JP6883921B2 - Harness wiring structure - Google Patents

Description

The present invention relates to a harness wiring structure including a wire harness provided in a vehicle and an electrical junction box.

A wire harness is used to connect the electrical components installed in the instrument panel of an automobile and the power supply located near the engine. Between the electrical components and the power supply, an electrical junction box including an electric circuit including a fuse or a relay, a relay box in which the relay or the fuse is integrated, a fuse box, or the like is provided. The electrical connection box, relay box, etc. are typically arranged near the glove box, such as on the glove box in the passenger seat (eg, Patent Document 1 [0025], FIGS. 1, 2) or in front of the glove box. To.

In automobiles such as cab-over trucks, a wire harness is pulled out from the rear of the vehicle rather than the front cross member on the floor panel (eg, Patent Document 2, FIG. 2) and connected to an electric junction box or the like. By arranging the wire harness behind the cross member, it is possible to avoid disconnection of the wire harness in a head-on collision.

Japanese Unexamined Patent Publication No. 2017-07795 Japanese Unexamined Patent Publication No. 2015-193342

However, as described above, if the electric connection box or the like is provided near the glove box located on the side in the vehicle width direction, and the wire harness outlet on the floor panel is provided near the center in the vehicle width direction (Patent Document 2, Patent Document 2, FIG. 2), there is a problem that the wiring path from the outlet to the electrical junction box is long. Therefore, it is desired to shorten the wiring path of the wire harness while preventing disconnection at the time of a head-on collision.

Further, if an electric connection box or the like is provided in the vicinity of the glove box, there is a problem that the capacity of the glove box is reduced. Further, when there is an electric connection box or the like in the back of the glove box, it is necessary to remove the glove box when replacing the fuse, and improvement in workability is desired.

Therefore, one of the objects of the present invention is to provide a harness wiring structure capable of shortening the wiring path while preventing disconnection at the time of a head-on collision.

The harness wiring structure according to one aspect of the present invention is
An electrical junction box that is located near the center in the vehicle width direction and is located near the front cross member when viewed from the side.
The floor panel is provided with a wire harness that is pulled out from an opening provided behind the front cross member and substantially directly below the electrical junction box when viewed from the rear, and is connected to the electrical junction box.
The wire harness is
A wire drawing portion extending from the opening to the front along the floor panel,
It is provided with a bent portion that rises from the drawn portion toward the electrical junction box at a position in front of the front cross member.
Arranged in a straight line when viewed from above.

In the above harness wiring structure, since the opening of the floor panel is almost directly below the electric junction box when viewed from the rear, both the electric junction box and the above opening are located near the center in the vehicle width direction. It can be said that the placement positions of the two are close. Moreover, in the above-mentioned harness wiring structure, since the wire harness is arranged in a straight line when viewed from above, it can be said that the wire harness has very few parts arranged along the vehicle width direction. Therefore, in the above harness wiring structure, the wiring path from the opening of the floor panel to the electric junction box is shorter than that in the case where the electric junction box is arranged in the vicinity of the glove box.

Further, in the above harness wiring structure, although the wire harness is pulled out from the rear of the vehicle rather than the front cross member (hereinafter, may be referred to as FC member), it stands up in front of the vehicle and connects to the electric junction box. Will be done. That is, the bent portion of the wire harness is generally arranged in front of the vehicle with respect to the FC member. Therefore, at the time of a head-on collision (hereinafter referred to as a front collision), when the dash panel enters the rear of the vehicle, the bent portion comes into contact with the dash panel and is pushed up before the FC member. However, since the bent portion can be deformed in shape, disconnection can be prevented by deforming the shape. Therefore, in the above-mentioned harness wiring structure, although a part of the wire harness includes a part arranged in front of the FC member, it is possible to prevent disconnection at the time of a front collision.

Further, in the above harness wiring structure, since the electric connection box is arranged near the center in the vehicle width direction, the capacity of the glove box in the passenger seat can be increased, and it is not necessary to remove the glove box when replacing the fuse or the like. ..

It is a left side view which shows the outline of the harness wiring structure of Embodiment 1. FIG. It is a top view which shows the outline of the harness wiring structure of Embodiment 1. FIG. It is a rear view which shows the outline of the harness wiring structure of Embodiment 1. FIG.

Hereinafter, the harness wiring structure of the present invention will be specifically described with reference to the drawings. In the drawings, the same reference numerals indicate the same names.

[Embodiment 1]
The harness wiring structure 1 of the first embodiment will be described with reference to FIGS. 1 to 3.
1 to 3 show a portion of an automobile near the center in the vehicle width direction, near the dash panel 7 provided in front of the vehicle, and near the floor panel 5 provided below the vehicle.
In FIGS. 1 and 2, the front of the vehicle is designated as Fr and the rear of the vehicle is referred to as Rr, which are indicated by arrows.
In FIG. 1, the vertical direction of the paper surface, in FIG. 2, the vertical direction of the paper surface, and in FIG. 3, the left-right direction of the paper surface is the vehicle width direction. In FIGS. 1 and 3, the vertical direction of the paper surface is defined as the vertical direction of the paper surface, and in FIG. 2, the vertical direction of the paper surface is defined as the vertical direction of the vehicle.

(overall structure)
The harness wiring structure 1 of the first embodiment includes a wire harness 2 and an electrical connection box 3 to which the wire harness 2 is connected. The harness wiring structure 1 typically includes an electrical component (not shown) provided in an instrument panel (hereinafter referred to as an instrument panel) 6 of an automobile and a power source (same as above) arranged near a power unit such as an engine. ), And is used for power supply to electrical components and power cutoff. In particular, the harness wiring structure 1 of the first embodiment can be suitably used for a cab-over type automobile (eg, truck, van, etc.) or a pickup truck in which a power unit is provided under the cabin. In this example, a case where the harness wiring structure 1 is installed in a cab-over type automobile will be described.

Although details are not shown, a cab-over type automobile is typically two FCs that connect the left and right side members forming a vehicle body frame and the left and right side members and are arranged apart from each other in the front-rear direction of the vehicle. It has members 8 and 80. In a truck, a cabin is provided in front of the vehicle body frame, and a loading platform is provided in the rear of the vehicle. A power unit is installed below the cabin. Further, a floor panel 5 is provided below the cabin, and a dash panel 7 is erected at the front end of the floor panel 5 in the vertical direction of the vehicle. The instrument panel 6 is mainly provided above the dash panel 7. In FIGS. 1 to 3, the instrument panel 6 and the dash panel 7 are virtually shown by a two-dot chain line.

In the harness wiring structure 1 of the first embodiment, the electric connection box 3 is not arranged near the glove box on the side in the vehicle width direction, but near the center in the vehicle width direction, and the wire harness 2 is pulled out (described later). The opening 50) is located substantially directly below the electrical junction box 3 when viewed from the rear (FIG. 3). The electrical junction box 3 is arranged in the vicinity directly above the FC member 8 (FIG. 1), and the wire harness 2 is pulled out in the rear of the FC member 8 (FIG. 1). Further, the wiring path of the wire harness 2 from the drawer position to the electrical junction box 3 is linear in top view (FIG. 2), and a portion protruding forward of the vehicle from the FC member 8 (bent portion 2b described later) is formed. Has (Fig. 2). In the harness wiring structure 1 of the first embodiment, the pull-out position of the wire harness 2, the arrangement position of the electrical junction box 3, and the wiring path of the wire harness 2 are specified as described above.

Hereinafter, first, the wire harness 2 and the electric junction box 3 will be briefly described, and then the arrangement positions of the wire harness 2 and the electric junction box 3 and the wiring path of the wire harness 2 will be described in detail.

(Wire Harness)
The wire harness 2 includes one or more electric wires to which connectors (not shown) are attached to both ends, and typically includes a wire bundle in which a plurality of electric wires 20 are bundled. Each electric wire 20 includes a conductor wire made of a metal such as copper and an insulating coating provided on the outer periphery of the conductor wire. Here, the wire harness 2 including the protective tube 21 for accommodating a general area except for the end of the electric wire bundle is illustrated, but the protective tube 21 may be omitted.

(Electrical junction box)
The electric junction box 3 typically includes a circuit assembly in which electric circuits including fuses, relays, etc. are integrated, a connector portion to which the connector of the electric wire 20 described above is connected, a circuit assembly, and a connector portion. It is provided with a case for storing (details are not shown), and is used for branch connection of the wire harness 2. FIG. 3 exemplifies a circuit assembly (large rectangular portion on the left side in FIG. 3) and a part of a connector portion (small rectangular portion on the right side in FIG. 3) arranged side by side in the vehicle width direction and stored in a case. To do.

(Positions)
The electric junction box 3 is provided near the center in the vehicle width direction, and is provided in the vicinity directly above the FC member 8 in a side view as shown in FIG. The “near the center in the vehicle width direction” includes the center in the vehicle width direction, and includes an area in the instrument panel 6 where an operation panel of an air conditioner, an audio device such as a radio, or the like is provided. The following (1) to (3) can be mentioned as "provided in the immediate vicinity of the FC member 8".
(1) As shown in FIG. 2, at least a part of the outer shape of the electrical junction box 3 is provided so as to overlap the plane outer shape of the FC member 8 when viewed from above. FIG. 2 illustrates a case where the outer shape of the electric junction box 3 is provided so as to straddle the FC member 8 in the front-rear direction of the vehicle and overlaps the entire plane outer shape of the FC member 8 near the center in the vehicle width direction. To do.
(2) The front end surface of the electric junction box 3 is provided so as to be located slightly behind the rear end surface of the FC member 8 (for example, about the thickness of the electric junction box 3 in the front-rear direction of the vehicle or less) in the top view. ..
(3) When the two FC members 8 and 80 are provided apart from each other in the front-rear direction of the vehicle as in this example, the rear end surface of the electrical junction box 3 is in front of the front end surface of the FC member 80 on the rear side of the vehicle. It is provided so as to be located in. As a more specific example, the electric connection box 3 may be provided so that the rear end surface of the electric connection box 3 and the rear end edge of the opening 50 are located on the same surface in a side view.

The floor panel 5 is provided with an opening 50 behind the FC member 8 (FIGS. 1 and 2) and substantially directly below the electrical junction box 3 when viewed from the rear as shown in FIG. "Provided almost directly under the electrical junction box 3" means that at least a part of the arrangement range in the vehicle width direction at the opening 50 is the vehicle width in the electrical junction box 3 (particularly, the outer shape of the above-mentioned case) in the rear view. It may be provided so as to be included in the arrangement range in the direction. FIG. 3 illustrates a case where the entire area of the arrangement range in the vehicle width direction in the opening 50 is included in the arrangement range in the vehicle width direction in the electrical junction box 3. As described above, it can be said that the opening 50 located substantially directly below the electric junction box 3 when viewed from the rear is located near the center in the vehicle width direction. Therefore, it can be said that the distance between the electric junction box 3 and the opening 50 along the vehicle width direction is short, and in this respect, the arrangement positions of the two are close to each other.

In this example, the grommet 51 attached so as to be in close contact with the wire harness 2 is fitted on the peripheral edge of the opening 50 of the floor panel 5. Further, in this example, a protective member 52 is provided to cover the drawn portion of the wire harness 2 drawn from the opening 50 (not shown in FIG. 2). As shown in FIG. 3, the protective member 52 of this example has a trapezoidal shape in a rear view and a cross-sectional view cut along a plane along the vehicle width direction, and a rectangular shape in a top view. The protective member 52 includes an upper surface portion that covers the upper part of the grommet 51, and a pair of inclined surface portions that are inclined downward from the upper surface portion toward the floor panel 5 and toward the vehicle side. A flange portion extends from the inclined surface portion and is fixed to the floor panel 5 with bolts or the like (not shown). The shape and size of the protective member 52 can be appropriately selected within a range in which the drawer portion can be protected. FIG. 1 illustrates a case where the size of the protective member 52 in the vehicle front-rear direction overlaps the front end of the FC member 80 behind the vehicle from the rear of the vehicle with respect to the FC member 8 in front of the vehicle. Can be changed. The protective member 52 may be omitted.

One end of the wire harness 2 is connected to a power source arranged near the power unit described above, is pulled out from the opening 50 of the floor panel 5 via the lower part of the cabin, and the other end is connected to the electric junction box 3. The pull-out position of the wire harness 2 corresponds to the formation position of the opening 50 described above.

(Route)
The wire harness 2 pulled out from the opening 50 of the floor panel 5 is arranged in front of the vehicle and above the vehicle from the opening 50 toward the electrical junction box 3. Specifically, as shown in FIG. 1, the wire harness 2 extends from the opening 50 toward the front of the vehicle at a wire extending portion 2a extending along the floor panel 5 and at a position in front of the FC member 8. It includes a bent portion 2b that rises from the portion 2a toward the electrical connection box 3, and is arranged in an L shape. The vehicle front end of the wire drawing portion 2a, that is, the vehicle lower end of the bending portion 2b protrudes forward of the vehicle from the FC member 8, and the approximate region of the bending portion 2b is the FC member 8 as shown in FIGS. 1 and 2. It is placed in front of the vehicle. In this example, a connection point with the electric wire 20 in the electric junction box 3 is provided at the rear of the vehicle. Therefore, as shown in FIG. 1, the end portion of the bent portion 2b on the electric junction box 3 side, here, the end portion of each electric wire 20 exposed from the protective tube 21 is arranged so as to be routed from the front of the vehicle to the rear of the vehicle. Will be done.

Further, the wire harness 2 is arranged linearly in a top view as shown in FIG. “Arranged in a straight line” means that the size L in the vehicle width direction in the wiring path of the wire harness 2 (in this example, the wiring path of the portion housed in the protective tube 21 in particular) is the outer diameter of the wire harness 2. It can be mentioned that it is arranged so as to be substantially equal to R (the outer diameter of the protective tube 21 in this example). Quantitatively, the size L of the wiring path in the vehicle width direction is less than twice the outer diameter R of the wire harness 2, preferably 1 times or more and 1.8 times or less. It can be said that such a wiring path of the wire harness 2 straddles the FC member 8 and is arranged in a straight line substantially along the vehicle front-rear direction, and there are very few portions arranged along the vehicle width direction (FIG. 3). See also).

(Main effect)
In the harness wiring structure 1 of the first embodiment, the arrangement position of the electric connection box 3 and the pull-out position of the wire harness 2 (the formation position of the opening 50) are near the center in the vehicle width direction, and the positions of both are close to each other. In addition, the wire harness 2 is arranged in a straight line when viewed from above. Therefore, in the harness wiring structure 1 of the first embodiment, the wiring path from the opening 50 to the electric connection box 3 is shorter than that in the case where the electric connection box 3 is arranged in the vicinity of the glove box. It is preferably the shortest.

Further, in the harness wiring structure 1 of the first embodiment, although the wire harness 2 is pulled out from the rear of the vehicle with respect to the FC member 8, the bent portion 2b is generally arranged in front of the vehicle with respect to the FC member. Therefore, when the dash panel 7 enters the rear of the vehicle at the time of a front collision, the dash panel 7 comes into contact with the bent portion 2b before the FC member 8 and pushes up the bent portion 2b. The bent portion 2b that has been pushed up can be deformed following the pushing operation. Therefore, in the harness wiring structure 1 of the first embodiment, the wire harness 2 is pulled out from the rear of the vehicle from the FC member 8 and includes the bent portion 2b in front of the vehicle from the FC member 8, so that the shape of the bent portion 2b is deformed. This can prevent disconnection at the time of front collision. As a result, fire hazards caused by disconnection can be prevented.

In the harness wiring structure 1 of the first embodiment, from the following points, it is possible to prevent the wire harness 2 from being sandwiched between the dash panel 7 and the peripheral member and being disconnected at the time of front collision.
(1) As described above, since the wire harness 2 is arranged linearly along the vehicle front-rear direction when viewed from above, the bent portion 2b does not easily collapse so as to expand in the vehicle width direction when the shape is deformed.
(2) In the space between the FC member 8 and the dash panel 7 in a top view, the wire harness 2 is bent so as to stand up around the bent portion 2b, and the end of each electric wire 20 is bent into the electric junction box 3 Because of the work of connecting to, there is virtually no intervention of members. Since there is no intervening member between the dash panel 7 and the bent portion 2b, it is possible to prevent disconnection due to being sandwiched between the dash panel 7 and the intervening member.

Further, in the harness wiring structure 1 of the first embodiment, since the electric connection box 3 is arranged near the center in the vehicle width direction, the capacity of the glove box in the passenger seat can be increased. In addition, it is not necessary to remove the glove box when replacing the fuse or the like, and the replacement workability is excellent. If the case provided in the electric junction box 3 is provided with a lid (not shown) that can be opened / closed or detached from the rear surface of the vehicle so that the lid can be opened / closed or detached from the instrument panel 6, the occupant can use a fuse or the like. Easy to replace.

The harness wiring structure 1 of the first embodiment can be changed as follows, for example.
An eaves portion 9 is provided on the upper portion of the electrical junction box 3 (see the two-dot chain line virtually shown in FIG. 3).
In the harness wiring structure 1, the electric connection box 3 is provided near the center in the vehicle width direction and below the vehicle near the floor panel 5. Therefore, the form including the eaves 9 can prevent the dew condensation water from the duct or the like of the air conditioner from dripping and entering the electric connection box 3. The eaves portion 9 shown in FIG. 3 includes a top surface portion that covers the upper surface of the electric junction box 3 and an inclined surface portion that inclines downward from the edge of the top surface portion, and projects to the rear of the vehicle to provide electric wires 20 and electricity. An example is shown in which the upper part of the connection portion with the junction box 3 is covered, but the shape, size, and the like of the eaves portion 9 can be changed as appropriate.

1 Harness wiring structure 2 Wire harness, 2a Wire extension part, 2b Bending part, 20 Electric wire, 21 Protective tube 3 Electrical junction box 5 Floor panel, 50 opening, 51 Grommet, 52 Protective member 6 Instrument panel (instrument panel)
7 Dash panel 8,80 Front cross member (FC member)
9 eaves

Claims (1)

An electrical junction box that is located near the center in the vehicle width direction and is located near the front cross member when viewed from the side.
The floor panel is provided with a wire harness that is pulled out from an opening provided behind the front cross member and substantially directly below the electrical junction box when viewed from the rear, and is connected to the electrical junction box.
The wire harness is
A wire drawing portion extending from the opening to the front along the floor panel,
It is provided with a bent portion that rises from the drawn portion toward the electrical junction box at a position in front of the front cross member.
Harness wiring structure that is arranged linearly when viewed from above.

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