JPH09161579A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grommet which can improve the easiness in mounting on the body panel of a car and can generate certain waterproof seal in the mounted condition. SOLUTION: A grommet concerned includes a minor diametric cylindrical part 10a to admit insertion of a wire harness W/H, a major diametric cylindrical part 10b continued to the front extremity of the minor diametric cylindrical part, and a folded-back part 10c formed by folding back from the front extremity of the major diametric cylindrical part, wherein a detaining recess 10d to be engaged by the inside edge of a through hole 11a formed in a car body panel 11 is provided in the outside surface of the folded-back part. The first detent projection 10e is provided on the inside surface of the folded-back part while the second detent projection 10f is provided on the outside surface of the major cylindrical part confronting in a position rear more than the first projection, and the retaining recess is positioned in the through hole and the major cylindrical part is pressed forward from the minor cylindrical part so that the folded-back part is enlarged in the diameter, and the first projection is engaged by the second projection in the condition that the bottom of the recess is in tight attachment with the inside surface of the through hole, and this condition of pressure contact is locked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet which is attached to a through hole of a vehicle body panel in a state in which a wire harness to be routed inside a vehicle is inserted, and particularly, the workability of attaching to the vehicle body panel is improved. At the same time, it ensures a waterproof seal in the mounted state.

[0002]

2. Description of the Related Art A wire harness for an automobile is shown in FIG.
As shown in (A), a vehicle body panel (for example, a dash panel that separates the engine room A and the vehicle room B) 1 may be pierced through a through hole 1a to be installed inside the vehicle.
In this case, the wire harness W / H is inserted through the small-diameter cylindrical portion 2a of the rubber grommet 2, and in this state, the grommet 2 is passed through the through hole 1 from the engine room A side toward the vehicle compartment B side.
The grommet 2 is attached to the through hole 1a of the vehicle body panel 1 by being inserted into the a and the outer peripheral recessed portion 2c of the large diameter portion 2b being locked to the inner peripheral edge of the through hole 1a.

[0003]

However, when the large-diameter portion 2b of the grommet 2 is inserted into the through hole 1a, the lip portion 2d at the tip is the outer peripheral concave portion 2c at the inner peripheral edge of the through hole 1a.
It may bend and bite inside. In this case, the grommet 2 is not securely attached, and the sealing property is poor, which causes water leakage. Therefore, once the large diameter portion 2
Although b is pushed into the through hole 1a to the rear end and then pulled back to prevent the lip portion 2d from being caught, the work in two directions of pushing and pulling back is required, and there is a problem that the mounting workability is poor.

Further, as shown in FIG. 6 (B), instead of the large diameter portion 2b of the grommet 2, a large diameter member 3 made of synthetic resin is fixed and penetrates the outer peripheral concave portion 3a of the large diameter member 3. Hole 1a
What is provided is to be locked to the inner peripheral edge of the. (See Japanese Patent Application Laid-Open No. 2-66816) However, the above configuration has a problem that the cost is high because the grommet 2 and the large diameter member 3 have a two-piece structure.

The present invention has been made in order to solve the above-mentioned problems, and improves the workability of mounting on a vehicle body panel of an automobile, and can realize a reliable waterproof seal in the mounted state, and an inexpensive grommet. Is intended to provide.

[0006]

In order to achieve the above object, the present invention provides a small-diameter cylindrical portion through which a wire harness is inserted, and a large-diameter cylindrical portion which is continuous with a front end of the small-diameter cylindrical portion.
The large-diameter tubular portion has a folded-back portion that is folded back from the front end, and the outer peripheral surface of the folded-back portion is provided with a locking concave portion that is locked to the inner peripheral edge of the through hole of the vehicle body panel. While providing the first locking convex portion on the inner peripheral surface, the second locking positioned rearward of the first locking convex portion on the outer peripheral surface of the large-diameter cylindrical portion facing the inner peripheral surface of the folded portion. A convex portion is provided, the locking concave portion is located in the through hole of the vehicle body panel, the large diameter tubular portion is pressed forward from the small diameter tubular portion side to expand the diameter of the folded portion at the front end, and the bottom portion of the locking concave portion is formed. Is closely attached to the inner peripheral surface of the through hole of the vehicle body panel, the second locking projection is located in front of the first locking projection and is locked to the first locking projection. (EN) Provided is a grommet configured to lock a state in which a bottom portion of a locking recess is in pressure contact with an inner peripheral surface of a through hole of a vehicle body panel.

It is preferable that the folded-back portion which is continuous with the large-diameter cylindrical portion is formed to have a thin wall that is curved outward and easily bends. (Claim 2)

In the grommet of the present invention, the tip end surface of the folded portion is supported by the hand of a worker or a jig, and the folded portion is held so as not to be pulled at the same time. By pulling the portion rearward, the folded portion is bent to reduce its diameter, and in that state, the folded portion is inserted into the vehicle body panel from the front end of the folded portion. At this time, the outer diameter of the bottom of the locking recess formed in the folded-back portion is smaller than the inner diameter of the through hole of the vehicle body panel due to the reduced diameter of the folded-back portion. Can be inserted into.

When the locking recess is fitted to the inner peripheral edge of the through hole, the large-diameter tubular portion is pressed forward from the small-diameter tubular portion side (the same direction as the grommet insertion direction). As a result, the large-diameter tubular portion moves forward, the folded-back portion expands with the movement of the large-diameter tubular portion, and the outer diameter of the bottom of the locking recess increases, and the through hole of the vehicle body panel is expanded. When it comes into close contact with the inner peripheral surface of the
The first locking protrusion and the second locking protrusion are located forward of the locking protrusion.
The locking projection is locked, and the mounting work is completed. In this state, the folded part of the grommet is locked in the expanded state,
Can be securely attached to the vehicle body panel.

As described above, in the grommet of the present invention, the fold portion is expanded and the bottom of the locking recess is penetrated through the through hole of the vehicle body panel when it is attached to the through hole of the vehicle body panel with one touch by only inserting in one direction. It can be elastically pressed against the inner peripheral surface of, and a reliable waterproof seal can be achieved. Further, since the folded portion is prevented from being restored and the diameter thereof is reduced by the engagement of the first locking convex portion and the second locking convex portion, the above-mentioned attached state can be reliably held.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail based on the embodiments shown in the drawings. 1 and 2 (A)
As shown in (B), the grommet 10 of the present invention includes a small-diameter cylindrical portion 10a through which the wire harness W / H is inserted, a large-diameter cylindrical portion 10b continuous to the front end of the small-diameter cylindrical portion 10a, and the large-diameter cylinder. A folded-back portion 10c that is folded back from the front end of the portion 10b.
And are integrally formed of an elastic material such as rubber or elastomer.

The grommet 10 has a locking recess on the outer peripheral surface of the folded-back portion 10c for locking the inner peripheral edge of the through hole 11a of the vehicle body panel 11 such as a dash panel for partitioning the engine compartment A and the passenger compartment B of the automobile. 10d is provided. Also,
The large-diameter cylindrical portion 1 facing the inner peripheral surface of the folded portion 10c is provided with the first locking protrusion 10e on the inner peripheral surface of the folded portion 10c.
The outer peripheral surface of 0b is provided with a second locking protrusion 10f located rearward of the first locking protrusion 10e. The outer diameter d1 of the bottom of the locking recess 10d is formed to be the same as or slightly larger than the inner diameter d2 of the through hole 11a of the vehicle body panel 11.

The small-diameter cylindrical portion 10a has a wire harness W.
/ H is a cylindrical shape having an inner diameter that closely adheres to the outer periphery of the wire harness W / H
When the tape 12 is wound after inserting H inside and the wire harness W / H and the grommet 10 are fixed,
The grommet 10 is prevented from coming off.

The folded-back portion 10c is formed by folding the front end of the large-diameter cylindrical portion 10b rearward toward the small-diameter cylindrical portion 10a in a substantially U-shape so as to surround the outer circumferences of the large-diameter cylindrical portion 10b and the small-diameter cylindrical portion 10a. I have to. Further, the folded-back portion 10c is formed such that a portion continuous with the large-diameter cylindrical portion 10b is thinly curved so as to be bent outward and easily bent, so that the diameter-reduced and expanded diameters can be easily deformed in the radial direction. . Specifically, when the large-diameter cylindrical portion 10b is pulled rearward from the small-diameter cylindrical portion 10a side, the outer diameter d1 of the bottom of the locking recess 10d is reduced, while when it is pressed forward, the outer diameter of the locking recess 10d is reduced. The diameter of d1 is expanded.

The first locking protrusion 10e has a flat surface 10g on the front side and a rear surface side as an inclined surface 10h inclined inward from the rear end toward the front end.
It is annularly projected from the inner peripheral surface of c. The second locking convex portion 10f is provided rearward of the first locking convex portion 10e, and the front surface side is an inclined surface 10i inclined outward from the front end toward the rear end and the rear surface. Flat side 1
0j is provided so as to project annularly from the outer peripheral surface of the large-diameter cylindrical portion 10b.

The first locking projection 10e and the second locking projection 1
0f means that the folded portion 10c is continuous with the front end of the large diameter tubular portion 10b by pressing the small diameter tubular portion 10a forward.
Is bent and the diameter is increased, and the flat surface 10g and the flat surface 10j are set to lock with each other in a state where the bottom of the locking recess 10d is in close contact with the inner peripheral surface of the through hole 11a of the vehicle body panel 11. ing. As a result, the bottom of the locking recess 10d of the grommet 10 having elasticity is pressed against and attached to the inner peripheral surface of the through hole 11a of the vehicle body panel 11, and the folded-back portion 10c is prevented from being restored to reduce the diameter. ing. On the other hand, when the small-diameter cylindrical portion 10a is pulled backward, the first
The locking convex portion 10e and the second locking convex portion 10f move in a direction away from each other, and the folded-back portion 10c continuous with the large-diameter cylindrical portion 10b is bent rearward to reduce the diameter, and the outer diameter of the locking concave portion 10d. d1
Is smaller than the inner diameter d2 of the through hole 11a of the vehicle body panel 11 (d1 <d2).

At the bottom of the locking recess 10d, a rib 10k is provided in an annular shape so as to press the inner peripheral surface of the through hole 11a of the vehicle body panel 11 to seal the rib. Also, the locking recess 1
At the end of the engine room A side of 0d, the vehicle body panel 11
Is provided with a large-diameter first lip portion 10m that abuts and seals against the surface 11b on the engine room A side, and the end on the vehicle compartment B side contacts the surface 11c on the vehicle compartment B side of the vehicle body panel 11. A small-diameter second lip portion 10n for sealing is provided.

On the other hand, in the vehicle body panel 11 to which the grommet 10 is attached, the through hole 11a for attaching the grommet having an inner diameter of d2 is formed at the penetrating position of the wire harness W / H. A cylindrical burring 11d protruding from the surface 11b on the engine room A (insertion) side is formed on the peripheral edge of 11a.

When the grommet 10 having the above construction is attached to the through hole 11a of the vehicle body panel 11 with the grommet 10 attached to the wire harness W / H, the large-diameter tubular portion 10b should be pulled rearward from the small-diameter tubular portion 10a side of the grommet 10. . As a result, the locking recess 10d formed in the folded-back portion 10c.
Is reduced to be smaller than the inner diameter of the through hole 11a of the vehicle body panel 11.

In this work, as shown by a dotted line in FIG. 3, the operator presses the tip surface 10r of the folded portion 10c with one hand H1 and the rear end of the small diameter cylindrical portion 10a wound with the tape 12 on the other side. As shown in FIG. 4, it is possible to easily bend the folded portion 10c in the direction of reducing the diameter by pulling the folded-back portion 10c backward, only by pulling it backward (see the arrow X) with the hand H2.

The operation of pressing the tip end surface 10r of the folded-back portion 10c may be performed by using the jig 15 shown in FIG. The jig 15 is provided with a concave groove 15a which is partially cut out from the outer peripheral edge toward the center, and the concave groove 15a is formed in the grommet 1.
The outer peripheral surface of the large-diameter cylindrical portion 10b of 0 is fitted from the outside in the radial direction, and the jig 15 presses the tip end surface 10r of the folded-back portion 10c, so that the pulling operation of the small-diameter cylindrical portion 10a to the rear can be easily performed. You can

As described above, the small-diameter cylindrical portion 10a is kept pulled backward, and in this state, as shown by the arrow Y, from the front end of the folded portion 10c to the through hole 1 of the vehicle body panel 11.
Insert into 1a. As shown in FIG. 4, since the outer diameter d1 of the bottom of the locking recess 10d of the folded portion 10c is smaller than the inner diameter d2 of the through hole 11a of the vehicle body panel 11 (d1 <d2), the folded portion 10c is formed in the through hole 11a. The locking recess 10d can be smoothly inserted.

When the locking recess 10d is fitted to the inner peripheral edge of the through hole 11a, the pulling of the small diameter cylindrical portion 10a is stopped,
The large-diameter cylindrical portion 10b is pressed forward from the small-diameter cylindrical portion 10a side (the same Y direction as the grommet insertion direction). As a result, the large-diameter cylindrical portion 10b moves forward, and the large-diameter cylindrical portion 10b moves.
The diameter of the folded-back portion 10c increases with the movement of.

Due to the forward movement of the large-diameter cylindrical portion 10b, the inclined surfaces 10h and 10i of the first locking convex portion 10e and the second locking convex portion 10f respectively come into contact with each other, and while sliding relative to each other, the second engaging portion is engaged. The stop protrusion 10f moves forward. Due to this movement, the outer diameter d1 of the bottom of the locking recess 10d of the folded-back portion 10c is increased, and the inner peripheral surface of the through hole 11a of the vehicle body panel 11 is pressed. In this state, the second locking projection 10f rides over the first locking projection 10e, the flat surfaces 10g and 10j are locked, and the mounting operation is completed.

As described above, in the grommet 10 of the present invention, the large-diameter cylindrical portion is inserted in the insertion direction from the tip of the folded portion with respect to the vehicle body panel, with the locking recess fitted in the through hole. It can be attached simply by pressing in the same direction. That is, since the grommet can be attached to the vehicle body panel 11 by only inserting the grommet in one direction, unlike the conventional grommet 2 shown in FIG. 6 (A), it is not a two-way reciprocating work of pushing and pulling back. Installation workability can be improved.

Further, in the mounted state, as shown in FIG. 1, since the diameter of the folded portion 10c is expanded and the bottom of the locking recess 10d is pressed against the inner peripheral surface of the through hole 11a, a reliable waterproof seal is provided. Can be planned. Further, in the present embodiment,
A rib 10k that presses against the inner peripheral surface of the through hole 11a to seal it.
Is provided at the bottom of the locking recess 10d, the sealability can be further improved. Furthermore, since this mounting state can prevent the folded-back portion 10c from being restored and the diameter thereof being reduced due to the locking of the first locking convex portion 10e and the second locking convex portion 10f, it must be securely held. You can

[0027]

As is apparent from the above description, in the grommet of the present invention, by pressing the large-diameter cylindrical portion from the small-diameter cylindrical portion side, the diameter of the folded portion continuous with the front end of the large-diameter cylindrical portion is increased. Since the bottom of the locking recess formed in the folded-back portion can be attached to the inner peripheral surface of the through hole of the vehicle body panel under pressure, the sealing performance between the grommet and the vehicle body panel can be improved. Further, since the folded portion is prevented from being restored and the diameter thereof is reduced by the engagement of the first locking convex portion and the second locking convex portion, it is possible to reliably hold the above-mentioned attached state.

Further, in the above-mentioned grommet, in the state where it is inserted into the vehicle body panel and the locking recess is fitted in the through hole,
It can be attached by pressing the large diameter cylinder part in the same direction as the insertion direction, it can be attached to the vehicle body panel by inserting work in only one direction, like the conventional grommet, it can be pushed in and pulled back in two directions. Since it is not a reciprocating work, the workability of mounting can be improved. Further, since the grommet has a one-piece structure rather than the conventional two-piece structure, it can be implemented at low cost.

Further, in the grommet of the present invention, since the connecting portion of the folded portion with the large-diameter cylindrical portion is formed in a thin wall that is easy to bend, the reduced diameter and expanded diameter of the folded portion can be easily deformed in the radial direction. Can be caused to. Moreover, when inserting the grommet into the through hole of the vehicle body panel, the tip of the folded-back portion is held down with one hand or a jig, and the small-diameter tubular portion is pulled with the other hand, so that the bottom of the locking recess is The outer diameter of the is smaller than the inner diameter of the through hole, and by inserting the grommet into the through hole in this state, it can be smoothly inserted,
Further, the mounting workability can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state in which a grommet of the present invention is attached to a vehicle body panel.

FIG. 2 shows the grommet of FIG. 1, (A) is a perspective view,
(B) is a sectional view.

FIG. 3 is a sectional view showing a state in which a grommet is attached to a wire harness.

FIG. 4 is a cross-sectional view showing a state in which the folded portion is reduced in diameter by pulling the grommet of FIG.

FIG. 5 is a perspective view showing a jig for pulling the grommet.

6A and 6B are cross-sectional views of a conventional grommet, respectively.

[Explanation of symbols]

 10 Grommet 10a Small-diameter cylindrical part 10b Large-diameter cylindrical part 10c Folding part 10d Locking concave part 10e First locking convex part 10f Second locking convex part 11 Body panel 11a Through hole W / H wire harness

Claims (2)

[Claims] 1. A small-diameter tubular portion for inserting a wire harness,
It has a large-diameter cylindrical portion continuous to the front end of the small-diameter cylindrical portion and a folded-back portion that is folded back from the front end of the large-diameter cylindrical portion, and an outer peripheral surface of the folded-back portion has an inner peripheral edge of a through hole of a vehicle body panel. And a first locking protrusion on the inner peripheral surface of the folded-back portion, and the first outer peripheral surface of the large-diameter cylindrical portion facing the inner peripheral surface of the folded-back portion on the inner peripheral surface of the folded-back portion. 1. Provide a second locking projection located rearward of the locking projection, and position the locking recess in the through hole of the vehicle body panel to press the large-diameter tubular portion forward from the small-diameter tubular portion side. With the folded-back portion of the front end being enlarged in diameter and the bottom of the locking recess is brought into close contact with the inner peripheral surface of the through hole of the vehicle body panel, the second locking projection is moved forward of the first locking projection. A grommet configured to be positioned and locked to the first locking projection, and to lock the bottom of the locking recess in pressure contact with the inner peripheral surface of the through hole of the vehicle body panel. 2. The grommet according to claim 1, wherein the folded-back portion that is continuous with the large-diameter cylindrical portion is formed outwardly curved and has a thin wall that is easily bent.