JP2000052445A - Hollow chamber shut-off tool in hollow structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attenuate sound waves in a hollow chamber of a hollow panel and reduce the residual sounds generated by the reflection of sound waves without complicating a structure. SOLUTION: A hollow chamber shut-off tool of a hollow structure is provided with a holder 20 set in a hollow chamber 7 of a hollow structure 1, a foaming base 11 supported by the holder 20 and foamed by the external heating and formed into a foamed body to shut off the hollow chamber 7, and the holder 20 is set in the direction crossing orthgonally the longitudinal direction of the hollow chamber 7 and provided with a supporting plate 21 supporting one side face of the foaming base 11 and controlling the foaming direction of the foaming base 11. A plurality of through-holes 22 are formed through the supporting plate 21 so that a part of the foamed body is so protruded on the outer side face of the supporting plate as to form a foamed protrusion when the foaming base 11 is foamed and formed into the foamed body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow chamber shut-off device for a hollow structure, and more particularly to a hollow panel (a pillar of a body, a rocker panel, and a roof) of a vehicle having a hollow box-shaped closed cross-section formed by a plurality of panels. The present invention relates to a hollow-chamber shut-off device in a hollow structure that blocks a hollow chamber in order to enhance vibration suppression, soundproofing, and the like of a side panel or the like.

[0002]

2. Description of the Related Art In order to efficiently block a hollow chamber of a hollow structure with a small amount of a foamable base material, for example, Japanese Patent Application Laid-Open No. Hei 8-
There is a hollow chamber blocking device in a hollow structure disclosed in Japanese Patent No. 27448. In the hollow chamber blocking device of such a hollow structure, as shown in FIGS. 9 and 10, a holder 1 attached to a hollow chamber 107 of a hollow panel 101 is provided.
20 supported by the holder body 120 and foamed by external heating to form a foam,
And a foamable base material 111 that blocks the base material 7. Further, the holder body 120 is provided in a direction perpendicular to the longitudinal direction of the hollow chamber of the hollow structure, and supports both side surfaces of the foamable base material 111 to regulate the foaming direction of the foamable base material 111. Are provided. Then, the foamable base material 1 is formed by the pair of support plates 121.
In a support state where both side surfaces of 11 are sandwiched without a gap,
Due to the foaming of the foamable base material 111, foaming of the foamable base material 111 is restricted in the longitudinal direction of the hollow chamber 107.

[0003]

SUMMARY OF THE INVENTION In the hollow chamber blocking device of the hollow structure configured as described above, the pair of synthetic resin support plates 121 have flat surfaces, so that the hollow plates are hollow. Hollow chamber 10 of panel 101
When the sound wave in 7 collides with the surfaces of the pair of support plates 121, the sound wave is reflected without being attenuated, and remains as a residual sound.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a hollow structure in a hollow structure capable of attenuating sound waves in a hollow chamber of a hollow panel without complicating the structure and reducing residual sound due to sound wave reflection. It is to provide a room shutoff.

[0005]

According to a first aspect of the present invention, there is provided a hollow structure shut-off device for a hollow structure, comprising: a holder attached to a hollow chamber of the hollow structure; A foamable base material that is supported by and is foamed by external heating to form a foam to block the hollow chamber, and wherein the holder body is provided with the hollow chamber. A support plate is provided in a direction perpendicular to the longitudinal direction of the foamable base material, and supports one side surface of the foamable base material to regulate the foaming direction of the foamable base material. When the foam becomes a foam, so that a part of the foam protrudes from the outer surface of the support plate to form a foam protrusion, the support plate,
A plurality of through holes are provided.

Accordingly, when the foamable base material is attached to the hollow chamber of the hollow structure together with the support plate, and the foamable base material foams into a foam by external heating, the foamable base material is supported by the support plate. By doing so, foaming of the foamable base material is restricted in the longitudinal direction of the hollow chamber,
Foaming of the foamable base material is effectively promoted in a direction perpendicular to the longitudinal direction of the hollow chamber. When the foamable base material foams to form a foam, a part of the foam projects through the plurality of through holes of the support plate and projects to the outer surface of the support plate. Since the outer surface of the support plate forms an uneven surface due to the foaming protrusions formed thereby, the sound waves hitting the uneven surface of the outer surface of the support plate are well attenuated on the uneven surface.

According to a second aspect of the present invention, there is provided a hollow structure shut-off device for a hollow structure, wherein the holder is attached to the hollow chamber of the hollow structure, and is supported by the holder and foamed by external heating to form a foam. A foamable base material that blocks the hollow chamber, and a hollow chamber blocking device in a hollow structure including the holder, wherein the holder body is provided in a direction orthogonal to a longitudinal direction of the hollow chamber, and It has a pair of support plates for supporting the both sides of the foamable base material to regulate the foaming direction of the foamable base material, and when the foamable base material foams to form a foam, A plurality of through holes are provided in the at least one support plate so that a part of the foam protrudes from an outer surface of at least one of the support plates to form a foam protrusion. I have.

[0008] Therefore, when the foamable base material is foamed into a foam, a part of the foamable base material projects through the plurality of through holes of the support plate to the outer surface of the support plate. The outer surface of at least one of the support plates forms an uneven surface due to the foaming protrusion formed thereby. For this reason, the sound waves hitting the uneven surface on the outer surface of the support plate are well attenuated on the uneven surface.

[0009]

(Embodiment 1) Embodiment 1 of the present invention will be described with reference to FIGS. 1 and 2, a hollow panel 1 such as a pillar, a rocker panel, or a roof panel of a vehicle as a hollow structure includes an inner panel 2 and an outer panel 4. 5 and 5 are spot-welded to form a hollow box-shaped closed cross section. At a predetermined position of the inner panel 2, a holder 2
A non-circular mounting hole 6 such as an ellipse, an ellipse, or a square is provided through the mounting hole 6 so as to prevent the rotation of 0.

[0010] A hollow chamber blocking device 10 for blocking the hollow chamber 7 of the hollow panel 1 includes a foamable base material 11 and a holder body 2.
0. The foamable substrate 11 has a temperature of 110 ° C.
It is made of a synthetic resin foamable material mixed with a foaming agent which foams at a temperature of about 190 ° C. Furthermore, the foamable base material 11 has a size and a shape such that an appropriate gap is formed between the foamable base material 11 and the inner peripheral wall surface of the hollow chamber 7 in an unfoamed state, and has a flat plate shape having a predetermined plate thickness. ing.

The holder body 20 is integrally formed by injection molding of a heat-resistant synthetic resin or the like.
1 and the mounting means are integrally provided. The pair of support plates 21 support the both sides of the foamable base material 11 by sandwiching them, and are formed in a flat plate shape in a direction perpendicular to the longitudinal direction of the hollow chamber 7 of the hollow panel 1. Substrate 1
They are integrally connected by a required number of connecting portions (not shown) while maintaining a spacing dimension substantially the same as the thickness dimension of No. 1. Further, the pair of support plates 21 have substantially the same size or slightly smaller shape as the foamable base material 11, and an appropriate gap is set between the pair of support plates 21 and the inner peripheral wall surface of the hollow chamber 7.

Now, the foamable base material 11 foams and the foam 1
5, at least one of the support plates 21 is formed such that a part of the foam 15 protrudes to the outer surface of at least one of the pair of support plates 21 to form the foam protrusion 16. A plurality (many) of through-holes 22 are provided in 21 at predetermined intervals vertically and horizontally. In the first embodiment, in the hollow chamber 7 of the hollow panel 1, in consideration of the fact that sound sources are respectively generated from both sides of the hollow chamber blocking device 10, a plurality (a large number) of the plurality of penetration plates are respectively inserted into the pair of support plates 21. A hole 22 is provided. In the case where a sound source is generated only on one side of the hollow chamber blocking device 10 in the hollow chamber 7 of the hollow panel 1, as shown in FIG. 5, only the support plate 21 corresponding to the sound source is provided. What is necessary is just to penetrate through-hole 22.
Further, as shown in FIG. 1, the through-hole 22 is formed in a substantially circular shape, or is formed in a non-circular shape such as an ellipse, an ellipse, a rectangle, a triangle, and a star. Further, as shown in FIG. 6, the through hole 22 may be formed as a tapered hole whose inside surface side of the support plate 21 is large and whose outside surface side is small.

In the first embodiment, a substantially central portion of one side (lower side in FIG. 1) of a pair of support plates 21 corresponds to the mounting hole 6 of the inner panel 2. Locking clip 3 as mounting means in position
1 are integrally formed. The locking clip 31 includes a pedestal portion 32 projecting from a substantially central portion on one side of a peripheral portion of the pair of support plates 21, a leg portion 33 protruding from the lower surface of the pedestal portion 32 and extending to the mounting hole 6, A pair of elastic locking pieces 34 are provided to extend from both sides of the distal end of the leg 33 in a folded manner and to elastically engage with the mounting holes 6.

[0014] The hollow chamber blocking device 10 of the first embodiment is configured as described above. Therefore, as shown in FIG. 1 and FIG.
After being attached to the hollow chamber 7 of the hollow panel 1 of the vehicle via the mounting holes 6, the foamable base material 11 is foamed by external heating to form a foam 15, so that the hollow chamber 7 is shut off. That is, the inner panel 2 and the outer panel 4 constituting the hollow panel 1 are connected to each other by the flanges 3, 5 thereof.
Before the spot welding is performed, the hollow chamber blocking device 10 is attached to the mounting hole 6 of the inner panel 2 while being prevented from rotating by the retaining clip 30. Thereafter, the inner panel 2 and the outer panel 4 are spot-welded at their mutual flanges 3 and 5 to form the hollow panel 1 having a hollow box-shaped closed cross section. Here, due to external heating, for example, external heating when the entire vehicle body having the hollow panel 1 is baked and painted, the foamable base material 11 foams into a foam 15 (FIGS. 3 and 4). reference).

As shown in FIGS. 3 and 4, when the foamable base material 11 is foamed to form a foam, both sides of the foamable base material 11 are held by a pair of support plates 21. ,
Foaming of the foamable base material 11 is restricted in the longitudinal direction of the hollow chamber 7, and foaming of the foamable base material 11 is effectively promoted in a direction perpendicular to the longitudinal direction of the hollow chamber 7. . Therefore, the foamable base material 11 foams while being supported by the support plate 21 to form a foam 15, and the foam 1
The periphery of 5 is securely adhered to the inner peripheral wall surface of the hollow chamber 7 of the hollow panel 1. Thereby, the hollow chamber 7 of the hollow panel 1 is reliably shut off by the foam 15 based on the foaming of the foamable base material 11 in a small amount.

When the foamable base material 11 is foamed to form a foam 15, a part of the foamable base material 11 is formed on each side of the pair of support plates 21 on both sides of the foamable base material 11. Foamed through a plurality of through holes 22, the supporting plate 21
Protruding from the outside surface of the. As a result, the outer surfaces of the pair of support plates 21 form uneven surfaces by the foam protrusions 16 formed respectively. For this reason, the sound waves emitted from the sound source on one side or both sides of the hollow chamber 7 of the hollow panel 1 hit the concave and convex surfaces of the outer surfaces of the pair of support plates 21 and are well attenuated. Sound is reduced.

(Embodiment 2) Next, a hollow chamber shutoff device 10 according to a second embodiment of the present invention will be described with reference to FIGS. 7 and 8. The hollow chamber shutoff device 10 according to the second embodiment is constructed. Among the foamable base material 11 and the holder body 20, the foamable base material 11 is set at 110 ° C. to 190 ° C. in the same manner as in the first embodiment.
It is formed of a synthetic resin-based foaming material mixed with a foaming agent that foams at the temperature before and after the foaming agent, and in an unfoamed state, an appropriate gap is formed between the hollow panel 1 and the inner peripheral wall surface of the hollow chamber 7. Size and shape.

The holder body 20 is integrally formed by injection molding of a heat-resistant synthetic resin or the like.
1 and a locking clip (not shown) similar to that of the first embodiment. The support plate 21 is formed in a flat plate having a required shape, and the foamable base material 11 is mounted and held at a predetermined position on one side surface by an appropriate holding means. This holding means can be made of an adhesive, but can also be made by projecting a suitable holding piece (not shown) on one side of the support plate 21. A plurality of through-holes 22 are formed in the support plate 21 in substantially the same manner as in the first embodiment. Other configurations of the second embodiment are configured in the same manner as the first embodiment, and therefore, description thereof is omitted.

Therefore, also in the hollow-chamber blocking device 10 of the second embodiment, when the foamable base material 11 foams into a foam, one side of the foamable base material 11 is held by the support plate 21. As a result, the foaming of the foamable base material 11 is restricted in the longitudinal direction of the hollow chamber 7, and the foaming of the foamable base material 11 is effective in the direction orthogonal to the longitudinal direction of the hollow chamber 7. Promoted. For this reason, the peripheral portion of the foam 15 due to the foaming of the foamable base material 11 is
The inner wall of the hollow panel 1
Is closed.

When the foamable base material 11 foams to form a foam 15, at one side of the foamable base material 11, a part of the foamable base material 11 is formed by a plurality of through holes 2 of a support plate 21.
2 and protrudes from the outer surface of the support plate 21. The outer surface of the support plate 21 forms an uneven surface due to the foam protrusion 16 formed thereby. For this reason,
The sound wave emitted from the sound source on one side of the hollow chamber 7 of the hollow panel 1 hits the uneven surface of the support plate 21 and is well attenuated, so that the residual sound due to the reflected sound is reduced.

In the first and second embodiments,
Although the case where the support plate 21 is formed of a heat-resistant synthetic resin material has been exemplified, the present invention is not limited to this, and the support plate 21 may be formed of a metal plate such as an iron plate. In the first and second embodiments, the hollow structure is a pillar of a vehicle,
Although the case of the hollow panel 1 such as a rocker panel or a roof panel has been described as an example, the present invention is not limited to this, and may be other than a hollow panel of a vehicle.

[0022]

As described above, according to the present invention,
An extremely simple structure in which a plurality of through holes are formed in the support plate allows the outer surface of the support plate to have an uneven surface, and attenuates sound waves hitting the uneven surface satisfactorily, thereby reflecting sound waves. Can reduce residual sound.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which a hollow chamber blocking member is attached to a hollow chamber of a hollow panel of a vehicle according to Embodiment 1 of the present invention.

FIG. 2 is a longitudinal sectional view showing a state where the hollow chamber blocking device is attached.

FIG. 3 is a cross-sectional view showing a state where the foamable base material is foamed to form a foam.

FIG. 4 is a longitudinal sectional view showing a state where the foamable base material is foamed to form a foam.

FIG. 5 is an explanatory view showing an embodiment in which a plurality of through holes are formed through only one of the pair of support plates.

FIG. 6 is an explanatory view showing an embodiment of the cross-sectional shape of the through hole with respect to the support plate.

FIG. 7 is a longitudinal sectional view showing a state in which the hollow-room blocking device according to Embodiment 2 of the present invention is attached to the hollow chamber of the hollow panel.

FIG. 8 is a longitudinal sectional view showing a state where the foamable base material is foamed to form a foam.

FIG. 9 is a cross-sectional view showing a state in which a hollow chamber blocking member is attached to a hollow chamber of a hollow panel of a conventional vehicle.

FIG. 10 is a longitudinal sectional view showing a state where the foamable base material is foamed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hollow panel (hollow structure) 2 Inner panel 4 Outer panel 6 Mounting hole 7 Hollow chamber 10 Hollow chamber shutoff 11 Foamable base material 15 Foam 16 Foam projection 21 Support plate 22 Through-hole

Claims (2)

[Claims] 1. A holder comprising a holder attached to a hollow chamber of a hollow structure, and a foamable base material supported by the holder and foamed by external heating to form a foam to shut off the hollow chamber. A hollow chamber blocking device in a hollow structure, wherein the holder body is provided in a direction perpendicular to a longitudinal direction of the hollow chamber, and supports one side surface of the foamable base material. When the foamable base material foams to form a foam, a part of the foam protrudes from the outer surface of the support plate to form a foam protrusion. As described above, a hollow chamber blocker in a hollow structure in which a plurality of through holes are provided in the support plate. 2. A holder which is attached to a hollow chamber of a hollow structure, and a foamable base material which is supported by the holder body and foams by external heating to form a foam to block the hollow chamber. A hollow chamber blocking device in a hollow structure, wherein the holder body is provided in a direction orthogonal to a longitudinal direction of the hollow chamber, and supports both side surfaces of the expandable base material, and the holder body includes the holder body. Having a pair of support plates for regulating the foaming direction of the material, when the foamable base material foams into a foam, the outer surface of at least one support plate of the pair of support plates is A hollow chamber blocking device in a hollow structure having a plurality of through holes formed in at least one of the support plates so that a part of a foam projects to form a foam protrusion.