JPS61268543A - Harness support device - Google Patents

Abstract

PURPOSE:To absorb all high-frequency noises as transmitted to a harness and prevent noise input into each electronic component by arranging a strong magnetic part and a good conductive part side by side in an axial direction at the harness holding part of a harness support device for each signal transmission of a car. CONSTITUTION:A harness support device 10 sandwitches an auto speed control harness in such a way that its clip 13 is screwed to a harness fixing part 21 formed on a body panel 20. Said fixing part 21 has a concave portion 21a wherein a strong magnetic part 12 and a good conductive part 14 are arranged via an elastic material 11 against a vibration. Said strong magnetic part 12 and good conductive part 14 form a solid semi-cylinder and cover half the periphery of the auto speed control harness. The clip 13 is also formed to be a semi-cylinder and has a strong magnetic part 15 and a good conductive part 16 within the thickness of its retainer 24 with a fitting piece 23 at both sides. The chip 13 so formed is connected to the panel 20 via a screw 26.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a harness support device that fixes various signal transmission harnesses of an automobile and at the same time functions as a high frequency noise filter.

BACKGROUND OF THE INVENTION Automobiles are generally equipped with electronic devices such as radio receivers, wireless devices, and electronically controlled fuel injection devices. Since these devices are operated by high-frequency signals, they are adversely affected by high-frequency noise generated from various switches such as ignition system voltage regulators and horn relays, causing radio noise and device malfunctions. There was a problem.

Conventionally, in order to suppress the high-frequency noise, a noise preventer such as a bypass capacitor is installed at the source of the noise to prevent the noise from occurring, or an inductance is installed at the input terminal of each electronic device that is affected by this noise. Countermeasures have been taken, such as installing a high-frequency noise filter using an element or a capacitor element, and even inserting a lead wire that becomes a signal line into a ferrite bead for noise reduction.

<Problems to be Solved by the Invention> However, in such conventional technology, noise reduction means are individually provided for each noise source, each input terminal of each electronic device, or each signal line, so the number of components is significantly reduced. In addition to this, there are problems in that the structure becomes complicated and the assembly process becomes complicated.

Means for Solving the Problems In view of the above-mentioned problems, the present invention provides a method in which the signal transmission harnesses connecting the electronic devices and their attached devices are usually bundled together in a plurality of harnesses. Focusing on fixation to the vehicle body by a harness support device, the present invention is characterized in that a ferromagnetic portion and a highly conductive portion are arranged side by side in the axial direction at the harness mounting portion of the harness support device.

Effect〉 High frequency noise added to each signal transmission harness.

It is absorbed all at once by the harness support device, and input to each electronic device is prevented.

Embodiment> FIG. 1 shows a harness support device 10 according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view showing the assembly, and FIG. 2 is a sectional view showing the assembled state.

The harness support device 10 according to this embodiment includes, for example, a third
It is installed on the dash side of a car as shown in the figure. That is, on this dash side, a fuse box 1, an auto speed control unit 2 for controlling vehicle speed, etc. are arranged, and an auto speed control harness 3 is installed to connect these with various sensors, controlled devices, etc. ．． Instrument harness 4. Room lamp harness5. Air conditioner/audio harness 6
etc. are wired in a suitably bundled form together with a body harness 7 extending from the front and rear of the vehicle.

In the illustrated example, the harness support device 10c, il
[The auto speed control harness 3 is fixed to the vehicle body near the auto speed control unit 2.

Support this harness! ti110 is hM1 As shown in FIG.
A clip 13 is screwed to the holder to hold the auto speed control harness 3.

The harness mounting portion 21 is configured to fit a ferromagnetic portion 12 into a recess 21a having a semicircular cross section formed in the vehicle body panel 20 along the harness installation direction via a vibration isolating elastic material 11. A good conductive part 14 is arranged.

The ferromagnetic portion 12 is formed of a hard ferrite material or the like into a semi-cylindrical shape, and is disposed with its inner surface exposed to the outside, that is, to the clip 13 side.

Further, the good conductive part 14 is made of metal, and the ferromagnetic part 1
It is formed in a semi-cylindrical shape of approximately [Wl-] and is disposed continuously on the ferromagnetic part 12 with its inner surface exposed to the clip 13 side. That is, the ferromagnetic portion 12
The conductive part 14 forms an integral semi-cylindrical body and covers half the circumference of the auto speed control harness 3. The vibration-proofing elastic material 11 is made of a conductive rubber material or the like. It's getting better.

The ferromagnetic portion 12, the conductive portion 14, and the vibration-proofing elastic material 11 are strongly fixed to the recess 21a with an adhesive.

On the other hand, the clip 13 is formed in a semi-cylindrical shape.

A semi-cylindrical body consisting of a ferromagnetic part 15 and a good conductive part 16 as shown in FIG. 4 is integrally mounted inside the holding body 24 which has pieces 23 on both sides. The portion 15 is made of a hard ferrite material or the like formed in a semi-cylindrical shape similar to the ferromagnetic portion 12 on the vehicle body side described above,
Further, the good conductive portion 16 is also made of metal and has a semi-cylindrical shape, similar to the good conductive portion 14 on the vehicle body side.

The holding body 24 is made of synthetic resin,
It is formed by integral molding with a ferromagnetic part 15 and a highly conductive part 16 arranged inside.

Further, as shown in FIG. 2, a conductive film 25 is integrally interposed and disposed inside the holder 24 in close contact with the outer peripheral surface of the well-conductive portion 16 during molding. The conductive film 25 is extended to the tip of the piece 23 at the attachment point.

This attachment comes into contact with a set screw 26 inserted into a screw insertion hole 23a formed in the piece 23, and is connected to the vehicle body panel 20 via this set screw 26.

The thickness of the inner peripheral portion of the holder 24 is made as thin as possible within a range in which the ferromagnetic portion 15 and the ferromagnetic portion 41 can be securely fixed.

When the thus formed clip 13 is screwed onto the single panel 20 as shown by the second tooth, the ferromagnetic portion 12
The ferromagnetic portion 15, the good conductive portion 14, and the good conductive portion 16 are arranged in alignment with each other in the axial direction. As a result, the auto speed control harness 3 is inserted into the coaxial cylindrical ferromagnetic part 12.15 and the conductive part 14.16, and the harness attachment part 21 of the vehicle body and the clip 1.
3 and fixed to the vehicle body.

and a harness support device 10 configured as one or more
functions as a high frequency noise filter with an equivalent circuit as shown in FIG. That is, the ferromagnetic portions 12.15 form an annular magnetic path.

It functions as a coil 27 against multi-frequency noise and increases noise loss due to interface components. The conductive portions 14 , 16 also form a bypass magnetic path to the vehicle body panel 20 that corresponds to the function of the conventional capacitor 28 .

As a result, high frequency noise applied to the auto speed control harness 3 is absorbed by the harness support device 10.

Further, in the above embodiment, C, each pair of ferromagnetic portions 12°15
and the one equipped with the good conductive parts 14 and 16 was described,
As shown in FIG.
The ferromagnetic portions 12 and 15 may be arranged respectively. According to this configuration, the function of an L-CL T-type noise filter can be obtained, as shown in the equivalent circuit shown in Figure #g7.

FIG. 8 shows another example of the arrangement of the harness support device 10 having such a configuration. In fig.

A body harness 29 is wired across the front and rear directions of the vehicle body. The body harness 29 includes a harness connected to electrical equipment such as a rear combination lamp installed in the trunk room, a defogger harness connected to a defogger installed in the rear window, and the like. Further, a handbrake harness 30 is branched from the body harness 29 and connected to a handbrake 31. Note that 32 represents a console box and 33 represents a door.

The harness support device 1110 is disposed at two locations before and after the body harness 29 and at one location in the middle of the handbrake harness 30, and fixes the valley harnesses 29 and 30 to the vehicle body, respectively.

Here, as shown in FIG. 7, the input impedance Zi
Even in the case of the unit load 40 having an input circuit with a small n, the bypass effect by the common capacitor function of the well-conducting portions 14 and 16 works effectively. For example, even in the case of a defogger whose input impedance Zin is as small as several tens of ohms, noise superimposed on the defogger harness can be effectively removed and prevented from entering the defogger.

By the way, although it is not shown in the diagram, the defogger harness is normally wired a long distance from the defogger located on the rear window to the battery via a changeover switch installed in the driver's seat, so it is connected to the ignition system and various motors. etc. noises are likely to be superimposed. Particularly in vehicles equipped with an antenna on the rear window, noise propagated to the defogger is electrostatically coupled to the antenna, producing radio noise. However, such radio noise can also be removed from the harness support device 10 as described above.
This can be prevented by

In addition, in the embodiment, the vehicle body panel 20 and the clip 13
As described above, the structure is such that the harness is held between the body panel 20 and the body panel 20.
It may also be one that is attached to. In other words, in this case, the noise filter can be constructed by arranging the above-described ferromagnetic part and the highly conductive part in the parts that are folded together and sandwich the harness.

<Effects of the Invention> According to the present invention, high frequency noise can be reduced all at once using a signal transmission harness corresponding to a plurality of signal lines, compared to the case where a noise reduction means is provided for each 4FI line. , the number of parts can be significantly reduced. Also,
No special installation work for noise reduction means is required for noise countermeasures, and noise reduction can be achieved at the same time by handling the clip in the same way as a normal clip.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing a harness support device according to an embodiment of the present invention, Fig. 2 is a sectional view showing the assembled state of the harness support device shown in Fig. 1, and Fig. 3 is an arrangement of the harness support device. A schematic perspective view explaining an example, FIG. 4 is a perspective view showing a ferromagnetic part and a good conductive part incorporated in the clip, and FIG.
FIG. 6 is an exploded perspective view showing a harness support device according to another embodiment of the present invention, and FIG. 7 is a diagram showing both circuits of the harness support device shown in FIG. FIG. 8, which is a diagram showing the circuit, is a schematic perspective view illustrating another arrangement example of the harness support device. 3...Auto speed control harness, 10.
...Harness support device, 12.15...Ferromagnetic part, 1
3...Clip, 14.16...Good conductive part, 20.
...Vehicle body panel, 21...Harness attachment part, 29...
・Body harness, 30...Handbrake harness. Patent Applicant Nissan Motor Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 1゜

Claims (1)

[Claims] A harness support device in which a transmission harness is clamped and held approximately coaxially by a clip attached to a vehicle body or by this clip and a vehicle body, and the clamping portion includes a ferromagnetic part and a highly conductive part. A harness support device characterized by being arranged side by side in the axial direction.