JP3940198B2 - Floor panel waterproofing - Google Patents

Description

【００２２】
【発明の効果】
本発明になるフロアパネル補強部の防水構造によれば、従来の塩化ビニル樹脂シーリング剤と同等の防水性能を示し、更に従来は防水処理のみの箇所であったことに比較すると著しい制振性能を示すため、フロアパネルの剛性補強部の防水と同時に制振性を高めることが可能である。
また、アスファルトシートをハーフトリムとすることにより、制振用と防水用のアスファルトシートを一体化の状態で運搬、保管できるので物流の面、製造現場での在庫管理の面で有利である。
【図面の簡単な説明】
【図１】フロアパネルの補強構造の部分断面図。
【図２】従来のフロアパネルの補強構造の一例の部分断面図。
【図３】アスファルトシートの平面図。
【符号の説明】
１…フロアパネル
２…アスファルトシート
３…ハニカム
４…上部パネル
５…シーリング剤[0001]
BACKGROUND OF THE INVENTION
The present invention mainly relates to a waterproof asphalt sheet for a honeycomb used when a vehicle body floor panel of an automobile is reinforced by a honeycomb and other parts, and a waterproof structure of a floor panel using the same.
[0002]
[Prior art]
Conventionally, improving fuel efficiency by reducing the weight of an automobile has been an issue for the entire automobile industry, and various improvements have been made. Among them, the ratio of automobile steel plates forming the body to the entire weight of the automobile is large, and how to reduce the weight of the body is a major issue.
[0003]
However, on the other hand, the body is deeply related to the safety of the car, and cannot be reduced in weight at the expense of safety. In addition, since a reduction in the rigidity of the body affects the maneuverability of the automobile, the weight reduction of the body must be promoted while maintaining a balance between sufficient safety and rigidity.
[0004]
For this reason, a structure that protects the cabin at the time of collision while using a light steel plate, and various reinforcing materials for reinforcing the rigidity of the steel plate have been used in combination.
Among them, the honeycomb itself is very light in spite of its extremely light weight, and is a material that is often used when trying to achieve both weight reduction and high rigidity.
Japanese Patent Application Laid-Open No. 1-119485 describes a method in which a recess for receiving a honeycomb is formed in a vehicle body floor panel, and an outer peripheral portion of an upper surface plate of the honeycomb is joined to the vehicle body panel by a sealing material such as a sealer.
Japanese Utility Model Laid-Open No. 4-19379 discloses a similar underbody structure of a vehicle body, and describes that a dust sealer at a joint portion can be thickly coated with a vinyl chloride resin.
However, the dust sealer must be applied with a special sealer gun after the sealer is applied to the boundary of the honeycomb, and then evenly smoothed with a tool such as a brush or a spatula. It took skill to get. The same applies to the coating with vinyl chloride resin in that a skilled application work is required.
[0005]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to make it easier to replace the dust sealer and vinyl chloride resin coatings in automobiles, particularly in the case of sealing a rigid reinforcing part by a honeycomb of a floor panel. It is in the point of developing a waterproofing method that can be expected to be effective.
[0006]
[Means for Solving the Problems]
In the seal of the boundary between the honeycomb and the floor panel, instead of the conventional sealer or vinyl chloride resin coating, the center of the asphalt sheet is provided with a half trim or perforation in the same shape as the reinforcing honeycomb in the center. Pull out the part and place it in the concave part of the floor panel, stack the honeycomb on it, place the asphalt sheet where the center part is missing so as to straddle over the boundary part between the honeycomb upper part and the floor panel, The above problems have been solved by a method for waterproofing a floor panel that is fixed by heating.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, it demonstrates according to drawing.
FIG. 1 is a partial sectional view of a floor portion of an automobile. Reference numeral 1 denotes a floor panel forming a floor. Usually, an automotive steel plate having a thickness of 0.65 to 0.8 mm is used. 2 is an asphalt sheet, mainly made of asphalt as a binder component, to which calcium carbonate, barium sulfate, crushed waste paper, fillers such as fibers, additives and the like are added to a sheet having a thickness of about 1.5 to 3 mm. What was processed into the shape is used. Reference numeral 3 denotes a honeycomb which is made of corrugated paper and has a honeycomb structure and is excellent in strength.
[0008]
A desired portion of the floor panel 1 is provided with a concave portion 11 for laminating a reinforcing material, and the honeycomb 3 is installed in the concave portion 11, but the rigidity due to vibration damping of the floor panel 1 and integration with the honeycomb 3 is achieved. An asphalt sheet 21 is placed on the floor panel 1 for application.
[0009]
The waterproof asphalt sheet 22 used for the waterproof portion may be the same as the asphalt sheet 21 placed between the honeycomb 3 and the floor panel 1. Since the waterproof part is only one size larger than the honeycomb part, one asphalt sheet is trimmed according to the outer periphery of the waterproof part and is partially connected to the inner part of the waterproof part. It is also possible to set a trim in a state or a perforation state.
Of course, the asphalt sheet for the honeycomb portion and the asphalt sheet for the waterproof portion may be prepared in advance as two parts.
[0010]
In order to obtain the waterproof structure of the present invention using the asphalt sheet 22, when the asphalt sheets 21 and 22 are integrated as one part in the half trim state, the operator separates the sheet into two sheets. Then, the inner sheet 21 is placed in the floor panel concave portion 11 which is a honeycomb installation location, and the honeycomb 3 is stacked thereon. Further, the upper panel 4 of the honeycomb 3 and the surrounding floor panel are fixed by an appropriate means such as a clamp, and the outer waterproof asphalt sheet 22 separated on the boundary is placed so as to straddle the floor panel 1 and the honeycomb 3. To do.
[0011]
The automobile body that has completed the above operations enters a heating and drying furnace. Although the heating conditions vary, it is usually about 120 to 160 ° C. and about 20 to 40 minutes.
By this heating, the asphalt component of the asphalt sheet 21 is softened, and the floor panel 1 and the honeycomb 3 are fused and integrated to impart vibration damping and rigidity to the floor panel 1.
[0012]
At the same time, the outer asphalt sheet 22 for waterproofing softens the asphalt component and permeates the boundary portion between the portion in contact with the upper panel 4 of the honeycomb 3 and the surrounding floor panel, and exhibits a sealing effect. At the same time, the effect of damping the vibration is given to the honeycomb 3 and the peripheral floor panel 1.
[0013]
The asphalt sheets 21 and 22 are made of asphalt such as straight asphalt, blown asphalt, semi-blown asphalt, rubber-modified asphalt, petroleum resin, thermoplastic resin, thermosetting resin, rubber component, etc. as a binder component. Calcium carbonate, barium sulfate, clay, talc, mica, crushed waste paper, fiber components, and additives such as colorants, dispersants, stabilizers, and the like. The inner damping asphalt sheet 21 and the outer waterproof asphalt sheet 22 may be manufactured in the same composition, and may be manufactured in different compositions as necessary. In this case, it is effective that the inner asphalt sheet is formulated with emphasis on vibration damping performance, and the outer waterproof asphalt sheet is formulated with emphasis on sealing performance by thermal softening.
[0014]
The asphalt sheet can be produced by a conventionally known method and apparatus. That is, a binder component is charged into a disperser such as a kneader that can be heated, and the asphalt component is liquefied by heating, and then a filler component and an additive component are sequentially charged. After being uniformly dispersed, the mixture is cooled and processed into a sheet shape by a processing machine such as a calender roll, cut into a required size, trimmed into a required shape, and the like. At this time, when the inner sheet 21 and the outer sheet 22 are manufactured with the same composition, a half trim or perforation is partially cut at the boundary between the inner sheet and the outer sheet. By applying this, logistics with one part becomes possible.
[0015]
In order for the outer asphalt sheet 22 to seal the boundary portion between the portion of the honeycomb 3 in contact with the upper panel 4 and the floor panel 1, the width of the outer sheet needs to be 80 mm or more. Further, depending on the temperature condition of the heating and drying furnace, it is necessary to sufficiently heat soften and completely seal the gap.
[0016]
[Example 1]
40 parts by weight of straight asphalt is melted and softened by a heating kneader, and 43 parts by weight of calcium carbonate, 5 parts by weight of mica, 6 parts by weight of crushed waste paper and 4 parts by weight of quicklime are mixed and dispersed, and the thickness is 2 mm by a calender roll. Asphalt sheet. This damping material is cut into a rectangle with a long side of 500 mm and a short side of 350 mm, and further, a half is cut so that a rectangle with a long side of 340 mm and a short side of 190 mm is formed inside the damping material. Cut trim processing. The outer sheet was a square-shaped asphalt sheet 22 with a central portion with a width of 80 mm.
[0017]
An inner rectangular asphalt sheet 21 is placed in the recess 11 of the automobile floor panel, the honeycomb 3 is laminated thereon, and the panel 4 on the upper part of the honeycomb is clamped and fixed to the floor panel 1, and then the outer central part is removed. The square-shaped asphalt sheet 22 was placed on the boundary between the panel 4 and the floor panel 1 at the upper part of the honeycomb and heated at 140 ° C. for 30 minutes.
[0018]
[Comparative Example 1]
40 parts by weight of straight asphalt is melted and softened by a heating kneader, and 43 parts by weight of calcium carbonate, 5 parts by weight of mica, 6 parts by weight of crushed waste paper and 4 parts by weight of quicklime are mixed and dispersed, and the thickness is 2 mm by a calender roll. Asphalt sheet 2 was obtained. The sheet is cut into a rectangle having a long side of 340 mm and a short side of 190 mm, and is placed in the concave portion 11 of the automobile floor panel 1 as shown in FIG. After fixing the clamp to the floor panel, the gap between the panel 4 at the top of the honeycomb and the floor panel is sealed with a vinyl chloride resin-based sealant 5 using a sealer gun, and the sealant is uniformly leveled with a brush and then heated at 140 ° C. for 30 Minutes of heating.
[0019]
【Test method】
1) Evaluation of waterproof performance The actual vehicle floor panels of Example 1 and Comparative Example 1 were immersed in a black water-based paint and left for 3 days. Three days later, the water-based paint was pulled out and the degree of penetration of the black paint was observed.
[0020]
2) Vibration damping test The vibration damping material (thickness 2 mm) used in Example 1 was placed on a 30 × 300 × 0.8 mm size automobile steel plate, 10 minutes at 120 ° C., and 20 minutes at 140 ° C. Was dried by heating, and after cooling, the loss factor was measured at a frequency of 200 Hz by the impedance method.
[0021]
【result】
1) Waterproof performance evaluation A black water-based paint that did not enter was evaluated as good.
2) Damping test The evaluation was based on loss factors of 20 ° C, 40 ° C and 60 ° C. The loss factor indicates that the greater the number, the higher the damping performance.
The results are shown in Table 1.
[Table 1]

[0022]
【The invention's effect】
According to the waterproof structure of the floor panel reinforcing portion according to the present invention, the waterproof performance equivalent to that of a conventional vinyl chloride resin sealing agent is exhibited, and further, the vibration damping performance is significantly higher than that of the conventional waterproof treatment only. For the sake of illustration, it is possible to enhance the vibration damping performance simultaneously with the waterproofing of the rigid reinforcing portion of the floor panel.
In addition, by using a half-trim asphalt sheet, the asphalt sheet for vibration control and waterproofing can be transported and stored in an integrated state, which is advantageous in terms of logistics and inventory management at the manufacturing site.
[Brief description of the drawings]
FIG. 1 is a partial sectional view of a reinforcing structure of a floor panel.
FIG. 2 is a partial cross-sectional view of an example of a conventional reinforcing structure for a floor panel.
FIG. 3 is a plan view of an asphalt sheet.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Floor panel 2 ... Asphalt sheet 3 ... Honeycomb 4 ... Upper panel 5 ... Sealing agent

Claims (1)

In the method of reinforcing the floor panel of an automobile with a honeycomb, the central part of the asphalt sheet having a half trim or perforation provided in the center is almost the same shape as the reinforcing honeycomb and is placed in the recess of the floor panel. A waterproofing method for a floor panel, in which a honeycomb is laminated thereon, and the asphalt sheet from which a central portion is removed is placed so as to straddle the boundary between the upper part of the honeycomb and the floor panel, and is fixed by heating.

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