JPS6022770Y2 - Cable connection structure - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a cable connection structure.

Conventionally, in connection structures for this type of cable, the cable receiving side is formed with a conductor and contacts inside an insulator having a cable insertion port, while the cable side to be inserted is formed with a soft conductor and contacts on the tip of the cable. Generally, a configuration is adopted in which a stress cone is provided and the stress cone is pressed into the cable insertion port so as to be brought into close contact with the cable insertion port.

FIG. 1 shows a conventional example of such a cable connection structure.

1 is an insulator having a tapered cable insertion port 11 at its tip; a conductor 2 is buried inside this insulator 1; A tulip contact 3 consisting of a contact piece is housed in the holder to form a so-called cable receiving side.

On the other hand, on the cable 4 side, a stress cone 5 made of soft rubber or plastic and having a tapered outer periphery is integrally provided with a molded body 51 at the tip of the cable 4. A contact 42 that can be inserted into and removed from the tulip contact 3 is provided at the tip of the core wire 41.

Furthermore, a cylindrical pressing fitting 71 that presses the molded body 51 on the cable 4 via the spring 6 is attached to the cable 4 via mounting fittings 72 and 73.

This pressing fitting 71 is attached via a mounting nut 75 to a fixing fitting 74 embedded and fixed in the end of the insulator 1, so that the contact 42 of the cable 4 can be inserted into the insulator 1. The stress cone 5 is tightly engaged with the tapered inner circumferential surface of the cable insertion port 11 of the insulator 1 by the spring 6. .

By the way, in the above conventional connection structure, the cable insertion port 11 of the insulator 1, which is the side of the receiver, is tapered, and the stress cone 5, which is formed in a similar tapered shape, is inserted and tightly attached inside the cable insertion port 11 of the insulator 1. As a result, the receiver connects the side conductor 2 and the cable 4 into one stable end, and the stress cone 5 is pressed (elastically) supported by the spring 6 via the molded body 51 to reduce heat generation when energized. Therefore, even if the insulator 1, the stress cord 75, and the molded body 51 thermally expand, it is possible to absorb this and maintain the connected state without destroying each part.

However, if the structure is such that the stress cone 5 is brought into close contact with the insulator 1 as in the conventional example, the cable core wire 4
1 can be centered and the connection state is relatively stable, but in consideration of thermal expansion it is necessary to use an elastic support structure using the spring 6, and the number of parts is reduced due to the presence of the spring 6. In addition, the mold body 51 and the press fitting 71 must be structured so that the spring 6 can be attached thereto, resulting in a problem that the manufacturing work becomes complicated and expensive.

Furthermore, since the conductor 2 in the insulator 1 and the cable core wire 41 are connected by the tulip contact 3 consisting of a plurality of contact pieces, misalignment is likely to occur, and the bent part of the cable 4 is close to the connection part. If it is too much, the tulip contact 3 will shift due to the fact that the stress cone 5 forming the connection part is soft, resulting in incomplete contact.
There was a problem that the heat generated was even greater.

Further, since the tulip contact 3 is made up of a plurality of contact pieces extending in the axial direction, it has the disadvantage that not only is the axial dimension large, but also the holding force in the radial direction is relatively weak. There was a problem that the connection of the cable 4 was not accurate and stable.

The present invention was developed in view of the above points, and it connects the conductor on the receiving side and the cable with a ring contact, and also brings the insulator surrounding the conductor on the receiving side into close contact with the stress cone provided on the cable. The purpose of this invention is to simplify the structure of the connecting part, and to provide a cable connecting structure that is inexpensive and can be connected reliably.

Next, an embodiment of the present invention will be explained based on FIG.
Components with the same reference numerals as those in FIG. 1 above indicate equivalent products, and detailed explanations thereof will be omitted.

A stepped hole 21 is provided at the end of the conductor 2 embedded in the insulator 1 having the cable insertion port 11, and a ring contact 31 is attached and fixed to the large diameter portion 21a of the stepped hole 21. ing.

On the other hand, on the cable 4 side, a terminal fitting 43 is integrally fixed to the end of the cable core wire 41, and a connecting fitting 45 is provided so as to surround this terminal fitting 43 and a part of the insulation coating 4a of the cable 4. There is.

Further, a contact fitting 44 that can engage with a contact on the inner circumferential portion of the ring contact 31 is provided at the tip end (left end in the figure) of the terminal fitting 43.

The stress cone 5 is arranged so as to surround the connection fitting 45 and the insulating sheath 4a of the cable 4, and is mounted on the cable 4 integrally with the molded body 51.

The conductor 2 in the insulator 1 formed as described above and the cable 4 are electrically connected to the conductor 2 by inserting the connecting fitting 45 at the tip of the cable core wire 41 into the ring contact 31, and The body 1 and the cable 4 are integrally connected by a pressing fitting 7 that engages with the end of the molded body 51.
1 is mounted on the cable 4 via the mounting fittings 72 and 73, and the pressing fitting 71 is integrally connected to the fixing fitting 74 provided at the end of the insulator 1 via the mounting nut 75. It is being done.

The dimensions of each part constituting the connection part are determined so that a desired gap G is formed between the inner peripheral surface of the cable insertion port 11 of the insulator 1 and the stress cone 5 when the cable 4 is connected. It is something that

As is clear from the above description, the present invention connects the conductor 2 in the insulator 1 and the cable core 41 of the cable 4 with the ring contact 31 having a large radial holding force. 4, that is, the contact fitting 44 is stably held.

This allows the connection between the insulator 1 and the cable 4,
There is no need to bring the outer peripheral surface of the stress cable 75 into close contact with the inner peripheral surface of the cable insertion port 11 for centering.

Therefore, the outer peripheral surface of the stress cone 5 and the cable insertion port 1
A required gap G can be provided between the inner circumferential surface of 1 and
The existence of this gap G allows the thermal expansion between the two to be absorbed, so the stress cone 5
There is no need to elastically press and support the molded body 51 with a spring, and the structure of the connecting portion can be simplified.

Moreover, since the stress cone 5 is not elastically pressed and supported by a spring as in the conventional case, a large force is not required to tighten the mounting nut 75 etc. when connecting the cable 4, so work efficiency is very high. It is convenient for
Moreover, the pressing fitting 71, the mounting nut 75, and the cable insertion port 11 of the insulator 1. The strength of the fixing fitting 74 is such that it can be made smaller without any need for conventional products.

Further, since the ring contact 31 has a relatively short axial dimension, the connecting portion can be further downsized.

Therefore, the cable connection structure according to the present invention is small and inexpensive, and can be easily attached and detached.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional cable connection structure, and FIG. 2 is a sectional view of a cable connection structure according to an embodiment of the present invention. 1 is an insulator, 11 is a cable insertion port, 2 is a conductor, 31 is a ring contact, 4 is a cable, 41 is a cable core wire, and 5 is a stress cone.

Claims (1)

[Scope of utility model registration request] The cable receiving side is formed by providing a conductor and a contact inside an insulator having a cable insertion opening, while the cable side to be inserted is formed by providing a soft stress cone around the tip of the cable, and this stress cone is formed by providing a soft stress cone around the tip of the cable. is housed in the cable insertion port, the cable is attached and fixed to the insulator, and the cable core wire of the cable is brought into contact engagement with the contact, and the cable is attached to the conductor in the insulator. 1. A cable connection structure characterized in that the contact is formed by a ring contact, and the stress cone is arranged with a required gap therebetween without contacting the inner circumferential surface of the insertion opening of the insulator.