JPH08149672A - Terminal joint of insulated wire - Google Patents

Abstract

PURPOSE: To enhance the reliability of product and the productivity significantly by resin molding the temperature sensor body including the insulation coating and the joint thereof integrally. CONSTITUTION: Predetermined length of insulation coating at the terminal of an insulated wire 1, the stripped end of a core 2, the temperature sensor body 3, the temperature sensor lead 4, and the entire circumference of he joint 5 of stripped core and temperature sensor lead are subjected to single resin molding. A resin molding 6 thus obtained exhibits excellent airtightness and since it is produced through single molding, it can be mass produced and thereby the productivity is enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal connecting portion in which a temperature sensor is attached to the end of an insulated wire.

[0002]

2. Description of the Related Art Conventionally, a temperature sensor component in which a temperature sensor such as a thermistor is attached to an end of an electric wire is a plastic pipe in which an electric wire or a metal wire (lead frame) instead of the electric wire is inserted, and A thermoplastic resin or silicone rubber type filler is enclosed in the pipe and integrated with the pipe to manufacture the holder part,
Then, the lead of the temperature sensor is connected to the tip of the electric wire or the metal wire by soldering or spot welding to seal the exposed portion such as the temperature sensor outside the plastic pipe. The encapsulation was performed by dipping a mixture of an epoxy resin with a curing agent and a filler, followed by drying to maintain watertightness and mechanical strength.

[0003]

Since the temperature sensor component constructed as described above is manufactured by combining the temperature sensor lead filler, the plastic pipe and the like, it lacks mass productivity and its product Was inferior in quality stability.

Further, since the temperature sensor main body provided on the tip side, for example, the thermistor portion, is sealed with an epoxy resin, there is a risk of pollution problems such as eczema during the handling depending on the person involved in the manufacturing. was there. Also, since the epoxy resin seals the temperature sensor part by the dipping method (application / drying), the thickness becomes uneven and a product with a uniform thickness cannot be obtained. Water is absorbed from the thin coating film part. There is a possibility that the characteristics of the temperature sensor may be deteriorated due to moisture absorption.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, and to greatly improve the reliability and productivity of the product, the terminal connection portion of the insulated wire as a temperature sensor component. To provide.

[0006]

The terminal connection portion of the insulated wire provided by the present invention is formed by connecting the lead of the temperature sensor to the bare core wire terminal in the terminal portion of the insulated wire,
A resin-sealed molded body that is molded once around the entire circumference of the required length of the insulation coating at the insulated wire end, the exposed core wire end, the temperature sensor body, the temperature sensor lead, and the connection part between the exposed core wire end and the temperature sensor lead. It is made by applying.

Further, as another means of the terminal connecting portion of the insulated wire provided by the present invention, in addition to the above means, a positive gap is provided at the boundary between the resin-molded molded product and the insulation coating of the insulated wire. It is formed by filling the gap with a filler and filling the gap.

[0008]

According to the terminal connecting portion of the insulated wire according to the present invention, the temperature sensor body including the insulating coating of the insulated wire and the connecting portion of both of them are integrated with the resin-sealed molded product by one-time molding. It is possible to always obtain quality retention and uniform thickness by molding, and it is excellent in mass productivity and reproducibility and mechanical strength. In addition, the insulation coating of the insulated wire and the adhesion to the temperature sensor and their connecting parts are also good, and since there is no seam in the molded body by once molding, watertightness that can prevent the ingress of moisture and humidity, Airtightness can be obtained.

Further, according to another means of the present invention, the characteristics of the resin-sealed molded body obtained by the one-time molding are followed as they are, and the sealing is performed at the boundary between the insulated wire and the resin-sealed molded body. By being applied, it is possible to more reliably prevent the entry of moisture or humidity from the interface between the insulated wire and the resin-sealed molded body.

[0010]

1 shows an embodiment of an end connecting portion of an insulated wire according to the present invention, in which 1 is an insulated wire, 2 is a bare core wire terminal at an insulated wire end portion, 3 is a temperature sensor main body,
Reference numeral 4 is a temperature sensor lead, 5 is a connecting portion between the bare core wire end 2 and the temperature sensor lead 4, and 6 is a resin-sealed molded body obtained by one-time molding.

The insulated wire 1 is made of vinyl on a core wire such as a copper wire.
It is formed by applying an insulating coating of a thermoplastic resin such as polyethylene or polypropylene. In the case of this embodiment, a copper wire is used as a core wire and a 2-core parallel type is used as a vinyl insulating coating.
In the terminal, the insulation coating is stripped off to expose the core wire terminal 2.

The temperature sensor main body 3 comprises a temperature detecting thermistor, and the temperature sensor lead 4 is a copper wire.
The temperature sensor lead 4 is connected to the bare core wire terminal 2 as described above. The connection portion 5 is formed by soldering or spot welding.

The resin-encapsulated molded body 6 uses an engineering plastic such as polyphenylene oxide (PPS), ABS resin, polybutylene terephthalate (PBT), polyethylene terephthalate (PET), or modified PPO as a resin material. The required length of the insulation coating at the end portion of 1 was applied once to the entire circumference of the exposed core wire end 2, the temperature sensor body 3, the temperature sensor lead 4 and the connection portion 2 between the exposed core wire and the temperature sensor lead. It is a thing. In 6 of the resin-sealed molded body, the portion covering the required length of the insulation coating functions as a stick-integrated portion with the insulated wire 1 and a holder portion for holding it in a rod shape, and the tip side portion thereof literally seals the temperature sensor. Function as a part.

FIG. 2 shows another embodiment of the terminal connecting portion of the insulated wire according to the present invention. The same reference numerals as those in FIG. 1 indicate the same structural / functional portions. Therefore, it is advisable to also refer to the description relating to FIG.

In this embodiment, a positive gap is formed at the boundary between the insulated wire 1 and the resin-sealed molded body 6 in the portion of the resin-sealed molded body 6 that serves as a holder for the insulated wire, and the gap is formed in the gap. The filling 7 is performed by filling a plastic or rubber filler. According to this embodiment, FIG.
While directly following the advantages of the embodiment described above, the sealing portion 7 is more reliable against moisture and humidity that are transmitted along the surface of the insulated wire 1 or the resin-sealed molded body 6 and try to enter the interface between the two. It was possible to construct a water-tight and air-tight barrier.

[0016]

As described above, according to the terminal connecting portion of the insulated wire according to the present invention, the temperature sensor portion including the insulated wire is completely sealed with the resin-sealed molded product obtained by one-time molding. Therefore, the watertightness and airtightness are extremely good. In addition, since it is molded once, it is highly mass-producible and has great price merit. Since it is not necessary to use an epoxy resin as a sealing agent,
Eliminate pollution problems. Since it is molded with a mold, the shape is always constant, reproducibility is improved, and performance is stable. And so on. Further, according to another means of the present invention, it is possible to further secure the watertightness and airtightness of the interface between the insulated electric wire and the resin-sealed molded body by sealing after following the above effects. effective.

[Brief description of drawings]

FIG. 1 is a partially sectional front view showing an embodiment of an end connecting portion of an insulated wire according to the present invention.

FIG. 2 is a partially sectional front view showing another embodiment of the terminal connecting portion of the insulated wire according to the present invention.

[Explanation of symbols]

 1 Insulated wire 2 Bare wire core terminal 3 Temperature sensor main body 4 Temperature sensor lead 5 Connection part 6 Resin molded product 7 Sealing part

Claims (2)

[Claims] 1. A lead of a temperature sensor is connected to a bare core wire terminal at an end portion of an insulated wire, and a bare core wire terminal, a temperature sensor main body, and a temperature sensor lead are provided for a required length of an insulating coating at the insulated wire end portion. Also, the terminal connection part of the insulated wire is obtained by applying the resin-sealed molded product by molding once to the entire periphery of the connection part between the bare core wire end and the temperature sensor lead. 2. A lead of a temperature sensor is connected to a bare core wire end at an end portion of an insulated wire, and a bare core wire end, a temperature sensor, a temperature sensor lead, and a required length of insulation coating at the end portion of the insulated wire. The entire circumference of the connection between the bare core wire end and the temperature sensor lead is provided with a resin-molded body that is molded once, and a positive gap is provided at the boundary between the resin-molded body and the insulation coating of the insulated wire. The terminal connection part of the insulated wire formed by filling the gap with a filler and sealing it.