JP4003426B2 - Grommet with resin inner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a grommet with a resin inner, and more particularly, to make the opening end of a large-diameter cylindrical portion of a grommet main body securely adhere to a vehicle body panel to improve water-stop and dust-proof properties.
[0002]
[Prior art]
As shown in FIG. 7 (A), a wire harness to be routed in an automobile is inserted into a through hole of a vehicle body panel, and the wire harness is protected, waterproof, and dustproof at the through hole insertion portion. A grommet 1 with a resin inner is provided.
[0003]
The grommet 1 with a resin inner contains a resin inner 3 in a large-diameter cylindrical portion 4 continuous with the tip of a small-diameter cylindrical portion 5 of the grommet main body 2.
A locking lip 3a of the resin inner 4 is fitted and locked in an annular recess 4a that is recessed in the inner peripheral surface of the large-diameter cylindrical portion 4, and a seal lip 4b that protrudes from the open end of the large-diameter cylindrical portion 4 And the periphery of the through hole H of the vehicle body panel P are locked between the lock claw 3 b of the resin inner 4.
[0004]
[Problems to be solved by the invention]
In the normal state shown in FIG. 7A, the seal lip 4b at the opening end of the large-diameter cylindrical portion 4 is pressed against the periphery of the through hole H of the vehicle body panel P, so that waterproofing and dustproofing can be reliably achieved.
However, as shown in FIG. 7B, when a force pulling the large-diameter cylindrical portion 4 toward the small-diameter cylindrical portion 5 is applied to the grommet body 2, the locking collar portion 3a of the resin inner 3 and the large-diameter cylindrical portion 4 The engagement with the annular recess 4a becomes sweet, and the large-diameter cylindrical portion 4 turns up in the direction of the arrow in the figure.
[0005]
Then, the seal lip 4b is pulled simultaneously with the movement of the large-diameter cylindrical portion 4 and floats from the vehicle body panel P, and the water is passed through the space S formed between the floated seal lip 4b and the vehicle body panel P. There arises a problem that dust and dust enter the inside.
[0006]
The present invention has been made in view of the above problems, and has a large diameter even when an external force is applied by strengthening a locking force when a resin inner is internally fitted and locked to the large diameter cylindrical portion of the grommet body. It is an object to improve the water-stopping and dust-proofing properties by ensuring that the seal lip at the opening end of the cylinder part is in close contact with the vehicle body panel.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is a grommet with a resin inner that is attached to a wire harness and locked to a through hole of a vehicle body panel of an automobile.
A resin inner (20) is accommodated in the large-diameter cylindrical portion of the grommet body (11) made of an elastic body provided with a large-diameter cylindrical portion at the tip of a small-diameter cylindrical portion for inserting an electric wire, and the distal end opening of the large-diameter cylindrical portion A lock claw (23a) is outwardly attached to a lock piece (23) that is folded outward from the front ends of the four opposite sides of the circumferential wall (21) of the oval cross section of the resin inner (20) that protrudes further. The locking collar (22) protrudes from the lower end of the peripheral wall (21), and the locking collar (22) is provided in the large-diameter cylindrical portion of the grommet body (11). Inserted into and attached to the recess (12a), and the locking hook (11) is provided with a locking claw (23a) and a locking hole (24) consisting of a die punching hole at the time of forming the locking claw The annular recess (12a) of the grommet body (11) It provides a resin inner grommet, characterized in that is provided with a locking projection having a constant width which is inserted into the locking holes (24) in the side wall front end (12a-1).
[0008]
With the above configuration, the locking collar portion of the resin inner is fitted and locked in the annular recess of the large-diameter cylindrical portion, and the locking protrusion of the annular recess is inserted into the locking hole of the locking collar portion. Is inserted and locked, so that even if an external force is applied to the grommet body side and the large-diameter cylindrical portion is pulled, it is locked between the annular recess and the locking collar. In addition, when the locking projection is caught in the locking hole, the large-diameter cylindrical portion can be reliably prevented from turning up with respect to the resin inner fixed to the vehicle body panel by the lock claw. .
Thus, by strengthening the locking force between the resin inner and the large-diameter cylindrical part, the close contact of the opening end of the large-diameter cylindrical part with the vehicle body panel is reliably maintained, and the water and dustproof property is maintained. Can be improved.
[0009]
Further, the locking hole and the locking projection are provided at opposing positions, and the locking projection has a certain width, so that the grommet main body in the direction in which the locking hole and the locking projection exist. Can be reliably prevented from turning up on either side of the opposing surface of the large-diameter cylindrical portion.
[0010]
As described above , the locking hole drilled in the locking collar portion of the resin inner is provided at a position facing the protruding portion of the lock claw, and the mold punching hole at the time of molding the lock claw is used as the locking hole. Yes.
[0011]
When molding the resin inner, molding is easily performed by providing a die punching hole in a part of the locking hook portion corresponding to the position facing the lock claw. By using the die punching hole also as the locking hole, it is not necessary to provide the locking hole separately from the die punching hole, and the work man-hour can be reduced .
[0012]
As described above , the peripheral wall of the resin inner has an oval cross-section, and the lock claw protrudes from the center of the four opposing sides, and a locking hole is formed in the locking collar at a position opposed to the lock claw. Are provided.
[0013]
That is, since the locking projections are locked to the locking holes at the four sides, the locking rod is not only in one direction but also when a pulling force is generated on the grommet body in all directions. The locking of the portion with respect to the annular recess is maintained, and the open end of the large-diameter cylindrical portion can be reliably prevented from turning up.
[0014]
By continuously providing a bellows-like tube portion through the small-diameter tube portion between the two large-diameter tube portions respectively locked in the through holes of the vehicle body panel and the door panel, one of the large-diameter tube portions is provided. Even when the attached door panel is opened and closed, the bellows-like tube portion can be followed by expanding and contracting.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The grommet according to the embodiment is attached between the vehicle body panel P1 and the door panel P2 shown in FIG.
[0016]
The grommet of the embodiment includes a grommet main body 11 and a resin inner 20 attached to the grommet main body.
As shown in FIGS. 1 and 2, the grommet body 11 includes a bellows-like cylindrical portion 16 in which peaks 16 a and valleys 16 b are alternately continued, and a small-diameter cylindrical portion 14 that is continuous at both ends of the bellows-like cylindrical portion 16. , 15 and large-diameter cylindrical portions 12, 13 continuous to the small-diameter cylindrical portions 14, 15, and are integrally formed of rubber or elastomer.
[0017]
The large-diameter cylindrical portions 12 and 13 protrude from the annular recesses 12a and 13a for locking the resin inner 20 for locking the vehicle body and the side walls on the opening side of the large-diameter cylindrical portions 12 and 13 of the annular recesses 12a and 13a. The provided locking projections 12a-1 and 13a-1 and seal lips 12b and 13b protruding from the open ends of the large-diameter cylindrical portions 12 and 13 are provided.
In addition, a tape winding tongue piece 18 for fixing the wire harness is projected from one inner surface of the cylindrical portion to one large diameter cylindrical portion 13 and exposed to the outside through the opening of the large diameter cylindrical portion 13.
[0018]
As shown in FIGS. 3 (A), (B), and (C), the resin inner 20 includes a substantially square frame-shaped peripheral wall 21, a locking collar portion 22 that projects vertically outward from the lower end of the peripheral wall 21, A lock piece 23 folded in a U-shape at substantially the center of the four sides of the peripheral wall 21, a lock claw 23 a protruding from the outer surface of the lock piece 23, and a locking collar 22 at a position below the lock piece 23 And a locking hole 24 drilled in.
[0019]
The grommet is inserted and locked to the vehicle body panel P1 and the door panel P2 with the resin inner 20 attached to the large-diameter cylindrical portions 12 and 13, respectively.
Hereinafter, as a representative example, the state of the resin inner 20 attached to the large-diameter cylindrical portion 12 will be described. As shown in FIG. 4, the locking collar portion 22 of the resin inner 20 is placed in the annular recess 12 a of the large-diameter cylindrical portion 12. At the same time as engaging and locking, the locking protrusion 12 a-1 is inserted and locked into the locking hole 24.
[0020]
When the tip of the resin inner 20 is inserted into the through hole H1 of the vehicle body panel P1, the lock piece 23 bends inward so that the peripheral edge of the through hole H1 gets over the lock claw 23a, and the lock claw 23a and the seal lip The vehicle body panel P1 is press-clamped between 12b.
[0021]
Similarly to the large-diameter cylindrical portion 12 side, the other large-diameter cylindrical portion 13 is also provided with a locking projection 13a- protruding from the side wall on the large-diameter cylindrical portion 13 opening side of the annular concave portion 13a shown in FIGS. In a state where 1 is inserted and locked in the locking hole 24 of the resin inner 20, it is inserted and locked in the through hole of the door panel P2.
[0022]
With the above configuration, the locking flange portion 22 of the resin inner 20 is fitted and locked into the annular recess portions 12a and 13a of the large diameter cylindrical portions 12 and 13, and the annular recess portion 12a is inserted into the locking hole 24 of the locking flange portion 22. The locking projections 12a-1 and 13a-1 of 13a are further inserted and locked. Therefore, even if the large diameter cylindrical portions 12 and 13 are pulled toward the small diameter cylindrical portions 14 and 15, the locking projection 12a- 1 and 13a-1 are caught in the locking hole 24, so that the large-diameter cylindrical portions 12 and 13 can be prevented from turning up with respect to the resin inner 20 fixed to the vehicle body panel P1 by the lock claw 23a. .
As a result, the close contact of the seal lips 12b and 13b at the open ends of the large-diameter cylindrical portions 12 and 13 with the vehicle body panel P1 and the door panel P2 can be reliably maintained, and the water-stopping and dust-proofing properties can be improved.
[0023]
Further, because the lock piece 23 protrudes in a U-shaped folded state on the outer surface of the peripheral wall 21, when molding the resin inner 20, a part of the locking collar portion 22 that hits the lower position of the lock piece 23 is made of gold. In this embodiment, the hole is used as the locking hole 24, so that it is not necessary to provide the locking hole separately from the mold punching hole. Can also be reduced.
Needless to say, the locking hole 24 may be provided at a position other than the position below the lock piece 23 in the locking collar portion 22.
[0024]
Further, in the embodiment, by providing the locking holes 24 of the resin inner 20 and the locking projections 12a-1 and 13a-1 of the large-diameter cylindrical portions 12 and 13 on four sides, respectively, the pulling force to the grommet body is in all directions. Even if it occurs, it is possible to reliably prevent the seal lips 12a and 13a of the large diameter cylindrical portions 12 and 13 from turning up.
In addition, the locking hole 24 of the resin inner 20 and the locking protrusions 12a-1 and 13a-1 of the large-diameter cylindrical portions 12 and 13 may be provided as a pair on any one of the opposing sides, or five or more. The locking force may be further increased.
[0025]
Furthermore, by providing the bellows-like tube portion 16 between the two large-diameter tube portions 12, 13, the bellows-like tube portion 16 can be expanded and contracted even when the door panel P2 to which the one large-diameter tube portion 13 is attached opens and closes.・ Follow can be followed.
In the embodiment, the grommet used between the vehicle body panel and the door panel is described. However, if the grommet is used by fitting the resin inner in the grommet body, the grommet is used between the vehicle body panel and the door panel. It is not limited to grommets .
[0026]
【The invention's effect】
As is clear from the above description, according to the present invention, even if the large-diameter cylindrical portion is pulled toward the small-diameter cylindrical portion by an external force, the locking that protrudes from the side wall of the annular recess of the large-diameter cylindrical portion. Since the protrusion is inserted and locked in the locking hole formed in the locking collar portion of the resin inner, it is possible to prevent the large-diameter cylindrical portion from turning up. Therefore, the close contact of the opening end of the large-diameter cylindrical portion with the vehicle body panel is reliably maintained, and the water and dust resistance is improved.
[0027]
Further, since the locking projections are locked to the locking holes at the four sides, the locking is maintained and the large diameter is maintained even when a pulling force to the grommet body is generated in all directions. It is possible to reliably prevent the tube portion from turning up.
Further, by providing the locking hole in a part of the locking hook portion that is a position facing the lock claw on the peripheral wall of the resin inner, originally, for the convenience of molding the lock claw, the lock claw is formed at a position facing the lock piece. The provided die punching hole can be used as the locking hole, and the number of work steps can be reduced.
[Brief description of the drawings]
FIG. 1 is a front view of a grommet body according to an embodiment of the present invention.
2 is a cross-sectional view of the grommet body of FIG. 1 taken along the line II.
3A is a top view of a resin inner, FIG. 3B is a side view, and FIG. 3C is a cross-sectional view taken along line II-II in FIG.
FIG. 4 is a cross-sectional view of a main part of the grommet.
FIG. 5 is an enlarged view of a main part of the grommet.
FIG. 6 is a perspective view showing an arrangement part of grommets.
7A is a cross-sectional view of a main part of a conventional grommet, and FIG. 7B is a cross-sectional view of a main part showing a problem.
[Explanation of symbols]
11 Grommet body 12, 13 Large-diameter cylindrical portion 12a, 13a Annular recess 12a-1, 13a-1 Locking projection 12b, 13b Seal lip 14, 15 Small-diameter cylindrical portion 16 Bellows-shaped cylindrical portion 18 Tape wound tongue 20 Resin inner 21 Peripheral wall 22 Locking collar 23 Lock piece 23a Lock claw 24 Locking hole W / H Wire harness

Claims (1)

In the grommet with a resin inner that is attached to the wire harness and locked to the through hole of the vehicle body panel of the automobile,
A resin inner (20) is accommodated in the large-diameter cylindrical portion of the grommet body (11) made of an elastic body provided with a large-diameter cylindrical portion at the tip of a small-diameter cylindrical portion for inserting an electric wire, and the distal end opening of the large-diameter cylindrical portion A lock claw (23a) is outwardly attached to a lock piece (23) that is folded outward from the front ends of the four opposite sides of the circumferential wall (21) of the oval cross section of the resin inner (20) that protrudes further. The locking collar (22) protrudes from the lower end of the peripheral wall (21), and the locking collar (22) is provided in the large-diameter cylindrical portion of the grommet body (11). Inserted into and attached to the recess (12a), and the locking hook (11) is provided with a locking claw (23a) and a locking hole (24) consisting of a die punching hole at the time of forming the locking claw The annular recess (12a) of the grommet body (11) Resin inner grommet, characterized in that is provided with a locking projection having a constant width which is inserted into the locking holes (24) in the side wall front end (12a-1).

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