JPH05254429A - Underframe for railway vehicle - Google Patents

Abstract

PURPOSE:To enable weight reduction, lowering of the center of gravity, and reduction of the cost of a vehicle to be realized by providing cross beams that double as a floor joist in a direction nearly at a right angle to the longitudinal direction of the body of the vehicle above the floor board of an underframe constructed between side beams. CONSTITUTION:Taking the case of a vehicle made of aluminum alloy, cross beams 1 are welded and connected in the direction of a railway sleeper, namely, in a direction nearly at a right angle to the longitudinal direction (A) of the body of the vehicle on a truss-shaped floor board 2 of an underframe made up of aluminum hollow shapes, and between side beams 3, 5 on both sides, and cross beams 1 support an upper floor board 4 and floor load, in other words, cross beams 1 possess the function of floor joists, and these floor joists are floor supports and/or seat supports.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underframe of a railway vehicle having a double floor structure in order to ensure heat insulation and sound insulation.

[0002]

2. Description of the Related Art Conventional underframes for railway vehicles generally have a single floor structure, of which two typical types are listed. One of them is an example of a steel vehicle (including a stainless steel vehicle), and as shown in FIG. 2, an underframe which is a corrugated plate in the longitudinal direction of the vehicle body (indicated by arrow A in the figure). A cross beam b in the sleeper direction, that is, a direction substantially orthogonal to the longitudinal direction A of the vehicle body is arranged below the floor board a, and a floor padding c and a floor finish material d are formed above the underframe floor board a. The side beams e, e are attached to both sides of the underframe floor board a.

The other type is an example of an aluminum alloy vehicle. As shown in FIG. 3, an aluminum alloy floor hollow member g having a truss-shaped inner wall f is arranged in the longitudinal direction A of the vehicle body. , A structure in which side beams h are attached to both sides, a horizontal beam i is arranged below the floor hollow profile g in a direction substantially orthogonal to the longitudinal direction A of the vehicle body, and above the floor hollow profile g. In the case of the floor finishing material j, the horizontal beam i may be omitted, but it is practically difficult to omit it because of insufficient rigidity against an airtight load and a heavy underfloor equipment load.

These single floor structures have the advantage of being simple in structure, but have the drawback of being poor in heat insulation and sound insulation. Therefore, in a high-speed vehicle, the cross-sectional characteristics and sound insulation characteristics of the floor structure are improved. In many cases, a double floor structure with an air layer in the middle is adopted.

Of the double floor structure, the lower floor plate is an underframe floor plate k, and there are an example of a corrugated plate structure and an example of an aluminum hollow profile member as in the case of a single floor structure. FIG. 4 shows an example of a hollow aluminum material, in which an upper floor plate 1 is made of an aluminum plate or a sun gerench panel, and a heat insulating material (not shown) is packed between the upper and lower floor plates k and l. An air layer m is formed. Further, floor joists n are arranged to provide equipment such as an upper floor board 1 and a stool. This floor joist n is a stool
It may also be the name of floor support. In addition, o is a lateral beam and p and p are side beams.

The double-floor structure is superior to the single-floor structure in terms of heat insulation and sound insulation, but the weight and the cost are increased by at least the floor joist n, and the floor by the air layer m. Inevitably, the thickness increases and the center of gravity of the car body rises. Further, the floor joists n welded to the lower underframe floor board k are arranged corresponding to the positions of the equipment such as the allocation of the upper floor board l and the seating, and the direction is not always constant. In addition, the front joist n only supports the upper floor plate 1 and the floor load, and does not contribute to the rigidity against the equipment load or the airtight load.

[0007]

The present invention is intended to solve the problems of increased weight, high cost, and high center of gravity (top heavy) in a double floor structure.

[0008]

That is, the present invention is
An underframe for a rail vehicle is characterized by arranging a horizontal beam also serving as a floor joist in a direction substantially orthogonal to the longitudinal direction of the vehicle body on the upper side of an underframe floor plate configured between side beams. Actually, the floor joists are at least one of a floor support and a stool support.

[0009]

In the above-mentioned structure, the cross beam in the sleeper direction, which is formed on the lower side of the conventional underframe floor plate, is moved to the upper side of the underframe floor plate, and the conventional floor joists are abolished. In addition to reducing the weight of the vehicle and reducing the cost, the total thickness of the floor structure is reduced to achieve a low center of gravity of the vehicle.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the embodiment shown in FIG. This figure shows an example of a vehicle made of aluminum alloy, in which the cross beam 1 is on a truss-like underframe floor plate 2 made of an aluminum hollow frame, and between the side beams 3 and 3 on both sides, the sleeper direction, that is, the longitudinal direction of the vehicle body. It is welded and joined in a direction substantially orthogonal to A. Further, the horizontal beam 1 supports the upper floor plate 4 and a floor load. In other words, the horizontal beam 1 also has a function of a floor joist, and this floor joist is a floor support and / or a pedestal support.

FIG. 1 illustrates the application of the present invention to an aluminum alloy vehicle in which the underframe floor plate 2 is made of an aluminum hollow mold member. However, in a steel vehicle (including a stainless steel vehicle), The underframe floor plate 2 may be a corrugated plate system as shown in FIG.

[0012]

As described above, the present invention relates to an underframe of a railway vehicle having a double floor structure, in which a horizontal beam is arranged at a position of a conventional floor joist, and this lateral beam also serves as the floor joist. As a result, it is possible to reduce the weight of the vehicle, reduce the center of gravity, and reduce the cost, while ensuring the heat insulation and the sound insulation.

[Brief description of drawings]

FIG. 1 is a perspective view showing a partial cutaway of a main part of an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of an example of a conventional underframe having a single floor structure.

FIG. 3 is a perspective view of a main part of another example of a conventional underframe having a single floor structure.

FIG. 4 is a perspective view of a main part of an example of a conventional underframe having a double floor structure.

[Explanation of symbols]

 1 Horizontal beam 2 Frame frame 3 Side beam 4 Upper floor

Claims (2)

[Claims] 1. An underframe for a railway vehicle, characterized in that a horizontal beam also serving as a floor joist is arranged in a direction substantially orthogonal to a longitudinal direction of a vehicle body on an upper side of an underframe floor plate formed between side beams. 2. The underframe for a rail vehicle according to claim 1, wherein the floor joists are at least one of a floor support and a stool support.