JPH06243913A - Waterproof structure for electric wire connecting part - Google Patents

Abstract

PURPOSE:To obtain a waterproof structure for an electric wire connecting part wherein a plurality of electric wires are connected to each other by a very simple constitution and further capable of surely ensuring insulation and water-tightness. CONSTITUTION:A receiving case 17 is a cylindrical case opened to an upper part, and a pair of opposed detent receiving parts 18 are provided in peripheral wall upper parts, to charge the inside of the case with a required amount of conductive fillers 19. On the other hand, external wall seal parts 16 formed in an annular rib such as coming into press contact with an internal wall 17a of the receiving case 17 are provided in a lower end part on a peripheral wall of a cylindrical rubber plug 13, and a pair of opposed stop protrusions 15, engaged with the detent receiving parts 18 provided in the receiving case 17, are formed on the peripheral wall in the upward from the seal parts 16. Further in the rubber plug 13, through holes 14 for inserting connecting terminals 12, crimped to point end conductor parts of lead wires 11, are drilled in accordance with a number of the lead wires 11. An internal wall seal part, formed in an annular rib so as to come into press contact when inserted the connecting terminal 12, is formed on an internal peripheral wall of this through hole 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure of an electric wire connecting portion for ensuring insulation and waterproofness of a branch portion of a connecting electric wire such as a wire harness and a connecting portion between electric wires.

[0002]

2. Description of the Related Art Generally, when connecting a plurality of electric wires, each end of the electric wire is cut off to connect the conductors to each other with a conductive material such as solder, and the periphery of the connection is covered with an insulating material. ing. In this case, it is necessary for the electric wire connecting portion to have an insulating property and have a waterproof structure that prevents water and the like from entering. Therefore, a method of molding the periphery of the connecting portion with a resin material or the like, or a method of using a connector having a waterproof structure is adopted. First, as a conventional example of molding with a resin material,
For example, there is one as shown in FIGS. In FIG. 5, the electric wire 4 and the electric wire 5 are electrically connected using the connecting conductor 6, and the connection portion is molded with resin 7 and waterproofed. In this molding method, the electric wire connection portion is placed in a predetermined mold, and molten resin is poured into the predetermined portion to cure the electric wire connection portion.

FIG. 6 shows that an electric wire 4 and an electric wire 5 are electrically connected by using a connecting conductor 6, and then an insulating sheet 1 such as vinyl chloride coated with an insulating material 1 having an adhesive property such as butyl rubber. After the connection portion is placed and wound up with the insulating sheet 2, the end portion of the insulating sheet 2 is already wound.
It is to be adhered to the back surface of the adhesive with an adhesive and fixed by winding.

FIGS. 7 and 8 show the structure of a conventional electric connector for connecting wire harnesses to each other.
This is composed of a male connector 1 and a female connector 2, and a plurality of female terminals 2d provided inside the female connector 2 are inserted through a male terminal 1d incorporated in a male connector housing 1a. It has a structure that can be connected to the lead wire 1e. The male connector 1 is connected to a male terminal 1d which is fixed in the terminal accommodating chamber 1b inside the male connector housing 1a by a locking lance 1c and fixed to the end of the lead wire 1e. A packing 1f for tightly fitting the gap between the opening of the terminal accommodating chamber 1b and the lead wire 1e to obtain the waterproof property inside the male connector housing 1a.
Is inserted into the lead wire 1e.

Further, the female connector 2 has a locking lance 2c in a terminal accommodating chamber 2b inside the female connector housing 2a.
The female terminal 2d, which is fixed to the end of the lead wire 2e, is connected to the female terminal 2d. Then, it is tightly fitted in the gap between the opening of the terminal accommodating chamber 2b and the lead wire 2e,
A packing 2f for waterproofing the inside of the female connector housing 2a is fitted and inserted in the lead wire 2e. Further, it has a locking piece 2g for holding the fitting with the male connector 1.
Then, when the male connector 1 and the female connector 2 are fitted to each other, a packing 3 for keeping watertight between the two connector housings is fitted in the inner bottom of the female connector housing 2a.

[0006]

However, the conventional waterproof structure as described above has the following problems. First, in the case of the one shown in FIG. 5, water may infiltrate from the boundary portion A between the electric wire and the resin, which may cause rust at the electric wire connecting portion to cause conduction failure, leak current, etc. You can work only where there is equipment. Further, in the case shown in FIG. 6, when the number of branched poles is increased, sufficient waterproofness cannot be secured only by the process of winding the insulating material around the insulating sheet. Further, depending on the operator, the work of crimping the connecting conductor requires difficulty, which causes variations in the manufacturing process.

7 and 8, the waterproof property can be ensured even when the number of branched poles is increased, but many constituent parts are required for that and the manufacturing process There is a problem in that the number increases and the cost increases. The object of the present invention is made in view of the above problems, and provides a waterproof structure of an electric wire connecting portion capable of reliably ensuring insulation and waterproofness with a very simple structure for connecting a plurality of electric wires to each other. To do.

[0008]

The above object of the present invention is to provide a waterproof structure of an electric wire connecting portion for branching a plurality of connecting electric wires or connecting a plurality of electric wire ends when connecting the connecting electric wires to each other. , An electric wire having a sealing portion on the inner wall thereof, in which an outer peripheral wall is provided with a locking projection and a sealing portion which engage with the locking receiving portion in an opening portion of a housing case having a required amount of filler and having the locking receiving portion Fit the lid with multiple through holes for
By inserting the wire end into the through hole, the wire end is connected and fixed in the accommodating case as the filler hardens. be able to. Further, the above object can be achieved when the filler is an epoxy resin having conductivity. Further, the above-mentioned object can be achieved by providing a connecting terminal having a disc portion for preventing the slip-off at the tip of the electric wire end portion.

[0009]

[Operation] After putting the required amount of filler in the storage case,
The lid is fitted into the housing case by inserting the lid from the opening of the housing case, and the locking projection of the lid being locked by the locking receiving portion of the housing case. At this time, the upper surface of the filler is in contact with the lower surface of the lid and is sealed by the seal portion provided on the outer peripheral wall of the lid, so that the waterproof property between the lid and the housing case is ensured. Next, insert the end of the wire into the through hole of the lid, and further push it toward the bottom of the housing case so that it is fully immersed in the filler.The end of the wire is fixed as the filler hardens, and the wire penetrates. The seal portion formed on the inner wall of the hole provides a watertight seal.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the waterproof structure of an electric wire connecting portion according to the present invention will be described in detail below with reference to FIGS.
FIG. 1 is a perspective view of a waterproof structure of an electric wire connecting portion showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line CC of FIG. 1 showing a state before a rubber plug is fitted into a housing case, and FIG. FIG. 4 is a cross-sectional view showing a state in which a rubber stopper is fitted in a housing case containing a required amount of filler, and FIG. 4 is a cross-sectional view showing a state in which an end of a wire is inserted into the housing case and assembly is completed.

As shown in FIG. 1, the electric wire connecting portion according to the present invention mainly comprises a housing case 17 and a rubber plug 13. The housing case 17 is a cylindrical case having an opening at the top, and a pair of opposed lock receiving portions 18 is provided on the upper part of the peripheral wall. A conductive filler 19 is filled in the case in a required amount. There is. On the other hand, at the lower end portion on the outer peripheral wall of the cylindrical rubber plug 13, an outer wall seal portion 16 forming an annular rib that comes into pressure contact with the inner wall 17a of the housing case 17 is provided, and on the outer peripheral wall above the seal portion 16. A pair of opposed locking projections 15 that engage with a locking receiving portion 18 provided on the housing case 17 are formed. Further, the rubber plug 13 has a through hole 1 for inserting the connection terminal 12 crimped to the tip conductor portion of the lead wire 11.
4 are provided according to the number of lead wires 11. An inner wall seal portion 14a forming an annular rib is formed on the inner peripheral wall of the through hole 14 so as to make pressure contact when the connection terminal 12 is inserted. In addition, a disc portion 12a for preventing slipping off is formed at the tip of the connection terminal 12 so as to have a disc-like diameter.

Next, the assembly by the above-mentioned components will be described. As shown in FIG. 2, first, a required amount of filler 19 is put in the housing case 17. In this embodiment, the filler 19 is a conductive material having a specific resistance of about 10 ⁻⁵ cm · Ω, and is a thermosetting material that is well compatible with vinyl chloride, PBT (polybutylene terephthalate), PP (polypropylene), nylon and the like. Epoxy resin. The required amount of the filler 19 is the amount of the filler 1 when the rubber stopper 13 is fitted into the housing case 17 to engage the locking projection 15 and the locking receiving portion 18.
9 contacts the lower surface 13a of the rubber plug 13 and slightly penetrates the lower edge of the through hole 14, that is, the height h ₂ from the surface of the resin filled in the housing case 17 to the lower edge of the lock receiving portion 18. Further, the height h ₁ from the lower edge of the locking projection 15 of the rubber plug 13 to the rubber plug lower surface 13a is slightly increased. Then, as shown in FIG. 3, the rubber plug 13 is fitted into the housing case 17 from the open upper portion thereof, and further pushed downward while the outer wall seal portion 16 is in contact with the inner wall 17a of the housing case 17. The stopper projection 15 engages with the lock receiving portion 18 on the housing case 17 side, and the rubber plug 13 is fixed to the housing case 17.

Next, as shown in FIG. 4, the connection terminal 12 fixed to the tip conductor portion of the lead wire 11 is inserted into the through hole 14, and the connection terminal 12 is dipped in the filler 19 and accommodated therein. It is further pushed toward the bottom surface of the case 17. In this state, the lead wire 11 is connected to the inner wall seal portion 14a of the through hole 14.
And is pressed in a watertight state. Then, the filler 19 which is a thermosetting epoxy resin is allowed to stand at room temperature or high temperature (heating) and cured. As a result, the lead wire 11 is fixed in a watertight state in the housing case 17, and the lead wire 11 is electrically connected by the conductive filler 19 so that the lead wire can be branched. Further, since the filler 19 is completely sealed by the outer wall seal portion 16 and the inner wall seal portion 14a, the lead wire 11 can be installed even if the filler 19 is not completely cured. It is possible to improve efficiency.

Further, when a tensile force in the P direction acts on the lead wire 11, the disc portion 12a of the connection terminal 12 prevents the connection terminal 12 from coming off. Even if the connecting terminal 12 is not fixed to the end of the lead wire 11 and is inserted into the through hole 14 as it is, a sufficient holding force can be obtained by the pressure contact force of the inner wall seal portion 14a and the hardening of the filler 19. .

The present invention is not limited to the above embodiment, but as an application example, if the ground terminal 20 is press-fitted from the bottom surface of the housing case 17 in advance, a vehicle body grounding specification is also possible. Further, it is desirable that the required amount of the filler 19 is minimized in consideration of the shape of the housing case and the rubber plug, and the cylindrical structure is used in this embodiment, but the present invention is not limited to the cylindrical shape. Of course.

[0016]

As described above, according to the waterproof structure of the electric wire connecting portion of the present invention, the lid body provided with the seal portion is fitted into the housing case containing the filler, and the through hole of the lid body is fitted. Since the structure is such that the connection terminal is inserted through the connector, the configuration is extremely simple and the number of component parts is small. Therefore, the number of processing steps and the number of assembly steps of the component parts are small, and a waterproof type wire harness branch part can be produced at low cost.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a waterproof structure of an electric wire connecting portion according to the present invention.

FIG. 2 is a sectional view taken along line CC of FIG. 1 showing a state before a rubber plug is fitted into a housing case.

FIG. 3 is a cross-sectional view showing a state where a rubber plug is fitted into a housing case containing a filler.

FIG. 4 is a cross-sectional view showing a state in which an electric wire end is inserted into a housing case and assembly is completed.

FIG. 5 is a sectional view of a first conventional example.

FIG. 6 is a sectional view of a second conventional example.

FIG. 7 is a perspective view of a connector which is a third conventional example.

8 is a cross-sectional view taken along line BB of FIG.

[Explanation of reference numerals] 11 lead wire (electric wire) 12 connection terminal 12a disk portion 13 rubber stopper (lid) 13a rubber stopper lower surface 14 through hole 14a inner wall seal portion 15 locking protrusion 16 outer wall seal portion 17 storage case 17a storage case Inner wall 18 Lock receiving part 19 Filler 20 Ground terminal

Claims (3)

[Claims] 1. In a waterproof structure of an electric wire connecting part for branching a plurality of connecting electric wires or for connecting a plurality of electric wire ends when connecting the connecting electric wires to each other, a predetermined amount of a filler is put and a locking receiver is provided. A lid having a locking projection and a sealing portion, which engage with the locking receiving portion, is provided on an outer peripheral wall in an opening of a housing case having a portion, and a plurality of wire through holes having a sealing portion are formed on the inner wall. By fitting and inserting the electric wire end portion into the through hole, the electric wire end portion is connected and fixed in the accommodating case as the filler hardens. Construction. 2. The waterproof structure for a wire connecting portion according to claim 1, wherein the filler is an epoxy resin having conductivity. 3. The waterproof structure for an electric wire connecting portion according to claim 1, wherein the electric wire end portion is provided with a connecting terminal having a disc portion for preventing the wire from being pulled out.