JPH10144368A - Connection structure of branch cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable miniaturization of a die and reduce a use quantity of a molding resin so as to reduce cost by forming an insulation spacer for isolating each conductor disposed in a die cavity for molding a mold insulation part and connected by a plurality of radiation-shaped isolation plate capable of abutting tip ends with die molding faces partially. SOLUTION: Each conductor of three core wires constituting a trunk line and each conductor of branch cables of branch lines are pressure welded and connected by a C-type connecting tube. This connection portion is isolated via an insulation spacer and disposed in a molding die cavity. Next, a fusion resin is ejected in the cavity, the connection portion is covered, and a mold insulation part is formed. In the branch cable connection structure, the insulation spacer 7 is constituted by an isolation wall 10 assembled in radiation shape. Further, tapered protrusions 10a and 10b are formed at tip ends of the front or rear part abutting with a cavity molding face of the isolation wall 10, and a recess 10C is formed intermediate thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branch cable connection structure for isolating respective connection portions of a trunk wire and a branch cable branched therefrom.

[0002]

2. Description of the Related Art For example, a wiring in which a branch cable of a branch line is connected to a core wire of a trunk line is used for wiring such as tunnel lighting. And as a means to connect the branch line to the main line,
For example, the following means are known.

FIG. 7 is a sectional view showing a conventional branch cable connection structure. The branch cable connection structure 30 includes a trunk line 31.
And the conductor 34a of each branch cable 34 forming the branch line 33 is connected to the C-type connecting pipe 3.
5, and the crimped connection is made with an insulating tape 3
6, and then placed in the cavity of the molding die to cover the insulating tape 36 and the like.
Is molded.

FIG. 8 is a cross-sectional view showing a conventional branch cable connection structure, and shows a branch cable connection structure disclosed in Japanese Utility Model Laid-Open Publication No. 60-183372, “Branch connection part”. FIG. 9 is a sectional view taken along line CC of FIG. The branch cable connection structure 40 includes the core wires 4 constituting the trunk line 41.
The two conductors 42a and the conductors 44a of the respective branch cables 44 constituting the branch line 43 are crimped and connected by a C-shaped connecting tube 45 (see also FIG. 9), and the crimped portions are cross-shaped to isolate each other. After the insulating spacer 47 is disposed and the insulating spacer 47 is wound with an insulating tape 48, the insulating spacer 47 is disposed in the cavity of the molding die, and a mold insulating portion 49 for covering the insulating spacer 47 and the like is molded. Things.

[0005]

However, in the means shown in FIG. 7, when molding the mold insulating portion 37, the molten resin injected into the cavity has a portion wound by the insulating tape 36. Due to the pressing, this portion is shifted from a predetermined position in the cavity. Therefore, since the mold insulating portion 37 at the displaced portion becomes thin, in order to secure the specified thickness of the mold insulating portion 37, the mold insulating portion 3
7 was overmolded. For this reason, a large mold is required, and the amount of molten resin used for molding is increased, which hinders cost reduction.

In the means shown in FIGS. 8 and 9, when the mold insulating portion 49 is molded, the molten resin injected into the cavity presses the insulating spacer 47 and the like, so that the insulating spacer 47 is formed. Deviates from a predetermined position in the cavity. Therefore, similarly to the above, the mold insulating portion 49 at the position where the insulating spacer 47 is displaced becomes thinner, so that the mold insulating portion 49 is formed larger in order to secure the specified thickness of the mold insulating portion 49. As a result, a large mold is required, and the amount of molten resin used for molding is increased, which hinders cost reduction.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, to reduce the size of a mold and reduce the amount of molten resin used for molding to reduce the cost of a branch cable connection. It is intended to provide a structure.

[0008]

In order to achieve the above object, a first aspect of the present invention is to connect a plurality of conductors constituting a trunk line and a plurality of conductors constituting a branch line, and to isolate each connected conductor. In a branch cable connection structure covered with a mold insulating portion, a plurality of separators that can be arranged in a cavity of a mold for molding the mold insulating portion and that isolate the connected conductors are formed radially. It is characterized in that an insulating spacer is provided in which each end of the plurality of separators is formed so as to be partially in contact with the molding surface of the mold.

When the insulating spacers are inserted in the mold cavity with the insulating spacer separator inserted between the electrically connected trunk conductor and the branch conductor, they are arranged radially. The tips of the plurality of separators abut against the molding surface, and the insulating spacer is securely fixed to the central portion in the cavity. Therefore, even if the molten resin filled in the cavity presses the insulating spacer, the insulating spacer does not shift in the cavity. Thereby, the mold covering portion in which the molten resin is solidified can be formed into a certain thickness.

According to a second aspect of the present invention, each of the connected conductors is bonded to the insulating spacer with an adhesive.

By bonding each of the connected conductors to the insulating spacer with an adhesive, there is no need to wind the insulating tape around the insulating spacer, so that the connection processing time of the branch cable connection structure can be reduced.

According to a third aspect of the present invention, each of the plurality of separators has a recess formed at the tip thereof.

A passage through which the molten resin flows can be formed by the separator of the insulating spacer and the molding surface of the mold. Therefore, when the insulating spacer is disposed in the cavity of the mold, even if the inside of the cavity is partitioned into a plurality of partitioned spaces by the separator of the insulating spacer, these zero partitioned spaces are communicated with each other through the passage of the molten resin. The molten resin can be evenly filled in the plurality of partitioned spaces.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a branch cable connection structure according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a sectional view showing a branch cable connection structure of the present invention, and FIG.
Is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a perspective view showing an insulating spacer of the present invention. As shown in FIG. 1, a branch cable connection structure 1 includes core wires 3 forming a trunk line 2 and branch wires 4.
, Each C-type connecting pipe 6 (see also FIG. 2) for crimping the conductor 3a of each core wire 3 and the conductor 5a of each branch cable 5, and the C-type connecting pipe 6 and C-type. Connection pipe 6
Spacer 7, an adhesive 8 for bonding the C-type connecting pipe 6, the core wire 3 and the branch cable 5 to the insulating spacer 7, and a mold insulating part 9 for covering the insulating spacer 7, the core wire 3 and the branch cable 5 Consists of

The insulating spacer 7 shown in FIG. 3 is a member formed of an insulating resin which is bonded to a molding material by fusing or bonding material, and radially connects three substantially rectangular isolation walls 10 respectively. It was done. Therefore, 3
The two partition plates 10 are arranged at an interval of 120 ° from each other. Tapered projections 10a and 10b are formed at the front end and the rear end of each partition plate 10, respectively. Protrusion 1
Reference numerals 0a and 10b denote molding surfaces 1 of a mold 12 to be described later.
2a. Thereby, when the insulating spacer 7 is disposed in the cavity 13 of the mold 12, the protrusions 10 a and 10 b of the insulating spacer 7 are formed.
Is in contact with the molding surface 12a of the molding die 12, and the insulating spacer 7 is fixed so as not to be displaced to the center in the cavity 13. By forming the projections 10a and 10b having tapered tips at the front end and the rear end of the partition plate 10, a concave portion 10c is formed at the tip of each partition wall 10.

Next, the connection process of the branch cable connection structure according to the present invention will be described. FIG. 4 is a first connection process diagram illustrating the connection process of the branch cable connection structure according to the present invention. First, the conductor 3a of each core wire 3 constituting the trunk line 2 and the conductor 5a of the branch cable 5 constituting the branch line 4 are crimp-connected with each C-type connecting pipe 6. Next, an adhesive 8 is applied to the isolation wall 10 of the insulating spacer 7 and each isolation wall 10 is attached to the C-type connecting pipe 6.
And the C-type connection pipe 6. As a result, the C-type connection pipe 6, the core wire 6, and the branch cable 5 adhere to each of the isolation walls 10 of the insulating spacer 7.

In this state, the mold 1 is opened.
2 and the mold die 12 is clamped so that the insulating spacer 7, the C-type connecting pipe 6,
The core wire 3 and the branch cable 5 are arranged in the cavity 13. At this time, the projections 10a and 10b formed at the tip of the isolation wall 10 of the insulating spacer 7 come into contact with the molding surface 12a of the molding die 12, and the insulating spacer 7
It is fixed so that it does not shift in the center of the inside. Further, a passage 15 for the molten resin is formed by the concave portion 10 c formed at the tip of the isolation wall 10 of the insulating spacer 7 and the molding surface 12 a of the mold 12.

FIG. 5 is a second connection step diagram for explaining the connection step of the branch cable connection structure according to the present invention.
-The state seen from the B line cross section is shown. The molten resin is injected from the molten resin injection port 16 of the molding die 12 into the first partitioned space 17 partitioned by the isolation wall 10 of the insulating spacer 7 in the cavity 13 as shown by the arrow, and the first partitioned space is formed. 17
Is filled with molten resin. The molten resin filled in the first partitioned space 17 passes through the passage 15 formed by the concave portion 10c of the partition wall 10 and the molding surface 12a of the mold 12 and is used in the second partitioned space 18 and the third partitioned space. Enter into 19. Thus, the cavity 13 is uniformly filled with the molten resin.

At this time, the molten resin presses the isolation wall 10 of the insulating spacer 7, but the insulating spacer 7
Since the insulating spacer 7 is fixed to the center of the cavity 3, the insulating spacer 7 does not shift from the center of the cavity 13.

FIG. 6 is a third connection step diagram for explaining the connection step of the branch cable connection structure according to the present invention, and shows a state in which the molten resin is uniformly filled in the cavity 13 of the molding die 12. The mold insulating portion 9 in which the molten resin in the cavity 13 has solidified covers the insulating spacer 7, the C-type connecting pipe 6, the core wire 3 and the branch cable 5 arranged in the cavity 13. In this case, since the insulating spacer 7 is arranged without being shifted from the center in the cavity 13, the thickness of the mold insulating portion 9 can be formed to a predetermined thickness. Next, the mold 12 is opened to take out the branch cable connection structure 1 from the mold 12.

In the above embodiment, the case where the insulating spacer 7 is formed by the three separating walls 10 has been described. However, the present invention is not limited to this, and the insulating spacer 7 may be formed by the two separating walls 10. It may be formed by three or more separating walls 10.

[0022]

As described above, according to the branch cable connection structure of the first aspect, the state in which the separator of the insulating spacer is inserted between the electrically connected trunk conductor and the branch wire conductor. When the insulating spacer is placed in the cavity of the mold, the tips of the radially arranged separators partially contact the molding surface, and the insulating spacer is securely fixed to the center of the cavity Is done. Therefore, even if the molten resin filled in the cavity presses the insulating spacer,
The insulating spacer does not shift within the cavity. This allows
The mold covering portion in which the molten resin has solidified can be formed to a certain thickness.

As a result, in consideration of the fact that the insulating spacer is displaced in the cavity as in the prior art, it is not necessary to form the mold insulating portion relatively large to secure the thickness of the mold insulating portion to a specified value. The size of the mold can be reduced and the amount of the molten resin for molding can be reduced by reducing the size of the mold insulating portion. Thereby, the cost of the branch cable connection structure can be reduced.

According to a second aspect of the present invention, since each of the connected conductors is bonded to the insulating spacer with an adhesive, there is no need to wind the insulating tape around the insulating spacer, so that the connection processing time of the branch cable connection structure can be reduced. .

According to the third aspect, a passage through which the molten resin flows can be formed between the separator of the insulating spacer and the molding surface of the mold. Therefore, when the insulating spacer is arranged in the cavity of the mold, even if the inside of the cavity is partitioned into a plurality of partitioned spaces by the separator of the insulating spacer, these partitioned spaces are communicated with each other through the passage of the molten resin. The molten resin can be evenly filled in the plurality of partitioned spaces. Thereby, the quality of the branch cable connection structure is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a branch cable connection structure of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view showing an insulating spacer of the present invention.

FIG. 4 is a first connection step diagram illustrating a connection step of the branch cable connection structure according to the present invention.

FIG. 5 is a second connection step diagram for explaining a connection step of the branch cable connection structure according to the present invention, and shows a state as viewed from a section line BB in FIG. 4;

FIG. 6 is a third connection step diagram illustrating the connection step of the branch cable connection structure according to the present invention.

FIG. 7 is a sectional view showing a conventional branch cable connection structure.

FIG. 8 is a sectional view showing a conventional branch cable connection structure.

FIG. 9 is a sectional view taken along the line CC of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Branch cable connection structure 2 Trunk line 3a, 5a Conductor 4 Branch line 7 Insulating spacer 8 Adhesive 9 Mold insulating part 10 Isolation wall 10c Concave part 12 Mold 13 Cavity

Claims (3)

[Claims] 1. A branch cable connection structure in which a plurality of conductors constituting a trunk line and a plurality of conductors constituting a branch line are connected, and the connected conductors are kept in an isolated state and covered with a mold insulating portion. A plurality of separators that can be arranged in a cavity of a mold for forming an insulating part and that isolate the connected conductors are formed radially, and respective tips of the plurality of separators are partially formed in the mold. A branch cable connection structure comprising an insulating spacer formed so as to be able to abut on a surface. 2. The branch cable connection structure according to claim 1, wherein each of the connected conductors is bonded to the insulating spacer with an adhesive. 3. The branch cable connection structure according to claim 1, wherein a concave portion is formed at each end of each of the plurality of separators.