is provided on the peripheral surface of the electric wire inlet and the upper end surface of the housing box, and the sealing material is filled in the sealing material filling groove. The cylindrical portion that penetrates the electric wire group to be connected to the electric junction box in a close contact state is provided with a resin holder that is continuously formed with a mounting portion that fits into the electric wire inlet and contacts the upper lid, The resin holder provides a waterproof structure for an electric connection box, characterized in that it has a shape that is divided into two along the length direction of the electric wire and that the electric wire group is penetrated and then closed.

According to a second aspect of the present invention, there is provided a waterproof structure for an electric connection box according to the first aspect, in which a rubber sponge is attached to an upper lid that abuts the attachment portion of the holder.

A third aspect of the present invention provides a waterproof structure for an electrical connection box according to the first or second aspect, wherein the sealing material filled in the sealing material filling groove is silicon rubber.

According to a fourth aspect of the present invention, there is provided an electrical junction box according to any one of the first to third aspects, wherein the holder has two half side portions connected by a thin hinge and a lock portion for detachably locking each other. It provides a waterproof structure.

[0009]

In the waterproof structure of the electrical junction box according to the first aspect, the sealing material is filled in the sealing material filling groove provided on the peripheral surface of the electric wire inlet and the upper end surface of the housing box. The space between the boxes and the space between the holder and the electric wire inlet are sealed, and the electric connection box in the storage box is reliably waterproofed. Further, in the waterproof structure according to claim 1, since the resin holder has a shape that is divided into two along the length direction of the electric wire and is closed after the electric wire group is penetrated, a jig or the like is provided. There is no need to use the wire to penetrate the wire, and the work of forming the waterproof structure is simple.

In the waterproof structure according to the second aspect of the present invention, the rubber sponge attached to the upper lid comes into contact with the attachment portion of the holder, so that the gap between the upper lid and the holder is also sealed, and the electric connection box in the storage box is more reliably waterproofed. .

In the waterproof structure according to the third aspect, since the sealing material is silicon rubber, the sealing material is in close contact with the lower end portion of the upper lid and the outer periphery of the holder, and these portions are reliably sealed.

In the waterproof structure according to the fourth aspect of the present invention, the lock portion is removed, the thin hinge portion is bent, and the half side portion of the holder divided into two is opened to easily connect the wire group without using a jig or the like. Can penetrate the holder.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in the drawings. As shown in FIG. 1, in the waterproof structure according to the present embodiment, the electric connection box 11 is housed in the housing box 12, and the top opening 12a of the housing box 12 is closed by the lid 13.

The side wall 12a of the housing box 12 is provided with a substantially U-shaped electric wire intake port 14 having an open upper surface. The electric wire intake port 14 connects the electric wire group 15 to the electric connection box 11. The holder 17 which is penetrated in close contact is fitted.

A seal material filling groove 18 having a rectangular cross section is provided on the entire circumference of the electric wire intake port 14 of the housing box 12 and the upper end surface 12b of the side wall 12a, and 18 seals are provided in the seal material filling groove. Filled with material 19 (only shown in FIG. 2). In this embodiment, silicone rubber is used as the sealing material 19. However, the sealing material 19 is not limited to silicone rubber, and may be ordinary rubber or resin having elasticity.

The holder 17 is made of resin and has a cylindrical portion 17a and a mounting portion 17b which are continuously provided. Tube 1
7a is a tubular shape having a rectangular cross section,
The electric wire group 15 connected to is penetrated in a close contact state. Also,
The cylindrical portion 17a is the first portion 17 connected to the mounting portion 17b.
c and a second portion 17d bent downward from the first portion 17c in FIG. The mounting portion 17b has a fitting portion 17e having an outer shape that fits in the sealing material filling groove 18 provided in the wire mounting opening 14, and side walls 18a and 18a of the sealing material filling groove 18 from the fitting portion 17e. It is provided with a flange-shaped portion 17f provided with an interval slightly larger than the thickness. The cylindrical portion 1 is attached to the mounting portion 17b.
Opening 17d that connects the inside of 7a and the inside of housing box 12
Is provided. In addition, the upper end surface 17g of the fitting portion 17e
A ridge 17h is provided on the base plate 17a so that the ridge 17h comes into contact with a rubber sponge 23 attached to an upper lid 17, which will be described later.

As shown in FIGS. 3 and 4, the holder 17 has a shape in which the electric wires 20 constituting the electric wire group 15 are divided into two parts 17-1 and 17-2 along the length direction. , A pair of lock portions 26 each including a lock protrusion 24 and a lock arm portion 25 on the first portion 17c of the tubular portion 17a.
A and 26B are provided facing each other. Further, the second portion 17d of the tubular portion 17a has half-side portions 17-1, 17- on one side.
Thin hinges 27A and 27B for connecting the two are provided, and a lock portion 26C is provided to face the thin hinges 27A and 27B. The lock portions 26A, 26B, and 26C can detachably lock the half side portions 17-1 and 17-2 to each other, thereby disengaging the lock portions 26A, 26B, and 26C and bending the thin hinges 27A and 27B. No half side 17-1,
By opening 17-2, the wire group 15 can be easily inserted without using a jig or the like.

The side wall 13a of the upper lid 13 is provided with a lock claw 30 which is detachably engaged with the locking arm 29 provided on the side wall 12a of the storage box 12. Further, the thickness of the lower end portion 13b of the side wall 13a of the upper lid 13 is set to be slightly smaller than the width of the sealing material filling groove 18, and when the upper lid 13 closes the upper surface opening 12a of the storage box 12, The lower end portion 13b is fitted in the sealing material filling groove 18a. In addition, the lower end portion 13b of the side wall 13a
A housing recess 13c is provided in a portion of the holder 17 that abuts the mounting portion 17b.
The rubber sponge 23 is housed therein.

In the case of forming the waterproof structure of this embodiment having the above structure, first, the electrical junction box 1 is placed in the accommodation box 12.
1 is accommodated, and the sealing material 19 is injected into the entire sealing material filling groove 18. On the other hand, the lock portions 26A, 26B and 26C of the holder 17 are removed to remove the thin hinge 27.
By bending A and 27B, the half side portions 17-1 and 1
7-2 is opened and the wire group 15 is inserted into the holder 17. Locking part 26 by closing half side parts 17-1 and 17-2
When A, 26B, and 26C are locked, the wire group 15 is in a state of penetrating the cylindrical portion 17a of the holder 17 in a close contact state.
As described above, in the present embodiment, unlike the conventional waterproof structure using the grommet shown in FIG. 5, the wire group 15 can be passed through the holder 17 without using a jig, etc. Structure formation work is simple.

Next, the holder 1 in which the wire group 15 is passed through
The mounting portion 17 b of No. 7 is fitted into the electric wire inlet 14 of the accommodation box 12. At this time, the fitting portion 17e is inserted into the sealing material filling groove 18
And the flange portion 17f is inserted into the housing box 12
Is located inside the fitting part 17e and the flange-shaped part 17f.
The side wall 18a of the sealing material filling groove 18 is sandwiched by. Further, the upper lid 13 closes the upper opening 12 a of the storage box 12. At this time, as described above, the side wall 13 of the upper lid 13
The lower end portion 13b of a is fitted into the sealing material filling groove 18.
The locking claw 30 is locked to the locking arm 29, and the upper lid 13
2 is attached to the storage box 12, as shown in FIG.
The sealing material 19 is filled between the lower end surface 13 a of the nozzle 3 and the sealing material filling groove 18, and the sealing material 19 is also filled between the periphery of the mounting portion 17 b of the holder 17 and the sealing material filling groove 18. Further, the protrusion 17h provided on the upper end surface 17g of the attachment portion 17b of the holder 17 comes into contact with the rubber sponge 23 attached to the upper lid 13. As described above, in the waterproof structure of this embodiment, the gap between the holder 17 and the electric wire inlet 14 is sealed by the sealing material 19 and the rubber sponge 23, and
The electric junction box 11 housed inside is reliably waterproof.

[0021]

As is apparent from the above description, in the waterproof structure of the electric connection box according to the first aspect, the seal is provided in the sealing material filling groove provided on the peripheral surface of the electric wire inlet and the upper end surface of the storage box. Since the material is filled, the space between the upper lid and the storage box and the space between the holder and the electric wire inlet are sealed, and the electric connection box in the storage box can be reliably waterproofed. In addition, claim 1
The waterproof structure of No. 1 has a resin holder that is divided into two along the length direction of the electric wire and has a shape that is closed after penetrating the electric wire group. As described above, the work of penetrating the electric wire by using a jig or the like is not required, and the waterproof structure can be formed by a simple work. In the waterproof structure according to claim 1,
As described above, since it is configured to pass through the holder divided into two parts, it is possible to reliably pass the wire bundle through the holder even when the diameter of the wire bundle is large.

Further, in the waterproof structure according to claim 1, since the member through which the bundle of electric wires is inserted is only one part of the holder made of resin, the conventional waterproof structure requires two parts of the grommet and the inner member. It is low cost in comparison.

In the waterproof structure according to the second aspect, since the rubber sponge attached to the upper lid comes into contact with the attaching portion of the holder, the gap between the upper lid and the holder is also sealed, and the electric connection box in the storage box is more reliably waterproofed. You can

In the waterproof structure according to the third aspect, since the sealing material is silicon rubber, the sealing material can be brought into close contact with the lower end portion of the upper lid and the outer circumference of the holder, and high sealing performance can be obtained.

In the waterproof structure according to the fourth aspect, if the lock portion is removed and the thin hinge portion is bent to open the half side portion of the holder divided into two, the wire group can be easily assembled without using a jig or the like. The holder can be penetrated and the work of forming the waterproof structure is easy.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a waterproof structure of an electrical junction box according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a fitted state of a holder.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is an exploded perspective view showing an example of a conventional waterproof structure for an electric connection box.

[Explanation of symbols]

 11 Electrical Connection Box 12 Storage Box 13 Upper Lid 14 Electric Wire Intake Port 17 Holder 17a Tube 17b Mounting Part 18 Sealing Material Filling Groove 19 Sealing Material 23 Rubber Sponge

Claims (4)

[Claims] 1. An accommodation box for accommodating an electrical connection box, and an upper lid for closing an upper surface opening of the accommodation box, wherein a side wall of the accommodation box is provided with an electric wire inlet having an open upper surface, A continuous sealing material filling groove is provided on the peripheral surface of the electric wire inlet and the upper end surface of the housing box, and the sealing material is filled in the sealing material filling groove. A resin holder in which a mounting portion having a shape that fits into the electric wire intake port and abuts on the upper lid is continuously formed is provided in the cylindrical portion that penetrates in a close contact state, and the resin holder is the length of the electric wire. A waterproof structure for an electrical junction box, characterized in that it has a shape that is divided into two along the direction and that is closed after the electric wire group is penetrated. 2. The waterproof structure for an electrical connection box according to claim 1, wherein a rubber sponge is attached to an upper lid that abuts the attachment portion of the holder. 3. The waterproof structure for an electrical junction box according to claim 1, wherein the sealing material filled in the sealing material filling groove is made of silicon rubber. 4. The holder according to claim 1, wherein the holder is provided with a lock portion that connects the two divided half side portions with a thin hinge and detachably engages with each other.
Waterproof structure of the electrical junction box described in paragraph.