JPH0992060A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fit a grommet to a vehicle body panel by a single operation and inexpensively. SOLUTION: In a grommet 5; having a small diameter tube part 5a into which wire harness W/H is inserted, and a large diameter part 5b, inserting into the through hole 6a of a vehicle body panel 6 to be locked to the inner peripheral edge of the through hole; a burring 6b, protruding from an insertion side surface 6c, is formed on the through hole of the vehicle body panel, and while a folded part 5c, folded outward, is provided on the tip of the large diameter part of the grommet. The folded part is formed of a thin thickness part 5d for making a root bendable inward and outward, a first lip part 5e for abutting on the inner peripheral edge of the through hole of the anti-insertion side surface 6d of the vehicle body panel to be locked, and a third lip part 5g for abutting on the inner surface of the burring; and also a second lip part 5h, for abutting on the peripheral edge of the through hole of the insertion side surface of the vehicle body panel to be locked, is formed on the rear end of the large diameter part.

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 where a wire harness is inserted, and more particularly to a grommet which can be improved in workability of attaching.

[0002]

2. Description of the Related Art A wire harness for an automobile is shown in FIG.
As shown in (A), when the wire harness W / H is routed through the through hole 1a of the vehicle body panel (for example, a dash panel that separates the engine room A and the vehicle room B), a rubber grommet is used. The wire harness W / H is inserted through the small diameter portion 2a of the second portion 2, and in this state, the grommet 2 is inserted into the through hole 1a from the engine room A side toward the vehicle compartment B side, and the outer peripheral concave portion 2c of the large diameter portion 2b is The grommet 2 is attached to the through hole 1a of the vehicle body panel 1 by 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 may bend and be caught in the outer peripheral recess 2c at the inner edge of the through hole 1a. However, in that case, the grommet is not securely attached, and the sealability is poor, causing water leakage. Therefore, since the large diameter portion 2b is pushed into the through hole 1a up to the rear end and then pulled back to prevent the lip portion 2d from being caught, it is possible to prevent pushing and pulling back.
There is a problem that work in the direction is required and mounting workability is poor.

Therefore, as shown in FIG. 6B, instead of the large diameter portion 2b of the grommet 2, a large diameter member 3 made of synthetic resin is fixed and the outer peripheral recess 3a of the large diameter member 3 is fixed. There is provided one that is locked to the inner peripheral edge of the through hole 1a (see Japanese Patent Laid-Open No. 2-66816). However, this structure has a two-piece structure including the grommet 2 and the large-diameter member 3, which causes a problem of high cost.

The present invention has been made to solve the above problems, and an object of the present invention is to make it possible to attach a grommet to a vehicle body panel in one operation by inserting it from one direction and at low cost.

[0006]

In order to solve the above-mentioned problems, according to claim 1 of the present invention, a small-diameter cylindrical portion through which a wire harness is inserted, and a through hole of a vehicle body panel which is continuous with one end of the small-diameter cylindrical portion. In a grommet having a large diameter portion that is inserted into and locked to the vehicle body, an outwardly folded back portion is provided at the tip of the large diameter portion of the grommet on the vehicle body panel side, and at the base of the folding portion In addition, a thin wall portion is provided to facilitate bending, and a first lip portion is provided at the folded portion so as to be pressed against and locked to the inner peripheral edge of the through hole of the surface of the vehicle body panel on the side opposite to the insertion side, while having the large diameter. The grommet is characterized in that a second lip portion is provided at the rear end of the portion so as to come into contact with and lock with the inner peripheral edge of the through hole of the surface on the insertion side of the vehicle body panel.

In the grommet having the above-mentioned structure, when the outwardly turned-back portion of the tip of the large-diameter portion of the grommet is inserted (pushed) into the through hole of the vehicle body panel, the folded portion comes into contact with the inner edge of the through hole and becomes thin. The part bends inward more easily. When the rear end of the folded-back portion is disengaged from the inner edge of the through hole, the folded-back portion is elastically restored, and the first lip portion abuts (seals) the inner peripheral edge of the through-hole on the surface opposite to the insertion side of the vehicle body panel. Be stopped. Further, when the first lip portion is locked to the surface of the vehicle body panel on the side opposite to the insertion side, the second lip portion on the rear end side of the large diameter portion abuts on the inner peripheral surface of the through hole of the vehicle body panel (seal). Then locked. In this way, the first lip portion and the second lip portion are in pressure contact with both surfaces of the vehicle body panel, and the grommet is attached to the vehicle body in a surely sealed state. In addition, the grommet can be attached with one touch by simply inserting it in one direction by pushing it in from the insertion side.

When a burring protruding toward the insertion side is provided in the through hole of the vehicle body panel, the folded-back portion is provided with a third lip portion which comes into contact with the inner surface of the burring of the vehicle body panel. (Claim 2)

In the grommet according to the second aspect, the folded portion is elastically restored so that the first lip portion comes into contact with the surface of the vehicle body panel on the side opposite to the insertion side, and at the same time, the third lip portion contacts the inner peripheral surface of the burring. Contacted and sealed.

Notches may be formed in the folded portion at equal angular intervals on the circumference. (Claim 3) With this configuration, the folding portion is easily bent, and the pushing resistance of the folding portion is reduced, so that the pushing operation can be performed with a lighter operating force.

It is preferable that the rear end of the large-diameter portion has a thick wall that does not easily bend. (Claim 4) With the above configuration, since the rear end of the large-diameter portion is less likely to bend during the pushing operation, the pushing operation can be performed more smoothly.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 and 2, a through hole 6a is formed in a dash panel 6 that partitions an engine room A and a vehicle room B of an automobile.
A cylindrical burring 6b protruding from a surface 6c on the engine room (insertion) A side is formed in the.

On the other hand, the rubber grommet 5 basically has a small-diameter cylindrical portion 5a through which the wire harness W / H is inserted, and a large-diameter portion 5b whose diameter gradually increases continuously at one end of the small-diameter cylindrical portion 5a. The large diameter portion 5b is set to have an outer diameter such that it can be inserted into the through hole 6a with a gap. After passing the wire harness W / H through the small-diameter cylindrical portion 5a, a tape 7 is wound around the wire harness W / H to fix the small-diameter cylindrical portion 5a of the grommet 5 to the wire harness W / H.

At the tip of the large diameter portion 5b, the through hole 6 is formed.
An annular folded-back portion 5c, which has a diameter larger than that of a and is folded outward, is provided continuously and integrally.

A thin portion 5d is formed at the tip of the large diameter portion 5b, that is, at the base of the folded portion 5c, and the entire folded portion 5c on the tip side of the large diameter portion 5b which is difficult to bend easily bends inward and outward. I am able to do that. Folding part 5c
A first lip portion 5e that is abutted (sealed) and locked to the inner peripheral edge of the through hole 6a of the surface 6d of the dash panel 6 on the vehicle interior (counter-insertion) B side is formed at the tip of the.

Between the first lip portion 5e of the folded-back portion 5c and the thin portion 5d, the protrusion 5f projects inward of the burring 6b of the through hole 6a and abuts against the inner surface of the burring 6b (seal). The third lip portion 5g is provided. At the rear end of the large-diameter portion 5b, the through-hole 6 rises outward and is formed in the surface 6c of the dash panel 6 on the engine room A side.
A second lip portion 5h is integrally formed so as to abut (seal) the inner peripheral edge of a and be locked.

In the grommet having the above structure, the grommet 5
When attaching to the through hole 6a of the dash panel 6,
As shown in FIG. 3A, when the folded-back portion 5c of the grommet 5 is inserted (pushed) into the through-hole 6a from the insertion-side surface 6c of the dash panel 6 as shown by the arrow, the folded-back portion 5c is formed into the through-hole. By contacting the inner edge of 6a, the thin portion 5d easily bends inward as shown in FIG. 3 (B).

When further inserting in this state, as shown in FIG. 3 (C), the rear end of the folded portion 5c comes off the inner edge of the through hole 6a, and the folded portion 5c is elastically restored. Then, the first lip portion 5c has the dash panel 6
Is contacted with the inner peripheral edge of the through hole 6a of the surface 6d on the opposite side of the. The first lip portion 5c seals the gap with the surface 6d on the side opposite to the insertion side, and locks the grommet 5 so as to prevent the grommet 5 from coming off (locking) in the direction opposite to the insertion direction.

At the same time, the second lip portion 5h at the rear end of the large diameter portion 5b has a through hole 6a in the surface 6c on the insertion side of the dash panel 6.
The inner peripheral edge of the contact surface comes into contact. This second lip portion 5h
This seals the space between the insertion side surface 6c and
The grommet 5 is retained (locked) in the insertion direction.

Further, the third lip portion 5e abuts on the inner surface of the burring 6b of the through hole 6a of the dash panel 6 and seals the inner surface of the burring 6b.

As described above, the grommet 5 can be attached to the dash panel 6 by one-touch operation only from one direction of pushing in, and is not a two-way reciprocating operation of pushing in and pulling back as in the past. The process can be simplified. In addition, the grommet 5 has a one-piece structure, not a two-piece structure as in the related art, so the cost is low.

As shown in FIG. 5, when there is no burring 6b in the through hole 6a of the dash panel 6, the grommet 5
In addition, the second lip portion 5g is unnecessary. Further, as shown in FIG. 4, when the cutout portions 5i are formed in the folded-back portion 5c of the grommet 5 at equal angular intervals (for example, at intervals of 90 degrees) on the circumference, the folded-back portion 5c is easily bent and the folded-back portion 5c is formed. Since the pushing resistance of is reduced, the pushing operation can be performed with a lighter operating force. Further, as shown by the chain double-dashed lines a and b in FIG. 5, if the rear end of the large-diameter portion 5b of the grommet 5 is formed into the thick-walled portion 5j, the rear end of the large-diameter portion 5b pushed by the finger during the pushing operation is It is less likely to bend and the pushing operation can be performed more smoothly.

[0023]

As is apparent from the above description, the grommet according to the first aspect of the present invention requires only a one-way insertion work in which the folded-back portion of the large diameter portion is inserted into the through hole of the vehicle body panel by pushing. Since it can be attached to the vehicle body panel with one touch, and it is not the two work of pushing and pulling back as in the past, the workability of attachment is improved. Further, since the grommet has a one-piece structure rather than a two-piece structure, the cost is reduced.

The grommet according to the second aspect is suitable for use when a burring is provided in the through hole of the vehicle body panel and a part of the grommet can be pressed against the inner peripheral surface of the burring to seal. If the notch is formed in the folded-back portion as in the grommet according to the third aspect, the pushing resistance of the folded-back portion is reduced, so that the pushing-in work can be performed with a lighter force.
When the rear end of the large-diameter portion is formed into a thick portion that is hard to bend as in the grommet according to the fourth aspect, the rear end of the large-diameter portion does not easily bend during the pushing operation, so that the pushing operation can be performed more smoothly.

[Brief description of drawings]

FIG. 1 is a sectional view of a grommet of the present invention.

FIG. 2 is a perspective view of a grommet.

3 (A), (B), and (C) are partial cross-sectional views at the time of pushing in the grommet.

FIG. 4 is a perspective view of a grommet having a cutout portion.

FIG. 5 is a cross-sectional view of a grommet for a through hole having no burring.

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

[Explanation of symbols]

 W / H wire harness 5 grommet 5a small-diameter tubular portion 5b large-diameter portion 5c folded-back portion 5d thin-walled portion 5e first lip portion 5g third-lip portion 5h second-lip portion 5i notch portion 5j thick-walled portion 6 vehicle body panel (dash panel ) 6a through hole 6b burring 6c, 6d surface

Claims (4)

[Claims] 1. A small-diameter tubular portion for inserting a wire harness,
In a grommet having a large diameter portion which is continuous with one end of the small diameter tubular portion and which is inserted into a through hole of a vehicle body panel and is locked to the vehicle body, at the tip of the large diameter portion of the grommet on the vehicle body panel side, facing outward. A folded-back portion is provided, and a thin-walled portion is provided at the base of this folded-back portion so as to be easily bent inward and outward.The folded-back portion is pressed against the inner peripheral edge of the through hole on the surface of the vehicle body panel on the side opposite to the insertion side and engaged. While providing a first lip portion that stops, a second lip portion that abuts and locks on the inner peripheral edge of the through hole of the surface on the insertion side of the vehicle body panel is provided at the rear end of the large diameter portion. Is a grommet. 2. When a burring protruding toward the grommet insertion side is provided in the through hole of the vehicle body panel,
The grommet according to claim 1, wherein the folded-back portion is provided with a third lip portion that comes into contact with the inner surface of the burring of the vehicle body panel. 3. The grommet according to claim 1, wherein the folded-back portion is provided with notches at equal angular intervals on the circumference. 4. The grommet according to claim 1, wherein a rear end of the large diameter portion is formed to have a thick wall that does not easily bend.