JP3431273B2 - Grommet - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet used for protecting a wire harness or the like at a penetrating portion of a body or the like.

[0002]

2. Description of the Related Art A body such as a dash panel and a cowl panel of an automobile is provided with an opening for passing a wire harness. In order to pass the wire harness 7 through the opening 91, conventionally, the wire harness 7 is first attached with the grommet C made of a rubber ring, and then these are pulled from the vehicle compartment side to the engine compartment side to open the hole. It has been adapted to fit the grommet C to the edge (Fig. 9). This is for protecting the wire harness 7 with the grommet C and for preventing water from leaking into the vehicle interior. Although FIG. 10 shows a state in which the grommet C is fitted in the opening edge 92 of the mating member 9, the burring 9 is in a vertical standing state from the mating member 9.
In No. 3, the grommet C fits well into the opening edge 92.

[0003]

In recent years, however, the number of parts in the engine compartment and the passenger compartment has increased, and in order to avoid these, the cowl panel and the like are inclined, while the opening 91 is formed (the die-cutting direction). However, the burring 93 is no longer standing vertically to the panel. As a result, the burring 93 is inclined and is in a state of protruding toward the engine compartment. Inclination angle θ of burring 93
Varies depending on the vehicle type, but varies in the range of 15 to 30 degrees (FIG. 6). Under such a circumstance, when the grommet C is attached, a gap S is formed in the attachment groove 11 fitted to the opening edge as shown in FIG. 11, which causes a problem of water leakage into the vehicle interior. Further, the wire harness 7 is usually arranged so as to be extremely bent from the vicinity of the outlet of the grommet C (arrows in FIGS. 10 and 11), and the bending causes the gap S to be further increased to prevent water leakage. Immediately the flaw appeared. In addition, there is a tendency that the plane area of the mating member 9 around the opening 91 is reduced, and even if the annular protrusion P for sealing is provided on the outer edge of the mounting groove 11, a gap M is formed between the mating member 9 and the mating member 9. It has become easier and more useful in many cases (Fig. 10).

The present invention solves the above-mentioned problems. Even if the burring around the opening is tilted or the wire harness is bent, it surely fits the opening edge of the mating member and has a water blocking function. To provide grommets that can exert
To aim .

[0005]

In the grommet of the first aspect of the present invention, a burring is formed which is inclined with respect to the panel surface at the opening edge.
Grommet to be fitted to the opening edge of the mating member
The lower jaw has a mounting groove made of rubber or resin and having a U-shaped cross section to be fitted to the opening edge of the mating member on the annular outer peripheral wall.
Min and the upper jaw portion and the coupling portion and the base portion (1) forming, the roof portion from the open end of the upper jaw portion of the base portion Ru extending inwardly and (2), axially from the inner end of the roof portion the guide portion is extended in a cylindrical shape and (3), provided with a ring-shaped recess in the inner wall portion continuing from said base portion to said roof section (21)
There is formed, and an inner peripheral wall of the base portion corresponding to the position of the mounting groove, and wherein the ring <br/> Jokubomi the joint portion between the lower jaw portion and the connecting portion of the base portion (19) is formed To do. Here, “rubber or resin” may be any rubber as long as it has rubber properties such as chloroprene rubber and ethylene propylene rubber, and is also made of a resin such as soft vinyl chloride resin capable of elastic deformation. Means that it may consist of.

The grommet of the second aspect of the present invention is the grommet of the first aspect of the present invention, wherein the roof portion reduces the diameter of the base portion.
Cormorant covers the upper surface of the base portion with a flat plate of thick, further the guide section forming a U groove that surrounds the the upper surface of the roof portion corresponding to the base of the guide portion and the inner than the outer diameter of the and the base at the bottom surface of the mounting groove co When in a square position Ru is raised a ring-shaped seal ring
Further, an annular protrusion is provided on the vertical surface of the mounting groove . Here, the “U groove” also includes a V-shaped groove. The "lower surface of the mounting groove" is the surface of the mounting groove on the side close to the large diameter opening of the base.

[0007]

[Function] Like the grommet of the first aspect of the present invention, the mounting groove is lowered.
It is formed of a jaw portion, an upper jaw portion, and a connecting portion, and is connected to the lower jaw portion of the base at the inner peripheral wall of the base corresponding to the position of the mounting groove.
When the annular recess in the joint between the sintered parts Ru is formed, the contact
Unique with the joint part as a fulcrum and the lower jaw part accompanied by elastic deformation
Will be able to move. The elastic deformation of the mounting groove is facilitated, and even if the burring at the edge of the opening has an inclination, it closely adheres to it. Also, if a ring-shaped recess is formed in the inner wall that continues from the base to the roof, the base and the roof can be moved independently of each other at the recess, so the grommet can be bent extremely. Also, even if the burring is in an inclined state, the grommets will be absorbed and the grommet will fit to the edge of the aperture. Ring-shaped depression
Is independent of the mandible and the connecting part with respect to the maxillary part
Motion and maintain fit between the base and the rim of the aperture
Is also useful. Like the grommet of the second aspect of the present invention, when a U groove surrounding the guide portion is formed on the upper surface of the roof portion which is the base of the guide portion, a freedom is created in the movement between the guide portion and the roof portion, and the grommet has the U groove. It becomes easy to bend at the part. Is the wire harness near the grommet exit?
In many cases, the roof is bent at the base,
Cover the top of the base with a thick flat plate to reduce the diameter,
In addition, because the U-groove is formed at a low position near the base,
The bending center of gravity of the grommet is lowered, and the wire harness extreme
You can easily work even in a bent arrangement. Further , if a ring-shaped seal ring is raised on the lower surface of the mounting groove and inward from the outer shape of the base portion, even if a sufficient plane area cannot be taken around the opening edge, if a flat surface can be secured only within the seal ring portion, The grommet will be able to ensure water resistance. Of the above mounting groove
If an annular protrusion is provided on the vertical surface, the mating member will have a grommet.
And then open a hole at the corner where the lower surface of the mounting groove intersects the vertical surface.
If the inner edge of the rim is abutted, the seal ring and annular projection
A part that overlaps with the mating member is created, and this overlap part
Due to the elastic deformation, the grommet and the mating member are elastically deformed.
And are in pressure contact with each other, and a higher waterproofness is obtained.

[0008]

EXAMPLES The present invention will be described in detail below based on examples. (1) Example 1 FIGS. 1 to 5 show an example of a grommet according to the present invention. 1 is a vertical cross-sectional view of the grommet, FIG. 2 is a plan view of FIG. 1, FIG. 3 is an enlarged view around the base portion, and FIGS. 4 and 5 are enlarged views of the base portion showing a fitted state with a mating member.

Reference symbol A is ethylene propylene rubber (EP
3D shows a grommet made by rubber molding using the (DM) material. The grommet A includes a base portion 1, a roof portion 2, a guide portion 3 and a stay 4, and the wire harness 7 has an opening 9
It is used as an exterior protective component when penetrating 1 (see FIG. 11).

The base 1 has a ring-shaped mounting groove 11 on the outer peripheral wall.
Thick walled body (outer diameter: about 70 mm, inner diameter: about 50
mm, height: about 20 mm). Mounting groove 1 of base 1
The grommet A is fixed to the mating member 9 by fitting 1 into the opening edge 92 of the mating member 9 (here, the cowl panel) (FIG. 4). The mounting groove 11 is a concave groove having a U-shaped cross section, and is formed by a lower jaw portion 1a, an upper jaw portion 1b, and a connecting portion 1c, which are components of the base portion 1 as shown in FIG. The reason why each part is made thicker is to complete fitting and fixing of the grommet A to the mating member 9. Here, the upper jaw portion 1b forms a descending slope on the upper surface as it goes outward (FIGS. 1 and 2). In addition, FIG. 1 shows XX of FIG.
The longitudinal cross-sectional view of a line arrow is shown.

On the lower surface 12 of the mounting groove 11, there are provided seal rings 13 and 14 which are raised in a ring shape. Seal ring 1
3 and 14 are formed at positions inward of the outer diameter of the base 1, and if the flat surface securing length L is about 6 mm outward from the opening 91 (FIG. 3), these seal rings 13, 14 A stable seal can be secured at. Also,
An annular protrusion 16 is provided on the vertical surface 15 of the mounting groove 11. Then, the grommet A is fitted to the mating member 9,
When the inner end portion 94 of the opening edge 92 comes into contact with the corner portion 17 where the lower surface 12 of the mounting groove 11 and the upright surface 15 intersect, the seal ring 1
3, 14 and the annular protrusion 16 wrap about 0.5 mm,
The structure is such that a portion that overlaps the mating member 9 is created. The presence of this overlapping portion causes the grommet A and the mating member 9 to come into pressure contact with each other due to elastic deformation of the rubber, thereby obtaining a higher waterproofness. Rubber is soft, 0.5
The wrap of about mm can be elastically deformed, and the grommet A is in close contact with the mating member 9. Furthermore, the upper surface 18 of the mounting groove 11 is
The lower surface 12 is made to approach as it goes outward so as to draw a half arc around the corner 17 (FIGS. 4 and 5). No matter which angle the burring 93 is inclined, the tip of the burring 93 should be
This is for contacting the upper surface 18 of No. 1 so that sealing can be performed anywhere. This is also for ensuring that the outer end of the upper surface 18 is in a state in which the mating member 9 around the fitted opening edge 92 is engaged and the grommet A can be reliably fixed to the mating member 9.

On the other hand, the base 1 corresponding to the position of the mounting groove 11
An annular recess 19 (a semicircular recess having a diameter of about 2 mm) is formed on the inner peripheral wall of the. Here, the annular recess 19 is as shown in FIG.
It is preferably provided at the joint between the lower jaw portion 1a and the connecting portion 1c. With this joint as a fulcrum, the lower jaw 1a can move independently in the direction of the arrow in FIG. 4 while accommodating the elastic deformation of the rubber, and it becomes easier to closely adhere to the burring 93 having an inclination. is there.

Reference numeral 2 indicates a roof portion extending inward from the opening end of the upper jaw portion 1b of the base portion 1. Roof part 2
Like the base 1, the base 1 is formed to be thick (about 8 mm thick), and has a form in which the upper surface of the base 1 is covered with a thick flat plate so as to reduce the diameter of the base 1 (FIG. 1). A ring-shaped recess 21 (a semi-circular recess having a diameter of about 2 mm) is formed in the inner wall portion extending from the base portion 1 to the roof portion 2. Due to the formation of the depression 21, when the grommet A is bent, the depression 21 is easily bent, and the deformation applied to the roof portion 2 does not propagate to the base portion 1.
The depression 21 has a lower jaw portion 1a with respect to the upper jaw portion 1b.
Also, it provides independent movement from the connecting portion 1c, and helps maintain the fit between the base 1 and the aperture edge 92.

Reference numeral 3 denotes a guide portion provided on the roof portion 2 and extending in a tubular shape from the inner end of the roof portion 2 in the axial direction (upward in FIG. 1). The guide portion 3 plays a role of guiding and holding the wire harness 7. Therefore, the guide part 3
The inner diameter (about 15 mmφ) of the wire harness corresponds to the bundle diameter of the wire harness 7. The length of the guide portion 3 is about 40 mm. A U-shaped groove 22 is provided on the upper surface of the roof portion 2, which is the base of the guide portion 3.
(About 4 mm depth) is provided so as to surround the guide portion 3. Due to the presence of the U groove 22, the roof portion 2 and the base portion 1 are prevented from being deformed, and the guide portion 3
Only will be able to bend.

Reference numeral 4 indicates a stay arranged in an intersecting shape through the axis of the grommet A (FIG. 2). Stays 4, 4, ...
Is a triangular plate-like body (thickness: about 2 mm) and has a guide portion 3
And the outer wall of the roof portion 2 are joined together. Stay 4
When the grommet A is attached to the opening edge 92 or when the grommet A is bent, the mechanical strength reduction due to the formation of the U groove 22 is reinforced.

When the grommet A thus constructed is fitted into the opening 91 provided in the mating member 9, first, the wire harness 7 is passed through the grommet A (FIG. 1). afterwards,
Holding the guide portion 3 near the upper end, these are pulled out from the vehicle compartment side to the engine compartment side. Then, the opening edge 9
2 slides on the inclined surface of the upper surface of the upper jaw portion 1b of the base 1 and fits into the mounting groove 11.

When the burring 93 that is inclined with respect to the panel surface is formed by the hole edge 92 punched out in a circular shape (FIG. 6), the fitted state is as shown in FIGS. 4 and 5.
When the burring 93 stands up at an acute angle with respect to the panel surface (FIG. 4), the inner end portion 94 of the mating member 9 contacts the corner portion 17. Furthermore, at the time of fitting, the mating member 9 and the seal ring 1
Since there is a wrap with the circular protrusions 3 and 14 and the annular protrusion 16, an external force acts on the lower jaw portion 1a from the mating member 9 in the arrow direction in FIG. However, since the annular recess 19 is provided, the annular recess 19 contracts and absorbs this wrap. Then, the lower jaw 1a with the annular recess 19 as a fulcrum
Even if is rotated, the elastic repulsive force of the rubber that tries to push it back around the annular recess 19 is generated by the rotation. As a result, the seal rings 13 and 14 and the annular protrusion 16 are kept in pressure contact with the mating member 9. The tip of the burring 93 contacts the upper surface 18 of the mounting groove 11.

On the other hand, at the portion where the burring 93 stands up at an obtuse angle with respect to the panel surface (FIG. 5), the inner end portion 94 is the corner portion 1.
7, the tip of the burring 93 is located on the upper jaw 1
Push up the corner created by b and the connecting part 1c. Due to this pushing up, the external force indicated by the black arrow in Fig. 5 is grommet A.
However, the force is absorbed by the depression 21. And about the seal rings 13 and 14 and the annular protrusion 16,
The base 1 is elastically deformed in the same manner as in FIG.
3, 14 and the annular projection 16 are pressed against the mating member 9. Thus, even if the burring 93 is inclined with respect to the panel surface, the recess 21 and the annular recess 19 cause the mounting groove 11
The deformation is flexible, and the grommet A fits the opening edge 92. In particular, since the grommet A of this embodiment is provided with five seal points, which are fitted to the mating member 9 in a pressed state, as described above, perfect waterproofness is secured. Therefore, it is possible to completely prevent water from entering the vehicle interior.

The wire harness 7 is a grommet A.
Often bent extremely near the exit of the U groove 2.
Since 2 is formed, it is possible to sufficiently cope with such bending. That is, since the bending stress applied to the guide portion 3 such as bending is absorbed by the recess 21 and the U groove 22, the external force that affects the sealing property does not propagate to the base portion 1. Further, in the conventional product, the bending center of gravity was high because the thin-walled cone portion 8 was bent (FIG. 11), but since the U-groove 22 was formed at a low position close to the base 1, the bending center of gravity of the grommet A was As a result, the work can be easily performed even when the wire harness 7 is bent extremely. Incidentally, the decrease in mechanical strength due to the formation of the U groove 22 does not cause any problem because the stay 4 reinforces it.
In addition, since the seal rings 13 and 14 are provided on the inner side of the outer diameter of the base portion 1, the water blocking function is exhibited even if the flat portion required around the opening edge 92 of the mating member 9 is small. become able to.

(2) Embodiment 2 In this embodiment, a grommet A is used which uses a rod-shaped stay 4'instead of the plate-shaped stay 4 of Embodiment 1 (FIG. 7). With such a configuration, the stay 4'and the roof portion 2
Since the connecting area with and the flexibility for bending at the U-groove 22 are increased, the bending arrangement of the wire harness 7 can be further facilitated. A protruding piece 31 is extended from the upper end of the guide portion 3. This is because it is easy to insert the wire harness 7 into the grommet A. Other configurations are the same as those in the first embodiment.

(3) Third Embodiment In this embodiment, in addition to the first embodiment, the guide portion 5 is also formed on the base portion 1 side (FIG. 8). This portion of the wire harness 7 is also protected by the guide portion 5,
In addition, the bundle state is secured. In FIG. 8, the grommet A is symmetrical except for the protrusion 31.

The present invention is not limited to those shown in the above embodiments, but can be variously modified within the scope of the present invention depending on the purpose and application. The sizes, shapes, materials, etc. of the base portion 1, the roof portion 2, the guide portion 3, the mounting groove 11, the recess 21, the annular recess 19, the U groove 22, and the guide portion 3 can be changed according to the application.
Although the center of gravity of the roof 2 increases, the roof 2 may have an umbrella shape. The annular recess 19 has a connecting portion 1c or a lower jaw portion 1a.
It refers to the inner wall surface of the base portion 1 according to the above, and may be provided at any position in such a region. In the embodiment, the grommet A for the wire harness 7 is used, but the grommet A for protecting tubes, hoses, cables and the like can be used. Further, it can be applied to the counterpart member 9 having various openings.

[0023]

As described above, the grommet of the present invention is
While protecting the wire harness at the open part of the body etc., it is possible to completely prevent water leakage at such part, and it also exhibits excellent effects such as improving workability of wire harness arrangement. To do.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a grommet according to a first embodiment.

FIG. 2 is a plan view of FIG.

FIG. 3 is an enlarged view around a base portion.

FIG. 4 is an enlarged view of a base portion showing a fitted state with a mating member.

FIG. 5 is an enlarged view of a base portion showing a fitted state with a mating member.

FIG. 6 is a sectional view of a mating member.

FIG. 7 is a vertical sectional view of a grommet according to a second embodiment.

FIG. 8 is a vertical sectional view of a grommet according to a third embodiment.

FIG. 9 is a vertical sectional view of a conventional grommet.

FIG. 10 is a vertical cross-sectional view showing a state in which a conventional grommet is fitted into an opening edge.

FIG. 11 is a vertical cross-sectional view showing a state in which a conventional grommet is fitted into an opening edge.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Base part 1a Lower jaw part 1b Upper jaw part 1c Connection part 11 Mounting groove 12 Lower surface 13,14 Seal ring 16 Annular protrusion 19 Annular recess 2 Roof part 21 Indent (ring-shaped recess) 22 U groove 3 Guide part 4 Stay 9 Counterpart member 92 Opening edge 93 Burring A Grommet

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shiji Katsuhide Aichi Prefecture, Nagoya City Atsuta-ku, Atsuta 1-16-30, Chitose Inoac Corporation Hirakata Works (72) Inventor Keisuke Atsuta-ku, Nagoya City, Aichi Prefecture Millennium 1-chome 16-30 Inoac Corporation, inside the ship side business office (56) Reference JP-A-4-249817 (JP, A) Actual development 55-79620 (JP, U) Actual 60-67615 ( JP, U) Actual Kaihei 2-18217 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16L 5/02 H02G 3/22 H01B 17/58 B60R 16/02 622

Claims (2)

(57) [Claims] 1. A burri which is inclined with respect to a panel surface at an opening edge.
The mating member on which the ring is formed
A grommet that, a rubber or resin, the lower jaw portion and the upper jaw portion a U-shaped cross-section of the mounting groove for fitting into openings edge of the mating member on the outer peripheral wall of the annular
And a base portion (1) formed by the connecting portion, and an upper jaw portion of the base portion
Roof portion from the open end of the partial Ru extending inwardly (2)
When the guide portion is extended in the axial direction in a cylindrical shape from the inner end of the roof section (3), provided with the inner wall portion continuing from the base portion to the roof portion annular recess (21) is formed
And the inner peripheral wall of the base corresponding to the position of the mounting groove ,
An annular recess is formed at the joint between the lower jaw of the base and the connecting portion.
(19) A grommet characterized by being formed . 2. The roof portion reduces the diameter of the base portion.
Yo cover the upper surface of the base portion in the thick flat plate, further wherein the guide portion forming a U groove that surrounds the the upper surface of the roof portion corresponding to the base of the guide portion and the inner than the outer diameter of the and the base at the bottom surface of the mounting groove When in a square position Ru is raised a ring-shaped seal ring
The grommet according to claim 1, wherein both of the mounting grooves are provided with an annular projection on the vertical surface thereof .