JPH069316U - Molded body for connection part or terminal part of electric cable - Google Patents

Abstract

(57) [Summary] [Objective] The insulating layer can be manufactured with high productivity by the rubber injection method while preventing the deformation of the outer conductive layer of the molded body for the connection part or the terminal part of the electric cable. [Structure] An interface 24 at an end portion between the external conductive layer 22 and the insulating layer 20 inside the external conductive layer 22 is formed as a curved surface that is recessed inward. The outer conductive layer 22 is formed in a stepped shape so that the outer surface 22c corresponding to the curved interface is indented. Therefore, since the curved surface 22b of the outer conductive layer 22 is close to the cavity surface of the mold, it is not deformed even when rubber is injected during the molding of the insulating layer 20, and therefore the insulating material having a stable size and shape is obtained. The layer 20 can be molded.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a multilayer molded body which is attached to an electric cable connecting portion or a terminal portion to connect an electric cable or various electric devices.

[0002]

[Prior art]

 This type of molded body is composed of a multilayer molded body such as an inner conductive layer, an insulating layer, and an outer conductive layer for insulating the connection portion or the terminal portion of the electric cable. In order to improve its electrical characteristics, this multilayer molded article has an inwardly curved surface at the interface between the insulating layer and the outer conductive layer at its end. FIG. 4 shows a prior art multi-layer molded body, and it can be seen that the interface 24 between the insulating layer 20 and the outer conductive layer 22 is curved so as to be indented. The outer surface 22a of the outer conductive layer 22 is a linear tapered surface. In FIG. 4, reference numeral 18 indicates an internal conductive layer, and reference numeral 20a indicates a parallel tip portion of the insulating layer 20.

In this molded body, as shown in FIG. 5, usually, an inner conductive layer 18 and an outer conductive layer 22 which are previously molded by an appropriate molding means are set in a mold, and the inner and outer conductive layers 18 are formed. 22 is formed by injecting rubber in the direction of arrow a by injection molding or transfer molding to mold the insulating layer 20.

However, since the curved surface 22b serving as an interface of the outer conductive layer 22 set in the mold has a large wall thickness, it is deformed by the pressure at the time of rubber injection as shown by an arrow b, and the interface There is a risk that the material may be deformed to impair the electrical characteristics. Therefore, the thickness of the parallel tip portion 20a of the insulating layer is designed to be large in advance in consideration of a reduction in the thickness of the insulating layer 20 due to the deformation of the outer conductive layer 22, or after the insulating layer 20 is molded, the external Attempts have been made to shape the conductive layer 22.

[0005]

[Problems to be solved by the device]

 However, even if the thickness of the parallel tips of the insulating layer is increased, the amount of deformation of the outer conductive layer 22 is not constant, so the dimensions are not stable and the quality varies greatly, and the tip of the interface where the rubber bends is large. Since it did not flow into the mold, it was not possible to obtain a molded product with a stable shape.

In addition, in the method of molding the outer conductive layer 22 on the insulating layer 20, since the outer conductive layer 22 is often thin and cannot be molded by an injection method, it must be molded by compression molding. However, there is a drawback that productivity is low.

An object of the present invention is to avoid the above-mentioned drawbacks, and to prevent the deformation of the outer conductive layer while molding the insulating layer by the rubber injection method with high productivity, for connecting portion or terminal portion of the electric cable. It is to provide a molded body.

[0008]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention comprises a multilayer molded body portion which is attached so as to cover a conductor connecting portion or a terminal portion of an electric cable, and an outer conductive layer of this multilayer molded body portion and an insulating layer inside thereof. In the connection part of the electric cable or the molded part for the terminal part where the interface of the end of the is formed in the inwardly curved surface, the outer surface corresponding to the curved surface of the outer conductive layer is stepped or thin so that it is indented. Another object of the present invention is to provide a molded body for a connection portion or a terminal portion of an electric cable, which is formed into a shape.

[0009]

[Action]

 In this way, if the outer surface corresponding to the curved interface of the outer conductive layer is formed stepwise or thinly so as to indent, this portion approaches the cavity surface of the mold and deformation is suppressed, Therefore, the insulating layer having a stable size and shape can be molded, and the electrical characteristics of the molded body are not deteriorated.

[0010]

Embodiment An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a connecting portion 12 of an electric cable using a molded body 10 according to the present invention. 4 is attached so as to cover the connection portion 16.

The molded body 10 of the present invention comprises multi-layer molded body portions, and in the illustrated embodiment, these multi-layer molded body portions include an inner conductive layer 18, an insulating layer 20, and an outer conductive layer 22. I'm out. The interface 24 at the end of the outer conductive layer 22 and the insulating layer 20 inside thereof is formed as a curved surface that is recessed inward. As shown in FIG. 2, the outer conductive layer 22 is formed in a stepped shape so that the outer surface 22c corresponding to the curved interface is indented.

As described above, when the outer surface 22c corresponding to the curved interface 24 of the outer conductive layer 22 is formed in a stepped shape so as to be dented inward, this portion approaches the cavity surface of the mold, Even if rubber is injected in the axial direction (arrow x direction) when molding the insulating layer 20, the cavity surface of the mold serves as a stopper in the y direction perpendicular to this injection direction. Does not deform, and therefore the insulating layer 20 can be molded with a stable size and shape, and the electrical characteristics of the molded body 10 are not deteriorated.

FIG. 3 shows another embodiment of the present invention. In this embodiment, the outer surface 22d corresponding to the curved interface 24 of the outer conductive layer 22 is formed thin so as to be recessed inward. In this embodiment as well, since the curved surface 22a similarly approaches the cavity surface of the mold, even if rubber is injected when molding the insulating layer 20, the cavity surface does not become a stopper and deform. Therefore, the insulating layer 20 can be similarly shaped with a stable size and shape.

It should be noted that in the above embodiment, the molded body 10 was a straight line extending in the axial direction, but in the present invention, the curved interface 24 is provided between the external conductive layer 22 and the insulating layer 20. If it exists, it can be applied to a molded article having an appropriate shape such as L-shape, T-shape, and π-shape.

[0015]

[Effect of device]

 According to the present invention, as described above, since the outer surface corresponding to the curved interface of the outer conductive layer is formed stepwise or indented in a thin shape, this portion of the outer conductive layer is formed in the mold cavity. Since it is close to the surface, it will not be deformed even if rubber is injected during the molding of the insulating layer, so it is possible to mold an insulating layer with a stable size and shape, and to reduce the electrical characteristics of the molded body. Absent.

[Brief description of drawings]

FIG. 1 is a cross-sectional side view showing a part of a connecting portion of an electric cable using a molded body according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a part of a molded body according to an embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional view of a part of a molded body according to another embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view of a part of a conventional molded body.

5 is a cross-sectional view showing a state where the molded body of FIG. 4 is manufactured.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Molded body 12 Connection part of electric cable 14 Electric cable 16 Connection part 18 Internal conductive layer 20 Insulating layer 22 External conductive layer 22b Curved surface 22c Stepped outer surface 22d Thin outer surface 24 Curved interface

Claims (1)

[Scope of utility model registration request] 1. A multilayer molded body portion attached so as to cover a conductor connecting portion or a terminal portion of an electric cable, wherein an end interface between an outer conductive layer of the multilayer molded body portion and an insulating layer inside thereof is inward. In the molded portion for connecting portion or terminal portion of the electric cable formed on the concave curved surface, the outer surface corresponding to the curved interface of the outer conductive layer is formed in a stepped shape or a thin wall shape so as to be dented inward. A molded body for a connecting portion or a terminal portion of an electric cable, which is characterized in that.