JPH0457536B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an underframe structure for a railway vehicle, and particularly to an underframe structure for a railway vehicle suitable for passenger trains.

[Background of the invention]

Conventional underframes for railway vehicles are made by joining side beams and cross beams, and attaching a keystone to the top surface, as described in the document "Vehicle Technology" No. 159, August 1982, published by the Japan Railway Vehicle Manufacturers Association, page 29. It was made by laying plates as floorboards. Such an underframe structure will be explained with reference to FIGS. 9 to 11. In the figure, an underframe 1 includes side beams 2 arranged on both sides in the longitudinal direction of the vehicle body, cross beams 3 arranged in the width direction of the vehicle body between the side beams 2, end beams 6 provided at the end of the vehicle,
A frame consisting of a body support 5 provided at a position corresponding to the front and rear bogies near the car end, and a center beam 7 provided in the longitudinal direction of the vehicle body between the body support 5 and the end beam 6, and a frame provided on the upper surface of the frame. It consists of a keystone plate 4. In the underframe 1 having such a configuration, loads are applied by the weight of passengers on the floor, various accessories such as seats, and various electrical equipment under the floor, and most of the load is borne by the cross beams 3. support. For this reason, the cross beams 3 are generally arranged sequentially in the longitudinal direction of the vehicle body at a pitch of about 500 mm, and their cross-sectional shape is shown in FIG. It is rigid and has the height and cross-sectional area necessary for strength. Therefore,
The weight of the cross beam 3 itself is approximately 20% of the entire underframe 1, which has been a major obstacle in reducing the weight of the entire vehicle body. Furthermore, when installing a large number of devices such as various electrical devices and ducts under the floor, the horizontal beam 3
Because of the high height, the space for installing equipment is reduced, and the installation work of the various equipment is very complicated and requires upward work, which has disadvantages such as an increase in manufacturing man-hours. Furthermore, depending on the specifications of the car body, if insulation material with a thickness of several tens of millimeters is spread over the entire surface of the underframe 1 under the floor, the space under the floor will further decrease, making it more complicated, and the work required to climb upwards will also increase. Therefore, there was a drawback that the number of manufacturing steps was further increased.

[Purpose of the invention]

An object of the present invention is to provide an underframe structure for a railway vehicle in which the thickness, that is, the vertical height dimension is shortened, the underframe itself is made thin, and deformation due to welding heat input is reduced as much as possible. It is in.

The present invention provides side beams that are disposed on both sides of the underframe in the width direction so as to extend in the longitudinal direction of the vehicle body, and side beams that are disposed so as to extend in the width direction of the underframe in correspondence with the position where the bogie is installed between the side beams. a pillow beam having each end joined to the side beam;
An underframe structure for a railway vehicle comprising a cross beam that extends in the width direction of the underframe between the side beams and between each of the pillow beams and is disposed with each end joined to the side beam, wherein the cross beam is attached to itself. The cross-sectional shape in the width direction is rectangular, has an opening at the upper part, and has a box-shaped cross-section having a continuous plane part perpendicular to the upper plane on both sides, and each of the side beams has a The underframe has a flange portion on a side surface on the center side in the width direction of the underframe, on which an end of the cross beam is placed and supported, and the cross beam is placed between each of the side beams and between the pillow supports, and the cross beam is placed along the longitudinal direction of the vehicle body. The cross beams are arranged adjacent to each other in the direction and their respective side plane parts are joined to each other by spot welding, and each end of each cross beam is placed on the flange part of the side beam and joined by spot welding. It is something.

[Embodiments of the invention]

Hereinafter, one embodiment and other embodiments of the present invention will be described with reference to FIGS. 1 to 8. first,
An embodiment according to the present invention will be explained with reference to FIGS. 1 to 3. In the figure, the underframe 1 has side beams 9 arranged on both sides in the longitudinal direction of the vehicle body, end beams 6 provided at the ends, pillow beams 5 provided at positions corresponding to the front and rear bogies, and the end beams 6. A cross beam 8 having a box-shaped cross section as shown in FIG. 2 is installed between the front and rear pillow beams 5 of the frame structure in a frame structure consisting of a middle beam 7 provided in the longitudinal direction of the vehicle body between the pillow beam 5. It is constructed by sequentially arranging and joining in the width direction of the vehicle body.
The front and rear cross beams 8 are constructed by forming a thin plate into a box shape by plastic working, and are installed so as to connect the vertical flanges of the box structure, and a heat insulating material 10 is provided on the underframe 1. If necessary, it is placed inside the cross beam 8 as shown in FIG. On the other hand, the side beam 9 has a rib 9a for receiving the cross beam 8, as shown in FIG. It is formed by plastic working. Cross beam 8
and the side beam 9 are joined by mechanical connection such as spot welding or rivets.

According to such a configuration, the cross beam 8 has a box-shaped cross section, and has a flat part, that is, a flange part integrally molded on the upper surface thereof, and a continuous side part formed perpendicularly to the flat part. Since the flat parts, that is, the vertical flange parts, are joined to each other by adjacent cross beams, sufficient strength can be ensured even if the cross beam is made of thin plate material and the height dimension is shorter than that of conventional cross beams. In addition, since the cross beam 8 has a flat part formed on the upper part, it can support the flooring that forms the floor of the passenger compartment without any problems, and the height dimension is shorter than that of the conventional structure consisting of a cross beam and a keystone plate. It is possible to construct a thin underframe. In addition, according to the structure of the underframe, its manufacture involves sequentially arranging the cross beams 8 and joining them to each other, and also attaching the side beams 9 to each other.
The work is easy as it only needs to be joined to the Further, each of the horizontal beams 8 is placed on the rib 9a of the side beam 9 and is joined to the rib 9a by spot welding, thereby preventing deformation of the underframe due to welding heat input. , it is possible to manufacture highly accurate underframes. Further, since the cross beam 8 has an opening on the upper surface, that is, a gap is formed between the flat parts on both sides, the heat insulating material 10 can be inserted into the cross beam 8, and the installation work of the heat insulating material 10 can be carried out. can be done easily and reliably.

Next, another embodiment of the present invention shown in FIG. 4 will be described. The difference between this embodiment and the above embodiment is that the ribs 9b formed on the side beam 9 are formed by plastic working the lower flange portion of the side beam 9. In addition, in the case of this configuration, the cross beam 8
is suitable for applications where the load conditions are severe and the height dimension is increased to increase the rigidity. According to such a structure, it has the same effect as the one embodiment described above, and the weight can be reduced compared to the structure of the one embodiment described above when the height dimension of the cross beam 8 is high as described above. By the way, in the above embodiment and this embodiment, the side beam 9 and the ribs 9a, 9b formed thereon are both integrally formed, so the number of parts can be reduced and the strength is advantageous.

Next, another embodiment shown in FIGS. 5 and 6 will be described. The difference between the embodiment shown in FIG. 5 and the previous embodiment is that a cross beam support 11 having a Z-shaped cross section is provided at a position of the side beam 9 that supports the cross beam 8. That is, the cross beam support 11, which is formed into a shape corresponding to the height dimension of the cross beam 8, is connected to the inner side of the upper flange portion of the side beam 9 by mechanical joining means such as spot welding or rivets. It is. According to such a configuration, it is possible to have the same effect as the one embodiment described above, and also to install cross beams 8 having different height dimensions, and to freely combine the cross beams 8 having different height dimensions according to the weight of the underfloor equipment. can be done. Regarding the production of the side beams 9,
It has a simple configuration and is easy to manufacture, and since the cross beam receiver 11 is a separate member from the side beam 9, it can be molded into any shape to match the cross beam 8.

Next, the difference between the embodiment shown in FIG. 6 and the above embodiment is that, similarly to the embodiment shown in FIG. In this embodiment, the cross beam receiver 11
is provided inside the lower flange portion of the side beam 9.
According to such a configuration, the same effects as those of the embodiment shown in FIG. 5 can be obtained, and even when the height of the cross beam 8 increases, the cross beam support 11 can be made lightweight.

Next, another embodiment of the present invention shown in FIG. 7 will be described. In the same figure, the difference from the above embodiment is that the side beam 9 has almost the same structure as the conventional structure, and an inner side beam 12 that fits therein is joined. A rib 12a for supporting and joining the cross beam 8 is formed on the inner side of the side inner beam 12. According to such a configuration, by applying it to a portion of the side beam 9 that is considered to have severe strength, it is possible to partially improve the strength of the side beam 9, and since it serves as a support member for the cross beam 8, the reinforcing member There is no need to provide a special one, and as a result, the weight of the entire underframe can be reduced.

Next, another embodiment of the present invention shown in FIG. 8 will be described. In the figure, the difference from the previous embodiment is that the side beam 9 has a box-shaped cross section in order to have a structure that also serves as a long base in terms of strength. Since the side beams 9 have a box-shaped cross section, they are strong and the long door stand 13 can be made thin and lightweight. Therefore, the overall weight of the structure can be reduced.

〔Effect of the invention〕

As explained above, according to the present invention, cross beams formed in a box-shaped cross section are joined adjacently and installed between the side beams, thereby forming an underframe consisting of a conventional cross beam and a keystone plate installed on the cross beams. Compared to this, it is possible to construct a thinner underframe while ensuring strength. Furthermore, since the cross beams are placed on the ribs of the side beams and joined by spot welding, deformation of the underframe due to welding heat input can be minimized.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the underframe according to the present invention, FIG. 2 is a sectional view taken along the line C-C in FIG. 1, FIG. 8 to 8 are cross-sectional views of the same parts as FIG. 3 showing other embodiments of the underframe according to the present invention, FIG. 9 is a plan view showing a conventional underframe, and FIG. 10 is the same part as FIG. 11 is a sectional view taken along line AA, and FIG. 11 is a sectional view taken along line BB in FIG. 1... Underframe, 5... Pillow beam, 6... End beam, 7...
Middle beam, 8... horizontal beam, 9... side beam.

Claims (1)

[Scope of Claims] 1. Side beams that are placed on both sides of the underframe in the width direction so as to extend in the longitudinal direction of the vehicle body, and a side beam that is placed in the width direction of the underframe in correspondence with the position where the bogie is installed between each of the side beams. a cross beam that is arranged between the side beams and connected to the side beams at each end; and a cross beam that is arranged between the side beams and extends in the width direction of the underframe between the pillow beams and connects each end to the side beams. In the underframe structure for a railway vehicle, the cross beam has a rectangular cross-sectional shape in the width direction, has a flat part with an opening at the upper part, and has a flat part on both sides that runs perpendicular to the upper flat face. each of the side beams has a flange portion on the central side surface in the width direction of each underframe, on which an end portion of the cross beam is placed and supported; The cross beams are arranged between the side beams and between the pillow supports, and the cross beams are arranged adjacent to each other in the longitudinal direction of the vehicle body, and their respective side plane parts are joined to each other by spot welding, and each end of each cross beam is An underframe structure for a railway vehicle, characterized in that the underframe structure is mounted on the flange portion of a side beam and joined by spot welding.