JP3684836B2 - Grommet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a grommet, and more particularly to a grommet having flexibility, waterproofness, soundproofing, and restoring properties.
[0002]
[Prior art]
Generally, in a vehicle, a wire harness is routed between an engine room and a vehicle interior, and this wire harness is inserted through a through-hole formed in a vehicle body panel between the engine room and the vehicle interior. Yes. In order to prevent the wire harness from touching and damaging the through hole, a grommet is usually attached to the through hole.
[0003]
Conventionally, as such a grommet, a grommet configured as shown in FIG. 5 is known. In FIG. 5, the grommet 1 is formed integrally with a large-diameter portion 2 having an engagement groove 2 </ b> A that engages with a through-hole of a vehicle body panel on the outer peripheral surface and one end side of the large-diameter portion 2. And a small-diameter portion 4 that locks the wire harness 3 inserted through the portion 2.
[0004]
Since rainwater or the like enters the engine room during traveling, the grommet 1 is filled with a liquid molding material 5 in order to prevent the rainwater and the like from entering the vehicle compartment via the grommet 1. In order to fill the mold material 5, a cylindrical filling cup 6 is provided inside the large diameter portion 2.
[0005]
In addition, an air layer 7 is provided inside the large-diameter portion 2 in order to prevent noise from being transmitted from the engine room to the vehicle compartment via the grommet 1. The air layer 7 is defined by a soundproof film 8 formed integrally with the large diameter portion 2 on the other end side of the large diameter portion 2 and bent toward the small diameter portion 4, and an inner wall surface 2 </ b> B of the large diameter portion 2. It is made.
[0006]
[Problems to be solved by the invention]
However, in the above conventional grommet, if an operator touches the wire harness 3 in the assembly line and tilts the wire harness 3 with respect to the vehicle body panel and tilts the filling cup 6, as shown in FIG. The tip of the membrane 8 is detached from the filling cup 6 and the air layer 7 is in communication with the outside. In such a state, there is no air layer and there is a drawback that the soundproofing effect is remarkably reduced.
[0007]
Further, since the grommet body is made of an elastic body such as rubber, when the inclined wire harness 3 is returned to a normal state, the soundproof film 8 is separated from the small diameter portion 4 by the elastic force as shown in FIG. It will be in the state which extended to the other side. Normally, the filling of the mold material is performed from the direction A in the figure. Therefore, in the state where the soundproof film 8 is directed to the side opposite to the small diameter portion 4, it becomes an obstacle when filling the mold material, and the filling operation becomes very difficult. There is also a drawback.
[0008]
An object of the present invention is to provide a grommet that can secure an air layer in the large-diameter portion and can easily fill a mold material even when the wire cup is tilted with respect to the vehicle body panel and the filling cup is tilted. It is in.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 includes a large-diameter portion fixed to a through hole of a vehicle body panel, a small-diameter portion integrally formed on one end side of the large-diameter portion, A wire harness is inserted into the inside along with the small-diameter portion, and a filling cup having a cylindrical shape for filling a mold material around the wire harness from the other end side of the large-diameter portion, An air layer shielded from the outside is provided inside, and in the grommet configured to prevent sound from being transmitted through the grommet body, the end portion of the filling cup is extended and the extension portion is extended. The extension portion is engaged with the inner wall surface of the large-diameter portion to form the air layer, while the inner wall surface of the large-diameter portion and the extension portion are provided with a locking portion, For the body panel When Yahanesu said filled cup is inclined is tilted, the are those wherein the air layer I both engaging portion or hook together is secured, as the locking portion, the axis of the grommet body in the large-diameter portion the inner surface A plurality of protrusions are provided at a distance along the direction .
[0010]
According to the above configuration, since the extension portion of the end portion of the filling cup is folded outward and the tip end is engaged with the inner surface of the large diameter portion, an air layer for soundproofing is formed in the large diameter portion. . Even if the wire harness is inclined with respect to the vehicle body panel and the filling cup is tilted, the locking portion at the distal end of the extension is caught by the locking portion on the inner wall surface of the large diameter portion. Can be secured. Further, since the distal end of the extension portion is engaged with the inner wall surface of the large diameter portion, the extension portion does not interfere with the molding material filling operation.
[0011]
In addition, as the locking portion, a recess that can be hooked on the plurality of protrusions can be formed at the end of the extension portion. In this case, it is convenient that the concave portion is easily caught on the ridge.
[0012]
If the extension part of the filling cup is formed in a trumpet shape with the tip side widened, the extension part engaged with the inner wall surface of the large diameter part has a curved surface shape, so that the wire harness is inclined with respect to the vehicle body panel. Even if the filling cup tilts, an air layer can be secured with a margin.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a longitudinal section of a grommet according to the present invention, and is a view when a wire harness is inserted. As shown in FIG. 1, a grommet 10 according to the present invention includes a large diameter portion 11 having a space inside and a small diameter portion 12 provided on one side of the large diameter portion 11. A flat wall 11A is formed on one side of the large-diameter portion 11, and a small-diameter portion 12 is provided at the center of the wall 11A. And the large diameter part 11, the flat wall 11A, and the small diameter part 12 are integrally formed.
[0014]
An engagement groove 11B is formed on the outer peripheral surface of the large diameter portion 11, and the grommet 10 can be fixed to the vehicle body panel 13 by engaging the engagement groove 11B with a through hole 13A formed in the vehicle body panel 13. it can. Further, a cylindrical filling cup 14 formed integrally with the large diameter portion 11 is provided inside the large diameter portion 11, and an extension portion 15 is provided on the filling cup 14. The extension 15 is formed integrally with the filling cup 14, and the filling cup 14 is folded outward at the tip portion.
[0015]
The extension portion 15 is locked to the inner wall surface 11 </ b> C with its distal end portion in surface contact with the inner wall surface 11 </ b> C of the large diameter portion 11. As a result, an air layer 16 defined by the filling cup 14, the extension 15, and the inner wall surface 11 </ b> C is formed inside the large diameter portion 11. The air layer 16 is for preventing noise from being transmitted from the engine room to the vehicle interior via the grommet 10. Further, a recess 15A is provided at the tip of the extension 15 so that the extension itself is bent in a U-shape. On the other hand, a first protrusion 11D and a second protrusion 11E to which the recess 15A can be hooked are provided on the inner wall surface of the large diameter portion 11 (see FIG. 2). The 1st protrusion 11D and the 2nd protrusion 11E are arrange | positioned at predetermined distance along the axial direction of the grommet 10 main body.
[0016]
The filling cup 14 and the small diameter portion 12 are arranged on the same axis, and a wire harness 17 is inserted inside. A small protrusion 12A is provided on the inner wall surface of the small diameter portion 12, and the wire harness 17 inserted into the small diameter portion 12 is locked by the small protrusion 12A and is prevented from moving in the axial direction. The inner diameter of the filling cup 14 is set larger than the inner diameter of the small diameter portion 12, and only a slight gap is formed between the inner wall surface of the small diameter portion 12 and the wire harness 17. A large gap is formed between them. A portion near the small diameter portion 12 side of the filling cup 14 is filled with a liquid molding material 18. This mold material 18 is for preventing rainwater or the like that has entered the engine room from traveling into the vehicle compartment via the grommet 1 during vehicle travel.
[0017]
Further, as shown in FIG. 2, the extension portion 15 is formed in a trumpet shape in which the tip side is widened, and when the extension portion 15 is engaged with the inner wall surface 11 </ b> C of the large diameter portion 11, the extension portion 15 forms a curved surface shape. . FIG. 2 shows a state when the grommet 10 according to the present invention is formed. As shown in FIG. 2, the extension portion 15 is formed without being folded back.
[0018]
According to the grommet 10 having the above-described configuration, even when the filling harness 14 is tilted by tilting the wire harness 17 with respect to the vehicle body panel 13 in the assembly line, as shown in FIG. Since the extension portion 15 is not detached from the inner surface of the large diameter portion 11 by being caught by the ridge 11E formed on the inner wall surface 11C of the large diameter portion 11, the air layer 16 can be secured inside the large diameter portion 11. it can. As a result, the soundproofing effect by the air layer 16 can be maintained.
[0019]
Further, when the inclined wire harness 17 is returned to the normal state as shown in FIG. 3, the grommet 10 is made of an elastic body such as rubber, so that the entire extension portion 15 is brought into a state at the time of molding by the elastic force. Although it is going to be, the whole recessed part 15A is hooked on the protrusion 11E, and will be in the state as shown in FIG. Also in this case, the air layer 16 is secured. In the state of FIG. 4, the extension 15 is folded back and does not exist in front of the filling cup 14 (the lower side in the figure), so that it does not interfere when the mold material is filled from the B direction. The filling operation can be easily performed.
[0020]
1 is ideal when the grommet 10 is attached to the vehicle body panel 13, but when the wire harness 17 is once inclined and the grommet 10 is in the state shown in FIG. Even if the wire harness 17 is in a normal state, it does not become as shown in FIG. 1 but becomes as shown in FIG. However, there is no problem because the air layer 16 is secured even in the state of FIG.
[0021]
【The invention's effect】
As described above, according to the present invention, even if the wire harness is tilted with respect to the vehicle body panel in the assembly line and the filling cup is tilted, the locking portion at the distal end of the extension portion is It is hooked by the 1st protrusion and the 2nd protrusion which are arrange | positioned at predetermined distance along the axial direction of the grommet main body which is a latching | locking part , and the air layer in a large diameter part can be ensured. As a result, noise can be prevented from being transmitted to the vehicle interior via the grommet. Further, when the inclined wire harness is returned to a normal state, the extension portion does not come off from the inner wall surface of the large diameter portion, so that the filling work of the molding material can be easily performed.
[0022]
Furthermore, the extension portion of the filling cup is formed in a trumpet shape with the tip side widened, so that the extension portion becomes a curved shape when engaged with the inner wall surface of the large diameter portion, and the wire is connected to the vehicle body panel. Even if the harness tilts and the filling cup tilts, an air layer can be secured with a margin.
[0023]
In addition, the protrusion on the inner wall surface of the large-diameter portion and the recess at the tip of the extension can be formed integrally with the grommet body, which is advantageous in terms of manufacturing cost.
[0024]
According to invention of Claim 4, a recessed part becomes easy to catch on a protrusion, and ensuring of an air layer can be made still more reliable.
[Brief description of the drawings]
FIG. 1 shows a grommet according to the present invention, and is a longitudinal sectional view when a wire harness is inserted.
FIG. 2 is a longitudinal sectional view of the grommet according to the present invention when it is molded.
FIG. 3 is a longitudinal sectional view showing a grommet according to the present invention when the wire harness is inclined.
FIG. 4 shows a grommet according to the present invention, and is a longitudinal sectional view when an inclined wire harness is returned to a normal state.
FIG. 5 is a longitudinal sectional view showing a conventional grommet when a wire harness is inserted.
FIG. 6 is a longitudinal sectional view showing a conventional grommet when the wire harness is inclined.
FIG. 7 is a longitudinal sectional view showing a conventional grommet when a tilted wire harness is returned to a normal state.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Grommet 11 Large diameter part 11B Engaging groove 11C Inner wall surface 11D 1st protrusion 11E 2nd protrusion 12 Small diameter part 13 Body panel 14 Filling cup 15 Extension part 15A Recess 16 Air layer 17 Wire harness 18 Mold material

Claims (2)

A large-diameter portion fixed to the through hole of the vehicle body panel, a small-diameter portion integrally formed on one end side of the large-diameter portion, and a wire harness inserted therein together with the small-diameter portion; A cylindrical filling cup for filling a mold material around the wire harness from the other end side, and an air layer shielded from the outside is provided inside the large diameter portion, and the grommet body is In the grommet configured to prevent sound from being transmitted through the air layer,
While extending the end portion of the filling cup and folding the extension portion outward, the tip of the extension portion is engaged with the inner wall surface of the large-diameter portion to form the air layer,
A locking portion is provided on the inner wall surface of the large-diameter portion and the tip of the extension portion, and when the wire harness is inclined with respect to the vehicle body panel and the filling cup is tilted, the both locking portions are hooked to each other, and An air layer is ensured , and as the locking portion, a plurality of protrusions are provided on the inner surface of the large-diameter portion at a distance along the axial direction of the grommet body. .   2. The grommet according to claim 1, wherein the extension portion is formed in a trumpet shape in which a distal end side is widened.

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