JPH06150985A - Terminal treatment apparatus of electric wire - Google Patents

Abstract

PURPOSE: To provide a terminal processing device for a power cable that can obtain stable and reliable waterproof insulation protective functions without causing problems to increase the size of a metal mold and allow rubber component to enter the terminal. CONSTITUTION: A terminal processing device 10 has a terminal 12 and a terminal insulation coating 14. The terminal 12 has a pressure contact part 18 extending in a bag-shaped form from a connecting part 16 to the outside, a supporting part 20 extending at a specified length in the opposite side of the connecting part 16 from the pressure contact part 18, and a projecting edge 22 formed as a ring-shaped projection between the pressure contact part 18 and the supporting part 20. The terminal insulation coating 14 has a coating member 24 consisting of rubber material that has both high-elastic recovery rate and superior permanent elongation characteristics and a plastic core 26 to elastically expand a part of the coating member 24. The coating member 24 is fitted to the supporting part 20 of the terminal while it airtightly surrounds the supporting part 20 by the aid of the shrinking force of the coating member 24 by removing the core member 26 at an end 30 of the coating member 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a coated electric wire (cable,
The present invention relates to an electric wire end treatment device for moisture-proofing and insulating coating a connecting portion between a terminal and a cable in a terminal treatment part (hereinafter referred to as a cable).

[0002]

2. Description of the Related Art Conventionally, a terminal portion of a cable has various electric wire terminal treatment devices (hereinafter, simply referred to as a terminal treatment device) for moisture-proofing, insulating coating, and mechanically protecting a connection portion between a terminal and a cable. ) Has been processed by. For example, a terminal processing device using a shrinkable tube structure as proposed in Japanese Patent Application No. 58-15355 is known. As shown in FIG. 5, this terminal treatment device includes a shrinkable tube type terminal insulating jacket 1. The terminal insulating jacket 1 is made of a rubber material having excellent permanent elongation characteristics, and is elastically expanded by a cylindrical plastic core (not shown) before use. The cable 3 in which the cable insulator 2 is exposed at the end portion is inserted into the terminal insulation jacket 1 in this state, and the electric wire at the end of the cable is inserted into the pressure contact portion 5 of the terminal 4. Then, by pulling out the plastic core of the terminal insulating jacket 1, the terminal insulating jacket 1 contracts, and the cable insulator 2, the cable 3, and the pressure contact portion 5 of the terminal 4 are tightly tightened and fixed to each other. The terminal 4 is connected to the electric wire at the end of the cable by crimping the press contact portion 5 with a hydraulic tool. Therefore, in order to assist the adhesion between the deformed pressure contact portion 5 and the terminal insulating jacket 1, and to secure the watertightness and the electric insulation of the terminal portion, it is necessary to cover both fastening portions with the waterproof tape 6. There is. This terminal processing device has the advantage that it can be used regardless of the type of terminal,
There is a large number of work steps and the number of parts required for the work, and there is a risk that the relative positioning of the terminal insulation jacket and the terminal may vary, and the waterproof tape treatment tends to vary among workers, so stable water tightness Has the problem that it is difficult to obtain the electrical conductivity and the electrical insulation.

In order to reduce the number of work steps and the number of parts, and to eliminate the need for relative positioning between the terminal insulation jacket and the terminal and the need for waterproof tape treatment, the terminal insulation jacket and the terminal are integrally molded by a rubber molding die. A terminal processing device to be used is already provided. As shown in FIG. 6, this terminal treatment device has a terminal insulating jacket 7 made of insulating rubber and a terminal insulating jacket 7 made of an insulating rubber, which is attached to the cable insulator 2 exposed at the end portion of the cable 3 in a plug-in manner. And a terminal 8 formed by insert molding. The cable 3 and the terminal 8 are connected by caulking the pressure contact portion 9 of the terminal 8. According to this terminal processing device, since the terminal 8 is integrally formed with the terminal insulating jacket 7, stable and sufficient watertightness and electrical insulation are imparted to the terminal portion. However, the rubber molding die required for manufacturing is inevitably increased in size by the size of the terminal, and as a result,
There is a problem that a large capacity press machine is required. Also,
In the insert molding step, the insulating rubber component may enter the terminal, resulting in poor conduction. further,
When a defect occurs after the terminal treatment, it is practically impossible to remove the terminal or the terminal insulating jacket alone, because the member is deformed and deteriorated, which is extremely disadvantageous in terms of cost.

[0004]

As described above, in the conventional shrinkable tube type end treatment device, the terminal and the terminal insulating jacket are supplied separately, so that the terminal and the terminal insulating jacket are separated when a defect occurs. Although they can be handled separately, there is no disadvantage in terms of cost, but there are problems that the number of work steps and the number of parts are large, and that a stable waterproof insulation protection function cannot be obtained. In addition, the conventional integrated molding type end treatment device,
Although the number of work steps and the number of parts are small and a stable waterproof insulation protection function can be obtained, as described above, there are problems in the manufacturing process and problems in maintenance.

An object of the present invention is to provide a power cable terminal treatment device which can obtain a stable waterproof insulation protection function without causing the above problems in the manufacturing process and maintenance.

[0006]

In order to achieve the above object, the present invention provides a terminal made of an electrically conductive material and an electric wire made of an electrically insulating material and exposed at the end of a cable, and the electric wire and the terminal. In a terminal treatment device comprising a terminal insulating jacket element for moisture-proofing and insulation-coating a connecting portion, and forming a terminal portion at the end of a cable, the terminal includes a connecting portion connected to an external good electric conductor and a connecting portion. It is provided with a press-contact portion that extends in a hollow shape and is compression-connected to the exposed electric wire, and a support portion that extends from the press-contact portion to a predetermined length and that fixedly supports the terminal insulating jacket element. The element to be supported is a substantially cylindrical element made of a rubber material having a high elastic recovery rate, and is supported by at least one end surrounding the supporting portion of the terminal in a watertight manner by the contracting force after being elastically expanded. End characterized by being fastened to the part To provide a processing apparatus.

According to a preferred embodiment, the terminal insulation jacket element is a substantially cylindrical jacket member made of a rubber material having excellent permanent elongation characteristics, and disposed inside the jacket member. A core member that holds a part of the core member in an expanded state of a predetermined diameter dimension, the jacket member is fastened to the support part of the terminal at one end where the core member is not arranged, and the remaining part is expanded. The structure can be maintained.

Further, the terminal is provided between the pressure contact portion and the support portion,
It is expedient to have a tongue against which one end of the terminal insulation jacket element abuts. The projecting edge portion is preferably formed in an annular shape, and may have a shape in which the diameter gradually increases from the support portion side of the terminal to the press contact portion side and projects. The protruding edge portion can be integrally formed with the terminal by casting or forging, but instead, the protruding edge portion may be formed separately from the terminal and fixed to the terminal by welding, screw, adhesive or the like. Further, the projecting edge portion can be formed of the same good electric conductor as the terminal such as metal, but may be formed of ceramic or an insulating resin such as epoxy resin instead.

[0009]

Since the supporting portion of the terminal is extended from the press contact portion to a predetermined length, the terminal insulating jacket element can be supported without being deformed even when the terminal and the electric wire are connected. Since the terminal insulation jacket element is fixed to the support part of the terminal by the contraction force after elastic expansion of itself, it can be molded as a separate member from the terminal, and further, the support part is surrounded at least in a watertight manner. Therefore, it is possible to obtain a stable and sufficient waterproof and insulation protection function without using auxiliary means such as a waterproof tape for the fastening portions of both. Further, the terminal and the terminal insulating jacket element can be stored and transported in a state where they are firmly combined together, thereby reducing the number of on-site work steps and the number of parts. When a defect occurs in the terminal portion, the terminal and the terminal insulating jacket element can be separated from each other, thereby avoiding a cost disadvantage.

Further, when the terminal insulating jacket element is composed of a substantially cylindrical jacket member and a core member which holds a portion of the jacket member other than a portion fastened to the terminal in an expanded state, the terminal insulating jacket element is formed. The cable can be inserted into the jacket element with zero load. Next, after connecting the cable and the terminal, the core member is removed, so that the jacket member moisture-proofs and insulates the electric wire exposed at the end of the cable and the connecting portion between the electric wire and the terminal.

Further, when the projecting edge portion is provided between the pressure contact portion of the terminal and the supporting portion, one end portion of the terminal insulating jacket element is brought into contact with the projecting edge portion, so that the terminal insulating jacket element is stably positioned. Can be easily obtained. In addition, the projecting edge portion effectively prevents water droplets and water from entering the inside of the terminal insulating jacket element along the outer surface of the pressure contact portion of the terminal. To improve the closeness of contact between the terminal insulation jacket element and the surface of the projecting edge by forming the projecting edge in an annular shape and gradually increasing the diameter and projecting from the support section side to the pressure contact section side. You can

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in more detail with reference to the preferred embodiments shown in the accompanying drawings. In each drawing, the same or similar components are designated by common reference numerals. Referring to FIG. 1, a terminal processing device 1 according to an embodiment of the present invention.
Reference numeral 0 includes a terminal 12 made of a metal material having good electrical conductivity, and a shrinkable tube type terminal insulating jacket 14 made of an electric insulating material. The terminal insulation jacket 14 moisture-proofs and insulates the electric wire exposed at the end of the cable subjected to the terminal treatment and the connecting portion between the electric wire and the terminal 12.

The terminal 12 includes a plate-shaped connecting portion 16 connected to an external electric conductor (not shown), a pressure contact portion 18 extending from the connection portion 16 in a hollow bag shape, and a pressure contact portion 18. On the opposite side of the connecting portion 16, there is provided a cylindrical support portion 20 extending to a predetermined length, and a projecting edge portion 22 projecting in an annular shape between the pressure contact portion 18 and the support portion 20. It is formed as a molded product. As shown in the figure, the projecting edge portion 22 is formed by gradually expanding the diameter from the support portion 20 side to the pressure contact portion 18 side. The projecting edge portion 22 can be integrally formed with the terminal 12 by casting or forging, but instead, is formed separately from the terminal 12,
You may fix to the terminal 12 by welding, a screw, an adhesive agent, etc. Further, the protruding portion 22 can be formed of the same metal material as the terminal 12, but instead of the ceramic,
Alternatively, it may be formed of an insulating resin such as an epoxy resin.

The terminal insulating jacket 14 is a substantially cylindrical jacket member 24 made of a rubber material having a high elastic recovery rate and excellent permanent elongation characteristics, and a part of the jacket member 24 is elastically expanded to a predetermined length. And a core member 26 made of plastic that holds the expanded diameter. The core member 26 of the terminal insulation jacket 14 has a spiral cut 28,
A strip-shaped extension 32 on the side corresponding to one end 30 of the
Are extended (see FIG. 2). The tip of the extension 32 passes through the inside of the core member 26 and is arranged at the opposite end.

In order to form the terminal insulating jacket 14, first, a core member 26 having a length capable of elastically expanding the entire length of the jacket member 24 is provided, and one end of the core member 26 extending the extension 32 is a terminal. The support portion 2 is formed so as to surround the entire 12 support portions 20.
It is temporarily fixed to 0, and in this state, the outer cover member 24 having the entire length expanded in advance is arranged around the core member 26. Then
When the extension portion 32 of the core member 26 is pulled as shown by an arrow A in FIG. 1 and the core member 26 is unwound in a spiral shape along the notch 28, one end portion 30 of the jacket member 24 is restored and contracted,
The contracting force surrounds the support portion 20 of the terminal 12 in an airtight manner and tightens the support portion 20. At this time, the one end portion 30 of the outer cover member 24 is brought into contact with the projecting edge portion 22 of the terminal 12, whereby the terminal insulating outer cover 14 is positioned at a predetermined position with respect to the terminal 12. Further, the one end portion 30 of the outer cover member 24 comes into close contact with the tapered outer surface of the projecting edge portion 22 by the contracting force. The core member 26 maintains the diameter of the remaining portion of the jacket member 24 in an expanded state.

Alternatively, the terminal insulation jacket 14 is provided on the terminal 12 such that the one end 30 of the jacket member 24 whose entire length is held in an expanded state by the core member 26 in advance surrounds the support portion 20 of the terminal 12. The end 30 in that state.
Alternatively, the core member 26 corresponding to can be unwound to be fastened to the support portion 20 to be formed.

The outer cover member 24 of the terminal insulating outer cover 14 is composed of 30
It is made of a rubber material having a permanent elongation of not more than%. Suitable rubber materials include ethylene propylene rubber, chloroprene rubber, butyl rubber, silicone rubber and the like. Also,
The magnitude of the contracting force of the outer cover member 24 is displayed by so-called seal stress (%), but in the present invention, by designing the seal stress to be 5% or more, the supporting portion 20 is made airtight. Sufficient contraction force to enclose is obtained. At the same time, by setting the length of the support portion 20 of the terminal 12 to 5 mm or more, a seal length sufficient to support the one end portion 30 of the jacket member 24 in an airtight manner can be obtained. In this example, the seal stress is expressed by the following equation. Seal stress = [(outer diameter of support portion 20 of terminal 12-inner diameter of outer cover member 24 when not expanded) / outer cover member 2 when not expanded
4 inner diameter)] × 100

The terminal processing apparatus 10 having the above structure can store and transport the terminal 12 and the terminal insulating jacket 14 in a state where they are firmly and integrally combined as shown in FIG. Further, since the one end portion 30 of the outer cover member 24 of the terminal insulating outer cover 14 surrounds the support portion 20 of the terminal 12 in an airtight manner, it is not necessary to use an auxiliary means such as a waterproof tape for the fastening portion of both. Therefore, compared with the conventional terminal processing device including a separate terminal and terminal insulation jacket, the number of work steps and the number of parts at the site can be reduced, and a stable and sufficient waterproof and insulation protection function can be obtained. . Furthermore, the terminal 12
Since the terminal insulation jacket 14 and the terminal insulation jacket 14 are molded in separate steps, the problem of the molding die of the conventional terminal processing apparatus that insert-molds the terminal into the terminal insulation jacket and the problem of rubber component entering the terminal. Does not occur.

A procedure for mounting the terminal processing device 10 on the terminal portion of the cable will be described below with reference to FIG. As shown in FIG. 2, in the end portion of the cable 34 to be terminated, the tubular cable insulator 36 is exposed by the pretreatment, and the electric wire 38 is exposed at the tip of the cable insulator 36. This cable 34 is applied to the terminal treatment device 10 in the pre-use state of FIG. 1 so that the expanded diameter portion of the terminal insulating jacket 14 covers the electric wire 38 at the tip to a part of the cable jacket of the cable 34. insert. The electric wire 38 further extending from the cable insulator 36 is inserted into the support portion 20 and the pressure contact portion 18 of the terminal 12, and the pressure contact portion 18 is caulked with a hydraulic tool to electrically and mechanically connect to the terminal 12. Connected. At this time, since only the press contact portion 18 of the terminal 12 is deformed and the support portion 20 is not deformed, the connection between the terminal 12 and the terminal insulating jacket 14 is reliably maintained. next,
The extension 32 of the core member 26 of the terminal insulating jacket 14 is pulled in the direction of arrow B in FIG.
When 6 is further unwound, the jacket member 24 gradually restores and contracts from the one end 30 side, and the contracting force gradually surrounds the cable insulator 36 to the non-exposed portion of the cable 34 in an airtight manner. . When the core member 26 is completely removed, as shown in FIG. 3, the end portion of the cable 34 is surely formed with a waterproof and insulation-protected terminal portion.

The effect of waterproof insulation protection of the cable end portion by the above-mentioned terminal processing device 10 will be further clarified by the following experiment. The terminal processing device 10 to be tested is 6.6k.
A contraction tube made of ethylene propylene rubber (corresponding to the covering member 24) and a spiral core made of polypropylene (corresponding to the core member 26) are used as the terminal insulating jacket 14 so that it can be applied to a CV cable of V, 60 mm ^2. Using a silicon insulation coating material for QT-II terminals (manufactured by Sumitomo 3M, product number 5641) having and, the terminal insulation jacket 14 is connected to the terminal 12 by removing the spiral core at one end. Composed. Further, the length of the supporting portion 20 of the terminal 12 is 30 mm, and the terminal insulating jacket 14
The seal stress of the outer cover member 24 is designed to be about 40%.

With respect to each of the terminal processing device 10 having the above structure, the shrinkable tube type terminal processing device and the integrally molded type terminal processing device according to the above-mentioned prior art, air pressure is applied from the end opposite to the end of the cable. Was applied to measure the pressure at the time of an air leak at the fastening portion between the terminal and the terminal insulation jacket, and the airtight characteristics of the respective devices were comparatively evaluated. The evaluation results are shown in Table 1 below.

[0022]

[Table 1] As can be seen from Table 1, the terminal processing device 10 according to the above-described embodiment can obtain substantially the same airtight characteristic as the integrally molded terminal processing device according to the related art.

The terminal treatment device 10 according to the above-described embodiment includes a shrink tube type terminal insulating jacket 14 which is fastened to the terminal 12.
However, the present invention is not limited to this configuration, and a known plug-in type jacket element can be used as the terminal insulating jacket 14, for example. FIG. 4 shows a terminal processing device 40 having such a configuration.

In the terminal treatment device 40, a terminal insulating jacket 42 made of insulating rubber is attached to the cable insulator 36 exposed at the end portion of the cable 34 in an insertable manner, and one end 44 of the terminal insulating jacket 42. And a terminal 12 fastened to the.
The terminal insulation jacket 42 is composed only of a jacket member having both a high elastic recovery rate and excellent permanent elongation characteristics, and is supported by the support portion of the terminal 12 by the restoring contraction force after mechanically elastically expanding one end of the jacket member. 20 is airtightly surrounded and fastened to the support portion 20. The material and the required characteristics of the terminal insulation jacket 42 are determined by the jacket member 2 of the terminal insulation jacket 14 of the terminal processing apparatus 10.
The same as 4. In the figure, reference numeral 44 indicates a rain cover.

When the terminal processing device 40 is attached to the end portion of the cable, the terminal insulating jacket 42 is inserted and attached to the cable insulator 36 coated with silicone grease in advance with a predetermined force. After that, the electric wire 38 extending from the cable insulator 36 is electrically and mechanically connected to the terminal 12 by caulking the pressure contact portion 18 of the terminal 12.

According to the terminal processing device 40, the airtight characteristic equivalent to that of the terminal processing device 10 can be given to the terminal portion of the cable 34. Furthermore, since a core member for expanding the diameter of the terminal insulating jacket 42 in advance is not required, there is an effect that extra waste (core member) is not generated on site and the manufacturing cost can be reduced.

[0027]

As is apparent from the above description, according to the present invention, the terminal and the terminal insulating jacket are formed as separate members, and both are integrated in a watertight manner by a simple method before use. Since it is configured as described above, it is possible to eliminate the problem of enlarging the mold in the conventional integrally molded terminal processing device, the problem of the rubber component entering the terminal, and the cost disadvantage when a defect occurs. Since the waterproof tape treatment is not necessary, a terminal treatment device for a power cable is provided which has a small number of work steps and a small number of parts, and can obtain a stable and sufficient waterproof insulation protection function.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a terminal processing device according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional front view showing a process of mounting the terminal processing device of FIG. 1 on a cable terminal portion.

FIG. 3 is a partial sectional front view of the terminal processing device of FIG. 1 when a cable terminal portion is attached.

FIG. 4 is a partial sectional front view of a terminal processing device according to another embodiment of the present invention.

FIG. 5 is a partial cross-sectional front view of a conventional terminal processing device.

FIG. 6 is a partial cross-sectional front view of another conventional terminal processing device.

[Explanation of symbols]

 10, 40 ... Terminal processing device 12 ... Terminal 14, 42 ... Terminal insulating jacket 18 ... Press contact section 20 ... Support section 22 ... Projection edge section 24 ... Jacket member 26 ... Core member 34 ... Cable 38 ... Electric wire

Claims (3)

[Claims] 1. A terminal insulating jacket element, comprising a terminal made of an electrically conductive material, an electric wire made of an electric insulating material, exposed at the end of a covered electric wire, and a moisture-proof and insulating coating of a connecting portion between the electric wire and the terminal. In the electric wire terminal treatment device comprising: and a terminal part formed at the end of the covered electric wire, the terminal is a connecting part connected to an external good electric conductor,
A press-contact portion that extends from the connecting portion in a hollow shape and is compression-connected to the exposed electric wire, and a support portion that extends from the press-contact portion to a predetermined length and that fixedly supports the terminal insulating jacket element. The terminal insulation jacket element is a substantially cylindrical element made of a rubber material having a high elastic recovery rate, and contracts after being elastically expanded in diameter, so that the support of the terminal is provided at one end. An electric wire terminal treatment device, characterized in that the part is surrounded in a watertight manner and is fastened to the support part. 2. The terminal insulating jacket element is a substantially cylindrical jacket member made of a rubber material having excellent permanent elongation characteristics, and is disposed inside the jacket member, and a part of the jacket member is provided. A core member for holding the core member in an expanded state of a predetermined diameter dimension, wherein the jacket member is fastened to the support portion of the terminal at one end where the core member is not arranged, and the remaining portion is expanded. The electric wire end treatment device according to claim 1, which is maintained in a diameter state. 3. The terminal according to claim 1, further comprising: a protruding edge portion, between the pressure contact portion and the support portion, with which the one end portion of the terminal insulating jacket element abuts. Electric wire terminal processing device.