JP4900689B2 - Wire routing structure on the back side of the instrument panel - Google Patents

Description

  The present invention relates to a wire arrangement structure on the back side of an instrument panel (hereinafter referred to as instrument panel) of an automobile.

  In automobiles, on the back side of the instrument panel, in addition to the power and ground lines from the battery, power lines such as ignition power lines, alternator power lines, starter power lines, meters, air conditioners, power generators, navigation devices, A wire harness in which various electric wires such as signal lines to various load electrical components such as an audio device are bundled is arranged. This wire harness is held by an instrument panel hose and is routed along the instrument panel hose.

  However, in recent years, with the digitization of vehicle systems, the number of electric wires has increased, the diameter of the wire harness has increased, and the weight has also increased. Therefore, workability at the time of assembling the vehicle is deteriorated. In addition, when various power lines have to be close to the audio device, there is a problem that radiation noise is generated from the speaker. In this case, it is possible to suppress noise by using a shielded wire, but the cost is increased accordingly.

  Japanese Patent Application Laid-Open No. 09-066782 proposes an instrument panel in which a power bus bar is integrally formed inside a base. Japanese Patent Application Laid-Open No. 2000-203311 proposes an instrument panel in which a conductive wire is embedded in a base. According to these instrument panels, the load electrical equipment can be individually connected to the bus bar or the wire, and the wiring harness can be eliminated, and the connection distance between the electrical equipment and the bus bar or the wire can be shortened. . Therefore, the assembly workability is improved and the vehicle body can be reduced in weight.

  However, in the techniques described in these publications, for example, even when the passenger's seat side airbag is actuated, the wire material needs to be free from problems.

In addition, since an ignition power supply line or an alternator power supply line is also embedded in the instrument panel base, it is often close to a housing such as an audio device or a navigation device. Therefore, it has been difficult to solve the problem that radiation noise is generated from the speaker.
JP 09-066782 JP 2000-203311

  This invention is made | formed in view of the said situation, and makes it the subject which should be solved to improve workability | operativity at the time of the assembly of a vehicle by reducing a wire harness in diameter and weight. Further, according to the present invention, it is possible to prevent the generation of radiation noise without using a shield wire.

The feature of the wire routing structure on the back side of the instrument panel according to the present invention that solves the above problems is that an instrument panel comprising a hard base and a soft skin covering the surface of the base, and a conductive body formed integrally with the base And a wiring harness arranged so as to oppose the back surface of the substrate, and one of the power supply line or the ground wire of the wiring from the battery is routed as the substrate wiring section and the other is wired as the wire harness. It is in the measure .

  According to the wire routing structure on the back side of the instrument panel according to the present invention, various wirings are routed by being divided into a base wiring portion and a wire harness integrally formed on the instrument panel base material. As a result, the diameter of the wire harness can be reduced and the weight can be reduced, and the assembly workability at the time of assembling the vehicle is improved.

  Furthermore, it is possible to easily increase the distance between the various power supply lines and a housing such as an audio device or a navigation device. Further, it is not necessary to run the alternator power line and the ignition power line in parallel, and it is possible to arrange them at positions away from each other. Therefore, generation of radiation noise can be prevented in advance.

  The electric wire routing structure on the back side of the instrument panel according to the present invention includes an instrument panel and a wire harness. The instrument panel is composed of a hard base and a soft skin covering the surface of the base, and the base wiring portion is integrally formed on the base.

  The base is molded into a predetermined shape from a hard resin such as PP or PE. The skin is generally composed of a foam layer formed from foamed urethane or the like and a skin layer coated on the surface of the foam layer from a thermoplastic elastomer or the like. The substrate, skin layer, and foam layer may be laminated in advance with a predetermined shape and integrated by bonding or the like, and the substrate and skin layer are placed in a mold and foamed between them. It can also be molded and integrated.

  A base wiring portion is integrally formed on the base. The substrate wiring portion may be printed on the surface of the substrate or partly exposed on the surface of the substrate, but most of the substrate wiring portion is preferably embedded in the substrate. The base wiring portion may be formed of a conductive material such as copper in a linear shape, a strip shape, a tape shape, a plate shape, or the like. The substrate wiring portion can be integrated with the substrate by placing a material previously formed from copper or the like into a predetermined routing shape in a mold and molding the substrate.

  As the wire harness, a wire harness composed of a main line part and a branch line part branched from the main line part can be used as in the prior art. The trunk line is held by an instrument panel hose. A terminal is formed at the tip of the branch line portion.

  It is desirable that the base has a coupling portion in which a terminal derived from the wire harness or a terminal derived from the load electrical component is electrically connected to the base wiring portion and coupled to the base. For example, a branch line extending from the base can be formed with one end conducting to the base wiring portion, and a coupling portion can be formed at the tip thereof. It is also preferable that the coupling portion is formed integrally with the base so that the terminal at the tip of the branch line portion led out from the wire harness is detachably coupled. In this case, the coupling form is not particularly limited, such as a male and female connector coupling or a bolt and nut coupling.

  In the electric wire arrangement structure of the present invention, there are an electric wire that is preferably arranged in the conductive wiring portion of the base and an electric wire that is preferably arranged in the wire harness. For example, it is desirable to route the power line from the battery as a wire harness, and route the ground wire as a base wiring part. In this way, it is possible to reliably prevent a short circuit between the power line from the battery and the ground line. Even when the passenger airbag operates, the ground wire is disconnected, but the power line from the battery is not disconnected.

  In addition, when the ground wire is routed as a wire harness as in the conventional case, it is necessary to lengthen the entire length of the wire harness in order to connect the ground wire to a ground circuit of a door load electrical component such as an electric door mirror. In addition, when the total length of the wire harness is short, it is necessary to form a splice (addition) in the ground circuit. However, by arranging the ground wire as the base wiring portion, it is possible to minimize the length of the connection line with the ground circuit of various load electrical components. Therefore, the length of the wire harness can be shortened, and the splice can be eliminated.

  The wire harness is held by the instrument panel hose. Therefore, it has been difficult to increase the distance between the housing of the audio device or the navigation device and the wire harness more than before. Therefore, when the ignition power supply line is arranged as a wire harness, radiation noise may occur in the audio device or the navigation device.

  However, according to the electric wire arrangement structure of the present invention, the ignition power supply line can be arranged as the base wiring portion. In this way, the degree of freedom in the arrangement position of the ignition power supply line is greatly increased, so the distance from the housing of the audio device or navigation device can be increased, and radiation noise can be reduced without using a shielded wire. Can be prevented.

  And when an ignition power supply line is routed as a base | substrate wiring part, it is preferable to route an alternator power supply line as a wire harness. By separating the alternator power line without running parallel to the ignition power line, there is no concern about radiation noise.

  Further, when the power supply line from the battery is arranged as a wire harness, the alternator power supply line can be arranged as a base wiring part. In this way, since the battery and the alternator do not go down at the same time and at least one of them lives, the engine can be started when a failure occurs in either one.

  Further, it is also preferable to route the wiring of standard load electrical equipment as a base wiring portion and to route the wiring of optional load electrical equipment as a wire harness. In this way, since the instrument panel having the base wiring portion is applied to all the vehicle types and only the wire harness is changed according to the option, the cost required for the instrument panel can be greatly reduced. Also in this case, since the wire harness is reduced in diameter and weight as compared with the conventional one, the assembly workability is improved.

  Hereinafter, the present invention will be described specifically by way of examples.

Example 1
The instrument panel 1 shown in FIG. 1 includes a base 10 made of PP and a skin layer 11 that covers the surface of the base 10 as shown in FIG. The skin layer 11 is composed of a urethane foam layer 12 integrally joined to the substrate 10 and a thermoplastic elastomer skin layer 13 integrally joined to the surface of the urethane foam layer 12.

  A plurality of long plate-like conductors 20, 21, 22, and 23 formed of a copper material are embedded in the base body 10. A female connector 14 in which a tab 25 extending from the conductor 21 is exposed and a nut portion 26 protruding from the conductor 20 are formed integrally with the base 10 on the back surface side of the base 10. The base 10 is formed by injection molding by placing the conductors 20, 21, 22, 23 in the mold, so that the female connector 14 is integrally formed with the base 10 and the conductors 20, 21, 22, 23 are The substrate 10 is integrally embedded.

  The instrument panel 1 is fixed to the vehicle body by being held at both ends of the lean hose 3. A wire harness 4 is held on the lean hose 3 by a clamp (not shown), and the wire harness 4 is routed along the lean hose 3.

  In this embodiment, as shown in FIG. 3, a plurality of + B power supply lines 40 that supply power from the battery to various load electrical components and an ALT power supply line 41 that supplies power from the alternator to the battery are arranged as a wire harness 4. ing. These power lines are connected to the battery via the junk box 5. Further, an IG power line (conductor 21) for supplying power from the battery to the ignition switch is routed from the junk box 5 into the base body 10 as a base body wiring portion, and an earth line (conductor 20) is also routed as the base body wiring portion.

  According to the wire routing structure of the present embodiment, the + B power line 40 from the battery is routed as the wire harness 4 and the ground wire (conductor 20) is routed as the base wiring portion. Therefore, it is possible to reliably prevent the + B power supply line 40 and the ground line (conductor 20) from being short-circuited. Even when the passenger airbag is activated, the ground wire (conductor 20) is cut, but the + B power line 40 is not cut.

  Further, according to the electric wire arrangement structure of the present embodiment, the IG power line (conductor 21) is arranged as the base wiring portion. Therefore, the distance between the housing of the audio device or the navigation device and the IG power line 21 can be increased, and radiation noise can be prevented without using a shield wire. Furthermore, since the ALT power supply line 41 is arranged as the wire harness 4, the ALT power supply line 41 and the IG power supply line (conductor 21) can be separated without running in parallel, further preventing the generation of radiation noise. be able to.

  Since the ground wire (conductor 20) is arranged as a base wiring portion, it is possible to connect the ground wire (conductor 20) and a ground circuit of a load electrical component for a door such as an electric door mirror at the shortest distance. . Therefore, the length of the wire harness 4 can be shortened, and the splice (addition) of the ground circuit can be eliminated.

( Reference example )
In this reference example , as shown in FIG. 5, a plurality of + B power supply lines 42 for supplying power from the battery to the optional electrical components are arranged as the wire harness 4. In addition, a plurality of + B power lines (conductor 24) for supplying power from the battery to standard electrical components and a ground line (conductor 20) are arranged as a base wiring portion.

  Here, the standard electrical equipment refers to load electrical equipment such as the navigation device 6 equipped in all the vehicle models in which the instrument panel 1 is used, and the optional electrical equipment is a standard that is attached according to customer requirements at the time of purchase. Load electrical equipment other than electrical equipment. A branch line portion 43 is branched from the main line portion of the wire harness 4, and a tip end of the branch line portion 43 is connected to the navigation device 6 via a connector 60.

Therefore, according to the electric wire arrangement structure of the present reference example, the instrument panel having the above-described base wiring portion is applied to all the vehicle types, and only the wire harness 4 needs to be changed according to the customer's option. Can be greatly reduced. Also in this case, since the wire harness 4 is reduced in diameter and weight as compared with the prior art, it goes without saying that the assembly workability is improved.

It is a perspective view of an instrument panel which has an electric wire arrangement structure concerning one example of the present invention. It is AA sectional drawing of FIG. It is a block circuit diagram which shows the electric wire routing structure which concerns on one Example of this invention. It is sectional drawing equivalent to the BB cross section of FIG. 1 of the instrument panel which has the electric wire routing structure which concerns on a reference example . It is a block circuit diagram which shows the electric wire routing structure which concerns on a reference example .

Explanation of symbols

1: Instrument panel 10: Base 20-24: Conductor (base wiring part)
3: Instrument panel hose 4: Wire harness 5: Junk box

Claims (7)

An instrument panel comprising a hard substrate and a soft epidermis covering the surface of the substrate;
A conductive substrate wiring portion formed integrally with the substrate;
A wire harness disposed so as to face the back surface of the substrate,
An electric wire arrangement structure on the back side of an instrument panel , wherein one of a power supply line or a ground line of wiring from a battery is arranged as the base wiring portion and the other is arranged as a wire harness .   The electric wire arrangement structure on the back side of the instrument panel according to claim 1, wherein a power line from the battery is arranged as the wire harness and an earth line is arranged as the base wiring portion.   The wire arrangement structure on the back side of the instrument panel according to claim 1, wherein an ignition power line is arranged as the base wiring portion.   The electric wire routing structure on the back side of the instrument panel according to claim 3, wherein the alternator power line is routed as the wire harness.   The wiring of a standard specification load electrical component is routed as the base wiring portion, and the wiring of an optional specification load electrical component is routed as the wire harness. Policy structure.   2. The instrument panel rear surface side according to claim 1, wherein the base has a coupling portion in which a terminal derived from the wire harness or a terminal derived from an electrical component is electrically connected to the base wiring portion and is detachably coupled. Electric wire routing structure. The wire arrangement structure on the back side of the instrument panel according to claim 6, wherein the coupling portion is formed integrally with the base body.

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