JP6210641B2 - Covered wire intermediate material, covered wire, method for manufacturing covered wire, and wire harness - Google Patents

Description

  The present invention relates to a covered electric wire intermediate material, a covered electric wire formed by processing the covered electric wire intermediate material, a method for manufacturing the covered electric wire, and a wire harness including the covered electric wire.

  Conventionally, coated wires used in wire harnesses routed in vehicles, etc., may cause problems due to water intruding into the environment in vehicles, etc., and various covered wires with improved water-stopping have been proposed. (For example, refer to Patent Document 1). As shown in FIG. 9, the covered electric wire 700 described in Patent Document 1 includes a hollow stranded wire conductor 701 in which a plurality of conductor strands are twisted together, and an airtight structure in which a hollow portion of the stranded wire conductor 701 is filled with a polyethylene compound. A portion 702 and an insulator 703 that covers the outer peripheral surface of the stranded wire conductor 701 are provided. In the covered electric wire 700, an airtight portion 702 filled in the stranded wire conductor 701 is formed by inflating the polyethylene compound disposed in the stranded wire conductor 701 when the insulator 703 is extrusion-coated, thereby stopping the insulation wire 701. Aqueous property can be improved.

JP 2005-19392 A

  However, in the covered electric wire 700, the water tightness can be improved by the airtight portion 702. However, in the configuration in which the airtight portion 702 is provided in a part of the longitudinal direction, the water stop position is determined in advance at the manufacturing stage of the covered electric wire 700. There is a problem that water cannot be stopped at a desired position when the wire harness is manufactured.

  Accordingly, the present invention provides a covered electric wire intermediate material, a covered electric wire, a method for manufacturing the covered electric wire, and a wire harness capable of improving water-stopping properties by simple processing at a desired position, paying attention to the above-described problems. The purpose is to do.

  In order to solve the above-mentioned problem, the invention described in claim 1 is a coated wire intermediate material that becomes a coated wire by being processed, and accommodates a plurality of strands and the plurality of strands inside. A tube-shaped covering portion made of an insulating synthetic resin, and the covering portion is melted by being partially heated and compressed in the longitudinal direction of the covering portion from the periphery of the covering portion. A part of the covered portion thus formed is configured to penetrate into the gaps between the plurality of strands.

  According to a second aspect of the present invention, in the first aspect of the present invention, the outer covering portion further includes an outer covering portion made of a material having a melting point higher than that of the covering portion. It is characterized by that.

  The invention described in claim 3 is a covered electric wire obtained by processing the covered electric wire intermediate material according to claim 1 or 2, and is partially heated from the periphery of the covering portion in the longitudinal direction of the covering portion. A covered electric wire provided with a water stop portion that compresses and melts the covering portion, partially infiltrates the gap between the plurality of strands, and solidifies the molten covering portion It is.

  The invention described in claim 4 is characterized in that, in the invention described in claim 3, the water stop portion is provided at a position inside the longitudinal direction from the terminal.

  The invention described in claim 5 is the invention described in claim 3 or 4, wherein a plurality of the water stop portions are provided.

  The invention described in claim 6 is a wire harness including the covered electric wire according to any one of claims 3 to 5.

  The invention described in claim 7 is obtained by processing and covering a covered electric wire intermediate material having a plurality of strands and a tube-shaped covering portion made of an insulating synthetic resin containing the plurality of strands inside. A method of manufacturing a covered electric wire for manufacturing an electric wire, wherein the covering portion is melted by partially heating and compressing the surrounding portion in the longitudinal direction of the covering portion, and a part thereof penetrates into the gaps of the plurality of strands. A method for producing a covered electric wire, comprising: a heat compression step for forming a water stop portion and a water stop portion forming step for solidifying the melted cover portion to form the water stop portion.

  According to the invention described in claim 1, it has a plurality of strands and a tube-shaped covering portion made of an insulating synthetic resin containing the plurality of strands inside, and the covering portion is The coating portion is melted by being partially heated and compressed in the longitudinal direction of the covering portion from the periphery of the covering portion, and a part of the melted covering portion penetrates into the gaps of the plurality of strands. ing. From this, by heat-compressing from the periphery of the coating portion and infiltrating the molten coating portion into the gaps between the plurality of strands, water can be stopped by the coating portion solidified thereafter in the heat-compressed portion. The water stoppage can be improved by simple processing at a desired position.

  According to the invention described in claim 2, the outer covering portion further includes an outer covering portion that is provided over the entire outer peripheral surface of the covering portion and made of a material having a melting point higher than that of the covering portion. For this reason, by providing an outer covering, the outer peripheral surface of the covering can be covered with an appropriate material according to the routing environment of the covered electric wire, and the covered electric wire intermediate of the covered electric wire is less likely to deteriorate over time. Material can be provided.

  According to the invention described in claim 3, the coating portion is partially heated and compressed from the periphery of the coating portion in the longitudinal direction, the coating portion is melted, and a part thereof is formed of the plurality of strands. Since the water-stopping portion obtained by solidifying the coating portion that has been infiltrated into the gap and then melted is provided, the water-stopping property can be improved by simple processing at a desired position.

  According to the invention described in claim 4, since the water stop portion is provided at a position on the inner side in the longitudinal direction from the terminal, the covering portion can be easily removed by peeling, and the terminal processing Property can be improved.

  According to the invention described in claim 5, since a plurality of water stop portions are provided, water can be stopped more reliably, and the water stop reliability of the covered electric wire can be improved.

  According to the invention described in claim 6, since the covered electric wire according to any one of claims 3 to 5 is provided, the water stoppage of the covered electric wire constituting the wire harness is improved at a desired position. Can do. In addition, since the water stoppage can be improved by simple processing, in addition to providing a dedicated processing space / process as in the past, processing can be performed on the line at the time of manufacturing the wire harness.

  According to the seventh aspect of the present invention, the covering portion is melted by partially heating and compressing the covering portion from the periphery in the longitudinal direction of the covering portion, and a part thereof penetrates into the gaps of the plurality of strands. Since it includes a heat compression step and a water stopping portion forming step of solidifying the melted covering portion to form the water stopping portion, a covered electric wire with improved water stopping at a desired position can be easily obtained. It can be manufactured by processing.

It is a figure which shows the wire harness concerning the 1st implementation carrying of this invention. It is a figure which shows the covered electric wire with which the wire harness shown by FIG. 1 is provided. It is sectional drawing which shows the covered electric wire intermediate material processed into the covered electric wire shown by FIG. It is a figure explaining the method of processing the covering electric wire intermediate material shown by FIG. It is a figure which shows the cross section of the water stop part formed by processing the covering electric wire intermediate material shown by FIG. It is a figure which shows the side surface of the water stop part shown by FIG. It is a figure which shows the cross section of the covering electric wire intermediate material concerning 2nd embodiment of this invention. It is a figure which shows the cross section of the water stop part formed by processing the covering electric wire intermediate material shown by FIG. It is sectional drawing which shows the conventional covered electric wire.

(First embodiment)
A wire harness, a covered electric wire, a method for manufacturing a covered electric wire, and a covered electric wire intermediate material according to a first embodiment of the present invention will be described with reference to FIGS.

  The wire harness 10 of this embodiment is connected to an electronic device or the like installed in a vehicle or the like, and includes a plurality of electric wires including a covered electric wire 20 as shown in FIG.

  The covered electric wire 20 has one water stop part 21 as shown in FIG. The water stop portion 21 is partially provided at a position on the inner side in the longitudinal direction from the end of the covered electric wire 20, and water or the like entering from the end of the covered electric wire 20 is covered by the covered electric wire in the installation environment of the wire harness 10. 20 is prevented from touching. Further, the covered electric wire 20 is formed by processing a covered electric wire intermediate material 30 described later.

  As shown in FIG. 3, the covered electric wire intermediate member 30 includes a plurality of strands 31 and a covering portion 32 that accommodates the plurality of strands 31 inside, and is manufactured by extrusion molding or the like.

  The covering portion 32 is formed in a tube shape using an insulating synthetic resin. The covering portion 32 is configured to be melted by being partially heated and compressed from the periphery of the covering portion 32 in the longitudinal direction of the covering portion 32 so that a part thereof penetrates into the gaps between the plurality of strands 31. . Further, as the insulating synthetic resin constituting the covering portion 32, for example, ethylene-vinyl acetate copolymer resin (Ethylene-vinyl acetate, hereinafter referred to as EVA) can be used.

  Next, a method of manufacturing the covered electric wire 20 using the covered electric wire intermediate material 30 will be described with reference to FIG.

  The manufacturing method of the covered electric wire 20 using the covered electric wire intermediate material 30 includes a heating and compressing step, a water stop portion forming step, and a small diameter portion filling step.

  In the heat compression step, the covered wire intermediate material 30 is cut out to a desired length, and then the covered portion 32 is melted by partially heat-compressing the surrounding portion in the longitudinal direction of the covered portion 32, and the covered portion is melted. In this step, a part of 32 is penetrated into the gaps S of the plurality of strands 31. As shown in FIG. 4, the heat compression process of this embodiment is performed using a pair of heat compression molds 40. The heating compression mold 40 is formed such that the inner shape of the surface 40 a in contact with the covered electric wire intermediate member 30 is slightly smaller than the outer shape of the covered electric wire intermediate member 30. As a result, a part of the melted coating portion 32 is compressed (pressed) toward the center and penetrates into the gaps S of the plurality of strands 31. That is, the inner dimension of the surface 40 a is formed to be a compressible size so that a part of the melted coating portion 32 penetrates the entire gap S between the plurality of strands 31.

  The water stopping part forming step is a step of solidifying the melted coating part 32 by stopping heating to form the water stopping part 21 shown in FIG. As shown in FIG. 6, a small diameter portion 21 a is formed in the processed portion by the heat compression step and the water stop portion forming step.

  The small diameter portion filling step is a step of filling the small diameter portion 21a. For example, a belt-like member (not shown) formed using the same material (for example, EVA) as the covering portion 32 is wound around the small-diameter portion 21a, and heated and melted from the surroundings, so that the outer peripheral surface of the small-diameter portion 21a The band-shaped member can be bonded to fill the small diameter portion 21a.

  According to the present embodiment, the covered electric wire intermediate member 30 includes a plurality of strands 31 and a tube-shaped covering portion 32 made of an insulating synthetic resin in which the plurality of strands 31 are accommodated inside. The covering portion is melted by being partially heated and compressed from the periphery of the portion 32 in the longitudinal direction of the covering portion 32 so that a part of the melted covering portion 32 penetrates into the gaps S of the plurality of strands 31. 32 is configured. From this, by heating and compressing from the periphery of the coating portion 32 and allowing the molten coating portion 32 to penetrate into the gaps S of the plurality of strands 31, the coating portion 32 that has been solidified in the heat-compressed portion is stopped. Water stoppage can be achieved, and water stoppage can be improved by simple processing at a desired position.

  In addition, the covered electric wire 20 is partially heated and compressed from the periphery of the covering portion 32 in the longitudinal direction of the covering portion 32, and the covering portion 32 is melted so that a part thereof penetrates into the gaps S of the plurality of strands 31. Since the water stop part 21 which solidified the coating | coated part 32 fuse | melted after that is provided, water stop can be improved by simple process in a desired position.

  Further, in the covered electric wire 20, the water stop portion 21 is provided at a position on the inner side in the longitudinal direction from the end of the covered electric wire 20. For example, in the conventional covered electric wire 700 shown in FIG. 9, when the airtight portion 702 is provided over the entire longitudinal direction of the covered electric wire 700, a polyethylene compound that forms the airtight portion 702 when processing the terminal is used. It is necessary to connect the terminals after removal. Therefore, a special process for removing the polyethylene compound so that it does not remain at the end of the stranded wire conductor 701 is required, so that there is a problem that workability is poor. On the other hand, since the water-stop portion 21 is not provided at the end of the covered electric wire 20, the covered electric wire 20 can be easily removed by peeling the tube-shaped covering portion 32 covering the plurality of strands 31. Terminal processability can be improved.

  Moreover, since the heat compression process and the water stop part formation process are included, the covered electric wire which improved the water stop at the desired position can be manufactured by simple processing.

  Moreover, since the wire harness 10 is provided with the covered electric wire 20, the water stopping property of the covered electric wire 20 which comprises the wire harness 10 can be improved in a desired position. In addition, since the water stoppage can be improved by simple processing, the waterstop processing can be performed on the line in addition to providing a dedicated processing space / process as before when the wire harness 10 is manufactured.

  In addition, this invention is not limited to the said embodiment, Including other structures etc. which can achieve the objective of this invention, the modification etc. which are shown below are also contained in this invention.

  In the said embodiment, although the water stop part 21 was formed in the longitudinal direction of the covered electric wire 20 (namely, one part), the water stop part of this invention has multiple (namely, several parts in the longitudinal direction of a covered electric wire). ) May be provided. Thereby, it can stop more reliably and can improve the still water reliability of a covered electric wire more. In addition, description of "partial" in this invention includes the meaning of a part and several parts.

  Moreover, in the said embodiment, although the small diameter part filling process was performed in the method of manufacturing the covered electric wire 20, in the covered electric wire manufacturing method of this invention, the small diameter part filling process does not necessarily need to be performed. . Further, when the small diameter portion filling step is not performed, the water stop formed by filling a part of the melted covering portion 32 in the gap S of the covered wire intermediate material 30 by the heat compression step and the water stopping portion forming step. A part becomes hard compared with parts other than the water stop part 21, and the part in which the water stop part 21 was formed in the covered electric wire 20 becomes difficult to bend. Therefore, by forming the water stop portion 21 in accordance with the wiring path of the wire harness 10, the wiring direction of the wire harness 10 can be easily regulated.

(Second embodiment)
A wire harness, a covered electric wire, a method for producing a covered electric wire, and a covered electric wire intermediate material according to a second embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the structure same as the structure described in 1st embodiment, and description is abbreviate | omitted.

  The wire harness (not shown) of this embodiment is connected to an electronic device or the like installed in a vehicle or the like, and includes a plurality of electric wires including a covered electric wire 20A different from the covered electric wire 20 of the first embodiment. ing.

  The covered electric wire 20A has a plurality of water stop portions 21A (see FIG. 8). The water stop portion 21 </ b> A is provided in a part of the covered electric wire 20 </ b> A, and prevents water or the like that has entered from the end of the covered electric wire 20 from passing through the covered electric wire 20. The covered electric wire 20A is formed by processing a covered electric wire intermediate material 30A described later.

  As shown in FIG. 7, the covered electric wire intermediate member 30 </ b> A includes a plurality of strands 31, a covering portion 32 that accommodates the plurality of strands 31 inside, and an outer layer covering that is provided to overlap the entire outer peripheral surface of the covering portion 32. 33A, and is manufactured by extrusion molding or the like.

  The outer layer covering portion 33A is formed using a material having a melting point higher than that of the covering portion 32. Specifically, a polyethylene resin, a polyvinyl chloride resin, or the like having a higher melting point than EVA or the like used for the covering portion 32 is used.

  Next, a method for manufacturing the covered electric wire 20A using the covered electric wire intermediate material 30A will be described.

  The manufacturing method of the covered electric wire 20A using the covered electric wire intermediate material 30A includes a heat compression step, a water stop portion forming step, and a small diameter portion filling step.

  In the heat compression process of the present embodiment, the covered wire intermediate material 30A is cut out to a desired length, and then the covered portion 32 is melted by heating and compressing from the periphery of the outer layer covered portion 33A. Is a step of causing a part of the wire to penetrate into the gaps S of the plurality of strands 31. The heat compression process of the present embodiment is performed by heating to a temperature at which the coating portion 32 melts but the outer layer coating portion 33A does not melt. In addition, the water stop part formation process and the small diameter part filling process are the same as in the first embodiment.

  According to the present embodiment, the covered electric wire intermediate member 30 </ b> A further includes the outer layer covering portion 33 </ b> A made of a material having a higher melting point than that of the covering portion 32. From this, by providing the outer layer covering portion 33A, the outer peripheral surface of the covering portion 32 can be covered with an appropriate material in accordance with the routing environment of the covered wire 20A, and the covered wire 20A that is less likely to deteriorate with time. The covered electric wire intermediate material 30A can be provided.

  In addition, the best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this. That is, the invention has been illustrated and described primarily with respect to particular embodiments, but may be configured for the above-described embodiments without departing from the scope and spirit of the invention. Various modifications can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations.

  Therefore, the description limiting the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such is included in this invention.

DESCRIPTION OF SYMBOLS 10 Wire harness 20, 20A Covered electric wire 30, 30A Covered electric wire intermediate material 21, 21A Water stop part 31 Wire 32 Cover part 33A Outer layer cover part

Claims (7)

A coated wire intermediate material that becomes a coated wire by being processed,
Multiple strands,
A tube-shaped covering portion made of an insulating synthetic resin containing the plurality of strands inside, and
The covering portion is melted by being partially heated and compressed in the longitudinal direction of the covering portion from the periphery of the covering portion, and a part of the melted covering portion penetrates into the gaps of the plurality of strands. A covered electric wire intermediate material characterized by comprising:   The covered electric wire intermediate material according to claim 1, further comprising an outer covering portion made of a material having a melting point higher than that of the covering portion, which is provided so as to overlap the entire outer peripheral surface of the covering portion. A coated electric wire obtained by processing the coated electric wire intermediate material according to claim 1 or 2,
The covering portion that is partially heated and compressed from the periphery of the covering portion in the longitudinal direction of the covering portion to melt the covering portion and infiltrate a part thereof into the gaps between the plurality of strands. A covered electric wire characterized by providing a water stop portion that has solidified the water.   The covered electric wire according to claim 3, wherein the water stop portion is provided at a position on the inner side in the longitudinal direction from the terminal.   The covered electric wire according to claim 3 or 4, wherein a plurality of the water stop portions are provided.   A wire harness comprising the covered electric wire according to any one of claims 3 to 5. A method of manufacturing a covered electric wire by manufacturing a covered electric wire by processing a coated electric wire intermediate material having a plurality of strands and a tube-shaped covering portion made of an insulating synthetic resin containing the plurality of strands inside. There,
A heating and compressing step in which the covering portion is melted by partially heating and compressing the covering portion in the longitudinal direction of the covering portion, and a part thereof penetrates into the gaps of the plurality of strands;
A water stopping part forming step of solidifying the melted covering part to form the water stopping part. A method for manufacturing a covered electric wire, comprising:

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