JPH0966782A - Wire harness for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the configuration of installment panel harness and cowl harness. SOLUTION: Groups of electrical wires which constitute instrument harness and cowl harness are divided into a power supply system, a grounding system, and a signal system. The power supply system consists of four bus bars of a +B power supply system bus bar 20, an IG power supply system bus bar 21, an ACC power supply system bus bar 22, and an ST power supply system bus bar 23. Five bus bars consisting of these power supply system bus bars and a grounding system bus bar 24 are provided over the whole length on the right and left inside an instrument panel. Tabs provided on these bus bars are connected with an electrical connection box, a switch, and an electrical part on a load side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire harness arranged in a space sandwiched between a cowl panel and an instrument panel of an automobile, and particularly to simplifying the structure of the wire harness.

[0002]

2. Description of the Related Art Conventionally, in a space between a cowl panel and an instrument panel of an automobile, a cowl harness attached to the cowl panel side and an instrument panel harness attached to the instrument panel side (hereinafter referred to as instrument panel harness). (Referred to as)), and these are electrically connected to each other through a connector or the like.

As for the power supply circuit for the cowl harness and the instrument panel harness, as shown in FIG. 7, the + B electric wire 2 connected to the battery 1 arranged on the engine room side is connected to the connector 4 attached to the cowl harness 3. The connector 4 is connected to the relay box 6 of the instrument panel harness 5. The relay box 6 is arranged at one end on the passenger side, and the + B power line 2 penetrates the space between the instrument panel 7 and the cowl panel 8 and is connected to the junction box 9 arranged at the other end on the driver side. There is. The junction box 9 and the ignition switch 10 are connected via four power lines (+ B power line 2, IG power line 11, ACC power line 12, ST power line 13) and each electrical component 14 (meter 14A , Heater switch 14B, watch 14C, hazard 14D, etc.) are connected via the required power supply line among the four power supply lines.

Since the cowl harness 3 and the instrument panel harness 5 have a mixture of signal lines and ground lines in addition to the above-mentioned power source lines, they are wired separately for each switch and load side electrical component 14. In addition, conventionally, the internal circuit of the main junction box 9 has a circuit configuration in which only the basic circuit is incorporated, and the branch connection of the power supply, the signal, and the ground is connected to the cowl harness 3 and the instrument panel harness 5.
It is configured to be absorbed by.

[0005]

The above-mentioned conventional circuit configuration has the problems listed below. Since the power supply line, the signal line, and the ground line are mixed and the splice is absorbed by each wire harness (the cowl harness 3 and the instrument panel harness 5), the configuration of each wire harness is very complicated. That is, even if only the instrument panel harness 5 shown in FIG. 7 is seen, a large number of electric wires are branched from the electric wires connected to the junction box 9, which is very complicated.

Inside the instrument panel, after wiring from the relay box 6 at one end to the junction box 9 at the other end, there is a circuit system that reciprocates from the junction box 9 to each electrical component 14 at the center. The wire harness diameter is expanding.

A joint connector and a joint box are used to absorb the splice, and a protector is also used to protect the wire harness, so that the number of parts is very large. In particular, since the power supply line is complicatedly wired inside the instrument panel, it is necessary to protect the power supply line with a protector, and there is a problem that a space occupied by the protector is large.

When the wire harness is routed inside the instrument panel, the space between the instrument panel and the cowl panel is not so wide, so that the wiring work is not easy. In particular, the cowl harness and the instrument panel harness are The electrical connection work such as the connector fitting has to be done in a narrow space, and there is a problem that the fitting work is not easy. Furthermore, it is necessary to arrange the joint connector and the joy box attached to the wire harness in a limited space, which also limits the configuration of the wire harness and reduces the number of labors required for wiring the wire harness. There was such a drawback.

The present invention has been made in view of the above-mentioned problems, and a switch and a load are provided between a cowl harness and an instrument panel harness arranged in a space sandwiched between a cowl panel and an instrument panel of a vehicle as in the conventional case. Instead of dividing the system by each side electrical component, power system, ground system,
Separate the signal system and system to simplify the wiring form,
An object of the present invention is to provide a wire harness for an automobile, which can be easily connected to an electric connection box, a switch, and a load side electric component arranged in an instrument panel.

[0010]

In order to achieve the above object, the present invention provides an instrument panel,
The wire group that composes the harness and the cowl harness is divided into a power system, a ground system, and a signal system. The power system is a + B power system directly connected to the battery, and an IG power system connected to the ignition position of the ignition switch. , AC connected to the accessory position of the ignition switch
It consists of four power supply systems of C power supply system and ST power supply system connected to the start position of the ignition switch, and five circuits consisting of these power supply system and earth system are formed by one long bus bar, respectively, and installed. It is arranged so as to pass through the entire length in the left and right inside the instrument panel, and tabs are projectingly provided at the required locations of the above-mentioned bus bar, and the electrical connection box, switch and load installed inside the instrument panel through these tabs. We provide wire harnesses for automobiles that are connected to side electrical components.

According to the structure of the first aspect, since the power supply system, the ground system and the signal system are systematically separated after the cowl harness and the instrument panel harness are integrated, the conventional switch and load side electrical components are separated. As compared with the case where each system is systemized, the circuit form can be simplified and the number of wires can be reduced. In other words, the electrical connection box, switch, and electrical components inside the instrument panel need only be connected to the tabs of the bus bar for the power supply system and the ground system that are provided at the shortest position, so the existing reciprocating line can be eliminated. it can.

Further, the power supply system and the earth system are made into a bus,
Since it is arranged so as to penetrate through the inside of the instrument panel, it is possible to protect the power supply system circuit and improve safety without using a protector which has been conventionally required.
Moreover, the space between the instrument panel and the cowl panel can be effectively used.

The above-mentioned five bus bars are insert-molded on the instrument panel, and the tabs are provided so as to project from the inner surface of the instrument panel. (Claim 2)

With the above arrangement, the bus bar can be easily arranged inside the instrument panel, and the electric connection box, switch and load side electrical equipment arranged inside the instrument panel can be easily connected.

Tabs are provided at both ends of the above-mentioned five bus bars, and the five tabs on one end side are connected to relay boxes arranged on the left and right one end sides of the instrument panel, while the five tabs on the other end side are It is connected to a junction box located on the other end of the instrument. (Claim 3)

With the above arrangement, it is possible to easily connect the four power supply systems and the grounding system to be molded in the instrument panel to the relay box and the junction box.

It is preferable that the instrument panel is formed of a foam material. (Claim 4) Furthermore, it is preferable that the signal system other than the power supply system and the ground system is composed of a fine electric wire.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. The same members as those in the conventional example shown in FIG. 8 are designated by the same reference numerals. FIG. 1 is a schematic circuit diagram of a wire harness according to the present invention, in which a conventional power source system is provided after integrating a circuit including a cowl harness and an instrument panel harness.
The ground system and the signal system were redesigned separately, and the power supply system and the ground system were respectively formed by bus bars.

The power supply system includes a + B power supply system bus bar 20 directly connected to a battery and an ignition switch 10.
IG power system busbar 2 connected to the ignition position of
1. ACC power system busbar 22 connected to the ignition switch accessory position and ST power system busbar 2 connected to the start position of the ignition switch
It consists of 4 bus bars of 3. Further, the earth system is also formed by one earth system bus bar 24, and these five bus bars 20 to 24 form a bus circuit.

As shown in FIG. 2, the bus bars 20 to 24 are elongated strip-shaped laterally long portions 20a to 24a extending over the entire length of the instrument panel 30, and the relay box 6 is bent from both ends thereof. Longitudinal portions 20b to 24 that are connected to the junction box 9
The shape has b.

As shown in FIG. 3, the bus bars 20 to 24 are insert-molded inside the instrument panel 30 in a state of being arranged in parallel in the thickness direction at regular intervals. That is, the + B power supply system bus bar 20 is arranged on the inner surface side of the instrument panel 3, and ICs are sequentially arranged.
The power supply system bus bar 21, the ground system bus bar 24, the ACC power supply system bus bar 22, and the ST power supply system bus bar 23 are arranged.

As shown in FIG. 2, tabs 20c to 24c are provided on the inner surface of the instrument panel so as to project vertically at a constant pitch at the ends of the vertically long portions 20b to 24b at the left and right ends of each of the bus bars 20 to 24. Is provided. These tabs 20c to 24c are inserted into respective terminal accommodating portions of the connector box (not shown) of the relay box 6 and the junction box 9 which are attached to both left and right sides of the instrument panel 30, and are electrically connected to the internal circuit.

Further, the horizontally long portion 2 of each bus bar 20-24
The instrument panel 3 is also installed at the required positions 0a to 24a.
Tabs 20d to 24d projecting from the inner surface of 0 are projected. These tabs 20d to 24d are, as shown in FIG.
Ignition switch 10, meter 14A, heater switch 14 attached to the instrument panel 30
B, the watch 14C, the switches such as the hazard 14 and the electric wires 40 connected to the load side electric components are connected to the female terminal 41 housed in the connector 42 attached to the tip of the electric wire 40.

The switches and the load side electric components are connected to the bus bars 20 to 24 at the shortest position. Therefore, the tabs 20d to 24d are formed corresponding to the positions where the switches and the load side electric components are arranged. ing. By connecting the electric wires 40 at the shortest distance in this way, the length of the electric wire 40 interposed is shortened. It is most preferable to provide the tabs 20d to 24d at positions where they can be directly connected to the switch and the electrical connection portion of the load-side electric wire product.

Signal circuits other than the power supply system and the ground system are formed of thin electric wires. As shown in FIG. 4, the thin electric wires of the signal system are formed of a flat harness 26, and an instrument panel is formed. Storage groove 31 formed on the inner surface of 30
It is housed inside and routed.

In the wire harness having the above structure, the power supply system bus bars 20 to 23 and the ground system bus bar 24 are arranged by insert molding inside the instrument panel 30, and the signal system flat harness 26 is arranged on the instrument panel 30. Since it is housed and arranged in the housing groove 31 on the inner surface, it is not exposed in the space surrounded by the instrument panel 30 and the cowl panel, and a protector or the like which has been conventionally required can be eliminated.

When the instrument panel 30 is assembled to the vehicle body in the automobile assembly line, the wire harness including the bus bar and the flat harness is previously assembled to the instrument panel 30, so that the instrument panel 30 is attached to the instrument panel 30. It is only necessary to connect the relay box 6, the junction box 9, the switch, and the load side electrical components that are connected to the tabs of the bus bar, and the wiring work can be greatly reduced.

The present invention is not limited to the above-mentioned embodiment, and is shown in FIG.
As shown in, it is preferable that the instrument panel 30 that insert-molds the bus bars 20 to 24 is formed of a foam material. As described above, when the instrument panel 30 is formed of the foam material, the weight of the instrument panel 30 can be reduced, a vibration absorbing function can be provided, rattling can be prevented, and abnormal noise and noise can be reduced.

Further, the bus bar is not insert-molded on the instrument panel, but the bus bar 20-24 is insert-molded as shown in FIG.
0 and the separate member 50 is attached to the instrument panel 3
It may be accommodated in the accommodating groove 32 formed in 0 ′ and added later.

Further, the signal system may be provided by binding ordinary thin electric wires and attached to the instrument panel via a clip or the like.

[0031]

As is apparent from the above description, according to the wire harness of claim 1 of the present invention, the circuits conventionally separated by the system of electric components are divided into a power supply system, a ground system, and a signal system. In addition to dividing, the power supply system is further + B power supply system,
IG power supply system, ACC power supply system, ST power supply system, these four power supply systems and ground system are each formed by one bus bar, and penetrate the instrument panel over the entire left and right sides. The electrical connection box, switch, and load side electrical components that need to be connected to can be connected to the power supply system bus bar and earth system bus bar at the shortest position. Therefore, unlike the past, the power supply line does not become a round trip line,
The circuit configuration can be simplified and the number of wires can be reduced.

Furthermore, since the power supply system and the earth system bus bar are embedded inside the instrument panel, reliable protection can be achieved, the protector conventionally required can be eliminated, and the safety can be improved. it can.
Furthermore, because it is embedded inside the instrument panel, there is a space between the instrument panel and the cowl panel, and it is easy to connect the electric wires between the bus bar and the switch and the load side electrical component side. The above space can be effectively used.

Further, when the bus bar is insert-molded on the instrument panel, the bus bar can be easily arranged inside the instrument panel, and when the tabs protruding from the bus bar are protruded from the inner surface of the instrument panel, the instrument panel is formed. Connection to the electrical connection box, switch and load side electrical components placed inside can be done easily.

[Brief description of drawings]

FIG. 1 is a drawing showing a circuit configuration of a wire harness of the present invention.

FIG. 2 is a perspective view showing the relationship between the bus bar and the instrument panel of the present invention.

FIG. 3 is a cross-sectional view showing a state where a bus bar is attached to an instrument panel.

FIG. 4 is a cross-sectional view of a signal system flat harness attached to an instrument panel.

FIG. 5 is a cross-sectional view showing another embodiment of the instrument panel.

FIG. 6 is a cross-sectional view showing another embodiment of a state where the bus bar is attached to the instrument panel.

FIG. 7 is a diagram showing a circuit configuration of a conventional wire harness.

FIG. 8 is a perspective view showing a state in which a conventional instrument panel harness is installed on an instrument panel.

[Explanation of symbols]

 1 Battery 6 Relay Box 7 Instrument Panel 8 Cowl Panel 9 Junction Box 10 Ignition Switch 14A-14D Load Side Electrical Equipment 20 + B Power System Bus Bar 21 IG Power System Bus Bar 22 ACC Power System Bus Bar 23 ST Power System Bus Bar 24 Earth System Bus Bar 20c -24c, 20d-24d tab 26 signal system flat harness 30 instrument panel

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhiro Hattori 1-7-10 Kikuzumi, Minami-ku, Nagoya-shi, Aichi Harness Institute of Technology Co., Ltd.

Claims (4)

[Claims] 1. An electric wire group constituting an instrument panel harness and a cowl harness is divided into a power supply system, a ground system and a signal system, and the power supply system is a + B power supply system directly connected to a battery and an ignition switch. IG power system connected to the ignition position, ACC power system connected to the accessory position of the ignition switch, and S connected to the start position of the ignition switch
It is composed of four power supply systems of T power supply system, and each of the five circuits consisting of the power supply system and the ground system is formed by one long bus bar, and is arranged so as to penetrate through the instrument panel over the entire left and right sides. In addition, tabs are protrudingly provided at required locations on the bus bar, and an automotive wiring harness connected to the electrical connection box, switch, and load-side electrical components installed inside the instrument panel through these tabs. . 2. The wire harness for an automobile according to claim 1, wherein the five busbars are insert-molded on an instrument panel, and the tabs are provided so as to protrude from an inner surface of the instrument panel. 3. A tab is provided at each end of each of the five bus bars, and the five tabs on one end side are connected to a relay box arranged on one left and right end sides of the instrument panel, while the five tabs on the other end side are connected to each other. The wire harness for an automobile according to claim 2, wherein the tab is connected to a junction box arranged on the other end side of the instrument panel. 4. The wire harness for an automobile according to claim 3, wherein the instrument panel is formed of a foam material.