JP2007250286A - Wire harness - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wire harness which reduces an influence of an electromagnetic wave. <P>SOLUTION: A power supply wire 2 and an earth wire 3 are placed side by side on a bench exclusive for the wire harness, a designated zone L1 is set for the power supply wire 2 and the earth wire 3 placed side by side, and also an additional length 13 is given to the earth wire 3 in the set and designated zone L1. After the additional length 13 is formed, tape wrapping 14 is applied to locations on both sides of the designated zone L1. Then, the additional length 13 is removed from a wiring fixture 12a and is wound around the power supply wire 2. The additional length 13 is wound around so as to keep a mountain shape, and the top part is lastly wound. A tape wrapping 15 is applied to the location of the top part of the additional length 13 to form a countermeasure portion 4 against electromagnetic noise. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wire harness, and more particularly to a wire harness having an electromagnetic noise countermeasure portion in a designated section.

A moving body such as an automobile is provided with a wire harness through which a large current flows. As this wire harness, there is a circuit for an air conditioner, for example, and it is routed on the back side of the instrument panel. In recent years, many instrument panels are equipped with a navigation system (for example, see Patent Document 1). The distance between the air conditioning circuit on the back of the instrument panel and the navigation system is not so wide.
JP 2000-62451 A

  When a large current flows through the wire harness, a large magnetic field is generated according to this current. For example, when a device including a compass sensor is present near the wire harness, the compass sensor is affected by electromagnetic waves. It will be. This will be particularly noticeable in areas where the geomagnetic force is weak.

  As a countermeasure, it is conceivable to keep the wire harness through which a large current flows away from the compass sensor, but it is difficult to realize this in terms of space on the back side of recent instrument panels. As another countermeasure, a shield member such as an iron plate may be provided on the compass sensor side. However, since the design change and the degree of freedom of design are taken away and the cost is increased, the above countermeasures are taken. Similarly, it is difficult to realize.

  This invention is made | formed in view of the situation mentioned above, and makes it a subject to provide the wire harness which can reduce the influence of electromagnetic waves.

  The wire harness of the present invention according to claim 1, which has been made to solve the above-described problem, has a power supply line and a ground wire arranged side by side, and the power supply line and the ground wire are arranged in a designated section of the power supply line and the ground line arranged in parallel. One of these is provided with a surplus length and either one of the above is wound around the other, or the power supply line and the ground line are twisted in the designated section.

  According to the present invention having such characteristics, the electromagnetic force wheel is reduced in the designated section. That is, due to winding or twisting in the designated section, the distance between the power line and the ground line is reduced, or the power line and the ground line are in close contact with each other, and the harness diameter is smaller than the harness diameter outside the designated section. This reduces the ring of electromagnetic force. Further, it becomes possible to further cancel the electromagnetic force ring by winding or twisting. The present invention is particularly useful when it is difficult to move the wire harness away from a device that is susceptible to electromagnetic waves.

  A wire harness according to a second aspect of the present invention is characterized in that, in the wire harness according to the first aspect, the power supply line and the ground line in the designated section are brought into close contact with each other by tape winding. Moreover, the wire harness of this invention of Claim 3 makes the harness diameter of the said designated area smaller than the harness diameter of the harness trunk line other than the said designated area in the wire harness of Claim 1. It is a feature.

  According to the present invention having such a feature, the electromagnetic force wheel in the designated section is surely smaller than the harness trunk line other than the designated section.

  According to the first aspect of the present invention, there is an effect that the influence of electromagnetic waves can be reduced. Further, according to the present invention described in claims 2 and 3, there is an effect that the ring of electromagnetic force can be further reduced.

  Hereinafter, description will be given with reference to the drawings. 1A and 1B are schematic views showing an embodiment of a wire harness according to the present invention. FIG. 1A is an overall view of the wire harness, and FIG. 1B is an enlarged view of a main part of the wire harness. Moreover, FIG. 2 is explanatory drawing regarding a harness diameter and magnetic flux, (a) is explanatory drawing corresponding to the wire harness of this invention, (b) is explanatory drawing of a comparative example. Furthermore, FIG. 3 is explanatory drawing regarding the wheel of electromagnetic force, (a) is explanatory drawing corresponding to the wire harness of this invention, (b) is explanatory drawing of a comparative example.

  In FIG. 1, reference numeral 1 indicates a wire harness according to the present invention. The wire harness 1 includes a power line 2 (WH (+ line) in the figure) and a ground line 3 (WH (− line) in the figure) (only the main harness is shown). Other harness settings are optional). The wire harness 1 is not particularly limited. For example, the wire harness 1 is an air conditioner circuit (blower circuit) arranged behind the instrument panel, and a large current flows through the power line 2. The power supply line 2 and the ground line 3 are arranged side by side at a predetermined interval, and only the designated section L1 has a pseudo twist state, that is, an electromagnetic noise countermeasure portion 4.

  The wire harness 1 is characterized in that a designated section L1 is set and an electromagnetic noise countermeasure portion 4 in a pseudo twist state is provided here. Moreover, the structure itself of the electromagnetic noise countermeasure part 4 is also a feature.

  The designated section L1 has a range corresponding to a device 5 (such as a navigation system including a compass sensor) that is provided on the instrument panel and is easily affected by electromagnetic waves. The interval L2 between the electromagnetic noise countermeasure portion 4 and the device 5 remains the conventional interval (in other words, the problem can be solved even if the conventional interval remains).

  In FIG. 1 thru | or FIG. 3, the electromagnetic noise countermeasure part 4 winds the earth wire 3 around the power wire 2 in the designated area L1 (the reverse may be sufficient). In the electromagnetic noise countermeasure part 4, the power line 2 and the ground wire 3 are in close contact with each other, and the harness diameter of the harness main line in which the harness diameter of the electromagnetic noise countermeasure part 4 is other than the designated section L1 (the broken line 6 in the figure is the harness main line). It is set to be sufficiently smaller than the outer diameter.

  Here, the comparison between the electromagnetic noise countermeasure part 4 and the comparative example will be described with the broken line 6 in the figure as the outer diameter of the harness trunk line, the arrow 7 as the current direction, and the reference numeral 8 as the direction of the magnetic flux. The comparative example has a comparative power supply line 9 and a comparative ground wire 10 that are routed so as to form the outer diameter 6 of the harness trunk line in each figure (b). The comparison power supply line 9 and the comparison ground line 10 are in a non-twisted state as with the harness trunk line.

  As can be seen from FIGS. 1 to 3, the electromagnetic noise countermeasure portion 4 is formed so that the power line 2 and the ground line 3 are in close contact with each other (so that the distance between the power line 2 and the ground line 3 is reduced). Therefore, the range of influence of the electromagnetic force 11 due to the ring 11 is smaller than that of the comparative example (see FIG. 3). Further, since the electromagnetic noise countermeasure portion 4 is formed in a pseudo twist state, the electromagnetic force ring 11 is canceled out. Therefore, the electromagnetic noise countermeasure part 4 can reduce the influence of electromagnetic waves.

  Next, the manufacture of the wire harness 1 including the electromagnetic noise countermeasure portion 4 will be described with reference to FIG. 4A is a schematic explanatory diagram of the first step, FIG. 4B is a schematic explanatory diagram of the second step, and FIG. 4C is a schematic explanatory diagram of the third step. In addition, the some black circle in the figure has shown the wiring jig 12 (hawk member etc.) of the work harness exclusive work table.

  In the first step, the power supply line 2 and the ground wire 3 are arranged on the work harness dedicated work table, a designated section L1 is set for the arranged power supply line 2 and the ground line 3, and further, in the set designated section L1 In this process, the ground wire 3 has a surplus length 13. In this embodiment, as shown in FIG. 4A, the extra length 13 is formed by pulling out the ground wire 3 and passing it through the routing jig 12a (assumed as an example). The first step is also a step of tape winding 14 at the positions on both sides of the designated section L1 when the extra length 13 is formed.

  The second process is a process in which the extra length 13 is removed from the routing jig 12 a and wound around the power supply line 2. The extra length 13 is wound in such a manner that the top portion is wound at the end so as to maintain the shape of the mountain in FIG. 4A (this winding method is an example). The pitch width L3 may be designated or non-designated).

  The third step is a step of applying tape winding 15 to the position of the top of the extra length 13. By applying the tape winding 15, the extra length 13 is prevented from being scattered. When the tape winding 15 is applied, the electromagnetic noise countermeasure portion 4 is formed and the production of the wire harness 1 is completed.

  The electromagnetic noise countermeasure portion 4 may be formed as shown in FIGS. 5 (a) and 5 (b). In FIG. 5A, the electromagnetic noise countermeasure part 4 is formed by twisting the power line 2 and the ground line 3 in a regular manner. Further, in FIG. 5B, the electromagnetic noise countermeasure portion 4 is formed by applying the tape winding 16 over the entire designated section L1 (or most of the designated section L1). In these two cases as well, the harness diameter becomes small in the designated section L1, so the ring of electromagnetic force becomes small and the same effect as described above can be achieved.

  In addition, it goes without saying that the present invention can be variously modified without departing from the spirit of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows one Embodiment of the wire harness of this invention, (a) is a general view of a wire harness, (b) is a principal part enlarged view of a wire harness. It is explanatory drawing regarding a harness diameter and magnetic flux, (a) is explanatory drawing corresponding to the wire harness of this invention, (b) is explanatory drawing of a comparative example. It is explanatory drawing regarding the ring | wheel of electromagnetic force, (a) is explanatory drawing corresponding to the wire harness of this invention, (b) is explanatory drawing of a comparative example. It is typical explanatory drawing about manufacture of a wire harness, (a) is explanatory drawing of a 1st process, (b) is explanatory drawing of a 2nd process, (c) is explanatory drawing of a 3rd process. It is a schematic diagram which shows the other example of the electromagnetic noise countermeasure part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wire harness 2 Power line 3 Ground wire 4 Electromagnetic noise countermeasure part 5 Equipment 6 Outer diameter of harness trunk line 7 Current direction 8 Magnetic flux direction 9 Power supply line for comparison 10 Ground wire for comparison 11 Wheel of electromagnetic force 12 Routing jig 13 Extra length 14-16 Tape winding L1 Specified section L2 Interval between electromagnetic noise countermeasure part and equipment L3 Pitch width when winding

Claims (3)

A power line and a ground line are arranged, and in the specified section of the power line and the ground line, either one of the power line or the ground line has a surplus length, and either one of the power line and the ground line is set to the other. A wire harness that is wound or twisted between the power line and the ground line in the designated section. The wire harness according to claim 1,
The wire harness, wherein the power supply line and the ground wire in the designated section are closely attached by tape winding. The wire harness according to claim 1,
The wire harness characterized by making the harness diameter of the said designated area smaller than the harness diameter of the harness trunk line other than the said designated area.

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