JP2023169974A - wire harness - Google Patents

Abstract

To provide a wire harness which is capable of performing inter-wire cutoff between electric wires and grounding of a braised conductor and capable of easily assembling a wiring material from an indoor side to a mounting panel.SOLUTION: In a wire harness WH, in a state where a grommet unit comprising a first grommet 10 and a second grommet 20 is mounted in a penetration hole 101 of a mounting panel 100, a braised conductor Wh and a bracket 30 are electrically connected by a shield ring SR. In an insertion state where a portion of the bracket 30 is inserted into the penetration hole 101, a flange part 32 is opposed with an indoor side face 102 in an extension direction. A cylindrical part 31 protrudes from an outdoor side face 103 to an outdoor side, a stud bolt 106 is inserted into a bolt insertion hole, a nut is screwed to the stud bolt 106 and the flange part 32 is fastened to the mounting panel 100, such that the bracket 30 and the mounting panel 100 are electrically connected.SELECTED DRAWING: Figure 4

Description

The present invention relates to a wire harness.

When installing high-voltage shielded wiring material under the floor of the vehicle in a vehicle such as an electric vehicle, the shielded wiring material may be formed on a mounting panel that separates the exterior and interior of the vehicle as necessary. The cable is inserted through the through hole. Examples of such shielded wiring materials include those to which a grommet structure having a body earth structure and a water-stopping function is applied (see, for example, Patent Document 1).

Japanese Patent Application Publication No. 2005-192279

Conventionally, when assembling a grommet with a sheet metal through which a wiring material is inserted into a through hole in a mounting panel, the assembly work is done from the outside side, but due to a change in the order of the vehicle assembly process, it is now possible to assemble it from the inside side. It may be necessary. When assembling work from the indoor side, compared to assembling work from the outdoor side, it is not easy to ground the braided conductor by electrically connecting the braided conductor covering the wiring material to the mounting panel. It is not easy to achieve both the grounding of the braided conductor and the water stop between the wires.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wire harness that is capable of water-stopping between electric wires and grounding a braided conductor, and that allows wiring materials to be easily assembled from the indoor side to a mounting panel.

In order to achieve the above object, the wire harness according to the present invention includes at least one wire that is inserted into a through hole penetrating from the indoor side to the outdoor side of a mounting panel that separates the indoor and outdoor areas of a vehicle. a braided conductor that is electrically conductive and covers an outer peripheral surface of the wiring material that is located on the outdoor surface side in the extending direction; a bracket that is attached to the mounting panel in a state where the wiring material is inserted through the opening and a portion thereof is inserted into the through hole; and an end portion of the braided conductor on the outdoor surface side is fixed to the bracket. an annular shield ring that electrically connects the braided conductor and the bracket; and a shield ring that is disposed between the bracket and the wiring material and shuts off water between the bracket and the wiring material. a second grommet that is disposed between the bracket and the through hole to shut off water between the bracket and the mounting panel, and the bracket is provided with a second grommet through which the wiring material is inserted. a cylindrical portion; an annular flange portion protruding from one end of the cylindrical portion in a direction perpendicular to the extending direction; and a ring-shaped flange portion extending through the flange portion in the extending direction; at least a pair of bolt insertion holes provided on an indoor side surface into which fastening members are inserted, and in an inserted state in which a part of the bracket is inserted into the through hole, the flange portion extends in the extending direction. The cylindrical portion faces the indoor side surface and protrudes from the outdoor side surface toward the outdoor side, and the fastening member is inserted into the bolt insertion hole, and the fastened member is screwed into the fastening member to attach the fastening member. The bracket and the mounting panel are electrically connected by fastening the flange portion to the panel.

According to the wire harness according to the present invention, it is possible to stop water between the electric wires and ground the braided conductor, and the wiring material can be easily assembled from the indoor side to the mounting panel. .

FIG. 1 is a perspective view of a wire harness according to an embodiment. FIG. 2 is an exploded perspective view of the wire harness according to the embodiment. FIG. 3 is an exploded perspective view of the wire harness according to the embodiment. FIG. 4 is a cross-sectional view of the wire harness according to the embodiment.

Embodiments according to the present invention will be described in detail below with reference to the drawings. Note that the present invention is not limited to the following embodiments. That is, the components in the following embodiments include those that can be easily imagined by a person skilled in the art, or those that are substantially the same, and various omissions, substitutions, and changes may be made without departing from the gist of the invention. It can be carried out.

[Embodiment]
The wire harness WH of this embodiment shown in FIG. 1 is, for example, a high-voltage shielded wiring material that is wired under the floor of a vehicle such as an electric vehicle. The wire harness WH includes two wiring materials W, a braided conductor Wh for shielding the wiring materials W, and a grommet unit 1 into which the two wiring materials W are inserted. The wire harness WH is inserted and wired through a through hole 101 formed in a mounting panel 100 that separates the outside (for example, the engine compartment) and the interior (for example, the cabin) of a vehicle (not shown). The mounting panel 100 is, for example, a single electrically conductive metal plate that constitutes the body of a vehicle. The through hole 101 penetrates from the indoor side surface 102 of the mounting panel 100 to the outdoor side surface 103, as shown in FIGS. 1 and 2. In other words, the through hole 101 passes through the mounting panel 100 along the thickness direction. A grommet unit 1 having a body ground structure and a water stop function is assembled into the through hole 101 . The mounting panel 100 is an example of a fastening member, and has a pair of stud bolts 105 and 106 that protrude from the interior side surface 102, as shown in FIG. A pair of stud bolts 105 and 106 are provided at opposing positions with the through hole 101 in between.

In addition, in the following description, the illustrated X direction is the extending direction of the wire harness WH in this embodiment. The Y direction is a first direction perpendicular to the extending direction of the wire harness WH in this embodiment. The first direction is, for example, the direction in which the two wiring members W in the wire harness WH are arranged. The Z direction is a second direction perpendicular to the first direction and the extending direction of the wire harness WH in this embodiment. It is assumed that the X direction, Y direction, and Z direction are orthogonal to each other. The first direction and the second direction are not limited to the vertical direction and the horizontal direction perpendicular to the vertical direction. The first direction and the second direction correspond to the direction in which the mounting panel 100 extends. The extending direction in this embodiment corresponds to the thickness direction of the mounting panel 100 described above, and corresponds to the direction in which the wiring material W and the grommet unit 1 are inserted into the through hole 101. Here, in order to make the explanation easier to understand, the explanation will be made assuming that the two wiring members W are wired linearly along the extending direction, but the grommet unit 1 is not limited to this, and the grommet unit 1 is attached to the mounting panel. The two wiring members W inserted through the grommet unit 1 may be partially bent or curved so as to deviate from the extending direction when attached to the grommet unit 100. Moreover, each direction used in the following description is explained as a direction in a state where the grommet unit 1 is assembled to the mounting panel 100 unless otherwise specified.

The grommet unit 1 is applied to the through hole 101 when wiring the wiring material W across two spaces (an outdoor space and an indoor space) divided by the mounting panel 100 as a boundary. The grommet unit 1 is attached to the through hole 101 with the wiring material W inserted into the through hole 101 of the mounting panel 100, and the collars 120, 121 are connected by stud bolts 105, 106 and nuts 110, 111 which are fastened members. It is fixed to the indoor side surface 102 of the mounting panel 100 via.

The wiring material W is composed of, for example, an electric wire. An electric wire has a conductor part (core wire) made of a plurality of conductive metal wires, and the outside thereof is covered with an insulating covering part. Here, the wiring material W is, for example, a thick electric wire used in a high voltage system.

The braided conductor Wh covers and shields the outer circumferential surface located on the outdoor side surface of the outer circumferential surface of the wiring material W in the extending direction. The braided conductor Wh is formed into a cylindrical shape by weaving a plurality of conductive braided wires into a mesh shape. Note that in the braided conductor Wh shown in FIGS. 1 and 4, the mesh shape in the braided conductor Wh is omitted for convenience of illustration. One end of the braided conductor Wh in the extending direction is electrically connected to the grommet unit 1 and grounded via the grommet unit 1 and the grounding member of the mounting panel 100 . Grommet unit 1 is electrically connected to braided conductor Wh.

The grommet unit 1 is assembled into the through hole 101 with the wiring material W of the wire harness WH inserted therethrough and wrapped around the wiring material W, thereby electrically connecting the braided conductor Wh to the mounting panel 100. This is to ground the through hole 101 and to make the through hole 101 waterproof. The grommet unit 1 has functions such as protecting the wiring material W passing through the through hole 101 and waterproofing the through hole 101, as well as dustproofing and sound insulation. The grommet unit 1 includes a bracket 30, a first grommet 10, a second grommet 20, and a shield ring SR.

The bracket 30 is made of a conductive metal material or the like. As shown in FIG. 1, the bracket 30 is attached to the mounting panel 100 in an inserted state in which a portion thereof is inserted into the through hole 101. The bracket 30 is open at both ends in the extending direction, and the wiring material W is inserted therethrough. The bracket 30 is supported by the mounting panel 100 via the second grommet 20 in the inserted state. The bracket 30 supports the two wiring members W via the first grommet 10 in the inserted state. As shown in FIGS. 2 to 4, the bracket 30 includes a cylindrical portion 31, a flange portion 32, and a closing portion 33.

The cylindrical portion 31 extends in the extending direction, and is a portion into which the two wiring materials W are inserted along the extending direction when the two wiring materials W are inserted into the bracket 30 . The cylindrical portion 31 has an elliptical shape having a major axis and a minor axis when viewed from the extending direction, and two wiring members W are arranged along the major axis direction. The cylindrical part 31 has a flange part 32 connected to one indoor end in the extending direction, and a closing part 33 to the other outdoor end.

The flange portion 32 is an annular portion that protrudes from the indoor end of the cylindrical portion 31 in a direction perpendicular to the extending direction. The flange portion 32 extends radially outward of the cylindrical portion 31 . The flange portion 32 has a substantially rectangular shape when viewed from the extending direction. The flange portion 32 has substantially the same shape as the second grommet 20 when viewed from the extending direction. The flange portion 32 has a pair of bolt insertion holes 36 and 37 passing through it in the extending direction. The pair of bolt insertion holes 36 and 37 are provided at opposing positions with the second opening 35 in between. The second opening 35 penetrates in the extending direction and has an oval shape when viewed from the extending direction. A portion of the second grommet 20 is inserted into the second opening 35 . The stud bolts 105 and 106 of the mounting panel 100 are inserted into the bolt insertion holes 36 and 37 in the above-mentioned insertion state.

The closing portion 33 is an annular portion that protrudes from the outdoor end of the cylindrical portion 31 in a direction perpendicular to the extending direction. The closing portion 33 extends radially inward of the cylindrical portion 31 . The closing portion 33 has a first opening 34 that penetrates in the extending direction. The first opening 34 has an oval shape when viewed from the extending direction. The first grommet 10 is attached to the first opening 34 .

The first grommet 10 is arranged between the bracket 30 and the wiring material W, and serves to shut off water between the bracket 30 and the wiring material W. As shown in FIGS. 2 to 4, the first grommet 10 includes a main body portion 11, a cylindrical portion 12, and a connecting portion 13, which are integrally formed as an elastic body. The first grommet 10 is formed of an insulating elastic resin material (eg, ethylene-propylene-diene rubber (EPDM)) having low rigidity and high flexibility, such as rubber or thermoplastic elastomer.

The main body part 11 shuts off water between the closing part 33 and the wiring material W in a state where the first grommet 10 is attached to the first opening 34 of the bracket 30, and also prevents water from entering the wiring material along the extending direction. W is the part to be inserted. The main body portion 11 includes an outdoor water stop portion 14A and an indoor water stop portion 14B, and is formed in a cylindrical shape as a whole.

The outdoor water stop portion 14A is formed in an annular shape so as to surround the first opening 34 of the bracket 30. The outdoor water stop portion 14A is a portion that comes into contact with the outdoor side surface 33A, which is configured as one surface in the extending direction of the closing portion 33, and shuts off water between the outdoor side surface 33A and the outdoor side surface 33A. The outdoor water stop portion 14A includes a first water stop protrusion 15. The first water stop protrusion 15 is provided at the radially outer end of the outdoor water stop part 14A, and is formed in a protruding shape with its tip facing the outdoor side surface 33A, and is annularly shaped in the outdoor water stop part 14A. It is formed as an annular outer periphery. When the first grommet 10 is attached to the first opening 34, the outdoor water stop portion 14A is in close contact with the outdoor side surface 33A of the periphery of the first opening 34 due to elastic deformation, and the entire surface of the first opening 34 is closed. Configured to seal around the periphery.

The indoor water stop part 14B is formed in an annular shape so as to surround the first opening 34 of the bracket 30. The indoor water stop portion 14B is a portion that comes into contact with the indoor side surface 33B, which is configured as the other surface in the extending direction of the closing portion 33, and shuts off water between the indoor side surface 33B and the indoor side surface 33B. When the first grommet 10 is attached to the first opening 34, the indoor water stop portion 14B comes into close contact with the indoor side surface 33B at the periphery of the first opening 34 due to elastic deformation, and covers the entire first opening 34. Configured to seal around the periphery.

The cylindrical portion 12 extends in the extending direction, and in a state where the two wiring materials W are inserted into the bracket 30, the wiring materials W are inserted inside the tubular portion 12 along the extending direction. The cylindrical portion 12 is provided integrally with the connecting portion 13 and is connected to the main body portion 11 via the connecting portion 13 . The cylindrical portion 12 is configured to extend along the extending direction from the connecting portion 13 so as to be away from the outdoor side surface 103 of the mounting panel 100 and to penetrate through the connecting portion 13 . The wiring material W inserted into the cylindrical portion 12 is disposed so as to penetrate through the main body portion 11 . A plurality of cylindrical portions 12 are formed side by side. Two cylindrical portions 12 are formed side by side along the first direction. One cylindrical portion 12 allows one wiring material W to be inserted therethrough. One wiring material W is configured as one electric wire. When the first grommet 10 is attached to the first opening 34, the cylindrical part 12 is elastically deformed and comes into close contact with the outer circumferential surface of the wiring material W on the outdoor side. configured to seal the entire outer circumferential surface of the

The connecting portion 13 is provided so as to surround the cylindrical portion 12 and is formed to connect the cylindrical portion 12 and the main body portion 11 . As shown in FIG. 4, the connecting portion 13 has a substantially S-shaped cross section and is allowed to bend in the extending direction, the first direction, and the second direction.

The second grommet 20 is arranged between the bracket 30 and the through hole 101 and serves to shut off water between the bracket 30 and the mounting panel 100. As shown in FIGS. 2 to 4, the second grommet 20 includes a main body portion and a flange portion 22, which are integrally formed as an elastic body. Like the first grommet 10, the second grommet 20 is made of an insulating elastic resin material having low rigidity and high flexibility, such as rubber or thermoplastic elastomer (e.g., ethylene-propylene-diene rubber (EPDM), etc.). ) formed by

The main body portion 21 extends in the extending direction, and is a portion into which the two wiring materials W are inserted in a state where the two wiring materials W are inserted into the bracket 30 . The main body part 21 has an elliptical shape having a major axis and a minor axis when viewed from the extending direction, and two wiring members W are arranged along the major axis direction. A flange portion 22 is connected to the main body portion 21 at one end portion on the indoor side in the extending direction.

The flange portion 22 is an annular portion that protrudes from the outdoor end of the main body portion 21 in a direction perpendicular to the extending direction. The flange portion 22 extends radially outward of the main body portion 21 . The flange portion 22 has a substantially rectangular shape when viewed from the extending direction. The flange portion 22 has a pair of through holes 26 and 27 that penetrate in the extending direction. The pair of through holes 26 and 27 are provided at opposing positions with the opening 28 in between. The opening 28 penetrates in the extending direction and has an oval shape when viewed from the extending direction. The cylindrical portion 31 of the bracket 30 is inserted into the opening 28 . The stud bolts 105 and 106 of the mounting panel 100 are inserted into the through holes 26 and 27 in the above-mentioned insertion state. The flange portion 22 includes second water-stop protrusions 23, 24, and 25.

The second water stop protrusion 23 is provided on the outdoor side surface of the flange portion 22 and is formed into a protruding shape with a tip facing toward the outdoor side, and is formed along the annular shape of the main body portion 21 . The second water stop protrusion 23 faces the indoor side surface 102 of the mounting panel 100 in the extending direction when the bracket 30 is supported by the mounting panel 100 via the second grommet 20 .

The second water stop protrusions 24 and 25 are provided on the indoor side surface of the flange portion 22, and are formed in a protruding shape so that the tips thereof face toward the indoor side, and are formed along the opening 28. The second water stop protrusions 24 and 25 face the flange portion 32 of the bracket 30 in the extending direction when the bracket 30 is supported by the mounting panel 100 via the second grommet 20. The second water stop protrusion 24 is located inside the second water stop protrusion 25 when viewed from the extending direction, and is provided in plural on the flange portion 22 .

As shown in FIGS. 1 and 4, the shield ring SR fixes the end of the braided conductor Wh on the outdoor surface side to the bracket 30, and electrically connects the braided conductor Wh and the bracket 30. The shield ring SR is made of a conductive metal material or the like, and is formed into an annular shape. The shield ring SR is fixed to the bracket 30 with the end of the outdoor surface of the braided conductor Wh sandwiched between the shield ring SR and the outer peripheral surface of the cylindrical portion 31 of the bracket 30.

Next, an installation procedure that is a method of installing the wire harness WH using the grommet unit 1 will be described. It is assumed that the wire harness WH is inserted into the through hole 101 of the mounting panel 100, and the grommet unit 1 is located on the indoor side. First, while inserting the grommet unit 1 into the through hole 101 from the indoor side of the mounting panel 100, the stud bolts 105, 106 are inserted into the bolt insertion holes 36, 37 and the through holes 26, 27. In this case, the second grommet 20 is inserted into the through hole 101 from the first grommet 10 side, and the main body portion 21 of the second grommet 20 is brought into contact with the periphery of the through hole 101 . Then, the main body portion 21 is positioned on the outdoor side of the through hole 101 and the second grommet 20 is pushed in so that the flange portion 22 contacts the indoor side surface 102 of the mounting panel 100 . Next, after inserting the collars 120, 121 into the indoor end portions of the stud bolts 105, 106, the nuts 110, 111 are screwed onto the stud bolts 105, 106. Then, the grommet unit 1 is fixed to the mounting panel 100 by tightening the nuts 110 and 111 using a tightening tool such as an impact wrench, an air driver, or a nut runner.

As shown in FIG. 4, the braided conductor Wh in this embodiment is fixed to the bracket 30 by the shield ring SR in a state where the grommet unit 1 in the wire harness WH is assembled to the mounting panel 100. electrically connected. When the grommet unit 1 is assembled to the mounting panel 100, a portion of the bracket 30 described above is inserted into the through hole 101. In the inserted state, the bracket 30 has the flange portion 32 facing the indoor side surface 102 in the extending direction, the cylindrical portion 31 protruding from the outdoor side surface 103 to the outdoor side, and the stud bolts 105 and 105 in the bolt insertion holes 36 and 37. 106 is inserted. Then, the nuts 110 and 111 are screwed onto the stud bolts 105 and 106, and the flange portion 32 is fastened to the mounting panel 100, thereby electrically connecting the bracket 30 and the mounting panel 100. Thereby, the braided conductor Wh can be grounded even during the assembly work of assembling the grommet unit 1 to the mounting panel 100 from the indoor side.

As described above, in the wire harness WH according to the present embodiment, in the inserted state where a part of the bracket 30 is inserted into the through hole 101, the flange portion 32 faces the indoor side surface 102 in the extending direction, and the The shaped portion 31 protrudes from the outdoor side surface 103 toward the outdoor side, and the stud bolts 105 and 106 are inserted into the bolt insertion holes 36 and 37, and the nuts 110 and 111 are screwed into the stud bolts 105 and 106 to attach the mounting panel 100. By fastening the flange portion 32, the bracket 30 and the mounting panel 100 are electrically connected.

With the above configuration, the bracket 30 can be attached to the mounting panel 100 from the indoor side with the braided conductor Wh fixed to the bracket 30, and the wiring material W can be easily attached to the mounting panel 100 from the indoor side. can be assembled into. In addition, since water is cut off between the bracket 30 and the wiring material W by the first grommet 10, and water is cut off between the bracket 30 and the mounting panel 100 by the second grommet 20, assembly work is performed from the indoor side. It is also possible to stop water between the electric wires. Furthermore, the stud bolts 105 and 106 of the mounting panel 100 are inserted into the bolt insertion holes 36 and 37 of the bracket 30, and the nuts 110 and 111 are screwed into the stud bolts 105 and 106, thereby fastening the flange portion 32 to the mounting panel 100. As a result, the bracket 30 and the mounting panel 100 are electrically connected, so that the braided conductor Wh can be grounded even during assembly work from the indoor side. In this way, water can be stopped between the electric wires and the braided conductor Wh can be grounded, and the wiring material W can be easily assembled to the mounting panel 100 from the indoor side.

Note that the wire harness WH according to the embodiment of the present invention described above and the method of attaching the wire harness WH are not limited to the embodiment described above, and various changes can be made within the scope of the claims. be. Further, the wire harness WH according to the present embodiment may be configured by appropriately combining the components of the embodiment and the modified example described above. Further, the wire harness WH may include various components such as a corrugated tube, a resin tape, an exterior member such as a protector, an electrical connection box, and a fixture.

Further, in the above embodiment, the wiring material W was described as being constituted by a thick electric wire used in a high voltage system, but the wiring material W is not limited to this, and may be constituted by a metal rod, a bundle of electric wires, or the like. A metal rod is a rod-shaped member that is electrically conductive and covered on the outside with an insulating coating. A wire bundle is a bundle of wires.

Further, in the above embodiment, the cylindrical portion 31 has an oval shape when viewed from the extending direction, but is not limited to this, and may have a circular shape. Moreover, when the number of wiring members W is one, the shape of the cylindrical portion 31 viewed from the extending direction may be circular.

1 Grommet unit 10 First grommet 20 Second grommet 30 Bracket 31 Cylindrical part 32 Flange part 36, 37 Bolt insertion hole 100 Mounting panel 101 Through hole 102 Indoor side surface 103 Outdoor side surface 105, 106 Stud bolt 110, 111 Nut WH Wire harness W Routing material Wh Braided conductor SR Shield ring

Claims (1)

At least one wiring member inserted into a through hole penetrating from the indoor side to the outdoor side of a mounting panel that separates the indoor and outdoor areas of the vehicle;
A braided conductor that has conductivity and covers an outer circumferential surface located on the outdoor side surface of the outer circumferential surface in the extending direction of the wiring material;
a bracket that is electrically conductive and is attached to the mounting panel in a state where both ends in the extending direction are open, the wiring material is inserted therethrough, and a portion is inserted into the through hole;
an annular shield ring that fixes an end of the outdoor surface side of the braided conductor to the bracket and electrically connects the braided conductor and the bracket;
a first grommet that is disposed between the bracket and the wiring material and stops water between the bracket and the wiring material;
a second grommet disposed between the bracket and the through hole to shut off water between the bracket and the mounting panel;
The bracket is
a cylindrical portion through which the wiring material is inserted;
an annular flange portion protruding from one end of the cylindrical portion in the extending direction in a direction perpendicular to the extending direction;
at least a pair of bolt insertion holes passing through the flange portion in the extending direction and into which fastening members provided on the indoor side surface are inserted;
In an inserted state in which a part of the bracket is inserted into the through hole, the flange portion faces the indoor side surface in the extending direction, and the cylindrical portion protrudes from the outdoor side surface toward the outdoor side, and the fastening member is inserted into the bolt insertion hole,
A fastened member is screwed into the fastening member and the flange portion is fastened to the mounting panel, thereby electrically connecting the bracket and the mounting panel.
A wire harness characterized by:

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