JPH11321636A - Bogie frame of magnetic levitation type railway vehicle - Google Patents

Abstract

(57) [Problem] To provide a bogie frame for a magnetically levitated railway vehicle that is lightweight, has excellent durability, is inexpensive, is suitable for mass production, has low generated stress, and has high buckling strength. SOLUTION: The bogie frame 1 for a magnetically levitated railway vehicle according to the present invention has two side beams 2, end beams 3, and cross beams 4 made of a non-magnetic material and a light alloy which is press-formed into a U-shaped cross section. At the same time, the plates are abutted against each other,
The backing B covering the entire opening surface is interposed, and the butted end face and the backing B are integrally welded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic levitation type railway vehicle that floats with a superconducting coil during high-speed running and runs on supporting wheels when stopped or running at low speed. The present invention relates to a bogie frame which can be maintained at a high price and can be mass-produced at low cost.

[0002]

2. Description of the Related Art A bogie of a magnetic levitation type railway vehicle generates a levitation force on a vehicle by a magnetic force generated between a magnet mounted on the trolley and a coil installed on a track, and the self-weight of the vehicle is reduced by the levitation force. First, weight reduction is required for support.

Further, in order to maintain the superconducting state of the superconducting coil mounted on the vehicle, it is necessary to maintain the superconducting state at a very low temperature (absolute temperature 4 degrees) by the liquid helium temperature.
When the superconducting coil is vibrated by vibration or external force during traveling, an eddy current is generated, thereby generating heat and causing a quench phenomenon in which the superconducting state is destroyed. In order to prevent the vibration of the coil which causes the quench phenomenon, the bogie frame for fixing the coil needs to have sufficient rigidity.

[0004] The loads received by the bogie frame include: (1) the vertical load of the vehicle body weight (load on the bogie frame via an air spring) (2) the support leg brake during running of the support wheels (front-rear load) (3) Guide force when running on guide wheels (lateral load) (4) There are propulsive force and guide force (force before and after and on the superconducting coil) during levitation, and these loads are applied to the vehicle body via air springs. At the same time, it is necessary to reduce the stress generated in the bogie frame itself and make it durable. In addition, since a thin plate is used for a beam constituting the bogie frame for weight reduction, a design that does not cause buckling deformation is required.

Therefore, Japanese Patent Publication No. Hei 7-110606 and Japanese Patent Publication No. Hei 7-110607 propose a bogie frame used for side beams, cross beams, and end beams in which an aluminum alloy honeycomb panel is assembled in a box-shaped cross section. In addition, this bogie frame also uses an aluminum alloy honeycomb panel as a base material for a bracket for supporting an air spring.

[0006]

However, Japanese Patent Publication No. 7-110606 and Japanese Patent Publication No.
The bogie frame having a honeycomb structure proposed in No. 07 has many welds, which is disadvantageous for durability in terms of strength.

The present invention has been made in order to solve the above-mentioned problems, and is a magnetic levitation railway which is lightweight, has excellent durability, is inexpensive, is suitable for mass production, has a small generated stress, and has a high buckling strength. An object is to provide a bogie frame for a vehicle.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a non-magnetic, light alloy, two sheets of a side beam, an end beam, and a cross beam, which are press-formed into a U-shaped cross section. Are arranged such that their opening surfaces are butted together, a backing covering the entire opening surface is interposed between the butted end surfaces, and this butted end surface and the backing are integrally welded. By doing so, the weight can be reduced and the strength can be improved.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A bogie frame for levitating a vehicle with a superconducting coil is required to satisfy the following conditions. (1) Since the levitation force of the superconducting coil is used, the bogie frame itself should be as light as possible and the levitation force can be used to support the weight of the vehicle body and passengers. (2) The superconducting coil must have sufficient rigidity to prevent quench. (3) From the viewpoint of shortening the processing steps and saving the trouble of quality inspection, the number of welded parts should be reduced as much as possible. (4) The structure must be inexpensive in terms of manufacturing and can be mass-produced. (5) The trolley frame itself is made of a non-magnetic material, and is made of a material that does not receive an attractive force from these coils, because the trolley frame itself is made of a non-magnetic material because it floats and propells by the magnetic force between the ground side coil and the vehicle side coil.

Therefore, the bogie frame of the magnetic levitation type railway vehicle according to the present invention is a non-magnetic material in which side beams, end beams, and cross beams are press-formed into a U-shaped cross section and made of a light alloy such as an aluminum alloy. The plates are abutted against each other, a backing covering the entire opening is interposed between the abutting end surfaces, and the abutting end surface and the backing are integrally welded. By constructing the bogie frame using the side beams, end beams, and cross beams configured as described above, the weight and rigidity can be reduced, the number of welding points can be reduced, and the coil receives an attractive force. In addition, mass production is possible at low cost.

[0011] Further, it is desired that a vehicle levitated by a superconducting coil has low stress generated under various loads and has sufficient durability. Particularly, air spring load, support leg load, and guide leg load are required. Because it concentrates on the applicable part of
A structure for reducing the stress applied to these portions is required.

Therefore, in the bogie frame for a magnetically levitated railway vehicle according to the present invention, in the above configuration, the bracket member for installing the support leg device and the guide leg device is formed by an integrated cutout member provided with a bracket. The shaved member was welded and fixed at a predetermined position in the beam. By doing so, it is possible to reduce the stress applied to the brackets of the guide wheels and the support wheels where the load is concentrated.

Further, since it is necessary to reduce the weight of the vehicle to be levitated by the superconducting coil, the basic structure of the side beams, end beams, and cross beams that constitute the bogie frame is inevitably a hollow structure.
The outer wall has a thin-walled structure, and it is necessary to maintain strength so that buckling deformation does not occur in the wall portion of the beam near where the load is concentrated.

Therefore, in the bogie frame of the magnetically levitated railway vehicle according to the present invention, in the above configuration, an intermediate member having a smoothly changed plate thickness is interposed between the cutout member and the beam. By doing so, it is possible to prevent buckling deformation due to the load applied to the side beams and the end beams having the thin structure for the purpose of weight reduction, and to smoothly disperse the load.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a bogie frame of a magnetically levitated railway vehicle according to the present invention will be described below with reference to FIGS. FIG.
1 shows a schematic configuration of a vehicle using a bogie frame (hereinafter abbreviated as a bogie frame) of a magnetically levitated railway vehicle of the present invention. FIG. 2 shows the structure of the bogie frame of the present invention. FIG. 3 shows an example in which a U-shaped press member is used for the side beam. FIG. 4 shows a manufacturing process of the U-shaped press member. FIG. 5 shows the periphery of the support leg and the bracket member. FIG. 6 shows the vicinity of the joint between the side beam and the cross beam. FIG.
Indicates an R portion of the support leg bracket and a portion where the plate thickness is changed.

The bogie frame 1 of the present invention comprises side beams 2 and 2, end beams 3 and 3 provided between the side beams 2 and 2, and side beams at positions between the front and rear end beams 3 and 3. It comprises horizontal beams 4, 4 provided between the beams 2, 2, and posts 5, 5 provided above the end beams 3, 3 and supporting an air spring 7, which will be described later. The side beams 2 and 2, the end beams 3 and 3, and the cross beams 4 and 4 are formed by pressing a thin plate made of, for example, an aluminum alloy into a U-shaped cross section.
The opening surfaces of the mold press members A, A are abutted, and a backing B that covers the opening surface is interposed on the abutting end surface.

As shown in FIG. 4, the U-shaped press member A of the bogie frame 1, for example, the side beam 2, is formed of an aluminum alloy plate having a superconducting coil mounting seat 2b or the like formed at a predetermined position. It is obtained by pressing upward from the center lower part of the interval (FIG. 4B), and then pressing downward from the center upper part of the predetermined interval (FIG. 4C).

Thereafter, the openings of the U-shaped press members A, A are butted, and as shown in FIG. Side beam 2, end beam 3, and cross beam 4 are obtained.

The vehicle T equipped with the bogie frame 1 is
A superconducting coil 6 is provided on a side surface of the bogie frame 1, and the bogie frame 1
Is provided with a cooling tank 6a in which a cooling medium for the superconducting coil 6 is stored.

Further, the vehicle T has an air spring 7 supported on the post 5 and a laterally protruding side of the vehicle T on one of the front and rear surfaces of the post 5 in the traveling direction. A guide wheel 8 for guiding is provided via a guide leg 8a. A bracket 10a is attached to one surface of the post 5 in the front-rear direction in the traveling direction. The bracket 10a is used for supporting and elevating the support wheel 9 which descends from above and comes into contact with the track R when stopped or running at low speed. The tip of the support leg 10 is pivotally supported.

The supporting leg 10 is, for example, a cylinder device as shown in FIG.
Bracket 10 standing upright and attached to post 5
a is pivotally supported, and its base end is pivotally supported by a trailing arm 11 which pivotally supports the axis of the support wheel 9 at one end thereof. The trailing arm 11 has one end pivotally supporting the axis of the support wheel 9 as described above, and the other end thereof has a pin P on brackets 12a and 13a of bracket members 12 and 13 to be described later.
It is pivoted at. The support wheel 9 is provided with the support leg 1 as needed.
When the 0 is driven, it moves in the direction of the arrow shown in FIG.

Here, the side beam 2 and the end beam 3 of the bogie frame 1 are
In order to reduce the weight, a thin plate is used. However, when the support leg 10 comes into contact with the track R, the load concentrates on the mounting portion of the support leg 10 and the bogie frame 1 is buckled and deformed.
For example, the structure is as shown in FIGS.

Numerals 12 and 13 denote bracket members, each of which is formed of an integrally cut material as shown in FIG. 6, and has brackets 12a and 13a provided on one side surface. These bracket members 12 and 13 are welded and fixed to predetermined positions of the end beams 3 and the side beams 2, and these bracket members 12 and 13 form part of the end beams 3 and the side beams 2. In this embodiment, a thick intermediate member 14 is interposed between the bracket members 12 and 13 and the end beams 3 and the side beams 2, and the intermediate members 14 are used for the bracket members 12 and 13 and the end beams 3 and the side beams 2. The change in wall thickness is smoothly shifted.

By interposing the intermediate member 14, the load acting on the end beam 3 and the side beam 2 from the support wheel 9 can be efficiently dispersed. By doing so, the bogie frame 1 can be further improved in strength.

Next, the operation of the bogie frame 1 of the present invention will be described. The side beam 2, end beam 3, and cross beam 4 of the bogie frame 1 are box-shaped hollow inside and are welded after the backing B is interposed at the abutting open surface, so that they are lightweight and maintain high strength. And two welds are required as compared with a case where four flat plates are bonded and welded at four places. Therefore, the time required for the inspection can be shortened and the quality can be improved because the cost is low, the labor is small, and the number of welds is small.

Loads act on the following parts of the bogie frame 1. That is, the weight of the vehicle body is applied to the support post 5 for supporting the air spring 7, and the reaction force is applied to the bracket members 12 and 13.
The braking force of the support wheel 9 is reduced by the bracket members 12 and 13.
In addition, the lateral force of the guide wheel acts on the guide wheel bracket (not shown), and the propulsion force and the guide force during floating act on the side beam 2 which is the superconducting coil mounting portion.

In particular, since the support leg 10 has a telescopic structure that can be lifted and stored when flying, as in the case of an airplane, the bracket members 12 and 13 have only vertical directions as shown in FIGS. 7 (a) and 7 (b). However, a load in the front-rear direction is applied, so that not only a tensile force and a compressive force but also a bending moment is generated, a large load is applied to the bracket members 12 and 13 themselves, and the bogie frame 1 (the side beams 2 and the end The manner in which the load is applied also changes greatly depending on the attachment to the beam 3).

Therefore, the mounting portions of the brackets 12a and 13a are the bracket member 1 formed of a cut-out member.
2 and 13 are welded and integrated with the end beams 3 and the side beams 2, and the stress generated in the bracket members 12 and 13 is applied to the back side of the end beams 3 and the side beams 2, that is, the outer wall opposite to the mounting surface of the support wheel 9. It was also decentralized so that it could be communicated directly. With this configuration, the stress can be more efficiently dispersed, and the plate thicknesses t1 to t6 and the R portions R1 to R5 in FIGS. 7A and 7B can be freely changed, and optimization can be appropriately performed. It becomes possible to plan. In addition, since the extra thickness of the portion where the stress is small can be eliminated, the weight can be further reduced. This configuration is also used for the guide wheel 8.

As described above, in the bogie frame 1 of the present invention, the side beams 2, the end beams 3, and the cross beams 4, which are the basic structures of the bogie frame 1, are made of a thin material, and are appropriately formed of a cut-out member. By adopting the structure, the strength of each structure is improved, so that the load can be widely distributed and borne over the entire bogie frame 1, and both the strength and the weight can be achieved.

Further, the bogie frame 1 of the present invention is designed so that the end beams 3 and the side beams 2 to which the bracket members 12 and 13 are welded as described above do not suddenly become a thin portion from a thick portion. By interposing the intermediate member 14, the load could be more smoothly dispersed. In this configuration, as shown in FIG. 6, the entire middle part of the intermediate member 14 may not be thick, and at least the bracket member 1
It is sufficient that only the portion where the first and second beams 13 and 13 are welded to the end beam 3 and the side beam 2 has a large thickness, and the other portions have a structure in which the thickness is smoothly changed to be thin.

That is, the bogie frame 1 of the present invention comprises the side beams 2,
Since the end beams 3 and the cross beams 4 are basically made of a thin material, even in a state where the generated stress is low and there is no problem in durability, the resistance to the buckling deformation is increased in a portion where a compressive load is applied. Thickening is important because it is necessary to design. Therefore, by adopting the configuration of the present invention as described above, it is possible to increase resistance to buckling deformation while keeping the weight reduced.

The relationship between the buckling load and the side beam 2, the end beam 3, and the cross beam 4 usually has the following relationship, and is used in designing a portion under relatively simple conditions. You.

[0033]

(Equation 1)

[0034]

As described above, the bogie frame of the magnetically levitated railway vehicle according to the present invention is such that the side beams, end beams and cross beams are made of a non-magnetic material and a light alloy which is press-formed into a U-shaped cross section. Since the plates were butted against each other, a backing covering the entire opening face was interposed between the butted end faces, and the butted end face and the backing were integrally welded.
The weight can be reduced by using a thin material, and the number of welding lines can be reduced, so that the work of welding inspection can be shortened. Further, the number of processing steps is reduced, so that mass production can be performed at low cost.

In the bogie frame for a magnetically levitated railway vehicle according to the present invention, the bracket member for installing the support leg device and the guide leg device is formed by an integrated cutout member having a bracket. Since the cut-out member is welded and fixed to a predetermined position in the beam, external loads and applied stress can be reduced and the load can be dispersed.

Further, the bogie frame of the magnetically levitated railway vehicle according to the present invention, in the above-described configuration, comprises
Since an intermediate member with a smoothly changed plate thickness was interposed,
As compared with the above, the external load and stress can be further reduced and the load can be dispersed, and buckling deformation can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a vehicle employing a bogie frame of a magnetically levitated railway vehicle according to the present invention.

FIG. 2 shows a bogie frame of a magnetically levitated railway vehicle according to the present invention;
(A) is a plan view, (b) is a front view, and (c) is a view seen from the left side direction of (a).

FIG. 3 shows an example of a side beam structure in a bogie frame of a magnetically levitated railway vehicle according to the present invention, wherein (a) is a left side view,
(B) is a front view.

FIGS. 4 (a) to 4 (d) are diagrams sequentially illustrating a process of manufacturing a U-shaped press member in a bogie frame of a magnetically levitated railway vehicle according to the present invention.

FIG. 5 is a front view showing a mounting structure of an end beam of a bogie frame and a bracket member of a support wheel of the magnetically levitated railway vehicle of the present invention.

FIG. 6 is a plan view showing the mounting structure of the end beams and side beams of the bogie frame of the magnetically levitated railway vehicle of the present invention and the bracket member of the support wheel.

FIGS. 7A and 7B are views showing end portions of the bogie frame of the magnetic levitation type railway vehicle according to the present invention, R portions of brackets, and places where the wall thickness can be changed, FIG. 7A is a plan view, and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bogie frame (of a magnetic levitation type railway vehicle) 2 Side beam 3 End beam 4 Cross beam 5 Post (for supporting air spring) 8 Guide wheel 9 Support wheel 12 Bracket member (for support wheel) 13 Bracket member (for support wheel) 14 Intermediate member A U-shaped press member

Claims (3)

[Claims] In a bogie frame of a magnetic levitation type railway vehicle in which left and right side beams are connected by end beams and cross beams, these side beams, end beams, and cross beams are non-magnetic members press-formed into a U-shaped cross section. The two plates of light alloy are abutted against each other with their opening surfaces, and a backing covering the entire opening surface is interposed on the abutting end surface, and the abutting end surface and the backing are integrally welded. Bogie frame of a magnetically levitated railcar. 2. A bracket member for installing the support leg device and the guide leg device in the bogie frame of the magnetically levitated railway vehicle according to claim 1, wherein the bracket member is formed by an integrated cutout member provided with a bracket. The bogie frame of a magnetically levitated railcar, wherein the bogie is fixedly welded to a predetermined position in the beam. 3. The magnetic levitation of claim 2, wherein an intermediate member having a smoothly changed thickness is interposed between the cutout member and the beam in the bogie frame of the magnetic levitation railway vehicle. Bogie frame for railway cars.