JP2003252064A - Glass run - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a glass run which can reduce the bottoming sound generated when a door glass is raised and closed. <P>SOLUTION: In the glass run fitted to a door sash 1 of an automobile, a block piece 20 formed of sponge rubber L of a low density of 0.15 to 0.4 which is elastically brought into contact with a bottom part 2 of the door sash 1 is provided on an outer surface of a base part 12 of a glass run body 11 formed of a solid rubber S. A recessed part 13 is formed in an outer surface of the base part 12 of the glass run body 11, and the block piece 20 formed of sponge rubber L of a low density of 0.15 to 0.4 which is elastically brought into contact with the bottom part 2 of the door sash 1 is provided in the recessed part 13. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grass run which is attached to a door sash of an automobile and reduces so-called bottom noise generated when the door glass is raised and closed.

[0002]

2. Description of the Related Art A description will be given with reference to FIGS. BACKGROUND ART Conventionally, in a glass run 30 attached to a door sash 1 of an automobile, various measures have been taken in order to prevent generation of a bottoming sound generated when the door glass 3 is raised and closed.

Generally, as shown in FIG. 2, an outer lip portion 33 that elastically contacts the door sash 1 is integrally provided on the base portion 32 of the grass run body 31, or as shown in FIG. The base portion 32 is provided with an inner lip portion 34 that elastically contacts the tip surface of the door glass 3. Both of them are made of a solid rubber material S as a whole.

Further, as shown in FIG. 4, a normal sponge having a specific gravity of 0.4 to 0.6 elastically contacting the tip end surface of the door glass 3 is attached to the base 32 of the glass run main body 31 made of the solid rubber material S. There is also one provided with a cushioning piece 35 made of a rubber material N.

[0005]

Although these conventional glass runs can suppress the generation of bottom noise to some extent, they are still not sufficient, and there is room for improvement.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a grass run capable of significantly reducing the bottom noise generated when the door glass is raised and closed.

[0007]

Means for Solving the Problems A description will be given with reference to FIGS. 1 and 5 to 7. A first aspect of the present invention is a glass run to be mounted on a door sash 1 of an automobile, in which the outer surface of a base 12 of a glass run main body 11 made of a solid rubber material S has a specific gravity of 0.1 which elastically contacts the bottom 2 of the door sash 1.
A block piece 20 formed of a low-density sponge rubber material L having a size of 5 to 0.4 is provided.

A second aspect of the present invention is a glass run to be mounted on a door sash 1 of an automobile, which is a solid rubber material S.
The concave portion 1 is formed on the outer surface of the base 12 of the glass run main body 11 formed in
3 and the bottom portion 2 of the door sash 1 is formed in the recess 13 thereof.
The block piece 20 is made of a low-density sponge rubber material L having a specific gravity of 0.15 to 0.4 elastically contacting with.

A third aspect of the present invention is the first or second aspect of the present invention, wherein the block piece and the glass run body 11 are coextruded and integrally formed.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the first invention is shown in FIG.
And shown in FIG. The grass run 10 is attached to a door sash 1 of an automobile, and a grass run main body 11 including a base portion 12, a side portion 14, an outer seal lip portion 15 and an inner seal lip portion 16 is formed of a solid rubber material S. There is. Then, the block piece 20 elastically contacted with the bottom portion 2 of the door sash 1 is provided on the outer surface of the base portion 20.
Are integrally provided by coextrusion molding. The block piece 20 is formed of a low-density sponge rubber material L having a specific gravity of about 0.15 to 0.4. The block piece 20 can also be fixed to the grass run main body 11 by an adhesive means such as an adhesive or a double-sided tape.

Block piece 20 made of low-density sponge rubber
As a means to be provided on the outer surface of the base 12 of the grass run main body 11, the glass run main body 11 may be co-extruded integrally or may be separately molded and integrated by various bonding means such as an adhesive or a double-sided tape. Is good, but in terms of manufacturing cost,
A method of co-extrusion and integral molding with the glass run body 11 is preferable.

Further, the low-density sponge rubber material has a specific gravity of 0.1.
If it is less than 5, it becomes difficult to stably manufacture the glass run main body 11, especially when co-extruded integrally with the grass run main body 11, and therefore it is not preferable. On the other hand, if the specific gravity exceeds 0.4, the bottoming sound reducing effect is reduced, which is not preferable.

Further, in the embodiment of the present invention, only the example of the door sash of the sash door type vehicle is shown and described, but the same applies to the case where the retainer is integrated with the door panel of the panel door type vehicle. It is possible.

The specific gravity of the low-density sponge rubber material is 0.15
However, it is more preferably 0.2 to 0.3 in consideration of both the bottoming sound reduction effect and stable production.

When this glass run 10 is used, when the door glass 3 is raised and closed, the front end of the door glass 3 collides with the door sash 1 with the base portion 12 sandwiched between the base portion 12 and the door sash 1. Block piece 20 formed between low density sponge rubber material L (specific gravity 0.15 to 0.4)
Since the block piece 20 softens the impact at the time of a collision, and absorbs the impact sound, the bottom sound can be significantly reduced.

The reason why the block piece 20 can significantly reduce the bottomed sound is that it is made of the low-density sponge rubber material L. Instead of the low-density sponge rubber material L, a normal sponge rubber material N (specific gravity 0.4 to 0.
6) can also be used, but in that case the bottom sound cannot be significantly reduced.

Further, instead of the low density sponge rubber material L,
It is also conceivable to use a highly foamed open-cell sponge material having a specific gravity of 0.05 to 0.14 (for example, Nitto Denko Corporation, trade name: Epto Sealer). However, the high-foam open-cell sponge material has a smaller specific gravity and a larger compression set than the low-density sponge rubber material L. Therefore,
Initially, the bottoming sound can be effectively reduced as well as the low-density sponge rubber material L, but permanent deformation occurs with the passage of time, and the performance thereof sharply deteriorates. Therefore, it is not appropriate to use the high-foam open-cell sponge material in place of the low-density sponge rubber material L.

The technical idea of using the low-density sponge rubber material L to reduce the bottomed sound has not existed so far. The specific gravity of the glass run main body 11 is 1.0 to
Since the solid rubber material S of 1.2 is used, the specific gravity is 0.
It is technically difficult to integrally provide the low-density sponge rubber material L having a specific gravity of 15 to 0.4 and a large difference in specific gravity from the solid rubber material S by co-extrusion molding. It has been thought that it would deviate from common sense. The present inventor has wiped out the conventional fixed concept and has created a novel invention that has not existed so far.

In the first aspect of the invention, as shown in FIG. 6, an inner lip portion 17 that elastically contacts the door glass 3 may be provided on the inner surface of the base portion 12. By providing the inner lip portion 17, it is possible to further reduce the bottom sound.

An embodiment of the second invention is shown in FIG. In this glass run 10, a concave portion 13 is formed on the outer surface of a base 12 of a glass run body 11 made of a solid rubber material S, and the concave portion 13 has a specific gravity of 0.15 to 0.4 elastically contacting the bottom portion 2 of the door sash 1. It is characterized in that a block piece 20 formed of a certain low-density sponge rubber material L is provided.

Since the block piece 20 is provided in the concave portion 13, the assembling posture of the block piece 20 with respect to the base portion 12 can be made more stable, so that the bottom noise can be reliably reduced for a long period of time. It has the effect of being able to.

[0022]

EXAMPLES The present inventors conducted experiments using low-density sponge rubber material L and normal sponge rubber material N to determine how much each can reduce impact sound (bottom sound). This experiment is similar to the block piece 20 (2m
m), the low-density sponge rubber material L and the normal sponge rubber material N are respectively attached to the base 12 of the glass run main body 11.
Solid rubber material S set to the same thickness (2 mm)
The sheet material attached to the is placed on an iron metal base, on which an iron ball having a diameter of 35 mm and a weight of about 198 g is placed 100 m.
dropped from a height of m, with a height of 50 mm and 50 mm
The impact sound was measured with a microphone installed at a remote location.
The result is shown in the graph of FIG.

As is clear from this experiment, the sheet material using the low-density sponge rubber material L significantly reduces the impact noise as compared with the sheet material using the normal sponge rubber material N. Therefore, the glass run 10 according to the present invention in which the block piece 20 is formed of the low-density sponge rubber material L
It has been revealed that compared with the block piece 20 formed of the normal sponge rubber material N, the generation of the bottomed sound can be significantly reduced.

[0024]

EFFECT OF THE INVENTION First invention (the invention according to claim 1)
The glass run 10 according to the above is provided with the door sash 1 on the outer surface of the base 12 of the glass run main body 11 formed of the solid rubber material S.
Since the block piece 20 formed of the low-density sponge rubber material L having a specific gravity of 0.15 to 0.4 elastically contacting the bottom portion 2 of the above is provided, the bottomed sound generated when the door glass 3 is lifted and closed. Can be significantly reduced.

In the glass run 10 according to the second invention (the invention according to claim 2), a recess 13 is formed on the outer surface of the base 12 of the grass run main body 11 made of the solid rubber material S, and the recess 13 is provided with the door sash. Since the block piece 20 formed of the low-density sponge rubber material L having a specific gravity of 0.15 to 0.4 elastically contacting the bottom portion 2 of 1 is provided, the assembling posture of the block piece 20 with respect to the base portion 12 is more stable. Can be As a result, it is possible to reliably reduce bottoming sound for a long period of time.

[Brief description of drawings]

FIG. 1 is a side view showing an automobile to which a grass run is attached.

FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, showing a conventional grass run.

FIG. 3 is a cross-sectional view taken along line AA in FIG. 1, showing another conventional grass run.

FIG. 4 shows another conventional grass run,
It is the sectional view on the AA line in FIG.

5 shows an embodiment of the first invention and is a cross-sectional view taken along the line AA in FIG.

FIG. 6 shows another embodiment of the first invention and is a cross-sectional view taken along the line AA in FIG.

7 shows an embodiment of the second invention and is a cross-sectional view taken along the line AA in FIG. 1. FIG.

FIG. 8 is a comparison diagram of impact sounds of a normal sponge rubber material and a low-density sponge rubber material.

[Explanation of symbols]

1 door sash 2 door sash bottom 3 door glass 10 grass run 11 grass run body 12 base 13 recess 14 sides 15 Outer seal lip 16 Inner seal lip 17 Inner lip 20 block pieces 30 grass run 31 grass run body 32 base 33 Outer lip 34 Inner lip 35 buffer piece L Low density sponge rubber material S Solid rubber material N Normal sponge rubber material

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshihiro Ikuma             2-8 Nishi 2-3, Shino-cho, Nishi-ku, Hiroshima City, Hiroshima Prefecture             Kawaruba Industry Co., Ltd. F term (reference) 3D201 AA25 CA19 DA03 DA31 DA34                       EA04B

Claims (3)

[Claims] 1. A glass run to be attached to a vehicle door sash (1), the outer surface of a base (12) of a glass run main body (11) formed of a solid rubber material (S),
The specific gravity that makes elastic contact with the bottom (2) of the door sash is 0.15
A grass run provided with a block piece (20) formed of a low-density sponge rubber material (L) of 0.4. 2. A glass run to be mounted on a door sash (1) of an automobile, wherein a recess (13) is formed on an outer surface of a base (12) of a glass run main body (11) made of a solid rubber material (S), A glass run in which a block piece (20) made of a low-density sponge rubber material (L) having a specific gravity of 0.15 to 0.4 that elastically contacts the bottom portion (2) of the door sash is provided in the recess. 3. The glass run according to claim 1, wherein the block piece (20) and the glass run body (11) are co-extruded and integrally formed.