JP3516806B2 - Supporting structure of foamable substrate 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 structure for supporting a foamable base material in a hollow structure, and mainly relates to a pillar, a rocker panel of a vehicle body having a hollow box-shaped closed cross section composed of a plurality of panels, In order to enhance vibration damping and soundproofing of hollow structures such as roof side panels and hood panels, a foaming base material that blocks the hollow chamber by foaming by external heating is provided in the hollow chamber. The present invention relates to a support structure for supporting.

[0002]

2. Description of the Related Art A supporting structure for a foamable substrate in a hollow structure of this type is disclosed in, for example, Japanese Unexamined Patent Publication No. 2-276836. In this, the structure in which the foamable base material is inserted into and supported by the threaded portion of the bolt that is thrust into the hollow chamber from the outer surface of the hollow structure, when the foamable base material is expanded and expanded by external heating, The foaming direction of the foamable substrate is not limited, and the foaming is expanded more than necessary in the longitudinal direction of the hollow chamber. For this reason, the amount of the material of the foamable base material required to shut off the hollow chamber becomes large and the cost becomes high. Also,
It is also troublesome to make the threaded portion of the bolt project from the outer surface of the hollow structure and insert the foamable base material into the threaded portion, which requires much labor. Because of this, FIG. 8 to FIG.
As shown in FIG. 0, a foaming base material 121 is attached to a foaming restriction supporting plate 111 in a direction orthogonal to the longitudinal direction of the hollow structure 101, and a pedestal portion 114 is attached to the supporting plate 111.
The pedestal 114 is formed with a detent piece 116 that is inserted into the mounting hole 107 that is formed through the hollow structure 101 by being locked, and an elastic locking piece that elastically engages the mounting hole 107. The formed structure was developed by the same applicant, and Japanese Patent Application No. 7-2
An application has already been filed as No. 91206.

[0003]

By the way, FIGS. 8 to 1
In the support structure shown in 0, a support plate for foaming limitation is provided.
By restricting the foaming direction of the foamable base material 121 by 111, the material of the foamable base material 121 can be saved, and the supporting plate 11 can be attached to the mounting hole 107 of the hollow structure 101.
Can be easily installed by turning 1 However, as shown in FIGS. 11 and 12, when the foamable base material 121 expands and expands into a foam body 122 by external heating, the pedestal 114 of the support plate 111 may become an obstacle to foaming. As shown in FIG. 12, there may be a problem that a gap without the foam 122 is generated between the pedestal 114 and the mounting hole 107 of the hollow structure 101, and water or dust may enter from the gap. is there. In view of the above-mentioned problems, an object of the present invention is to prevent the pedestal portion of the foam limiting support plate from becoming an obstacle to foam expansion of the foamable base material, and to attach the pedestal portion and the hollow structure. And a support structure for the foamable base material in a hollow structure capable of sealing a mounting hole by filling a part of foam based on foam expansion of the foamable base material.

[0004]

In order to achieve the above object, the support structure of the foamable substrate in the hollow structure according to the invention of claim 1 is formed by foaming the hollow chamber of the hollow structure by external heating. A supporting structure for supporting the foamable base material that blocks the hollow chamber by supporting at least one side of both sides of the foamable base material and limiting foaming of the foamable base material. A foam-limiting support plate for forming is provided in a direction orthogonal to the longitudinal direction of the hollow chamber, and a pedestal portion is formed at an end of the support plate.
In the pedestal part, there are respectively a detent piece that is inserted into a non-circular mounting hole that is formed through the hollow structure by being rotated, and an elastic locking piece that elastically engages with the mounting hole. Formed,
Moreover, the pedestal portion is formed with an opening through which a foam based on foam expansion of the foamable base material can be inserted toward the attachment hole.

Therefore, in the support plate for foaming limitation supporting the foamable base material, the detent piece of the pedestal part is fitted into the mounting hole of the hollow structure, and the elastic member of the pedestal part is elastically engaged. When the stopper piece engages with the mounting hole, the support plate is fixed in the direction perpendicular to the longitudinal direction of the hollow chamber of the hollow structure. Then, the foamable base material expands and expands by heating from the outside of the hollow structure, and becomes a foam. When the foamable base material expands and expands, the support plate restricts the foaming in the longitudinal direction of the hollow chamber, and promotes the foaming in the direction orthogonal to the longitudinal direction of the hollow chamber. The peripheral edge of the foam due to the foam expansion of the foamable base material surely adheres to the inner peripheral wall surface of the hollow chamber. Moreover, a part of the foam is foamed toward the mounting hole through the opening of the pedestal, and is filled between the pedestal and the mounting hole.

The support structure for the foamable base material in the hollow structure according to the second aspect of the present invention is the support structure for foamable material in the hollow structure according to the first aspect, wherein the support plate for foaming limitation is used. Is a pair of left and right so as to support both side portions of the foamable base material, and a pedestal portion is integrally provided over the pair of left and right support plates. Therefore, by supporting both side portions of the foamable base material by the pair of left and right support plates, the foaming expansion of the foamable base material in the direction orthogonal to the longitudinal direction of the hollow chamber is further promoted, and the foaming thereof is performed. The peripheral edge portion of the foamed body due to expansion is more surely brought into close contact with the inner peripheral wall surface of the hollow chamber.

A support structure for a foamable base material in a hollow structure according to a third aspect of the present invention is the support structure for a foamable base material in a hollow structure according to the second aspect, wherein the pedestal has an opening. A pair of detent pieces facing each other at a distance are projected,
It is characterized in that a pair of elastic locking pieces are provided in a projecting manner on a connecting piece which is formed so as to straddle the tip portions of the both rotation stopping pieces.

According to a fourth aspect of the present invention, there is provided a support structure for a foamable base material in a hollow structure according to the third aspect of the present invention. An extension portion is formed of the same material as the base material and is formed integrally with the base material and is inserted between the pair of detent pieces and the pair of elastic locking pieces through the opening of the pedestal portion. Therefore, when the foamable base material expands and expands, the extension portion inserted between the pair of detent pieces and the pair of elastic locking pieces also expands and expands through the opening of the pedestal portion of the support plate, The attachment hole is more surely sealed by the foam of the extending portion.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. 1 to 3,
In the pillar 1 of the vehicle body as a hollow structure, the inner panel 2 and the outer panel 4 are mutually flanges 3, 5.
It is spot-welded to form a hollow box-shaped closed cross section. A non-circular shape such as an oval, an ellipse, or a quadrangle (in this embodiment, a support plate 11 for restricting foaming (hereinafter, simply referred to as a support plate) 11 is fixed to a predetermined position of the inner panel 2 by being turned. An attachment hole 7 having an oval shape in the form is provided so as to penetrate therethrough. Inside the hollow chamber 6 of the pillar 1, a foaming base material 21 that blocks the hollow chamber 6 by expanding and expanding by heating from the outside is assembled in a state of being held by a pair of left and right support plates 11. It is attached.

The pair of left and right support plates 11 are in the form of a flat plate in a direction orthogonal to the longitudinal direction of the hollow chamber 6, and between the peripheral edge of the support plate 11 and the inner wall surface of the hollow chamber 6. Is formed in a size and shape such that an appropriate gap is formed. Further, the pair of support plates 11 are formed integrally by a plurality of parallel connecting pieces 13 with a required space therebetween, and a foamable base material 21 is inserted between the support plates 11. It is sandwiched and pinched. Further, at the positions corresponding to the mounting holes 7 of the inner panel 2 on the peripheral portions of the pair of support plates 11, projecting pieces 12 are provided so as to face each other. A pedestal portion 14 having a rectangular plate shape is formed across the space.

As shown in FIGS. 4 and 5, the pedestal portion 14 has a central portion formed with an opening 15 through which a foam 22 formed by foaming and expansion of the foamable base material 21 can be inserted toward the mounting hole 7. It is set up. Further, the pedestal surface of the pedestal portion 14 has an opening 15
A pair of anti-rotation pieces 16 are provided so as to be opposed to each other with a space therebetween.
The pair of detent pieces 16 are fitted in the mounting holes 7 to detent the support plate 11.
16 is a first detent portion 16a extending in the minor axis direction of the mounting hole 7.
And the mounting hole 7 from the center of the outer surface of the first detent portion 16a.
And a second detent portion 16b extending in the major axis direction, and each of them is formed in a substantially lateral T-shaped cross section. Then, a total of 6 positions of the tip portions of the first and second detent portions 16a and 16b abut on the inner peripheral surface of the mounting hole 7, so that the support plate 11 is reliably detented to the mounting hole 7. It is supposed to be done.

A connecting piece 17 is formed so as to straddle between the front end portions of the first detent portions of the pair of detent pieces 16, and a pair of elastic locking members are formed from both side surfaces of the connecting piece 17. A piece 18 is provided so as to project toward the mounting hole 7. The pair of elastic locking pieces 18 are fitted while being elastically contracted in the minor axis direction of the mounting hole 7, and the locking claws that elastically engage with the mounting hole 7 are provided at the respective tip ends thereof. 18a are formed respectively. Further, the pair of support plates 11, the connecting piece 13, the pedestal portion 14,
The rotation stopping piece 16 and the elastic locking piece 18 are integrally formed by injection molding of a synthetic resin material.

Between the pair of support plates 11, there are 11
The foamable base material 21 that becomes the foam 22 by foaming and expanding at a temperature of about 0 ° C. to 190 ° C. is inserted and held in an unfoamed state. The unfoamed foamable base material 21 is formed to have substantially the same size and shape as the support plate 11 and has a wall thickness dimension that is the same as or slightly smaller than the facing spacing dimension of the pair of support plates 11. It is formed in a flat plate shape. The foaming base material 21 is formed with notches 21a into which the connecting pieces 13 of the support plate 11 are inserted. Further, the foamable base material 21 is made of the same material as the base material 21 and is integral with the foamable base material 21, and a pair of detent pieces 16 are provided through the opening 15 of the pedestal portion 14.
And an extending portion 21b inserted between the pair of elastic locking pieces 18 is formed.

In the first embodiment, as the material of the foamable base material 21, for example, a foamable material having a composition disclosed in JP-A-2-276836 is used. By the way, the composition of this foaming material is a copolymer of ethylene and methyl acrylate-MIO.7, MA 15% by weight 6
3.55, LDPE (melting point 1.5 ℃, density 0.919) 27.15, 4,4-
Di-tert-butylperoxy n-butylvalerate (Trigonox29 / 40) 0.63, bis (tert-butylperoxyisopropyl) benzene (Perkadox 14/40) 1.63, benzenesulfonylhydrazide (cellogen) (Cellogen) OT) 3.62, Azodicarbonamide (Porofor ADC-K) 1.81,
And di-ethylene glycol (DEG) 1.81 (all ratios by weight). The porpho component comprises zinc which activates foaming activity. Then, the foamable base material 21 having a specific shape required by injection molding or extrusion molding is formed. The foamable base material 21 is foamed and cured at a temperature of 110 ° C. to 190 ° C. to be a closed cell foam. The foamable base material 21 is not limited to the above-mentioned compound, and may be any foamable material that heats and foams.

In the first embodiment constructed as described above, before the inner panel 2 and the outer panel 4 forming the pillar-1 as the hollow structure are spot-welded at their mutual flanges 3 and 5. The detent pieces 16 and the elastic locking pieces 18 formed on the pedestal portions 14 of the pair of support plates 11 are fitted into the mounting holes 7 of the inner panel 2, respectively. As a result, the pair of support plates 11 are fixed to the mounting holes 7 of the inner panel 2 by being rotated. In addition, an unfoamed foamable base material 21 is previously inserted between the pair of support plates 11, and the extending portion 21b of the foamable base material 21 passes through the opening 15 of the pedestal portion 14 to form a pair. Detent piece
It is inserted between 16 and the elastic locking piece 18.

After the foamable base material 21 is held on the inner panel 2 by the pair of support plates 11 as described above, the inner panel 2 and the outer panel 4 are spot welded at their mutual flanges 3, 5. As a result, a pillar-1 having a hollow box-shaped closed cross section is formed. Here, the foamable base material 21 is exposed to heat from the outside, for example, when the vehicle body having the pillar-1 is baked and applied.
Then, as shown in FIG. 7, the foam is expanded and expanded to form a foam 22.

When the foamable base material 21 is foamed and expanded, the left and right sides of the foamable base material 21 are paired with a pair of support plates 11 in a direction orthogonal to the longitudinal direction of the hollow chamber 6 of the pillar 1. Since it is supported in a state of being sandwiched by, the foaming expansion of the foamable base material 21 is restricted with respect to the longitudinal direction of the hollow chamber 6, and with respect to the direction orthogonal to the longitudinal direction of the hollow chamber 6. Foam expansion of the foamable base material 21 is effectively promoted.
Then, the peripheral edge portion of the foam 22 due to the foaming expansion of the foamable base material 21 surely and satisfactorily adheres to the inner peripheral wall surface of the hollow chamber 6. As a result, the material of the foamable material 21 can be saved.

Further, similar to the expansion and expansion of the expandable base material 21, its extension portion 21b also expands and expands to form a foam body 22b, and the foam body 22b causes a gap between the pedestal portion 14 and the mounting hole 7 of the inner panel 2. The gap is surely closed and the mounting hole 7
Is reliably sealed. Therefore, it is possible to solve the problem that water or rubber enters the hollow chamber 9 of the pillar 1 through the mounting hole 7.

In the above embodiment, the foamable base material 21 is used.
An extension portion 21b is formed on the base plate, and the extension portion 21b is inserted between the pair of detent pieces 16 and the elastic locking piece 18 through the opening 15 of the pedestal portion 14, but the present invention is not limited to this. Output 21
b does not necessarily have to be formed. That is, by configuring a part of the foam 22 based on foam expansion of the foamable base material 21 through the opening 15 of the pedestal portion 14 to be filled between the pedestal portion 14 and the mounting hole 7, The mounting hole 7 can be sealed. Further, in the above-described embodiment, the case where the hollow structure is the pillar-1 of the vehicle body has been illustrated, but the present invention is not limited to this, and for example, the hollow structure may be a rocker panel, a hood panel, or a roof panel of the vehicle body. It may be a sandblast panel or the like, and may be other than the vehicle body.

[0020]

As described above, according to the present invention,
By forming an opening in the pedestal of the support plate, it is possible to fill the foam between the pedestal and the mounting hole to seal the mounting hole, and to improve vibration resistance and sound insulation. In addition to being able to prevent water and dust from entering.

[Brief description of drawings]

FIG. 1 is a perspective view showing a support plate and a foamable base material according to an embodiment of the present invention separately.

FIG. 2 is a cross-sectional view showing a state in which a foaming base material is similarly assembled in a hollow chamber of a pillar by a support plate.

FIG. 3 is a vertical sectional view of the same.

FIG. 4 is an enlarged perspective view of a rotation stopping piece and an elastic locking piece of the base portion of the support plate.

FIG. 5 is a plan sectional view of the same.

FIG. 6 is a transverse cross-sectional view showing a state in which the foamable base material is foamed and expanded into a hollow body of the pillar to form a foamed body.

FIG. 7 is a vertical sectional view of the same.

FIG. 8 is a perspective view showing a support structure for a foamable substrate according to the prior art.

FIG. 9 is a transverse cross-sectional view showing a state in which a foaming base material is likewise assembled in a hollow chamber of a hollow structure by a support plate.

FIG. 10 is a vertical sectional view of the same.

FIG. 11 is a transverse cross-sectional view showing a state in which the foamable base material is also expanded and expanded to form a foam.

FIG. 12 is a vertical sectional view of the same.

[Explanation of symbols]

1 pillar (hollow structure) 6 hollow chamber 7 mounting holes 11 Support plate 14 Pedestal 15 openings 16 times stop piece 18 Elastic locking piece 21 Foamable substrate 21b Extension part 22 foam

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) B29C 44/00 B29C 67/20-67/24 B60R 13/01-13/04 B60R 13/08 B62D 25/00-25 / 08 B62D 25/14-25/22 B29C 39/00-39/44 B29C 45/00-45/84 B29C 33/00-33/76 B29C 41/38-41/44 B29C 43/36-43/42 B29C 43/50 B29C 49/48-49/56 B29C 49/70 B29C 51/31-51/40 B29C 51/44 B32B 15 / 06,15 / 08 B05D 1/00-7/26

Claims (4)

(57) [Claims] 1. A support structure for supporting a foamable substrate that blocks the hollow chamber by foaming by external heating in the hollow chamber of the hollow structure, wherein both side portions of the foamable substrate are provided. Among these, a foam-limiting support plate for supporting at least one side and for restricting foaming of the foamable substrate is provided in a direction orthogonal to the longitudinal direction of the hollow chamber, and the end of the support plate. A pedestal portion is formed in the portion, and the pedestal portion elastically engages with the detent piece that is inserted into the non-circular mounting hole penetrating the hollow structure by being detented. Elastic locking pieces to be fitted together are formed respectively, and furthermore, the pedestal portion is formed with an opening through which a foam based on foam expansion of the foamable base material can be inserted toward the attachment hole. A supporting structure for a foamable base material in a characteristic hollow structure. 2. The support structure for a foamable material in a hollow structure according to claim 1, wherein the support plates for restricting foaming form a left and right pair so as to support both sides of the foamable base material. A support structure for a foamable material in a hollow structure, wherein a pedestal is integrally provided across a pair of left and right support plates. 3. The support structure for a foamable base material in a hollow structure according to claim 2, wherein the pedestal portion is provided with a pair of anti-rotation pieces that are opposed to each other with an opening therebetween, and both anti-rotation elements are provided. A support structure for a foamable base material in a hollow structure, wherein a pair of elastic locking pieces are provided in a projecting manner on a connecting piece formed across the tip of the piece. 4. The support structure for a foamable base material in a hollow structure according to claim 3, wherein the foamable base material is made of the same material as the base material and is integral with the base material through a pair of openings of the pedestal. A hollow structure characterized in that an extension portion is formed between the detent piece and the pair of elastic locking pieces.
Supporting structure of foamable material.