JP5477221B2 - Grommet for wiring harness - Google Patents

Description

  The present invention relates to a grommet for a wire harness, and more specifically, is fitted and fixed to a wire harness routed in a vehicle inserted through a through hole formed in a vehicle body, and is attached to an inner peripheral surface of a through hole provided in a vehicle body panel. The grommet for protecting, waterproofing, dust-proofing and sound-insulating wire harnesses is particularly capable of suppressing variations in the wire group of the wire harness drawn from the grommet.

Conventionally, a grommet is externally mounted on a wire harness that spans between a car body and a door of an automobile, and a car body locking recess provided in an annular shape on the outer peripheral surface of the grommet is engaged with a peripheral edge of a through hole provided in the car body and the door panel. It stops and mounts to prevent and protect the wires of the wire harness from coming into contact with the periphery of the through hole, and prevent water from entering through the through hole.
Tape winding pieces project from the grommet entrances and exits, the wire groups of the wire harness are wound around the tape winding pieces with an adhesive tape and converged, and the grommet is fixed to the required area of the wire harness and the wire harness pulled out from the grommet. The group of wires is converged so that it can be routed in the required direction.

  For example, in the grommet 100 disclosed in Japanese Patent Application Laid-Open No. 2008-230352 shown in FIG. 5, a large-diameter cylindrical portion 102 for bending the bellows cylindrical portion 101 is provided to lock the vehicle body, and the large-diameter cylindrical portion is provided. A vehicle body locking recess 103 and a locking claw 104 are provided on the outer peripheral surface of 102, and a harness guide (so-called tape winding piece, spatula) 106 is bent from the part of the periphery of the front end opening 105 toward the wiring direction. It is protruding. The harness guide 106 is bent together with the wire group of the wire harness, and the adhesive tape 108 is wound around the wire harness W / H and the harness guide 106 and fixed.

JP 2008-230352 A

  As described above, the wire group of the wire harness drawn from the grommet is converged by being wound with the adhesive tape on the tape winding piece protruding from one side of the opening of the grommet, but each wire has a required rigidity. Moreover, since the bending wrinkle is attached, as shown in FIG. 6, the variation of the electric wire group W to the opposite side to the tape winding piece 106 cannot be suppressed. Therefore, when there is an external interference material on the protruding side of the tape winding piece, and the wire harness is wound around the tape winding piece in order to avoid interference with the external interference material, the scattered wires interfere with the external interference material. There is a fear. In addition, a load in the peeling direction acts on the adhesive tape wound by the separated electric wires, and the adhesive tape may eventually be peeled off and the electric wire group drawn out from the grommet may be separated.

In order to suppress the variation in the wire group of the wire harness fixed to the tape winding piece with the adhesive tape, it is conceivable to shorten the extra length of the wire generated in the grommet, but if the wire length is shortened, the flexibility Problems arise in terms of securing.
It is also conceivable that an adhesive tape is wrapped around a group of wires penetrating the inside of the grommet, or the group of wires is converged through the group of wires in the resin tube so as not to generate variations. However, when the exterior material for bundling the electric wire group as described above is arranged inside the grommet, contact friction occurs between the outer peripheral surface of the adhesive material of the adhesive tape or the resin tube and the inner peripheral surface of the hollow portion of the grommet, There is a problem that the grommet is damaged.

Furthermore, as shown in FIG. 7, two tape winding pieces 106A and 106B may protrude from the position facing the exit of the grommet, and may be wound with the adhesive tape T through the wire group W of the wire harness therebetween.
However, when the two points are fixed, the wire harness at the tape winding fixing portion becomes hard and the flexibility is lost. Therefore, when it is necessary to bend and wire the wire harness drawn from the grommet, problems such as difficulty in bending and easy interference with the outer member occur.

  The present invention has been made in order to solve the above-described problem. The number of tape windings projecting from the opening of the grommet is one, and the electric wires are converged toward the one tape winding piece. The problem is to provide a grommet that can be corrected.

In order to solve the above problems, the present invention is a grommet made of rubber or elastomer that is attached to an outer peripheral surface of a wire harness and is attached to a through hole formed in a vehicle body panel,
One tape winding piece for fixing the wire harness is protruded from a part of the opening edge periphery of the insertion hole of the wire harness, and the electric wire drawn out from the insertion hole on the side opposite to the tape winding piece is directed to the tape winding piece side. And project the wire guide piece to guide
The wire guide piece protrudes in an arc shape, the protruding height is lower than the tape winding piece and the width is wider than the tape winding piece, and the upper portion of the wire guide piece is bent toward the tape winding piece side. A grommet for a wire harness is provided.

The wire group of the wire harness that passes through the grommet is not bundled and protected by winding an adhesive tape or passing a resin tube, and the wire group is inserted in a disjointed state.
Moreover, the tape winding piece wound around the electric wire group of the wire harness is provided on the side opposite to the external interference material when the external interference material is located. Therefore, the wire guide piece provided at a position facing the tape winding piece is provided at a position where the external interference material is present, and is provided so as to cover the wire group from the external interference material.
The width of the tape winding piece is adjusted in accordance with the diameter of the wire harness insertion hole, but the range is 1/8 to 1/4 of the circumference of the wire harness insertion hole. 20 mm to 40 mm.

As described above, the grommet of the present invention has an electric wire guide piece protruding from a position where the electric wire group of the wire harness and one tape winding piece wound with the adhesive tape are opposed to each other, and is opposed to the tape winding piece by the electric wire guide piece. It is corrected so that the electric wire which is scattered on the side approaches the tape winding piece side.
In addition, although the electric wire guide piece is curved to the tape winding piece side, the electric wire group is not easily pulled out from the opening of the insertion hole only by bending the opening of the insertion hole during that time.

  In this way, the variation of the wire group can be suppressed by the wire guide piece, and the wire group is covered with the wire guide piece from the outside on the opposite side of the tape winding piece. Interference with the interference material can be prevented. Furthermore, since the electric wire group of a wire harness only winds with one tape winding piece and an adhesive tape, this adhering part does not become so hard and the flexibility which can be bent and wired can be ensured.

  A rib is provided in the lower center of the wire guide piece, and the thickness of the root portion of the wire guide piece is maximized and gradually decreased toward the outer periphery, and the rib is formed on the entire periphery of the outer periphery. It is preferable to provide it.

As described above, when a rib is projected from the lower center of the wire guide piece, the tip of the rib can be used as a bending point of the wire guide piece. Due to the presence of the bending point, the wire guide piece can be prevented from being deformed so as to be bent from the base.
Furthermore, as described above, by maximizing the thickness of the base portion of the wire guide piece, the wire guide piece can be erected and held on the periphery of the opening by synergistic action with the rib, and deformation of the wire guide piece can be suppressed. . And by making it thin toward an outer periphery, since an electric wire can be guide | induced to a tape winding piece side reasonably and the rib is provided in the outer periphery, it can prevent that a crack arises from an outer periphery.

  The grommet of the present invention is attached to a wire harness that is routed between a back door and a vehicle body of an automobile, and has a large-diameter cylindrical portion that is locked to a through-hole of the back door at one end in the length direction, A large-diameter cylindrical portion that engages with a through-hole of the vehicle body at the other end, and a bellows cylindrical portion that connects the large-diameter cylindrical portions at both ends, and the peripheral edge of the tip opening of the large-diameter cylindrical portion on the back door side It is preferable to provide the tape winding piece and the wire guide piece.

The grommet of the present invention described above is an electric wire in which an electric wire group of a wire harness drawn from the grommet is wound around one tape winding piece projecting from the grommet with an adhesive tape and bent in the opposite direction from the tape winding piece. Is surrounded by an electric wire guide piece and guided to a tape winding piece, so that variations in the electric wire group can be suppressed.
And when an external interference material is located in the opposite side to a tape winding piece, since an electric wire is covered with an electric wire guide piece, interference with an external interference material can be prevented and an electric wire group can be protected.
Furthermore, since the electric wire group is only wrapped around the tape wound piece with the adhesive tape, compared with the case where the electric wire group is sandwiched between the two tape wound pieces and wound with the adhesive tape, the hardness of the fixing portion is reduced. It can be kept flexible, and the wire harness pulled out from the grommet can be easily bent and routed in an arbitrary direction.

It is the schematic which shows the wiring position of the wire harness which attaches the grommet of embodiment of this invention. (A) is a perspective view of the said grommet, (B) is sectional drawing. (A) is the principal part expansion perspective view of the said grommet, (B) is a top view, (C) is sectional drawing, (D) is an expanded sectional view of an electric wire guide piece. It is a perspective view which shows the state wound around the tape winding piece through the grommet through the wire harness. (A) (B) is drawing which shows a prior art example. It is drawing which shows the conventional problem. It is drawing which shows another prior art example.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the grommet 1 according to the embodiment is externally mounted on a wire harness W / H that is bridged and routed between a back door BD and a vehicle body B of an automobile.

  The grommet 1 is integrally formed of rubber or elastomer (EPDM in this embodiment), and as shown in FIG. 2, cylindrical portions 3 and 4 bent in opposite directions are continuous at both ends of the bellows cylindrical portion 2, and the cylindrical portion Large diameter cylindrical portions 5 and 6 for locking the vehicle body are provided at the tips of 3 and 4, and the continuous hollow portion is used as the insertion hole 7 of the wire harness. The one large-diameter cylindrical portion 5 is provided with an annular vehicle body locking groove 5c on the outer peripheral surface, a resin inner 8 is assembled to the other large-diameter cylindrical portion 6, and the outer peripheral surface of the resin inner 8 is used for locking the vehicle body. The locking claw 8a is projected.

  The grommet 1 has a wire harness W / H wired to the back door inserted through the grommet 1 and spanned to the vehicle body side. Instead, the insertion hole 7 is penetrated in a disjointed state.

  The vehicle body locking groove 5c of the large diameter cylindrical portion 5 of the grommet 1 is locked to a through hole H1 provided in the panel P1 of the upper frame of the back door, and the large diameter cylindrical portion is formed at the periphery of the through hole H2 provided in the vehicle body panel P2. The locking claw provided on the resin inner 8 is locked and attached.

  The wire harness W / H drawn from the large-diameter cylindrical portion 5 of the grommet 1 is routed in the panel P1 of the upper frame of the back door BD, and the external interference material M is present at the place where the wire harness is drawn from the grommet 1. . Therefore, the tape winding piece 10 protrudes in the opposite direction side to the external interference member M as shown in FIG. 3C at the peripheral edge portion of the distal end opening 7a on the large diameter cylindrical portion 5 side of the insertion hole 7 of the grommet 1. Has been established. The electric wire group W of the wire harness drawn out from the tip opening 7a is gathered to the tape winding piece 10 side, wound with the adhesive tape T, and converged.

The large-diameter cylindrical portion 5 is an elliptical cylinder, and a peripheral wall 5b inclined from the elliptical end surface wall 5a protrudes, and an annular vehicle body locking groove 5c is provided between the end surface wall 5a and the peripheral wall 5b. Yes.
There is an opening 7a of the insertion hole 7 in the end face wall 5a, and the opening 7a is also an elliptical hole.
The tape wound piece 10 protrudes along one side of one long side of the opening 7a of the elliptical hole. The tape winding piece 10 is a rectangular tongue piece that is long in the protruding direction, and the width w1 of the tape winding piece is about 1/5 of the circumferential length of the opening 7a.

  An electric wire guide piece 12 protrudes from the periphery of the opening 7a facing the tape winding piece 10 in the diagonal direction. When the grommet 1 is attached to the back door, the external interference material M is positioned in the vicinity of the protruding position of the wire guide piece 12. That is, the wire guide piece 12 also has a function of preventing the wire group W of the wire harness from interfering with the external interference material M.

  The wire guide piece 12 is an arc piece surrounding the opening 7 a, and its protruding height h 1 is lower than the height h 2 of the tape winding piece 10 and the width w 2 is wider than the width w 1 of the tape winding piece 10. The height of the wire guide piece 12 is set in consideration of the distance from the external interference material M. The electric wire guide piece 12 is curved upward so as to surround the opening 7a in the left-right width direction.

  Further, a rectangular rib 12a is provided at the center of the lower part of the outer surface of the wire guide piece 12 so as to project to an intermediate position (1/2 × h1) in the height direction. From the rib 12a, the upper side and both sides in the width direction are curved toward the opening 7a. However, it is not curved so as to close the opening 7a. Further, the wire guide piece 12 has the maximum thickness t of the lower base portion 12b, the thickness is gradually reduced toward the outer peripheral edge, and ribs 12c are provided on the entire outer periphery of the electric wire guide piece 12. Yes.

  As described above, the wire guide piece 12 is provided with the rib 12a at the bottom center on the base side and the thickness of the base portion 12b is maximized, so that the wire guide piece 12 is connected to the inner surface of the end wall 5a at the periphery of the opening 7a. From standing up. In addition, by providing the rib 12a, when the wire guide piece 12 is bent by an external pressure, the upper portion of the wire guide piece 12 is bent with the rib 12a as a rotation fulcrum, and the wire guide piece 12 is deformed from the base side. I try not to.

  Since the tape winding piece 10 and the wire guide piece 12 of the outlet of the wire group of the grommet 1 are provided to face each other as described above, the tape is formed by a winding rod or the like in the wire group W drawn from the opening 7a of the grommet 1. An electric wire that is bent apart in a direction away from the winding piece 10 can be guided to the tape winding piece 10 side by the electric wire guide piece 12, and variations in the electric wire group can be suppressed. And when there exists the external interference material M, an electric wire guide piece 12 covers an electric wire, and it can prevent that an electric wire interferes with the external interference material M.

  In addition, since the wire guide piece 12 is brought into contact with a relatively rigid wire, the wire guide piece 12 is easily deformed by being pushed by the wire, but the base portion 12b of the wire guide piece 12 is thickened and the rib 12a Therefore, the electric wire guide piece 12 can be erected and held so as not to be deformed. Furthermore, since the electric wire group of the wire harness is merely wound around the tape wound piece 10 with the adhesive tape, the wire harness can be held flexibly and can be bent and routed in any direction and rapidly. It has various advantages.

  The present invention is not limited to the above-described embodiment, and is not limited to a grommet attached to a wire harness that is routed between the back door and the vehicle body, and is a grommet for a wire harness that is routed between the side door and the vehicle body. It can also be applied.

DESCRIPTION OF SYMBOLS 1 Grommet 5,6 Large diameter cylinder part 7 Insertion hole 7a Opening 10 Tape winding piece 12 Electric wire guide piece 12a Rib 12b Root part 12c Rib W Electric wire group
T Adhesive tape M External interference material

Claims (3)

A grommet made of rubber or elastomer that is attached to the outer peripheral surface of the wire harness and is attached to a through hole formed in the vehicle body panel,
One tape winding piece for fixing the wire harness is protruded from a part of the opening edge periphery of the insertion hole of the wire harness, and the electric wire drawn out from the insertion hole on the side opposite to the tape winding piece is directed to the tape winding piece side. And project the wire guide piece to guide
The wire guide piece protrudes in an arc shape, the protruding height is lower than the tape winding piece and the width is wider than the tape winding piece, and the upper portion of the wire guide piece is bent toward the tape winding piece side. Grommet for wire harness, characterized by   The wire guide piece has a rib projecting at the center of the lower portion thereof, the thickness of the root portion is maximized, the thickness is gradually reduced toward the outer peripheral edge, and the rib is provided on the entire circumference of the outer peripheral edge. A grommet for a wire harness according to 1.   It is attached to a wire harness that is routed between the back door and the vehicle body of an automobile, and has a large-diameter cylindrical portion that engages with a through-hole of the back door at one end in the length direction, and a vehicle body that penetrates at the other end in the length direction. A large-diameter cylindrical portion that is locked in the hole, and a bellows cylindrical portion that connects the large-diameter cylindrical portions at both ends; The grommet for a wire harness according to claim 1 or 2, wherein a guide piece is provided.

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