JPS6339460B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wiring harness wiring method,
This is intended to prevent the generation of radio noise, especially in vehicles equipped with a rear differential camera and a radio antenna.

[Conventional technology]

Since vehicles generally have many sources of radio noise, various measures have been taken, such as incorporating noise prevention equipment into each device that is a source of noise radio waves.

Particularly in recent years, when car radios have become indispensable accessories for vehicles, if the performance of the radio is hampered by such noise, it will also affect the commercial value of the vehicle itself, so measures to suppress radio wave noise have traditionally been implemented. Various studies have been conducted for this purpose.

First, a conventional wire harness wiring method will be described.

FIG. 6 shows a schematic diagram of the wiring at the rear of the trunk of the vehicle. A trunk main harness 2 is arranged on the body panel side of the trunk 1, and includes rear combination lamp harnesses 3R, 3L, stop tail sensor harness 4, and license lamp harness 5, respectively.
is branched from trunk room main harness 2.

And rear combination lamp 6R, 6
L, the license lamp 7 is grounded to the body panel 8 by a body ground harness 7A.

Figure 7 shows rear combination lamp 6R,
The wiring diagram of 6L is shown, and 8A is the ground line of rear combination lamps 6R and 6L, which shows the ground line using the body panel.

Incidentally, the battery mounted on vehicle B, 9, is a switch circuit including an ignition switch, a turn signal switch, a hazard switch, an ignition relay, and a flasher unit. Also, 19R,
19L is a side combination lamp.

FIG. 8 shows a layout diagram of a rear parcel in front of the trunk of a vehicle having a whip antenna in the rear fender.

In this part, the body harness 11, which is the main harness from the body, is located below the rear parcel. The body harness 11 includes a speaker harness 12 that connects to rear speakers 10R and 10L below the rear parcel, harnesses 45 and 45L that connect to the rear differential gear, and a trunk room lamp 14.
A wire harness 15 and a trunk room lamp switch harness 16 are branched off.

Furthermore, a tank unit gauge harness 17 is branched from the trunk main harness 2 at the trunk room side part. Power antenna motor harness 1 from speaker harness 12
8 are branched.

FIG. 9 shows a wiring diagram of the right side of the dash. Here, the instrument harness 2
1, room lamp harness 22, fuse box 23, time control unit 2
4. There are an automatic door lock timer unit 25 and a power window timer unit 26.

On the right side of the dashboard, the main harness 20 branches into an instrument harness 21, a room lamp harness 22, various harnesses connected to each unit, and an air conditioner/audio harness 27, which are connected to electrical equipment installed at the rear of the vehicle. This is body harness 11.

FIG. 10 shows an example of a body harness wired on the side of the body. As shown in the figure, all the body harnesses 11 are bundled together,
The wires are laid out on the body panel 8.

In this body side part, body harness 11
A handbrake harness 30 and a seatbelt harness 31 are branched from there. Here, 32 is a handbrake, 33 is a console box, and 34 is a
indicates a door.

Figures 11 and 12 show an example of conventional wire harness wiring for a vehicle that has a rear differential camera and a radio antenna on the rear window. Figure 11 shows the wiring as seen from the seat side toward the rear window of the vehicle. FIG. 12 shows the wiring state looking down at the rear of the vehicle from above the rear parcel tray panel.

Hereinafter, in explaining the wiring configuration of this wire harness, the wiring will be divided into two types and explained.

In other words, the thick solid lines indicate the wiring connected to the radio antenna and the rear differential camera-related equipment, and the thick broken lines indicate the radio and rear differential camera-related wiring arranged on the back side of the shield when viewed from the viewpoint. shall be. In addition, two parallel solid lines indicate wiring connected to lights, lamps, speakers, motors, air purifiers, etc., and two parallel broken lines indicate wiring connected to the back side of the shield as seen from the viewpoint. The wiring diagram for these lights, etc. is shown below.

In FIG. 11, 41 is a radio antenna, and 42 is a rear differential camera. These multi-wire radio antenna 41 and rear differential gear 42
are printed with conductors on the vehicle interior side of the rear glass 43 on the rear surface of the vehicle, and are connected to defogger power supply terminals 44R and 44L provided on both sides of the rear glass 43, respectively.

The reason why the radio antenna 41 is electrically integrated with the rear defogger 42 in this way is to improve the sensitivity of the radio antenna 41 in the AM band by also using the rear defogger 42 as an antenna.

Note that in FIG. 11, AT is an antenna output terminal, which is connected to an in-vehicle radio via a shielded wire (not shown).

Here, the wire harness 45R connected to the defogger power supply terminal 44R is guided to the right (left side of the vehicle) along the upper surface of the rear parcel tray panel (hereinafter simply referred to as "tray panel") 46, and is connected to the defogger power supply terminal 44L. An inductor filter 4 for reducing high frequency noise is provided at the bottom of the tray panel 46 along with the connected wire harness 45L.
Guided by 7. From here, the two wire harnesses 45R and 45L are combined to form a wire harness 45, which is wired along the lower rear portion of the tray panel 46 toward the right side of the vehicle together with other wire harnesses.

48 is a defogger sensor attached below the rear defogger 42. The rear defogger 42 is turned on and off based on the sensor signal detected by the defogger sensor 48. Wire harness 49 connected to both terminals of rear differential sensor 48
R and 49L each pass through the tray panel 46 and then form a wire harness 50 together with the wire harness 45 described above on the lower surface side thereof.

In the following explanation, these defogger-related wire harnesses 45R, 45L, 45, 49R,
49L and 50 are collectively referred to as a defogger wire harness.

In addition, in FIGS. 11 and 12, 10
R and 10L are both rear speakers, 14 is a trunk lamp, and 51 is an air cleaner. 6
R and 6L are rear combination lamps installed on the left and right sides of the rear end of the vehicle, respectively.

Wire harnesses 12R and 12L connected to rear speakers 10R and 10L, and wire harnesses 15 and 5 connected to trunk room lamp 14 and air cleaner 51, respectively.
2 are bundled at the rear of the lower surface of the tray panel 46,
The wire harness 53 is sequentially bundled together with the wire harness 50 described above.

Here, in FIG. 11 and FIG. 12, the hatched portion of the line representing the parallel wire harnesses shows the state of the combined wire harness wiring.

Next, wire harnesses 3R and 3L connected to rear combination lamps 6R and 6L
The two wires are guided as one toward the rear right side wall of the vehicle toward the tray panel 46, and then
It is combined with the wire harness 53 on the lower surface to form a rear main harness 54, and is wired with the upper surface of the rear seat back body panel 8B facing the front of the vehicle to form the body harness 11 shown in FIG.

Note that, among the wire harnesses forming the rear main harness 54, the defogger sensor 4
Wire harnesses 49R and 49 connected to 8
In L, a defogger sensor amplifier 55 is interposed in the middle of the wiring of the rear main harness 54.

In addition, in the following explanation, the wire harnesses 3R, 3L, 12R, 12 connected to electrical components are
When L, 15, and 52 are collectively referred to as an electrical wiring harness.

[Problem to be solved by the invention]

However, according to such a conventional wire harness wiring method, the ground side terminals of the rear combination lamps 6R, 6L, etc. are grounded to the body panel, and the body ground of the negative terminal of the vehicle battery installed in the engine room is connected to the body panel. The rear combination lamps 6R, 6L, etc. used the body panel 8 as the ground, from the front to the body ground in the trunk room.

For this reason, the earth line, which is supposed to be lossless, naturally has a loss in the body panel section, which is a little over 2 meters long in a straight line, resulting in a voltage drop.

Therefore, most of the contact opening/closing noise, slider noise, etc. that occur when turning on/off electrical components such as various lamps (for example, turn signals, cross clamps, etc.) are radiated from the body panel 8. There is a high probability that the signal will enter the antenna, causing radio interference.

Further, wire harnesses for electrical components such as various lamps and a defogger wire harness are combined at the rear parcel portion to form a body harness 11, which is wired on the body panel 8 and extends to the front of the vehicle.

Therefore, contact opening/closing noise and slider noise superimposed on the electrical component wire harness are guided to the defogger wire harness, radiate through the rear defogger 42 as an antenna, and mix into the radio antenna 41.
This caused a lot of noise on the radio.

In particular, radios in vehicles in which a rear differential and a radio antenna are integrated with the surface of the rear glass or are wired close to each other generate a large amount of noise.

In addition, in order to prevent the generation of such noise, it is necessary to take measures such as installing a noise preventer for each electrical component that is a noise source.

It is an object of the present invention to eliminate the above-mentioned drawbacks, to lead the ground of various lamps, etc. to the ground side terminal of the battery via the lead wire without connecting it to the body panel, and to at least When wiring the body harness, the defogger wire harness and the electrical wiring harness are separated from each other, and the electrical wiring harness is buried in a groove provided in the body panel. This prevents the contact opening/closing noise and sliding noise that occur when turning on and off electrical components from being radiated from the electrical wiring harness, and also prevents these noises from being introduced into the body harness and electrical wiring harness into the defogger harness. To provide a wiring harness wiring method that prevents noise from entering a car radio.

A second object of the present invention is to, in addition to the above, when wiring a wire harness for a vehicle in which a radio antenna is disposed close to or integrated with a rear defogger on the rear glass, Between the body panel,
An object of the present invention is to provide a wiring harness wiring method that can remove even a small amount of noise induced in a defogger wire harness by interposing a filter element for noise prevention.

[Means to solve the problem]

In order to achieve such an object, the present invention provides a wiring harness for a vehicle having a rear differential camera, a radio antenna, electrical components such as various lamps and various motors, and a battery. is connected to the ground side terminal of the battery using a lead wire, and at least in the area behind the dash side of the vehicle, the defogger wire harness related to the rear defogger and the electrical equipment wire harness connected to the electrical components are placed separated from each other. , the electrical wiring harness is embedded in a groove provided at the bottom of the body panel for wiring.

[Effect]

According to the present invention, the defogger wire harness related to the rear defogger and the electrical wire harness connected to electrical components such as various lamps and motors are arranged apart from each other, and the electrical wire harness is connected to the bottom body panel. Because it is embedded and placed along the groove, it prevents noise generated from electrical components from being guided to the defogger wire harness, etc., and prevents noise from entering car radios, etc. .

〔Example〕

The present invention will be explained in detail below based on the drawings.

In the following, the explanation will be continued using the same reference numerals for the same parts as shown in FIGS. 6 to 12.

FIG. 1 shows an embodiment in which the method of the present invention is applied to ground lines of rear combination lamps 6R, 6L, etc. Here 60 is the lead wire,
The ground side terminals of the rear combination lamps 6R and 6L are not directly grounded to the body panel 8, but are connected to the ground side of the battery B through a lead wire 60.

FIG. 2 shows an example of application of the method of the present invention to the rear parcel of a vehicle having a radio antenna in the rear fender.
The wire harnesses 45R and 45L connected to the trunk room main harness 2, which is an electrical wiring harness, are wired separately and guided to the body part without being combined with the trunk room main harness 2, which is an electrical wiring harness.

3A and 3B show an example of application of the method of the present invention to a body part, where 100 is a groove provided in the bottom part of the right side of the body panel 8 rearward from the dash side in this example; The electrical wiring harness 11A is buried, and the presser band 1 is inserted through the bush 101 as shown in FIG. 3B.
02 and a presser nut 103 to secure it to the body panel 8. Note that the cross-sectional shape of the groove 100 is 1.5 to 2 cm in depth and 3 to 5 cm in width.
It was preferable to provide the presser band 102 at at least one location behind the dash side in order to enhance the noise prevention effect.

11B is a defogger wire harness, and as shown in FIG. 3A, the defogger wire harness 11B was arranged and wired so as to be separated from the electrical equipment wire harness 11A by at least 5 cm.

By wiring in this manner, noise generated from electrical components such as the combination lamps 6R and 6L flows from the electrical component wire harness 11A to the body panel 8, so it is possible to suppress the noise from being radiated. In particular, by providing the holding band 102, etc., the capacity is increased between the electrical equipment wire harness 11A and the body panel 8, and the effect of flowing noise signals from the electrical equipment wire harness 11A to the body panel 8 can be enhanced. did it.

Further, since the defogger wire harness 11B is wired separately from the electrical equipment wire harness 11A, it is possible to prevent contact opening/closing noise from electrical components etc. from being superimposed on the defogger wire harness 11B. Generally, if a harness that generates contact opening/closing noise is bundled together with other harnesses, about 60% of the noise will be induced.
If you keep it 5-10cm away from 1A, you can reduce induced noise.
It was confirmed that it was possible to reduce the amount to about 10%.

FIG. 4 shows an embodiment in a rear parcel section of a vehicle having a rear differential camera and a radio antenna on the rear glass.

Here, electrical components such as a trunk room lamp 14, an air purifier 51, rear speakers 10R and 10L, and a rear suspension lamp 6 are included.
The wiring method for each wire harness connected to R and 6L is the same as before.

However, the wire harness 61 connected to the input terminal side of the inductor filter 47 for high frequency noise reduction is connected from the inductor filter 47 to the rear end of the vehicle of the rear parcel tray panel 46 like the conventional wire harness 45 shown in FIG. along with a wire harness 12 that connects to other electrical equipment
L, 15, 52, 12R, etc., without being wired together, the wires are wired from the terminal provided on the vehicle front end side of the inductor filter 47 toward the right side wall of the vehicle along the rear seat back body panel 8B, Separated from wiring related to electrical equipment.

In addition, the defogger sensor 48 shown in FIG.
Wire harnesses 69R and 6 connected to the terminals of
9L is the conventional wire harness 49R and 49
Instead of forming the wire harness 53 together with the electrical wiring harness as shown in L, the upper surface of the tray panel 46 is connected to the defogger sensor amplifier 55 by wiring each independently with the upper surface of the tray panel 46 facing the front of the vehicle, and the output line 56 is connected to the wire. It is combined with the harness 61 to form the differential wire harness 11B, and as described above, the electrical wiring harness 11 as a body harness.
I wired it to the side of the needle while keeping it separate from A.

Further, near the input side of the defogger sensor amplifier 55 or inside the unit of the defogger sensor amplifier 55, between the wire harnesses 69R and 69L and the rear seat back body panel 8B (conducted to the body panel 8), Filter elements 62R and 62L, such as capacitor filters, were interposed to reduce noise.

By wiring the wire harness in this way, the defogger wire harness 11B and the electrical equipment wire harness 11A can be separated, so that the noise signal superimposed on the electrical equipment wire harness 11A is guided to the defogger wire harness 11B. I was able to prevent this from happening.

Here, when the capacitors 62R and 62L are inserted on the output side of the defogger sensor amplifier 55, that is, in the defogger wire harness 11B, it has been experimentally found that the effect of inserting the capacitors is not so great. In addition, the defogger wire harness 11B at the rear of the vehicle from the rear seat back panel 8B was wired on the top surface of the tray panel 46, and the electrical equipment wire harness was wired on the bottom surface of the tray panel 46.
It was possible to give the tray panel 46 a shielding effect.

The defogger wire harness 11B and the electrical equipment wire harness 11A form a main harness 20 at the dartside side part shown in FIG. I was able to avoid most of it.

Although the noise is slight, the noise induced in the main harness on the side of the dash is between the wire harnesses 45R and 45L connected to the rear defogger 42 and the wire harness 61 in the defogger wire harness 11B. An inductor filter 47 is connected to the rear defogger sensor 48, and capacitor filters 62R and 62L as noise prevention filter elements are connected to the wire harnesses 69R and 69L of the rear defogger sensor 48 near the input terminal of the defogger sensor amplifier 55. By doing so, it was also possible to remove the noise slightly superimposed on the defogger wire harness 11B.

Note that as the filter elements 62R and 62L used here, it is preferable to use ceramic capacitors with a capacitance of about 0.001 μF to 0.1 μF from a cost standpoint, and if the capacitance is smaller than this, the filter effect will be reduced. Moreover, if the capacitance becomes larger than this, there is a possibility that the operation of the sensor amplifier will be adversely affected.

In addition, the input wire harness 61 to the inductor filter 47 is connected to the output side wire harnesses 45R and 45 of the inductor filter 47 as in the conventional case.
If you pull it out from the rear of the vehicle together with L and bundle it together, the filter effect of the inductor filter 47 will be canceled due to the induction of noise between the input and output lines.
In this example, the wire harness 61 is pulled out from the vehicle front side of the inductor filter 47 as shown in FIG.
The output lines to the filter case are taken out from the opposite side of the filter case.

In addition, although the above explanation is based on the wiring of the wire harness behind the darts side to prevent noise from entering the in-vehicle radio, there are other ways in which noise can enter, such as direct radiation from the instrument harness. This may be due to noise entering the radio antenna.

However, it has been confirmed through experiments that the noise from such a path is extremely small. Therefore, in order to effectively reduce radio noise, the above-mentioned wiring method and interposition of a filter are sufficient.

Also, the antenna output terminal AT (see Figure 11)
Since a shielded wire (not shown) was used from the to the in-vehicle radio (not shown), noise will not be mixed in from the shielded wire.

FIG. 5 is a comparison diagram of noise measured at the terminals of a radio speaker.

Here, the horizontal axis lists the operations of in-vehicle electrical components as noise generation sources. The vertical axis shows the magnitude of the generated noise expressed as the terminal voltage (V _P - _P ) at the radio speaker terminal. Moreover, the black circles are the measured values of noise according to the conventional example, and the white circles are the measured values of noise according to the embodiment of the present invention.

The displayed values are average values measured at several points in three AM broadcast band frequencies, and the arrows indicate the noise reduction effect achieved by implementing the present invention.

As is clear from this figure, the level of noise generated in the radio by various in-vehicle electrical components is uniformly reduced by applying the wiring method of the present invention.

〔Effect of the invention〕

As explained above, according to the present invention, when wiring the wiring harness of a vehicle, the ground side of various lamps is connected to the negative terminal side of the battery via the lead wire, and the The wire harness and the electrical wiring harness that connects to various electrical components such as lamps and motors are placed apart from each other, and the electrical wiring harness is embedded along the groove provided on the top surface of the bottom body panel. It is possible to prevent noise generated in electrical components from being introduced to the defogger wire harness or the like via the body harness or the electrical wire harness, thereby preventing noise from entering the car radio.

In addition to the method of the invention described above, when wiring a wire harness for a vehicle in which a radio antenna is installed in the rear glass, which is placed close to or integrated with the rear differential gear, it is also possible to wire the wire harness between the differential gear wire harness and the body panel. Preferably, a noise prevention filter element is interposed between each wire harness and the body panel immediately before connecting each wire harness to the defogger sensor amplifier to the defogger sensor amplifier. We were able to further reduce the noise induced in the Otsuga wire harness, albeit to a very small extent.

It goes without saying that the wiring method of the present invention can be widely applied to this type of vehicle, and it is not only possible to select and install a noise suppressor for each electrical component as in the past, but also to take noise countermeasures into consideration for each vehicle type. This eliminates the need for noise intrusion into car radios, and contributes to shortening the development period for new models.

[Brief explanation of the drawing]

Figures 1 to 4 relate to the wiring method of the wire harness of the present invention. Figure 1 is a wiring diagram of the combination lamp, and Figure 2 is a wiring diagram of the rear parcel of a vehicle having a radio antenna in the rear fender. Figures 3A and 3B are perspective views showing how the wire harness is wired in the body, and a cross-sectional view of the harness taken along line X--X. FIG. 5 is a top view showing the wiring state of the wire harness in the rear parcel part of a vehicle having a radio antenna and a wire harness, and shows wiring according to the conventional wire harness wiring method and wiring according to the present invention wire harness wiring method. Graph comparing measured values of noise generation from car radios, Figure 6~
Fig. 12 relates to a conventional wiring harness wiring method, and Fig. 6 is a perspective view showing the wiring state of the wiring harness in the rear of the trunk of a vehicle;
Figure 7 is the wiring diagram of the combination lamp.
Fig. 8 is a perspective view showing the wiring state of the wire harness in the rear parcel of a vehicle having a whip antenna in the rear fender part, Fig. 9 is a perspective view showing the wiring state of the wire harness on the right side of the dashboard, and Fig. 10 is the body. FIGS. 11 and 12 are a front view and a top view showing the wire harness wiring in the rear parcel of a vehicle having a rear differential camera and a radio antenna on the rear glass. B...Battery, 1...Trunk room, 2...
...Main harness, 3R, 3L...Combination lamp harness, 4...Stop tail sensor harness, 5...License lamp harness,
6R, 6L...Combination lamp, 7...
License lamp, 8...Body panel, 8A...
...Earth line, 8B...Rear seat back body panel, 9...Switch circuit, 10R, 10L
...Rear speaker, 11 ...Body harness, 1
1A...Electrical wire harness, 11B...Defogger wire harness, 12, 12R, 12L...
Speaker harness, 14... Trunk room lamp, 15, 16, 17, 18... Wire harness, 20... Main harness, 21... Instrument harness, 22... Wire harness, 23... Fuse box, 24... Time control Unit, 25... Auto door lock timer unit, 26... Power window timer unit, 27
... Audio harness, 30, 31 ... Wire harness, 32 ... Wiring, 41 ... Radio antenna, 42 ... Rear differential gear, 43 ... Rear glass, 44R, 44L ... Power supply terminal, 45R, 45
L... Wire harness, 46... Tray panel,
47... Inductor filter, 48... Defogger sensor, 49R, 49L, 50... Wire harness, 51... Air cleaner, 52, 53... Wire harness, 54... Rear main harness, 55
...Defogger sensor amplifier, 60...Lead wire, 62R, 62L...Filter element, 69R,
69L...Wire harness, 100...Groove, 10
1...butsuyu, 102...presser band, 103
...Press nut.

Claims (1)

[Claims] 1. When wiring a wiring harness for a vehicle that has a rear differential camera, a radio antenna, electrical components such as various lamps and various motors, and a battery, connect the ground side terminals of the various lamps to the ground side terminal of the battery using lead wires. At least in a region rearward of the dash side of the vehicle, a defogger wire harness related to the rear defogger and an electrical wire harness connected to the electrical component are arranged to be separated from each other, and the electrical wire harness is connected to the vehicle. A wiring harness wiring method characterized by wiring the wiring by embedding it in a groove provided at the bottom of a body panel.