JPH1186921A - Earth terminal, earth structure, and manufacture of earth terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earth terminal, an earth structure, and manufacturing method of the earth terminal, capable of mounting a plurality of wires inexpensively and easily. SOLUTION: An earth terminal 1 is a mold of a conductive material, and is provided with a cylindrical large diameter part 3 and a small diameter part 4 whose diameter is smaller than that of the large diameter part 3 in sequence. An earth part 5 is extended from a lower part of the small diameter part 4. A wire 2 whose core wires 2B are exposed by removing a coated part 2A of an end part is inserted from an opening 3A and pressed into the interior of the small diameter part 4. A shielding material 11 is poured from the opening 3A and solidified to make a connecting part of the core wire 2B and a wire connecting part 9 a waterproof structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a ground terminal, a ground structure, and a method of manufacturing a ground terminal.

[0002]

2. Description of the Related Art FIG. 8 (JP-A-60-119086) shows a state in which a ground terminal 100 is connected to the end of an electric wire W extending from a circuit (not shown) requiring grounding. . In this device, the electric wire W is caulked by a barrel 101 provided at the rear part of the ground terminal 100, a rubber cap 102 is covered on the electric wire connection portion, and a sealing material 103 is poured into the cap 102. It has a waterproof structure.

[0003]

However, in a structure in which the periphery of the wire connection portion is sealed using the ground terminal 100 and the cap 102, the cap 102 is tightly attached to the wire so that the sealing material 103 does not leak. It has to be inserted, which is troublesome. Also, if the filling amount of the sealing material 103 varies, the barrel 101 does not sufficiently enter the inside of the sealing material 103, so that the sealing property is impaired. The sealing material 103 is attached to the ground part 100A.

The present invention has been made in view of the above circumstances, and has as its object to provide a ground terminal, a ground structure, and a method of manufacturing a ground terminal which can prevent a sealing material from adhering to a ground portion of the terminal. is there.

[0005]

According to a first aspect of the present invention, there is provided an earth terminal comprising: a ground portion connected to a ground plane; and a wire connection portion connecting a plurality of wires. The entire wire connection portion is formed in a bottomed cylindrical shape, and on the bottom side thereof, the core portion exposed at the tip of each wire is housed in a substantially closely inserted state and in contact with the inside. While a small diameter part connected to the ground part is formed,
A large diameter portion for filling a sealing material is formed on the opening side of the electric wire connection portion.

According to a second aspect of the invention, there is provided a grounding structure, wherein each core portion exposed at the tip of each of the plurality of electric wires is substantially closely inserted into the small-diameter portion and contacts the inside of the small-diameter portion. The ground portion is connected to a ground surface while the large diameter portion is filled with a sealing material.

According to a third aspect of the present invention, there is provided a method of manufacturing an earth terminal according to the first aspect, wherein a ground terminal material formed by connecting pipes having different diameters in a longitudinal direction is used. The tip of the pipe is crushed to form the ground portion, and at the time of crushing, a waterproof member is interposed.

[0008]

According to the first or second aspect of the present invention, the electric wire having the core wire at the end exposed is inserted into the small-diameter portion via the large-diameter portion of the wire connection portion, and each core wire portion is reduced in diameter. In contact with the wall of the part. After that, if the large diameter portion is filled with a sealing material, the electric wire connection portion will be in a sealed state, so that a situation where water enters the inside of the electric wire coating can be avoided.

Therefore, according to the first aspect of the present invention, a structure is provided in which a portion for filling the seal (large-diameter portion) is separated from a portion for connecting the electric wire (small-diameter portion). As compared with the method of solidifying the connection portion with a sealing material, the penetration of the sealing material into the portion where the electric wire and the ground terminal are connected is small, and a stable connection state can be realized.

According to the third aspect of the present invention, when the distal end of the small-diameter pipe is crushed, the waterproof member comes into close contact with the inner wall of the pipe to form an earth portion. For this reason, the ground portion is in a watertight state.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] Next, a first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a perspective view of the ground terminal 1. The ground terminal 1 is integrally formed of a conductive metal, and has a cylindrical large diameter portion 3, a small diameter portion 4, and a ground portion 5 from above in the figure. Among these, the large diameter part 3 and the small diameter part 4 form the electric wire connection part 9. Further, a step is provided between the large diameter portion 3 and the small diameter portion 4 by a step portion 6, and the small diameter portion 4 and the ground portion 5 are connected by a conical portion 7.

The large-diameter portion 3 is formed in a cylindrical shape with both ends open, and a small-diameter portion 4 concentric with and continuous with the large-diameter portion 3.
Are likewise cylindrical and their interiors communicate with each other. The small-diameter portion 4 and the conical portion 7 connected to the small-diameter portion 4 have a bottom surface. A mounting hole 10 penetrates through the center of the grounding portion 5, is fitted into a screw shaft provided on a grounding surface (not shown), and is tightened with a nut to connect the grounding terminal 1 to the grounding surface. .

The inner space of the portion from the small diameter portion 4 to the conical portion 7 is such that the core portions of a plurality of electric wires are inserted therein, and each core wire 2B exposed at the tip of each electric wire 2 is provided.
Can contact the inner wall surface of this portion (particularly, the small diameter portion 4). The inner space of the large-diameter portion 3 forms a sealing resin reservoir 8.

FIG. 3 shows a side cross section when the earth terminal 1 and the electric wire 2 configured as described above are connected. Electric wire 2
Is composed of an outer layer covering portion 2A and a core wire 2B. The covering portion 2A is removed to a predetermined position at the end portion, and the core wire 2B is exposed. A plurality of electric wires 2 thus treated
Are bundled while adjusting the position of the tip. Next, the end of the electric wire 2 is inserted into the ground terminal 1 from the opening 3A side. After pushing the electric wire 2 to a predetermined position, the electric wire 2 is crimped so that the small diameter portion 4 is slightly crushed from the outside. Thus,
The electric wire 2 is mounted in the small-diameter portion 4 in a substantially closely inserted state, and is electrically connected between the inner wall surface of the small-diameter portion 4 and the core wire 2B.

Next, a sealing material 11 (mold resin) is poured into the resin reservoir 8 from the opening 3A. This sealing material 11
Is for waterproofing a connection portion between the core wire 2B of the electric wire 2 and the electric wire connection portion 9, and is injected only into the resin storage portion 8 so as not to flow from the step portion 6 to the tip end side. When the sealing material 11 is poured into the opening 3A and then solidified, the connection between the electric wire 2 and the ground terminal 1 is strengthened, and the core wire 2B and the electric wire connection portion 9 are sealed from the outside,
A situation in which water enters the inside of the coating of the electric wire 2 is avoided.

As described above, according to the present embodiment, the large-diameter portion 3 for filling the sealing material 11 and the small-diameter portion 4 for connecting the electric wire.
And the ground terminal 1
Compared to a method in which the connection portion between the wire and the electric wire 2 is hardened with the sealing material 11, the penetration of the sealing material 11 into the electric wire connecting portion 9 is small, and a stable connection state can be realized.

Further, since the ground terminal 1 also has a waterproof function, the number of parts can be reduced as compared with the conventional case where the connector housing is used for waterproofing, which is advantageous in terms of cost.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS. This embodiment shows one embodiment for manufacturing the ground terminal 20 of the present invention. In the present embodiment and the first embodiment, the same components are denoted by the same reference numerals, and a part of the description is omitted. The ground terminal used in the second embodiment is a cast product in the first embodiment, but here, a material obtained by joining pipe materials having different diameters by welding or the like is used as a material.

FIG. 4 shows an earth terminal material 21 and a waterproof member 22 for manufacturing the earth terminal 20. The ground terminal member 21 is composed of two types of pipes 2 having different diameters.
3, 24 are connected. The outer diameter of the small-diameter pipe 24 is slightly larger than the inner diameter of the large-diameter pipe 23. By pressing the small-diameter pipe 24 into the large-diameter pipe 23, the two pipes 23 and 24 are kept in a watertight state. Be integrated. At this time, the connecting portion of the pipes 23 and 24 may be welded. Thus, the ground terminal material 21
Are open front and back, and the large-diameter pipe 23 side is an opening 23A for inserting the electric wire 2, while the small-diameter pipe 24
The waterproof member 22 is inserted from the opening 24A on the side.

The inside diameter of the small-diameter pipe 24 is the electric wire 2 to be inserted.
The diameter of the wire 2 is slightly larger than the diameter of the small diameter pipe 24. By slightly crushing the small diameter pipe 24, the electric wires 2 can be connected in a tightly inserted state. The waterproof member 22 is formed of a rubber plate having appropriate elasticity so as to be inserted into the inside of the small-diameter pipe 24 with a width substantially equal to the inner diameter of the small-diameter pipe 24.

Next, a method of manufacturing the ground terminal 20 according to the second embodiment having the above-described configuration will be described. First,
The waterproof member 22 is inserted into the small diameter pipe 24 through the opening 24A. The waterproof member 22 is pushed in until the distal end of the waterproof member 22 and the distal end of the small-diameter pipe 24 substantially match (FIG. 5).
See).

Next, the tip of the small diameter pipe 24 is pressed so that a force is applied from the thickness direction of the waterproof member 22. By doing so, the tip of the small-diameter pipe 24 is crushed, and the waterproof member 22 is sandwiched while being appropriately compressed by the small-diameter pipe 24. Next, a circular hole 25 is passed through this portion together with the waterproof member 22 so that the ground portion 2 is formed.
6 is assumed. At this time, since the waterproof member 22 is sandwiched between the ground portion 26, a watertight structure is provided. Further, the portion above the ground portion 26 corresponds to the electric wire connection portion 27 of the present invention.

Next, from the opening 23A of the large-diameter pipe 23,
The electric wire 2 with the core wire 2B exposed at the tip is pushed in. When the boundary between the covering portion 2A and the core wire 2B is inserted into the small-diameter pipe 24, the root portion of the small-diameter pipe 24 (where it is close to the connection portion with the large-diameter pipe 23) is slightly crushed, so that the electric wire 2 and the small-diameter The inner wall of the pipe 24 is electrically connected.

Here, the sealing material 11 is poured from the opening 23A of the large diameter pipe 23. With this sealing material 11,
The connection between the core wire 2B and the small diameter pipe 24 is waterproofed.
At this time, since the electric wire 2 is attached to the small-diameter pipe 24 in a closely inserted state, the sealing material 11 does not flow into the small-diameter pipe 24 side. After pouring the sealing material 11 to the inlet of the large-diameter pipe 23 and solidifying it, the assembly of the ground terminal 20 is completed.

As described above, the second embodiment has the following effects in addition to the effects of the first embodiment. Since the ground terminals 20 are provided by the two pipes 23 and 24 having different diameters, there is no need to form a mold as in the case of casting, and the ground terminals 20 can be manufactured at low cost.

The present invention is not limited to the above-described embodiment. For example, the following ones are also included in the technical scope of the present invention. (1) In order to improve the contact state between the electric wire connection portion and each electric wire core wire, the inside of the electric wire connection portion may be tapered (mortar shape). (2) In order to prevent the sealing material from leaking to the contact portion between the electric wire and the ground terminal, the electric wire may be bound by a band for sealing.

[Brief description of the drawings]

FIG. 1 is a perspective view of a ground terminal according to a first embodiment.

FIG. 2 is a side sectional view of a ground terminal.

FIG. 3 is a side sectional view when an electric wire is connected to a ground terminal.

FIG. 4 is a perspective view showing a ground terminal material and a sealing material in a second embodiment.

FIG. 5 is a perspective view when a sealing material is inserted into a small diameter portion.

FIG. 6 is a perspective view when a wire is connected to a ground terminal after completion.

FIG. 7 is a side sectional view when an electric wire is connected to a ground terminal.

FIG. 8 is a side sectional view showing a conventional ground terminal.

[Explanation of symbols]

 1, 20 ground terminal 2 electric wire 2B core wire 3 large diameter portion 3A, 23A opening 4 small diameter portion 5, 26 earth part 9, 27 electric wire connection part 11 sealing material 21 earth terminal material 22 Waterproofing member 23: Large diameter pipe 24: Small diameter pipe

Claims (3)

[Claims] 1. A ground terminal comprising a ground portion connected to a ground plane and a wire connection portion connecting a plurality of wires, wherein the entire wire connection portion is formed in a bottomed cylindrical shape and has a bottom portion. On the other hand, a small-diameter portion for accommodating the core portion exposed at the end of each electric wire in a substantially tightly inserted state and in contact with the inside and connecting to the ground portion is formed, while a seal is provided on the opening side of the electric wire connection portion. A ground terminal having a large diameter portion for filling a material. 2. The ground terminal according to claim 1, wherein the respective core portions exposed at the tips of the plurality of electric wires are housed in the small-diameter portion in a state of being almost closely inserted and in contact with the inside, and An earth structure wherein the earth portion is connected to a ground surface in a state where a large diameter portion is filled with a sealing material. 3. A ground terminal material formed by connecting pipes having different diameters in the longitudinal direction, and the tip of the smaller diameter pipe is crushed to form the ground portion. 2. The method for manufacturing a ground terminal according to claim 1, wherein a waterproof member is interposed in the ground terminal.