JP4030779B2 - Electric wire for automobile and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automobile electric wire and a manufacturing method thereof, and more particularly to an automobile electric wire suitable for automated batch connection to a connector and a manufacturing method thereof.
[0002]
[Prior art]
In automobiles, various electric wires are used for electrical connection to electrical components. Among these electric wires, so-called twisted wires used for speakers, audio control circuits, etc. are twisted in pairs with a predetermined twist pitch (for example, about 35 to 45 mm) of two signal wires with insulation coating (discrete wires). The structure is designed to prevent inductive noise. FIG. 1 shows a conventional twisted wire 1. In the figure, reference numeral 2 denotes a signal wire with an insulation coating, which is composed of a conductor 2a and an insulation coating 2b. The size of the cross-sectional area of the conducting wire 2a (hereinafter also referred to as a conductor size) is about 0.3 to 1.25 mm ² .
[0003]
By the way, recently, it has been performed to automate the connection between electric wires and connectors in an automobile wire harness. However, in automating this connection, the twisted electric wire structure shown in FIG. 1 is an obstacle to automation for the following reasons.
First, since the twisted wire has a structure in which two discrete wires are adjacent to each other, it is incompatible with the connector pitch. For example, the distance between conductors having a conductor size of 0.3 mm ² is 1.1 to 1.3 mm, while the connector pitch is 2.0 to 4.0 mm.
Also, when the twisted line is adjusted and cut, the direction of the two discrete lines becomes random, and it is impossible to predict which line will be in the upper, lower, left or right position. That is, the positional relationship between the two discrete lines varies depending on the adjustment and cutting positions.
[0004]
On the other hand, some electric wires for automobiles are provided with a shield member for the purpose of blocking external noise and transmitting a good signal. FIG. 2 shows an example of the structure of a conventional shielded wire.
The conventional shielded electric wire 11 generally has a structure in which a plurality of twisted signal wires 12 and drain wires 13 are covered with a shield layer 14 and further covered with an insulating sheath 15. . The signal line 12 is composed of a conductive wire 12a and an insulating coating 12b covering the periphery thereof.
[0005]
In such a configuration, external noise is shielded by the shield layer 14, and the shielded noise is dropped to the external ground through the drain line 13. Various electrical components are supplied with good signals via the signal line 12.
[0006]
However, in the conventional shielded wire 11 shown in FIG. 2, since the signal wire 12 and the drain wire 13 have a collective twisted wire structure, it is difficult to perform terminal processing (connection with a connector terminal), and it takes time to process the terminal. It was. Moreover, since the stripping length of the insulating sheath 5 and the shield layer 14 is required to be about 80 mm as the terminal processing length, there is a problem that the shielding performance at the terminal deteriorates. Such a structure is also an obstacle to automation in the automation of the connection between the connector and the electric wire.
[0007]
[Problems to be solved by the invention]
An object of the present invention is to solve such problems of the prior art and provide an automobile electric wire (twisted wire) suitable for batch connection by automation to a connector and a method for manufacturing the same.
Another object of the present invention is to provide a flat-type automobile electric wire excellent in shielding performance and suitable for batch connection by automation to a connector, and a method for manufacturing the same.
[0008]
[Means for Solving the Problems]
According to the present invention, the above problem is solved by the following technical means.
(1) A twist portion obtained by twisting two signal wires with insulation coating at a predetermined twist pitch and a non-twist portion formed at an end of the twist portion are alternately provided in the length direction, and the 2 A plurality of sets of signal lines with insulating coatings are arranged in parallel in the horizontal direction, and the non-twisted portion and the long-shaped structure in which a fixing tape is adhered between the twisted portion and the non-twisted portion, A method of manufacturing an automotive electric wire, comprising: manufacturing an automotive electric wire by cutting an appropriate place between each set.
( 2 ) At least one or more in which twist portions obtained by twisting two signal wires with insulation coating at a predetermined twist pitch and non-twist portions formed at the ends of the twist portions are alternately provided in the length direction. One signal line pair is arranged in parallel, and one or more signal line pairs and one drain line arranged in parallel to the signal line pair are arranged in parallel as a set, and a plurality of sets of the signal line pairs are arranged in parallel. A fixing tape including the drain wire is attached to a portion corresponding to the portion between the twisted portion and the non-twisted portion, and a shield member is provided on the twisted portion of the signal line and the portion of the drain wire parallel to the signal wire. A method for producing an automobile electric wire, comprising: producing an electric wire for an automobile by cutting a portion corresponding to the non-twisted portion and an appropriate position between each set with respect to the long structure.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The preferred embodiments of the present invention will be described below.
FIG. 3 schematically shows the structure of an automotive electric wire (hereinafter also referred to as a twisted wire) according to an embodiment of the present invention.
The twisted wire 21 of this embodiment includes a twisted portion 23 obtained by twisting two signal wires 22 with insulation coating at a predetermined twist pitch, and a non-twisted portion 24 formed at an end of the twisted portion 23. By sticking the fixing tape 25 between the twist part 23 and the non-twist part 24, while maintaining the space | interval of the signal wires 22 in a connection end, twist is twisted back. That is, in the non-twist portion 24, the two signal lines (discrete lines) 22 are arranged in parallel to each other. The line-to-line pitch between the conductive wires 22a of the signal line 22 in the non-twisted portion 24 is matched with the pitch of the connector to be connected. The signal line 22 includes a conductor 22a and an insulating coating 22b.
[0010]
The outer diameter of the signal line 22 is appropriately set according to the application, but is usually about φ0.85 to φ0.95 mm. The cross-sectional area (conductor size) of the conducting wire 22a is about 0.13 to 0.22 mm ² . As the conducting wire 22a, various metal / alloy materials such as copper, aluminum, Sn-plated copper and the like can be used, and either a stranded wire or a single wire may be used.
As the insulating coating 22b of the signal line 22, various resin materials such as polyvinyl chloride (PVC), polyethylene (including foamed), halogen-free material, and tetrafluoroethylene can be used. The thickness of the insulating coating 22b is appropriately set according to the conductor size of the conducting wire 22a.
[0011]
Although the twist pitch in the twist part 23 is set to about 35-45 mm, it is not limited to this. Although the length of the twist part 23 is set according to a use, it is about 100-2000 mm normally.
The line pitch between the conductive wires 22a of the signal lines 22 in the non-twisted portion 24 is matched with the connector pitch as described above, but is usually about 2.0 to 4.0 mm. The length of the signal line 22 in the non-twisted portion 24 is about 30 to 40 mm.
[0012]
The upper and lower fixing tapes 25 are attached and connected to the connector in that state, and remain attached after the connection. The width of the fixing tape 25 is about 6 to 162 mm, and the length is about 10 to 30 mm. Adhering with the fixing tape 25 can be performed by a method such as adhesion or fusion by using an adhesive tape. As a material of the fixing tape 25, for example, PET with an olefin adhesive, polyvinyl chloride, PET / polyvinyl chloride, PET / polyolefin resin, or the like can be used.
[0013]
According to the twisted wire 21 having the above structure, the end portion is a non-twisted portion 24, and the pitch between the conductors 22a of the signal wires 22 in the non-twisted portion 24 is equal to the connector pitch to be connected. In addition, since the positional relationship between the signal lines 22 is constant, it is suitable for automating the connection between the electric wire and the connector in the automobile wire harness.
[0014]
Next, a method for manufacturing the twisted wire 21 having the above structure will be described with reference to FIG.
As shown in FIG. 4, a long structure 26 in which twist portions 23 and non-twist portions 24 are alternately formed in the length direction is prepared. The number of combinations of the twist part 23 and the non-twist part 24 can be set to an arbitrary number. In the illustrated example of the structure 26, the four twisted wires 21 are arranged in parallel, but any number can be used. A fixing tape 25 is arranged between the twist part 23 and the non-twist part 24 in the width direction of the twist line 21 as shown in the figure. In this state, after cutting at the cutting line 27, the fixing tape 25 is further cut for each twisted wire 21, whereby a large number of twisted wires 21 can be manufactured at the same time. The order of cutting may be reversed.
[0015]
Next, an automotive electric wire according to another embodiment of the present invention will be described. FIG. 5 is a perspective view showing a structure of an automobile electric wire (hereinafter also referred to as a shielded electric wire) according to the present embodiment.
As shown in FIG. 5, the shielded electric wire 31 of this embodiment is formed at the twisted portion 33 in which two signal wires 32 with insulation coating are twisted at a predetermined twist pitch, and at the end of the twisted portion 33. Two signal line pairs 35 each composed of a non-twisted portion 34 and a drain line 36 are arranged in parallel, and a portion corresponding to a portion between the twisted portion 33 and the non-twisted portion 34 of the signal line pair 35 (seal dress portion) By attaching a fixing tape 37 including the drain line 36, the distance between the conductors 32a of the signal lines 32 and the drain line 36 is maintained, twisting back is prevented, and further, A shield member 38 is provided at a portion of the twist line 34 and the drain line 36 in parallel therewith. That is, in the non-twist portion 34, the four signal lines (discrete lines) 32 and the drain line 36 are arranged in parallel to each other. In the non-twisted portion 34, the pitches between the conductors 32a of the signal lines 32 and the drain lines 36 are matched with the pitch of the connectors to be connected. The signal line 32 includes a conductor 32a and an insulating coating 32b.
[0016]
The outer diameter of the signal line 32 is appropriately set according to the application, but is usually about φ0.85 to φ0.95 mm. The cross-sectional area (conductor size) of the conducting wire 32a is about 0.13 to 0.22 mm ² . As the conducting wire 32a, various metals and alloy materials such as copper, aluminum, Sn-plated copper, etc. can be used, and it may be a stranded wire or a single wire.
As the insulating coating 32b of the signal line 32, various resin materials such as polyvinyl chloride (PVC), polyethylene (including foam), halogen-free material, tetrafluoroethylene, and the like can be used. The thickness of the insulating coating 32b is appropriately set according to the conductor size of the conducting wire 32a.
[0017]
Although the twist pitch in the twist part 33 is set to about 35-45 mm, it is not limited to this. Although the length of the twist part 23 is set according to a use, it is about 100-2000 mm normally. In the present embodiment, the twisted positions of the two signal line pairs 35 are the same, but they may be different from each other, and in this case, the shield characteristics can be further improved.
As described above, the pitch between the conductors 32a of the signal lines 32 and the drain line 36 in the non-twisted portion 34 is the same as the connector pitch to be connected, but is usually about 2.0 to 4.0 mm. The length of the signal line 22 in the non-twisted portion 24 is about 30 to 40 mm, which can be significantly shorter than the conventional shielded electric wire (about 80 mm) shown in FIG.
In the present embodiment, the number of signal line pairs 35 is two, but may be any number of one or three or more depending on the application.
[0018]
The drain wire 36 is made of a metal or alloy material such as annealed copper or Sn-plated copper, and may be a stranded wire or a single wire. The conductor size of the drain line 36 is preferably about 0.22 to 0.3 mm ² .
[0019]
Although the end portions of the fixing tape 37 are not attached to each other in FIG. 5, the fixing tape 37 is actually attached, connected to the connector in that state, and remains attached after the connection. The width of the fixing tape 37 is approximately 6 to 162 mm, and the length is appropriately set according to the number of signal line pairs 35. Methods such as adhesion and fusion by using an adhesive tape can be used. As a material of the fixing tape 37, for example, PET with an olefin adhesive, polyvinyl chloride, PET / polyvinyl chloride, PET / polyolefin resin, or the like can be used.
[0020]
As the shield member 38, a material having a shielding effect is used, but a shield tape is preferably used. Specifically, Sn-plated copper foil PET tape, Sn-plated copper foil / PET tape, aluminum foil / PET tape, and the like can be used as the shield tape, and the thickness is about 15 to 21 μm. The shield tape can be attached using a method such as adhesion or fusion with an adhesive (including a conductive adhesive). The shield member 38 is attached from above and below.
[0021]
According to the shielded electric wire 31 having the above-described structure, the end portion is the non-twisted portion 34 and the seal dress portion, and the conductor wires 32a of the signal lines 32 and the line pitch between the drain wires 36 in the seal dress portion However, since it coincides with the connector pitch to be connected and the positional relationship between the signal lines 32 and the drain line 36 is also constant, it is suitable for automation of the connection between the electric wire and the connector in the automobile wire harness. Become.
Further, since the shield dress portion at the end portion is significantly shorter than the conventional shielded wire shown in FIG. 2, the shield deterioration at the end portion is eliminated, and the shield performance is improved.
[0022]
Next, a method for manufacturing the shielded electric wire 31 having the above structure will be described with reference to FIG.
As shown in FIG. 6A, a plurality of signal line pairs 35 each including two insulation-coated signal lines 32 in which twist portions 33 and non-twist portions 34 are alternately formed in the length direction with respect to the length direction. (Although it is two in the illustrated example, it can be any number.) The drain lines 36 are also arranged in parallel and one set or a plurality of sets (one set in the illustrated example is one set) The long structures 39 arranged in parallel (which can be an arbitrary number of groups) are prepared. The number of combinations of the twist part 33 and the non-twist part 34 can also be made into arbitrary numbers. A fixing tape 37 is arranged in the width direction as shown in the drawing between the twist portion 33 and the non-twist portion 34 and on the drain line 36 corresponding to the position. In this state, cutting is performed at the cutting line 40. If there are a plurality of pairs of signal line pairs 35 and drain lines 36, after cutting at the cutting line 39, the pair is cut. Thereby, many shielded electric wires 31 are obtained simultaneously (FIG.6 (b)). The order of cutting may be reversed.
[0023]
【The invention's effect】
According to this invention, since the said structure and method were employ | adopted, it becomes possible to provide the electric wire for motor vehicles (twist wire) suitable for the batch connection by the automation to a connector, and its manufacturing method.
In addition, according to the present invention, it is possible to provide a flat type automotive electric wire excellent in shielding performance and suitable for batch connection by automation to a connector, and a manufacturing method thereof.
[Brief description of the drawings]
FIG. 1 is a diagram showing a structure of a conventional twisted wire.
FIG. 2 is a cross-sectional view showing the structure of a conventional shielded wire.
FIG. 3 is a diagram illustrating a structure of a twist line according to an embodiment of the present invention.
4 is an explanatory diagram of a method for manufacturing the twisted wire shown in FIG. 2. FIG.
FIG. 5 is a view showing the structure of a shielded electric wire according to another embodiment of the present invention.
6 is an explanatory diagram of a method for manufacturing the shielded wire shown in FIG. 5. FIG.
[Explanation of symbols]
21 Automotive wire (twisted wire)
22 Insulated coating signal wire 22a Conductor wire 22b Insulating coating 23 Twisted portion 24 Non-twisted portion 25 Fixing tape 26 Structure 27 Cutting line 31 Automotive wire (shielded wire)
32 Signal line 32a with insulation coating Conductive wire 32b Insulation coating 33 Twist part 34 Non-twist part 35 Signal line pair 36 Drain line 37 Fixing tape 38 Shield member 39 Structure 40 Cutting line

Claims (2)

  Twisted portions in which two signal wires with insulation coating are twisted at a predetermined twist pitch and non-twist portions formed at the ends of the twist portions are alternately provided in the length direction, and the two insulations are provided. A plurality of sets of signal lines with coatings are arranged in parallel in the horizontal direction, and the non-twisted portion and each set of A method for producing an automobile electric wire, comprising producing an electric wire for an automobile by cutting an appropriate place in between.   At least one signal line in which two twisted signal lines with insulation coating are twisted at a predetermined twist pitch and non-twisted portions formed at the ends of the twisted portions are alternately provided in the length direction. A pair of one drain line is arranged in parallel, and one or more signal line pairs and one drain line arranged in parallel with the pair are arranged in parallel in a horizontal direction, and a twist portion of the signal line pair A long portion in which a fixing tape including the drain wire is attached to a portion corresponding to the non-twisted portion, and a shield member is provided on the twisted portion of the signal line and the portion of the drain wire parallel to the signal wire. A method for producing an automobile electric wire, comprising: producing an automobile electric wire by cutting a portion corresponding to the non-twisted portion and an appropriate position between each set of the structure.

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