JP2001177938A - Waterproofing treatment device for covered cable terminal joint part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproofing treatment device for a covered cable terminal joint part, capable of ensuring for either the cases where the cable is a combined line constituted of a plurality of lines or is formed out of a plurality of lines having different diameters, sealability between a die for cover molding and it, in applying waterproof treatment to the terminal joint part o the cable by performing cover molding with molten resin. SOLUTION: Elastic blocking plates 53, 63, 73, 83, attached to the front ends of blocking mechanisms 50, 60, 70, 80 disposed radically at one side opening part of the mold part of a molding die 40 which opens to lead out a cable 10 to the outside of the mold part, are brought by integrally-moving the respective mechanisms in the centripetal direction, into pressure contact from all directions with the entire periphery of the cable 10 for elastic catching. A accordingly, molten resin leakage out of the die from the mold part can be prevented and even if the cable 10 comprises lines 10A, 10B having different diameters, bring intimate contact without clearances, with these respective lines, thereby ensuring high sealability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for waterproofing a terminal portion of a covered electric wire which has been waterproofed by resin molding.

[0002]

2. Description of the Related Art In general, in the case of a covered electric wire, its end is peeled off to expose a conductor, and it is connected to an electric component or device through a terminal fitting which is crimped to the bare conductor and crimped. If the bare wire conductor after crimping is left as it is, moisture is transmitted and penetrates, and there is a disadvantage that the bare wire conductor penetrates into the covered electric wire by a capillary phenomenon. In order to prevent this, the terminal connection portion including the bare wire conductor is protected by various covering means and waterproofed.

[0003] For example, a ground terminal fitting described in Japanese Patent Application Laid-Open No. 10-289745 is waterproofed by covering a bare wire conductor at a terminal connecting portion with a heat-shrinkable tube and heat-welding it. Further, as in a connection plate for a battery holder described in Japanese Patent Application Laid-Open No. H11-120986, in a wiring to a power supply battery of an electric vehicle, a terminal connection portion obtained by crimping a terminal fitting to a bare conductor is covered with a molding resin. The technique of performing a waterproofing process is also well known.

FIGS. 4 (a) and 4 (b) are sectional views of a mold constituting a main part of the apparatus and a line Y-Y in order to conceptually explain the latter mold resin waterproofing apparatus. It is principal part sectional drawing of.

A molding die 1 comprises an upper die 2 and a lower die 3 and the like. A molding part 4 which is a molding cavity is provided in an inner fitting part of the upper and lower dies 2 and 3. A molten mold resin indicated by an arrow 6 is injected and injected from the runner 5. A bare wire conductor 7a obtained by peeling the end of the covered electric wire 7 as a molded work
A crimped portion 8a, 8b of the terminal fitting 8 is crimped to prepare a terminal connection portion which is crimped, and is positioned and set in the mold portion 4 in the mold except for the connection portion 8c at the tip of the terminal fitting 8.

[0006] The coated electric wire 7 extending rearward from the terminal fitting 8 at the terminal connecting portion does not require coating protection by resin molding, and is taken out of the molding die 1. For this purpose, one side of the mold part 4 is opened, from which the covered electric wire 7 is taken out of the mold. Therefore, it is necessary to close the opening on one side of the mold section 4 to prevent the mold resin 6 from flowing out, and to hold the coated electric wire 7 on the part protruding from the opening on the one side, and to sufficiently hold it. It is necessary to prevent the resin from leaking from the outer peripheral surface of the electric wire by ensuring the sealing property. In order to provide both functions of closing the mold portion and holding the electric wire, one side opening is closed by an elastic closing plate 9 made of rubber or the like. The elastic closing plate 9 is of a vertically divided type composed of an upper mold portion 9a and a lower mold portion 9b, and elastically sandwiches and closes the covered electric wire 7 at a protruding portion to prevent resin leakage. .

[0007]

However, the conventional molding die 1 provided with the elastic closing plate 9 shown in FIGS. 4A and 4B has the following problems to be solved. .

The insulated wire 7 may be not only a single wire but also a braided wire composed of a plurality of wires having the same or different wire diameters. As shown in the illustrated example, two wires 7a, 7a,
In the case of the coated electric wire 7 made of 7b, it is necessary to simultaneously hold the two electric wires 7a and 7b in close contact with the elastic closing plate 9 from above and below. However, two electric wires 7
Because the wire diameters of the wires a and 7b differ from each other, both wires 7a and 7b
4b, it is difficult to bring the elastic blocking plates 9a, 9b into close contact with each other from above and below.
A gap c occurs as shown in FIG. For this reason, there is an inconvenience that a required sealing property cannot be secured against resin leakage.

As the elastic closing plates 9a and 9b, it is possible to prepare the elastic blocking plates 9a and 9b which are formed into a shape that can be closely adhered between the two electric wires 7a and 7b having large and small diameters as in the above example. It is uneconomical in terms of cost and storage to manufacture and prepare several types of elastic closing plates having a shape that can correspond to the number and combination of different-diameter electric wires.

Accordingly, an object of the present invention is an apparatus for waterproofing by coating a terminal connection portion obtained by crimping a terminal fitting on a bare wire conductor at the end of a covered electric wire by resin molding by molding. Even if it is composed of multiple wires or multiple wires of different diameters, it is possible to freely seal and secure the sealing property with the mold side so that it can be removed from the mold part of the in-mold cavity. An object of the present invention is to provide a prevention treatment device that can effectively prevent leakage of a molten resin.

[0011]

In order to achieve the above-mentioned object, a waterproofing device for a terminal portion of a coated electric wire according to the present invention is characterized in that a terminal fitting is crimped to a conductor at the tip of the coated electric wire. When the terminal connection part is set in the mold part of the molding die, and the molten resin injected and injected into this mold part is coated on the terminal connection part and waterproofed, the covered electric wire behind the terminal connection part is molded. One side of the mold part is an opening to pull out the outside of the part, and the part of the covered electric wire coming out of the opening is elastically sandwiched and adhered by an elastic blocking plate to close the opening and melt. A plurality of closing mechanisms radially arranged at the opening of the mold section are provided with elastic closing plates at their distal ends, so that the closing mechanism is integrally formed with the closing mechanism. Depending on the operation Each elastic closing plate is characterized by being resiliently clipping in close contact without a gap on the outer periphery of the time of setting out portion of the covered wire to move in the centripetal direction.

With the above arrangement, the covered electric wire extending rearward of the terminal connecting portion which does not require waterproofing is drawn out from one side opening of the molding part of the molding die, and the one side opening is closed. A plurality of radially arranged closing mechanisms are simultaneously moved in the centripetal direction with respect to the covered electric wire of the drawer portion, so that the elastic closing plates at their tips are brought into close contact and elastically sandwiched. The plurality of elastic closing plates are tightly adhered to the entire outer periphery of the covered electric wire from all directions in the radial direction without any gap, thereby preventing the molten resin from leaking from the molded portion.

Further, in the waterproofing device for a terminal portion of a covered electric wire according to the present invention, when the covered electric wire is composed of a plurality of electric wires having the same diameter or different diameters, the plurality of electric wires having any diameter can be used. Correspondingly, the elastic closing plate cooperates and closely adheres to the outer periphery.

According to the above configuration, the coated electric wire is not limited to a single wire, but in the case of a plurality of electric wires having the same kind of diameter or a wire composed of different kinds of diameters, in any case, the outer periphery of all of the plurality of wires is used. By making the elastic closing plate adhere to the elastic closing plate without any gap, the molten resin can be effectively prevented from leaking from the opening on one side of the mold portion.

According to a third aspect of the present invention, in the waterproofing device for a terminal portion for connecting a covered electric wire, the elastic holding surface of the elastic closing plate is formed into a biting shape for enhancing the adhesion to the outer periphery of the electric wire. Features.

With the above configuration, especially when the covered electric wire is a braid composed of a plurality of electric wires, the elastic clamping surface of the elastic closing plate is formed into a biting shape such as a saw blade shape or a corrugated shape. The degree of adhesion to the outer periphery is increased, and the sealing performance against leakage of the molten resin is ensured.

According to a fourth aspect of the present invention, in the waterproofing device for a terminal portion of a covered electric wire, the elastic closing plate is moved forward in the centripetal direction and retracted in the centrifugal direction in conjunction with the operation of the molding die 40. It is characterized in that it is configured to be.

According to the above configuration, when the terminal connection portion, which is a molded work, is set in the mold portion of the mold, and then the molten resin is injected and injected into the mold portion.
In conjunction with the operation of the molding die, the operation of closing the molded part and the operation of elastically holding the covered electric wire drawn out from the molded part and securing the sealing performance are performed in a series of molding operations. Will be

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a waterproofing device for a terminal of a coated electric wire according to the present invention.

FIG. 1 is a perspective view showing a terminal connecting portion before waterproof treatment in which a terminal fitting 20 is crimped on a bare wire conductor 11 which is exposed by peeling off the end portion of a covered electric wire 10. As shown in FIGS. 2A and 2B, the insulated wire 10 is as follows.
An example is shown in which two wires 10A and 10B having different wire diameters are combined.

The terminal fitting 20 has a flat connecting portion 21 at the tip end, and as shown in FIG. For example, a bolt 3 is inserted through the opening 22 so that it can be connected to the vehicle body 4 as a ground wire. Also, the rear part of the connection part 21 is crimped parts 23 and 24 which are crimped and crimped to the bare conductor 11.

FIGS. 2 (a) and 2 (b) show a molding die 40 of a main part of a device for setting and waterproofing the terminal connection portion.
And its structure is the molding die 1 shown in FIG.
Is basically the same as The molding die 40 is composed of upper and lower dies and the like, and a molding portion which is a molding cavity is provided in an inner fitting portion of the upper and lower dies. It has become. The terminal connecting portion, which is a molding work, is set by being positioned in the mold portion except for the connecting portion 21 at the tip of the terminal fitting 20.

In the terminal connection part, the covered electric wire 10 extending rearward from the terminal fitting 20 is drawn out of the molding die 40 because it does not require waterproof treatment by resin coating molding. For this purpose, one side of the molded part is opened, from which the covered electric wire 10 is taken out of the mold.

Therefore, as shown in FIG. 2 (a), in the opening from which the coated electric wire 10 is drawn out on one side of the molding section, four closing mechanisms 50, each of which is a set of two upper and lower stages, are used.
60, 70, 80 are arranged radially. These four
The base closing mechanisms 50, 60, 70, and 80 are configured to integrally move forward in the centripetal direction toward the center and to retract in the centrifugal direction, thereby closing the opening by the forward movement.

The closing mechanism 50, 60, 70, 80
The rods 51, which move in and out of the guide holes 54, 64, 74, 84 in conjunction with the upper and lower mold operating mechanisms of the molding die 40,
61, 71 and 81 are provided. These rods 51,
Numerals 61, 71 and 81 are capable of reciprocating in a centripetal direction from the radially arranged position toward the center and in a centrifugal direction returning to the radial original position.
2, 62, 72, 82, elastic blocking plates 53 made of rubber material,
63, 73, and 83 are provided by joining.

With the above arrangement, after the terminal connecting portion of the molding work is positioned and set in the molding portion in the molding die 40, the closing mechanisms 50, 60, 7 are interlocked with the operation of the upper and lower dies.
0,80 operate simultaneously.

As shown in FIG. 2B, the rods 51, 61,
When the members 71 and 81 are integrally advanced in the centripetal direction, the elastic closing plates 53, 63, 73 and 83 at the tip ends of the rods are omnidirectionally extended over the entire outer periphery of the electric wires 10A and 10B when they are pulled out of the in-mold portion. And press tightly without any gap to elastically clamp.

As described above, the elastic closing plates 53, 63, 7
3, 83 move in the centripetal direction from all directions arranged radially, so that the covered electric wire 10 is not limited to the case of the electric wires 10A, 10B of two different diameters as in the present example, but other forms. The insulated wire 10 can be freely adhered to the outer peripheral surface of the wire without any gap. Thereby, it is possible to effectively prevent the molten resin from leaking when the covered electric wire 10 pulled out from the mold portion, and to secure required sealing properties.

The elastic closing plates 53, 63, 73, 83
As shown in FIG. 2 (a), the elastic holding surface at the tip is processed into a wave shape, a saw blade shape, or the like, so that electric wires 10 of different diameters are formed.
The biting properties of the outer peripheral surfaces of A and 10B are improved, the degree of adhesion is increased, and an effective sealing property can be secured.

The closing mechanism 50, 60, 7 described above
The configuration of 0,80 shows only one embodiment, and is not limited thereto.

That is, in this example, each of the rods 51, 6
1, 71, 81 are linked to the operation of the upper and lower molds of the molding die 40, but each rod 51, 61, 71, 81 is a different rod operating mechanism such as a booster mechanism using spring force or leverage force. It is also possible to operate with.

Further, in this embodiment, a pair of closing mechanisms 50 and 60 are arranged on the upper stage to interlock with the operation of the upper die, and a pair of closing mechanisms 70 and 60 are arranged on the lower stage to interlock with the operation of the lower die. 8
0 is arranged. Also in this case, the number of arrangements is not limited to the upper and lower stages, and the number of arrangements is not limited to four, and the appropriate number of closing mechanisms are arranged on the left and right sides according to the form of the covered electric wire 10. The structure may be used.

The point is that the elastic closing plates 53, 63, 73, 83
Based on the technical idea of the present invention in which a plurality are radially arranged and moved in the centripetal direction as described above, various applications are possible for the number of elastic closing plates and the operating mechanism.

FIG. 3 is a partial cross-sectional view showing an embodiment in which a terminal connection portion coated and molded with a mold resin 30 and subjected to a waterproofing process is used as a ground wire for an automobile body 4 or the like with a bolt 3, for example.

[0035]

As described above, according to the present invention, the waterproofing device for a coated wire terminal connecting portion according to the first aspect of the present invention comprises:
The covered electric wire extending to the rear of the terminal connection part is drawn out from one side opening of the molding part of the molding die. By simultaneously moving the elastic closing plates disposed in the centripetal direction, the elastic closing plates at their ends are pressed and brought into close contact with each other. By a plurality of elastic closing plates closely contacting the entire outer periphery of the covered electric wire without any gap,
The required sealing property can be ensured by preventing the molten resin from leaking from the mold portion.

In addition, in the waterproofing device for a terminal portion of a covered electric wire according to the present invention, the covered electric wire is not limited to a single wire, and a plurality of electric wires having the same kind of diameter or wires having different diameters can be used. In any case, the entire periphery of all of these multiple wires is tightly closed by an elastic closing plate when the closing mechanism is operated in the centripetal direction, preventing leakage of molten resin from one side opening of the mold section. Required sealing performance can be secured.

[0037] In the waterproofing device for a covered wire terminal connecting portion according to the third aspect of the present invention, the holding surface of the elastic closing plate may be formed, for example, in the form of a saw blade or the like, particularly when the covered wire is a braid composed of a plurality of wires. By forming it in a corrugated shape, the degree of adhesion of the elastic closing plates that are in close contact with the outer periphery of each electric wire is increased, and the sealing performance against leakage of the molten resin is ensured.

In addition, in the waterproofing device for a coated electric wire terminal connecting portion according to a fourth aspect of the present invention, the molten resin is injected into the mold portion after the terminal connecting portion, which is a molded work, is set in the mold portion in the mold. The operation of closing the mold part in conjunction with the operation of the molding die during injection, and the operation of elastically holding the covered electric wire drawn out from the mold part and securing the sealing performance are a series of molding work. The molding efficiency is increased.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing a state before waterproofing treatment with a mold resin as an embodiment of a terminal connection portion of a covered electric wire according to the present invention.

FIG. 2 (a) is a view showing a state in which a terminal connecting portion, which is a molding work, is set in a molding portion of a molding die constituting a main portion of the device, and a plurality of coated electric wires drawn out of the mold are radially extended. It is sectional drawing which shows the state before the operation | movement in the case of ensuring sealing property by making an elastic closing plate adhere | attach, and the same figure (b) is sectional drawing which shows the aspect which elastically clamped the covered electric wire in the state of adhesion by those elastic closing plates. .

FIG. 3 is a partial cross-sectional side view showing a state where the terminal connection portion after the waterproofing process is attached to an automobile body or the like and used as a ground wire.

FIG. 4 (a) is a diagram illustrating a conventional example of a molding die; FIG. 4 (a) shows an example in which a terminal connecting portion, which is a molding work, is set in a molding portion of the molding die, and the coated electric wire is drawn out of the die; FIG. 4B is a side cross-sectional view showing a state in which a gap is formed between the covered electric wire and the elastic closing plate, and FIG. It is.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Insulated electric wire 10A, 10B Electric wires of different diameters 11 Bare wire conductor 20 Terminal fitting 21 Connection part 23, 24 Caulking part 30 Mold resin 40 Mold 50, 60, 70, 80 Closing mechanism 51, 61, 71, 81 Rod 53, 63, 73, 83 Elastic closing plate

Claims (4)

[Claims] 1. A terminal connecting part in which a terminal fitting is crimped to a conductor at the tip of a covered electric wire is set in a molding part of a molding die,
In the case where the molten resin injected and injected into the mold portion is coated and molded on the terminal connection portion to perform waterproofing, one side of the mold portion has an opening to draw out the covered electric wire behind the terminal connection portion to the outside of the mold portion. The waterproofing treatment is to prevent the molten resin from leaking out of the mold by closing the opening by preventing the covered wire from coming out of the opening by elastically sandwiching and tightly contacting it with the elastic closing plate. The device, wherein a plurality of closing mechanisms radially arranged at the opening of the mold section are provided with elastic closing plates at their distal ends, and each elastic closing plate moves in the centripetal direction by the integral operation of the closing mechanism. A waterproof treatment device for a terminal portion of a covered electric wire, wherein the waterproof treatment device is provided so as to be tightly and elastically held tightly on the outer periphery of a portion where the covered electric wire comes out. 2. When the covered electric wire is composed of a plurality of electric wires having the same diameter or different diameters, the elastic closing plate cooperates on the outer periphery corresponding to the plurality of electric wires having any diameter. The waterproofing device for a coated wire terminal connecting portion according to claim 1, wherein the waterproofing device is in close contact. 3. The insulated wire terminal connecting portion according to claim 1, wherein the elastic holding surface of the elastic closing plate is processed into a biting shape for enhancing adhesion to an outer periphery of the electric wire. Waterproof processing equipment. 4. The elastic closing plate according to claim 1, wherein an advancing operation in a centripetal direction and a retreating operation in a centrifugal direction of the elastic closing plate are interlocked with the operation of the molding die. A waterproofing treatment device for a terminal of a covered electric wire described in the above.