JP3572941B2 - Bogie frame for railway vehicles - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a bogie frame for a railway vehicle capable of reducing stress concentration at a joint between a side beam and a cross beam and improving durability.
[0002]
[Prior art]
As shown in FIG. 5, the bogie frame of the railway vehicle has a configuration in which a central portion between a pair of side beams 11 arranged at a predetermined interval is connected by, for example, two cross beams 12, and during traveling. Bears not only vertical loads for supporting the vehicle body, but also loads such as front and rear, left and right, and torsion.
[0003]
In the bogie frame having such a configuration, when a load is transmitted between the cross beam 12 and the side beam 11 and the load is equally distributed over the entire joint portion P between the side beam 11 and the side beam 12, no stress concentration occurs. Normally, since the upper surface and the lower surface of the side beam 11 are located near the joint P between the side beam 11 and the side beam 12, even if the thickness of the side surface of the side beam 11 or the plate thickness of the side beam 12 is constant, The vicinity of the upper surface and the lower surface of the beam 11 has strength.
[0004]
As described above, when a load is applied to a structure having a non-uniform structural strength, a large load is borne at a location where the strength is large. Will be borne.
[0005]
On the other hand, even though the structural strength is different at the joint between the side beam and the cross beam, since the thickness of the side beam itself is constant, high stress is generated in accordance with the ratio of the load burden. I can say. Since the cross beam also bears an uneven reaction force, a large load is applied to the upper and lower portions near the joint between the side beam and the cross beam, and high stress is generated. Accordingly, when the load such as the front and rear, left and right twists acts on the bogie frame, stress concentration occurs near the upper and lower portions of the joint between the side beam and the cross beam.
[0006]
Therefore, in order to reduce the high stress below the fatigue limit strength of the bogie frame, conventionally, as shown in FIGS. 6 and 7, a reinforcing rib 13 is attached to a joint P between the side beam 11 and the cross beam 12, or shown in FIG. However, the nominal stress was reduced by mounting a large number of weld beads on the side beams and the cross beams, especially near the upper and lower portions, and firmly joining them.
[0007]
For the purpose of improving the strength of the bogie frame against such stress, for example, Japanese Patent Application Laid-Open No. 9-30417 discloses a brace means provided on each cradle jaw area of a light-weight side beam having a solid, open and integrated I-beam cross-sectional shape. A lightweight side beam and a bogie for a railcar bogie, which are provided with a reinforcing member to improve mechanical strength against twisting of the side beam, are disclosed.
[0008]
[Problems to be solved by the invention]
As described above, conventionally, the weld bead was piled up near the occurrence of stress concentration, or by simply adding a reinforcing member to the outer surface of the joint between the side beam and the cross beam, the structure was configured to withstand the stress. The structure of the bogie frame does not eliminate the stress concentration itself, and the stress concentration still occurs at the joint between the side beam and the cross beam.
[0009]
The present invention has been made in order to solve the above-mentioned problem, and a bogie frame for a railway vehicle capable of reducing stress concentration itself occurring near the upper and lower portions of a joint between a side beam and a cross beam. The purpose is to provide.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention does not provide vaguely the reinforcing rib provided between the upper surface and the lower surface of the side beam inside the side beam, but rather connects the reinforcing rib and the connecting portion of the side beam in the side beam. The distance from the connecting portion to the upper surface or the lower surface of the side beam is smaller than or equal to the shorter distance, so that the stress is dispersed. This alleviates the concentration of stress generated at the joint between the side beam and the cross beam.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
The bogie frame for a railway vehicle according to the present invention further includes a reinforcing rib provided between an upper surface and a lower surface of the side beam inside the side beam , wherein a distance between the reinforcing rib and a connecting portion of the side beam in the side beam is the connecting portion. It is provided so as to disperse the stress at a position which is smaller than or equal to the shorter distance of the distance from the upper side or the lower side of the side beam.
[0012]
As described above, the reinforcing rib provided between the upper surface and the lower surface of the side beam inside the side beam reduces the structural strength unevenness by approaching the joint, and the upper part of the joint between the side beam and the cross beam is provided. The load that has been borne by having a large strength at the lower portion can be made closer to a uniform state, thereby alleviating the stress concentration on the structure.
[0013]
In the bogie frame for a railway vehicle according to the present invention, the shape of the reinforcing rib may be a curved shape that is concentric with a cross beam, or a shorter one of the distances from the coupling portion to the upper surface or the lower surface of the side beam. When a plurality of the reinforcing ribs are provided at positions less than the distance, the generated stress can be further reduced.
[001 4 ]
【Example】
Hereinafter, an embodiment of a bogie frame for a railway vehicle (hereinafter abbreviated as a bogie frame) of the present invention will be described with reference to FIGS. FIG. 1 shows an arrangement relationship between side beams, cross beams, and reinforcing ribs in the bogie frame of the present invention. FIG. 2 shows a model around the joint between the side beam, the cross beam, and the reinforcing rib in the bogie frame of the present invention. FIG. 3 shows stress calculation locations in the vicinity of the joint portion of the bogie frame by an experiment. FIG. 4 is a graph showing the calculation results in FIG.
[001 5 ]
As shown in FIGS. 1 and 2, the bogie frame 1 of the present invention includes reinforcing ribs 4 provided on both sides of the side beam 2 at the joint P between the side beam 2 and the side beam 3 to connect the side beam 2 and the side beam 3. It is provided at a position that is equal to or shorter than the shorter distance L1 of the distance from the portion P to the upper surface or the lower surface of the side beam 2.
[001 6 ]
When the reinforcing ribs 4 are provided at such positions, the load is borne by the entire joint P, so that the generated stress is balanced. In addition, the bogie frame 1 of the present invention not only brings the reinforcing ribs 4 closer to the joint portion P, but also makes the reinforcing ribs 4 have a curved shape concentric with the cross beam 3 or a plurality of reinforcing ribs 4 under the above conditions. By providing such a structure, the generated stress can be further reduced.
[001 7 ]
Incidentally, a model around the joint between the side beam 2, the cross beam 3, and the reinforcing rib 4 of the bogie frame 1 of the present invention shown in FIG. 2 and the side beam 11, the horizontal beam 12, and the reinforcing rib of the conventional bogie frame shown in FIG. The result of calculation under the following conditions is shown below with respect to the model around the joint portion with No.
[0018]
For example, the side beams 2 and 11 of FIGS. 2 and 7 are 300 mm wide × 300 mm high × 15 mm thick, the horizontal beams 3 and 12 are 150 mm outside diameter × 15 mm thick, and both are made of the same material. in the present invention L1 is provided a reinforcing rib 4 to L2 is 142.5Mm position (L2 ≦ L1) when the 142.5Mm, is Lb when La is 142.5Mm in the conventional example of FIG. 7 172.5mm The reinforcing ribs 13 are provided at the positions (La <Lb) where the side beams 2 and 11 are fixed, and a torsional load of 1000 kgf / mm is applied to the cross beams 3 and 12 so that the connecting portions P are formed as shown in FIG. At A, B, C, and D were calculated.
[001 9 ]
As a result of the calculation, in the conventional bogie frame shown in FIG. 7, as shown by the broken lines in FIG. 4, considerably high stress was generated mainly at two points A and C of the joint P. On the other hand, in the bogie frame 1 of the present invention shown in FIG. 2, as shown by the solid line in FIG. The generated stress of A and C of P is lower than that of the conventional one, and the generated stress itself is averaged as a whole of A, B, C and D of the joint portion P, and is lower than that of the conventional one. Was done.
[00 20 ]
As is clear from the above calculation, as in the present invention, the reinforcing rib 4 is connected to the shorter distance L1 of the distance from the joint P between the side beam 2 and the cross beam 3 to the upper surface or the lower surface of the side beam 2. If provided at the same or shorter distance L2, that is, L2 ≦ L1, the stress that the upper and lower portions of the joint P excessively bear is dispersed, and the stress concentration can be reduced. .
[0021]
【The invention's effect】
As described above, the bogie frame for a railway vehicle of the present invention includes a reinforcing rib provided between the upper surface and the lower surface of the side beam inside the side beam, the reinforcing rib being provided between the reinforcing rib and a connecting portion of the cross beam in the side beam. Since the distance is provided at a position that is equal to or less than the shorter distance of the distance from the joint to the upper surface or the lower surface of the side beam, stress concentration at the joint between the side beam and the cross beam is reduced, and the side beam and the cross beam The stress concentration itself generated near the upper and lower portions of the joint can be reduced, and the durability can be improved.
[Brief description of the drawings]
FIG. 1 is a view showing an arrangement relationship among side beams, cross beams, and reinforcing ribs in a bogie frame for a railway vehicle according to the present invention.
FIG. 2 is a diagram showing an arrangement model of side beams, cross beams, and reinforcing ribs in the bogie frame for a railway vehicle according to the present invention.
FIG. 3 is a diagram showing stress calculation locations at joints between side beams, cross beams, and reinforcing ribs by experiments.
FIG. 4 is a diagram showing a result of stress calculation at a joint between a side beam, a cross beam, and a reinforcing rib.
FIG. 5 is a diagram showing a schematic configuration of a conventional bogie frame for a railway vehicle.
FIG. 6 is a diagram showing an arrangement relationship between side beams, cross beams, and reinforcing ribs in a conventional bogie frame for a railway vehicle.
FIG. 7 is a diagram showing an arrangement model of side beams, cross beams, and reinforcing ribs in a conventional bogie frame for a railway vehicle.
[Explanation of symbols]
Reference Signs List 1 (railroad vehicle) bogie frame 2 side beam 3 side beam 4 reinforcing rib P connecting part L1 The distance L2 which is the same as or closer to the shorter distance L2 L1 from the connecting part between the side beam and the cross beam to the upper surface or lower surface of the side beam

Claims (3)

In a bogie frame for a railway vehicle in which the side beams are connected by a cross beam, a reinforcing rib provided between an upper surface and a lower surface of the side beam inside the side beam is provided between the reinforcing rib and a connecting portion of the cross beam in the side beam. A bogie frame for a railway vehicle , wherein stress is dispersed at a position where a distance is equal to or less than a shorter distance from a distance from the coupling portion to an upper surface or a lower surface of the side beam. The bogie frame for a railway vehicle according to claim 1, wherein the shape of the reinforcing rib is a curved shape concentric with the cross beam. 2. The bogie frame for a railway vehicle according to claim 1, wherein a plurality of the reinforcing ribs are provided at a position which is shorter than or equal to a shorter distance from a distance from the coupling portion to an upper surface or a lower surface of the side beam. 3.

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