JP3971256B2 - Wire Harness - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wire harness formed by bundling a plurality of covered electric wires, and more particularly to a wire harness that reduces the capacitance between adjacent covered electric wires.
[0002]
[Prior art]
In recent years, vehicles such as automobiles are often equipped with a plurality of communication devices. And when connecting these communication apparatuses with a common wire harness, among the covered electric wires included in this wire harness, the first group of covered electric wires connected to a predetermined circuit of the communication apparatus, and this It is necessary to prevent electrical interference between the second group of covered wires connected to another circuit. In order to avoid such interference, it is effective to reduce the capacitance generated between the first group of covered electric wires and the second group of covered electric wires. As a covering material for a covered electric wire, a covering material such as polyethylene having a relative dielectric constant smaller than that of polyvinyl chloride is used instead of a general covering material such as polyvinyl chloride.
[0003]
[Problems to be solved by the invention]
However, a coating material having a low relative dielectric constant such as polyethylene is more expensive than other general coating materials, and the use of a coating material having a low relative dielectric constant is a fraction that depends on the value of the relative dielectric constant. Since the capacitance can only be reduced, particularly when the first group of covered wires and the second group of covered wires are bundled so as to be adjacent to each other, the electrostatic capacitance generated between them is generated. There is a problem that a limit naturally occurs in reducing the capacity.
[0004]
This invention is made in view of such a situation, and provides the wire harness which can make the electrostatic capacitance produced | generated between the covered electric wires which need prevention of mutual interference irrespective of the coating | coated material of a covered electric wire. The purpose is to do.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the invention of claim 1 is a wire harness configured by bundling a plurality of covered electric wires, the first group of covered electric wires connected to a predetermined circuit, and the predetermined circuit second and coated electric wire groups, intervening to coated electric wire of the first group between the coated electric wire of the first of the covering wire and the second group of the group to be connected to another circuit and And the second group of covered electric wires are separated from each other, and the separation member is formed of a cylindrical body made of an insulating material, and the first group of covered electric wires and the second group Any one of the covered wires is disposed inside the cylinder, and the other is disposed outside the tube, and the first group of covered wires and the second group of covered wires Has a bellows structure that forms an air layer between It is characterized in that.
[0006]
According to this configuration, the covered electric wires of one group are arranged inside the cylinder, and the remaining covered electric wires of the other group are arranged outside the cylinder, so that the covered electric wires of both groups are reliably separated. In addition, since an air layer having a very low relative dielectric constant is formed between one group of covered wires and the other group of covered wires, the first group of covered wires and the second group of covered wires are formed. capacitance generated between the covered wire is to be effectively and reliably reduced.
[0007]
For this reason, the covering material of each covered wire can be freely selected without being restricted by the relative dielectric constant, and the cost of the wire harness can be increased by using a relatively inexpensive general material as the covering material. Can be effectively suppressed. Further, when a covering material having a small relative dielectric constant is used, the capacitance between the first group of covered electric wires and the second group of covered electric wires can be further reduced.
[0008]
The invention according to claim 2 is the invention according to claim 1, wherein the separating member has a relative dielectric constant higher than that of any of the covering materials of the first group of covered electric wires and the second group of covered electric wires. It is characterized by being made of a small insulating material .
[0009]
According to this configuration, is generated between the small thing or al and covered wire of the first group covered wire of the second group than the coating material of the covered electric wire groups relative permittivity any of the separating member The capacitance will be reduced more effectively .
[0010]
The invention according to claim 3 is the one according to claim 1 or 2, wherein the separating member is at least a part of the first group of covered wires and the second group of covered wires in the length direction. it is characterized in that it is shall be arranged in the region.
[0011]
According to this configuration, by adjusting the length of the separating member, the capacitance generated between the first group of covered wires and the second group of covered wires can be reduced between the circuits and the like. Only the value necessary for preventing interference can be reduced, and the cost of the wire harness can be effectively reduced. That is, since the capacitance generated between the covered wires is proportional to the length of the covered wires as is well known, it is most preferable to arrange the separation member over the entire length if only focusing on the reduction of the capacitance. Although it is desirable, depending on the specification, there is a case where it is not necessary to reduce the capacitance so much. In this case, if the length of the separating member is saved by arranging the separating member in a part of the covered electric wire, the amount of the separating member used can be minimized while satisfying the necessary capacitance conditions. It can be, Ru can reduce the cost of the wire harness effectively.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an external perspective view of the wire harness according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG. In these drawings, the wire harness 10 covers a conductive wire made of a metal material such as copper with a flexible coating material such as polyvinyl chloride, and a predetermined number of first wires connected to a predetermined circuit of a communication device. A plurality of the covered wires 12 ′ composed of a predetermined number of the second group of covered wires 12 ″ connected to another circuit of the communication device and another circuit of the communication device, and the first of the covered wires 12 A separating member 14 that separates the group of covered wires 12 ′ and the second group of covered wires 12 ″, a tape member 16 that bundles a plurality of the covered wires 12 over the entire length of the covered wire 12, and the covered wires 12 And the connector 18 connected to both ends.
[0013]
In this first embodiment, the separating member 14 is disposed in a partial region in the length direction of the covered electric wire 12 (for example, a length of about one third of the entire length of the covered electric wire 12). And a cylindrical body (tube body) having a bellows structure formed of an insulating material such as a synthetic resin having flexibility. The separation member 14 formed of a cylinder having the bellows structure is called a corrugated tube or a bellows tube made of an insulating material such as polyvinyl chloride, and as shown in FIG. The portions z1 and the recessed portions z2 protruding inward are alternately formed at a predetermined pitch along the length direction. Of the plurality of covered electric wires 12, a first group of covered electric wires 12 'are disposed through the inside of the separating member 14, and a second group of covered electric wires 12 "are arranged outside the separating member 14. The separation member 14 has an insulating material whose thickness is set within a range of, for example, 0.2 to 1.0 mm.
[0014]
The tape member 16 is made of an adhesive tape (harness tape) made of a long insulating material having flexibility, such as polyvinyl chloride, and having an adhesive material applied to the back side thereof. By winding the outer periphery of the covered electric wire 12 between the connectors 18 and the separating member 14 in a spiral manner with a predetermined interval (for example, an interval of the tape width), the plural covered electric wires 12 are prevented from being separated. The position of the separating member 14 on the covered electric wire 12 is fixed.
[0015]
In the wire harness 10 configured as described above, in the region where the separation member 14 is disposed in the covered wire 12, the first group of covered wires 12 ′ which are disposed so as to penetrate through the inside of the separation member 14; The second group of covered electric wires 12 ″ arranged outside the separating member 14 are separated from each other, and the first group of covered electric wires 12 ′ and second adjacent to each other through the separating member 14 are separated from each other. As shown in FIG. 4, the insulating material thickness d1 of the separating member 14 and the gap (air layer) d2 formed between the protruding portion z1 and the depressed portion z2 Thus, a dimension interval is formed.
[0016]
Therefore, in the region where the separation member 14 is disposed, the distance between the conductor of the first group of covered wires 12 ′ and the conductor of the second group of covered wires 12 ″ is not present in the separation member 14. The capacitance formed between the first group of covered wires 12 ′ and the second group of covered wires 12 ″ is more effective than when the separation member 14 is not present. Will be reduced. In FIG. 4, the lead wire of the first group of covered electric wires 12 ′ is indicated by w 1, and the covering material that covers the lead wire w 1 is indicated by m 1. In addition, the lead wire of the second group of covered electric wires 12 ″ is indicated by w2, and the covering material covering the lead wire w2 is indicated by m2.
[0017]
That is, as shown in FIG. 5 (a), when the separation member 14 is not present, the conductor w1 of the first group of covered wires 12 'and the conductor w2 of the second group of covered wires 12''adjacent to each other. The capacitance C per unit length of the covered electric wire 12 generated between the thickness d1 of the covering material m1 of the covered electric wire 12 ′ and the thickness d1 of the covering material m2 of the covered electric wire 12 ″ is d. And the relative dielectric constant of each of the covering materials m1 and m2 is ε, respectively, and the unit length between the conductor w1 of the adjacent first group of covered electric wires 12 ′ and the conductor w2 of the second group of covered electric wires 12 ″ When the opposing area per unit is s, C = εs / d, and the electrostatic capacity over the entire length of the covered wire 12 is proportional to the length of the covered wire 12.
[0018]
On the other hand, as shown in FIG. 5B, when the separation member 14 is present, the conductor w <b> 1 of the first group of covered wires 12 ′ and the second group of covered wires 12 that are adjacent to each other via the separation member 14. The electrostatic capacity C ′ per unit length of the covered wire 12 generated between the lead wire w2 of “″ and the thickness d1 of the covering material m1 of the covered wire 12 ′ and the thickness d1 of the covering material m2 of the covered wire 12 ″. The thickness including the gap of the separating member 14 (the thickness obtained by adding d1 and d2 in FIG. 4) is d ′, and the relative dielectric constant of each of the coating materials m1 and m2 is ε, respectively. For the sake of convenience, the relative permittivity of the separating member 14 is set to ε (actually smaller due to the presence of voids) as the relative permittivity of the coating materials m1 and m2, and the first member of the first group adjacent to each other via the separating member 14 Conductor w1 and second group of covered wire 12 ' C ′ = εs / (d + d ′) where s is the facing area per unit length between the covered wire 12 ″ and the conductive wire w2.
[0019]
For this reason, the capacitance generated between the first group of covered wires 12 ′ and the second group of covered wires 12 ″ corresponds to the thickness d ′ in the region where the separation member 14 exists. Only when the separation member 14 does not exist, the capacitance over the entire length is reduced, and the thickness d ′ of the separation member 14 includes a gap. Since the relative dielectric constant of C is extremely small, the electrostatic capacity C ′ per unit length of the covered electric wire 12 is even smaller than the value obtained by the above formula. When a material having a relative dielectric constant smaller than that of the covering material of the covered wires 12 ′ and 12 ″ is used, static electricity generated between the first group of covered wires 12 ′ and the second group of covered wires 12 ″ is generated. The capacity can be reduced more effectively. To become.
[0020]
In addition, since the mutual position of the covered electric wire 12 and the separating member 14 is fixed by the tape member 16, it is generated between the first group of covered electric wires 12 'and the second group of covered electric wires 12 ". The value of the capacitance to be stabilized becomes stable.
[0021]
6 is an external perspective view of a wire harness according to the second embodiment of the present invention, and FIG. 7 is a cross-sectional view taken along the line BB of FIG. In these drawings, the same reference numerals are used for the same components as those in the first embodiment, and the detailed description thereof will be omitted. In the following, the wire harness 10 according to the first embodiment will be omitted. The difference will be mainly described.
[0022]
That is, the wire harness 10 ′ according to the second embodiment divides the separation member 14 in the first embodiment into two in the length direction, and the two separated separation members 14 ′ are covered with the covered wires. 12 are arranged in a part of the region in the length direction (for example, in the vicinity of the connectors 18 at both ends), and further on the outer periphery of the separating member 14 ′ and the second group of covered electric wires 12 ″ A protective member (harness protective member) 20 is arranged, and the tape member 16 has a predetermined interval (for example, a tape width) on the outer periphery of the covered wire 12 and the protective member 20 between the connectors 18 at both ends. So that the covered wire 12 does not fall apart, and the positions of the separation member 14 'and the protection member 20 on the covered wire 12 are fixed. It is.
[0023]
Each separation member 14 ′ has a bellows structure formed of a flexible insulating material such as polyvinyl chloride as in the first embodiment, and the thickness of the insulating material is, for example, It is set within the range of 0.2 to 1.0 mm. The protection member 20 can be made of an insulating material similar to that of the separation member 14 ', for example. A heat shrinkable tube can also be used as the protective member 20. In this case, since the first group of covered electric wires 12 ′ are bound by the protective member 20, the tape member 16 may be wound only in an area where the protective member 20 does not exist.
[0024]
In the wire harness 10 ′ configured in this way, the first group is provided penetrating into the separation member 14 ′ in two regions of the covered electric wire 12 where the separation member 14 ′ is disposed. Of the first group adjacent to each other via the separating member 14 '. The second group of covered wires 12''arranged outside the separating member 14' are separated from each other. An interval corresponding to the thickness including the gap of the separation member 14 ′ is formed between the covered wire 12 ′ and the second group of covered wires 12 ″.
[0025]
For this reason, as in the case of the first embodiment, the distance between the conductors of the first group of covered wires 12 ′ and the conductors of the second group of covered wires 12 ″ does not exist in the separation member 14 ′. Since this is longer than the case, the capacitance generated between the first group of covered wires 12 ′ and the second group of covered wires 12 ″ is reduced as compared with the case where no separation member 14 ′ is present. Will be. Further, the presence of the protection member 20 protects the covered electric wire 12 at a portion located on the outer periphery of the separation member 14 ′.
[0026]
As described above, the wire harnesses 10 and 10 ′ of the present invention include the first group of covered electric wires 12 ′ connected to a predetermined circuit and the second circuit connected to a circuit different from the predetermined circuit. Separating members 14 and 14 'made of an insulating material are interposed between the group of covered wires 12 "and the first group of covered wires 12' and the second group of covered wires 12" are separated from each other. Therefore, the capacitance generated between the first group of covered wires 12 ′ and the second group of covered wires 12 ″ is reduced.
[0027]
Therefore, the capacitance generated between the first group of covered wires 12 ′ and the second group of covered wires 12 ″ can be reduced regardless of the covering material of the covered wires 12. When an inexpensive coating material having a high relative dielectric constant is used, the material cost can be reduced, and the cost increase of the wire harnesses 10 and 10 'can be effectively suppressed, and a coating material having a high relative dielectric constant is used. In this case, the capacitance generated between the covered electric wires 12 'and 12 "adjacent to each other can be further reduced.
[0028]
In addition, this invention is not limited to the thing of the said 1st and 2nd embodiment, The various deformation | transformation aspects described below can be employ | adopted as needed.
[0029]
(1) In the first embodiment (FIGS. 1 and 2), the separating member 14 is disposed in a region having a length that is approximately one third of the entire length of the covered electric wire 12. It is not limited. For example, you may arrange | position over the full length of the covered electric wire 12, and may arrange | position in the area | region shorter than about 1/3 of the full length of the covered electric wire 12. FIG. In short, since the reduction ratio of the capacitance generated between the first group of covered wires 12 ′ and the second group of covered wires 12 ″ increases with the length of the separation member 14, The length may be set so that the capacitance generated between the one group of covered wires 12 ′ and the second group of covered wires 12 ″ is reduced to a required value. Further, when the separation member 14 is disposed in a partial region as in the first embodiment, the separation member 14 can be divided into a plurality of parts in the length direction.
[0030]
( 2 ) In the first embodiment (FIGS. 1 and 2) and the second embodiment (FIGS. 6 and 7), the tape member 16 is the first group of covered wires 12 'and the second group of covered wires. However, the present invention is not limited to this. For example, the first group of covered wires 12 ′ and the second group of covered wires 12 ″ are respectively separated by separate tape members 16. You may make it wind individually. Furthermore, a configuration in which the tape member 16 is not used is also possible.
[0031]
( 3 ) In any of the above-described embodiments, the covered electric wire 12 is composed of the first group of covered electric wires 12 'and the second group of covered electric wires 12 ", but is not limited thereto. Further, there may be a third group of covered wires connected to another circuit, in which case the groups of covered wires may be separated from each other by the separating members 14, 14 '.
[0032]
( 4 ) In any of the above-described embodiments, the covered electric wire 12 is configured using a material having a relatively high relative dielectric constant such as polyvinyl chloride as the covering material, but is not limited thereto. For example, it may be configured using a material having a relatively low relative dielectric constant such as polyethylene. In this case, the coating material is relatively expensive, but in order to reduce the capacitance value to a certain value, the coating material should be made thinner than the coating material having a large relative dielectric constant by a smaller relative dielectric constant. Therefore, the material cost is suppressed, and the cost increase of the wire harness 10, 10 'can be effectively suppressed.
[0033]
【The invention's effect】
As described above, according to the invention of claim 1, the coating of the second group and the coated electric wire of the first group to be connected to a predetermined circuit, the circuit of Jo Tokoro that is connected to another circuit An electric wire and a separating member that is interposed between the first group of covered wires and the second group of covered wires and separates the first group of covered wires and the second group of covered wires from each other. The separating member is made of a cylinder formed of an insulating material, and one of the first group of covered electric wires and the second group of covered electric wires is disposed inside the cylinder, and the other is a cylinder. is disposed outside the body, and, der those having covered wire of the first group and the bellows structure to form an air layer between the coated electric wire of the second group Runode, covering the first group very small relative dielectric constant between the electric wire and the covering wire of the second group The electrostatic capacitance generated between the covered wire supposed to have voids mediated can be reliably reduced.
[0034]
For this reason, the electrostatic capacity generated between the first group of covered wires and the second group of covered wires that need to prevent mutual interference should be reduced regardless of the relative dielectric constant of the covering material of the covered wires. In the case where an inexpensive coating material having a large relative dielectric constant is used, the material cost is suppressed and the cost increase of the wire harness can be effectively suppressed. In addition, when a covering material having a small relative dielectric constant is used, the capacitance generated between the adjacent covered electric wires can be further reduced.
[0035]
According to the invention of claim 2, since the separating member is made of an insulating material having a relative dielectric constant smaller than any of the covering materials of the first group of covered wires and the second group of covered wires, Capacitance generated between the first group of covered wires and the second group of covered wires can be more effectively reduced.
[0036]
Further, according to the invention of claim 3, since the separation member is shall be arranged in at least a portion of the area in the length direction of the covered wire of the first group of the covered wires and the second group, the Capacitance generated between one group of covered wires and the second group of covered wires can be reduced by a value necessary to prevent electrical interference between circuits, etc. usage is suppressed effectively can FIG Rukoto cost down.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a wire harness according to a first embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view taken along line AA of the wire harness shown in FIG.
FIG. 3 is a side view of a separating member used for the wire harness shown in FIGS.
4 is a cross-sectional view of a covered electric wire for explaining the capacitance generated between the adjacent covered electric wires of the wire harness shown in FIGS. 1 and 2. FIG.
5 is a cross-sectional view of a covered electric wire for explaining the capacitance generated between adjacent covered electric wires of the wire harness shown in FIGS. 1 and 2, and (a) is a separation member between adjacent covered electric wires. (B) is a figure when a separating member exists between adjacent covered electric wires.
FIG. 6 is an external perspective view of a wire harness according to a second embodiment of the present invention.
7 is an enlarged cross-sectional view taken along line BB of the wire harness shown in FIG. 6. FIG.
FIG. 8 is an external perspective view of a separation member having another configuration used for a wire harness.
[Explanation of symbols]
10, 10 'Wire harness 12 Coated wire 12' First group of covered wires 12 "Second group of covered wires 14, 14 ', 14" Separating member 16 Tape member 18 Connector

Claims (3)

A wire harness configured by bundling a plurality of covered electric wires, the first group of covered electric wires connected to a predetermined circuit, and the second group of electric wires connected to a circuit different from the predetermined circuit A separating member that is interposed between the covered electric wire and the first group of covered electric wires and the second group of covered electric wires and separates the first group of covered electric wires and the second group of covered electric wires from each other. And the separation member is formed of a cylindrical body formed of an insulating material, and one of the first group of covered electric wires and the second group of covered electric wires is arranged inside the cylindrical body. The other is disposed outside the cylindrical body, and has a bellows structure that forms an air layer between the first group of covered electric wires and the second group of covered electric wires. Waiyahane, characterized in that there . The separating member according to claim 1, Symbol, characterized in that is made of a small insulating material having a relative dielectric constant than either of the coating material of the coated electric wire of the first group of the covered electric wire and the second group The listed wire harness. The said separating member is arrange | positioned in the at least one part area | region in the length direction of the said 1st group covered electric wire and the said 2nd group covered electric wire, The Claim 1 or 2 characterized by the above-mentioned. serial mounting of the wire harness.

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