JPH0714621A - A pair of protective sheets for manufacturing conductor connection parts - Google Patents

Abstract

(57) [Abstract] [Purpose] A wide range of wire sizes and combinations can be accommodated, and unwelded parts are eliminated as much as possible, waterproof,
Provided is a pair of protective sheets capable of improving the moisture-proof performance. [Structure] A conductor connecting portion J of the insulated coated electric wires 1 and 2 and an insulating coating layer in the vicinity thereof are sandwiched from both upper and lower surfaces, and the sandwiched portion is applied with a vibration wave between a vibration source and a vibration receiving portion for welding. In the pair of protective sheets for producing a conductor connecting portion for forming the mold insulating layer, the entire surface is formed of only a low melting point material such as hot melt, and the surface of the protective sheet 21 disposed on the side of the vibration wave receiving portion is It is a flat surface, and the uneven strips 23a are concentratedly provided on a portion of the surface of the protective sheet 23 arranged on the side of the vibration wave generating source in contact with the conductor connecting portion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pair of protective sheets for producing a conductor connecting portion having a high insulating property and a high waterproof property, and in particular, conductor connecting by melting and welding with a vibration wave such as ultrasonic waves. The present invention relates to a pair of protective sheets for insulating and waterproofing a part.

[0002]

2. Description of the Related Art For example, when another wire is branched and connected to an insulation-coated wire, the conductor connecting portion must be subjected to insulation / waterproofing. Conventionally, as a method thereof, JP-A-2-212125
The method shown in Japanese Patent Publication is known.

In this method, the insulation-coated electric wire is stripped off to connect the conductors to each other, and the conductor-connected portion and the insulation coating layer in the vicinity thereof are sandwiched from both the upper and lower sides by a protective sheet having hot melt applied to the surface, The hot melt in the sandwiched portion is melted by ultrasonic waves to form a mold insulating layer. In this case, the protective sheet has a two-layer structure in which a low melting point material layer (hot melt layer) is formed on the surface of a high melting point material layer (for example, a vinyl chloride sheet).

This method will be specifically described below with reference to the drawings.

In FIG. 7, reference numeral 1 denotes an insulation-coated electric wire. First, the insulation coating layer 1a in the middle portion is peeled off to expose the conductor 1b, and the conductor 2b at the end of the branch line 2 is crimped by a conductor sleeve 3. Connecting. Reference numeral 4 is a protective sheet having a two-layer structure in which the hot melt 4b is applied to one surface of the high melting point material layer 4a to an appropriate thickness. Reference numerals 5 and 6 denote a pair of welding dies, and welding grooves 5a and 6a corresponding to the insulating protection shape of the conductor connecting portion are formed in the opposing end surfaces of the dies. An ultrasonic horn (not shown) as a vibration source is attached to the upper mold 5, and the lower mold 6 is an anvil (vibration receiving portion). Of course it may be upside down.

In order to insulate and protect the conductor connection portion J of the insulation-coated electric wire 1 and the branch line 2, the protective sheet 4 is placed on the lower mold 6 with the hot melt 4b facing up, and the conductor connection is made thereon. Place the portion J so that it is located in the welding groove 6a, and stack another protective sheet 4. Then, the conductor connection portion J is sandwiched by the hot melt 4b from both upper and lower surfaces. The sandwiching with the protective sheet 4 can also be performed by folding one sheet in two.

Then, as shown in FIG. 8, the upper mold 5 is lowered, and ultrasonic waves are generated by an ultrasonic horn while applying pressure with an appropriate pressure to ultrasonically vibrate the welding grooves 5a and 6a. Thereby, the hot melt 4b of the protective sheet 4
Melts due to the frictional heat generated by vibration and adheres to the conductor connecting portions J, that is, the exposed conductors 1b and 2b, the conductor sleeve 3 and the insulating coating layer 1a in the vicinity, and the mold insulating layer R is formed by cooling as shown in FIG. Thus, invasion of water or the like from the outside into the conductor connecting portion J is blocked.

In this case, in the example of FIG. 7, as the protective sheet 4, the hot melt 4 is formed on the surface of the flat refractory material layer 4a.
As shown in FIG.
0, as shown in FIG. 11, there may be used one in which a large number of flexible protrusions 14c are formed on the surface of the high melting point material layer 14a and the hot melt 14b is applied thereon. In such a case, the ultrasonic energy is concentrated on the tips of the protrusions 14c, and the heat is gradually transferred to other portions from this, so that the hot melt 4a is completely melted. In addition to the method of melting the low melting point material layer with ultrasonic waves, there is a method of melting the low melting point material layer with high frequency.

[0009]

By the way, particularly when the hot melts 4b and 14b are melted by ultrasonic waves, the pressing force acting between the electric wires 1 and 2 and the protective sheets 4 and 14 is large depending on whether the melted state is good or bad. Affect. Therefore, when the protective sheet 4 under the same conditions is used, the larger the wire size and the larger the number of connecting wires, the higher the pressing force in the welding grooves 5a and 6a is, so that they are easily melted and burn easily. On the contrary, the smaller the electric wire size and the smaller the number of connections, the lower the pressing force in the melting grooves 5a and 6a, so that unmelting is likely to occur and an incomplete mold is likely to be formed. As described above, in the conventional protective sheets 4 and 14, since the pressing force is likely to change depending on the combination of the wire size and the number of wires,
It was necessary to take measures such as preparing multiple types of protective sheets with different amounts of hot melt applied depending on the wire size and the number of connections.

Further, the harder the ultrasonic wave is, the better the vibration is, so that the ultrasonic wave is easily transmitted and welded. However, since the insulating coating layer 1a is made of soft PVC, the vibration is not sufficiently transmitted to this portion and the same portion is not welded. It was easy. Further, generally, unlike the horn side, the anvil side does not vibrate, so the sheet is difficult to melt, and the sheet on the anvil side is apt to be unwelded and is not easily sealed.

In consideration of such circumstances, the present invention can accommodate a wide range of electric wire sizes and combinations, and can eliminate unwelded portions as much as possible to improve waterproof and moisture-proof performance. The purpose is to provide a protective sheet.

[0012]

According to the present invention, a conductor connecting portion of an insulating coated electric wire and an insulating coating layer in the vicinity thereof are sandwiched from both upper and lower surfaces, and the sandwiched portion is vibrated between a vibration source and a vibration receiving portion. In a pair of protective sheets for manufacturing a conductor connecting portion, in which waves are applied and welded to form a mold insulating layer, the whole is formed of only a low melting point material such as hot melt, and is arranged on the side of the vibration wave receiving portion. The surface of the protective sheet is a flat surface, and the surface of the protective sheet disposed on the side of the vibration wave generation is characterized by being provided with concavo-convex portions or convex portions concentratedly at a portion in contact with the conductor connecting portion. There is.

[0013]

Since the protective sheet having the above structure is made of only the low melting point material, it is easy to flexibly cope with the change in the size and shape of the electric wire. In addition, since there are concavo-convex parts or convex parts that are concentrated in the parts that come in contact with the conductor connection part where vibrations are easily transmitted and heat is generated, the low melting point material melted at that part spreads to the insulating coating layer side and fills the gaps of the wire etc. To be done. Further, since the surface of the vibration-receiving portion-side protective sheet is flat, it has good adhesion to the electric wire and promotes melting.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a protective sheet according to an embodiment of the present invention. Reference numeral 21 denotes a protective sheet on the anvil side (vibration receiving portion side), which is entirely formed of a low melting point material and has a flat surface. Reference numeral 23 denotes a horn side (vibration source side) protection sheet, which is entirely made of a low melting point material, and has a plurality of concavo-convex strips (concavo-convex portions) 23 extending in the same direction at the center of the surface.
a are formed intensively at intervals.

In order to insulate and protect the conductor connecting portion J using the pair of protective sheets 21 and 23, the protective sheet 23 is arranged on the horn side mold 5 as shown in FIG. The protective sheet 21 is placed on the. Then, the electric wires 1 and 2 are extended in a direction orthogonal to the central uneven strip 23,
The conductor connecting portion J is positioned at the center and ultrasonic waves are applied as in the conventional case. Then, since the uneven strip 23a is in close contact with the hard conductor connecting portion J where ultrasonic vibration is easily transmitted, as shown in FIG. 3, the portion is efficiently melted by vibration, and the material is melted to the insulating coating layer side. Spreads and welds as shown by the arrow (a).

In this case, since the entire protective sheets 21 and 23 are made of a low melting point material, FIG.
Even if it is applied to the conductor connecting portions of the thin electric wires 11a and 11b as shown in FIG. 4 and to the conductor connecting portion of the thick electric wires 11c as shown in FIG. Good, and a good sealing state can be secured. Also,
Since the central portion is substantially thickened by forming the uneven strip 23, there is no possibility of the electric wire protruding from the conductor connecting portion J.

In the above embodiment, the uneven strip 23a is formed on the surface of the protective sheet 23 on the horn side. However, as in the protective sheet 33 shown in FIG.
3a may be formed in a mountain shape. Also, triangular protrusions may be formed. Further, as in the protective sheet 43 shown in FIG. 6, the range in which the uneven strips 43a are provided may be limited to the range j of the conductor connecting portion J. In addition, if the material is to be installed in the engine room of an automobile, etc.
You may use the thing of melting | fusing point of about 00 degrees-150 degrees.

[0019]

As described above, since the protective sheet of the present invention is composed only of the low melting point material, it is inexpensive and can flexibly cope with changes in the wire size and shape. Further, since the uneven portion or the convex portion is concentratedly arranged in the easily meltable portion, the melted material effectively spreads to the insulating coating layer side, the gap between the electric wires is sealed, and the sealing performance is improved. . Also, since the surface of the protective sheet on the side of the vibration receiving part is formed flat, it has good adhesion and functions to promote the above-mentioned melting effect, resulting in the elimination of unwelded parts and improved sealing performance. Has the effect of doing.

[Brief description of drawings]

FIG. 1 is a perspective view of a protective sheet according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which a conductor connecting portion is insulated by using a protective sheet according to an embodiment of the present invention.

FIG. 3 is a side view shown for explaining the operation of the embodiment of the present invention.

4A and 4B are diagrams showing a cross-sectional structure of an electric wire connecting portion obtained according to an embodiment of the present invention, in which FIG. 4A is a sectional view in the case of a thin electric wire, and FIG. 4B is a sectional view in the case of a thick electric wire. It is a figure.

FIG. 5 is a side view showing a state in which a conductor connecting portion is being subjected to insulation treatment by using another embodiment of the present invention.

FIG. 6 is a side view showing a state in which a conductor connecting portion is being subjected to insulation treatment using still another embodiment of the present invention.

FIG. 7 is an explanatory view of a method for manufacturing a conductor connecting portion using a conventional protective sheet.

FIG. 8 is an explanatory diagram of a step subsequent to that in FIG. 7.

9 is an external view of a conductor connecting portion manufactured by the method shown in FIGS. 7 and 8. FIG.

FIG. 10 is an explanatory diagram of a method for manufacturing a conductor connecting portion using another conventional protective sheet.

11 is a perspective view of a conventional protective sheet used in the method of FIG.

[Explanation of symbols]

 1, 2 Insulation-coated electric wire 5 Vibration source side mold 6 Vibration receiving part side mold J Conductor connection part 21, 23, 33, 43 Protective sheet 23a, 43a Concavo-convex strip (concave-convex part) 33 Thick part (convex) Part)

Claims (1)

[Claims] 1. A conductor connecting portion of an insulation-coated electric wire and an insulation coating layer in the vicinity thereof are sandwiched from both upper and lower surfaces, and the sandwiched portion is applied with a vibration wave between a vibration source and a vibration receiving portion for welding. In a pair of protective sheets for manufacturing a conductor connecting portion forming a mold insulating layer, the entire surface is formed of only a low melting point material such as hot melt, and the surface of the protective sheet arranged on the side of the vibration wave receiving portion is a flat surface. A pair for producing a conductor connecting portion, characterized in that uneven portions or convex portions are concentratedly provided on a portion of the surface of the protective sheet arranged on the side of the vibration wave generating source in contact with the conductor connecting portion. Protective sheet.