JP2954499B2 - Support structure of foamable material in hollow structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support structure for a foamable material in a hollow structure, and more particularly, to a pillar, a rocker panel, and a loop of a vehicle body having a hollow box-shaped closed cross-section formed by a plurality of panels. The present invention relates to a support structure for supporting a foamable material that blocks the hollow chamber by foaming the hollow chamber by external heating in order to enhance vibration suppression, sound insulation, and the like of a hollow structure such as a fusing panel. .

[0002]

2. Description of the Related Art Conventionally, in order to support a foamable material 121 in a hollow chamber 106 of a pillar 101 as a hollow structure, for example, as shown in FIG. When the screw 111a of the bolt 111 is inserted into the hollow chamber 106 by a predetermined length, the foam 111 is inserted into the screw 111a through the washer 120.
There is a structure in which the foamable material 121 is supported inside the hollow chamber 106 of the pillar 101 by inserting the 121. Further, the foamable material as described above and a support structure for the foamable material are disclosed in, for example, Japanese Patent Application Laid-Open No. H2-276836.

[0003]

As described above, the bolts 111 inserted into the hollow chambers 106 of the pillars 101 as described above.
In the conventional support structure in which the foamable material 121 is inserted into and supported by the screw portion 111a of the pillar 111a, when the foamable material 121 expands and expands due to heating from the outside of the pillar 101, The foaming material 121 is expanded and expanded more than necessary in the longitudinal direction of the hollow chamber 106 as shown in FIG. For this reason, when the expansion of the expandable material 121 is completed, a large amount of the expandable material 121 is required in order to ensure that the hollow body 106 is shut off by the expandable body 122, resulting in an increase in cost.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, it is an object of the present invention to be able to efficiently block a hollow chamber of a hollow structure by using a small amount of a foamable material. An object of the present invention is to provide a support structure for a foamable material in a hollow structure that can easily and surely hold a porous material with a simple structure.

[0005]

In order to achieve the above object, a supporting structure for a foamable material in a hollow structure according to the first aspect of the present invention foams into a hollow chamber of the hollow structure by external heating. A supporting structure for supporting a foamable material that blocks the hollow chamber, thereby forming a substantially annular foamable material along an inner peripheral wall surface of the hollow chamber, and holding the foamable material with a holder. Holded in the hollow chamber by a plate, the holder plate is a plate body smaller than the cross section of the hollow chamber, a peripheral wall provided on the plate body along the inner peripheral surface of the foamable material,
A restricting flange that protrudes from at least one of the plate body and the wall and restricts foaming of the foamable material, and a fixing flange that is fixed to an inner peripheral wall surface of the hollow chamber are provided integrally with each other. I have. Further, the support structure of the foamable material in the hollow structure according to the invention of claim 2 is as follows:
The support structure for a foamable material in a hollow structure according to claim 1, wherein the plate body, the peripheral wall, the limiting flange,
The holder plate integrally provided with the fixing flange is formed by pressing a single metal plate. The support structure for a foamable material in a hollow structure according to the invention of claim 3 is the support structure for a foamable material in a hollow structure according to claim 1 or 2, wherein the holder plate has a fixing flange having a hollow structure. Is fixed by spot welding to the inner peripheral wall surface of the hollow chamber.

[0006]

In the supporting structure of the foamable material in the hollow structure according to the present invention, the holder plate holding the foamable material is provided at its fixing flange with the hollow plate of the hollow structure. It is fixed to the inner peripheral wall. In the state described above, the foamable material expands and expands due to external heating of the hollow structure. At this time, since foaming to at least one side of both sides of the foamable material is restricted by the restricting flange, foaming expansion of the foamable material is promoted in a direction toward the inner peripheral wall surface of the hollow chamber, The peripheral edge due to the foaming expansion surely adheres to the inner peripheral wall surface of the hollow chamber. Further, by forming the holder plate by press working using a single metal plate as a material, the number of parts can be minimized. Further, by fixing the holder plate to the inner peripheral wall surface of the hollow chamber of the hollow structure by spot welding at the fixing flange thereof, the holder plate can be quickly and reliably fixed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 2 and 3, there are a plurality of hollow structures 1 constituting a pillar, a rocker panel, a roof side panel and the like of a vehicle body, and in this embodiment, a total of three metal members including an upper panel 2, a lower panel 3 and a side panel 4. The flanges 2a, 3a, 4a of the panel are spot-welded to form a hollow box-shaped closed section.

[0008] Inside the hollow chamber 5 of the hollow structure 1,
A foamable material 21 that blocks the hollow chamber 5 by foaming and expanding by heating from the outside is mounted in a state supported by the holder plate 31. The foamable material 21
As shown in FIGS. 1 and 2, it is formed in a substantially annular plate shape along the inner peripheral wall surface of the hollow chamber 5 and at a required gap. Further, the foamable material 21 has a required number of mounting holes 22 penetrating therethrough, and a part of the mounting holes 22 is opened in consideration of ease of assembly with the holder plate 31.

In this embodiment, as the foamable material 21, for example, a foamable material having a composition disclosed in Japanese Patent Application Laid-Open No. 2-276836 is used. Incidentally, the compounding of this foamable material is a copolymer of ethylene and methyl acrylate-MIO.7, MA 15% by weight 63.55, LDPE (melting point
1.5 ° C, density 0.919) 275,4,4-di-tertbutylperoxy n-butylvalerate (Trigonox 29
/ 40) 0.63, bis (tert-butylperoxyisopropyl) benzene (Perkadox 14/40)
1.63, benzenesulfonyl hydrazide (Cellogen OT) 3.62, azodicarbonamide (Porofor ADC-K) ADC-K 1.81, and di-ethylene glycol (DEG) 1.81 (total ratio is Weight basis). The porophore component contains zinc which activates the foaming activity. Then, a foamable material 21 having a specific shape required by injection molding or extrusion molding is formed. This foamable material
21 is foamed and cured at a temperature of 110 ° C to 190 ° C to form a closed-cell foam. The foamable material 21 is not limited to the above-mentioned composition, but may be any foamable material that can be heated and foamed.

The holder plate 31 for holding the orderable material 21 inside the hollow chamber 5 includes a plate body 32, a peripheral wall 33, a first limiting flange 34, a second limiting flange 35, a fixing flange 36, and a mounting piece. 37 are integrally formed, and are formed by pressing a single metal plate as a raw material. The plate main body 32 is formed in a shape appropriately smaller than the cross section of the hollow chamber 5, and a first limiting flange 34 extending around the plate main body 32 so as to be flush with the plate main body 32. And a peripheral wall portion 33 formed along the inner peripheral surface of the ordering material 21 and bent at right angles to the plate body 32 are alternately formed. In this embodiment, first limiting flanges 34 are respectively formed at a total of four places in each of the upper, lower, left and right central parts toward FIG. 1 or FIG. 2, and peripheral wall parts 33 are formed at four places between these first limiting flanges 34, respectively. Is formed.

At the center of each of the left and right first restriction flanges 34, a mounting piece 37 which is inserted into each mounting hole 22 of the foamable material 21 to position and hold the foamable material 21 is cut and raised. It is formed in the shape of a bridge. Further, a second limiting flange 35 extending in parallel with the first limiting flange 34 is formed at the end of each of the peripheral wall portions 33 by bending. And foamable material 21
Is attached to the holder plate 31 in a state where it is expanded at the opening thereof, is fitted to the outer periphery of the peripheral wall portion 33, and the mounting piece 37 is inserted into the mounting hole 22. First limiting flange protruding above the plate body 32
A fixing piece 36 fixed to the inner surface of the upper panel 2 of the hollow structure 1 by spot welding is formed at the projecting end of the projecting end 34 at a right angle.

In this embodiment constructed as described above, the upper panel 2, the lower panel 3 and the side panel 4 constituting the hollow structure 1 are connected to their mutual flanges 2a, 3a, 3a.
Before spot welding at 4a, the upper panel 2
The holder plate 31 is fixed to the inner surface of the base plate by spot welding at a fixing flange 36 thereof. An unfoamed foamable material 21 is attached to the holder plate 31.
Thereafter, the upper panel 2, the lower panel 3, and the side panel 4 are spot-connected at their mutual flanges 2a, 3a, 4a, thereby forming a hollow structure 1 having a hollow box-shaped closed cross section. Here, the foaming material 21 is heated by external heating, for example, by external heating at the time of baking painting of the vehicle body.
Is expanded and expanded as shown in FIGS.

When the foamable material 21 is expanded and foamed, the foamable material 21 is formed by first and second restriction flanges 34 and 35 facing the left and right sides of the foamable material 21, respectively.
Is restricted on the left and right sides. That is, with respect to the longitudinal direction of the hollow chamber 5, the foaming expansion of the expandable material 21 is limited by the first and second limiting flanges 34 and 35, and in the direction toward the inner peripheral wall surface of the hollow chamber 5. On the other hand, the foaming expansion of the foamable material 21 is effectively promoted. Then, the peripheral portion of the foamed body 23 due to the foaming expansion of the foamable material 21 securely and satisfactorily adheres to the inner peripheral wall surface of the hollow chamber 5. As a result, the hollow space 5 is efficiently shut off by the foam 23 caused by the foaming expansion of the foamable material 21 in a very small amount.

In the above embodiment, the case where the holder plate 31 is formed by pressing a single metal plate as a raw material is exemplified. However, the present invention is not limited to this. May be constituted by
Only the fixing flange 36 may be a metal plate that can be welded to the hollow structure 1, and the other portions may be formed by injection molding of a synthetic resin. Further, the holder plate 31 may be fixed to the inner peripheral wall surface of the hollow structure 1 by bonding the holder plate 31 to the fixing flange 36 with a heat-resistant adhesive.

[0015]

As described above, according to the present invention,
When the foamable material is foamed and expanded by heating from the outside of the hollow structure, foaming to at least one of both sides of the foamable material is restricted by the restricting flange,
Foaming and expansion of the foamable material is promoted in the direction toward the inner peripheral wall surface of the hollow chamber, and the peripheral edge portion due to the foaming and expansion reliably adheres to the inner peripheral wall surface of the hollow chamber. As a result, the hollow chamber can be efficiently shut off with a very small amount of the foaming material, and the vibration and soundproof effect can be obtained. Further, by forming the holder plate by press working using a single metal plate as a material, the number of parts can be minimized, and cost can be reduced. Further, by fixing the holder plate to the inner peripheral wall surface of the hollow chamber of the hollow structure by spot welding at the fixing flange, the holder plate can be quickly and reliably fixed, and an unexpected displacement of the holder plate can be performed. And foaming failure of the foamable material caused by the misalignment thereof can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a holder plate and a foamable material according to one embodiment of the present invention are separated.

FIG. 2 is a front sectional view showing a state where a foamable material is supported by a holder plate in a hollow chamber of the hollow structure.

FIG. 3 is a view similar to FIG. 2 showing III (A) -III (A) and III (B) -III (B).
And FIG. 3 is a cross-sectional view based on lines III (C) -III (C).

FIG. 4 is a front sectional view showing a state in which a foamable material is foamed and expanded in the hollow chamber.

FIG. 5 is a graph of V (A) −V (A) and V (B) −V (B) of FIG. 4;
And V (C) -V (C) sectional views based on the V (C) line, respectively.

FIG. 6 is a cross-sectional view showing a conventional foamable material support structure.

FIG. 7 is a cross-sectional view showing a state where the expandable material is expanded and expanded.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hollow structure 5 Hollow chamber 21 Foamable material 31 Holder plate 32 Plate main body 33 Peripheral wall part 34 First limiting flange 35 Second limiting flange 36 Fixed flange

────────────────────────────────────────────────── ─── Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B29C 33/00-33/76 B29C 44/00 B60R 13/08 B60R 13/02 WPI (DIALOG)

Claims (3)

(57) [Claims] 1. A supporting structure for supporting a foamable material that blocks the hollow chamber by being foamed by external heating in the hollow chamber of the hollow structure, and is provided along an inner peripheral wall surface of the hollow chamber. Forming a substantially annular foamable material, holding the foamable material in the hollow chamber with a holder plate, wherein the holder plate has a plate body smaller than a cross section of the hollow chamber, A peripheral wall portion provided on the plate main body along the inner peripheral surface, a restricting flange that protrudes from at least one of the plate main body and the wall portion and restricts foaming of the foamable material, A support structure for a foamable material in a hollow structure, comprising: a fixing flange fixed to an inner peripheral wall surface; 2. The support structure for a foamable material in a hollow structure according to claim 1, wherein the plate body, the peripheral wall portion,
A support structure for a foamable material in a hollow structure, wherein a holder plate integrally provided with a limiting flange and a fixed flange is formed by pressing a single metal plate. 3. The support structure for a foamable material in a hollow structure according to claim 1, wherein the fixing flange of the holder plate is spot-welded to an inner peripheral wall surface of a hollow chamber of the hollow structure. A support structure for a foamable material in a hollow structure, being fixed.