JPH07101334A - Floor structure for vehicle - Google Patents

Abstract

PURPOSE:To attain weight reduction and sound insulation performance by constituting first and second corrugated plates and first and second intermediate plates of light alloy. CONSTITUTION:An aluminium floor structure is formed as a composite material double structure where a bottom plate 1, an intermediate plate 3, an intermediate plate 4 and a top plate 7 are fixed to the obverse and the reverse of corrugated plates 2 and 6. A coincidence effect and resonance transmission can be shifted to a high frequency area by such double structure, and since an adhesive layer 5 is arranged in a boundary part of the double structure, a restrictive characteristic can be provided for the intermediate plates 3 and 4, and a vibration damping finction can be exhibited, and a transmission loss (sound insulation performance) is also enhanced. Of cource, the rigidity required as the floor structure is sufficiently provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a vehicle floor structure, and more particularly,
The present invention relates to a floor structure most suitable for vehicles that require noise prevention measures for vehicles such as the Shinkansen.

[0002]

2. Description of the Related Art In general, a floor of a railway vehicle is required to have not only rigidity and vibration damping property but also light weight and good sound insulation. As shown in FIG. 4C, the existing 300 series Shinkansen vehicle has an aluminum floor structure in which a honeycomb structure 32 is interposed between a bottom plate 30 and a top plate 31. Although the aluminum honeycomb structure has a characteristic of being lightweight, it is inferior in sound insulation and may cause a noise problem in the vehicle. Therefore, FIG.
As shown in (A), a floor structure made of a steel plate in which a reinforcing plate 22 is interposed between the bottom plate 20 and the top plate 21, or FIG.
As shown in (B), a heat insulating material 2 is provided inside by using a reinforcing plate 24.
The floor structure filled with 5 is partially adopted in the place where noise is likely to occur. The steel sheet floor structure (especially the latter) is excellent in sound insulation, but is heavy and not so preferable.

That is, at present, a floor structure suitable for the "Nozomi" type 300 series vehicle and excellent in sound insulation has not been obtained.

[0004]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a vehicle floor structure having a lightness equivalent to that of an aluminum honeycomb structure and having a sound insulation property equivalent to a steel plate structure. In order to achieve the above object, the floor structure according to the present invention has a structure in which a sandwich-shaped composite material in which flat plate members are fixed to the front and back of a corrugated plate member having a corrugated cross section is bonded in two stages via an adhesive layer. Consists of. The lower flat plate of the composite material constitutes the bottom plate, and the upper flat plate of the composite material constitutes the top plate. Although these materials are made of a light alloy such as aluminum, a stainless steel plate may be used for the bottom plate or the top plate for the purpose of reinforcing strength or improving fire resistance.

The composite material is excellent in strength and vibration damping property, and is lightweight. Further, as will be described with reference to data in Examples described later, it also has specifications that require sound insulation. In other words, according to the floor structure of the present invention, weight reduction and sound insulation can be achieved at the same time.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle floor structure according to the present invention will be described below with reference to the accompanying drawings. 1, a vehicle floor structure includes a bottom plate 1, a corrugated plate member 2 having a corrugated cross section,
The intermediate plates 3 and 4, an adhesive layer 5 interposed between the intermediate plates 3 and 4, a corrugated plate member 6 having a corrugated cross section, and a top plate 7. Is provided. These members 1, 2, 3, 4, 6, 6, 7 and 8 are all made of aluminum, the bottom plate 1 and the intermediate plate 3 are bonded to the front and back of the corrugated plate material 2, and the intermediate plate 4 and the top plate 7 are the corrugated plate material 6. It is glued to the front and back. A urethane resin adhesive is used for the adhesive layer 5, and is applied to the entire surfaces of the intermediate plates 3 and 4.

The floor structure having the above-mentioned structure is composed of the corrugated sheet material 2,
It has a double structure of a composite material in which a bottom plate 1 and an intermediate plate 3, and an intermediate plate 4 and a top plate 7 are fixed to the front and back surfaces of 6. With such a double structure, the coincidence effect and resonance transmission can be shifted to a high frequency range, and moreover, by providing the adhesive layer 5 at the boundary portion of the double structure, the intermediate plates 3 and 4 are restrained. In addition, the vibration damping function is demonstrated and the transmission loss (sound insulation) is improved. Of course, the rigidity required for the floor structure is sufficiently provided.

FIG. 2 shows a structure for attaching a seat to the floor structure. An unillustrated seat or floor-mounted device is mounted on the top plate 7 via the bracket 10. The bracket 10 is fixed on the top plate 7 by bolts 11, and the bolts 11 penetrate the top plate 7, the corrugated plate material 6 and the intermediate plate 4 and are coupled to the screw seat 12. That is, the bolt 11 penetrates the composite materials 7, 6, 4 in the upper stage, and its fixing strength is extremely high.

Specifically, a counterbore is formed in the corrugated sheet material 2 and the intermediate plate 3, and a screw seat 12 is provided in the counterbore. Alternatively, a counterbored hole may be formed only in the corrugated sheet material 2, and the screw seat 12 may be provided in the countersunk hole. Next, the sound insulation measurement data of this example will be shown in comparison with the conventional example.

[0010]

[Table 1]

The measurement data of Table 1 is, in the embodiment,
The bottom plate 1 has a thickness of 0.6 mm, and the intermediate plates 3 and 4 have a thickness of 0.
5 mm, the top plate 7 has a thickness of 1.2 mm, and the corrugated plate materials 3 and 4 are used.
Used a thickness of 0.5 mm, a height of 9.5 mm, a corrugated dimension b of 9.0 mm, and a dimension c of 14.5 mm. The total thickness is 21.8 mm. Conventional Example 1 is made of the steel plate shown in FIG. 4 (A), the bottom plate 20 has a thickness of 1.6 mm, and the top plate 21 has a thickness of 2.3 mm.
The reinforcing plate 22 has a thickness of 2.3 mm, and the total thickness d is 22 mm.

Conventional example 2 is made of a steel plate containing a heat insulating material as shown in FIG. 4 (B) and has the same specifications as conventional example 1. Conventional Example 3 has an aluminum honeycomb structure shown in FIG. 4C, the bottom plate 30 has a thickness of 0.6 mm, the top plate 31 has a thickness of 1.2 mm, and the honeycomb structure has a thickness of 1 / 4-15N. -5
A 2D one is used, and the total thickness d is 22 mm.

The transmission loss of each of the four types is as shown in Table 1. The transmission loss is the best in Conventional Example 2, followed by Example and Conventional Example 1. Conventional example 3
Is the lowest, which causes noise in the car. on the other hand,
Regarding the weight, the conventional example 3 is the lightest, but the example is considerably lighter than the conventional examples 1 and 2 (about 1/3).
It is done, and it does not pose a problem in practical use. That is, the embodiment has the lightness equivalent to that of the conventional example 3 having the aluminum honeycomb structure and the sound insulating property equivalent to that of the conventional examples 1 and 2 having the steel plate structure.

FIG. 3 shows sound insulation measurement data for a test car (300 series Shinkansen). Measurement is under vehicle and above floor 470
A microphone was installed in mm. The difference between the two measured values is the transmission loss. In FIG. 3, a characteristic curve α shown by a solid line is data of the embodiment, and a characteristic curve β shown by a dotted line is data of a combination of the conventional examples 1 and 2. As is clear from these data, the embodiment is slightly inferior in transmission loss (sound insulation) to the conventional example of the steel plate structure, but there is no difference in practical use, and the weight is reduced to about 1/3. It has the favorable advantage that

Regarding the sound insulation, in the embodiment, a better result than the above measurement data can be obtained by filling the gap between the corrugated sheet materials 2 and 6 with a sound absorbing material such as a foam material. The floor structure according to the present invention is not limited to the above embodiment, but can be variously modified within the scope of the gist. For example, the bottom plate 1 and the top plate 7 are not necessarily light alloys such as aluminum but may be stainless steel plates. Further, the pitch or corrugated shape (square shape, round shape) of the corrugated sheet materials 2, 6 and the plate thickness of various materials can be arbitrarily selected according to the required steel property and vibration damping performance.

Further, in the actual construction, the floor structure of the present invention and the conventional floor structure may be appropriately combined. Furthermore, although the above description has been described as a vehicle floor structure, the present invention is also useful as a floor structure for ships and other transportation means in which sound insulation, weight, and vibration damping are problems.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a floor structure according to the present invention.

FIG. 2 is a cross-sectional view showing a state in which a bracket is bolted to the top plate of the floor structure.

FIG. 3 is a graph showing the transmission loss (sound insulation) of the example and the conventional example.

FIG. 4 is a front view showing a conventional floor structure, (A) shows a steel plate structure, (B) shows a steel plate structure (including a heat insulating material), and (C) shows an aluminum honeycomb structure.

[Explanation of symbols]

 1 ... Bottom plate 2, 6 ... Corrugated sheet material 3, 4 ... Intermediate plate 5 ... Adhesive layer 7 ... Top plate

Front Page Continuation (72) Inventor Mikihiro Mizushima 1-9-1 Jokoji Temple, Amagasaki City, Hyogo Prefecture Osaka Fuji Industrial Co., Ltd.

Claims (2)

[Claims] 1. A bottom plate, a first corrugated plate material provided on the bottom plate and having a corrugated cross section, a first intermediate plate provided on the first corrugated plate material, and a first intermediate plate. A second intermediate plate provided on the second intermediate plate through an adhesive layer, a second corrugated plate material having a corrugated cross section provided on the second intermediate plate, and a top plate provided on the second corrugated plate material. A vehicle floor structure, characterized in that at least the first and second corrugated sheets and the first and second intermediate plates are made of a light alloy. 2. The vehicle floor structure according to claim 1, wherein the first and second corrugated members are installed in directions in which respective corrugations are orthogonal to each other.