JPH0946862A - Grommet spacer and moisture-proof structure of grommet using the spacer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To position and hold a spacer which separates a group of wires of which a wiring harness is composed from each other at a required position. SOLUTION: A spacer 17 is provided in the wire insertion part of a grommet so as to be positioned in a direction perpendicular to the direction of the insertion of wires (w). Recesses 17a to which the wires (w) are fitted are formed in the outer circumference of the spacer 17. Further, a flexible band 17b which is extended from the part of the outer circumference of the spacer 17 in the circumferential direction and is wound one-turn around the outer circumference so as to close the openings of the recesses 17a and locking parts 17c and 17e by which the tip of the band 17b is locked on the outer circumference of the spacer 17 at the position near the base of the band 17b are provided. Overflowing wires may be put into some of the wire fitting recesses 17a and the overflowing wires are compressed by winding the band 17b over them and tightened by the band 17b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spacer attached to the inside of a grommet which is mounted in a state where a wire harness is inserted through a through hole of a vehicle body panel of a vehicle and a waterproof structure using the spacer. A two-component curable sealant is filled in to ensure waterproofness, and the spacer allows the wire group forming the wire harness to be diffused to reliably fill the gap between the wires with the sealant. .

[0002]

2. Description of the Related Art In a wire harness for a vehicle, when a wire harness is wired by penetrating through a through hole of a vehicle body panel or the like, a cylindrical shape of a vehicle body mounting portion having an enlarged diameter and a diameter reduction side of the vehicle body mounting portion are continuous. The wire harness is inserted through the rubber grommet having the electric wire insertion part, and the grommet is attached to the through hole in this state, and the electric wire insertion part is brought into close contact with the wire harness for waterproofing.

However, in the grommet, which is attached to a place where water is likely to be generated, water is generated from the gap between the wire insertion portion and the wire of the wire harness and the gap between the wire groups. Therefore, after inserting the wire harness into the grommet. The grommet is filled with a two-component curable sealant to enhance the waterproof function.

When the above-mentioned sealing agent is filled, the sealing agent is viscous so that it is difficult to fill the gaps between the electric wire groups. Particularly, since the electric wire insertion portion is in close contact with the wire harness, the electric wire group is in a compressed state. Then, there is a problem that it is difficult to fill the sealing agent injected from the expanded diameter portion side to the tip side of the wire insertion portion.

In order to solve this problem, Japanese Patent Laid-Open Publication No. Hei 6 (1994) has heretofore been known.
In No. 2233661, the grommet 1 shown in FIGS. 5 (A) and 5 (B) is provided. In the grommet 1, the wire harness W / H is inserted into the grommet 1 while the wires w of the wire harness W / H are passed through the wire diameter expanding spacer 2, and the spacer 2 is inserted into the wire insertion portion 1c of the grommet 1. The sealing agent 5 is filled in the state of being arranged in the orthogonal direction.

The spacer 2 has a shape in which a pair of comb tooth-shaped insertion plates 2a and 2b arranged in a direction orthogonal to the insertion direction of the electric wire w are connected at one peripheral edge side by a connecting plate 2c in the electric wire insertion direction. The electric wire w is inserted into the gap between the comb teeth 2d of the plates 2a and 2b through the opening on the other peripheral edge side to forcibly diffuse the electric wires to form a gap between the electric wires. The attachment of the spacer 2 to the wire harness W / H is performed when the wire harness is bound as shown in FIG. 6, and the spacer 2 is installed on the assembly drawing board 6 via the jig 7 to set the wire harness W / H. Wiring is performed by inserting a plurality of electric wires w constituting H into the respective comb teeth 2d to bind the wire harness W / H.

However, in order to spread the wire group of the wire harness W / H by using the spacer 2 to form the gap, as described above, the wire harness W / H is assembled on the assembly drawing board 6 from the time of binding. To the spacer 2 via the jig 7.
And a pair of comb-teeth-shaped insertion plates 2 of the spacer 2
Since the electric wire w has to be passed through the gap between the comb teeth 2d of a and 2b, there is a drawback that it takes a lot of work.

Further, in the spacer 2, when the amount of electric wires constituting the wire harness W / H is small, as shown in FIG. 7, the electric wire w is deviated to the connecting plate 2c side and the electric wire w is not present on the opening side. Becomes That is, the electric wire w is offset to one side of the spacer 2. In this state, when the wire harness W / H with the spacer 2 attached is inserted into the grommet 1 and filled with the sealant, the sealant does not easily flow to the side where the electric wire w is crowded, and the sealant is applied to the portion where the electric wire w does not exist. Flow easily and the sealant cannot be filled between the wires.
Moreover, the sealant flowing in the portion where the electric wire w does not exist is
In the portion Z where the distance from the opening side on both sides to the connecting plate 2c is short, since the portion R where the electric wire w does not exist is small, the sealant easily penetrates between the electric wires, but from the opening side of the central portion to the connecting plate 2c. In the portion Y where the distance is long, there are many portions R where the electric wire w does not exist, the sealant hardly penetrates between the electric wires, and the sealant cannot be uniformly filled between the electric wires.

For this reason, as shown in FIGS. 8 and 9, a vehicle body mounting portion 10b having a locking groove 10a that engages with a through hole of the vehicle body panel and a reduced diameter end of the vehicle body mounting portion 10b. The rubber grommet 10 having a cylindrical wire insertion portion 10c continuous with the wire insertion portion 10c is provided with a large-diameter spacer attachment portion 10e on the coupling side with the vehicle body mounting portion 10b. Insertion direction X of the plurality of electric wires w constituting the wire harness W / H in the mounting portion 10e
There is provided a structure in which a separate spacer 12 is arranged in a direction orthogonal to and a two-component curable sealant 15 is filled in that state.

The spacer 12 is shown in FIG.
As shown in (B), the spacer 12 has a substantially disk shape.
Radial wire insertion recess 1 with a constant angle on the entire outer circumference
, 12a are formed. The spacer 12
Distributes the electric wires w into the respective electric wire insertion concave portions 12a, expands the diameter of the electric wire group by the spacers 12 to provide a gap between the electric wires, and as shown in FIG. 8, tape windings 14A and 14B on both sides. The wire harness W / H in which the gap between the electric wires is gradually narrowed toward the side is inserted into the electric wire insertion portion 10c of the grommet 10, and the sealing agent 15 is formed between the electric wire and the electric wire insertion portion 10c from the gap. Filling in between.

According to the above conventional technique, the wire harness W
Irrespective of the amount of electric wire forming / H, the electric wire w can be evenly diffused in the circumferential direction from the center without being biased, and the sealing agent 15 is surely filled between the electric wires to improve the waterproof performance. be able to.

[0012]

However, since the spacer 12 is only held in the orthogonal direction by the elasticity of the electric wire w of the wire harness W / H, the spacer 12 of the wire harness W / H is inserted. There is a possibility that the wire may move in the insertion direction X and be displaced, and in particular, if the wire insertion portion 10c is displaced, there is a problem that the wire insertion portion 10c is not sufficiently filled with the sealant 15. Further, if the elasticity of the electric wire w is weak, the spacer 12 may fall in the insertion direction X,
If the spacer 12 falls down, the wire group cannot be diffused, so that there is a problem that the sealant 15 cannot be uniformly filled between the wires.

The present invention has been made in order to solve the above problems, and prevents unnecessary movement and collapse of spacers for diffusing the electric wire group forming the wire harness, thus ensuring a sealant in the gap between the electric wires. It is intended to provide a waterproof structure of a grommet that can be filled in.

[0014]

In order to achieve the above object, the present invention provides a wire harness comprising a plurality of electric wires, which is inserted into a grommet having a cylindrical electric wire insertion portion according to claim 1. A flat plate to be used in a grommet that fills the insertion portion with a sealant and seals the gap between the electric wires and between the electric wire and the inner peripheral surface of the electric wire insertion portion, the flat plate being arranged in the electric wire insertion portion in a direction orthogonal to the insertion direction of the electric wire. A plurality of electric wire insertion recesses are provided along the outer peripheral edge of the spacer, and are extended from a part of the outer circumference of the spacer in the circumferential direction, and are wrapped around the outer circumference so as to close the inlet of each electric wire insertion recess. A band part and a lock part that locks the tip of the band part that makes one round along the outer peripheral edge, and winds the band part so as to hold down the electric wire that is distributed and inserted into the electric wire insertion recess. The tip to lock to the locking portion, providing a grommet spacer, characterized in that it is clamped with respect to the wire.

As the lock part, a lock claw part is provided at the tip of the band part of the spacer, and a lock projection for locking the lock claw part is provided on the inner edge of one electric wire insertion concave part on the side opposite to the band projecting side. Parts are provided. Alternatively,
As the lock portion, a sawtooth portion is provided on the band portion of the spacer, and a band lock portion is provided on the outer periphery of the spacer on the side opposite to the band protruding side, and the tip of the band portion is inserted into the insertion hole of the band lock portion. The serrated portion of the band portion is locked by locking claws in the insertion hole.

According to a second aspect of the present invention, a grommet having a tubular electric wire insertion portion is inserted with a wire harness made of a plurality of electric wires, and the electric wire insertion portion is filled with a sealant so that the gap between electric wires and As a waterproof structure that seals the gap between the electric wire and the inner peripheral surface of the electric wire insertion portion, the spacer according to claim 1 is arranged in the electric wire insertion portion in a direction orthogonal to the insertion direction of the electric wire, and in the electric wire insertion concave portion of the spacer. The electric wires are distributed and inserted, and the electric wires are inserted into a part of the electric wire insertion recesses to the extent that they overflow from the electric wire insertion recesses, the inlets of the electric wire insertion recesses are closed, and the overflowing electric wire is pressed down. And the tip of the band part is locked to the lock part so that the wire group is expanded in diameter by the spacer to provide a gap between the wires and both sides of the spacer in the longitudinal direction. Wrap the wire group with tape and gradually reduce the gap between the wires toward the winding side.In a state where the wire harness is inserted into the wire insertion part of the grommet, insert the sealant into the gap between the wires and between the wires. Provided is a grommet waterproof structure using a spacer characterized by being filled between the parts.

As described above, in the present invention, the electric wires are distributed and inserted into the electric wire insertion concave portions of the spacer, and the electric wires are inserted to some electric wire insertion concave portions to the extent that they overflow, and then the inlets of the electric wire insertion concave portions are inserted. The band part is wound so as to straddle the outer circumference of the overflowing electric wire, and the tip of the band part is locked to the lock part to attach the spacer to the wire harness. This expands the diameter of the wire group in the radial direction to form a space where the wire cannot be inserted in the center of the wire group, and the wire group is diffused in the circumferential direction in each wire insertion recess, forcing the wire between the wires. A gap is formed. In this state, insert the wire harness together with the spacer into the grommet. At this time, since the band portion of the spacer straddles the outer circumference of the electric wire that has overflowed from the electric wire insertion concave portion and is tightened to the outer circumference of the spacer, tension is applied to the band portion and presses the outer circumference of the electric wire that has overflowed. The spacer is held by this pressing force, and the spacer does not move in the insertion direction, so that the displacement does not occur. Further, since the band portion is also wrapped around the outer circumference of the overflowed electric wire, the spacer does not fall in the insertion direction.

When the spacer is attached to the wire harness as described above, the spacer is inserted through the grommet, and the spacer is arranged at a predetermined position of the wire insertion portion in the orthogonal direction, the seal agent is passed through the space and the gap. Is smoothly filled between the wires. In particular, in the spacer arranging portion, the gap gradually widens toward the spacer side, so that the sealant smoothly permeates between the electric wires. As a result, between the electric wires and between the electric wires and the inner peripheral surface of the electric wire insertion portion are reliably sealed by the cured sealant,
Waterproof performance is enhanced.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail based on the illustrated embodiments. 1, FIG. 2 (A) and FIG.
As shown in FIG. 3, the spacer 17 made of synthetic resin has a flat plate shape, and a plurality of (e.g., 8) elliptical electric wire insertion recesses 17a are radially formed on the entire outer periphery at a constant angle (for example, 45 degrees). ..., 17a are formed.

On the outer periphery of the spacer 17, a flexible band portion 17b extending in the circumferential direction from a part of the spacer 17 with the same width as the spacer 17 is integrally formed. A lock claw portion 17c folded back in a substantially U shape is provided at the tip of the band portion 17b.

The band portion 17b is wound around the outer periphery of the spacer 17 so as to block the entrance of each wire insertion recess 17a from the extension direction, and the lock claw portion 17c is projected from the band portion in the vicinity of the base portion 17d of the band portion 17b. Lock protrusion 1 formed on the inner edge of the electric wire insertion recess 17a on the opposite side
7e is locked and locked. The band portion 17b is wound around the outer periphery of the spacer 17 and is set to have a length that does not loosen when the lock claw portion 17c is locked to the lock protrusion 17e. The lock protrusion 17e
The electric wire w is not inserted into the electric wire insertion recess 17a formed with.

The spacer 17 is attached to the wire harness W / H previously bound on the wire harness assembly drawing board. As shown in FIG. 4 (A), the spacer 17 is attached to the wire harness W / H. The electric wire group at the grommet attachment position is spread out and divided into two, and the spacer 17 is inserted into the internal space formed in the expanded state in a direction orthogonal to the length direction of the electric wire. Wire harness W /
The insertion position of the spacer 17 with respect to H is the grommet 1
When the wire harness W / H is inserted into 0, the spacer 17 is positioned at the spacer mounting portion 10e.

Next, as shown in FIG. 4 (B), when the operator positions the electric wire group substantially evenly on the entire outer periphery of the spacer 17 and grips the electric wire group in this state to press the electric wire w, the spacer The electric wires w are evenly inserted into the respective electric wire insertion concave portions 17 a of 17. At this time, some of the wire insertion recesses 17a, for example, in FIG. 2 (A), the wires w overflow from the respective wire insertion recesses 17a into the three wire insertion recesses 17a on the left side, the diagonally lower left side, and the lower side. Insert to the extent.

Then, a band portion 17b is wound around the outer circumference of the spacer 17 so as to straddle the outer circumference of the overflowing electric wire w so as to close the entrance of each electric wire insertion recess 17a, and the lock claw portion 17c at the tip of the band portion 17b is wound. Wire insertion recess 17
It is locked to the lock protrusion 17e of a. At this time, since the band portion 17b is wound around the outer periphery of the spacer 17 while straddling the outer periphery of the electric wire w overflowing from the electric wire insertion recess 17a, tension is applied to the band portion 17b.

Next, as shown in FIG. 4C, the adhesive tapes 14A and 14B are wound around the electric wire groups located on both sides of the mounting position of the spacer 17, and the spacer 17
Both sides of the wire are bound with the tapes 14A and 14B and the electric wire w is pulled to both sides via the spacer 17 to hold the spacer 17 in a direction orthogonal to the insertion direction of the electric wire w. The one adhesive tape 14A is a grommet 1
The wire is wound around the wire insertion portion 10c at the outer position along the tip of the wire insertion portion 10c in the insertion state of 0. Therefore, grommet 1
When attaching 0, the adhesive tape 14A is used as a mark so that the grommet 10 can be easily positioned at a required position with respect to the wire harness W / H.

In the wire harness W / H to which the spacers 17 are attached, the spacers 17 are provided with the electric wire insertion recesses 17
The electric wire group is diffused in the circumferential direction by a to form a gap between the electric wires w. Further, a space in which the electric wire w is not inserted is formed in the central portion of the electric wire group by the electric wire insertion concave portions 17a. Furthermore, the wire harness W / H is the spacer 1
The above-mentioned gaps gradually become narrower toward the tape winding side on both outer sides than the attachment portion of 7, and the electric wire group is bound in a reduced diameter state.

When the spacer 17 is attached as described above, even if the amount of the electric wire w constituting the wire harness W / H is small, the electric wire w is diffused in the entire circumferential direction by the electric wire insertion recesses 17a and has a diameter. Is also spread in the direction,
There is no deviation to one side in the circumferential direction or deviation to the radial direction, and gaps are formed substantially uniformly in both the circumferential direction and the radial direction.

The wire harness W / H to which the spacer 17 is attached is inserted into the grommet 10. In that case,
First, the wire insertion portion 10c of the grommet 10 is expanded by a grommet expander and the wire harness W / H is inserted. At this time, the wire harness W / H is grommet 10
One of the adhesive tapes 1 from the opening of the tip of the electric wire insertion portion 10c
Position with 4A exposed. Thereby, the spacer 17 is arranged in the spacer attachment portion 10e of the electric wire insertion portion 10c in a direction orthogonal to the insertion direction X of the electric wire w.

The spacer 17 is connected to the wire harness W /
When it is inserted into the grommet 10 together with H, tension is applied to the band portion 17b wound around the outer periphery of the spacer 17 and presses the outer periphery of the overflowing electric wire w, so that it is held by this compression force and does not move in the insertion direction. Therefore, no positional deviation occurs. Further, since the band portion 17b is also wrapped around the outer circumference of the electric wire w that overflows, the spacer 17 does not fall in the insertion direction.

Then, the grommet spreader is used as a grommet 1
0, the vehicle body mounting portion 10b of the grommet 10 is arranged upward, and the two-liquid curable sealant 15 is injected into the wire insertion portion 10c from the opening of the vehicle body mounting portion 10b. As the sealing agent 15, one having low viscosity and good fluidity is used. When the grommet spreader is removed, the outer diameter of the spacer 17 is formed to be larger than the inner diameter of the spacer mounting portion 10e, so that the spacer 17 is mounted in the electric wire insertion portion 10 in a pressure contact state.

In this state, when the sealant 15 is injected as described above, a space in which the electric wire w is not formed is formed in the center of the electric wire group by the electric wire insertion concave portions 17a of the spacer 17 as described above. At the same time, since a gap gradually widening toward the spacer 17 between the electric wire groups is formed, the sealant 15 is filled with good fluidity through the space. The sealing agent 15 is used for the spacer mounting portion 10.
The whole area from e to the outside of the opening of the wire insertion portion 10c is filled.

As described above, the cured sealant 15 reliably seals the space between the wires w and the inner peripheral surface of the wire insertion portion 10c, so that the waterproof property is improved.

In the above embodiment, the lock claw portion 17c at the tip of the band portion 17b of the spacer 17 is attached to the electric wire insertion concave portion 1.
The band portion 17b can be locked with one touch by engaging with the lock projection portion 17e of 7a.

Further, as shown in FIG. 2B, a band lock portion 17f is integrally formed on the outer periphery of the spacer 17 and a serrated portion 17g is formed on the band portion 17b, so that the tip of the band portion 17b is attached to the band. Insertion hole 1 of lock part 17f
7h, and when the serrated portion 17g of the band portion 17b is locked to the locking claw 17i in the insertion hole 17h, the band portion 17b can be locked with one touch and the band portion 1
Since the length of 7b can be adjusted, it is possible to easily cope with an increase or decrease in the amount of electric wires.

[0035]

As is apparent from the above description, when the grommet spacer of the present invention is used, the electric wires are distributed and inserted into the electric wire insertion concave portions of the spacer, and the electric wire insertion concave portions overflow a part. After inserting the wire into the cable, close the entrance of each wire insertion recess and wrap the band part so as to press the outer circumference of the overflowed wire, lock the tip of the band part to the lock part and tighten the spacer to the wire harness. Therefore, tension is applied to the band portion and presses the outer circumference of the overflowed electric wire, so that the electric wire is held by this pressing force and does not move in the insertion direction, and the positional displacement does not occur. Further, since the band portion is also wrapped around the outer circumference of the overflowed electric wire, the spacer does not fall in the insertion direction.

Therefore, in the grommet, the spacer can be securely held in a predetermined position of the wire insertion portion in the orthogonal direction, and if the seal agent is injected in this state, the seal agent will pass through the space and the gap and the space between the wires. As a result, it is possible to surely seal between the electric wires and between the electric wires and the inner peripheral surface of the electric wire insertion portion by the hardened sealant, and it is possible to enhance the waterproof performance.

[Brief description of drawings]

FIG. 1 is a perspective view of a spacer of the present invention.

FIG. 2A is a front view of a spacer that locks a band portion, and FIG. 2B is a cross-sectional view of a modified example of the lock portion.

FIG. 3 is a perspective view of a mounted state of a spacer.

4 (A), (B) and (C) are perspective views showing a work process of attaching a spacer to a wire harness.

5A and 5B are drawings showing a waterproof structure of a conventional grommet.

FIG. 6 is a perspective view showing a state in which a wire harness is formed using a conventional spacer.

FIG. 7 is a view showing a problem of a conventional spacer.

FIG. 8 is a sectional view showing a waterproof structure of a grommet.

9A is a perspective view of a grommet, and FIG. 9B is a sectional view of the grommet.

FIG. 10 (A) is a perspective view of a conventional spacer,
(B) is a front view of the spacer.

[Explanation of symbols]

 W / H Wire harness w Electric wire 10 Grommet 10a Electric wire insertion part 15 Sealant 17 Spacer 17a Electric wire insertion recess 17b Band part 17c Lock claw part 17d Base part 17e Lock protrusion part 17f Band lock part 17g Sawtooth part 17h Insertion hole 17i Locking claw

Claims (2)

[Claims] 1. A grommet having a tubular electric wire insertion portion is inserted with a wire harness made of a plurality of electric wires, and the electric wire insertion portion is filled with a sealant so as to provide a space between the electric wires and between the electric wires and the inner peripheral surface of the electric wire insertion portion. A spacer used for a grommet that seals a gap, which is a flat plate shape arranged in the wire insertion portion in a direction orthogonal to the wire insertion direction, and is provided with a plurality of wire insertion recesses along the outer peripheral edge thereof. A flexible band part that extends in the circumferential direction from a part of the outer periphery of the wire and is wound around the outer periphery so as to close the entrance of each wire insertion recess, and a lock part that locks the tip of the band part that makes a round along the outer peripheral edge. And wrapping the band part so as to hold down the electric wire that is distributed and inserted into the electric wire insertion recess, lock the tip of the band part with the lock part, and tighten the wire against the electric wire. Spacer grommet, characterized in that it is. 2. A grommet having a tubular electric wire insertion portion is inserted with a wire harness composed of a plurality of electric wires, and the electric wire insertion portion is filled with a sealant so that a gap between the electric wires and between the electric wire and the inner peripheral surface of the electric wire insertion portion is formed. A waterproof structure for sealing a gap, wherein the spacer according to claim 1 is arranged in the electric wire insertion portion in a direction orthogonal to an insertion direction of the electric wire, and the electric wire is distributed and inserted into an electric wire insertion concave portion of the spacer, An electric wire is inserted into a part of the electric wire insertion recess so as to overflow from the electric wire insertion recess, and the band portion is wound so as to close the inlet of each electric wire insertion recess and press the overflowed electric wire and the tip of the band portion. Is locked to the lock portion, the diameter of the electric wire group is expanded by the spacer to provide a gap between the electric wires, and the electric wire group is wound on both sides in the length direction of the spacer with a tape and wound. The wire harness in which the gap between the wires is gradually narrowed toward the side is inserted into the wire insertion portion of the grommet, and the sealant is filled through the gap between the wires and between the wires and the wire insertion portion. Grommet waterproof structure using a spacer.