JPH0796835A - Underframe structure for railroad rolling stock - Google Patents

Abstract

PURPOSE:To enhance pressure resisting strength and reliability in strength by using a brazing aluminium allay laminated panel capable of weld joining as a floor plate material of an underframe, and arranging a core material rigidity reinforcing member inside of a core material in a joining part of this core material and a lateral beam. CONSTITUTION:In an underframe structure where a floor plate 7 composed of a laminated panel is spread all over an upper surface of a lateral beam 5 between bolsters among an overall length of an underframe, the laminated panel is constituted by joining members integrally together by brazing by interposing a core material and a joining member arranged in the outer peripheral part between surface materials integrally formed of two sheets. Thin pipes 14 being a rigidity reinforcing material are arranged inside of a honeycomb-shaped core material 12 in a part where the floor plate 7 and the lateral beam 5 come into contact with each other, and thes thin pipes 14, and the core material 12 are joined together by interposing a blazing material or an adhesive 16 between both. The lateral beam 5 and the laminated panel are joined together by brazing one surfaces of thin pipes 15 to reinforce rigidity of the core material 12 swelling out from a flange width of the lateral beam 5 to a flange end part of the lateral beam 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a railcar underframe structure, and more particularly to a railcar underframe structure suitable for a vehicle traveling at high speed.

[0002]

2. Description of the Related Art In a conventional railway vehicle, an underframe is composed of a lateral beam in which end beams and side beams are connected like a ladder and a pillow beam for a bogie mounting portion. A corrugated plate, which generally forms a floor plate, is provided in the longitudinal direction on the upper surface of the underframe. A vertical load consisting of an impact load and a fitting load in the front-rear direction, a dead load such as underfloor equipment, and a passenger load acts on the underframe via a connecting device.
Examples of this structure include, for example, Mechanical Engineering Handbook, 15th edition,
79 to 80 (Japan Society of Mechanical Engineers (1977)). Also, as an example of an aluminum body,
Aluminum alloys and vehicle weight reduction, general, pp. 46-4
8 (edited by the Institute of Industrial Science (1990)).

In this structure, a part of the impact load from the vehicle end (load when the vehicle is connected) and a vertical load act on the floor plate between the cross beams of the underframe (the central portion of the vehicle body). However, in recent vehicles, there is a marked trend toward higher speeds, and the load conditions applied to the structure are becoming more and more stringent with it. Especially for vehicles that require high airtightness,
The structure must have a high pressure resistance, and the conventional floorboard structure will be severe in terms of strength. Furthermore, a lightweight structure is required in order to achieve higher speeds.

[0004]

DISCLOSURE OF THE INVENTION With the increase in speed of vehicles,
The difference in variation in atmospheric pressure inside and outside the vehicle body (which occurs when vehicles pass each other in a tunnel) becomes large. Therefore, in a vehicle that is required to have the above-mentioned pressure resistance performance, it is necessary to secure sufficient strength, and in order to improve the strength of the floor board, it is necessary to reduce the lateral beam interval and also increase the rigidity of the floor board. Therefore, there is a problem that the weight reduction of the vehicle body is prevented.

As one means for improving the rigidity of the floor plate, it is conceivable to apply a lightweight and highly rigid honeycomb plate to the floor plate. In this case, how to rationally connect the honeycomb floor plate and the horizontal beam becomes a problem.

An object of the present invention is to provide a railcar underframe structure having sufficient pressure resistance and high strength reliability.

Another object of the present invention is to:
It is an object of the present invention to provide a laminated panel formed by a relatively thin plate material, in which an additive to be installed on the panel surface can be installed without locally concentrating the load.

[0008]

The above object is to use a brazed aluminum alloy laminated panel capable of welded joint as a floor board material of an underframe, and stiffen the core material at the joint portion of the core member and the cross beam. This is achieved by arranging the member to be disposed inside the core material.

The above and other objects can be achieved by arranging the stiffening member in the opening portion of the core member so as to be joined to the position where the appendage is installed.

[0010]

When the pressure load is applied to the vehicle body, the pressure load is applied to the floor plate on the underframe surface, and a supporting reaction force is generated between the lateral beam and the side beams supporting the floor plate. Therefore, the floor plate receives a linear load from the horizontal beam at its contact surface. on the other hand,
The laminated panel is characterized by high out-of-plane bending rigidity and light weight, but the face plate and the core material that compose the panel are made of extremely thin materials, and especially the core material is 0.
It is an ultra-thin plate of about 1 to 0.2 mm. When a local compressive load from outside the surface acts on such a laminated panel, a large compressive stress is generated in the core material that supports this load. If this value exceeds the buckling limit value of the core material, the core material It is plastically deformed and crushes depending on the magnitude of the compressive load.

In the present invention, a stiffening material is attached inside the core material of the laminated panel to improve the buckling strength of the laminated panel to which the local load acts, in the range where the floor panel made of the laminated panel and the cross beam contact each other. It has a different structure. Further, even when an additive is installed on the laminated panel, a stiffening material is jointly arranged inside the core material corresponding to the installation position of the additive, and the load acting from the additive is dispersed by the stiffening material. Let me
It improves the buckling strength of the laminated panel.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a plan view of an underframe according to an embodiment of the present invention as viewed from above. In the figure, 1 is an underframe, 2 is an end beam, 3 is a side beam, 4 is a pillow beam that is connected to a bogie, 5 is a lateral beam that connects between the side beams 3, and 6 is a load that directly receives the connection. Beams 7 are floor boards. In this structure, a floor plate 7 composed of a laminated panel is spread over the entire surface of the underframe between the pillow beams 4 in the entire length of the underframe.

Next, the connecting structure of the floor plate 7 and the horizontal beam 5 will be described. FIG. 2 is an enlarged view showing the detailed structure of the portion A of FIG. 3 shows a stiffening structure of the core material in the laminated panel, FIG. 4 shows an aa cross section of FIG. 2, and FIG. 5 shows a bb cross section of FIG.

FIG. 2 shows a floor board 7 and a transverse beam 5 which are laminated panels.
FIG. 3 is a plan view showing the joint structure part of FIG. In the laminated panel, a core material and a joining member are arranged between two pairs of surface materials, the joining member is arranged on an outer peripheral portion of the core material, and these are joined by brazing. A thin-walled tube 14 serving as a stiffening material is disposed inside the honeycomb-shaped core material 12 at a portion where the floor plate 7 and the horizontal beam 5 are in contact (overlapped). As shown in FIG. 3, the thin-walled tube 14 for stiffening the core material 12 and the core material 12 are joined by inserting a brazing material or an adhesive 16 between the two so as to restrain out-of-plane deformation. This thin-walled tube 14
Is appropriately determined depending on the magnitude of the load acting on the floor plate 7. Similarly, the number of thin-walled tubes 14 that stiffen the core material 12 may be changed depending on the magnitude of the load. The width for stiffening the core material 12 is about 1 to 2 cells (one cell in FIG. 2) on one side of the flange width of the cross beam 5.

Regarding the connection between the horizontal beam 5 and the laminated panel, as shown in FIG. 4, a portion in which one surface of the thin-walled tube 15 for stiffening the core material 12 protruding from the flange width of the horizontal beam 5 is projected from the surface material of the laminated panel. 15 'and the flange end of the cross beam 5. When the thin pipe 15 partially contacts the flange width of the cross beam 5 (as in FIG. 2), a part of one side of the protruding portion 15 ′ is plastically worked to form this part and the flange of the cross beam 5. The welded portion 17 is formed so as to be connected.

Next, the operation of the coupling section will be described. Among the loads acting on the vehicle body, the vertically evenly distributed load on the floor plate 7 of the underframe 1 and the pressure load due to the difference in atmospheric pressure variation between the inside and outside pressures of the vehicle body are severe in terms of strength. In particular, the latter load greatly affects the structure of the relevant part.

Now, consider the case where the internal pressure acts on the floor plate 7. When the internal pressure is applied to the floor plate 7, the floor plate 7 changes between the lateral beams 5 out of the plane. Now, considering the floor plate, the floor plate 7 applies a kind of concentrated load (in this case, a linear load) from the flange surface of the horizontal beam 5 (the contact surface between the floor plate and the horizontal beam) as a supporting reaction force from the horizontal beam 5. receive. Therefore, the floor plate 7 receives a large compressive load from the outside on the contact surface.

In the present invention, as described above, the honeycomb core material 12 is stiffened by the thin tube 14 at the contact portion with the horizontal beam 5. By adopting such a structure, the floorboard 7 having higher pressure resistance than a general laminated panel
Can be Further, by applying the laminated panel to the floor board 7, it is possible to provide a vehicle body structure that is lighter in weight and has higher pressure resistance strength as compared with the conventional structure, and the strength reliability of the entire vehicle body is improved. There is also.

[0019]

According to the present invention, since a lightweight and highly rigid laminated panel can be applied as a floorboard, it is possible to provide a lightweight underframe having sufficient pressure resistance.

[Brief description of drawings]

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

FIG. 2 is a plan view showing a detailed structure of a portion A of FIG.

3 is a plan view showing an installation situation of a stiffening material installed in the core material of FIG. 2. FIG.

FIG. 4 is a sectional view taken along line aa of FIG.

5 is a sectional view taken along line bb of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Underframe, 3 ... Side beam, 5 ... Horizontal beam, 7 ... Floor plate, 11 ... Face plate, 12 ... Core material, 13 ... Edge material, 14, 15 ... Stiffening material,
15 '... Protrusions, 16 ... Joints, 17 ... Welding.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hitoshi Tsuruta 794, Higashitoyoi, Kudamatsu City, Yamaguchi Prefecture Stock company Hitachi Ltd. Kasado Plant

Claims (3)

[Claims] 1. A railway in which a connecting member is arranged around a core material, the core material and the connecting member are installed between a pair of surface materials, and the laminated panels joined by brazing are installed on an underframe. In a vehicle underframe structure, a horizontal beam forming an underframe is joined to a surface material of the laminated panel, and a stiffening member is joined and arranged in an opening portion of the core material so as to match a horizontal beam installation position of the laminated panel. An underframe structure for railway vehicles characterized by the following. 2. A metal surface material, a core material, and a connecting member, wherein the surface material is provided on both surfaces of the core material, and the connecting material is provided on the outer peripheral ends of the core material and the surface material. In a laminated panel in which these are arranged and joined by brazing, the stiffening member is placed inside the core material in the laminated panel in conformity with the installation position of an additive to be attached to the surface of the surface material from the outside of the laminated panel. A laminated panel characterized by being provided with. 3. The laminated panel according to claim 2, wherein the stiffening member has a structure in which at least a part of the stiffening member is projected to the outside of the surface material.