JPH0126519Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention has a vibration damping function superior to that of the conventional one.
The present invention also relates to a vibration-damping floor carpet for an automobile in which a damping material is integrated into the floor carpet for an automobile.

[Prior Art] Conventional floor carpets are designed to suppress vibrations of automobiles, as shown in FIGS. 13, 14, and 15.
Molded (or unmolded) into a predetermined shape as shown in the figure
felt on the back side of the car carpet 1'
It has a sound absorbing material 6 such as glass wool or urethane foam, and has a structure that is set on the floor of an automobile. This conventional floor carpet has poor vibration damping properties, and therefore requires a damping material 7, such as an asphalt sheet, to be adhered to the floor surface of the automobile and mounted thereon.

However, the above-mentioned conventional vibration damping materials have the disadvantage that they require a step of adhering them to the floor surface of an automobile, which increases the number of steps. Further, in the above case, if the damping material is not entirely adhered to the floor surface, a sufficient damping effect cannot be achieved. However, the floor surface of an automobile has a very complex shape, making it difficult to bond the entire surface. Therefore, as shown in FIG. 15, the damping material 7 has poor adhesion to the floor surface and does not have a sufficient damping effect. Furthermore, the weight of the asphalt sheet must be increased to improve vibration damping properties. Therefore, the weight of conventional vibration damping materials was large. Furthermore, the conventional vibration damping material has a large temperature characteristic, and has the disadvantage that the vibration damping effect and the sound insulation effect occur only in a certain temperature range, and both effects are significantly reduced in other temperature ranges. In addition, the conventional vibration damping materials mentioned above produce minute vibration noises (100 to
It also had the disadvantage of having little vibration damping effect at 1000Hz).

[Problems to be solved by the invention] The invention overcomes all of the above-mentioned drawbacks, and does not require the process of adhering the damping material to the floor surface.
The purpose of the present invention is to provide a vibration-damping floor carpet for an automobile that is easily in full contact with the floor surface of an automobile, is light in weight, has a damping effect over a wide temperature range, and has a small vibration-damping effect on minute vibration noise. shall be.

[Means for Solving the Problems] The vibration-damping floor carpet for an automobile of the present invention includes a carpet and a foamed carpet that is integrally formed on the back surface of the carpet and has a back surface shape that approximately follows the shape of the floor surface of the automobile. A vibration absorbing material consisting of a body layer, a plurality of cell bodies held on the back side of the foam layer and exposed on the back side of the foam layer, and inorganic particulate matter held within the cell bodies. It is characterized by the presence of

(1) Carpet One of the components of this vibration-damping floor carpet for automobiles is the carpet. The type of carpet, ie, the size, shape, thickness, length of fibers, color, type of fiber material, type of backing material, etc., are not particularly limited, and can be selected from various types depending on the purpose and use. For example, the carpet may be a felt or a felt-like material obtained by accumulating fibers and subjected to needle punching, a cloth-like material obtained by weaving or knitting fibers, a carpet made by flocking a cloth-like material, or the like. Also, as the backing material, synthetic thermoplastic resins such as polyethylene, polypropylene, polymethyl methacrylate resin, etc. can be used.

(2) Foam Layer One of the constituent elements of the present invention is a foam layer that is integrally formed on the back surface of the carpet and has a back surface shape that approximately follows the shape of the floor surface of the automobile.

The size, shape, thickness, material, etc. of the foam layer are not particularly limited, and various types may be selected depending on the purpose and use. The material of the foam layer is
A material that forms a soft foam layer is preferred, and a material that has strong adhesion to the carpet backing material and the lid member of the vibration absorbing material described below is preferred. As the material of the foam layer, soft polyurethane foam is more preferable. This is because it has flexibility, adhesive strength, mechanical strength, and ease of integral molding.

(3) Vibration absorbing material One of the constituent elements of this vibration damping floor carpet for automobiles is a plurality of cell bodies held on the back side of the foam layer, exposed on the back side of the foam layer, and inside the cell bodies. It is a vibration absorbing material consisting of retained inorganic particles.

The cell bodies may be exposed on the entire back surface of the foam layer, or may be partially exposed on the back surface as shown in FIG. It is preferable because it has a high vibration damping effect.

A plurality of cell bodies may be arranged in a plane and connected to each other to constitute a plane vibration absorbing material. As shown in FIG. 3, a method for arranging cell bodies 3A in a planar manner is as shown in FIG.
It can be made into a sheet of approximately constant thickness. Further, as shown in FIG. 5, it is also possible to form a sheet in which the size of the cells is changed according to the unevenness of the floor surface of the automobile. In addition, a vibration absorbing material composed of a plurality of cell bodies is, for example, an independent cell body 33 as shown in FIG.
It is also possible to have a structure in which the sheets are spread all over the floor of the automobile.

In the vibration absorbing material of the present invention, the cell bodies can all be of the same size, as shown in FIGS. 9 and 10, for example, or they can be of different sizes, as shown in FIG. 5, for example. You can also do it. The shape of the cell body can be various depending on the purpose, for example, it can be approximately cubic as shown in FIG. 9, or rectangular parallelepiped as shown in FIG.

In the vibration absorbing material, the cell body has, for example, a cell body whose entire periphery consists of a container-like member and a lid member, as shown in FIGS.
As shown in the figure, it may consist only of a bag member, or, for example, as shown in FIG. You can also do that. Note that the material and thickness of the container-like member, lid member, and bag member are not particularly limited. As these container-like members, for example, films made of thermoplastic resins such as vinyl chloride, polyethylene, and polypropylene are preferred. Also, the thickness of these films is 10~
Approximately 3000 μm is preferable.

The type, particle size, etc. of the inorganic particulate material constituting the vibration absorbing material are not particularly limited. For example, the inorganic granules are preferably sand, clay, stone, etc., and the particle size is preferably about 1 to 5000 μm. In addition, it is more preferable that the particle size is as fine as possible.

A conventionally used damping material such as an asphalt sheet can also be used in combination with the above-mentioned vibration absorbing material. In this case, an even greater vibration damping effect can be obtained.

The above-mentioned method for manufacturing the vibration absorbing material may be performed using a known method such as filling a container-like member or a bag-like member with inorganic granules, and then sealing the open end of the lid member or bag-like member by gluing it. can. Further, as a sealing method, as shown in FIG. 11, the lid member may be adhered by pressing molten resin onto the opening of the container-shaped member with a rotating roller, or as shown in FIG. 12. As shown in Figure 2, a caterpillar-shaped conveyor with numerous protrusions can be used to seal the opening.

[Example] The present invention will be explained below with reference to Examples.

Example 1 The vibration damping floor carpet for automobiles of this example is as follows:
As shown in FIGS. 1, 2, and 3, a carpet 1 and a soft polyurethane foam layer 2 integrally formed on the back surface of the carpet 1 and having a back surface shape that roughly follows the shape of the floor surface of an automobile. , a sheet-like vibration absorbing material held in the soft foam layer and consisting of a plurality of cell bodies 3A exposed on the entire back surface of the soft foam layer and inorganic particulate matter 3B held in the cell bodies 3A. It consists of material 3 (thickness 5 mm). The cell body 3A consists of a container-like member and a lid member, and is sealed, and sand of about 50 μm is used as the inorganic granular material 3B.

The vibration damping floor carpet for an automobile has the vibration absorbing material made of the plurality of cell bodies set so as to fit the shape of the floor surface of the automobile, and the vibration absorbing material made of the plurality of cell bodies facing the lid member side. Polyurethane was injected and foamed between the carpet 1 and the carpet 1 to integrate the carpet and the vibration absorbing material via a soft foam layer. Note that this integral molding was performed using an upper mold and a lower mold. Further, the method for manufacturing the vibration absorbing material is described in the 11th
As shown in the figure, a plurality of container-shaped members are formed, sand is injected into the container-shaped members, and molten resin is pressed into the opening of the container-shaped members with a rotating roller. A lid member is adhesively formed on the upper end surface of the side wall of the shaped member.

Example 2 The vibration damping floor carpet for an automobile according to this example is composed of a carpet 1, a soft polyurethane foam layer 21, and a vibration absorbing material 31, as shown in FIGS. 4 and 5. This is similar to that of the first embodiment. However, in the first embodiment,
The difference is that the size of the cell body is changed to match the unevenness of the car floor so that it comes into close contact with the car floor. The manufacturing method of the vibration-damping floor carpet for automobiles of this embodiment is the same as that of the first embodiment.

Example 3 The vibration damping floor carpet for automobiles of this example is as follows:
As shown in FIG. 7, which is a partial cross-sectional view, a carpet 1, a soft polyurethane foam layer 22,
It is composed of a vibration absorbing material 32. The automobile vibration damping floor carpet of this example is basically the same as that of Example 1, except that (1) the vibration absorbing material 32 is partially exposed on the back surface of the soft polyurethane foam layer 22; and (2) the difference is that a container-shaped cell member is used as the cell body, and the upper surface of the cell body is a soft foam layer.

The vibration-damping floor carpet for automobiles is made by forming a 0.1 mm polyvinyl chloride film into the shape of the automobile floor, and filling the recesses with sand 32B to form a vibration-absorbing material. As shown in the figure, polyurethane is injected and foamed between the surface of the sand, the surface of the convex part of the container-shaped member, and the carpet 1,
The vibration absorbing material was integrated as a floor carpet.

Example 4 The vibration damping floor carpet for automobiles of this example is as follows:
The composition of the carpet, the soft polyurethane foam layer, and the vibration absorbing material is the same as in Example 1, but as shown in FIG. The difference is that closed cells 33 are used, a plurality of the closed cells 33 are spread on the floor of the automobile, polyurethane is injected and foamed, and the vibration absorbing material is integrated as a floor carpet.

Effects of Examples 1 to 4 The vibration damping floor carpets for automobiles in Examples 1 to 4 described above all have the following effects.

First, since inorganic granules are used as the vibration absorbing material, it is sufficient to simply contact the vibration absorbing material with the floor surface without adhering it, and it is also easy to increase the adhesion, so the vibration damping effect is large. . Second, since the carpet and vibration absorbing material are integrated by polyurethane injection foaming, the adhesion is extremely high and the vibration damping effect is great. 3
First, because it has a large vibration damping effect, it requires less vibration absorbing material and is lighter than conventional vibration damping materials. Fourth, since inorganic particles are used as the vibration absorbing material, the vibration damping effect is large over a wide temperature range, and the effect is also large against minute vibration noise.

It should be noted that the vibration damping floor carpet for automobiles of Example 1 is easy to manufacture as a vibration absorbing material and is excellent in light weight. In the case of Example 2, by changing the size of the cell body of the vibration absorbing material, the vibration absorbing material can be brought into close contact with the shape of the floor surface of the automobile, and the vibration absorbing effect is also more excellent. In the case of Example 3, the vibration absorbing material can be manufactured more easily. Regarding the fourth embodiment, there is a large degree of freedom in the arrangement of the vibration absorbing material.

[Effects of the invention] In this vibration damping floor carpet for automobiles, the vibration absorbing material containing inorganic particles is integrated into the carpet, so unlike conventional damping materials such as asphalt sheets, it adheres to the floor surface. No process is necessary; just contact is sufficient. Therefore, in the vibration damping floor carpet for an automobile, the step of adhering the vibration absorbing material to the floor surface of the automobile can be omitted, and the manufacturing process can be simplified.

In addition, this vibration-damping floor carpet for automobiles uses a vibration-absorbing material containing inorganic particles, so
Even when the floor surface has a very complicated shape, it is easy to bring the vibration absorbing material into close contact with the entire surface of the floor surface. Furthermore, since the carpet and the vibration absorbing material are integrated by polyurethane injection foaming, the vibration absorbing material can be easily attached to the floor surface of the automobile. Therefore, this vibration damping floor carpet for automobiles has a greater vibration damping effect than the conventional one.

Furthermore, since the present vibration-damping floor carpet for automobiles uses a vibration-absorbing material with a large damping effect, the weight of the vibration-damping material used can be reduced compared to the case of asphalt sheets or the like. Therefore, the vibration-damping floor carpet for automobiles is excellent in light weight.

Since the vibration-absorbing material of this vibration-damping floor carpet for automobiles is made of inorganic granular materials, this vibration-damping floor carpet for automobiles contributes significantly to the noise inside the car compared to the case where conventional asphalt sheets are used.
Great vibration damping effect in the frequency band of 100-1000Hz.
Furthermore, for the same reason, the vibration damping floor carpet for automobiles has a small temperature characteristic and has a damping effect over a wide temperature range.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a vibration-damping floor carpet for an automobile according to the first embodiment. FIG. 2 is a cross-sectional view of the damping floor carpet for an automobile according to the first embodiment shown in FIG. 1, taken along the line A--A. Third
This figure is a partially enlarged sectional view of the vibration damping floor carpet for an automobile according to the first embodiment shown in FIG. 2.
FIG. 4 is a cross-sectional view of a damping floor carpet for an automobile according to a second embodiment. FIG. 5 is a partially enlarged sectional view of the damping floor carpet for an automobile according to the second embodiment shown in FIG. 4. FIG. 6 is a perspective view of the state after the recessed portion of the container-shaped cell member is filled with inorganic particles in Example 3. FIG. 7 is a partial cross-sectional view of a vibration-damping floor carpet for an automobile according to a third embodiment. FIG. 8 is a perspective view showing a cross-sectional state of a part of the vibration-damping floor carpet for an automobile according to the fourth embodiment. FIG. 9 is a perspective view of a vibration absorbing material whose cell bodies have a substantially cubic shape. FIG. 10 is a perspective view of a vibration absorbing material whose cell bodies are in the shape of a rectangular parallelepiped. FIG. 11 is an explanatory sectional view of one embodiment of sealing the cell body. FIG. 12 is an explanatory sectional view of another embodiment of sealing the cell body. FIG. 13 is a perspective view of a conventional floor carpet for an automobile. 14th
The figure is a cross section taken along the line B-B of the conventional automobile floor carpet shown in FIG. 13, and a vibration damping material adhesively placed on the automobile floor below the floor carpet. It is a diagram. FIG. 15 is a partially enlarged sectional view of the automobile floor carpet and vibration damping material shown in FIG. 14. DESCRIPTION OF SYMBOLS 1... Carpet, 2... Foam layer, 3... Vibration absorbing material, 3A... Cell body, 3B... Inorganic particulate material, 6
... Felt (sound absorbing material), 7... Asphalt sheet (vibration damping material).

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A carpet, a foam layer integrally formed on the back surface of the carpet and having a back surface shape that roughly follows the shape of the floor surface of an automobile, and a foam layer on the back surface of the foam layer. A vibration damping floor for an automobile, comprising a plurality of cell bodies held and exposed on the back surface of the foam layer, and a vibration absorbing material made of inorganic granules held within the cell bodies. Carpet. (2) The vibration-damping floor carpet for an automobile according to claim 1, wherein most of the back surface of the foam layer is covered with a vibration-absorbing material. (3) The vibration-damping floor carpet for an automobile according to claim 1, wherein the plurality of cell bodies are arranged in a sheet shape and connected to each other in a planar manner. (4) The vibration-damping floor carpet for an automobile according to claim 1, wherein the foam layer is made of flexible polyurethane foam. (5) The vibration-damping floor carpet for an automobile according to claim 1, wherein an adhesive layer is formed on the back side of the vibration-absorbing material.