JP2746856B2 - 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. 8, bolts 111 are provided from the outside of an inner pillar panel 102. 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 unnecessarily 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, an object of the present invention is to provide a hollow structure of a hollow structure with a foamable material that forms an annular shape along an inner peripheral wall surface of the hollow structure. By holding by a holder plate having a main body, a foam by foaming expansion of the foamable material,
To block the hollow chamber with the plate body,
Thereby, the hollow chamber of the hollow structure is efficiently shut off by a small amount of the foamable material. Further, there is provided a support structure for a foamable material in a hollow structure capable of easily assembling a foamable material to the holder plate and capable of holding the foamable material in a ring shape and expanding the foam. That is.

[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 an annular foamable material along an inner peripheral wall surface of the hollow chamber, and holding the foamable material with a holder plate. The holder plate is held in the hollow chamber, the holder plate is smaller than a cross section of the hollow chamber, a peripheral wall provided on the plate main body along an inner peripheral surface of the foamable material, and the plate main body. And a restricting flange that protrudes from at least one of the periphery and the peripheral wall of the foaming material to restrict foaming of the foaming material. Is, at its opposite openings engaged detachably engaged, the opening is closed the locking means are provided. The supporting structure of the foamable material in the hollow structure according to the second aspect of the present invention is the support structure of the foamable material in the hollow structure according to the first aspect, wherein the engaging means includes an opening of the foamable material. Of these, it is constituted by a locking projection projecting from one opening surface and an engaging recess formed in the other opening surface. The supporting 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 locking projection is formed from a base end to a tip end. The engaging recess is formed in a dovetail shape in which the locking projection is removably inserted from the lateral direction while being formed in a reverse tapered shape having an increased width dimension toward the portion.

[0006]

In the supporting structure of the foamable material in the hollow structure according to the present invention configured as described above, first,
The foaming material is fitted into the peripheral wall of the holder plate while being expanded at the opening, and the opening of the holder plate is closed by the locking means, whereby the foaming material is assembled to the holder plate. For this reason, there is no problem that it becomes difficult to assemble the foamable material due to the restriction flange protruding from the periphery or the peripheral wall of the plate body of the holder plate. As described above, after the foamable material is assembled to the holder plate, the foamable material is disposed together with the holder plate in the hollow space of the hollow structure. here,
The foamable material expands and expands due to external heating of the hollow structure. At this time, the foamable material expands and foams in a state of being closed in an annular shape by the locking means. Furthermore, 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 portion of the foam due to the foaming expansion surely adheres to the inner peripheral wall surface of the hollow chamber. Further, the inner peripheral side of the foam is securely adhered to the peripheral portion of the plate body of the holder plate and its peripheral wall portion. Then, the hollow chamber is effectively and reliably shut off by the foam and the plate main body without a shut-off failure. In addition, the locking means is constituted by a locking projection projecting from one of the openings of the foaming material and an engagement recess formed in the other opening, so that the locking means is exclusively used. The necessity of the configuration with the above components is eliminated. Further, the foaming material is favorably held in an annular closed state by forming the locking projections in a reverse tapered shape and the engaging recesses in a dovetail shape into which the locking projections are inserted from the lateral direction.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 4 and 5, 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, 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 to 3, it is formed in a substantially annular plate shape along the inner peripheral wall surface of the hollow chamber 5 and with a required gap. Further, the foamable material 21 is partially cut and opened in consideration of the assemblability to the holder plate 31,
The opening is provided with a locking means 25 which is disengageably engaged to close the opening.

In this embodiment, the locking means
25 is not formed by a dedicated part, and among the openings of the foamable material 21, a locking projection 26 protruding from one opening surface, and an engagement recess 27 recessed in the other opening surface. It is constituted by. Further, in order to increase the engaging force between the locking projection 26 and the engaging recess 27 and positively prevent the locking projection 26 from coming off, the locking projection 26 has a width dimension from the base end toward the tip end. The engagement recess 27 is formed in a dovetail shape in which the locking projection 26 is detachably inserted from the lateral direction while being formed in an increased reverse taper shape.

Further, 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. By the way,
The composition of this foamable material is based on ethylene and methyl acrylate.
Copolymer-MIO.7, MA 15% by weight 63.55, LDPE
(Melting point 1.5 ° C, density 0.919) 275,4,4-di-tert-butylperoxy n-butyl valerate (Trigonox
ox) 29/40) 0.63, bis (tert-butylperoxyisopropyl) benzene (Perkadox) 14
/ 40) 1.63, benzenesulfonyl hydrazide (cello-
Cellogen OT) 3.62, Azodicarbonamide (Porofor ADC-K) ADC-K) 1.81, and di-
Ethylene glycol (DEG) 1.81 (all ratios are by weight). 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 foamable material 21 inside the hollow chamber 5 is composed of a plate body 32, a peripheral wall 33, a first limiting flange 34, a second limiting flange 35, and a fixed flange 36, respectively. And formed by pressing a single metal plate as a raw material. The plate body 32 is formed in a shape appropriately smaller than the cross section of the hollow chamber 5, and the plate body 32
And a first limiting flange 34 protruding on the same plane as the plate body 32, and a peripheral wall portion bent along the inner peripheral surface of the foamable material 21 and perpendicular to the plate body 32. 33
Are alternately formed. In this embodiment, FIG.
Alternatively, first limiting flanges 34 are respectively formed at a total of four places in the upper, lower, left and right central portions toward FIG. 4, and peripheral wall parts 33 are formed at four places between the first limiting flanges 34, respectively.

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. A hollow structure 1 is provided at the projecting end of the first limiting flange 34 projecting above the plate body 32.
A fixing piece 36 fixed to the inner surface of the upper panel 2 by spot welding is bent 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 the flanges 2a, 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.
When assembling the foamable material 21, as shown in FIG.
The foamable material 21 is expanded in a state where the engagement between the locking projection 26 and the engagement concave portion 27 at the opening is released, and is fitted to the outer periphery of the peripheral wall portion 33. As shown in FIG. 3 and FIG. 4, the locking projection 26 is inserted from the lateral side of the engagement recess 27 and engaged to close the opening of the foamable material 21, thereby forming the foam on the holder plate 31. The conductive material 21 is assembled. For this reason, there is no problem that the first and second restriction flanges 34 and 35 make it difficult to attach the annular foamable material 21 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 to form the hollow structure 1 having a hollow box-shaped closed cross section. Here, the foamable material 21 is foamed and expanded as shown in FIG. 4 and FIG. 5 by the external heating, for example, the external heating at the time of the baking coating of the vehicle body, to form the foam 23.

When the expandable material 21 is expanded and expanded, the expandable material 21 is maintained in a closed state based on the engagement force between the locking projection 26 and the engagement recess 27 and expands and expands. Further, the first and second restriction flanges 34 and 35 facing the left and right sides of the foamable material 21 respectively form the foamable material 21.
Is restricted on the left and right sides. For this reason, in the longitudinal direction of the hollow chamber 5, the foaming expansion of the foamable material 21 is limited by the first and second limiting flanges 34 and 35, and a direction toward the inner peripheral wall surface of the hollow chamber 5. In contrast, the expansion of the expandable 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. Also,
The inner peripheral side of the foam 23 is securely adhered to the peripheral edge of the plate body 32 of the holder plate 31 and the peripheral wall thereof. Then, the hollow chamber 5 is shut off by the foam 23 and the plate body 32. This results in a very small amount of foamable material
The hollow chamber 5 is efficiently and reliably shut off by the foam 23 and the plate main body 32 due to the foaming expansion of the 21 and without a faulty shutoff.

In the above-described 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.

[0016]

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, the foamable material is foamed and expanded in a state in which the foamable material is closed in an annular shape by the locking means, and at least one of both side portions of the foamable material. Foaming is limited by the restricting flange, and the peripheral edge of the foam due to the foaming expansion surely adheres to the inner peripheral wall of the hollow chamber, and the inner peripheral side of the foam adheres to the peripheral edge and the peripheral wall of the plate body. As a result, the hollow chamber can be efficiently and reliably shut off with a very small amount of the foaming material without any faulty shutoff.
Good soundproofing can be obtained. Furthermore, when assembling an annular foamable material to the peripheral wall of the plate body of the holder plate, the foamable material is easily assembled by fitting the foamable material into the peripheral wall of the plate body while expanding at the opening. Since it can be attached, there is no problem that it becomes difficult to assemble the foamable material due to the restriction flange protruding from the periphery or the peripheral wall of the plate body of the holder plate. In addition, the locking means is constituted by a locking projection projecting from one of the openings of the foaming material and an engagement recess formed in the other opening, so that the locking means is exclusively used. It is possible to eliminate the necessity of being constituted by the above components, and it is possible to reduce the number of components by that much, and to reduce the cost. Furthermore, by forming the locking projections in a reverse tapered shape and forming the engaging concave portions in a dovetail shape in which the locking projections are inserted from the lateral direction, the foamable material can be favorably held in an annular closed state, Foaming defects caused by unexpected opening of the opening 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 perspective view showing a state in which the engagement between the engaging projection and the engaging recess in the opening of the foamable material is released.

FIG. 3 is a perspective view showing a state in which the opening of the foamable material is closed by the engagement between the locking projection and the engagement recess.

FIG. 4 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. 5 shows V (A) -V (A) and V (B) -V of FIG.
It is sectional drawing based on each (B) line.

FIG. 6 is a front sectional view showing a state in which a foamable material is expanded and expanded in the hollow chamber.

FIG. 7 is also VII (A) -VII (A) and VII (B) -VII of FIG.
It is sectional drawing based on each (B) line.

FIG. 8 is a cross-sectional view showing a conventional foamable material support structure.

FIG. 9 is a cross-sectional view showing a state where the foamable material is expanded and expanded.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hollow structure 5 Hollow chamber 21 Foamable material 23 Foam 25 Locking means 26 Locking projection 27 Engaging recess 31 Holder plate 32 Plate main body 33 Peripheral wall part 34 First limiting flange 35 Second limiting flange 36 Fixed flange

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 an annular foamable material, and holding the foamable material in the hollow chamber by 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 peripheral surface, and a limiting flange that protrudes from at least one of the periphery or the peripheral wall portion of the plate main body and restricts foaming of the foamable material, The foamable material is partially opened and opened, and a locking means for removably engaging the opposite opening and closing the opening is provided. Structure for supporting a foamable material in a hollow structure. 2. The support structure for a foamable material in a hollow structure according to claim 1, wherein the engagement means includes a locking projection projecting from one of the openings of the foamable material, and the other. A supporting structure for a foamable material in a hollow structure, comprising: an engaging recess formed in an opening surface of the hollow structure. 3. The support structure for a foamable material in a hollow structure according to claim 2, wherein the locking projection is formed in a reverse tapered shape whose width dimension increases from a base end to a tip. On the other hand, the engaging concave portion is formed in a dovetail shape in which the locking projection is removably inserted from a lateral direction, and is formed in a groove-like shape.