JPH09254786A - Vehicle body for railway rolling stock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently produce an underframe constructed of a plurality of sections by forming an extruded section into a plane, whose upper face continues to the upper face of a hollow extruded section, and extending the lower face of the hollow extruded section to the position facing the side face of a connector. SOLUTION: A floor member 1 constructed of a light alloy hollow extruded section is arranged along the longitudinal direction of a vehicle body, while both of the upper face and the lower face of the floor member 1 are welded so as to be connected together, and five pieces of the floor members 1 are connected so as to constitute an underframe. The upper face of the floor member 1 is formed into a plane continuing to the upper faces of side sills 2 constructed of hollow extruded sections, a bolster 3 is connected to the lower face of each floor member 1, a center sill 6 is arranged between the bolster 3 and an end beam 4, a connector is installed in the center sill 6, and the lower face of each floor member 1 is extended to the position facing the side face of the connector. In this way, the underframe constructed of a plurality of sections can be produced efficiently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body of a railway vehicle, and more particularly to a vehicle body of a railway vehicle suitable for being made of a light alloy mold material.

[0002]

2. Description of the Related Art In recent years, extrudability, corrosion resistance,
Aluminum materials with excellent weldability have been developed. Along with this, in terms of weight reduction and rationalization of production, railcars are now the mainstream of vehicle bodies that make effective use of these large shapes. In particular, the underframe structure is required to bear a large compressive load at the vehicle end, and a structure in which a hollow extruded mold material, which is advantageous in strength, is used as a floor member has been widely adopted. As such a structure, for example, an aluminum alloy and weight reduction of a vehicle (published by the Japan Aluminum Federation in 1990), and the vehicle body structure described on pages 308, 320 to 368 can be mentioned.

At both ends of the underframe structure, a coupler for connecting the vehicles to each other, a center beam for mounting them and a bolster member for connecting the truck and the vehicle body are required.

Since very strong loads act on these members in terms of strength, it is not possible to bear these large loads only with the hollow extruded mold material forming the floor member of the underframe structure.

Therefore, a structure is adopted in which a middle beam and a bolster are combined with the vehicle end portion of an underframe which constitutes a floor member of a hollow extruded mold member to secure rigidity and strength.

As an example of these vehicle body structures,
As described in Japanese Patent No. 56929, one having a structure in which a middle beam is welded and bonded to a lower surface plate of a hollow extruded die member can be mentioned. In addition, as a structural example in which a pillow beam is joined to the lower surface of the hollow extruded shape member, the aluminum alloy and the vehicle are reduced in weight,
The structure structure described on page 308 is mentioned.

[0007]

The structure of the floor member of the underframe structure made of the hollow extruded member as in the above-mentioned conventional example has the following problems.

(1) The center beam attached to the lower surface of the hollow extruded mold member is orthogonal to and connected to the pillow beam on the center side (longitudinal direction) of the vehicle body. Therefore, if the height of the center beam becomes higher than necessary, the height of the pillow beam also becomes large.

Since this bolster straddles the entire length in the width direction of the vehicle body, the dimension (height) of this member plays an important role in securing a space under the floor. That is, since fitting members such as pipes and wirings are provided under the floor over substantially the entire length of the vehicle body, the height of the bolster crossing these members has a great influence in determining the underfloor space.

(2) In the above-mentioned mid-beam structure, the load (compressed end load) flowing into the mid-beam through the coupler can be transmitted to both side surfaces (side beams and side structures) of the vehicle body as quickly and smoothly as possible. difficult.

An object of the present invention is to provide a vehicle body of a railway vehicle in which the heights of a center beam and a bolster, which are dominant members in determining this space in order to secure a space under the floor, are minimized. It is in.

Another object of the present invention is to provide a method for producing an underframe which can efficiently produce an underframe composed of a plurality of mold members.

[0013]

The above object is to provide a vehicle body of a railway vehicle having an underframe made of a hollow extruded member, within a width range surrounded by left and right center beams of the underframe, and In the longitudinal direction of the vehicle body, the range from the vehicle end to the end portion on the vehicle body center side of the bolster is formed by an extrusion mold member joined to the hollow extrusion mold member, and the upper surface of the extrusion mold member is the upper surface of the hollow extrusion mold member. This is achieved by forming a continuous plane with respect to and the extruded mold member having its lower surface extended to a position facing the side surface of the coupler.

Another object of the present invention is to join a plurality of hollow extruded mold members arranged along the longitudinal direction of the vehicle body side by side in the width direction of the vehicle body and to join them, and a plurality of extruded members arranged on the vehicle end side of the cross beam. This is achieved by a manufacturing method including a step of joining mold materials and a step of joining the hollow extruded mold material and the extruded mold material.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a plan view showing a structure of an underframe in a vehicle body of a railway vehicle to which the present invention is applied. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is line B- in FIG.
It is a B section sectional view. FIG. 4 is a sectional view taken along line CC in FIG. FIG. 5 is an enlarged cross-sectional view of a portion showing the structure of the center beam of FIG. In the figure, the floor member 1 is composed of a hollow extruded mold material made of a light alloy, and the floor member 1 is arranged along the longitudinal direction of the vehicle body. A plurality of floor members 1 are arranged in the width direction of the vehicle body and are joined by welding. The floor members 1 are joined to each other by welding the upper surface and the lower surface, that is, both surfaces of the floor member 1.
The plurality of floor members 1, that is, five floor members 1 in the case of this embodiment are joined to form an underframe. Side beams 2 are arranged at both ends of the floor members 1 in the vehicle body width direction along the vehicle body longitudinal direction. Each side beam 2 is made of a hollow extruded mold material made of light alloy, and has a vertical dimension longer than that of the floor member 1. On the lower surface of the five floor members 1,
The bolster 3 is joined. The bolster 3 is installed at a position supported by a bogie of an underframe constituted by the five floor members 1. At both ends of the pillow beam 3,
An air spring bridge 5 is configured. End beams 4 are installed at the longitudinal ends of the plurality of floor members 1. The end beam 4 is made of a light alloy extruded shape member and is arranged along the vehicle body width direction.

The center beam 6 is installed between the end beam 4 and the pillow beam 3. A connector is attached to the center beam 6 and is connected to an adjacent vehicle by the connector. An end portion of the center beam 6 on the vehicle body center side (in the vehicle body longitudinal direction) is coupled to the pillow beam 3.

The load acting on the bolster 3 will be considered individually. The bolster 3 is supported at the position of an air spring, and the weight of the vehicle body is added by passing through side structures on both side surfaces.

FIG. 6 (a) shows a distribution of bending moments acting on the bolster 3 (bending moments acting on the outboard of the bolster) when the above-mentioned load is applied.

Next, the vehicle end load acting via the coupler provided on the center beam 6 is partially applied to the floor member 1, and the rest is applied to the pillow beam connected at the end of the center beam. Transmitted. FIG.
(B) shows a bending moment distribution acting on the bolster (a bending moment acting on the surface of the bolster) when this load is applied.

The size (height and width) of the bolster 3 is determined by suppressing the maximum stress due to the combination of stresses generated by the moment between the above-mentioned intervals within an allowable value. Especially,
The larger the vehicle end load is, the larger the size of the bolster is, the larger the influence of the latter stress.

In the present invention, as shown in FIGS. 1 and 2, on the vehicle end side including the bolster 3, the range in which the middle beam of the floor member 1 made of the hollow extruded shape member is attached (in the shaded portion of FIG. 1). (Corresponding member) is constituted by a member separate from the hollow extrusion mold material. FIG. 5 shows the detailed structure of this member. The center beam 6 is formed of a mold material integrally molded up to the position of the upper surface of the floor member 1. The center beam 6 may have a structure in which mold members are divided as shown in FIG. 5 or a structure in which these are integrally molded.

The following structure is adopted so that the separate member shown in FIG. 5 (a member corresponding to the hatched portion in FIG. 1) and a general floor member (hollow extrusion mold member) can be easily combined. That is, at the position where the separate member and the general floor member are joined,
The width of the lower plate 8 corresponding to the floor member of the outer member is set to the upper plate 8 '.
Shorter than the width of. With this structure, in the example of FIG. 5, the separate member is assembled in advance, the integrated separate member is inserted into the floor member from above, and the two are welded together to form an underframe structure. .

In the middle beam structure portion (hatched portion) shown in FIG. 1, the portion overlapping the pillow beam 3 is the floor member portion (floor member thickness to be a hollow structure portion) of the members shown in FIG. (A range corresponding to the height) is left, and the member protruding below is scraped off for use. Two flanges 7 are provided on the structure portion of the middle beam 6 which projects downward from the portion corresponding to the floor member.
And 7'are provided.

The center beam generally has the highest height at the position where the coupler is attached, and the height decreases as it approaches the cross beam. The flange 7'of the center beam 6 indicates the highest position of the center beam.

In the present invention, in order to facilitate the processing of the center beam, the upper and lower parts of the flange 7 are machined so that the height of the center beam can be changed in the longitudinal direction of the vehicle body. . The coupler is attached to the mid-beam structure at a position most protruding (tall, that is, having a long vertical dimension) from the floor member.

By adopting this structure, when a vehicle end load is applied to the center beam, the load flowing into the center beam is relatively smoothly transmitted to the floor member located on the upper side. If the vehicle end load easily flows into the floor member (without requiring a distance in the longitudinal direction of the vehicle body), the load of the structure portion of the center beam projecting below the floor member is reduced, so that this structure portion is reduced. The load acting on the bolster connected with is also small.

From the above, as shown in FIG. 6B, the bending moment acting on the bolster is reduced, and the height of the bolster can be minimized.

According to this embodiment, the two flanges are provided in the structure portion projecting downward from the thickness of the floor member of the center beam,
By changing the height between both flanges by machining, there is an effect that it is possible to provide a lightweight middle beam structure having an arbitrary height in the longitudinal direction of the vehicle body.

According to the underframe structure of the above-described embodiment, the height of the bolster, which is dominant in securing the underfloor space in the longitudinal direction of the vehicle body of the underframe, is minimized so that the underframe is arranged in the longitudinal direction of the vehicle body. A space for fitting pipes, wiring, etc. to be installed can be secured, and the work of fitting under the floor is greatly improved. In addition, since the structure of the middle beam structure composed of a member different from the general floor member can be assembled in advance, it becomes easy to manufacture the middle beam structure part having a complicated structure, and the pillow beam is complicated to be rigged. There is no need to process it, and it is very effective in terms of streamlining production.

Further, since the center beam and the floor member are formed of an integral extruded shape member, the center beam member is made into a base material, and the strength is improved by eliminating the welded joint, so that the weight of the center beam is reduced. be able to.

[0031]

As described above, according to the present invention, a middle beam structure having an upper surface continuous with a floor member is formed of an extruded mold material, which is dominant in securing a sufficient underfloor space. It is possible to suppress the height of the center beam and the bolster, which are the members, to the minimum size.

Further, since the center beam structure portion can be assembled independently of the floor member, the workability of underframe production can be improved.

[Brief description of drawings]

FIG. 1 is a plan view showing an underframe portion of an embodiment of a vehicle body of a railway vehicle according to the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

3 is a sectional view taken along line BB in FIG.

FIG. 4 is a cross-sectional view taken along the line CC of FIG.

5 is an enlarged cross-sectional view of the center beam shown in part a of FIG.

FIG. 6 is a moment distribution diagram showing a distribution state of bending moments of a vertical load acting on a pillow beam of an underframe.

FIG. 7 is a moment distribution diagram showing a distribution state of bending moments of a vehicle end load acting on a bolster of an underframe.

[Explanation of symbols]

1 ... Floor member, 2 ... Side beam, 3 ... Pillar beam, 4 ... End beam, 5 ... Air spring support, 6 ... Middle beam.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Tomonari Shimomatsu, Yamaguchi Prefecture Higashi-Toyoi 794 Address Higashi-Toyoi Ltd. (72) Inventor Kentaro Masai Kudamatsu City, Yamaguchi Prefecture Higashi-Toyoi 794 Stock Hitachi, Ltd., Kasado Plant (72) Inventor, Seijiro Totori, Higashi-Toyoi, Higashitoyoi, Kudamatsu City, Yamaguchi Prefecture Stock Company, Hitachi, Ltd., Kasado Plant

Claims (4)

[Claims] 1. In a car body of a railway vehicle having an underframe composed of a hollow extruded shape member, a pillow is provided from a car end in a width range surrounded by left and right center beams of the underframe and in a longitudinal direction of the car body. The range up to the end of the beam on the center side of the vehicle body is configured by an extrusion mold member joined to the hollow extrusion mold member, and the upper surface of the extrusion mold member forms a continuous plane with the upper surface of the hollow extrusion mold member. The extruded shape member is configured so that the lower surface thereof extends to a position facing the side surface of the coupler, and the vehicle body of a railway vehicle. 2. The vehicle body of the railway vehicle according to claim 1,
A vehicle body of a railway vehicle, wherein an end portion of the extruded shape member on the vehicle body center side in the vehicle body longitudinal direction is joined to a bolster. 3. A vehicle body of the railway vehicle according to claim 1,
The extruded profile is a vehicle body of a railway vehicle, wherein a portion corresponding to a floor member and a center beam is integrally formed. 4. A step of arranging and joining a plurality of hollow extruded mold members arranged along the longitudinal direction of the vehicle body in the width direction of the car body, and a step of joining a plurality of extruded mold members arranged on the vehicle end side of the bolster. A method of manufacturing an underframe, which comprises a step of joining the hollow extruded mold material and the extruded mold material.