JPH0966779A - Wire harness for power supply circuit of automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a supply of power to electrical parts without using a long power supply so as to reduce the weight of wire harness by arranging a power supply main line over the whole length of a couch panel of an automobile on the right and left and connecting electrical parts mounted on the automobile with the power supply main line at the shortest position through a power supply branch line. SOLUTION: A (+B) power supply main line 10 connected with a battery directly and an IG power supply main line 20 connected with an ignition position of an ignition switch are spread over the whole length L1 of a couch panel of an automobile on the right and left, the whole length L2 on both sides on the right and left and a front side of an engine room, the whole length L3, L4 on both sides on the right and left of a car room, the whole length L5 on the right and left in a rear section of the car room, and the whole of the inside of the automobile. An electrical part 4 to be mounted on the automobile for the +B power supply main line 10 and the IG power supply main line 20 is connected with either of the power supply main line 10 and 20 through a power supply branch line 30 at the shortest position. Consequently, it is possible to supply a power supply to the electrical parts without using a long power supply so that the weight of wire harness can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire harness for a power supply circuit of an automobile, and more particularly to an improved system for distributing power to electric components mounted in the automobile, reducing the amount of electric wires and reducing the weight of the wire harness. Is to reduce.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, a power supply is distributed to electric components mounted in an automobile by a battery 1 mounted in an engine compartment E via a power supply line 3 in an engine compartment E and a vehicle. The power supply boxes 2 arranged on both sides of the instrument panel in the room are connected to each other, and the power supply boxes 2 and the electrical components 4 are connected by a power supply line 5 to supply power to each electrical component 4. Therefore, even the electrical components mounted on the rear side of the automobile are connected using the long power supply line 5.

The types of the power supply lines are roughly classified into the following four types. That is, the + B power line 3 directly connected to the battery 1 and the + B power line 3 as shown in FIG.
The ACC power supply line 5a to which power is supplied when the ignition 7 provided on the power supply line 3 is turned on at the accessory position.
And an IG power line 5b to which power is supplied when turned on at the ignition position, and an ST power line 5c to which power is supplied when turned on at the start position. The electric component 4 mounted on the automobile is connected to a required power supply line among the power supply lines 3, 5a, 5b, 5c.

Further, a fuse 6 suitable for the current capacity of the electrical component 4 is provided on the power supply lines 3, 5a to 5c for connecting the electrical component 4 and the power source box 2 to the electrical component 4. In addition to preventing overcurrent energization, the size of the electric wire connecting the fuse 6 and the electric wire product 4 is reduced, and the electric wire is branched downstream of the fuse 6 to be connected to a plurality of electric components.

[0005]

In the above power distribution system, all the electrical components 4 mounted on the vehicle are supplied with power from the power box 2 arranged in the engine compartment E or the front of the compartment. Therefore, it is necessary to route the power supply line to the engine compartment E or the front part of the vehicle compartment even in the electrical component 4 located at a position away from the power supply box 2 such as in the rear of the vehicle, and the electric wire length becomes long. As a result, the weight of the wire harness that is routed over the entire vehicle is increased, and this is a factor of cost increase.

Further, when a fuse 6 is attached to a junction box or a fuse box arranged in or near the power supply box 2 and an electric wire is branched downstream of the fuse 6 and connected to a plurality of electrical components 4, the fuse 6 is After the melting, there was a problem that power was not supplied to all of the plurality of electrical components 4 on the downstream side.

Furthermore, when a new power supply circuit is required due to an optional electrical component being installed later, it is necessary to branch the power supply line and connect it to the electrical component 4, such as a junction box or a joint connector at the branch position. It is necessary to install the electric connection tool of, and there is a problem that electric components cannot be easily retrofitted.

The present invention has been made in view of the above problems, and it is an object of the present invention to reduce the weight of a wire harness by making it possible to supply power to electrical components without using a long electric wire. Furthermore, a problem that occurs when an electric wire is branched downstream of a fuse and connected to an electrical component, that is, power is not cut off to a plurality of electrical components when the fuse is blown, and Even in the case of retrofitting, the electric component can be easily supplied with power.

[0009]

To achieve the above object, the present invention provides a + B power supply main line directly connected to a battery and an ACC power supply main line connected to an accessory position of an ignition switch according to claim 1. At least two of the three power mains of the IG power mains connected to the ignition position of the ignition switch are routed at least along the left and right length of the cowl panel of the car, and the electrical components installed in the car are the shortest. (EN) A wire harness for a power supply circuit of an automobile, characterized in that it is configured to be connected to a power supply main line at a position via a power supply branch line.

Further, according to claim 2, there are three + B power supply lines directly connected to the battery, an ACC power supply main line connected to the accessory position of the ignition switch, and an IG power supply main line connected to the ignition position of the ignition switch. At least two of the main power lines of the car are stretched over the entire inside of the car, including the entire length of the car cowl panel on the left and right sides, the left and right sides of the engine room, the front side, the left and right sides of the passenger compartment, and the rear left and right sides. The present invention provides a wire harness for a power supply circuit of a vehicle, characterized in that an electrical component mounted on the vehicle is connected to a power supply trunk line at the shortest position via a power supply branch line.

As described above, when the + B power supply trunk line, the ACC power supply trunk line, and the IG power supply trunk line are installed in the entire left and right lengths of the cowl panel, especially in the instrument panel where many electric components are mounted, It is preferable to extend the power supply line all over the vehicle because the power supply line in the shortest position can supply power to the electrical equipment. Also,
Of the ST power supply line, the + B power supply main line, the ACC power supply main line, and the IG power supply main line, the electrical components that need to be supplied with power from the power supply lines that are not spread over the entire vehicle are directly connected to the power supply box as in the conventional case. Power is being supplied.

The three power source main lines of the + B power source line, the ACC power source main line, and the IG power source main line may be bundled and arranged.
(Claim 3) Alternatively, the four power supply lines of the + B power supply line, the ACC power supply main line, the IG power supply main line, and the ST power supply main line connected to the start position of the ignition switch may be bundled and arranged. (Claim 4)

As described above, when the required power supply trunk line is laid all over the vehicle, the distance between the electrical equipment installed in the vehicle and the power supply trunk becomes short, and the power source trunk and the electrical equipment at the shortest position are electrically connected. If the power supply branch line on the product side is used for connection, the length of the power supply branch line can be made extremely short. Furthermore, when the optional electric component is retrofitted, it is only necessary to connect it to the power supply main line near the mounting position of the electric component, and the optional electric component can be easily retrofitted.

The power supply branch line is connected to the power supply trunk line via a fuse, and an electric wire having a diameter smaller than that of the power supply trunk line is used.
(Claim 5) It is preferable to use, as the fuse, a pressure-bonding fuse having a pair of wire pressure-bonding portions for respectively pressure-bonding to the power supply main line and the power supply branch line, and providing a fuse portion between these wire pressure-bonding portions. . (Claim 6)

When the power supply main line is connected to the power supply main line via the fuse at the position closest to the electric component, the power supply branch line on the electric component side can be downsized and the length of the power supply branch line can be shortened. In addition, the weight of the electric wire can be reduced. In addition, since a fuse is provided for each electrical component, even if the fuse is blown, the power is not supplied to only one electrical component. The problem that the supply is stopped disappears. Further, as described in claim 6, by using the pressure contact fuse, the connection between the power supply main line and the power supply branch line and the interposition of the fuse can be performed at the same time.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment, and a + B power supply main line 1 directly connected to a battery.
0 (indicated by a thick solid line in the figure) and the IG power trunk line 20 connected to the ignition position of the ignition switch
(Indicated by a thick dashed line in the figure) is the left and right lengths of the cowl panel of the vehicle, the left and right sides of the engine room and the front side L2, the left and right sides of the vehicle compartment L3 and L4, and the rear left and right lengths L5 and It is spread all over.

The + B power supply main line 10 is connected to the + side of the battery 1 installed in the engine room E, and the IG power supply main line 20 is connected to the ignition position of the ignition switch. These + B power trunk line 1
0 and the IG power supply main line 20 are continuous with the above L1 to L5, but a part thereof, for example, the central portion of the rear left and right entire length L5 is open and is not looped.

Although not shown in FIG. 1, the ACC
The electrical equipment that is supplied with power from the power supply line and the ST power supply line includes the power supply box 2 arranged in the engine room E or the power supply box (illustrated in FIG. 5) arranged in the front of the vehicle compartment and the electric equipment. Connected through.

In contrast to the + B power source main line 10 and the IG power source main line 20 which are stretched over the entire vehicle body as described above, the electrical component 4 mounted on the automobile is connected to the power source main line 10 or 20 via the power source branch line 30 at the shortest position. You are connected to either.

For example, the electrical equipment 4A arranged in the front part of the engine room E is connected to the + B power supply main line 10 at the position of the front part of the engine room in the L2 section through the power supply branch line 30 (30A). In addition, the electrical component 4B arranged at the rear of the passenger compartment
Is connected to the IG power supply trunk line 20 on the left side of the L5 section via a power supply branch line 30B. Further, as shown in FIGS. 1 and 2, the electric component 4C arranged along the cowl panel is connected to the IG power supply main line 20 and the power supply branch line 30C at the central position of the L1 section, and the electric component 4D is +
The B power supply main line 10 and the power supply branch line 30D are connected.

The + B power supply main line 10 or the IG power supply main line 20 and the power supply branch lines 30 (30A to 30D) are connected by using a pressure contact fuse 40 shown in FIG. The pressure contact fuse 40 is composed of a pair of wire pressure contact parts 4 made of a conductive metal plate.
1 and 42 are provided, slots 41a and 42a having lower end openings are provided on the lower side of the wire pressure contact portions 41 and 42, and pressure contact blades 41b and 42b are formed on the inner peripheral edges of the slots 41a and 42a. The power supply trunk line 10 or 20 is inserted into one of the slots 41a, and the insulation coating is cut by a press contact blade to connect the core wires 10a and 20a with pressure contact, while the power supply branch line 30 is inserted into the other slot 42a and the core wire is connected with the press contact blade. 30a
It is pressure-connected with. Therefore, the slot 41a is formed larger than the slot 42a.

The upper ends of the pair of wire pressure contact parts 41 and 42 are connected by a fuse part 43 made of a narrow conductive metal plate, and the fuse part 43 and the wire pressure contact parts 41 and 4 are connected.
The upper part of 2 is embedded in the substrate part 44 made of an insulating material.

As described above, the power supply main line 10 or 20
If any of the above is connected to the power supply branch line 30 by using the pressure contact fuse 40, the power supply trunk line and the power supply branch line can be connected and the fuse can be interposed at the same time.

In the power distribution wire harness having the above structure, most of the electrical components mounted in the vehicle are designed to supply power from the + B power supply trunk line 10 or the IG power supply trunk line 20, so that the + B power supply trunk line 10 and Since the IG power supply main line 20 is stretched around the vehicle body, many electric components are installed in the shortest position of the power supply main line 10 or 2 described above.
0 through the power supply branch line 30 and the fuse 40 to shorten the length of the power supply branch line 30. Further, since the fuse 40 is provided, the size of the power supply branch line 30 can be reduced, and the diameter of the wire branch line 30 can be reduced.

Further, when the optional electric component is retrofitted, as shown in FIG. 1, if the optional electric component 50 is arranged in the rear part of the vehicle compartment, the power supply trunk line 1 wired in the rear part of the vehicle compartment is shown.
0 or 20 can be connected, and power can be easily supplied to the optional electric component 50.

FIG. 4A shows a second embodiment of the present invention, in which the + B power supply main line 10 and the IG power supply main line 20 are used together with the ACC.
The power supply main line 60 is stretched all over the vehicle as in FIG. According to the second embodiment, the electrical equipment that needs to be connected to the ACC power supply main line 60 is also located at the shortest position A.
It becomes possible to connect with the CC power supply main line 60.

FIG. 4B shows a third embodiment of the present invention, in which, in addition to the + B power supply main line 10, the IG power supply main line 20, the ACC power supply main line 60, an ST power supply main line 70 is provided over the entire automobile as in FIG. It's stretched around. According to the third embodiment, all electric components mounted in the automobile can be connected to the power supply trunk line at the shortest position.

In the case of the second and third embodiments,
It is not necessary to extend all three power supply trunk lines or all four power supply trunk lines in the entire vehicle, and wiring may be performed up to a required position near the electrical component to be connected. It is preferable that a plurality of power supply trunk lines extending around the inside of the automobile are bound together by tape winding or the like, and the binding is released at the connection position with the power supply branch line.

Also, + B directly connected to the battery
At least two of the three power trunk lines, namely, the power trunk line, the ACC power trunk line connected to the accessory position of the ignition switch, and the IG power trunk line connected to the ignition switch ignition position A configuration may be adopted in which the electrical components installed in the vehicle are connected to the power supply trunk line at the shortest position via the power supply branch line by arranging only the right and left entire lengths. Even if the cowl panel is installed only on the right and left entire lengths in this manner, the most electric components are mounted on the inner side of the instrument panel where the cowl panel is installed, which is preferable.

[0030]

As is apparent from the above description, according to the first to fourth aspects of the present invention, the power supply main line is stretched at least over the entire left and right sides of the cowl panel, and preferably over the entire interior of the automobile. Therefore, the connection distance to the electric component can be shortened, and the length of the power supply branch line connecting the power supply main line and the electric component can be shortened. Therefore, the amount of electric wires used is reduced, the weight of the wire harness can be reduced, and the cost can be reduced. Further, even when the electrical equipment is retrofitted, it is only necessary to connect it to the power supply trunk line at the shortest position via the electric wire branch line, so that the electrical equipment retrofitted can be installed at any position.

According to claims 5 and 6,
To connect the wire branch line to the wire trunk line via the fuse,
The diameter of the wire branch line can be reduced, and the weight of the wire harness can be reduced. Further, the use of the pressure contact fuse has an advantage that the power supply main line and the electric wire branch line can be connected and the fuse can be interposed at the same time. Moreover, if a fuse is attached to each electrical component, there is an advantage that when the fuse is blown, the power is not supplied only to the connected electrical component and other electrical components are not affected.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a first embodiment of the present invention.

FIG. 2 is a partially enlarged view of the first embodiment.

FIG. 3A is a perspective view of a press-contact fuse used in the harness of the first embodiment, and FIG. 3B is a cross-sectional view showing a state in which a power supply trunk line and a power supply branch line are press-contacted to the press-contact fuse.

FIG. 4A is a perspective view showing a power supply trunk line group according to a second embodiment, and FIG. 4B is a perspective view showing a power supply trunk line group according to a third embodiment.

FIG. 5 is a schematic plan view showing a conventional power distribution system.

FIG. 6 is a schematic diagram showing a conventional power distribution circuit.

[Explanation of symbols]

 1 Battery 2 Power Supply Box 4 Electrical Equipment 10 + B Power Supply Main Line 20 IG Power Supply Main Line 30 (30A to 30D) Power Supply Branch Line 40 Pressure Contact Fuse 41, 42 Wire Pressure Contact Part 43 Fuse Part 50 Optional Electrical Equipment 60 ACC Power Supply Main Line 70 ST Power Main Line

Claims (6)

[Claims] 1. A power supply main line of + B power supply main line directly connected to a battery, an ACC power supply main line connected to an accessory position of an ignition switch, and an IG power supply main line connected to an ignition position of an ignition switch. At least two power supply trunk lines are arranged at least on the left and right sides of the cowl panel of the car, and electrical components mounted on the car are connected to the shortest power supply trunk line via the power supply branch line. Wire harness for automobile power supply circuit. 2. A power supply main line of + B power supply directly connected to a battery, an ACC power supply main line connected to an accessory position of an ignition switch, and an IG power supply main line connected to an ignition position of an ignition switch. At least two power supply trunk lines are installed in the car, with the entire length of the car cowl panel left and right, the left and right sides of the engine room and the front side, the left and right sides of the passenger compartment and the rear left and right lengths, and the entire inside of the car. A wiring harness for a power supply circuit of an automobile, characterized in that the electric component is connected to the power supply trunk line at the shortest position via a power supply branch line. 3. The + B power supply main line, the ACC power supply main line, I
The wire harness for a power supply circuit of an automobile according to claim 1 or 2, wherein the three power supply main lines of the G power supply main line are bundled and arranged. 4. The + B power supply main line, the ACC power supply main line, I
The wire harness for a power supply circuit of an automobile according to claim 1 or 2, wherein the four power supply main lines of the G power supply main line and the ST power supply main line connected to the start position of the ignition switch are bundled and arranged. 5. The wire for a power supply circuit of an automobile according to claim 1, wherein the power supply branch line is connected to the power supply trunk line via a fuse, and an electric wire having a diameter smaller than that of the power supply trunk line is used. Harness. 6. The fuse according to claim 5, wherein the fuse has a pair of electric wire press contact portions for press contacting the power supply main line and the power supply branch line, respectively, and a fuse portion is provided between the electric wire press contact portions. A wire harness for a power supply circuit of an automobile as described.